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 below:
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Organic matter reduces P fixation.
Forms phosphohumic complexes.
Increases P availability and use efficiency.
Both A and R are correct and R is the correct explanation of A
Both A and R are correct but R is NOT the correct explanation of A
A is correct but R is not correct
A is not correct but R is correct
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The Correct Option isA
Solution and Explanation
Step 1: Understanding the Concept:
Phosphorus use efficiency is low due to fixation.
Organic matter can improve phosphorus availability. Step 2: Key Formula or Approach:
No specific formula.
Need to understand P fixation and its reduction. Step 3: Detailed Explanation:
Integrated use of phosphatic fertilizers with organic manure reduces P fixation.
This increases P use efficiency.
Organic matter forms phosphohumic complexes.
These complexes are easily assimilated by plants.
Organic matter also forms coatings on sesquioxide particles.
This reduces P adsorption.
Thus, both A and R are correct, and R explains A. Step 4: Final Answer:
Both A and R are correct and R is the correct explanation of A.
Hence, the correct option is (A).
