Science topic

Nutrient Management - Science topic

Explore the latest questions and answers in Nutrient Management, and find Nutrient Management experts.
Questions related to Nutrient Management
  • asked a question related to Nutrient Management
Question
3 answers
What role do machine learning algorithms play in optimizing irrigation and nutrient management for millet crops?
Relevant answer
Answer
Machine learning algorithms plays a significant role in precise resource optimization like irrigation water and nutrient management. Based on the real time data, the decision making is made easy by predicting the need and subsequently supplying it the precise requirements. Irrigation scheduling could be done based on available wheather parameters, sensor based precised data on soil water and the crop water requirements for millets at a particular period. All these calculations can be automated using machines. Real time based moisture content of the plant and temperature of it can also be included in the algorithm as an input. By combining all this the actual amount needed can be calculated and applied accordingly which optimize the over or under use of water resources.
  • asked a question related to Nutrient Management
Question
1 answer
What is the significance of using this approach from the point view of improving agricultural productivity, soil health, and environmental quality?
Relevant answer
Answer
Integrated Nutrient Management (INM) is the strategic use of chemical fertilizers, organic manures (like compost, green manure) and biofertilizers to maintain soil fertility and optimize crop productivity sustainably.
Significance:
  • Enhances soil health by improving structure, microbial activity and nutrient balance.
  • Reduces dependence on chemical fertilizers, lowering input costs and pollution.
  • Improves nutrient use efficiency, minimizing losses and increasing yield.
  • Promotes sustainable agriculture by balancing productivity with environmental protection.
  • asked a question related to Nutrient Management
Question
4 answers
How can agroecological practices such as diversified cropping systems, integrated nutrient management, and ecological pest control transform the intensive cereal-based farming of the Indo-Gangetic Plains towards achieving sustainable and nutritious food production?
Relevant answer
Answer
Agroecological practices can transform the intensive cereal-based farming of the Indo-Gangetic Plains (IGP) towards sustainable and nutritious food production in several key ways:
  1. Diversification of Crops: By integrating multiple crops (legumes, vegetables, fruits) alongside cereals, agroecology reduces dependency on monocultures, enhances soil health and improves biodiversity. This leads to more nutrient-dense food production and reduces the risk of pest outbreaks.
  2. Soil Health Improvement: Agroecology emphasizes organic fertilizers (compost, manure) and crop rotation, which enhances soil fertility and structure. Practices like green manuring and cover cropping help sequester carbon, improve water retention and reduce soil erosion, increasing productivity sustainably.
  3. Reduced Chemical Inputs: By minimizing or eliminating the use of chemical pesticides and synthetic fertilizers, agroecological practices decrease environmental pollution, enhance soil microorganisms and reduce the health risks associated with chemical residues in food.
  4. Water Management: Agroecological systems promote rainwater harvesting, drip irrigation and conservation tillage, which improve water-use efficiency and ensure the availability of clean water, crucial for the IGP's water-scarce regions.
  5. Climate Resilience: Agroecology adapts to climate variability by creating diverse farming systems that are more resilient to droughts, floods and temperature extremes. This ensures consistent and nutritious food production, even under changing climate conditions.
  6. Integration of Livestock and Agroforestry: Introducing integrated livestock systems and agroforestry provides nutrient cycling, increases farm income, and supports soil fertility, while enhancing food security and dietary diversity.
  7. Farmer Empowerment and Knowledge Sharing: Agroecological practices promote local knowledge and participatory decision-making, enabling farmers to actively engage in sustainable farming practices, improving both their economic stability and food security.
  • asked a question related to Nutrient Management
Question
1 answer
How effective are the recommended package of practices (including improved seed varieties, optimal sowing time, nutrient management, and integrated pest management) in enhancing the yield and profitability of major oilseeds and pulse crops across different agro-climatic zones of India?
Relevant answer
Answer
The recommended package of practices (PoPs) for major oilseeds and pulse crops in the agro-climatic zones (ACZs) of India have proven to be highly effective in enhancing both yield and profitability. These practices are tailored to specific regional agro-ecological conditions and include optimized sowing times, high-yielding and stress-tolerant varieties, balanced fertilization, integrated pest and disease management, and improved irrigation and weed control techniques. Adoption of PoPs has resulted in substantial yield gains often 20–40% higher than traditional methods—and improved input use efficiency, leading to better returns on investment for farmers. Additionally, the integration of PoPs with extension services and farmer training has further strengthened their impact, making them a key strategy for increasing productivity and income in India’s diverse agricultural zones.
  • asked a question related to Nutrient Management
Question
1 answer
How can Site-Specific Nutrient Management be incorporated into broader CSA strategies to contribute to greenhouse gas mitigation, improved nitrogen use efficiency, and enhanced soil carbon sequestration, and what role should policymakers and investors play in mainstreaming these co-benefits at regional and national levels?
Relevant answer
Answer
Site-Specific Nutrient Management (SSNM) can be effectively integrated into broader Climate-Smart Agriculture (CSA) strategies by tailoring fertilizer application to crop needs, soil conditions, and local climate, thereby optimizing nutrient use efficiency (NUE) and reducing greenhouse gas (GHG) emissions, particularly nitrous oxide. By minimizing over-application of nitrogen and promoting balanced nutrient inputs, SSNM reduces losses to the environment while sustaining yields. When combined with CSA practices like conservation tillage, cover cropping, and diversified rotations, SSNM also supports enhanced soil organic carbon sequestration through improved root biomass and residue management. This integrated approach not only mitigates GHG emissions but also builds long-term soil health and resilience against climate variability.
  • asked a question related to Nutrient Management
Question
3 answers
Much has been discussed about precise nutrient management. I’m curious, how is GreenSeeker-based nitrogen fertilizer applied in rice? How much nitrogen is determined based on the NDVI values observed, and is there a standard protocol followed for this approach?
Relevant answer
Answer
The GreenSeeker device is used to measure the NDVI (Normalized Difference Vegetation Index), which reflects plant health and vigor. In rice cultivation, nitrogen fertilizer recommendation is calculated using a process that links NDVI values to the crop’s nitrogen needs through the following steps:
1. Measure NDVI at a specific growth stage, such as tillering or before panicle initiation.
2.Compare the field NDVI with the NDVI of a control strip, where sufficient nitrogen has been applied (this is called the nitrogen-rich strip).
3. Calculate the difference or ratio between the field NDVI and the control NDVI.
4. Insert the values into a calibrated formula, which accounts for NDVI values, the crop stage, and previously applied nitrogen.
5.The result gives the recommended nitrogen dose to apply.
This method helps avoid over-fertilization, reduce costs, and improve nitrogen use efficiency.
  • asked a question related to Nutrient Management
Question
3 answers
How can precision nutrient management techniques, such as site-specific nutrient application and remote sensing technologies, help optimize fertilizer use efficiency, reduce environmental pollution, and enhance farmers' income in diverse cropping systems?
Relevant answer
Answer
Precise management of nutrient addition requires knowledge about the soil fertility status at the site, the crop rotation, and the type of crops to be grown, in addition to the presence of a smart and precise irrigation method. Accordingly, a sound strategy can be developed in terms of selecting the type of mineral, organic, and biological fertilizers to achieve integrated fertilization management and linking them to the plant's life stages, as well as choosing the appropriate doses and time for addition in the appropriate manner.
