The document discusses long-term trials being conducted in Eastern, Western and Southern Africa to evaluate the effects of different organic matter amendments and mineral fertilizers on maize, sorghum and millet yields over multiple seasons. The trials are taking place in Kenya, Zimbabwe and Ghana and include treatments of organic residues like Tithonia, Calliandra, Crotalaria and Leucaena as well as manure, compost and mineral fertilizers applied to maize, sorghum and millet-based cropping systems.
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