Materials and Methods
1.2.1. Site Selection
Experimental sites were selected from four counties in central Kenya namely Murang’a South, Nyeri, Kirinyaga and Embu. The project set up is to selecting twenty farms [four farms (replicates) x 5 clusters] per county in four counties of central Kenya all making a total of 80 on-farm trials. The cluster represents five relatively different sites while the four farms in a cluster are the replicates of the trial.
However, for the first cropping season of the project it was only possible to manage to select a total of 56 farms. Selected counties and farms are presented in Table 1.