  • asked a question related to Nutrient Management
Question
1 answer
What are the major challenges and opportunities associated with implementing precision nutrient management strategies in different agro-climatic regions, and how can policymakers and agricultural extension services support farmers in overcoming these barriers?
Relevant answer
Answer
I think that Major Challenges:
  1. Soil and climate variability: Differences in soil properties and climatic conditions make it difficult to apply a one-size-fits-all nutrient strategy.
  2. Lack of data: Limited access to accurate data on crop needs and local environmental conditions hinders precise decision-making.
  3. High cost of technology: The equipment and software required for precision agriculture can be expensive, especially for farmers in developing countries.
  4. Lack of awareness and training: Some farmers are not familiar with or trained in the use of precision nutrient technologies.
  5. Poor infrastructure: Weak internet connectivity and limited technical support in rural areas can be barriers.
Opportunities:
  1. Improved fertilizer efficiency: Better targeting of nutrient application reduces costs and environmental pollution.
  2. Higher crop productivity: Crops receive nutrients according to their exact needs, boosting yields.
  3. Data-driven decision making: Farmers can use data analysis for better planning and resource management.
  4. Sustainable agriculture: Precision nutrient use supports soil health and reduces waste.
  5. Scalability: With more data and experience, strategies can be adapted across different regions over time.
  • asked a question related to Nutrient Management
Question
2 answers
How can precision nutrient management be integrated with sustainable farming practices, such as conservation agriculture and organic farming, to improve soil health, increase crop yields, and enhance farmers' income while ensuring long-term environmental sustainability?
Relevant answer
Answer
I think that the Precision nutrient management can be integrated with sustainable farming practices to improve soil health and increase crop yields through the following steps:
  1. Accurate soil analysis: Using technologies such as geographic analysis and sensors to determine the exact nutrient needs of the soil, preventing over- or under-fertilization.
  2. Targeted fertilization: Applying the right amount of fertilizer at the right time and place based on plant needs, which reduces waste and enhances nutrient uptake.
  3. Using natural nutrient sources: Such as organic fertilizers, cover crops, and crop rotation, which naturally enhance soil fertility.
  4. Reducing chemical fertilizer use: Which helps minimize pollution and prevents the buildup of harmful salts and substances in the soil.
  5. Smart farming technologies: Utilizing modern irrigation systems, drones, and sensors to monitor plant growth and nutrient levels with precision.
  • asked a question related to Nutrient Management
Question
1 answer
What role do innovative digital tools, such as artificial intelligence (AI), Internet of Things (IoT), and machine learning, play in improving nutrient management practices, and how can their adoption be scaled up among smallholder farmers for increased productivity and profitability?
Relevant answer
Answer
Let us use a food analogy (i am a foodie) to see how innovative digital tools help improve nutrient management practices:
  • AI (Artificial Intelligence) is like having a master chef who learns from every meal they cook. This chef remembers exactly how much salt made the last dish perfect and adjusts recipes based on what worked before. In nutrient management, AI analyzes patterns in soil, weather, and crop data to make precise recommendations about fertilizer application—using just enough without waste.
  • IoT (Internet of Things) works like a network of taste-testers placed throughout your kitchen. One checks if the sauce is too acidic, another monitors the oven temperature, and another watches how the dough is rising. In agriculture, IoT sensors continuously monitor soil moisture, nutrient levels, and plant health in real-time across fields, sending alerts when conditions change.
  • Machine Learning resembles a cookbook that rewrites its recipes after each meal based on feedback. If diners loved a dish, the recipe stays; if not, it adjusts. In nutrient management, machine learning algorithms continuously improve their recommendations by analyzing which fertilizer applications produced the best yields under specific conditions.
Together, these digital tools create a "smart kitchen" for farming that reduces fertilizer waste, improves crop yields, lowers environmental impact, and saves farmers money—all by applying exactly the right nutrients, at the right time, in the right amounts.
  • asked a question related to Nutrient Management
Question
4 answers
Recently, I was honored to be invited to serve as the academic editor for a forthcoming book on phosphorus, tentatively titled "Environmental Management of Phosphorus - From Biogeochemistry to Sustainable Practice." This book aims to provide a comprehensive exploration of phosphorus management by bridging cutting-edge research with practical applications to address critical environmental challenges.
The book will delve into the fundamental processes governing phosphorus cycling in ecosystems, highlighting traditional biological and chemical pathways, such as phosphorus sorption and precipitation, while incorporating recent discoveries, including the role of inorganic nanoparticles in hydrolyzing organic phosphorus. This approach seeks to establish a modern understanding of phosphorus dynamics in both natural and engineered systems.
A key focus will be strategies to mitigate phosphorus pollution, particularly in on-site wastewater treatment. Topics will include the optimization of filter systems, the use of advanced filtration materials, and the integration of chemical and natural processes to enhance nutrient retention and prevent eutrophication. The book will also address sustainable phosphorus use in agriculture, emphasizing the balance between productivity and environmental stewardship. Strategies such as precision fertilization, soil amendments, runoff reduction techniques, and phosphorus recovery and reuse will be explored to provide actionable solutions for sustainable nutrient management.
Additionally, the book will examine advances in phosphorus analysis and environmental sensor technologies. It will highlight cutting-edge techniques for detecting and quantifying phosphorus in complex environmental matrices, including innovations in electrochemical and optical sensors for real-time monitoring of phosphorus in water, soil, and wastewater systems. The importance of precise data for effective phosphorus management and resource recovery will also be emphasized.
This book is designed to equip scientists, policymakers, and practitioners with innovative tools and knowledge to address phosphorus-related environmental challenges, paving the way for sustainable practices that benefit future generations.
If you are interested in contributing a chapter to this book, please feel free to contact me for further details.
Thank you, and I look forward to hearing from you.
Relevant answer
Answer
Congratulations for your new assignment!
May I know who is the publisher of your upcoming book?? Please email me the details at moonisadervash757@gmail.com
Best Regards,
Dr. Moonisa Aslam Dervash
  • asked a question related to Nutrient Management
Question
6 answers
Currently, Agricultural science is advanced. Unfortunately, precise nutrient management is not implemented by all the farmers, but most of the farmers are doing annual soil tests. we need crop-specific and location-specific nutrient recommendations (like STCR equation). A precise Fertilizer recommendation for crops is required.
Relevant answer
Answer
Absolutely! Agricultural science has indeed reached an advanced stage, but there's a gap between the available knowledge and its practical implementation, particularly regarding precise nutrient management in farming. While it's encouraging that many farmers are conducting annual soil tests, it's crucial to translate these tests into actionable insights that are tailored to specific crops and locations.
The Soil Test Crop Response (STCR) equation is one such tool that can provide farmers with precise recommendations for fertilizer application based on soil test results, crop type, and environmental factors. These recommendations ensure that nutrients are applied in optimal quantities and at the right time, maximizing crop yield while minimizing waste and environmental impact.
