Distribution of Soil Fertility of Smallholding Arabica Coffee Farms at Ijen-Raung Highland Areas Based on Altitude and Shade Trees. Pelita Perkebunan (a Coffee and Cocoa Research Journal), [S. l.], v. 29, n. 2, 2013. DOI: 10.22302/iccri.jur.pelitaperkebunan.v29i2.57. Disponível em: https://www.ccrjournal.com/index.php/ccrj/article/view/57. Acesso em: 19 may. 2026.