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The value of a uniformity trial in field experimentation with rubber

Published online by Cambridge University Press:  27 March 2009

E. K. S. Murray
E. K. S. Murray
Affiliation:
(Rubber Research Scheme, Ceylon; Research Laboratories, Culloden, Neboda, Ceylon.)
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Extract

1. Sanders’ method of utilising previous crop records to correct experimental results by means of a linear regression is briefly described.

2. The method is applied to yield figures from rubber trees in Sumatra, and the precision of a dummy experiment is thereby increased nearly fourfold when the “preliminary” and “experimental” years are consecutive. When the “experimental” year is three years later than the “preliminary” year, the error variance of the adjusted yields is reduced to about a half.

3. It is concluded that not only has the method of correction been of value in the particular instance investigated, but that a uniformity trial utilised in this way should be of practical value in any major field experiments with rubber.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 24 , Issue 2 , April 1934 , pp. 177 - 184
Copyright
Copyright © Cambridge University Press 1934

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References

REFERENCES

(1)Sanders, H. G.J. Agric. Sci. (1930), 20, 63.Google Scholar
(2)Eden, T.J. Agric. Sci. (1931), 21, 565.Google Scholar
(3)Lord, L.Dept. of Agric. Ceylon Bull. No. 82.Google Scholar
(4)Fisher, R. A.Statistical Methods for Research Workers (4th edition), p. 252. Edinburgh, 1932.Google Scholar