Questions related to Plant Nutrition
Hello dear researcher,
I am very eager to participate in writing part of your research, if possible, and do whatever my scientific ability allows. My favorite topics are plant nutrition, environmental stresses and other aspects of crop physiology. Thank you very much.
Ph.D in Agronomy.
My research investigated the impact of water stress on plant nutrition. Phosphorus content was stable regardless of increasing PEG concentration. Is there any valid explanation on why as i am trying to find the reason
According to inquiries developed so far through Scientific Method, roughly from last 400 years, plants need 17 essential elements to produce and complete its vital cycle, otherwise there will be deficiencies with negative consequences upon productivity or even causing whole death of plant. Overall these elements are divided in two categories: macro (C, H, O, N, P, K, Mg, Ca, S) and micro-elements (Fe, Cu, Mn, Mo, Ni, B, Cl, Zn). Equally, another main concept inside plant nutrition is "The law of the minimum" which states that if one of the essential nutrients named before are scarce, the plant productivity will go down even if remaining nutrients are plenty. This statement is attributed to german chemist Justus Von Liebig in 1840, although, 12 years ago before that (1828), Carl Sprengel, a german agricultural chemist stated that the mineral elements are necessary for life plants and irreplacable. ¿What do you think about? ¿Who's the idea owner?
Most of the springer journals (e.g., Journal of Soil Science and Plant Nutrition or Journal of Plant Growth Regulation) didn't publish any new articles (Online first) after 3rd December! is there any problem? or updates?
- The chloride anion (Cl-) has traditionally been considered a harmful element for agriculture due to its antagonism with the nitrate anion (NO3-), and its toxicity when it accumulates in high concentrations under salinity conditions. On the other hand, Cl- is an essential micronutrient for higher plants, being necessary in small traces to fulfil a number of vital plant functions such as: cofactor of photosystem-II and some enzymes; neutralisation of positive charges in plant cells; and regulation of the electrical potential of cell membranes. Below a specific level in each species, plants suffer symptoms of Cl- deficiency, altering these cellular mechanisms and negatively affecting the capacity for cell division, cell elongation and, in short, the correct development of plants. However, there are indications in the literature that could suggest beneficial effects of Cl- fertilisation at macronutrient levels.
- The results of my thesis have determined a paradigm shift in this respect since Cl- has gone from being considered a detrimental ion for agriculture to being considered a beneficial macronutrient whose transport is finely regulated by plants. Thus, we have shown that Cl- fertilisation in well-irrigated plants promotes growth and leads to anatomical changes (larger leaves with larger cells), improved water relations, increased mesophyll diffusion conductance to CO2 and thus improved water and nitrogen use efficiency (WUE and NUE, respectively).
- Considering that the world's population is expected to reach 9.8 billion people by 2050, global efforts are being made to increase food resources by improving crop productivity. This requires practices that make rational use of available resources, particularly water and nitrogen (N). Only 30-40% of the N applied to the soil is used by plants, and 80% of available freshwater resources are currently being consumed by agriculture. On the one hand, an excess of NO3- fertilisation in crops leads to an increase of NO3- content in the leaves of plants of different species that are consumed fresh (e.g. spinach, lettuce, chard, arugula). The presence of high levels of NO3- in food can cause health problems such as methaemoglobinaemia or promote the accumulation of carcinogenic compounds. These practices also lead to an increase of percolated NO3- in aquifers, causing environmental problems such as eutrophication.
- In broadleaf vegetables, NO3- and its derivatives can accumulate to high concentrations. When ingested, these compounds are processed by enzymes found in saliva and from bacteria of the gastrointestinal microbiota, generating NO2-, nitrosamines and/or N2O5, substances that promote stomach and bladder cancer, causing a serious problem for human health. When NO3- enters the bloodstream, it transforms haemoglobin into methaemoglobin, no longer able to transport oxygen to the lungs, causing babies to suffocate and die, which is what is known as 'methaemoglobinaemia' or 'blue baby disease', and which, as we have already mentioned, was made visible by Greenpeace on numerous occasions. Thanks to these actions, in the European Union there is a very demanding regulation of NO3- content in water for human consumption, as well as in vegetables and processed foods especially dedicated to the production of food products for susceptible groups such as babies, the elderly, vegetarians and vegans. Thus, the European Union has established a series of strict standards (1881/2006 and 1258/2011) that determine a series of thresholds for NO3- content in the most widely consumed vegetables (such as spinach and lettuce), and especially in baby food with much stricter limits, where it is even recommended to avoid the consumption of certain vegetables in babies before the first year of life and to limit their consumption in children from 1 to 3 years of age. At the environmental level, the European Union already created in 1991 the Nitrates Directive (European Directive 91/676/EEC), to protect water quality throughout Europe, encouraging the use of good agricultural practices to prevent NO3- from agriculture from contaminating surface and groundwater.
