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

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