Journal
EUROPEAN JOURNAL OF SOIL BIOLOGY
Volume 58, Issue -, Pages 113-121Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejsobi.2013.07.004
Keywords
Carbon mineralization; Long term fertilizer experiment; Microbial quotient; Mineralization kinetics; Mineralization rate; Nitrogen mineralization
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Quantitative information on carbon (C) and nitrogen (N) mineralization of soil under different long term nutrient management strategies is essential for better assessment of N availability and loss of C and N from soil. A laboratory incubation study was conducted with soils (0-15 cm and 15-30 cm depth), collected from 41 years of rice-rice system to evaluate the differences in C and N mineralization kinetics due to long term fertilization treatments-control (Non fertilized), N, NPK, FYM (Farmyard manure), N + FYM and NPK + FYM, and to assess the C and N mineralization rates in soil under different moisture regimes, i.e. aerobic and submergence. Both long term fertilization and moisture regime significantly affected C and N mineralization in soil. Long term integrated application of chemical fertilizer and organic manure (NPK + FYM, N + FYM) in soil resulted in higher potentially mineralizable C (C-0), potentially mineralizable N (N-0), rates of mineralization (dC(min)/dt and dN(min)/dt), microbial and mineralization quotients as compared to either of them applied alone (N, NPK, and FYM). Higher values of C-0, N-0, and rates of mineralization were recorded under aerobic condition than that under submergence. The amount of N released per unit C mineralization was higher in aerobic system that may result in greater loss of N from the system. A judicious N application strategy through integration of both organic and inorganic sources is essential for improving current N supplying capacity of soil and maintaining soil organic C pool in aerobic system. (C) 2013 Elsevier Masson SAS. All rights reserved.
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