“KAJIAN STATUS HARA TANAH DAN TANAMAN DI PERKEBUNAN TEHJAWA BARAT DAN SUMATERA UTARA”. Creative Research Journal 1, no. 01 (June 30, 2015): 16–30. Accessed July 8, 2026. https://crjournal.jabarprov.go.id/index.php/crj/article/view/3.