SINGH, S P, B N MITTRA, and R S TRIPATHI. 2013. “Influence of Soil Enrichment With Organic and Chemical Sources of Nutrients on Rice (Oryza Sativa) Potato (Solanum Tuberosum) Cropping System*”. The Indian Journal of Agricultural Sciences 69 (5). https://epubs.icar.org.in/index.php/IJAgS/article/view/26761.