Alkaline soils are a common problem in many parts of India. These soils have a high pH level, often above 8.5, which makes it difficult for plants to absorb nutrients. As a result, crops grow poorly, leaves turn yellow, and yields remain low. Reclaiming alkaline soils is important for improving crop productivity and ensuring long-term soil health. With proper methods, farmers can gradually convert alkaline soils into fertile, productive land.
One of the most effective ways to reclaim alkaline soils is by applying gypsum (calcium sulphate). Gypsum helps replace excess sodium in the soil with calcium. Sodium is the main reason for alkalinity and poor soil structure. When gypsum is applied, it helps break down hard soil, improves water movement, and allows plant roots to grow better. The amount of gypsum needed depends on the soil test, but generally, 2–5 tons per hectare is recommended for moderate alkalinity.
Another important method is adding organic matter, such as farmyard manure (FYM), compost, green manure, and crop residues. Organic matter improves soil structure, increases microbial activity, and helps balance soil pH over time. When organic matter decomposes, it releases organic acids that help reduce alkalinity. Growing green manure crops like dhaincha or sunhemp and mixing them into the soil can further improve soil fertility.
Improving drainage is also crucial for reclamation. Alkaline soils often have poor water infiltration, leading to salt accumulation on the surface. Creating proper drainage channels, leveling the land, or installing subsurface drains can help remove excess salts from the soil. After rainfall or irrigation, salts move downward, preventing salt build-up on the surface.
Farmers can also use acidic fertilizers, such as ammonium sulphate or urea, which gradually help reduce soil alkalinity. These fertilizers release acids during decomposition, making the soil more balanced and favourable for crop growth. However, farmers should avoid excessive use and follow recommended doses to prevent nutrient imbalance.
Mulching with crop residues or straw helps in controlling soil temperature, reducing salt accumulation, and conserving moisture. Mulching also adds organic matter to the soil as it decomposes, improving soil texture and fertility.
Another useful practice is leaching. This involves giving heavy irrigation to flush salts deeper into the soil. Leaching works best when the field has good drainage. Farmers should carry out leaching before sowing sensitive crops because high salt content can prevent seeds from germinating.
For long-term improvement, selecting salt-tolerant crop varieties can help farmers achieve better yields while the soil is still recovering. Crops like barley, sorghum, mustard, and certain varieties of wheat and rice grow better in alkaline soils. Growing these crops for a few seasons allows farmers to maintain productivity while reclamation continues.
Regular soil testing helps farmers monitor changes in soil pH, sodium levels, and nutrient status. This allows them to adjust gypsum application, fertilizer use, and organic matter inputs according to the soil’s needs.
Reclaiming alkaline soil takes time, but with continuous efforts—gypsum application, organic matter addition, improved drainage, mulching, leaching, and choosing suitable crops—farmers can gradually restore soil health. Healthy soil leads to better crops, higher yields, and more sustainable farming for the future.
