“Potential Nitrification and Nitrogen Mineral of Soil in Coffee Agroforestry System With Various Shading Trees”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 23, no. 1 (May 1, 2007). Accessed August 12, 2026. https://mail.ccrjournal.com/index.php/ccrj/article/view/49.