Answer:
Growing the same crop year after year in the same field
makes the soil deficient of certain nutrients, which results in a decrement of
crop yield every year.
If these nutrients are not replenished, the soil will become
unfit for cultivation. Therefore, replenishment of soil is
essential.
Replenishment of soil can be done in the following ways By
performing crop rotation, different crops that have different requirements of
nutrients, are grown on a same piece of land during different seasons. Thus,
the soil is not deficient of any particular nutrient all the time. Often a
legume crop, (.e.g., pea, gram, etc.) is grown alternately to replenish the
soil.
(ii) By leaving the agricultural land free or uncultivated
for few seasons, also helps the soil to regain its richness.
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