DELINEATION AND MAPPING OF THE AREAS DEFICIENT FOR MICRONUTRIENTS AND SULPHUR USING GIS AND GPS TECHNIQUEST. Satish Kumar, M. Chandini Patnaik, B. Srinivas, K. Chandrashaker and M. Shruthi
Geo referenced soils from 279 sites covering 59 mandals of Nalgonda district representing different soil types were collected randomly at 0-15 cm depth with simultaneous GPS points recorded. The results indicated that the soils were slightly acidic to alkaline in reaction, normal in soluble salt content, low to medium in organic carbon content and calcareous in nature. The micronutrient status was delineated and found that soils of Nalgonda district were deficient in Zn (6.78%), Fe (25.7%) and Mn (2.5%) with B (96.03%) and S (59.61%) indicating their application requirement to increase the soil fertility and productivity. Deficiency of only one element was observed in most of the mandals. Only a small portion of the district (Rajapet mandal) had multi micronutrient deficiency i.e. deficiency of more than one micronutrients. The pH, EC and CaCO3 had significant negative correlation with DTPA extractable micronutrients (Zn, Cu, Fe and Mn) and hot water soluble boron and positive correlation with available sulphur. All micronutrients and available sulphur were significantly and positively correlated with organic carbon content in these soils. Digitized maps using ARC GIS for individual micronutrients i.e. Zn, Cu, Fe, Mn and B and secondary nutrient (S) were prepared based on the categorization of nutrients.
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