Excess use of ______ cause water and land pollution.

Grains are separated from the stallks by the process of

Before ______ the land must be watered.

Beating the cut stalks against machine called _____

The process of loosening  the soil

______ irrigation is used where the soil cannot retain water for a long time.

Chain pump system is a _____ system of irrigation.

_______ is growing faster than its ability to produce rice and wheat.

______are the undesirable plants growing naturally along with crops.

One of the biggest canal project in India is