By embracing crop-specific and location-specific nutrient management strategies like the STCR equation, farmers can achieve more sustainable and efficient agricultural practices. This not only benefits their bottom line by reducing input costs and increasing yields but also contributes to environmental conservation by minimizing nutrient runoff and pollution.
Therefore, there's a clear need to prioritize the adoption of precise fertilizer recommendations in agriculture to harness the full potential of advanced agricultural science and ensure the long-term sustainability of our food production systems.
  • asked a question related to Nutrient Management
Question
2 answers
Currently, most of the fertilizer recommendations are based on crop requirements and the soil analysis value will be classified as low, medium, and high. if it is the medium recommendation and requirement are the same, otherwise a 25 % variation. how we can use plant tissue analysis data can be used for the nutrient recommendation.
Relevant answer
Answer
This method typically has the soil samples collected a year (or more) after the imagery date and tissue testing. Site-specific soil test target levels are established for each field and nutrient management plans developed to reach and maintain the target levels. Plant tissue analysis gives a much more direct measure of what the plant is using; the procedures are universally applicable (in contrast to soil testing methodology); and regular plant tissue testing enables plant nutrient status to be monitored. Precision fertilization is applying the Right Input, at the Right Amount, to the Right Place, at the Right Time, and in the Right Manner and help farmers reduce the amount of inputs they use, which can help reduce the risk of environmental pollution. Precision agriculture is the science of improving crop yields and assisting management decisions using high technology sensor and analysis tools. Precision fertilization and precision irrigation are a fertilization technology based on the comprehensive analysis of the yield data of different spatial units and multilayer data, such as soil physical and chemical properties, diseases, pests, and climate. A fertilizer recommendation is the research-based set of guidelines, or management practices, for supplying fertilizer to the crop to achieve yield and quality goals (economic) in a manner that minimizes nutrient losses to the environment. High-spatial-resolution UAS imagery enables much earlier and more cost-effective detection, diagnosis, and corrective action of agricultural management problems compared to low-resolution satellite imagery. Therefore, UAS can address the needs of farmers or other users, enabling them to make better management decisions with minimal costs and environmental impact.
  • asked a question related to Nutrient Management
Question
2 answers
Summarize the STCR approach for fertilizer recommendations in agriculture. Analyze the components of the approach and discuss its effectiveness in optimizing nutrient management for different crops.
Relevant answer
Answer
Based on soil testing results fertilizer recommendations in crops are more effective in increasing yield and quality crop production. Plants' nutrient deficiency and toxicity are not balanced in the growth and development of plants. Therefore regular soil tests and plant-tissue tests are needed to ensure improved high-yield crop productivity and high-quality crop production. Yes, analyze the components of the approach and discuss its effectiveness in optimizing nutrient management for different crops. We should study soil health and smart crop production with soil fertility management.
  • asked a question related to Nutrient Management
Question
3 answers
Hello,
I'm interested in exploring life cycle analysis for composting toilet, specifically focusing on various scenarios related to nutrient removal. Can you recommend any articles or provide suggestions that could assist me in my research?
Thank you very much
Relevant answer
Answer
Life cycle analysis is based on current and literature data as well. Which area you are gonna LCA? if it is a Life cycle environmental analysis, I'd prefer that collect data from an existing system, or use literature, or you can also use sarogate system for the analysis. Here is some software you can use for environmental analysis i,e., GaBi, SimaPro, ecoenvent etc.
  • asked a question related to Nutrient Management
Question
1 answer
Hello,
I'm interested in exploring life cycle analysis for septic tanks, specifically focusing on various scenarios related to nutrient removal. Can you recommend any articles or provide suggestions that could assist me in my research?
Thank you very much
Relevant answer
Answer
A septic system's lifespan should be anywhere from 15 to 40 years. How long the system lasts depends on a number of factors, including construction material, soil acidity, water table, maintenance practices, and several others. Concrete septic tanks have the longest lifespan out of any septic tank material. Pipes in your drain field system are usually made of PVC plastic, steel, or cast iron, which typically lasts up to 50 years if installed and maintained properly.
  • asked a question related to Nutrient Management
Question
4 answers
What is the difference between the percentage of nutrient recovery and nutrient removal achieved by the struvite precipitation technology?
Relevant answer
Answer
Recuperarea nutrienţilor se face pentru a putea fi utilizaţi ulterior în diferite domenii.
Eliminarea nutrienţilor se face pentru a-i îndepărta definitiv din probă.
  • asked a question related to Nutrient Management
Question
3 answers
Compare and contrast the nutrient management strategies for maintaining soil fertility in conventional agriculture versus organic farming. Discuss their ecological and economic implications.
Relevant answer
Answer
  • In conventional agriculture, synthetic fertilizers and chemical inputs are extensively used to provide immediate nutrient supplementation. Precision farming technologies optimize nutrient application, but this approach often leads to soil degradation, loss of biodiversity, and environmental pollution due to the overuse of chemicals. Moreover, reliance on chemical pesticides disrupts natural nutrient cycles and harms soil organisms.
  • On the contrary, organic farming inculcates sustainable practices focusing on soil health. It promotes the enrichment of soil organic matter through composting, cover cropping, and crop rotations. Natural fertilizers like compost and manure, releasing nutrients slowly, enhance soil fertility without risking chemical runoff. Additionally, organic farming emphasizes biological pest control methods and polyculture, maintaining a natural balance of nutrients and biodiversity. Although nutrient release is gradual, organic farming ensures long-term soil fertility, environmental sustainability, and minimal impact on ecosystems. The choice between these approaches hinges on farmers' goals, environmental concerns, and the commitment to sustainable farming practices.
  • asked a question related to Nutrient Management
Question
5 answers
Why do leaves get burn after receiving foliar nitrogen application?
Relevant answer
Answer
Mainly Urea or other source of N fertilizer like NaNO3, (NH4)2SO4, UAN has been used for foliar N-application due to its quick absorption resulting in high recoveries of the applied N-fertilizer. Urea being small & neutral molecules with high solubility, it rapidly penetrates the leaf cuticle by lipophilic and stomatal pathways. Inside the leaf, urea hydrolysis is catalyzed by urease, an enzyme that is present in the plant tissues. A very small part of the foliar applied urea hydrolyzed to ammonia & CO2. The scorching appeared as chlorosis of the leaf tip, where NH4+ accumulation is driven by the transpiration stream.
In short, we can say that leaf scorching is promoted by NH4+ accumulation due to a limitation in N assimilation capacity (lack of balance in N uptake & assimilation).
  • asked a question related to Nutrient Management
Question
1 answer
i need research papers related to weather forecasting in managing chemical spray or nutrient management in crops ?
Relevant answer
Answer
@ Abhishek, the attached files may be useful to you.
  • asked a question related to Nutrient Management
Question
5 answers
What are the best practices for nutrient management in different cropping systems, and how can fertilizer use efficiency be improved?
Relevant answer
Answer
You may use the Internet of things (IoT) for managing various issues such as fertilization. check articles like
  • asked a question related to Nutrient Management
Question
3 answers
It is said that lava contains many valuable plant nutrients and plants grow particularly well on solidified lava. Lava is also a particularly fertile soil for plant growth.
