A field experiment was carried out to evaluate the effect of irrigation and soil amendment. (NPK and poultry manure) on the performance of maize and the impact on soil chemical properties at Isampou, Bayelsa State, Nigeria. The experiment design was split-plot fitted into randomized complete blocks. Irrigation regimes (20,000; 25,000 and 30,000 l ha-1 + NPK 200kg ha-1) were assigned sub-plots. These treatments were replicated four times culminating into 12 treatment combinations. Soil analysis results showed that application of OM and NPK + OM at different levels of water improved available P. Other chemical parameters were not significantly affected. Irrigation rates did not seen to have a
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