Barus J, Murni AM. Recommendation of Phosphate and Potassium Fertilizers for Maize at Five Locations in Lampung. j Trop. Soils [Internet]. 2018Apr.10 [cited 2025Jul.29];15(2):127-32. Available from: https://journal.unila.ac.id/index.php/tropicalsoil/article/view/49