Relevant answer
Answer
The use of lava pumice for horticulture is limited based on its serious deficiency in essential Calcium. In addition it is quite high in Potassium and Magnesium which make Calcium availability worse. I was mandated to use lava pumice in Hawaii ginger production systems but upon its poor performance made it use untenable. Another problem is these materials are too dense for container plantings. Not everything that is available has competitive usage qualities. The availability of minerals from pumic materials are also low.
  • asked a question related to Nutrient Management
Question
10 answers
Hello everyone,
I am growing tomatoes plants in greenhouse on an inert substrate consisted of only perlite.
I would like to apply potassium K stress and thus I would like to use Hoagland nutrient solution.
As the nutrient solution is described for hydroponics, I was wondering whether it is useful to apply it also on perlite, and in case yes what is the procedure?
I could not find in literature but in case someone knows anything or knows a good paper please let me know.
Thanks
Relevant answer
Answer
According your question you may adjust concentration of all nutrients of the Hoagland solution in order to check potassium control. You may also take care about the varieties you are using for your work.
  • asked a question related to Nutrient Management
Question
22 answers
Nanotechnology proved to be effective in medical,industry, and other important sectors. The ambition of nanomaterials in agriculture is to reduce the amount of spread chemicals, minimize nutrient losses in fertilization and increased yield through pest and nutrient management. Are they really effective?? And which application proved to be applicable?
Relevant answer
Answer
Thanks, Dr. Chandrakala M. sharing your country's recent applications. How many kilograms is the package which could be substituted by a 500ml bottle?
  • asked a question related to Nutrient Management
Question
16 answers
Urea is the major nitrogen fertilizer in India almost 80% of the nitrogen fertilizer is in the form of urea, so application dynamics of urea with relation to irrigation has a prime importance to increase the NUE and WUE.
Relevant answer
Answer
Urea is rapidly hydrolyzed to ammonium (this process is completed in about 5 days), which can be potentially lost through ammonia volatilization. But if urea is placed at a depth (even 1-2 cm below the soil surface), losses of urea-N via ammonia volatilization are greatly reduced or are minimal. The application of urea before or after irrigation is linked with ammonia volatilization losses rather than the issues discussed above by different colleagues. In coarse-textured soils where water percolation rates are high, it is recommended to apply urea before the irrigation event as the percolating water carries urea to a depth in the soil and urea-N does not remain prone to losses via ammonia volatilization. But one should make sure that the time between urea application and irrigation is kept to a minimum. Urea lying on the dry soil before application of irrigation water can also be hydrolyzed to ammonium though to a limited extent. We need to keep in mind that that urea is very hygroscopic.
In heavy-textured soil, the best way to apply urea is to incorporate it into the soil at a depth. But when urea is to be topdressed while the crop is in the field, apply urea immediately after the irrigation water has percolated down the soil surface. Due to the heavy texture of the soil, water slowly keeps moving down and transports urea to a depth where it is safe from ammonia volatilization losses.
Kindly go through the attached publication of ours. It should make you more knowledgeable on this subject.
  • asked a question related to Nutrient Management
Question
14 answers
Now a days many techniques are available on crop nutrition such as soil testing, plant testing, foliar diagnosis, soil test crop response method and colour chart method etc. Though many number of methods are available to diagnose deficiency or toxicity of nutrients either in soil or on crop plants , identification of type and level of nutrient deficiency or toxicity is difficult for recommending nutrient application. In this connection, discussion on soil mineral resource identification, nutrient release from the particular mineral and quantity of elements release my give better idea on nutrient management for agri / horti /forestry crops especially in organic agriculture.
Relevant answer
  • asked a question related to Nutrient Management
Question
6 answers
Nutrients management is main problem in calcareous soils
Relevant answer
Answer
Simple immobilisation on account formation of calcium phosphate ,in addition to adsorption of phosphates on calcium carbonate particles of calcareous soils...
  • asked a question related to Nutrient Management
Question
4 answers
In the case of nutrient management practices, what kind of changes can we expect in dry matter % as compared to the control where no nutrient was supplied. If we consider a known amount of fresh sample weight whether the dry matter % will increase or decrease in plants having sufficient nutrient supply as compared to the control?
Elaboration:
1. There are two plot conditions; the first one does not have an external nutrient supply hence facing nutritional deficiency ( control) and the second one has sufficient supply of nutrients (NM). All the other factors are kept same.
2. Now we have taken a known amount of fresh chopped sample (say 500 grams) for both the treatments and oven-dried it following the standard procedure.
3. What kind of outcome can we expect for dry matter percentage? whether the Drymatter% of control sample will be higher than the NM or vice-versa?
Relevant answer
Answer
The dry matter content have a direct co-relation with the nutrient management. There are so many research articles, which will help you in assessing the impact of variation in nutrient management on dry matter and nutrient uptake.
  • asked a question related to Nutrient Management
Question
4 answers
We have tried to use FYM for partial replacement of Urea N and simulated with DSSAT. Unfortunately we could not get any effect of it. The model is simply taking the Urea-N ignoring the effect of FYM. Can anyone help us.
Relevant answer
  • asked a question related to Nutrient Management
Question
20 answers
Nutrient management
Relevant answer
Answer
Hi, could you send me your development on PDF format - Is sewage sludge permitted in organic farming as a source of nutrients ?
Of electronic:
Greetings
  • asked a question related to Nutrient Management
Question
21 answers
For nutrient management, primarily based on multilocation trials, blanket fertilizer recommendations (RDF) given to crop, without considering soil nutrient status. Secondly based on Soil fertility chart, fertilizer doses are manipulated. Over these two Nutrient management concept, STCR and IPNS have shown favourable responses on crop yield and soil health. Among these Which one more sustainable in improving crop yield and soil health.
Relevant answer
Answer
In case of STCR and IPNS the STCR is more suitable for plant as compare to IPNS for soil health.
before apply the nutrients to plant its more important to know about the fertility status of our field
  • asked a question related to Nutrient Management
Question
8 answers
Dear All scientific community, please help me to understand the function and mode os application of silica a nutrient to the plants. Is it really worth to apply this as a foliar nutrition, is yes which is the right source for that.
Relevant answer
Answer
Yes! Please see the following PDF attachment.
  • asked a question related to Nutrient Management
Question
21 answers
I plan on conducting the research using slow-release P fertilizers prepared by activating the dolomite phosphate rocks using organic acids. The research question is,
Is slow release fertilizer conducive for plant production?
To answer this question I need to study and quantify the release mechanism of it. What could be the best approach?
I plan on conducting Lab incubation / green house studies in the beginning followed by field works. What soil and plant measurements, (and how) I should take?
Relevant answer
Answer
I agree with above respondent. But I suggest for site specific nutrient management based soil testing and integrated approach of nutrient management
  • asked a question related to Nutrient Management
Question
3 answers
During last 5-6 decades we have generated enough data from traditional experiments on nutrient management with graded levels of fertilizers in almost all systems and situations. Research on permutations & combination of chemical fertilizer is still going on. Is there any need to continue the same for some more decades? OR agronomists should focus more on: (1) nutrient management on the basis of soil fertility status and crop's removal, (2) STCR, (3) SSNM, (4) nano fertilizer, (5) soil fertility analysis by hyperspectral imagery & nutrient management. Certainly for developing & tropical countries INM should be considered to supply nutrients, not to rely only on chemicals, targeting production sustainability.
