[Both 1 and 3.] The productivity in the Indian agriculture has stagnated since 1990’s although the usage of fertiliz

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The productivity in the Indian agriculture has stagnated since 1990’s although the usage of fertilizers has considerably increased since then.
What is/are the possible reason/s increase in the productivity cannot come through increase in the usage of fertilizers.

Unscientific usage of fertilizers.

Agriculture productivity in India has reached a zenith position and any further

Increasing monsoon vagaries because of Climate Change.

Both 1 and 3.

Explanation:
Unscientific usage is the main reason ie unbalanced dosage of nitrogen, phosphorous,potassium. In the ideal condition it should be 4:2:1. But in India it is completely unbalanced .Based on region the ratio of N:P:K varies in a big way eg: all India it is 8.2:3.2:1, for Punjab itis 61.9:19.3:1, for Haryana it is 61.4:18.7:1. This can have negative impact like decreasingthe soil fertility and thus reducing the yield. Monsoon vagaries definitely has increased withtime.

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