Q23 of 69 Page 15

Why is soil replenishment essential?

By growing the same crop year after year in the same soil/field, the soil gets depleted of certain nutrients. This results in a drop in crop yield every year. Hence, soil replenishment is essential.

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21 A farmer grows maize crop in a field year after year. He finds that the yield becomes low. Give one possible reason for it. 22 What are the characteristics, which are expected to be available in the seeds of improved varieties? 24 The fields, in which legumes are grown get enriched with nitrogen. Why? 25 What is mixed cropping? What are its advantages?