AMIRRULLAH, Johanes; HUTAPEA, Yanter; RATMINI, NPS; PRABOWO, Agung. Farmer Mentoring in Determining Fertilization Dosage of Corn Plants (Zea Mays L.) Using Soil Test Equipment. Jurnal Lahan Suboptimal : Journal of Suboptimal Lands, [S. l.], v. 9, n. 1, p. 102–108, 2020. DOI: 10.33230/JLSO.9.1.2020.437. Disponível em: https://jlsuboptimal.unsri.ac.id/index.php/jlso/article/view/437. Acesso em: 18 jun. 2026.