The chemical substances which destroy the weeds but do not harm the crop are called

One of the biggest canal project in India is

The bacteria in leguminous plants fix _____ .

______ is the best method to save water.

______ plants have root nodules associated with symbiotic bacteria.

Excess use of ______ cause water and land pollution.

The method in which the field is just filled with water is called

Chain pump system is a _____ system of irrigation.

The most important step of crop production is

The process of cutting and gathering a matured crop is known as _____ .