Long Term Impact of Integrated Farming System on Nutrient Status and Soil Organic Carbon Pools in Different Land Uses Under North-Western Himalayas
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Date
2022-02
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
A study was carried out during 2020 to assess the long-term impact of integrated farming system (IFS) on nutrient status and soil organic carbon pools in different allocated land use systems viz crop block, horticulture, fodder block, boundary plantation block and perennial fodder on the dyke of pond under IFS model over the existing farmer’s farming system (crop land use system). A profile soil samples (0-15, 15-30, 30-45 and 45-60 cm depth) were collected during summer season 2020 from all land use systems of IFS and existing farmer’s farming system modules with three replications in a Randomized Block Design (RBD). The laboratory analysis of the sample revealed that the lowest soil bulk density (1.26 g cm-3) and EC (0.20 dS m-1) was recorded in the inter boundary plantation between outer boundary planted with agroforestry plant and inner boundary with short statured mango tree as compared to other land use system however soil pH (7.64) was lower in horticulture land use system which was statistically at par with boundary plantation (7.65). The maximum available N (307.51 kg ha-1), P (22.68 kg ha-1), K (140.35 kg ha-1), Fe (31.45 mg kg-1), Mn (31.55 mg kg-1), Zn (1.48 mg kg-1), Cu (1.01 mg kg-1), soil organic carbon (10.15 g kg-1), total organic carbon (28.00 g kg-1), microbial biomass carbon (175.34 µg g-1), very labile carbon (5.42 g kg-1), labile carbon (2.95 g kg-1), less labile carbon (1.79 g kg-1), non-labile carbon (17.85 g kg-1) and SOC stock (19.18 Mg C ha-1) were recorded in boundary plantation land use system whereas lowest was recorded in existing farmer’s farming system. Among various oxidizable organic carbon fraction, non-labile C (CNL) contributed more to total organic carbon (TOC) in all land use systems at varying depths. Whereas passive pool (CPP) of organic carbon was higher over active pool (CAP) in all land use systems with maximum value of CPP (19.64 g kg-1) observed in boundary plantation land use system, thereby enhanced the Carbon Management Index (CMI) to the extent of 44.45 and 90.54 % over cropping land use system under IFS and existing farmer’s farming system at surface depth. Average soil carbon stock and its sequestration under various land use systems of IFS model worked out to be 31.12 and 3.66 Mg C on an area of 0.82 ha as compared to existing farmer’s farming system module (26.34 Mg C ha-1) with negative carbon sequestration to the tune of -0.65 Mg C on an area of 1.0 ha over a period of 10 years. Various C pools at surface soil depth gave a significant and positive correlation with each other and significantly but negative correlated with soil pH, EC and bulk density.
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Preferred for your work. Kumar,S. 2021.Long Term Impact of Integrated Farming System on Nutrient Status and Soil Organic Carbon Pools in Different Land Uses under North-Western Himalayas, M.Sc. Thesis, SKUAST-Jammu