PA NUGROHO. PEMANFAATAN LAHAN SUB-OPTIMAL UNTUK PENGUSAHAAN TANAMAN KARET: SUATU RANGKUMAN HASIL SURVEI DAN PENELITIAN. Jurnal Online Pertanian Tropik, [S. l.], v. 2, n. 2, p. 110–115, 2015. DOI: 10.32734/jopt.v2i2.2891. Disponível em: https://idjpcr.usu.ac.id/jpt/article/view/2891. Acesso em: 5 aug. 2025.