Which crop is generally grown between two cereal crops in crop rotation to restore the fertility of soil?

Leguminous crops such as pulses (gram, pea, lentils, beans) are generally grown between two cereal crops in crop rotation to restore soil fertility. These crops have a unique ability to fix atmospheric nitrogen in the soil through symbiotic bacteria called Rhizobium present in their root nodules. This biological nitrogen fixation replenishes soil nitrogen that gets depleted after growing nitrogen-demanding cereal crops, reducing the need for chemical fertilizers and maintaining long-term soil health. Crop rotation with legumes is a time-tested sustainable farming practice that breaks pest cycles while naturally enriching the soil.