S.K. Singh, H.S. Jatav. “Effect of Biochar Application in Soil Amended With Sewage Sludge on Growth, Yield and Uptake of Primary Nutrients in Rice (Oryza Sativa L.)”. Journal of the Indian Society of Soil Science, vol. 67, no. 1, June 2019, https://epubs.icar.org.in/index.php/JISSS/article/view/90492.