Umar A, Saprudin D, Hazra F. EFFECT OF MAGNETITE AND CHITOSAN-MAGNETITE ADDITION ON BACTERIAL LEVELS AND NH3-N (FREE-LIVING N2-FIXING BACTERIA CULTURE). J. kim. ris [Internet]. 2023 Dec. 8 [cited 2025 Dec. 4];8(2):142-55. Available from: https://e-journal.unair.ac.id/JKR/article/view/47647