The impact of farmer-managed natural regeneration on maize health and yield productivity in semi-arid Kenya

Farmer-managed natural regeneration (FMNR) practice aims to improve maize health and increase maize yield in semi-arid areas in Kenya. Under the practice, farmers select and manage trees regeneration in their farmlands while growing maize. Whereas FMNR practice is known to contribute to food security, income diversification, and increased employment opportunities, its beneficial contribution to maize farmers in Nyatike, Kenya, has not been researched. This study applied a quantitative field survey design using the Land Degradation Surveillance Framework technique for its hierarchical sampling design. The area of study is divided into seven (7) blocks (sites) represented by wards of Nyatike Sub-County. Forty-five (45) farmers were randomly selected to participate in the study. In each selected farm, maize under different tree canopies was considered to be treatment sites (TT) while those in the open (not under the tree canopies) were considered as controls (NT) using a block sampling design. Maize plant growth was monitored with measurements of height, number of leaves, diameter of maize stalk taken at intervals, and finally, maize yield after harvesting. The results show no significant difference in height, number of leaves, or diameter of maize stalk between the treatment and controls. Farms under FMNR practice had relatively higher yield compared to non-treatment, with an equivalent increase in maize yield of 1,432.18 kg/ha. There is a need for research on high-performing tree species to be carried out to improve both biodiversity and maize yield, thus presenting a sustainable model for restoring land and increasing food security in dryland areas.