Question

Why is it sometimes necessary to treat the soil before growing crops

Answer 1

this is because that the soil nutrients get in small quantity as a result of previous crop growth.

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Answer 2

Plowing makes the soil porus which helps the seeds to easily germinate and spread roots deep which in turn helps the plant to absorb required nutrients and moisture from the deeper parts of the soil. It also provides necessary aretaion for the plant roots.

Also, when you plow it mixes the surface soil which has dried leaves and other rotten material which contain good amount of nitrogen and other essential nutrients with the deep soil and makes it available to the plants for longer periods.