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The figure shows two crop fields (plots ...

The figure shows two crop fields (plots A and B) have been treated by manures and chemical fertilizers, respectively, keeping other environment factors same. Observe the graph and answer the following question:

(i) Why does plot B shows sudden increase and then gradual decrease in yield ?
(ii) Why is the highest peak in plot A graph slightly delayed?
(iii) What is the reason for the different pattern of the two graphs.

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