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University of Horticultural Sciences, Bagalkot (2018)

SOIL FERTILITY MAPPING USING GIS IN RAMTHAL DRIP IRRIGATION AREA OF BAGALKOT

HANUMESH

Titre : SOIL FERTILITY MAPPING USING GIS IN RAMTHAL DRIP IRRIGATION AREA OF BAGALKOT

Auteur : HANUMESH

Université de soutenance : University of Horticultural Sciences, Bagalkot

Grade : Master of Science (MS) 2018

Résumé
Bagalkot district has arid climate with low rainfall and high temperature. Soils of this region are thirsty and to meet the water demand of farming community, Karnataka Krishna Bhagya Jal Nigam Ltd, has launched Ramthal micro irrigation project. This project addresses the thirsty issue but soil fertility which shows spatial heterogeneity needs to be addressed. Hence a study was conducted to characterization, map and identity fertility constraints in Ramthal irrigation area using GIS and also to assess the performance of ABDTPA universal extractant in determining the available micronutrient status of black soils of Bagalkot. Soils of Ramthal area was strongly alkaline and non-saline in nature with low in nitrogen, medium in available phosphorus, high in available potassium and low to medium in available sulphur content. Exchangeable calcium, magnesium and sodium were dominated cation in the soils. Status of micronutrients availability was in low category for most of micronutrients except copper and manganese. Soil pH, organic carbon, exchangeable calcium, sodium and Available manganese showed significant spatial clustering. Soil sampling points (236 samples) were grouped into two clusters using K-mean clustering and these two clusters showed distinct relation with elevation. Out of total 634 ha area, major area (143.18 ha) was under high organic carbon, medium sulphur and manganese followed by 122.86 ha under low organic carbon, medium in sulphur and manganese. A profile study of Ramthal area carried at different elevation (Top, Middle and Bottom). Showed decreasing trend for pH, EC and sodium with elevation where as nitrogen, calcium and sulphur showed opposite trend with elevation. Soil pH and EC showed increasing trend with depth. Organic carbon, available nitrogen, phosphorus, potassium and sulphur content showed decreasing with profile depth. Available micronutrients Fe and Zn were low and showed decreasing trend with depth. Available copper and manganese was sufficient in surface layer and deficient in sub surface layer. Micronutrients trend with depth not observed and varied across the soil profile. The comparative study of traditional extractant and universal extractant (ABDTPA) for micronutrients, (Fe, Cu, Mn, Zn) phosphorus and potassium showed low correlation in the study area. The level of extraction of phosphorus by ABDTPA was not in the detectable level of the instrument (MP-AES). Available iron, copper and potash estimated by the ABDTPA was more compared to traditional extractant DTPA

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