For several decades, a diverse literature has claimed that urban agriculture has the potential for hunger and poverty alleviation. This article reviews empirical data from equatorial Africa that touch on this assertion, updating the work on the subject published in the mid-1990s. Research, largely from East Africa but also including Cameroon in West Central Africa, appearing in several recent and currently emerging publications is assessed and compared. The article attempts to quantify the extent of urban agriculture in several cities based on the proportion of urban households involved, and assesses its statistical and qualitative relationship to urban food and nutrition security as well as its complex relationship to poverty. The role of urban agriculture in closing eco-cycles is discussed in important new data from three cities on how organic solid waste is, or is not, being re-used. Recent efforts in policy-making in three East African cities are reviewed, prior to making a policy analysis. The article concludes that the scale and extent of urban agriculture is increasing with, or perhaps in excess of, urban growth according to available data, and that it is beneficial to human health as well as to hunger and poverty alleviation. Urban livestock production and land availability are particularly beneficial. Poverty alleviation through urban agriculture could be both better understood and supported by appropriate policy measures, since better-off households are currently benefiting more from urban agriculture than the majority of poor households. Nutrient cycling through urban agriculture is enhanced by small mixed crop-livestock farms, which are the "backbone of urban farming systems". Recent policy measures emerging in the region suggest positive future direction.KEYWORDS gender / household food security / policy analysis / poverty / quantifying urban agriculture / urban eco-cycles

ResumeFonde sur les conclusions d'une enqu~te recente entreprise par l'Institut Mazingira de Nairobi, cet article analyse le caractere de ]'agriculture urbaine dans les villes du Kenya. I.: accent est mis sur le ravitaillement en nourriture en tant qu'element de l'economie informelle urbaine. I.: agriculture, basee sur les cultures et le betail est une activite commune frequemment rencontree dans les centres urbains en Afrique. Bien que consideree de peu d'importance par les urbanistes et les intellectuels, 1' agriculture urbaine est un element cle de l'economie des menages pauvres. Une telle agriculture lutte pour obtenir la terre, la main d'oeuvre et les ressources et renferme un aspect vital de 1' economie et du pays age urbains de la ville africaine. Selon cet article, la theorie urbaine africaine doit incorporer cet element de la realite urbaine d'une importance capitale.

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