teriorate the soil physico-chemical conditions of the often physically and chemically fragile moist savanna soils Nutrient depletion is a major constraint to crop production for in the long term, especially in the case of ammonium moist savanna soils, and inputs of nutrients are required to overcome sulfate [(NH 4 ) 2 SO 4 ] (Pieri, 1992). This observation, tothis constraint. The impact of sole and combined applications of organic inputs (OIs) [fresh tree prunings, Pueraria phaseoloides (Roxb.) Recherche Agronomique, B.P. 1026, Lomé , Togo; J. Diels, N. Sanginga, and O. Lyasse, RCMD, IITA, Ibadan, Nigeria, c/o L.W. Lam-al., 1997), most trials in the West African moist savanna bourn and Co., 26 Dingwall Rd., Croydon CR9 3EE, UK; R. Merckx, deal with manure or crop residues as a source
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