![]() Significant improvements in structural stability and nitrogen availability were detected in all the treatments compared to the control. On an average 12%, 14%, 59%, 15% of the water stable aggregates were in the >2 mm, 2.0-0.25 mm, 0.25-0.05 mm, and <0-0.5 size fractions, respectively. About 6% (-2 to+14) of the C added in crop residues and green manure were stabilized in the soil. ![]() Soil C stock decreased significantly with increased in soil depth 0-15 cm to 15-30 and 30-45 cm. However, it increased with balanced use of NPK inputs. Twenty years of cultivation caused a decrease in SOC only in control soils, which received no manure and fertilizer. ![]() Estimates of stabilization of SOC in different pools and a tentative C budget were also developed. ![]() We studied the long-term (20 years) influence of a wheat-mint-Sesbania cropping system on the SOC stock. It plays a significant role in maintaining soil quality, plant productivity and mitigating greenhouse gas emission. Soil organic carbon (SOC) is accumulated or depleted as a result of cropping and management strategies.
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