the greatest factor deteriorating soil organic matter (SOM) in smallholder farms. With an aim
to breaking this norm, a 2-year field trial intercropping potato with two legumes: lima bean
(Phaseolus lunatus) and dolichos (Lablab purpureus), was conducted in the upper-midland
(1552 meters above sea level (masl.)), lower-highland (1854 masl.) and upper-highland
(2552 masl.) agro-ecologies of Kenya. Residues from each cropping system were quantified …