Harahap, F. S. ., A. Rauf, B. Hidayat, H. . Walida, Jamidi, and Lisdyani. “Availibility of P, K in Paddy Land Under Organic Application”. Jurnal Online PERTANIAN TROPIK, vol. 5, no. 3, Dec. 2018, pp. 434-40, doi:10.32734/jpt.v5i3.3117.