Vol. 11, Issue 6 (2022)

Author(s):
SK Sahoo, DK Bastia, S Tripathy, KC Sahoo and M Ray

Abstract:
A field experiment was conducted during 2008-2017 at the Organic Block of Central research Station of Odisha University of Agriculture and Technology, Bhubaneswar. Rice-rice cropping sequence was taken up for nine consecutive years with seven organic nutrient management treatment combinations in Kharif and summer rice in randomized block design. The soil of the experimental site was sandy loam in texture with pH of 6.0. The values of bulk density and soil organic carbon contents in 0-15, 15-30, 30-45 and 45-60 cm soil depth, respectively, were 1.58, 1.61, 1.64, 1.66 g m^-3 and 5.2, 4.0, 2.8 and 1.8 g kg^-1. Application of organic ammendments recorded significant effect on soil organic carbon status and sustainable yield index. The observed soil organic carbon stock was maximum (83.26 t ha^-1) in treatment receiving Dhanicha @ 25 kg seed ha^-1 + FYM (5 t ha^-1) + Vermicompost (2 t ha^-1) in Kharif and FYM (5 t ha^-1) + Vermicompost (2 t ha^-1) in summer and highest rate of sequestration was also observed in the same treatment (5.55 t ha^-1 year^-1). Highest system grain yield of 9.42 t ha^-1 and Sustainable Yield Index (SYI) of 0.75 was also recorded in the treatment receiving Dhanicha @ 25 kg seed ha^-1 + FYM (5 t ha^-1) + Vermicompost (2 t ha^-1) in Kharif and FYM (5 t ha^-1) + Vermicompost (2 t ha^-1) in summer (T₅) with B:C of 1.78.