KYARI, U. S.; ISAH, U. A.; KYARI, A.; IBRAHIM, D.; ALHASSAN, N.; MARI, H. H.; HIGHINA, B. K.; MUSA, M. A.; GUTTI, B. Production of Bio-Fertilizer Grade Derived from Biochar and Agricultural By-Product. ARID ZONE JOURNAL OF ENGINEERING, TECHNOLOGY AND ENVIRONMENT, v. 22, n. 3, p. 617-634, 2 Sep. 2026.