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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

Sudden increase: Chemical fertiliser supplies the minerals immediately in good quantity. Gradual decrease: It is due to depletion of nutrients caused by absorption by plants, leaching to lower layers of the soil and killing of decomposer microbes.
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Figure shows the two crop fields [Plots A and B ] have been treated by manures and chemical fertilisers respectively , keeping other environmental factor same . Observe the graph and answer the following question. (i) Why does plot B show 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 graphs ?

Why are manure and fertilizers used in fields?

Knowledge Check

  • Refer to the given graph representing two crop fields X and Y that have been treated by different types of materials for nutrient replenishment, keeping other environmental factors same. Select the incorrect statements regarding these crop fields X and Y.

    A
    Materials used for treating crop field X could be organic substances while those used for Y could be inorganic substances.
    B
    Materials used for crop field X are nutrient specific while those used for crop field Y are not nutrient specific.
    C
    Gradual decline in yield of crop field Y is due to killing of useful soil microbes.
    D
    Persistent yield of crop field X is due to replenishment of nutrients by gradual decomposition of organic matter.

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