Kumar, Dileep, A P Singh, and Anjani Kumar. 2017. “Nutrient Uptake and Yield of Rice (Oryza Sativa L.) As Influenced by Coal-Derived Potassium Humate and Chemical Fertilizers”. ORYZA-An International Journal of Rice 54 (2). http://epubs.icar.org.in/index.php/OIJR/article/view/75176.