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A study in sampling technique: the effect of artificial fortilisers on the yield of potatoes

Published online by Cambridge University Press:  27 March 2009

J. Wishart  and
A. R. Clapham
J. Wishart
Affiliation:
(Rothamsted Experimental Station, Harpenden, Herts.)
A. R. Clapham
Affiliation:
(Rothamsted Experimental Station, Harpenden, Herts.)
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Extract

(1) The desiderata of a sampling-method are outlined, and the particular case of sampling a large number of potato plots discussed.

(2) An analysis is made of the yields of 54 sub-plots of the Rothamsted Potato Experiment of 1928, both as estimated by a sampling-method and as determined by large-scale lifting.

(3) It is shown that most of the significant results of the experiment are obtained from the sample-yields, but that the higher standard error per plot obscures the effect of superphosphate.

(4) It is concluded that at Rothamsted 102, and at Woburn 56, plants would have to be lifted to give a sampling-error as small as 4 per cent. It would then be profitable only to sample experimental plots of 1/20th acre or more in area.

Finally it is a pleasure to record our indebtedness to Dr R. A. Fisher for much valuable advice and criticism: and to Mr H. J. G. Hines for assistance with the field work.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 19 , Issue 4 , October 1929 , pp. 600 - 618
Copyright
Copyright © Cambridge University Press 1929

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References

REFERENCES

(1) Eden, T. and Fisher, R. A. Studies in Crop Variation. IV. The Experimental Determination of the Value of Top Dressings with Cereals. J. Agric. Sci. (1927), 17, 548. (Rothamsted Memoirs, 13.)Google Scholar
(2) Clapham, A. R. The Estimation of Yield in Cereal Crops by Sampling Methods. J. Agric. Sci. (1929), 19, 214–35.Google Scholar
(3) Fisher, R. A. Statistical Methods for Research Workers. 2nd ed. Edinburgh: Oliver and Boyd, 1928.Google Scholar
(4) Wishart, J. The Generalised Product Moment Distribution in Samples from a Normal Multivariate Population. Biometrika (1928), 20 A, 43.Google Scholar
(5) Engledow, F. L. A Census of an Acre of Corn. J. Agric. Sci. (1926), 16, 191.CrossRefGoogle Scholar