A survey of 45 sustainable agriculture initiatives spread across 17 African countries covering some 730,000 households revealed that agroecological approaches substantially improved food production and household food security. In 95 percent of the projects, cereal yields improved by 50 to 100 percent
Pretty, J 2004. Can sustainable agriculture feed Africa? New evidence on progress, processes and impacts. Environment, Development and Sustainability 1: 253-274.