Relevant answer
Answer
@Jagadish, thanks for your nice analytical comments. Actually we have become too traditional. My request is to think beyond, think latest, think more precisely.
Thanks once again.
  • asked a question related to Nutrient Management
Question
4 answers
Like boron is a crucial nutrient for Cauliflower. Does broccoli has any kind of such crucial nutrient impacting on yield and quality ?
Relevant answer
Answer
Sulphur, boron, molybdenum and zinc.
  • asked a question related to Nutrient Management
Question
6 answers
which nutrient could be responsible for higher curcumin percentage and essential oil in turmeric?
Relevant answer
Answer
Curcumin (1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione), also called diferuloylmethane, is the main natural polyphenol found in the rhizome of Curcuma longa (turmeric) and in others Curcuma spp. Proximate analysis shows nutrients like phosphorous , potassium , calcium and iron are involved...
Some interesting PDFs are enclosed for referal...
  • asked a question related to Nutrient Management
Question
2 answers
Integrated nutrient management based on combined use of organic amendments and chemical fertilizers is very common in South Asia. A large number of researchers have proven its usefulness in terms of better yields than when same amount of nutrients are applied as mineral fertilizers. However, not much information is available as to how much these systems contribute to global warming through emission of nitrous oxide. Recently, researchers from China have a published several papers on this topic.
Relevant answer
Answer
It's very important
  • asked a question related to Nutrient Management
Question
6 answers
Is there a way to stimulate carotenoid (beta-Carotene) biosynthesis on field ?
Furthermore is there a correlation of the Sweet-potato skin color with any fertilization practices ? (more intense orange skin color)
Relevant answer
Answer
Hi!
Are you talking about the Orange Flesh sweet potatoes (OFSP) or normal sweet potatoes? Because OFSP is a genetically improved variety that contain high level of beta-carotene sometimes comparable to carrots.
But talking of a nutrient inducing the biosynthesis of beta-carotene in normal potatoes!! That may be a research topic! Though some mineral elements are Always needed as enzymes cofactors during synthesis, but then the pathway should exist.
  • asked a question related to Nutrient Management
Question
3 answers
I want to get a list of funding agencies who supports nutrient management research specifically in cereal based cropping systems.
Relevant answer
Answer
ICRISAT, CSRI and PD of consern crops.
  • asked a question related to Nutrient Management
Question
30 answers
Many farmer's are applying the fertilizers through foliar, and they are continuously asking what is the use efficiency of this Fertilizer through foliar application, and how to increase the efficiency, please suggest.
Relevant answer
Answer
Following
  • asked a question related to Nutrient Management
Question
20 answers
Is SPAD values of flag leaves were significantly affected by differential fertilizer management?
Is any correlations with grain yield and different growth stages of crop?
Relevant answer
Answer
SPAD Values and Nitrogen Nutrition Index for the Evaluation of
Rice Nitrogen Status( Plant Prod. Sci. 17(1): 81―92 (2014) )
Abstract: Plant-based diagnosis is one of the most important methods to determine nitrogen (N) content of crops. Our objective was to establish the relationship between soil-plant analysis development (SPAD) values and N nutrition index (NNI) during the three developmental stages of rice and apply the SPAD meter as diagnostic tools for predicting grain yield response to N fertilization. We determined the SPAD values of four uppermost fully expanded leaves of two rice cultivars at six N fertilization levels at three growth stages and examined the relationship between SPAD values and NNI. The critical N concentration (Nc) was 5.31 W–0.5 in Xiushui63, and 5.38 W–0.49 in Hang43, where W is the total shoot biomass. The correlation between SPAD value and NNI varied with the leaf position, developmental stage, and variety. The lower leaf appeared to be more sensitive to the N level than the upper leaf in the response of biomass, and could be more suitable as a test sample for N status diagnosis, especially in the booting and heading stage. The dependence of grain yield on SPAD values of the fourth fully expanded leaf (L4) was significant at booting stage (R2 L4 = 0.82** in 2011, R2 L4 = 0.72** in 2012). Ratio of SPAD values of L4 to that in the N-saturated plot (RSPAD) (R2 L4 = 0.92** in 2011, R2 L4 = 0.77** in 2012) and NNI (R2 = 0.96** in 2011, R2 = 0.86** in 2012) at booting stage demonstrated a closer relationship with grain yield. PDF enclosed for further reference...
  • asked a question related to Nutrient Management
Question
5 answers
With Soybean target yield of 18 quintal per acre, I am applying (all dose per acre)
40 kg P2O5 (soil Olsen P is 20 ppm),
45 kg murate of potash (soil K 180 ppm),
10 kg sulphur (gandhak)
Micronutrients mix, sulphate salts of
10 kg Zn and Fe each; 2 kg Cu and Mn
And 1kg Mo and B.
In addition 2 T Vermicompost
(Along with Rizobium and PSB seed treatment)
In highly cited review paper on Soybean N uptake, there is reference of 200 Kg N uptake (above ground biomass) by 20 qtl / acre Soybean. With 20% in below ground. This is 240 kg/acre. Assuming 40 % uptake from BNF, this works out to be ~ 140 kg. However excess basal dose negativity affects nodule establishment. So I propose to experiment a split application: Basal 40 kg (Ammonium in DAP + Urea). Which should be the next points of applications?? And in what form?
Relevant answer
Answer
I agree with Kulvir Singh in the inadvisability of applying nitrogen on soybean. Soybean is sensitive to low soil acidity if you can get a soil pH reading liming maybe one of your best options for optimizing soybean production. In relation to nutrient application the phosphorus is best applied close to the seeding area to stimulate early growth and rooting. The potassium is best applied at flowering to stimulate the translocation of photosynthetate into developing pods. In terms of micronutrients if the pH is right you might not have any issue at all. If in the vegetative stage you get chlorosis the type of micronutrient deficiency can be found by leaf tissue analysis. In alkaline soils iron and manganese deficiencies as well as zinc are possible. If you have accessibility of rock phosphate and you have an acid tendency soil I would suggest mixing vermicompost with phosphate as your starter fertilizer then use potassium at mid flowering. If you have any soil or leaf analysis I would be glad to give an assessment based on my experience.
  • asked a question related to Nutrient Management
Question
4 answers
I am thinking of conducting a research in Terai of Nepal based on the principle of Site Specific Nutrient management in Rice. The farming of Rice in the region is lowland and rainfed, while the cropping system is either, Rice-Wheat, Rice-Maize or Rice-Mustard/Lentil or Rice-Fallow depending upon places. I want to perform research in the farmer's field rather than research station, so I'm looking to hear from you, about the best SSNM approach for the farmer's field, so that farmers can also benefit from the research. Thank you!
Relevant answer
Answer
PFA
SSNM CONTENT OF UTILITY
  • asked a question related to Nutrient Management
Question
17 answers
SSNM is a general concept for optimizing  the demand and supply of nutrients according to their variation in space and time. What should be the right approach to evaluate it, Is it a component of site-specific crop management or precision farming?
