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Application of GIS in soil productivity assessment and mapping  Rajith Mukundan Bharani” Nettayam, Kachani post Trivandrum Kerala PIN-695013 INDIA Phone : 0471-2362199 E – mail : rajithmukundan@rediffmail.com S. Chellamuthu & R. Sivasamy Department of Soil Science & Agricultural Chemistry Tamil Nadu Agricultural University Coimbatore-641 003 Introduction Efficient management of natural resources is essential for ensuring food supplies and sustainability in agricultural development. The task of meeting the demands of man without affecting the ecological assets for the future generations is being given top priority by both scientists and planners. Assessing the land qualities specific to a location and identifying the need for conservation practices are essential steps in the process of land use planning for environmentally sustainable agricultural production. The management and analysis of large volumes of spatial data requires computer based systems called Geographical Information System (GIS) which can be used for solving complex geographical and hydrological problems (Garg, 1991). Geographical information system is defined as a system of computer hardware and software designed to allow users to collect, manage, analyse, and retrieve large volumes of spatially referenced data collected from variety of sources (Aronoff, 1991). The most useful application of GIS in resource investigation is to overlay various thematic maps such as rivers, roads, soils, etc to derive useful results. GIS is a powerful tool for management and analysis of data required for any land developmental activity. The present study has utilized the analytical capabilities of GIS in generation of thematic map on soil productivity. The area under each productivity class for field crops, forage crops and tree crops was also arrived at.
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