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Application of GIS in soil productivity assessment and mapping Study area The study area (Pedappampatti watershed) is located in Udumalpet taluk of Coimbatore district in Tamil Nadu, India. It lies between 100 351 and 100 451 North latitude and 770 051 and 770 151 East longitudes. The total extent is 5816.24 hectares and is covered in the Survey of India toposheet 58 F2. The geology of the study area comprises of granite and gneiss rocks. The mean annual rainfall is 444 mm and the mean minimum and mean maximum air temperature are 21.5 0C and 32.0 9C, respectively. The soil moisture regime is generally Ustic and the soil temperature regime is "isohyperthermic". The major crops cultivated in the study area include coconut, banana, maize, sorghum and vegetables. Materials and methods Jeep traverse was made in the study area to collect information on land forms, land use, sample strips and distribution of soils. Detailed soil investigation was carried out in each image interpretation unit of satellite data (IRS-1C LISS III FCC) by examining profile pits. Horizon wise samples were collected from respective pedons of each soil series for detailed analysis of various morphological, physical and chemical properties. The interpretation units having similar soil composition were merged together and made as a single unit. The satellite data of the study area is represented in Fig. 1.  Figure 1. IRS-1C LISS III FCC of the study area The soil samples collected during survey were air dried, powdered with wooden mallet and sieved through a 2 mm sieve and used for laboratory analysis. For estimation of organic carbon, a portion of the samples were sieved through 60 mesh sieve Based on the morphological, physical and chemical properties, the soils were classified as per USDA soil taxonomy. (Soil Survey Staff, 1998). |