Relevant answer
Answer
I agree with you Dr Tarafdar. If have to make an effective use of soil fertility variograms, we need to have crop nutrient requirement . And this information has to be soil, cultivar/ variety and desired yield specific....then only SSNM could be effectively use as a part  of precision nutrient management.We also have to  make distinction between nutrient uptake and nutrient removal..
  • asked a question related to Nutrient Management
Question
6 answers
Redox state and prevailing ambiance influence heavy metal inactivation and detoxification as well as transformation of nutrients (C, N & P) in soil and aquatic environment
Relevant answer
Answer
Most of the studies have been done with regard to biochar originated from plant biomass. Application of biochar , especially in acid soils has proven more beneficial than alkaline soils.  hoever , there are  pressing documents to prove that biochars are equally effective in alkaline soils as well . Application of biochar invariably improves the adsorptive capacity of soils through enhancement of CEC of soils, therefore , better NUE can very well be anticipated. If it is acidic soils , it brings an improvement of soil pH , thereby ,  brings  conspicuous imprvoments in soil fertility plus biological soil properties as well. but , the most distinctive advantage of biochar as an physical amendment is the  provision of carbon contributing handsomely towards the non-labile fraction of soil SOC, as the carbon from biochar has maximum residence time compared to ant other form of organic residues including the organic manures... 
  • asked a question related to Nutrient Management
Question
7 answers
A large amount of nutrient waste is getting disposed in surface water sources. Point and non point sources of pollutants are disposing their waste into the surface water sources. is there any free nutrient model available for nutrient management at regional basis.
Relevant answer
Answer
Here is another concept called 4R-nutrient Stewardship concept ..
The 4Rs of nutrient management— applying the right fertilizer source at the right rate at the right time and in the right place—easily summarize the increasingly complex fertility decisions that have to be made by CCAs and their farmer clients. In this issue, we take a look at how this concept is being implemented in the field.by By Tanner Ehmke, Crops & Soils magazine contributing writer
PDf enclosed for  further reading ...
  • asked a question related to Nutrient Management
Question
3 answers
In my study, planktonic individual & planktonic consortia mode of bacteria was used for nutrient (ammonia, nitrate and phosphate) removal. The obtained result was the highest nutrient removal with planktonic individual than planktonic consortia.Why?
Relevant answer
Answer
Himanshu , have you tested their complimentarity , that they do not inhibit the activity of each other  over a period of time when studied in a consortium mode than they are independent to each other. Thats the most critical point in the efficiency of any microbial consortium ..? Unless this is tested , you can not declare a group of  microbes as consortium..? Rossiana has raised a valid point. 
  • asked a question related to Nutrient Management
Question
3 answers
Im looking for literature on potassium and phosphate leaching in apple orchards.
I have papers by Neilsen 1985 and Siczek 2008, but I'm really looking for something more substantial, either journal papers or reports.
Relevant answer
Answer
Let me put up another response . Nitrogen leaching followed the similar pattern during the times of fertigation ( April -June) ..Here is PDF enclosed for further reading ..
  • asked a question related to Nutrient Management
Question
12 answers
Few aspects: pre- sown, mid course and post-harvest  advisories, soil health service, water and nutrients management, general package of practices, problem soils remedies, insects-pests forecasting, market intelligent systems, forewarning systems, weather-based agro-advisories etc
specific examples of successes at regional scales
Most of decision tools are preliminary or very crude or based on simple thum rules
Large useful information available, but scattered, not collated on common decision platform
Special section to be created for problem/degraded lands
Problem in yield forecasting in areas under intensive agriculture or for tropical/sub-tropical geographies
Contrasting results sometimes available in published literature, bring us at confused platform, possibly in a hurry to publish results by some of the research groups
Central platform of knowledge dissemination most of the time missing
Isolated subject matter research outputs, not collated for a systems' approach
May i am indicating more negative points, in order to create discussion, although significant research being/has been done by most of the researchers
Need of advanced computational methods/professionals to create DSS, effective to integrate relational layers and crop simulation tools for the decision making
regards
Relevant answer
Answer
Thanks Dr Biswas, sometimes the results of various agencies are contrasting so create confusion. Some of the agencies disseminate results with their selfish motive and interest, so may be misleading. IF A CENTRALIZED PLATFORM (PUBLIC-PRIVATE INTERACTION) is established with useful content for dissemination, farmers may start relying on the link/agency for agro-advisory inputs. We have to target in this direction, which is missing even in India too, although some successful regional platforms are available
regards
  • asked a question related to Nutrient Management
Question
4 answers
To me as a crop modeller, very tough situation-
Many nutrients,
Non-linear and complex interaction amongst them for availability and uptake
Complex behaviour under different production environments
Not following any definitive behaviour, which could be expressed through numeric approach
Technical coefficient, thumb rule, experts judgement followed
STCR equations show location and temporal specificity
Modelling multi-nutrients system on dymanic/mechanistic scale too cumbersome 
Mechanistic cum empirical approach seems solution, but to be initiated through coordinated networks
Soil biological aspects happen to be relatively weak in crop simulation models, although incorporated, but rather in a very crude and empirical way
pl help the group to handle this situation
regards
Relevant answer
Answer
Seeing  a very meak response , let me trigger some discussion on such an interesting topic. Do you feel , that the major  types of nutrient interactions will undergo some basic changes , regardless of nutrient management strategy .... 
For example, if High phosphate induced zinc non-availability operational under conventional fertilization programe,  will vanish under INM strategy..?
  • asked a question related to Nutrient Management
Question
6 answers
Soil health assessment to be used for irrigation/nutrients management, tillage options, identification of suitable resource conservation technologies
Soil health assessment in terms of soil physical, chemical, physico-chemical and biological health
Soil quality index to be computed from easily determinable and easily available soil parameters
Effective application of these methods on operational scale
Relevant answer
Answer
Sir,
Division of Agricultural Physics, ICAR-IARI, New Delhi has developed online calculator for soil physical health assessment. You can visit the following website
Another bit more comprehensive one developed by Division of Soil Science and Agricultural Chemistry, ICAR-IARI, New Delhi which can be found at the following website
After registration you can use that.
  • asked a question related to Nutrient Management
Question
26 answers
Just taking samples from the topsoil? And what depth is for you the top soil => ploughing depth (e.g. 25 cm) or working depth e.g. working depth of the cultivator (e.g. 12 cm)? And what does the difference from 12 cm to 25 cm mean for the calculating of the right amount of nutrients?
Or do you recommend to do the soil sampling for the analysis of P, K and Mg for the subsoil also?
To have soil samples for the topsoil (0 -30 cm) and from the subsoil (30 – 60cm), does make it senses? And how do you will take the results from the subsoil into account for the calculating of the right amount of nutrients?
Thank you for your answers!
Best greetings from Osnabrück, Stefan Hinck
Relevant answer
Answer
Most important is to know the feeder root zone of any crop , and this zone will not vary much , despite other favorable soil conditions,since it is more of genetically controlled than any other mechanical factors. Very often , there is strong effect of seasonality on feeder root distribution pattern . So , fertilizer application needs to be tuned according to seasonality of feeder root distribution pattern . Therefore , we will confine to such soil depth only , rather than worrying for other depths , where there are lesser proportion  of feeder roots , unnecessary adding to the fertilizer doses, with much reduced fertilizer -use-efficiency.
