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Soil quality standards are used as a means to maintain long-term soil productivity and these standards provide threshold values beyond which further alteration of soil properties would significantly change or impair the productivity potential of the soil. Suitability of the soils for a particular crop is an important factor from the productivity point of view. The importance of soil in supporting food crops requires due attention towards study of the chemical composition of soils in relation to crop needs. The study area chosen is Siddapura catchment which is a part of Harangi command area covered in Hassan, Madikeri and Mysore districts, Karnataka state. Geographically it lies between 75 0 38' E and 76 0 15' E longitude and 12 0 24' N and 12 0 46' N latitude, covering an area of 1522.4 km2. The study area is covered in

The development of watershed aims at productive utilization of all the available natural resources in the entire area extending from ridge line to stream outlet. The per capita availability of land for cultivation has been decreasing over the years. Therefore, water and the related land resources must be developed, utilized and managed in an integrated and comprehensive manner. Remote sensing and GIS techniques are being increasingly used for planning, management and development of natural resources. The study area, Nallur Amanikere watershed geographically lies between 11 0 38' and 11 0 52' N latitude and 76 0 30' and 76 0 50' E longitude with an area of 415.68 Sq. km. The thematic layers such as land use/land cover and soil maps were derived from remotely sensed data and overlayed through ArcGIS software to assign the curve number on polygon wise. The daily rainfall data of six rain gauge stations in and around the watershed (2001-2011) was used to estimate the daily runoff from the watershed using Soil Conservation Service-Curve Number (SCS-CN) method. The runoff estimated from the SCS-CN model was then used to know the variation of runoff potential with different land use/land cover and with different soil conditions.

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