Soil Phase: A Site Specific Management Unit for Crop Planning with Suitable Soil and Water Conservation Measures

During summer 2017, a comprehensive land resource analysis of the Gadagi-2 micro watershed, Lingasusgur taluk, Raichur district, Karnataka state, India, was conducted using a cadastral map overlaid on IRS Cartosat-1 merged with LISS IV satellite imagery at a scale of 1:8000. A detailed survey was initially conducted to derive soil phase/management units based on characteristics of the land surface and soil profile. Five soil series have been recognised and mapped into five units of the soil phase. Soils have been shown to be non-saline with EC <4 dSm-1. Soil OC, available P2O5 and available K2O content were low to medium for the study region and soil N and S available status was low for all five soil phases. The soil step of HEGiC2 was graded as a Class III land capacity class with rooting and slope limitations. KALhC2g1S1R1, VKRhD2g2S2R3, CHRhC2g1S1R1 and BHGhE2g2S2R2 were graded as Class IV land potential with slope, texture, erosion, rooting status and organic carbon limitations in the rest of the soil phases. Based on soil phase site characteristics and climatic regimes, suitability for horticulture and field crops was derived. For all five soil phase units, the proposed crop plan for field crops and horticulture crops was planned. For fruit crops and forest trees, cultivation on raised beds with mulches and drip irrigation, graded bunds and strengthening of field bunds, adequate soil and water conservation and wider size pit and drip irrigation, crescent bunds were found suitable for vegetables, flowers and sole crops based on soil phase characteristics. The HEGiC2 soil phase was classified as III soil capacity and the remaining four soil phases were classified as IV soil capacity, with extreme erosion limitation of BHGhE2g2S2R2 soil phase among four mapping units. This land area can also be handled by adapting good practises for soil and water conservation, as illustrated in the results and discussion.

Author(s) Details

N.L. Rajesh
Department of Soil Science and Agricultural Chemistry, UAS Raichur, India.

H.V. Rudramurthy
Department of Soil Science and Agricultural Chemistry, UAS Raichur, India.

U.Satish Kumar
Department of Soil Water Engineering, UAS Raichur, India.

Department of Soil Science and Agricultural Chemistry, UAS Raichur, India.

B. K. Desai
Directorate of Research, UAS Raichur, India.

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