Harahap, Fitra Syawal, Abdul Rauf, Benny Hidayat, Hilwa Walida, Jamidi, and Lisdyani. “Availibility of P, K in Paddy Land Under Organic Application”. Jurnal Online Pertanian Tropik 5, no. 3 (December 1, 2018): 434–440. Accessed August 4, 2025. https://idjpcr.usu.ac.id/jpt/article/view/3117.