ABSTRACT
The extreme variability in rainfall, long dry seasons and recurrent droughts, floods, and dry spells pose a key challenge to food production. The sole dependence of farming on rainfall has been a major cause of low food productivity, food shortages, undernourishment and famine in sub-Saharan Africa. The world’s hotspots for hunger and poverty are concentrated in the arid, semiarid and dry subhumid regions of the world which depend solely on rainfall for crop production.