- Substituting certain levels of NO3- for Cl- in fertigation solutions can reduce these problems without negatively affecting plant development. On the other hand, in the context of current climate change, the strong demand for water from agriculture threatens the freshwater supplies available to the population. Therefore, increasing WUE and NUE, as well as preventing water deficit and increasing water stress tolerance in plant tissues are very important traits for crops that could be favoured by the use of Cl- in new agricultural practices. Thus, Cl- could establish a synergistic improvement in a more efficient use of water and nitrogen for a healthier and more sustainable agriculture.
Exist there any standard text book in universities for students dealing seriously with amino acid fertilizers as state of the art in plant nutrition ?
Look here, they make much proaganda in Africa with this I this, I think myself pseudo / fake fertilizer and pest regulator but also here in Europe with similar EM (Effectice microorganisms)
In organic farming, it is said that 'feeding the soil always feeds the plants'. How can marginal and small farmers supply such a huge quantity of different organic manures every year ?
My greenhouse maize plants are too thin. They have strips on the leaves.
The conditions are 14h day/10h night; 26-28°C day and 20-22°C night; 60% humidity; peat soil mixed with little sand.
I use Osmocote exact Standard 3-4 for fertilization. It is a granular and should work for 3- 4 month. It contains all important nutrients which dissolve gradually:
16% nitrogen (7,4% nitrate-N and 8,6% ammonium-N)
The plants are at V4 stage now.
I think that the plants have a nutrition deficite. What is the best fertilizer for greenhouse maize? Du you have any suggestions for improvement?
I've been struggling with this matter:
We have data on sugar cane production (soils, treatments, weather …). We want to understand in which conditions soil/plant nutrition will yield the best result. It is hard to infer causality as some treatments are often performed jointly and we are not able to isolate the partial effect of the applications of interest.
Any one has any leads on interesting statistical methods please ?
Thanks a lot
Hydrogen fuel cell use O2 from atmosphere or cylinder and generating energy and distilled water. As being explosive in nature, Hydrogen fuel cells may blast and harm public nearby. Further consumption O2 particularly in residential areas may create problem for public inhalation and COx emissions may further disturb.
Use of distilled water out may harm agricultural/ plants nutrition if not collected properly and disposed off.
What will be impact of mass scale use of hydrogen fuel cells as energy source?
I am wondering after how much time of organic agriculture one would expect to run into a deficiency of geogenic nutrients (P, K, etc.).
Let me explain: From what I understand, mineral fertilizers are largely forbidden in organic agriculture and organic fertilizers as manure or compost are sourced from other crops mostly on the same farm. This practice transfers nutrients from less nutrient intensive crops to higher demanding sites, but does not replace the nutrients exported through the harvested products. Those products go to consumers and the nutrients end up in waste water treatment plants and/or surface waters.
As mineral weathering is a slow process, I guess that nutrient stocks in the soils are depleted over time. Please correct me if my reasoning is wrong at some point. I would like to know if there are mass balances estimating this time for different crops/landscapes?
PS: obviously this argument does not hold true for N as it can come from the atmosphere through nitrogen fixing organisms.
Is it possible to conduct an experiment without proper control where the effect of several doses of a particular nutrient on a particular crop will be evaluated? Is it possible to compare these doses with one another rather than comparing with a formal control using DMRT or turkey HSD? Again if we take two factors( two different nutrient sources and their respective level) is control is still needed as levels? For example if I take thee doses of nitrogen (100 kg N/ha, 150 kg N/ha and 200 kg N/ha) and three doses of potassium (50 kg k2O/ ha 100 kg k2O/ ha and 150kg k2O/ ha) in FRBD design; is it necessary to add another level as the control in nitrogen where no nitrogen will be applied?
What is more reliable for establishing optimum leaf nutrient concentrations of plants, particularly trees? The focus is on boundary-line approach and compositional nutrient diagnosis norms.
Anthocyanin pigments have several colors that vary depending on their influence on a range of factors, including acidity of the medium, temperature, level of plant nutrition, agricultural servicing ..etc.?
