ABBA, S. A.; ABUBAKAR, H. K.; KARIMATU, U. A.; SULE, I. D. USAGE AND EFFECTIVENESS OF FERTILITY ENHANCEMENT TECHNIQUES AMONG SMALL-HOLDER FARMERS IN THE KANO CLOSE SETTLED ZONE, KANO STATE. FUDMA JOURNAL OF SCIENCES, v. 4, n. 1, p. 69 - 75, 13 Apr. 2020.