Prastowo, Erwin, Nadya Hikmah, and John Baon. “Ammonia Volatilization in Cocoa Farm As Affected by Sugarcane Filter Cake Supply at Different Urea and Soil Moisture Levels”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 30, no. 3 (February 26, 2015): 208-219. Accessed March 29, 2024. https://ccrjournal.com/index.php/ccrj/article/view/63.