  • asked a question related to Nutrient Management
Question
11 answers
Hello All...
I am here to know that what is the effective dose of botanicals under field condition for the nutrient management. Please be known that many scientist have used botanical on the basis of N contents @110 kg N/ha. There is lot of confusion in the recommendation of botanicals' dose. Some where I have found 3 or 5 10 or 12.5 or 20 or 25 tonnes/ha for the same crop even in the same area and same crop.
Experts are requested to suggest in this matter.
Rizwan Ali Ansari
Relevant answer
Answer
 Use of botanicals as a nutrient source is , infact , not so popular for alleviating nutrient deficiencies or as maintenance dose . Green manure is very popular practice with or without cover crops as popular practice of floor management , but i doubt , these practices could , anyway meet nutrient requirement of the crop  , could be possible for some ornamental plants..?
  • asked a question related to Nutrient Management
Question
6 answers
Dear friends
I agree that the nutritional composition of the food crops, fruits and vegetables can be improved through breeding, transgenic and other biotechnological approaches. Is it possible to increase the nutrient content i.e. Zn content in particular variety of any crops through nutrient management and microbial interventions?. Eg. P content in banana varying from 0.20% to 0.35% due to nutrient management and microbial interventions. Whether this kind of variation is possible or not? If it is so, the entire nutritional compositions of fruits or vegetables will vary accordingly. Some clarity is required in this regard.
Relevant answer
Answer
Andrea , thats a good point . but , this will only reveal the changes in nutrient density of different crops grown over the years. And , it will let you know , how  has this  happend , simply because of the nutrient mining . In some cases , the reduction in nutrient density has not been experienced , for example , in europe.
However , our most important and genuine concern is , how can we raise the nutrient density in edible plant parts . unfortunately , most of the edible plant parts are considered very poor sink for micronutrients ?. How can we produce /breed the crop varieties having higher nutrient -use-efficiency.   
  • asked a question related to Nutrient Management
Question
90 answers
Fertilizers are considered major drivers of agriculture , contributing nearly half of the total cost involved in  production of any crop. Of late , there has been paradigm shift in fertlizer use from straight conventional fertilizers to complex fertilizers to customised fertilizers.  In this background , i am proposing following issues to be  addressed with central theme of inter-relation between customised fertilizers and site specific nutrient management  through comprehensive discussion :
* Distinct  benefits of customised fertilizers over conventional fertilizers.
* Customised fertilizer use as virtual answer to emerging multiple nutrient deficiencies.
*  Crop -specific customised fertilizers.
* Soil -specific customised fertilizers in the light of soil fertility variogram.
* Customised fertilizerss compatibility with fertigation and hydroponic use.
* Customised fertilizers and fertilizer-use-efficiency. 
Thanks and regards  for your precious responses
Relevant answer
Answer
Site-Specific Nutrient Management (SSNM) provides guidance relevant to the context of farmers’ fields. SSNM maintains or enhances crop yields, while providing savings for farmers through more efficient fertilizer use. By minimizing fertilizer overuse, greenhouse gas emissions can be reduced, in some cases up to 50%
KEY MESSAGES:
1 Site-Specific Nutrient Management (SSNM) optimizes the supply of soil nutrients over space and time to match crop requirements.
2 SSNM increases crop productivity and improves efficiency of fertilizer use.
3 SSNM mitigates greenhouse gases from agriculture in areas with high nitrogen fertilizer use.
4 Incentives for adoption of SSNM depend strongly on fertilizer prices.
  • asked a question related to Nutrient Management
Question
7 answers
Because of the future phosphorus deficiency in the world, I am looking for possible solutions/possibilities within onion and potato plant breeding focused on nutrient-efficiency and phosphorus uptake in particular. 
Relevant answer
Answer
Hi Sjoerd,
I hope the folowing artcles will be useful for you.
Best regards,
Noemi
  • asked a question related to Nutrient Management
Question
71 answers
Behavior of crops and soils is never uniform on a geographic unit , necessitating further the utility of correct diagnosis-based nutrient application . However, there are still many discrepancies in optimizing the crop response , distinct  failure to produce economic response of fertilizer is one of them . Highlighting these issues, my present set of questions is dedicated: 
* Do you feel, if different crops are grown on the same soil type, fertilizer recommendation will change?
* How do we arrive at crop-based fertilizer recommendation?
* How does such fertilizer recommendations take into account  the residual and cumulative effects of fertilizers?
* Do you feel, soil test/plant analysis -based crop response is still the only  diagnostic basis of such crop behavior?
* If so , how will you determine the efficacy of one test over other test methods?
*What is the utility of  4R-Nutrient Stewardship in optimizing the crop nutrient response?
Thanks and Regards
Relevant answer
Answer
Dr Anoop,
Thanks for providing the opportunity to be part of an important discussion.
Fertilizer recommendation in same soil type should be different for not only crop species, rather we should have it for different varieties of the same crop.
Regarding general fertilizer recommendation my views look absurd and may not be appreciated. Farmers' do regular monitoring for good production. It's not always the appropriate quantity or volume, but timely and efficient management of inputs that gives the best economic benefit, which is one of the main criteria for fertilizer prescription. So, the CARE is more important than precise applications. Can we think of fertilizer recommendation on the basis of soil physical condition (soil type as you mentioned, water retention/movement capacity, drainage and aeration status etc), soil biological environment (SOM, soil micro-flora which has been a topic of discussion in one of your questions, enzyme etc etc) and crop characteristics (root growth behaviour, shoot:root ratio, nutrient partitioning pattern etc)???
Thanks and regards to all.
  • asked a question related to Nutrient Management
Question
28 answers
1. Lot of information on soil test values (spatio-temporal)) available
2. Soil quality indices e.g. SQI by Ratan Lal et al, Cornell soil health index, STCR network ar Indian Institute of Soil Science  etc available for application
3. Potential of use in nutrients management, water management, tillage options, crops'/cropping systems suitability, residue management, problem soils management demonstrated mainly on research farm fields with limited scale case studies in smaller regions
4. e-communication of advisory to farmers (demonstrated at limited scale)
No real effective soil health service, specifically in regions with intensive agriculture (in particular south asia, south-east asia, regions in africa)?
How to handle the situation for effective operational soil health service?
Relevant answer
Answer
Is there rapid field test available for diagnosing the microbial abundance of soil as indicator of soil health ? . Another problem , one may face is with regard to utmost sensitivity of soil microbes to any kind of input or even any adversity in climate , such microbe may undergo   changes in structural  and functional  diversity . there are so many soil health -related parameters , but we need to have a parameter which fairly stable over time and space , from  convenience in  evaluation  in field , and possibly in field 
  • asked a question related to Nutrient Management
Question
70 answers
Number  of methods ( Soil fertilization ,  Foliar fertilization , Trunk nutrition , Fertigation ,  Organic manuring , Integrated nutrient management ) are adopted in meeting the nutrient requirement of crops. These methods of fertilization have their own merits and demerits , depending upon the crop , soil conditions ,agroclimate etc . It is equally difficult to claim one method of fertilization as most efficient , since fertilizer-user-efficiency is the major concern .  I have following questions to offer to my learned colleagues to respond please:
* Foliar fertilization is more suitable to which kind  crops?