I am working on a dataset to derive optimum and sufficiency ranges of leaf nutrient concentrations in olive. I am searching for a reliable reference to compare it with the ranges generated by me.
I need to evaluate the effect of elicitors and fertilization doses in the hormonal, spectral, and physiological response in Citrus latifolia plants infected with Candidatus Liberibacter asiaticus (CLas) in a greenhouse. The challenge is 1) to found for the best method of infection 2) to standardize a methodology to have diseased plants in a short period and that the plants get sick a similar period for later analysis with the same conditions.
I would greatly appreciate it if someone has an idea or experience with the intentional infection of plants with CLas. Thanks a lot.
Can plant nutrition with fertilizers have a negative or positive effect on plant resistance to diseases and insects?
We repeatedly measured the same sample (QC0.2) using an ICP-OES, but the intensity decreased along with the analytic sequence for Zn, Cu, Fe, as well as other elements.
The sequence is:
[2Blank + QC0.2] repeat 14 times
QC0.2 is 0.2 ppm of multielement ICP standard in 2% HNO3.
The intensity of Zn at 202.548 nm, for instance, decreased about 30% from the beginning to the end.
The data are attached.
We have checked the hardware: like the position and cleanness of the spray chamber, the pump tube, the plasma torch, etc., but still, we couldn't find the problem causing this intensity dropping.
Has anyone had ever experienced a similar problem? How did you solve it?
Your answers will be very helpful for us!
I use light protected jars and big falcon tubes to grow my plants. Usually, I don't get algal contamination when growing plants for 2-3 weeks. But, sometimes I get algal growth in my samples. It would be great to have your views on following questions.
1. Is it common?
2. How do you deal with it?
3. How much impact it can have on normal growth and development, if I am regularly changing the media every 2 days?
4. Can I use MICROPUR CLASSIC MC 10T tablets?
5. Although, hydroponics is a non sterile system; is it okay to consider this system for comparative physiological & molecular studies if I am getting mild algal growth once in a while?
I have received conflicting information about the exchange of ions during K+ uptake by roots in hydroponic systems. The first explanation is the root releases H+ in exchange for K+ to maintain electronegativity in the hydroponic solution thus lowering the pH. The second explanation is the root releases carbonates in exchange for K+ thus raising the pH. Which explanation is correct?
I know that there are different K+ transporters (low affinity at high K+ concentration, high affinity at low K+ concentration). Could these conflicting explanations be based on different K+ transporters?
Calcium nitrate Ca(NO3)2 given same N use efficiency in all parts of plants which application in acid soil low pH. in comparison for NH4 sources, I appreciate all scientists comments, that could be explaining those reasons. thanks in advanced.
Foliar fertilization is a quick and efficient way to improve crop nutrient status during periods of high nutrient demand in the crop, or soil-applied fertilizers less available to the plant.
My questions what is an appropriate time to supply nutrients as foliar for sugarcane crop. The nutrient contains nitrogen, phosphorus, potassium, Sulfur, Calcium, Magnesium, zinc, iron, manganese, and copper when we added as a single or combined system.
. it is critical to determine the effect of crop load on the capacity of properly timed foliar fertilizers to increase the yield of sugarcane.
The question for researchers in the fields of soil science, plant nutrition, crop physiology and agronomist specialized in sugarcane crop.
Therefore, my request is to provide me with any practical suggestions to increase my knowledge concerning these issues, besides the literature review, technical report and articles also are needed.
During water deficit stress, plant shows several responses. If fertilizers or other chemicals are applied, how their absorption will be affected, is there any reference please?
We are detecting Indole acetic acid (IAA) producing actinobacteria according to Bano and Musarrat (2003) method.
The summary of the method is:-
Inoculation of the isolates in LB medium (supplemented with 0.5% glucose and 500 μg/mL tryptophan) -----> Incubation at 28 ◦C for 48 h -----> Centrifugation of the cultures at 10000 rpm for 15 min ----> 2 mL of the supernatant were transferred to a fresh tube to which 100 μL of 10 mM ortho-phosphoric acid and 4 mL of the Salkowski reagent (1 mL of 0.5 M ferrous chloride in 50 mL of 35% perchloric acid) were added ------>incubation of the mixture at room temperature for 25 min and the absorbance of pink color development read at 530 nm -----> Calculation of the IAA concentration in cultures.
Is there any method better than this one? or if any modification?
