Effect of long-term fertilizer application on C-sequestration and sustainable yields of finger millet and groundnut grown under rotation in semi-arid Alfisols |
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| Authors: | A Sathish BK Ramachandrappa HK Ashoka |
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| Institution: | 1. Department of Soil Science and Agricultural Chemistry, College of Agriculture, University of Agricultural Sciences, Bangalore, India;2. All India Coordinated Research Project for Dryland Agriculture, University of Agricultural Sciences, Bangalore, India |
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| Abstract: | 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 T1:Control; T2:FYM@ 10t ha?1; T3:FYM@ 10t ha?1 + 50% NPK; T4:FYM@ 10t ha?1 + 100% NPK, and T5:100% recommended NPK in same plot every year. T5 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. |
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| Keywords: | Carbon sequestration crop rotation rainfall regression soil organic carbon sustainability yield index |
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