This study is an assessment of the determinants of micro irrigation adoption for maize production in smallholder irrigation schemes. The focus of the study was on Hama Mavhaire irrigation scheme in Midlands Province, Zimbabwe. An assessment of the major production constraints in the scheme was carried out, factors that influence the decision to adopt micro irrigation for maize production identified, the extent of adoption of micro irrigation for maize production and the contribution of micro irrigation to maize yields were determined.