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Designs for controlling interplot competition in variety trials

  • O. David (a1), R. A. Kempton (a2) and I. M. Nevison (a2)

Summary

Interplot competition in crop variety trials leads to biased estimates of variety differences. Modified alpha designs are proposed which aim to control competition by restricting the randomization so that adjacent varieties show similar competition effects. The designs are available in the computer program Alpha +.

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Kempton, R. A. & Lockwood, G. (1984). Inter-plot competition in variety trials of field beans (Vicia faba L.). Journal of Agricultural Science, Cambridge 103, 293302.
Monod, H. & Bailey, R. A. (1993). Valid restricted randomization for unbalanced designs. Journal of the Royal Statistical Society B 55, 237251.
Nevison, I. M. & Law, J. R. (1995). Applications of designs to control interplot interference in variety trials. Aspects of Applied Biology 43, 1924.
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Williams, E. R. & Talbot, M. (1993). Alpha +, Experimental Designs for Variety Trials. CSIRO, Canberra and SASS, Edinburgh.

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Designs for controlling interplot competition in variety trials

  • O. David (a1), R. A. Kempton (a2) and I. M. Nevison (a2)

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