The response of N on maize in fifteen soils viz., ten low N soils and five medium- N soils with N at 0, 67.5, 135 and 202.5 kg/ha revealed that the responses were quadratic in medium N soils and sigmoid in low N soils. The optimum dose for grain and straw yield was 148 and 173 Kg N/ha respectively in medium N soil.
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