Question

why is it necessary to dry the harvested food grains before storage ?​

Answer 1

Answer:

So that it can't came in the contact of moisture and water and get rotten

Answer 2

If freshly harvested grains are stored without drying they may spoil or get attacked by microorganisms, losing their germination capacity. Hence, before storing them the grains are properly dried in the sun to reduce moisture in them. This prevents the attack by insects, pests, bacteria, and fungi