Questions related to Crop Physiology
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.
In between Genetic and plant breeding, plant physiology, agriculture biotechnology and plant pathology which one subject have maximum contribution in crop improvement? Which one is better for research?
I am analysing physiological data (transpiration rate, biomass production, silica content…) coming from plants cultivated in an experimental field with the aim of understanding if (1) water-treatment; (2) species; (3) variety have an effect on the silica content of leaves samples.
I would like to know an extra opinion on some issues: (a) can the experimental design (explication below) be considered a split-split plot design? If yes, is it correct to consider the block as the one year-experiment, the pplot as the treatment, the splot as the species and the ssplot as the variety? Do you have some suggestion to implement this design in R considering I have available, so far, only the data coming from one replication (one year of experimental field)?
Each plant grew inside a lysimeter (a cylindric tube placed inside a concreate pit which allowed me to control the water regime and the transpiration rate while it simulated the real field conditions as for example the soil profile). I am investigating 3 crops: Sorghum (S), Pearl millet (PM) and Finger millet (FM), 10 varieties for each crop, and I tested 2 different water treatments for each crop: water-stress (WS) and the control well-watered (WW). For each treatment I tested the same 10 varieties with 5 pseudo-replicas for each variety. I organized the field (file attached) into 6 plots: 1. FM- WS, 2. PM-WS, 3. S-WS, 4. FM-WW, 5. PM-WW, 6. S-WW. Each plot was filled with 50 cylinders (10 varieties x 5 pseudo-replicas) divided into 10 rows. The 50 plant-samples have been randomize separately (each plot has its own randomization). Therefore, in each plot I tested simultaneously 3 variables: (1) treatment; (2) species; (3) variety: each plot is characterized by 1 treatment and 1 species and 10 randomized-placed varieties and treatments have not been mixed in the same plot.
My data for fungicide treated replication shows higher RMSE and R-square but less CV compared to the untreated replication for a regression between vegetation indices and yield. How correct is it? Both the replications had 49 genotypes of wheat.
Green beans were infested with rhizoctonia Solani though not sure what AG is
Said this because nothing is really reliable when artificial inoculation happens and the three points triangle is really a matter of circumstances in that case
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?
Is it possible that, plants with a better vegetative growth can show lower reproductive growth, whereas, plants showing lower vegetative growth can give a better reproductive growth? Let me explain, If we get a better vegetative growth but lower reproductive growth from application of fertilizer with higher available N, and vise versa from application of fertilizer with less available and slow release N, then is it meaningful to say that, in case of fertilizer with higher available N, N is immediately assimilated in development of vegetative growth leaving little for reproductive stage and thus showing a lower reproductive growth? On the other hand, in case of the fertilizer with less available N and slow N release, N becomes available during reproductive development, resulting in lower vegetative growth but a better reproductive growth.
My query is based on our findings on crop growth experiment, but I am not very sure how to explain these. Can anyone please help me with the possible explanation for such results?
- Plants in the controlled conditions grow isolate but its not the same case in field.
- Volume of soil available to the roots within a pot is considerably smaller as compared to field condition.
- Volume of water and amount of nutrients is also less.
In animals, small and weak often feel stress from the tall and strong ones?
so, in plants, did they could feel the differences, except for they will competing for CO2, water, nurtrion and fertilizer.
Rootstocks are considered as the major via- medium for regulating the performance of scion with regard to whole range of parameters , starting from simple growth to multiple resistance against pests and diseases , besides expending the harvesting window of scion. In a combination of compatible rootstock-scion , no genetic transformation takes place either mutualistically or otherwise , it is simply the characters of rootstock in question , translate into the performance of scion. What do you think , when such permanent changes do not take place in such combination , how come , the flow of various signals takes place from rootstock to scion and vice-versa , much to the benefit of scion only .
I have been using the AquaCrop model since its introduction with version 3.1. I have recently modeled some potato cultivars subject to deficit and full irrigation in a dry and hot climate in south of Iran. I used the latest version 6. Based on my several experiences in calibration and validation of the AquaCrop model (trial and error approach to calibrate the model), I have some suggestions for the model developers in order to improve the model performance in its the future versions.
We know that the AquaCrop model is basically developed for simulating irrigation managements, and it is a water-driven model for simulating yield and biomass of field crops. Incorporating more parameterization options that consider the physiology of crop would help for more accurate simulation. Below I would like to share my thoughts with those who are interested in modeling with AquaCrop and have experiences with it or are going to use it in future. I would be happy to learn from you and your experiences in what has been reflected below, or other options based on your experiences.
