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Estimates of Optimum Plot Size and Shape and Replicate Number for Forage Yield of Alfalfa-Bromegrass Mixtures¹

Synopsis: Increasing plot length was more efficient than increasing plot width to reduce variation among plots for forage yield of alfalfa-bromegrass mixtures. Estimates of optimum plot size and replicate number to detect differences among treatments were similar, using the coefficient of variability and Smith's b. Greater efficiency and less variation in the relative costs of plots of different sizes were observed for the lattice as compared with the randomized complete block designs.

² Professor of Agronomy; formerly assistant Professor of Branch Stations (now with International Voluntary Services, Inc., Vietnam); and Superintendent Ashland Branch Experiment Station. Acknowledgment is made to the Numerical Analysis Laboratory, University of Wisconsin, for making some of the statistical calculations.

Received for publication September 25, 1962.