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Field experiments

Published online by Cambridge University Press:  27 March 2009

Reginald Arthur Berry  and
Daniel Grant O'Brien
Reginald Arthur Berry
Affiliation:
Professor of Agricultural Chemistry
Daniel Grant O'Brien
Affiliation:
Formerly of the Chemistry Department, now Lecturer in Agriculture, West of Scotland College of Agriculture, Glasgow.
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Extract

Single plot trials owing to the magnitude of the experimental errors, are practically useless as a test for comparing the yields of grain of one variety of oat with that of another. At best the results are only applicable to the particular experiment in question. For the old Scotch varieties of oat the probable error on trials of this kind amounts to about 18 per cent, of the yield of grain and to about 20 per cent, for the new varieties. Adopting single plot trials an 18 per cent, error means that when determining the superiority in the yield of grain of one variety over that of another and when the difference is not likely to be more than about 5 per cent, it would be necessary to have 214 centres with no duplication of plots at any centre in order to endeavour to obtain a conclusive result from a single year's trials. When the difference is likely to be about 10 per cent, it would be necessary to have 53 centres.

Data are supplied showing that the experimental error for different crops also for the grain and straw of the same crop is not the same. It is greatest for the grain and lowest for the hay crop.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 14 , Issue 3 , July 1924 , pp. 407 - 412
Copyright
Copyright © Cambridge University Press 1924

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References

page 407 note 1 Report on Experiments on the Comparative Merits of Varieties of Oats by R. P. Wright, Second, Third and Ninth Annual Reports, West of Scotland College of Agriculture.

page 408 note 1 Wood, T. B. and Stratton, F. G. M. “The interpretation of experimental results.” Journ. Agric. Set. 3, Part 4.Google Scholar

page 411 note 1 Mercer, W. B. and Hall, A. D. “The experimental error of Field Trials.” Journ. Agric. Sci. 4, p. 2.Google Scholar