"Fifty percent of the population in Nigeria live in rural areas. About 25 percent of Nigerians depend on agriculture and women make up about 38 percent of agricultural workers. About 90 percent of the agricultural output comes from the smallholder sector. Typical farm sizes range from 0.5 ha in the densely populated high-rainfall south to 4 ha in the dry north. An estimated six percent of the total population is undernourished (as of 2007), down from nine percent in 2002 surveys. Malnutrition in children is high: 29 percent are underweight, and 38 percent suffer from stunting."
Source: FAO Country Profiles: Nigeria