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The permanent plot after fourteen years of rice cropping on Vertisol resulted that the continuous use of farm yard manure, blue green algae and green manure in conjunction with fertilizers decreased soil bulk density and crack volume. 100% NPK+FYM treatment resulted in lowest bulk density (1.29 Mg/m3) and crack volume (625.73 cm3/m2) as compared to other treatments. Soil organic carbon (SOC) sequestration is important for improving soil fertility of cropland and for the mitigation of greenhouse gas emissions to the atmosphere. The efficiency of SOC sequestration depends on the quantity and quality of the organic matter, soil type, and climate. Little is known about the SOC sequestration efficiency of organic amendments in Vertisols. Thus, we conducted the research based on 14 years (1999–2013) of long-term fertilization experiment with a no fertilizer control, 50% NPK, 100% NPK, 150% NPK, 100% NPK+Zn, 100% NP, 100% N, 100% NPK+FYM, 50% NPK+BGA and 50% NPK+GM.. Mean SOC sequestration rate was 0.812 ton/ha/yr in 150% NPK treatment and 0.206, 0.13, -0.662, -0.821, -1.025, -1.082, -1.724, -2.817 and -3.302 t/ha/yr in 100% NPK, 100% NPK+FYM, 50% NPK+GM, 50% NPK, 100% NPK+Zn, 50% NPK+BGA, 100% NP, 100%N and Control respectively.
Keywords: Bulk density, Crack Volume, Soil Organic Carbon, SOC sequestration, Vertisols.