How to determine P application in soil, if DRIS based optimum nutrient requirement is P (7 - 9 mg/kg)?

01 January 1970 1 5K Report

DRIS based optimum requirement showed 7-9 mg/kg P. How much quantity of P2O5 should I apply to fruit trees in g/tree?

Interesting question . but , why to establish optimum requirement through DRIS , have you validated this value of optimum P through field data. you need to develop a soil test-crop response data base equations to to arrive at such figures. Morever , you need the target soil p value , how much increase you want to gain from 7-9 mg/kg to what level and increase in yield from what level to what level...

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