Q2. Figure 15.1 shows the two crop fields (Plots A and B] have been treated by manures and
chemical fertilizers respectively, keeping other environmental factors same. Observe the graph
and answer the following questions.
1)Why does plot B show sudden increase and then gradual decrease in yield?
2) Why is the highest peak in plot A graph slightly delayed?
3) What is the reason for the different pattern of the two graphs?
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A . the chemical fertilizers are harmful for the soil and as a result of this the yield of the crop decreases with time.
Explanation:
B. the height of the curve is slightly delayed because the amount of nitrogen and phosphorus which is present in chemical fertilizers is more than that of the manure and hence the growth of the plant is also enhanced by chemical fertilizers.
C. for the long-term the manure is more important than the chemical fertilizers for increasing the fertility of the soil , however for short term the chemical fertilizers increases the yield much more
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