I am trying to estimate phytate-P from soil by enzyme addition method. I consulted several papers and most of them had use malachite green for P determination. I followed the method described in Jarosch et al., 2015 and tried several time for estimating MRP from NaOH-EDTA extract of different soils, after and before enzyme incubation. But I failed to develop color in every cases. Rather I ended up with greenish precipitate inside glassware. I am unable to understand the problem, can anybody please help me?
It seems that original wild plants are more resistant to diseases and parasites that those selected and "improved" for their commercial value
Usually, translocation factor is used to study heavy metals accumulations in plants. Is it possible to also apply this method to study macro and micronutrients translocation?
Hi all professors
would you please tell me about your experience in advicing fertilizer which contains tiosulphate calsium and tiosulphate potassium.
What are the advantages of using Tiosulphate calsium and Tiosulphate potassium?
thanks so much
Nano fertilizers have a tremendous surface to volume ratio. From this point of view, it should make nano particles super reactive. If it is super reactive then it should be easily fixed in soil. But inspite of these, how nano material remain available for longer time with high efficiency in soil for plant nutrition?
I am working on boron deficiency in Indian mustard.
During screening of different mustard genotypes I found the plants did not show any symptoms of boron deficiency, for a prolonged period, when I transferred directly to 1X Hoagland's after germination.
But when I slowly increase the nutrient concentration (from 1/4th, 1/2 and then to 1X), as mentioned in Xu et al 2012, the plants started to show symptoms respective to the Boron deficiency.
So then I got these questions:
1. As we all know plant's nutrient requirement depends and vary upon their developmental stage. Is that possible that excess concentration of nutrients (1X Hoagland's immediately after germination) hindered the deficiency symptoms of Boron?
2. Moreover, I found the survival rate of the seedlings were much better when I increase the nutrient concentration from 1/4th, 1/2 and then to 1X Hoagland's. Any explanation for this?
It is an accepted practice to express the nutrients in fertilizers as percentage of nitrogen (N), phosphate (P2O5), and potash (K2O). We know that plants do not take up these nutrients in any of these forms, and this practice is being continued because of some historical reasons. In olden days, plant ash analysis was the major procedure for studying plant nutrition, and scientists, while analysing plant ash for various elements, observed that when these elements were expressed as oxides, they summed up to 100 percent indicating total analysis. Consequently, it became a practice to express various plant nutrients found in plant ash in oxide form (P2O5, K2O, CaO, MgO, etc.). Other elements that may not be present in plant ash are expressed in elemental forms only ( Examples, nitrogen ( N) and sulphur (S). This system has been accepted by the fertilizer industry to express grades of all fertilizers.
My question is: Why are we continuing this odd practice still now?. Why don’t we opt to express all the nutrients in elemental form?
Dear all, we are living in a changing world – caused by climate change, pollution and shortage of resources. That’s only the half of it. The inverse side is: We are watching an incredible development of completely new possibilities in science and technology, also in agriculture. Some Key words: Artificial intelligence, big data, precision farming, spot farming, nanotechnology, gene engineering and more. How can these new opportunities help us solve the problems caused by climate change, pollution and shortage of resources to secure nutrition of humanity? What results from this for current requirements in applied research in plant nutrition? And what does it mean for teaching at university to make agriculture students fit for future in research but also in agricultural practice?
Kindly assist by sourcing for laboratories that are working on plant nutrition and drought tolerant for Research Fellowship.
I am an Associate Professor, Plant Breeding and Genetics in the Department of Agronomy, Federal University Gashua, Gashua, Yobe State, Nigeria.
My research focus is maize breeding on quality protein maize, nitrogen use efficiency and drought tolerance.
I'm currently working on how plants can find carbon sources for their metabolism, except from photosynthesis.
I found cases of mycoheterotrophic nutrition in non-chlorophylic plants and orchids, where plants build a parasitic relashionship with mycorrhizal fungi. Could other plants, like the cultivated ones, or trees, use mycorrizal nets for carbon nutrition from time to time, even when they could realize photosynthesis ? In other words, is non-clorophylic plants way of surviving a new function they developp, or is it a "natural" way of doing for every plant that they push to the extreme ?
Another case is the one of Quercus ilex, that would establish a temporary mycoheterotrophic nutrition, in spring when the root stocks are depleted and the leaves are not grown yet. Is there any study about it ?
I've already red the work of Garbaye J. 2013. La symbiose mycorhizienne. Une association entre les plantes et les champignons. éd. Quae. pp 70-88, 102-105. and work of Marc-André Sélosse.
