Abstract
Crop rotation with legumes and fallow has been known to enhance soil fertility and crop productivity. This prompted an investigation into the effects of some legumes and fallow on some soil chemical properties and yield of maize. The study was conducted in 2001 and 2002 on an Alfisol to determine the effects of crop rotation with grain legumes, soybean and cowpea; herbaceous legume, Centrosema pascuorum and a natural fallow on some soil chemical properties and grain yield of succeeding maize. The legumes and fallow field were established in 2001. In 2002, maize was the test crop with 0, 20, 40 and 60 kg N ha-1 in a split-plot arrangement fitted to a randomized complete block with the legumes and fallow as the main plot and N fertilizer rates as subplot. Results showed that all legumes and fallow treatments reduced soil pH with significant (P0.05) positive total N credit. Soybean and cowpea treatments depleted while Centrosema and fallow treatments increased soil available P. The soil exchangeable Ca, Mg, K, were all decreased by the treatments. Cowpea significantly (P
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