Through ______ plants get water for germination.

The available land for ______ has been decreasing.

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

Chain pump system is a _____ system of irrigation.

Grains are separated from the stalks by the process of

Before ______ the land must be watered.

______are the undesirable plants growing naturally along with crops.

In _______ method different crops are grown alternately.

There are _______ different techniques that are used in plant improvement.

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