Vol. 12, Issue 2 (2023)

Author(s):
Lavanya K. R., Kadalli G. G., Jayanthi T., Chandrakant, Prakash N. B., Ananthakumar M. A. and Umashankar N.

Abstract:
Quantitative information on carbon (C) mineralization of soil under different long term nutrient management is essential for better assessment of easily hydrolyzable C and loss of C from soil. With an aim to evaluate the differences in C mineralization due to long term fertilization and manuring treatments, a laboratory incubation study was conducted with soils (0-15 cm depth), collected from 33 years old finger millet-maize cropping system which involved application of 100% N, 100% NP, 50% NPK, 100% NPK, 150% NPK, 100% NPK + FYM (farmyard manure), 100% NPK + lime, control and uncultivated fallow land. Long-term application of fertilizers and manures significantly (p<0.05) influenced C mineralization in soil. Long term integrated application of chemical fertilizers and organic manure in soil resulted in higher cumulative carbon mineralization, basal soil respiration (BSR), microbial and mineralization quotients. A judicious FYM application strategy through integration of both organic and inorganic sources is essential for improving and maintaining soil organic C pool.