1 23 Nutrient Cycling in Agroecosystems (formerly Fertilizer Research) ISSN 1385-1314 Volume 90 Number 3 Nutr Cycl Agroecosyst (2011) 90:321-330 DOI 10.1007/ s10705-011-9432-6 Effect of the integrated use of legume residue, poultry manure and inorganic fertilizers on maize yield, nutrient uptake and soil properties A. O. Amusan, M. T. Adetunji, J. O. Azeez & J. G. Bodunde