Thursday, 13 July 2006
66-1

Land Evaluation using Remote Sensing and GIS techniques for Sustainable Land use Planning in Irrigated Ecosyatem of Karnataka,India.

P.L. Patil, Ravikumar M.A, G.S. Dasog, S.G. Patil, and B.M. Radder. University of Agricultural Sciences, Krishinagar, Dharwad, 580005, India

For the sustainable use of the natural resources, a detailed charter of land resources giving its potential and constraints becomes pre-requisite for planning. A study was undertaken to characterize, classify and to map the soils under the Distributary No. 48-A of Malaprabha Right Bank command area of Karnataka, India using IRS 1D LISS –III image. Twelve pedons were studied for morphology, physical and chemical properties. The classification of these soils according to revisions of US Soil Taxonomy revealed that, at family level, the pedons under study were classified as very fine, clayey, smectitic, calcareous, Isohyperthermic, superactive, Typic Haplusterts. Two soil series were identified and mapped into six mapping units. Soil suitability evaluation showed that soils were marginally suitable (S3) for surface irrigation. Soil site suitability evaluation for different crops revealed that soils were moderately (S2) and marginal suitable(S3) for crops like wheat, cotton, soybean, sorghum, maize, pearl millet and crops like groundnut and pigeonpea were marginally (S3) and currently not suitable (N1) with limitations of pH and ESP. The soil samples collected at 0-30 cm from selected farmers field in the study area were analysed for pH, EC, available nitrogen, phosphorus, potassium, calcium, magnesium, sulphur and micronutrients. Nutrient status was mapped by GIS technique using GPS points of sampling locations. The soils were alkaline in nature with low salt content. Available nitrogen was generally low to medium, phosphorus, sulphur were low to high and available potassium was high in these soils.Regarding available micronutrients, Zn and iron were deficient in these soils but, Cu and Mn were deficient to sufficient range. The study on crop cutting experiment revealed that the yield levels of crops was low compared to average expected yield as the soils were deficient in N, P, S, Zn and Fe.


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