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A simple procedure for the analysis of experiments on mixtures of varieties or species of agronomic interest

Published online by Cambridge University Press:  27 March 2009

F. Yates  and
Susan J. Dutton
F. Yates
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire, AL5 2JQ
Susan J. Dutton
Affiliation:
Rothamsted Experimental Station, Harpenden, Hertfordshire, AL5 2JQ
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Summary

This paper re-analyses three experiments for which results have previously been published. A simpler model for aggression, based only on the proportions of the component yields of the mixed plots, is adopted. This greatly simplifies the analysis, which requires only a straightforward application of least squares, and gives much more accurate estimates of competitive power. Omission of some combinations from the mixtures included in an experiment presents little extra difficulty.

Various secondary matters, some of which have implications for the design of experiments of this type, are discussed in the paper. Graphical plots which throw light on the effect of sole yield differences on competitive power are exhibited. A logarithmic transformation of the data, often used to equalize the variance, was found to lead to underestimation of enhancement.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 110 , Issue 1 , February 1988 , pp. 13 - 24
Copyright
Copyright © Cambridge University Press 1988

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References

Gleeson, A. C. & McGilchrist, C. A. (1978). Analysis of plant competition data from an incomplete mixture diallel experiment. Journal of Agricultural Science, Cambridge 91, 410–426.CrossRefGoogle Scholar
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