GUK GUK, Andreas S.M Raja; MANURUNG, Saroha; DJAINGSASTRO, Aulia Juanda. Analisa Kandungan N,P,K Dan C Organik pada Tanah Top Soil di Wilayah Dataran Tinggi Kebun Bah Birong Ulu Ptpn Iv Regional II. Jurnal Ragam Pengabdian, [S. l.], v. 3, n. 2, p. 1003–1014, 2026. DOI: 10.62710/30gya883. Disponível em: https://teewanjournal.com/index.php/juragan/article/view/3003.. Acesso em: 29 sep. 2026.