Identification of soil fertility constraints by geographic information system technique in Kotur micro-watershed
Abstract
A study was conducted to assess available nutrient status by GIS technique in Kotur micro watershed under northern transition zone of Karnataka. Eighty two surface samples (0-20 cm depth) drawn from the micro-watershed were analyzed for their fertility status and mapped by geographic information system (GIS) technique. The pH of soil samples was slightly acidic to alkaline. Soil organic matter content was low to high. Available nitrogen (low; 100% area), phosphorus (low; 41% area, medium; 59% area) was low to medium and available potassium was medium to high and sulphur was low to medium. Regarding available micronutrients, zinc, iron, boron were deficient (52, 28 and 58% area, respectively) whereas, copper and manganese were sufficient in these soils.
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