EFFECT OF WATERSHED-BASED INTERVENTIONS ON SOIL KEY PROPERTIES, CARBON SEQUESTRATION, YIELD, UPTAKE AND NUTRIENT CONTENT OF SELECTED CROP IN SELECTED LAND USE SYSTEM OF APPANAHALLI SUB WATERSHED OF GUBBI TALUK, KARNATAKA
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Date
2023-03-30
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University of Agricultural Sciences, Bangalore
Abstract
An investigation was carried out to evaluate the effect of watershed based interventions on soil key properties, carbon sequestration, yield, uptake and nutrient content of ragi crop in three land use systems (upland, midland and flatland) of Appanahalli sub watershed of Gubbi Taluk, Karnataka. Surface and sub-surface soil samples were collected at 320 m grid interval and collected ragi straw along with ear heads were transported to laboratory and analysed. The results were compared with the previous study of 2017. Soils of Appanahalli sub watershed were grouped into five textural classes viz, sandy loam, loamy sand, sandy clay, sandy clay loam and clay with a bulk density value of 1.43 Mg m-3. The pH of the soil varied from strongly acidic to
moderately alkaline with EC value of 0.16 dS m-1 and cation exchange capacity value of 19.81 dSm-1. Soil was medium in organic carbon, available N, P2O5 and K2O, high in sulphur, low in B with sufficient content of Ca2+, Mg2+, Fe, Mn, Cu and Zn. The mean values of soil microbial biomass carbon and nitrogen were 366.73 μg g-1 and 42.08 μg g- 1, respectively. Concentration of macro and micro-nutrients were more in flatland when compared to upland. Very labile carbon, labile carbon, less labile carbon, non-labile carbon, inorganic carbon, particulate organic carbon and active carbon values were more in flatland of the watershed. Soil organic carbon stock in Appanahalli sub watershed is 1.46 kg m-2 and a total of 0.20 Mg C ha-1 has been sequestered in the period of four years. Grain yield (23.28 q ha-1) and straw yield (27.12 q ha-1) of finger millet grown in sub watershed were higher in flatland compared to upland because of surface accumulation of nutrients and organic matter. In comparison with earlier study of 2017, no significant variation was observed in soil nutrients and finger millet yield except soil available nitrogen