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This study investigated fertilizer use among arable crop farmers in Osogbo Agricultural Development Programme
(ADP) zone of Osun State, Nigeria. Specifically, it identified and quantified the determinants of fertilizer use among
arable crop farmers, in Osun State, Nigeria. Multi stage sampling technique was used to select 120 arable crop
farmers while structured questionnaire was used to obtain information on their socio-economic characteristics, types
and quantity of fertilizer used, farm characteristics, and expenditure on fertilizer. The results showed that 76.65%,
4.35% and 6.09% farmers respectively had expenditure on solely inorganic, organic and combination of inorganic
and organic fertilizers, while 13.91% were non-fertilizer users. The multiple linear regressions revealed that sex of
farmer, farming experience, level of education, fertilizer type, extension visits, land tenure status and quantity of
fertilizer used, positively influenced expenditure on fertilizer while farm income had a negative relationship. The
result indicated a positive response to fertilizer use by farmers and the need for national policy on fertilizer to
effectively address the problem of physical and economic access of fertilizer to farmers in good time.
Keywords: Fertilizer use, farm expenditure, arable crop farmers.