To achieve the least benefit of the weed from the chemical fertilizers added to the agricultural crops and not to obtain adverse results in terms of increasing the growth of the weed as well as increasing its competition for the crops.
It is preferable to know the best times of adding them to achieve the best utilization of the crops to the best yield and quality.
Nofel Issa, which crop are you referring to?The type of crop has implications on how and when you apply the inorganic fertilizers. The type of chemical fertilizer too!
The general rule, however, is that most weeds tend to outcompete crops for water and nutrients. This means inorganic fertilizers should be supplied to a weed-free crop field i.e immediately after cultivation.
This information could be useful
Mengel, K. Responses of various crop species and cultivars to fertilizer application. Plant Soil 72, 305-319 (1983). https://doi.org/10.1007/BF02181970
K. Mengel, B. Hütsch, Y. Kane. Nitrogen fertilizer application rates on cereal crops according to available mineral and organic soil nitrogen,
European Journal of Agronomy, Volume 24, Issue 4,
2006, Pages 343-348.
Useful links:
https://www.researchgate.net/post/What_do_you_think_about_using_of_the_chemical_fertilizers_and_pesticides
https://www.jica.go.jp/nepal/english/office/others/c8h0vm0000bjww96-att/tm_2.pdf
http://sri.ciifad.cornell.edu/extmats/engmanual.pdf
https://www.britannica.com/technology/agricultural-technology/The-economics-of-fertilizers
Please use a split method (50% during planting and 50% after 20 days of planting I.e at first stage weeding time).
If you are only looking to have the lowest effect on the weeds you should do it during the cultivation since the crop is bigger and therefore can uptake more nutrients.
However this may not lead to the highest yield. The crop already needs fertilizers from the start. So a split like suggested before would be a good balance between trying to avoid uptake by weeds but have a good growth from the begin for your crop.
It would also depend on the fertilizers that you use. Are they slow release fertilizers or organic fertilizers then they should be added before planting or at the start.
Chemical fertilisers are applied depending with the soil test results and type of crops.
-Basal fertilisers are applied before or during planting
-top dressing fertilisers are applied during different stages of plant growth
- foliar application of chemical fertilisers applied during different growth stages
The rate and method along with stage of crop would be decide to apply fertilizers. It is better to apply fertilizer through deeper placement before sowing, and band placement after sowing at vegetative stage, foliar after herbicide application (10-15 day after) and do soil solarization after harvesting if suitable.
Hi!! Let me try to answer. It depends on seasons and it is better to work in collaboration with local farmers. I wonder for example if the application time for chemical fertilizers is the same in US compared to China or other places of the world. Thank you.
Nitrogen besides P is the most important nutrient governing growth/yield of the crop as well as of the weed (depending on weed species). It is therefore important to apply N at a rate and timing favouring more the crop than the weed. Pre sowing N fertilisation rate may stimulate more the growth of the crop than of the weed.Banding N/NP fertilizer with the seed makes it less accessible to weeds during the early growth stage and crop establishment. The aim should be to maintain a good local balance between crop and weed without relying completely on herbicides, because weeds are a fundamental factor in promoting biodiversity in agricultural systems. Weeds will support insects and finally also birds.
This depends on the type of fertilizer (slow or fast dissolution) and the degree of reaction that affects the readiness of the fertilizer, the needs of the crop and the soil texture.
Chemical fertilizers can be applied on the critical stages of the crops during the cropping period and after providing weed free environment by hand weeding or chemical or mechanical weed control in the cropped field. The phosphatic fertilizers should be applied before planting or sowing of the crop as basal dose.
Dear Mr. Nofel. Depending on the type of crop, the method of cultivation and the competitiveness of the crop .
Dear Mr. Nofel. Depending on the type of crop, the method of cultivation and the competitiveness of the crop .
Dear Mr. Nofel. Depending on the type of crop, the method of cultivation and the competitiveness of the crop
Chemical fertilizer applied should be at critical stage of crop growth and after removing the weeds from field. another things is that seed germination does not affected by fertilizer application, germination depends on food storage in embryo of seed. So my suggestion is that fertilizer applied at critical stage of crop, at this stage crop used maximum fertilizer and compete better with weed.
Chemical fertilizers should be added depending on,crop growth stage,climatic conditions and the crop type.
I believe, fertilizer management is more focussed on the main crop rather than the weeds. Weeds need to be controlled by appropriate strategies so that nutrients applied through fertilizers are used efficiently by the crop.
The critical period of weed control in a crop like maize or soybean is the first 40 days weeds that emergance after that are not effective in their competition and the peak yield can be promoted.
When mechanical methods are used same period 30 40 days can be used to apply supplemental nutrient in the form oa soluble synthetic fertilizer and this will give the nutrient availability for the peak need and use in the vegetative stage.
Prior to the last critical stage weeding the fertilizer is applied and the the cultivation can incorporate the nutrient into the soil to lower the nutrient losses.
In the nechanical approach this gives a piling of the soils around the crop which is best planted on raised contours.
This type of systematic approach can optimize the input efficiency while integrrating the fertilization and management sttrategy efficiently.
The other keep idea is to utilize the soil testes to tailor the type of fertilization needed considering the different needs in different field sectors.
This can be done by eyeing the gtowth in the field and analysis is also uselful.
The use of starter fertilizer is the most efficacious for stimulating response per unit of application.
The phosporus component is particularly important to stimulate the initial growth and rooting. The starter can applied 3 to 5 cm to the side and befow the seed placement.
5 20 10 NPK can have amazing effect in terms of the kg/ha application.
In a maise crop such an application can give about 80% of a 120 50 120 application.
For both soybean and maize micronutrients can included in the starter and in the case of soybean nitrogen would be omitted but Rhizobia would be recommended as a seed treatment.
Each crop has a suitable time to add fertilizer according to the growing season. The use of fertilizers as recommended and not being extravagant may be reduce of the weed pupulation
It is better to add fertilizers after emergency and when targeted crop have well developed root system to reduce competition of weeds which could have well developed root system.
It is added before planting as a stimulant initiator of the soil (catalyst). It is also added during planting a month after the planting process, for example, adding urea fertilizer in three batches, the first batch after a month has passed from the planting process and the second batch after a month has passed from the first batch and the third batch after a month has passed from the second batch This is for the purpose of supplying plants with nutrients during the different growth stages.
The band application of fertilizers at fixed gap periods, having enough to nearly dry soil moisture conditions can be the better way to control weed competition for nutrients. By this practice precision application of fertilizer is sufficient for better and timely crop growth and yield.
le meilleur moment serait après contrôle des mauvais herbes au stade de croissance végétative où la plante sollicite plus d' éléments nutritifs pour développer les organes reproductifs
- Right fertilizer source at the
- Right rate, at the
- Right time and in the
- Right place
- https://nutrientstewardship.org/4rs/
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