Question

Some Farmers put dried leaves of neem in an iron drum containing wheat.why?

Answer 1

This is because neem is a type of organic pesticide so protects the wheat from pests.
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Answer 2

Storing the harvested wheat is a very difficult task, because different insects and bugs often contaminate the whole crop.

To , prevent this contamination by insects and bugs,the farmers mainly use dried leaves of neem.

Because,neem is a natural antibacterial substance which prevents the contamination by insects and bugs.