干旱区生态环境知识资源中心

Based on a long-term finger millet-groundnut rotation study conducted for 24-years during 1992-2015 under Alfisols at Bangalore, organic and inorganic fertilizer effects on soil organic carbon (SOC) sequestration and sustainability of yield were assessed. Field experiments were conducted with T-1:Control; T-2:FYM@ 10t ha(-1); T-3:FYM@ 10t ha(-1) + 50% NPK; T-4:FYM@ 10t ha(-1) + 100% NPK, and T-5:100% recommended NPK in same plot every year. T-5 comprised of 50 kg N, 50 kg P2O5 and 25 kg K2O ha(-1) for finger millet and 25 kg N, 50 kg P2O5 and 25 kg K2O ha(-1) for groundnut. Sustainability yield index of treatments was assessed using measurements made on variability of yield over years. The amount of carbon sequestered was assessed to identify a superior treatment for improving soil quality. Balanced use of 100% NPK+ FYM for maintenance of SOC at antecedent level with biomass-C of 1.62 Mg C ha(-1) year(-1) was feasible for sustaining production under semi-arid Alfisols.