At what level a micro or macro nutrient (quantitatively)( with reference to nitrates, phosphates, potassium etc.) is important or beneficial for the proper growth and development of crop and above which it becomes toxic for the growth of plants or crops
I agree with Mr. Farid Benyahia. Here there is no absolute level of macro and micro nutrients. It may vary from species to species. (plant)
Agreeing to what has been suggested above. Please have a look at enclosed PDFs . Kirti , if you grow a single crop on a variety of soils, you will need those many optimum limit of soil test values for different nutrients ...depending upon the yield you are getting and the yield level you target at...
These are arbitrary values which vary from species to species and also with soil type,season and rainfall pattern.However one thing is for sure that soils having high organic matter are always enriched with all desired nutritional content in ample quantity.Hence before going to start have look on this aspect.Soils rich in organic matter seldom need an external application for short terms as they have ample Quant ity of primary and secondary nutrients which is sufficient enough for 2-4 years.
Optimum level of macro-or micronutrients with respect to a crop , when you evaluate are always associated with the maximum productivity , regardless of stage of crop . Some of the concepts like DRIS, Ionomics, Boundary Line Conecpt , Compositional analysis etc have been proposed from time to time , only to neutralise such interfering factors . Considering nutrient ratio is one such revelation ...
Optimum levels of these two groups of nutrients vary with respect to crop , growing stage , soils, environmental conditions , so , we can depend on many criterion like DRIS to determine this issue.
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