Harahap, F.S. , Rauf, A., Hidayat, B., Walida, H. , Jamidi and Lisdyani 2018. Availibility of P, K in paddy Land Under Organic application. Jurnal Online Pertanian Tropik. 5, 3 (Dec. 2018), 434-440. DOI:https://doi.org/10.32734/jopt.v5i3.3117.