Yield and quality of crop produced depend on the quality of seed planted. This assertion is true under a conducive agroecological climate which is gradually fading away due to climate-change (CC) challenges. The use of adaptation and mitigation (AM) strategies expected to reduce its effect is low. Therefore, this study examined effect of CC AM on maize yield in south-east Nigeria. Multi-stage sampling procedure was adopted in selecting sample for the study. First stage adopted simple random sampling technique to select three States. Second stage used purposive sampling technique to select three Local Government Areas (LGA) from each state. Third stage applied, simple random technique to select three communities from the LGAs. Fourth stage applied a simple random technique to select 300 maize farmers for the study. Data was analyzed using AM index, independent t-test and linear regression analysis. Mean yield of maize for high adaptation was 958.30 kg per plot and433.54 per plot for low adaptation, the t value 5.4E+03 was significant at 1% while the mean yield of maize for high mitigation was 845.42 kg per plot and573.84 kg per plot for low mitigation strategies usage with t value=990.22 and significant at 1%.Determining the effects of the socioeconomic factors on maize yield with respect to (wrt) CC adaptation and mitigation organic manure (p <0.001), frequent weeding (p <0.001), late planting (p <0.01) row /ridge planting (p <0.01) and early planting (p<0.01), farm size (p <0.0001), afforestation (p <0.0001); Taunya farming (p <0.001); and frequent weeding (p <0.0001) positively and significantly influenced maize yield.
The study recommends provision of infrastructural facilities for CC mitigation and adaptation, farmland availability and use of sustainable agricultural practices to improve yield.