Journal of FARM SCIENCES, Vol 28, No 3 (2015)

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Characterization and land suitability evaluation of a micro-watershed in north-eastern district of Karnataka

T. Kantharaj, S. R. Balanagoudar, S. N. Bhat, G. Y. Vidyavathi, U. Sathish Kumar, N. L. Rajesh

Abstract


An investigation was made to characterize and evaluate the soil resource and landforms (viz, upland, midland and lowland) of Patapura micro-watershed in Raichur district of North-eastern dry zone of Karnataka in semi-arid tropics of South India for their morphological, physical, chemical characteristics and suitability for locally preferred crops. Among ten pedons obtained from three different landforms viz, upland, midland and lowland revealed that the slope varied from nearly level (0-3%) to gently sloppy land (5-8%). The soils developed on topographically, higher elevations were dark reddish brown (5 YR hue) and those developed on lower elevation were dark greyish brown (7.5 YR hue) and dark grey (10 YR hue) colour. Soil texture, bulk density, moisture retention at 33 and 1500 kPa, available water capacity, pH (1:2.5), organic carbon, cation exchange capacity, base saturation and exchangeable sodium percentage ranged from sandy loam to clayey, 1.22 to 1.70 Mg m-3,  9.5 to 33.7 per cent, 5.9 to 24.5 per cent, 2.3 to 15.4 per cent, neutral (6.5) to alkaline (9.3), low  (0.6 g kg-1) to medium (5.8 g kg-1), 6.4 to 56.4 c mol (p+) kg-1, 41.3 to 98.7 per cent and 1.6 to 20.8 per cent, respectively. The agricultural land of the micro-watershed qualified for land capability classes III, IV, V. Higher elevated areas of micro-watershed (upland and midland) are marginally suitable (S3) for cultivation of cotton, sorghum and pigeonpea. Presently, lowland area is unsuitable for cultivation of these crops due to severe constraints of drainage and soil fertility aspects

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