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K. Radhika, S. Sivagnanam, J. Sekar, Y. Muralidharudu, Pradip Dey and A. Subba Rao RSPSKA. Soil Fertility Appraisal for Villupuram District of Tamil Nadu using GPS and GIS Techniques. JISSS. 2018;66(2). Accessed June 6, 2026. https://epubs.icar.org.in/index.php/JISSS/article/view/83001