Proyecto sobre Políticas para la Gestión Ambientalmente Adecuada de Residuos, Fase II
Seminario Regional sobre Avances y Perspectivas de la Gestión Ambientalmente Adecuada de los Residuos Urbanos e Industriales
Seminario Regional sobre Avances y Perspectivas de la Gestión Ambientalmente Adecuada de los Residuos Urbanos e Industriales
This series of African compendium of environment statistics, presents environmental and environment –related data for the African region.
The mission was in accordance with Programme Element 20.48 of the approved United Nations Regular Programme for Technical Cooperation for the 1994-1995 Biennium which calls for the provision of advisory services and training to member countries and inter-governmental organizations in support of their efforts at developing their agricultural support services.
The goal of the workshop was to identify strategic investments and policy actions that African Governments, firms, and organizations can undertake, with the support of their development partners, to foster agricultural and economic transformation in Africa. The workshop focused on forces that will influence the evolution of African economies well into the 21st Century. The emphasis was not simply on the impact of structural adjustment programmes but rather on the broader process of economic adjustment that would lead to more productive economic systems.
In the Sahelian rangelands biomass production is constrained by soil moisture in the drier (100-250 mm) parts and by soil nutrients in the wetter parts. Similarly, for a given Sahelian range, nutrient deficiency would be more prominent in good than in poor rainfall years. To test this hypothesis, fertiliser trials were carried out at sites distributed along the bioclimatic gradient in the Gourma (Mali) over contrasting rainfall years between 1988 and 1992.
The integration of crops and livestock has often been cited as a model for agricultural development in semi-arid West Africa. Recent formulations treat the adoption of more intensive forms of manuring as a critical step in agricultural development. These analyses have been criticised for ignoring or underestimating the possible negative consequences of such management on rangeland and livestock productivity. This paper critically examines this debate. It is argued that the agronomic benefits of manuring depend largely on nutrient transfers from non-cropped grazing lands.
The papers are grouped into four categories: land management practices for intensive agriculture; overcoming soil constraints; technology adoption; and planned research and development.
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