Question

why do farmers grow leguminous crop after harvesting of cereal​

Answer 1

Answer:

When the cereal crops like rice, wheat, maize are grown in the soil, it uses up a lot of nitrogenous salts from the soil. ... Thus, planting a leguminous plant will result in nitrogen rich soil and when a cereal is grown in this soil there is increase in food grain production.

Answer 2

Answer:

To replenish the soil. They convert atmospheric nitrogen into water - soluble nitrates

Examples of legume crops = Beans , pulses etc.