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 [Internet]. 2018 Sep. 7 [cited 2026 Jun. 6];66(2). Available from: https://epubs.icar.org.in/index.php/JISSS/article/view/83001