期刊
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
卷 189, 期 -, 页码 36-42出版社
ELSEVIER
DOI: 10.1016/j.agee.2014.03.019
关键词
Chemical fertilization; Integrated nutrient management; Carbon pools; Carbon stability; Nitrogen dynamics
Improved understanding of the process of carbon (C) stabilization is critical to managing emissions from agricultural soils and optimizing crop yield. We assessed soil organic C (SOC) stability and nitrogen (N) dynamics in a long-term fertilization experiment (started in 1972) conducted at three different locations in India (Jabalpur-Vertisol, Palampur-Alfisol and Ranchi-Alfisol). We measured soil organic C (SOC), C pools and stocks in the treatments of no fertilization as control, inorganic fertilization as NPK and integrated fertilization as NPK + farm yard manure (FYM). Quantification of different SOC pools was done by a procedure of acid hydrolysis followed by a long-term (247 days) incubation study. Based on crop yield and C storage, NPK + FYM was the best treatment for improving crop productivity and SOC sequestration. Integrated fertilization for 38 years increased SOC across sites. In the NPK treatment, additional C input (3-9 times higher) in the form of root biomass did not significantly change C pools. Application of FYM in addition to NPK enhanced the acid non-hydrolysable fraction of SOC across sites. Stability of SOC significantly influenced N dynamics in soil and the availability of N in soil is correlated with the amount of C in the acid-hydrolysable pool (R-2 = 0.64, p = 0.01) but not with SOC (R-2 = 0.12, p = 0.01). Long-term use of chemical fertilizers did not significantly affect soil total N content. (C) 2014 Elsevier B.V. All rights reserved.
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