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Authors
Affiliations
1 Department of Soil Science and Agricultural Chemistry, College of Agriculture, PJTSAU, Hyderabad, Telangana, IN
2 CRIDA, Hyderabad, Telangana, IN
Source
Nature Environment and Pollution Technology, Vol 16, No 2 (2017), Pagination: 493-498
Abstract
A systematic set of geo-referenced 154 soil samples were collected from the Karimnagar district, Telangana state, India, covering the entire rice growing area using GPS (Global positioning system) and the maps showing the spatial variability of individual macronutrients (N, P, K and S) were generated using Arc-info GIS (Geographic information system). The soil samples were analysed for physicochemical properties and available macronutrients. The available N status ranged from 119.17-784.0 kg ha-1 while the available P, K and S status varied from 12.61-88.46 kg ha-1, 105.68-754.4 kg ha-1 and 5.85-75.5 mg kg-1 respectively. Analytical results and the GPS data were used for the preparation of thematic map showing spatial distribution of N, P, K and S status, mandal-wise in the district. Locations of soil sampling sites of Karimnagar district were marked on the base map on 1:50,000 scale prepared from state revenue maps and digitized using Arc-info GIS. The delineation study clearly indicated that the available N was found to be low in 61.7% of soil samples of Karimnagar district, while phosphorus is in medium status. Nearly 33.8 and 62% of the surface soils were medium and high in available K, respectively. Most of rice growing soil samples were low (39%) in available sulphur in the district. The GIS-aided thematic maps indicated that 49.73, 11.85 and 24.4% of the total geographical area of Karimnagar district was deficient in the N, P and S, respectively.
Keywords
Macronutrients, Rice Growing Soils, GIS-Aided Mapping.
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