Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 7:335-337 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Use of Control Plots in Yield Trials1

R. J. Baker and R. I. H. McKenzie2

Theoretical considerations based on Smith's coefficient of soil heterogeneity suggest that the use of systematically arranged control plots as fertility indexes in yield trials is of questionable value. Data from a 2-year study in Avena sativa L. support this conclusion. It is shown that analyses of covariance will avoid the possibility of overadjustment of yields in relation to a fertility index.

Key Words: fertility index • soil heterogeneity • covariance

1 Contribution No. 243, Canada Agriculture Research Station, Winnipeg, Can.

2 Population geneticist and oat breeder.






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Copyright © 1967 by the Crop Science Society of America.