Thanks for your answers.
How is plant nutrition being affected since the widespread use of highly soluble synthetic fertilizers to more complex, organic soil amendments, that are typically applied on organic farms?
Can plant growth-promoting bacteria produce hormones inside the plant that have a role in plant nutrition
I would like to know what is the significance of symbiotic relationships in plant nutrition.
Do we have evidences suggesting that symbioses have a significant potential to improve crop yields and quality ?
Especially about mycorrhizae, do you know to what extent they could contribute to plant nutrition? with examples for crops, or records in "nature".
Do we have an idea of the magnitude of the contribution ?
Could it play an important role with a little more selection and innovation?
Or is it just something that ecologists like to point out but have no interesting technical applications.
I guess the answer is somewhere in between ...
A field study of 4 levels of biochar (Factor A) and 4 levels of nitrogen fertilizer (Factor B) ; (16 treatment combination) is underway. Field study was set up in RCBD and replicated thrice, however i have a problem in selecting statistical model to use for data analysis.
I intend to use the general linear model (GLM), but i am not so sure if the model is the best fit for analysis. I need suggestions and guidance.
Is There a simple method to prepare the extract of leaf, stem and root in order to estimate Na, K, Ca, Mg, Mn, Zn, Fe.
Thank you for your contributions
I am working on management of soil phosphorus for nutrition of groundnut crop in different soil types. I am interested to know about all possible chemistry of soil phosphorus in different type of soils.
What would you comment on the observation that shoot magnesium concentration in one plant species is significantly higher than its sympatric sister species at any nutrient supply rates? By the way, concentrations of other elements including N, P, and K all show an opposite pattern.
What are the right timing of fertilizer application on the bittergourd? when to apply? and crops stand of plants to apply?stages of plants the best to apply fertilizer?
I am going through a project on the contribution of litter-fall towards the nutrient supply in high density peach orchard. I have to determine the nutrient contents in the fallen leaves. But, I have little knowledge on the fact that what will be variation in nutrient contents in the litter-fall as compared to normal leaf sampling period in peach. The normal leaf sampling period for determining leaf nutrient status in peach rages from 8-12 weeks after full bloom. Please, help with some published documents and literatures.
I am focusing on comparing the Boron and Zinc supply conditioned primarily by the soil types: Fluvisol in lowland and Acrisol in the upland and determine the demand of B and Zn by vegetables like tomato and cauliflower and cereal i.e wheat. I want to know what will be the standard methods to calculate the water requirement for pot and field experiment.
For instance, at low external concentration the uptake rate of cation is not affected by the accompanying anion and vice versa. On the other hand at high external concentrations an ion which is taken up relatively slow can depress the uptake of an oppositely charged more mobile ion.
By the application of phosphate fertilizers,band close to young plant root because only 20% of applied phosphate are use by plant. Also it application should not be in excess because it can cause micro nutrient deficiency such as zinc.
Plant microbiome always used to be associated with various physiological attributes of the plant. I want to know, does it influence the quality of the produced fruit? Can it be a reason for a variation in quality attributes of a single variety grown in different ecological condition? So far everyone knows that, the varietal features with combination to the edaphic conditions of growing environment determines the fruit quality. Apart from this, is there something else to regulate fruit quality?
Why Ca2+ ions are reported as very little mobile in xylem and needed to be with some others ions like nitrate to be assimilated by the plant ???
I conducted a greenhouse experiment recently that involved rearing corn plants in a calcined clay medium (Turface) and Long Ashton solution. Despite fertilization with Long Ashton 3 times a week, our plants all had low N (1-3% N by dry mass). Even more strangely, N as well as several other nutrients (S, Mn, K, Mg, and Na) were negatively correlated with plant height. All other micronutrients were neither deficient nor excessive. Would anyone know how our growing conditions might have caused this odd negative correlation between plant growth and nutrient composition?
I am interested in studying dark induced senescence of leaves of hydroponically grown Arabidopsis plants. what age will be ideal to induce senescence and what method would be applicable to induce dark senescence; either by leaf covering or whole plant covering?
Does anybody has previous experiences of dark-induced senescence experiment in Arabidopsis?
I'd like to have your ideas.
I want to know how to differentiate the spectral profile of Tea from other Land uses. Is reflectance of tea leaves have any distinct qualities in NIR region than other vegetation, forest , soil and water?