Author(s):

RK Naresh, Arvind Kumar, RK Gupta, AK Shukla, SS Dhaliwal, RS Rathore, Vivek, Mukesh Kumar, SP Singh, Satyaveer Singh, SS Tomar, Hans Raj, SP Singh, RC Rathi, NC Mahajan and Rajendra Kumar

Abstract: The study aims to elucidate the impact of organic inputs and conservation systems on soil carbon sequestration and carbon stock dynamics in an Inceptisol of Indo-Gangetic Plain Zone of India. The management of soil organic carbon (SOC) has now been identified as the most imperative dimension for managing the global climate change as well as soil fertility. Long-term fertilization significantly influenced SOC concentrations and storage to 60 cm depth. Below 60 cm, SOC concentrations and storages were statistically not significant between all treatments. Organic manure plus inorganic fertilizer application also increased labile soil organic carbon pools in 0–60 cm depth. The average concentration of particulate organic carbon (POC), dissolved organic carbon (DOC) and microbial biomass carbon (MBC) in organic manure plus inorganic fertilizer treatments (NP+S and NP+FYM) in 0–60 cm depth were increased by 64.9–91.9%, 42.5–56.9%, and 74.7–99.4%, respectively, over the CK treatment.Average SOC concentration of the control treatment was 0.54%, which increased to 0.65% in the RDF treatment and 0.82% in the RDF+FYM treatment and increased enzyme activities, which potentially influence soil nutrients dynamics under field condition. Compared to F₁ control treatment the RDF+FYM treatment sequestered 0.28 Mg C ha^-1 yr^-1 whereas the NPK treatment sequestered 0.13 Mg C ha^-1 yr^-1. As tillage intensity increased there was a redistribution of SOC in the profile, but it occurred only between ZT and PRB since under CT, SOC stock decreased even below the plow layer. Increased SOC stock in the surface 50 kg m^-2 under ZT and PRB was compensated by greater SOC stocks in the 50-200 and 200-400 kg m^-2 interval under residue retained, but SOC stocks under CT were consistently lower in the surface 400 kg m^-2. Over the last 16 years, CT lost 0.83 ±0.2 kg of C m^-2 while ZT gain 1.98 ±0.3 and PRB gain 0.97±0.2 kg of C m^-2 in the 1200 kg of soil m^-2 profile. These results indicate that long-term adoption of organic and conservation systems have the most beneficial effects in building carbon sequestration potential and carbon stock pools among the investigated types of fertilization.

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