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Fig. 1. Experimental layout of an experimental block in each of the four farmer-fields at Chikal, south-west Niger, 1997
Table 1
Fig. 2. Organic matter disappearance of cattle and sheep–goat manure applied in metallic cages of 4 mm mesh or in nylon bags of 100 �mmesh placed on the soil surface between 2 and 4 June 1997 at four sites in Chikal, south-west Niger
Fig. 3. Average decline of nitrogen (N), phosphorus (P) and potassium (K) concentration in cattle and sheep–goat manure during the first17 weeks after manure application at the onset of the rainy season at four sites in Chikal, south-west Niger
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