Whalesbook
India's Farms Emit Greenhouse Gases
India's agriculture contributes about 16% of the nation's greenhouse gas emissions. This is largely due to intensive rice-wheat farming systems, a staple since the Green Revolution. Heavy use of nitrogen fertilizers is a major cause, releasing nitrous oxide (N₂O) through denitrification. Flooded rice paddies also release methane (CH₄). This focus on cereal monocultures degrades soil, depletes groundwater, pollutes ecosystems, and harms biodiversity.
Legumes: A Natural Emission Reducer
Growing legumes like chickpeas, groundnuts, soybeans, and lentils offers a sustainable way to address these environmental issues. These crops naturally fix atmospheric nitrogen into the soil. This process greatly lowers the need for synthetic nitrogen fertilizers, cutting N₂O emissions. A 2023 meta-analysis found legumes can fix about 70 kg of nitrogen per hectare, similar to applying large amounts of urea. This natural fertilization promotes strong plant growth and boosts soil fertility.
Better Soil, Less Water: Legume Benefits
Soils planted with legumes are healthier than those in cereal monocultures. Studies show over 11% more NPK (nitrogen, phosphorus, potassium) and 16-17% greater carbon sequestration in soils growing legumes. Legumes also use water more efficiently, needing about 25% less irrigation than other crops. When their environmental contributions, like natural fertilization and water saving, are valued as ecosystem services, legumes can contribute up to ₹15,000 per hectare.
Policy Stalls Legume Growth
Despite these benefits, India has not fully tapped into legume potential. Legumes currently cover only 21% of farmland, while cereals occupy nearly half, with cereal production growing much faster. This imbalance stems from a long-standing policy favoring rice and wheat since the Green Revolution, backed by subsidies for irrigation, seeds, and fertilizers, plus minimum support prices. Market factors also favor cereals, as legumes face weaker procurement and logistics.