“Effect of Poultry Manure and Vertisols Matter on Availability and Leaching of Macronutrients in Coastal Sandy Soil”. JOURNAL OF TROPICAL SOILS 16, no. 1 (July 1, 2013): 17–24. Accessed October 31, 2025. https://journal.unila.ac.id/index.php/tropicalsoil/article/view/116.