Western Kenya is one of the most densely populated areas in Africa. Farming there is characterized by low inputs and low crop productivity. Poverty is rampant in the region. Yet the potential for agriculture is considered good. In the study described here, researchers looked specifially at soil fertility replenishment (SFR) systems...Focused on two specific systems -- the tree-based "improved fallow" system and the biomass transfer system -- the study compared rates of adoption in poor and nonpoor communities and evaluated the extent to which their adoption reduced poverty.