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Heterogeneity of variance in field experiments: some causes and practical implications

Published online by Cambridge University Press:  27 March 2009

P. Krajewski
P. Krajewski
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts, AL5 2JQ, UK
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Summary

Data from 62 field experiments on various crops in 1973–85 at Rothamsted Experimental Station were used to obtain knowledge about the heterogeneity of variance of yield. The results suggest that explaining heterogeneity of variance in terms of a mean–variance relationship is inadequate; better understanding of the patterns of changing variance can be gained by investigating the influence of the experimental factors on the variance. The effects of the factor ‘amount of nitrogen’ on mean yield and on the variance were positively correlated; factors which tend to affect variability but not the mean were identified. Suggestions are given for controlling variance but the need for further experimental evidence is emphasized.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 115 , Issue 1 , August 1990 , pp. 83 - 93
Copyright
Copyright © Cambridge University Press 1990

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