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Estimation of Asymptotic Rotation and Nitrogen Effects¹

Synopsis: Time rates of change in corn yields under nitrogen fertilization in a long term experiment are estimated. The experiment includes four rotations, each containing two years of corn and from zero to three years of meadow. Three levels of nitrogen are applied to the corn in each rotation. A model is presented which is characterized by the measuring of time in terms of rotation cycles and by the assumption of an exponential approach to a limiting value.

² Associate Professors of Statistics, Iowa State University. Appreciation is expressed to Professors W. D. Shrader and John Pesek, Dept. of Agronomy, for the helpful comments received throughout the course of this study.

Received for publication September 30, 1964.