1) I think that the latest version is good for no water stress but still it needs more improvements for simulation under water stress, especially in hot and dry climates with high VPD (>3-4 kPa). Maybe some deficit irrigation in moderate and temperate climates (low to moderate VPD) would still provide good conditions for simulation of deficit irrigation. I think that VPD plays a major role when we simulate deficit irrigation levels (mild, moderate, severe).
2) The model still has shortcomings in modeling senescence and it is not able to physiologically simulate senescence particularly under high water deficit. The model cannot match well the biomass and yield accordingly. In such conditions, soil water is not simulated so good as the ones in earlier times of growth period.
3) It is better to allow the user to assign multiple values of calibrated WP* during the growing stages instead of just one WP*. This is most important for the later stages for biomass simulation, and assigning a single calibrated WP* may not allow full performance of the model when crop mature. At least 2-3 WP* values should be considered depending on the length of growing period.
4) The interaction of water stress and heat stress is very important particularly in the arid and semi-arid areas where climate change may have higher sever effect on crop physiology. For example, for tuber crops such as potato, secondary growth may happen in later time of the season for which biomass may jump after the crops have experiences high heat and water stress during the middle of growth stages.
5) The recommended WP* ranges for the C3 and C4 crops as outlined in the manual andthe model may not work well in hot and dry climates and deficit irrigation practices. For potatoes we chose calibrated values below the recommended one, and also in a very recent publication (Agricultural Water Management 203 (2018) 438–450), the authors have assigned WP*=21 for seed production of maize (C4) under full and deficit irrigation that is far below the recommended one. Therefore, it seems that in hot and dry climates WP* is lower than the recommended values for both C3 and C4 crops specially if crops are subject to deficit irrigation.
Thank you and look froward to hearing more from the other AquaCrop model users!
Available theories and papers suggest that increase in grain starch content and decrease in grain protein leads to a higher grain yield. But, what might be the reason for high grain yield in few corn and sorghum genotypes with high grain protein and slightly low (below average) grain starch content?
We have been trying to extend soybean in northern Bangladesh in Kharif II (Avg. Temp 30-35°C) and Rabi (Avg. Temp 18-25°C) seasons for several years. We are getting fluctuating yields often due to variations in environmental and climatic factors. We need to choose a suitable variety of soybean. We have come to know that crop heat unit (CHU) indexing system is used in temperate countries like Canada to select suitable crop varieties for a region. We are trying to find out whether such a system can be used in the subcontinent.
We would like to know:
· Can this system be appropriately adapted for tropical and subtropical countries?
· Is such a system in use India or any other country of Southeast Asia?
· Can this system be used to select crop varieties to avoid heat damage of excessively hot periods of summer?
· In case this system is used in this region, what are crop heat unit (CHU) values for different soybean varieties?
I really need an assay(s) that can test how efficient a plant is using water? Thus far, my method for measuring this have been by using a porometer, and a simple assay where you put plant cuttings in a tube and measure how much water they remove (via transpiration).
I have several compounds that I need to screen to see if they help plants take up water more. I'd be great if there was a simple assay out there that could do this.
All thoughts/ideas/comments are welcomed!
Could same plant species collected from different environmental conditions - relative humidity, temperature, water stress, atmospheric carbon dioxide etc. vary in their stomata/trichome densities? Which is expected to have higher stomata/trichome densities - the less or extreme condition?
Salt toxicity is a common problem in high pH saline soils. The problem is aggravated by applying poor quality underground water to fruit plants.
The paper should deal with physiology of modern corn and sorghum cultivars. How it differs from physiology of traditional corn and sorghum? I am in need of few papers related to the above mentioned aspect.
We are interested in measuring the light availability for coffee plants under a range of different adaptation practices (shade, cover crops etc). We want to ensure that the measurement can be automated (i.e. a sensor that can be left for a number of months) and covers the three relevant aspects of light for plant growth. That would be quality (the wavelength), quantity (intensity/concentration) and duration.
Does anyone have any recommendations based on their research?
Many thanks for any advice
Some species are resistant to high levels of aluminum in the soil. Tea (Camellia sinensis) has this ability in very acid soils where ion pairs "Al-P" are formed and absorbed by the roots.
Tea can accumulate aluminum by complexification with organic acids and flavonols and also benefit phosphorus absorbed with him. This phenomenon of absorbing "Al-P" pairs also explains the stimulatory effects on growth of low alumium levels for many crops.
we are working on improving salinity tolerance of crop plants using exogenous application of silicon. i would like to know the normal range of the concentration of silicon in crop plants?
I am looking for some information on the effect of doubled haploids on inbreeding depression in crop plants. Attaining homozygosity through several cycles of selfing leads to inbreeding depression in many crops. What is the inbreeding depression observed in plant made homozygous through anther/microspore culture? Haven't had much success in finding relevant literature through web search. Any help/guidance will be much appreciated.
