Question

figure shows the two crops field ( plot a and b )have been treated by manure and chemical fertilizers respectively keeping other environmental factors same observe the graph and answer the questions that follow

A . Why does plot b show sudden increase and then gradual decrease yeild?

B. Why is the highest peak in plot a graph delayed?

C. what is the reason for the different patterns in the two graphs?
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Answer 1

Answer:

With addition of chemical fertilizers there is sudden increase in yield due to release of nutrients N, P, K etc. in high quantity which are absorbed by the roots quickly. The gradual decline in the graph may be due to continuous use and high quantity of chemicals which kill microbes useful for replenishing the organic matter in the soil. This decreases the soil fertility