Following diagnostic procedures, application of 10-15 tons of gypsum per ha is applied followed by mixing of surface (10 cm) soil. Before gypsum is applied, the field is leveled and bunded, irrigation water is applied to leach down the salts. About 2.07 Mha sodic soils have been reclaimed using gypsum application technology. The reclaimed area contributes around 16.60 million tonnes of food grains to the National pool. Farmers obtained 4 tonnes/hectare of rice and 2 tonnes/hectare wheat yield from reclaimed alkali land right from the first year of the reclamation, which increased to 5 and 3 tonnes/hectare during 3rd year onwards, respectively with an increment cost of Rs. 76500/ha. The agricultural income generated from the reclaimed soil is Rs. 25320 crores. This also provides employment opportunities to about 28 crore man-days annually. Its Net Present Worth is estimated to be Rs. 2, 80,000/ha, its Benefit Cost Ratio (BCR) of 2.47, and its Internal Rate of Return of 67% of the technology. The technology improved soil health, increased resource use efficiency, raised farm income, reduced poverty, minimized inequity, reduced flood hazards and waterlogging, recharge groundwater and improve the quality of the overall environment.
See More about:
- Gypsum bed technology for poor water quality management
- Subsurface Drainage Technology
- Auger hole technology for alternate land use system
Read More: https://cssri.res.in/technology/