首页|Distribution of sequestered carbon in different pools in Alfisols under long-term groundnut system of hot arid region of India
Distribution of sequestered carbon in different pools in Alfisols under long-term groundnut system of hot arid region of India
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NSTL
Elsevier
Soil organic carbon (SOC) pools are indicators of soil productivity and sustainability and provide valuable in-formation on the pathways of carbon sequestration in soils. We analysed organic C pools of different oxidiz-abilities, labile pools like particulate organic carbon, permanganate-oxidisable C, and microbial biomass carbon in soils under a long-term groundnut mono-cropping system with different management practices. Among the treatments, 50% NPK+farmyard manure (FYM) maintained a proportionately higher amount of soil carbon in passive pools (48.3%) followed by 50% NPK+ groundnut shell (GNS) (46.7%), FYM (44.7%), GNS (43.8%), 100% NPK (40.6%), 50% NPK (38.3%) and the control (32.4%). Particulate organic carbon fraction was the most sensitive fraction upon application of the amendments. Carbon stabilized from GNS and FYM sources had a skewed distribution along soil profile with a ratio of 1.2:1.0:1.4 and 1.8:1.0:1.3 at 0-15, 15-30, 30-45 cm depth, respectively. A critical carbon input of 0.32 Mg ha(-1)y(-1 & nbsp;)was needed to maintain SOC level, and the rate of conversion of crop residue C into soil organic C was about 8.1% for the present study. Combined use of chemical fertilizers and organic manure was found to be the best for enhancing SOC sequestration in groundnut mono-cropping system under hot arid eco-regions in India.
NSTL
Elsevier
