The most important step of crop production is

The process of loosening  the soil

______are the undesirable plants growing naturally along with crops.

The available land for ______ has been decreasing.

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

Through ______ plants get water for germination.

______ plants have root nodules associated with symbiotic bacteria.

In _______ method different crops are grown alternately.

________ensures uniform irrigation.

Grains are separated from the stalks by the process of