Question
Given below are two statements, one is labelled as
Assertion A and the other is labelled as Reason R Assertion A: Integrated use of phosphatic fertilizers and organic manure/crop residues increases P use efficiency by reducing P-fixation in soils. Reason R: Decrease in P-fixation in presence of organic matter in soils may be ascribed by formation of phosphohumic complexes that are easily assimilated by plants and formation of coating on the surface of sesquioxide particles. In light of the above statements, choose the most appropriate answer from the options given belowSolution
P is an element that is prone to fixation ins oil that’s why  its availability gets reduced. Its fixation in the soil can be reduced either by band application which ensures its lesser contact with soil particles or application of organic manures which form phospho-humic complexes which are easily assimilated by plants and formation of a coating of sesquioxide particles along with this Integrated use of phosphatic fertilizers and organic manures increase P use efficiency by reducing P-fixation in soils
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