The document discusses long-term trials being conducted in Eastern, Western and Southern Africa to evaluate the effects of different organic matter amendments and inorganic fertilizers on maize, sorghum and millet yields. The trials include treatments of various organic residues like Tithonia, Calliandra, Crotolaria and Leucaena applied alone or combined with nitrogen fertilizer, compared to controls with only inorganic nitrogen or no fertilizer. Results over multiple seasons are presented for sites in Embu, Kenya, Domboshawa, Zimbabwe and Kwadoso, Ghana.
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