Yonathan, Yanda, Jamalam Lumbanraja, Henrie Buchari, and Nur Afni Afrianti. 2025. “THE EFFECT OF LONG-TERM SOIL TREATMENT AND N FERTILIZATION ON ORGANIC CARBON CONTENT, SOIL NITROGEN AND N ABSORPTION AND PRODUCTION IN CORN CROPING IN ULTISOL SOIL, YEAR 3”. Jurnal Agrotek Tropika 13 (3). https://doi.org/10.23960/jat.v13i3.11390.