SOIL FERTILITY STATUS OF A PART OF GLBC COMMAND AREA USING GIS
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Date
2002
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University of Agricultural Sciences, Dharwad
Abstract
The idea of optimizing the utilization of the land resource with intensification of agriculture has resulted either in the fast depletion of nutrients or occasionally in their accumulation especially noticed in command area. An attempt was made to assess the soil fertility status of a portion of GLBC command area (46029.9 ha) in relation to position of landscape was assessed. Two hundred and fourty two surface soil samples were collected at random from the study area lying between GLBC main canaJ and Ghataprabha river representing all physiographic positions of landscape. The pH of the soils was slightly to moderately alkaline (8.02 to 8.96) and EC at the surface ranged from 0.11 to 1.40 dS m-' and was slightly on the higher side in alluvial plains. Majority of the soils recorded medium to high OC content ranging from 0.34 to 1.33 per cent. The CaCOa content ranged from 5.13 to 11.55 per cent. The available nitrogen content ranged from 211.0 to 321.6 kg ha-' with in 19540 ha as low and 26490 ha as medium status. The available phosphorus content ranged from 12 to 38 kg ha-' with 11354 ha area recording medium and 34677 ha area as high in P status. The available potassium status was high in 40612 ha and medium in 5418 ha area ranging from 201 to 689 kg ha-'. The exchangeable Ca and Mg content of all the soils were high. The available sulphur content ranged from 17.5 to 53.5 kg ha-' with 12420 ha area recording low, 31563 ha medium and 2047 ha high in sulphur content. Due to intensive irrigated agriculture practiced in command area, nutrient status did not follow distinct trend with respect to physiographic units and crops grown.
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No . of references 79