Question

why do farmers grows leguminous crops after harvesting of cereals?

Answer 1

To do nitrogen fixation in the soil,because legumes plants contains rizombium bacteria which helps in nitrogen fixation.

Answer 2

Farmers grows leguminous crops after harvesting of cereals:

The farmers plant leguminous crops after harvesting cereals to replenish the nitrogen content of the soil.

The leguminous plants contain the symbiotic nitrogen fixing bacteria that live in their root nodules. These nitrogen fixing bacteria fix the atmospheric nitrogen into nitrites and nitrates and make them available to the plants for their metabolism.

An ideal example of such a bacteria is the Rhizobium sp. They maintain a symbiotic relationship in which the bacteria provides nutrient to the plant and the plant in turn provides food and shelter for the bacteria.