Faculty of Agricultural Sciences, GLA University, Mathura-281 406, India
1Department of Soil Science, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar-263 145, India
2Department of Agronomy, College of Agriculture, G.B. Pant University of Agriculture and Technology, Pantnagar-263 145, India
An investigation was undertaken to study 30 years fertilization impact on total soil organic carbon (TOC), C sequestration, soil enzymatic activities and yield of rice in Aquic Hapludoll under rice-wheat sequence in sub-humid and sub-tropic of India. The experiment comprised 14 treatments having N, P, K levels with or without FYM and Zn. At inception of experiment (1984) TOC was 12.18 g kg−1 and highest (15.64, 13.26, 11.56 g kg−1) was observed with super optimal NPK (180:80:40)+Zn+FYM which was at par to optimal/100% NPK(120:40:40)+Zn+FYM in 0–15, 15–30 and 30–60 cm soil depth. In 0–15 cm soil layer the highest and lowest C sequestration was found in 100% NPK+Zn+FYM and 100% N, respectively. Application of super optimal and optimal NPK in conjunction with FYM and Zn recorded maximum fluorescein diacetate activity (FDA) and β-glucosidase activity in 0–60 cm soil profile. Highest grain yield of rice found due to application of 100% NPK+Zn+FYM. Therefore, from this experiment, it is concluded that integration of FYM and Zn with super optimal and optimal NPK are most efficient nutrient management practices in improving soil health and production of rice-wheat cropping system by sequestering more C and improving C associated enzymatic activities in soil.
Long-term fertilization, Carbon sequestration, Fluorescein diacetate activity, β-glucosidase activity, Rice-wheat cropping system
