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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.

Text Solution

Verified by Experts

The difference in the two graphs indicates that use of manure in case of plot A, is beneficial for long term and durable yield. It tends to remain high even when the quantity of manure increases. In case of plot B, the chemical fertilisers give immediate and better yield but cause various problems when used continuously for long time. Loss of microbial activity reduces decomposition of organic matter and as a result soil fertility is lost, hence durable yield is not possible.
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