Effectiveness of Direct Application of Phosphate Rock in Upland Acid Inceptisols Soils on Available-P and Maize Yield. j Trop. Soils [Internet]. 2013 Mar. 8 [cited 2025 Nov. 1];18(1):1-9. Available from: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/163