., P., Handayanto, E., Suprayogo, D., Bako Baon, J. and Hairiah, K. (2007) “Potential Nitrification and Nitrogen Mineral of Soil in Coffee Agroforestry System with Various Shading Trees”, Pelita Perkebunan (a Coffee and Cocoa Research Journal), 23(1). doi: 10.22302/iccri.jur.pelitaperkebunan.v23i1.49.