Short-Term Carbon Sequestration and Changes of Soil Organic Carbon Pools in Rice under Integrated Nutrient Management in India

While the capability of integrated nutrient management (INM) in rice systems has been adequately studied, little is known about related short-term carbon sequestration and changes soil fractions. Our study examined responses organic pools, yields after application different manures combined with chemical fertilizers a rice–rice (Oryza sativa L.) cropping system red laterite agro-climatic zones West Bengal, India. The treatments included non-fertilized control; straw (RS) + nitrogen, phosphorus potassium fertilizer (NPK); Gliricidia (GL) NPK; farmyard manure (FYM) vermicompost (VC) NPK only. Rice treatment resulted highest total passive pool carbon. Vermicompost oxidizable (0.69%), dissolved (0.007%) microbial biomass (0.01%), followed by FYM NPK, GL RS as compared to control. sequestered amount dioxide (CO2) (91.10 t ha−1) (85.64 ha−1), whereas VC CO2 (10.24 being active carbon, (8.33 (7.22 ha−1). both only grain over three seasons. In spite high observed more recalcitrant increase (3.52 yield short term. results this suggest that fractions primarily depend on type used. Vermicompost, provide labile which can improve However, it suggested explore dynamics fractions, pools longer periods time.