Long-term effects of crop residues and fertility management on carbon sequestration and agronomic productivity of groundnut–finger millet rotation on an Alfisol in southern India |
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Authors: | Cherukumalli Srinivasarao Bandi Venkateswarlu Rattan Lal Anil Kumar Singh Sumanta Kundu Kanuparthy Pandu Ranga Vittal |
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Institution: | 1. Central Research Institute for Dryland Agriculture , Santoshnagar, Saidabad (P.O.), Hyderabad , 500 059 , Andhra Pradesh , India cherukumalli2011@gmail.com;3. Central Research Institute for Dryland Agriculture , Santoshnagar, Saidabad (P.O.), Hyderabad , 500 059 , Andhra Pradesh , India;4. Carbon Management and Sequestration Center , The Ohio State University , Columbus , OH , 43210 , USA;5. Indian Council of Agricultural Research , Krishi Anusandhan Bhawan (KAB-II), New Delhi , 110 012 , India;6. National Institute for Abiotic Stress Management , Baramati , 413 115 , Maharashtra , India |
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Abstract: | The data from long-term management and cropping systems experiments are needed to assess changes in soil quality, organic carbon pool, and agronomic sustainability. Thus, a 13-year-old soil fertility management experiment was used to assess the impact of crop residues carbon (C) inputs on SOC stock in a rainfed groundnut (Arachis hypogeae L.)–fingermillet (Eleusine coracana (L.) Gaertn) rotation in semiarid alfisol. The application of farmyard manure (FYM) alone or in a combination with chemical fertilizers contributed to higher amounts of C inputs and subsequently to build up a higher SOC pool. Application of 10?Mg?ha?1 of FYM and a recommended dose of chemical fertilizer (25:21.8:20.7 and 50:21.8:20.7?kg?N, P, K ha?1 for groundnut and fingermillet, respectively) increased soil SOC pool by 41.2% to 73.0?Mg?ha?1 with an increase of 9.3?Mg?ha?1 over 13 years. Both SOC pool and rates of its sequestration were positively correlated with cumulative C input and sustainable yield index. A minimal input of 1.62?Mg?C?ha?1?yr?1 is needed to maintain SOC pool at the antecedent level. Balanced application of NPK fertilizers is needed to reduce and reverse the depletion of SOC pool. |
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Keywords: | carbon inputs carbon sequestration groundnut–finger millet rotation semi-arid tropics sustainable yield index |
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