This is one of the treatments in a factorial experiment involving different species, drought and fire. Any ideas on a fire protocol that might work best will be highly appreciated.
In short rotation tree crops for industrial use in agroforestry need to develop a growth models for comparison of growth in sole plantation and in under agroforestry plantations. What are the essential parameters to be monitored or variables to taken for development of growth models of such tree species.
I developed some summer onion mutants. These mutants produce sufficient roots when grown in winter. But when these are grown during March and onward, they produce very little roots which causes severe seedling death after transplanting. To suggest the grower I need cheap and available source of hormone/substance so that the grower can afford the cost and get easily in the market; parallelly which can enhance rooting to check seedling deaths.
I am working with a group of kiwifruit orchards that have leaves with severe chlorosis. The leaf iron is very high at 240ppm, Manganese, magnesium and nitrogen are all in the normal range. The symptoms are identical to severe manganese deficiency. The irrigation water has high Bicarbonate content.
Suppose LAD values calculated based on leaf area index values are 70.6, 80.2, 50.8, 90.7 for greengram genotypes g1, g2, g3 and g4 respectively and expressed as (m2/m2). days. Whether I should keep the units or not in the table. How the above values could be explained?
How can I estimate the physical loss of standing crop residue (like rice or wheat or maize) from the soil surface from a no-till plot?
which physiological process does the wild species of our food crops had, C3 / C4 / CAM physiology ?
I have came across some publications about CERES, AFRCWHEAT2, WE models. But other crop models, for example STICS and APSIM, have also module for phenology simulation. Is there a nice review about this topic?
I want to test the pollen viability against heavy metal stress. If you can send me a low cost simple protocol, I would like to test it.
Webworld of microbes in soil fertility transformation is distinctly visible on various kinds of crop responses. But , responsiveness of such microbial inoculation is often claimed to be bit time consuming . And annual crops are often debarred from such benefits compared to perennial crops. Very often , we keep talking of source specific microbes, crop specific microbes, native microbes and so on ...In this background, i have few very pertinent quarries to be responded by my learned colleagues . These are as follows:
* How far soil microbes compare with plant endophytic microbes?
*Is there any crop specific study to establish the superiority of soil microbes over plant endophytic microbes and vice-versa?
* Is there any tissue specific microbes more accountable to crop response?
* What kind of microbes are more favored in studies on plant endophytic microbes?
* What kind of inoculation procedures should be adopted for plant endophytic microbes?
* Is there any possibility of having plant endophytic microbial consortium for elevated crop response?
I made an experiment with several tomato cultivars. I measured chlorophyll content at one middle leaf by using SPAD 502. The result showed that plant with dense leaves (high number of internodes) had lower chlorophyll contents compared to the ones with less dense leaf (Lower number of internodes).
DSSAT/INFOCROP to a limited take care of the soil conditions as influenced with tillage and other management options.
Lot of work has been done in recent past to evaluate effects of zero/minimum tillage, bed planting, other RCTs on suggesting management options and also assessing growth and yield of crops.
Transfer functions generated to a limited extent, long term consequences missing to a greater extent.
we need to include these transfer functions within the body of the crop growth model, or evolve a simple soil health module to include the mediated effects
some work in understanding of the entire system, which subsequently aids in developing a sub-routine
I have worked on a tomato variety trial and it might not be possible to harvest tomato plants and oven-dry them to determine above ground dry matter due to too many tomato plants. I am wondering if it is also possible to calculate Harvest Index by using fresh weight, considering that we also consume tomato fruits in fresh.
DEAR ALL, i going to use sago - gelatinized edible starch powder as geling agent in potato micropapogation give any refrance or suggestion were well come ....also i need suppler of same from india...
Source-sink relationship What are the main factors determining the source capacity in legume crops at flowering stage?
In a citrus rootstock trial planted in South Australia in 1997, the combination of Navelina 7.5 (Spanish clone) on C35 citrange started to fail after around 15 years. Of the original 9 trees, 7 have died, and the 2 that are still alive are in poor health. They show a clear crease under the bark at the bud union, indicating incompatibility (see photo).
These are some of the oldest trees of this combination in Australia, but I have been told by some in the industry that reports of a similar problem have emerged from overseas, although I can find no literature to confirm this. Can anyone provide a published paper, or failing that some unpublished information showing this problem happenning elsewhere?
I would like to find a good function to fit kinetic data of leaf senescence (few and meaningful parameters). So far I have chosen a Gompertz function to explain green area index over thermal time. Do you use the function properties (Gompertz or any else), or do you estimate senescence onset as the time for an empiric percentage of senescence threshold?
Applying fertilizer along with maize seed planting, would it be a best strategy of applying the fertilizer for efficient use of the maize seedlings since the maize plant is monocotyledon? what happen to the endospalm of the seed?
