Agriculture is an integral part of the African economy. For example, in South Africa, the most developed African country, besides the presence of huge mining and industrial sectors in the country, the agricultural sector plays an important role in the economy. The agricultural sector contributes up to 8% of the Gross Domestic Products (GDP) of South Africa, which is a net exporter of agricultural products. The many agricultural cooperatives suggest the importance of this sector towards the socio-economic development in the country (About South Africa, 2001). In many African states, agriculture is the backbone of the economy employing about 60% of African workers. Three-fifths of African farmers are poor subsistence farmers (Wikipedia, 2001).