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Geo referenced soil survey was undertaken in rice growing areas of Thondamuthur Block, Coimbatore district of Tamil Nadu. The main aim of this study was to carry out the evaluation of soil fertility and fertilization practices being followed by the rice growing farmers of the selected villages in Thondamuthur block. Soil samples (50 Nos) were collected from with an auger from a depth of 0-15 cm and analyzed for pH, electrical conductivity, organic carbon, available macro and micro nutrients using standard analytical methods. These data were used to spot the range of critical soil available nutrient and the relationships among the soil fertility parameters. Based on the results obtained, soil reaction was neutral to alkaline in nature. With respect to salinity, 16 % of the soils from Muttathuvayal village alone were slightly saline and remaining 84 % of the soil samples were non saline. Almost 80 per cent of the villages fall under the medium category of soil organic carbon content. Results indicated that 54 percent of the samples are low to medium in available nitrogen; for Olsen P, it was 90 percent in high status; and about 80 per cent of the samples were medium in NH4OAc – K. Except Cu, other micronutrients were deficient. From the nutrient index, Cu was above sufficiency range, P and Fe were found to be adequate and the other elements were deficit in soil.

Appraisal of soil nutrient status in rice ecosystem using nutrient index in Thondamuthur Block, Coimbatore