Gas exchange of water vapor and CO2 are controlled by stomata. In many plants, when CO2 increases, there is a reduction of stomatal conductance.
But many species are known to grow more when Co2 increases. How do we reconciliate the two facts ?
The tree is oil palm ,and I know it depends on the age of the tree and the extend of the root ,but I want to know when is the best time for sampling leaves to determine whether the amount of fertilizers applied was enough? Do we have any role for that?
I want to take a picture by satellite and UAV to compare between nitrogen content in aerial images and ground data that's why I want to know when is the best time for leaves sampling after applying nitrogen in soil. generally not exactly
Thanks in advance.
what is the effect of phosphorus and potash application on day to tasseling, silking and physiological maturity of maize crop?
please attach the research paper with the response.
Contamination is rare on plates and morphological characteristics are also as usual Rhizobia but chemical test making me ambiguous. Can you help me by giving any helpful information.
CRD in factorial experiment ..4 sesame land-races and one improved drought tolerant variety +3 drought stress levels (0%; 5% and 10% PEG Mr 6000) replicated 4 replications.
what amount of PEG will i need and other essential apparatus to complete this experiment?
what step should i take from step one to produce significant results,especially the how to mix culture media and PEG?
Regular application of fertilizers to annual crops will give immediate response as well as returns. With respect to perennial crops like mango, cashew and sapota etc., application of fertilizers at regular intervals are not giving immediate response as well as returns why it is so?. Based on my experience in cashew, no significant difference was observed with respect to yield with application of fertilizers and without application of fertilizers. Then i have collected the biomass of the well matured cashew orchard and weighed. Around 5 tonnes of cashew biomass collected from one hectare area. Then started analysing the nutrient content of the biomass and observed that enough nutrients are available in that biomass for meeting the requirement for cashew.
For the first time it looks like herbicide damage. Young leaves growth retardation and yellowing have been noticed at the same plot last year, but at later stage of plant development. This year, the symptoms appeared after transplantation. There was no any herbicide applied here at least for last 3 years. Water for irrigation is obtained from underground sources. Soil is rich (Krasnodar black soil region).
In chickpea crop production, there is wet substance which appears on leaves called axalic or maleic acid, the question is, are there any genotypic differences in the production of oxalic acid and maleic acid? 2. Do management practices affect the production of these acids? 3. Do these acids have any beneficial effects on the plants themselves?
Tomato hybrid plants show slight yellowing and deformation of younger leaves. The symptoms occur from seedlings to maturing stage. Affected plants grow slower. Is it mild virus or genetic feature? It has no relation to my previous question...
The symptoms shown in the slide appear only after approx. one month during storage (not in the field) and only on the peel and not in the fruit flesh. Therefore it cannot be due to calcium or boron deficiency. Any idea ?
Now I research about if different crop system could affect herbivore induced plant volatiles like methyl salicylate effeciency for attract nature enemies.
Does anyone know the paper about it, thanks for your help?
Plant nutrition research very often neglects the most important aspect of change in shelf life of fruits in response to nutrient composition of edible part . We always believe that an improvement in plant nutrition will expunge the free radicals accumulated in the fruits while storage . And , the abundance of dismutases as a function of nutrients like Fe, Zn , B, Ca could come very handy in scavenging the excess presence of free radicals , thereby , resonating the palnt defense tool to become doubly active in offering the extended shelf life of fruits . Unfortunately , there are miniscule evidences on these aspects . I , invite researchers worldover to express their take on the subject .
Source to sink distance varies among species. Please explain its effects on the yield of plants. If there is some reference, it would be helpful for me.
What compounds/measures/characteristics determine the quality of Pinot Noir grape berries? Brix+ph+titratable acidity are pretty standard, but what else influences the decision to harvest?
Xylem and phloem pH might differ among species and environmental conditions. Is this pH affect the mobility of nutrients within plant body? If Yes then Why... Explain please....
Many exotic plantations are being promoted in wet lands particularly close to paddy-rice agroecosystems. It will be interesting to know the possible impact of popyphenols on the morphology, physiology, energy partitioning and molecular level.
a colleague is interested in assessing yield penalty for groundnut cultivars having multi resistance to diseases such as leaf miner, rosette, leaf spot, and tolerant to drought
Considering the crisis in availability of irrigation water in future, even in South Asian countries, rice production should be made in system (s) where water requirement is less; for example, aerobic method of rice cultivation consumes less water; however, the nature of variations in crop physiology due to the shift from anaerobic to aerobic rhizosphere is not understood clearly.
In wheat crop, usually we observe that the middle seeds in the spike are bolder compared with the grains on the top and bottom of the spike. What are the genetic and physiological reasons for this phenomenon? Explain please.....