Question

figure below shows the two crops field (plot A and plot B) have been treated by manures and chemical fertilizers respectively keeping other environment factors same observe the graph and answer 4he following question
1 why does the plot B show sudden increases and the gradual decrease in yield
2 why is the highest peak in a plot A graph slightly delayed
3 what is the reason for the different pattern of the two graphs ​

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.

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