* What are the basic foliar characteristics of a crop to facilitate better efficacy of foliar applied nutrients? 
* Do we need to neutralize the pH of the foliar  solution ?
* Whether use of surfacetant will improve the efficacy of foliar applied nutrients ?
* Is there any role of microbial formulations to be a part of foliar sprays ?
* Why a foliar spray of multi-micronutrients , especially containing Fe, Mn and Zn together  develops toxicity symptoms on the foliage?
* What are ways and means to improve the efficacy of foliar applied nutrients?
*  How can we domesticate the conventional micronutrient fertilizers for effective  foliar sprays?
Relevant answer
Answer
Angamuthu , I am talking of any nono-fertilizer suitable as a nutrient source , if you dissolve it in water , the identity of that nano-size is lost since it is cent percent solubilized in water . On the other hand , you take any  commercial fertilizer ( For example ) , you dissolve it in water , it solubilized cent percent in water . Now compare the efficacy of two fertilizer sources ( Dissolved nano-size fertilizer or dissolved commercial fertilizer)as foliar spray , Do you feel which one will perform better?
  • asked a question related to Nutrient Management
Question
3 answers
I know the best time for applying fertilizer for mature plants are after rainfall seasons means between 6 or 8 months. I want to know more specific time (the months ) for that in Malaysia 
Thank you so very much 
Mohammad Yadegari 
Relevant answer
Answer
Dear Mohamad Yadegari
Your need for supplementing oil palm will best be served by doing foliar analysis and comparing to optimized values for the stage of development.
For accurate foliar analysis you will need 20 leaflets to be dried and analyzed. Some people can judge this based on the leaf color and there are chlorophyll meters which can be useful.
The greatest use of Nitrogen is in peak stages of growth and care should be taken not to over amend with Nitrogen as the plant will be top heavy. Depending on the acidity of the soil you may want to change how you amend your plant for Nitrogen. With your foliar analysis you will also get insight on other critical elements which might not be optimized and it may suggest soil treatments for further plantings.
Your nutritional plan should always include the complete soil analysis and even water analysis if you irrigate and needs fluctuate depending on the changes of environmental conditions particularly rainfall which will cause leaching and denitrification.
  • asked a question related to Nutrient Management
Question
4 answers
We know that sodium is the most important ion for HD patient for weight gain in the interdialytic period. I mean, if the patient has a lot of salt, weight gain will increase. Is the same situation valid for the dialysate sodium levels? If dialysate sodium is higher, can sodium loading be dangerous to the patient?
Relevant answer
Answer
thank you for your kindness.
best wishes
  • asked a question related to Nutrient Management
Question
18 answers
What is the recommendation for the period of basic soil nutrients P, K, Mg sampling on arable land? All 3 to 4 years, ... shorter or longer?
Thank you! With best regards from Osnabrück, Stefan
Relevant answer
Answer
Off course , i am bit too late to respond to this question , but  better  late than  never . We in perennial crops recommend to undertake analyis for P,K,Mg  at an every alternate years.  Putting too many slag years, probably will put the  potential impact of  fertilization in a bit of jeopardy. We very frequently use leaf nalysis in conjunction with soil analysis for addressing these nutrients with regard to their budgeting.
  • asked a question related to Nutrient Management
Question
59 answers
Perennial crops are distinctly different than annuals ,in terms of  long juvenile period, perennial framework , long  annual  growth cycle etc . Number of  nutrient management practices are in vogue. These practices comprise of :conventional basin application of nutrients using the optimum dose  , microbially loaded organic manures plus  rainfed green manuring  , integrated nutrient management involving  a combination of inorganic fertilizers , organic manures, and  single/multiple inoculation of  microbes,  fertigation , site specific nutrient management , biodynamic  farming, Panchgavya farming  etc , all   with only one objective to meet the nutrient demand of the crop  through balanced fertilization , taking into the account , the nature and properties of soil  . It is really point of debate amongst researchers, as which  method of fertilization stands out to be the best . I invite the comments of our esteemed researchers.  
Relevant answer
Answer
A nutrient management strategy said to be effective has to be sustainable , Shashi. Which method of nutrient management is best with respect to quality production of crop  without incurring any potential mining of nutrient reserve of soil , means considering the overall  impact. And any practitioner of nutrient management would surely look at all these , with sustainability of the practice at the top.
  • asked a question related to Nutrient Management
Question
6 answers
I am working on optimization of nitrogen in maize and want to compare different regression models to determine economic optimum rate. I found somewhere in literature that quadratic model did not give valid description of the yield responses and tended to indicate the optimal rate of fertilization that were too high and the same happened in my work also. Quadratic plus plateau model may best describe the yield response but I do not have any idea how to develop such a model and which software is useful in this regard.
Relevant answer
Answer
Please look into the following paper:
Comparison of modified Mitscherlich and response plateau models for calibrating soil test nitrogen recommendations for rice on Typic ustochrept. K. Alivelu and others 
Communications in soil science and plant  analysis 11/2003 34,2633_2643
  • asked a question related to Nutrient Management
Question
4 answers
The nutrient status of arable land has to be determined. The soil sampling is vehicle-based and is carried out in the tramline.
Is soil sampling in the tramline recommendable ?
Relevant answer
Answer
Dear Stefan,
                      If you get arable lands for sampling near the tram line in which agriculture is regularly practised and is in no way disturbed by other anthropogenic activities, you can collect samples. Most important is that your research design should be in the tune of your research objectives.
Good wishes.
Soumendu Chatterjee 
  • asked a question related to Nutrient Management
Question
4 answers
I would be interested to know if after a full cycle of forest plantations of Pinus sp without fertilization, if they could recover the initial level of nutrients (e.g. by atmospheric deposition) or if that level is never recovered. 
Relevant answer
Answer
Hi,
You can find the review I made for radiata pine on page 182 of 'Sustainable Management of radiata pine plantations' FAO forestry paper 170'.  It is available on-line or can be downloaded through my Research Gate  site. In Table 10.2 the data is presented on  a mean annual basis, with the 'Other inputs' line being rainfall for P and cations.
Although there are many variables involved, stem-only harvesting is usually OK in the long term on many sites. Weathering rates, erosion, leaching losses and N fixation etc, as well as rainfall needs to be considered. Weathering is often more important than rainfall inputs for P and cations.
Some researchers have also developed models that can be run to see if there are trends over several rotations, but of course they are only so good as the data used to develop them and assumptions made. 
Don
  • asked a question related to Nutrient Management
Question
4 answers
Please provide me the information if you have . it is needed for my research work.
Relevant answer
Answer
Dr. Sunil,
My name is Emerson. I´m working at Brazilian Agricultural Research Corporation (EMBRAPA). My collegue Dr. Israel Pereira Alexandre Filho is working with organic fertilizers in babycorn and can help you. Your mail adress is israel.pereira@embrapa.br.
  • asked a question related to Nutrient Management
Question
3 answers
I want to evaluate the role of sulfur and zinc on weed emergence in Dry Direct Seeded Rice.
Relevant answer
Answer
Thanks