Wibowo, H, R Nalendra Warna, P Wulandari, T Prakoso, D Prasetyo, T Ariefandra Airlangga, B Heru Purwanto, S N Hidayah Utami, E Sulistyaningsih, and S Handayani. “Identification the Availability of P in Land Planted With Corn on Volcanic, Karst and Acid Soils in Indonesia”. KnE Life Sciences 4, no. 11 (March 10, 2019): 179–188. Accessed January 22, 2020. https://knepublishing.com/index.php/KnE-Life/article/view/3864.