How does this practice help in the replenishment of soil?

The legume-wheat rotation creates a natural soil fertility cycle that reduces dependency on chemical fertilizers while maintaining high productivity levels.

Leguminous plants possess a unique ability to fix atmospheric nitrogen through a symbiotic relationship with Rhizobium bacteria residing in root nodules. These bacteria convert atmospheric nitrogen into ammonia and other nitrogen compounds that plants can use. When legume crops are grown, they can add 50-150 kg of nitrogen per hectare to the soil naturally. After harvest, the remaining legume roots and residues decompose, releasing this stored nitrogen into the soil.

Wheat, being a nitrogen-demanding cereal crop, then benefits from this enriched nitrogen content in the subsequent season, requiring less synthetic fertilizer application. This reduces production costs and environmental impact from fertilizer runoff.

Beyond nitrogen enrichment, this rotation breaks pest and disease cycles, as different crops attract different pests and pathogens. It also improves soil structure—legume roots create different channel patterns than wheat roots, enhancing soil aeration and water penetration. The diverse root systems at different depths also prevent nutrient depletion from a single soil layer, ensuring balanced nutrient utilization throughout the soil profile.