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Published online 1 January 1990
Published in Agron J 82:138-143 (1990)
© 1990 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Comparison of Models for Describing; Corn Yield Response to Nitrogen Fertilizer

M. E. Cerrato and A. M. Blackmer*

Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

* Corresponding author.

Decisions concerning optimum rates of fertilization directly or indirectly involve fitting some type of model to yield data collected when several rates of fertilizer are applied. Although several different models are commonly used to describe crop yield response to fertilizers, it is seldom explained why one model is selected over others. The objective of the work reported here was to compare and evaluate several models (linear-plus-plateau, quadratic-plus-plateau, quadratic, exponential, and square root) commonly used for describing the response of corn (Zea mays L.) to N fertilizer. The evaluation involved 12 site-years of data, each having 10 rates of N appied preplanting. AH models fit the data equally well when evaluated by using the R2 statistic. All models indicated similar maximum yields, but there were marked discrepancies among models when predicting economic optimum rates of fertilization. Mean (across all site-years) economic optimum rates of fertilization as indicated by the various models ranged from 128 to 379 kg N ha–1 at a common fertilizer-to-corn price ratio. Statistical analyses 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 observed in this study. The results clearly show that, especially amid increasing concerns about the economic and environmental effects of overfertilization, the renson for selecting one model over others deserves more attention thun it has received in the past.

Journal Paper J-I3I40 of the Iowa Agric. and Home Econ. Exp. Stn., Ames. Project 2741. This work was supported in part from the Fertilizer Trust Account of the Iowa Dep. Agric. and Land Stewardship and in part by the Integrated Farm Management Demonstration Program of The Agricultural Energy Management Fund, State of Iowa, through the Iowa Dep. Agric. and Land Stewardship.

Received for publication July 18, 1988.


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