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A factorial experiment with a randomised complete block design (three replicates) was performed to determine theeffects of poultry manure (PM), lime (L) and NPK 15-15-15 fertilizer on soil chemical properties, and to determine theeffects of their combinations on soil productivity and maize yield. The factors were PM (0, 5 and 10 Mg ha-1), L as CaCO3(0 and 250 kg ha-1) and NPK 15-15-15 (0 and 100 kg ha-1). The soil had a loamy sand texture. The application of L andPM increased the surface soil pH in a similar fashion. In both years of the experiment, the effective cation exchange capacity(ECEC) of the soil after the combined application of 10 Mg ha-1 PM, L and NPK was significantly higher than afterthe individual application of L or NPK or their combination (5.75-7.65 cmol kg-1 compared to 3.36-4.57 cmol kg-1). Theapplication of 10 Mg ha-1 PM with L and/or NPK reduced the possibility of Mn toxicity, with soil levels ranging from 108to 136 mg kg-1. The combined use of the three amendments gave the highest leaf nutrient concentrations. The highest maizegrain yield (4.62 Mg ha-1) was obtained with L + 10 Mg ha-1 PM; with no amendment the grain yield was 1.9 Mg ha-1. Theapplication of PM enhanced the effects of L and NPK in improving soil productivity. However, separate applications of 5and 10 Mg ha-1 PM similarly affected soil productivity; the sandy nature of the soil at depths of 0-20 cm seems to haveprevented differences between the two rates from becoming manifested.

Soil chemical properties and maize yield after application of organic and inorganic amendments to an acidic soil in Southwestern Nigeria