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Search results on 05/19/13
1257. Cerrato, M.E. and A.M. Blackmer. 1990. Comparison of models for describing corn yield response to nitrogen fertilizer.. Agron. J. 82:138-143.
The study compares and evaluates several models (linear-plus-plateau, quadratic-plus-plateau, quadratic, exponential, and square root) commonly used for describing corn response to N fertilizer. All models indicated similar maximum yields, but there were marked discrepancies among models when predicting economic optimum rates of fertilization. Statistical analysis indicated that the most commonly used model, the quadratic model, did not give a valid description of the yield responses and tended to indicate optimal rates of fertilization that were too high. The quadratic-plus-plateau model best described the yield responses.