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Studies in soil cultivation. II. A test of soil uniformity by means of dynamometer and plough

Published online by Cambridge University Press:  27 March 2009

William B. Haines  and
Bernard A. Keen
William B. Haines
Affiliation:
(Soil Physics Department, Rothamsted Experimental Station, Harpenden.)
Bernard A. Keen
Affiliation:
(Soil Physics Department, Rothamsted Experimental Station, Harpenden.)
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Extract

Measurements are recorded of soil resistance to ploughing, taken with a view to testing the uniformity of a soil over a single field. The results have been examined for significance and indicate large variations over short distances. The differences have been represented by means of isodyne contours (i.e. lines of equal drawbar pull), drawn on a map.

The importance is emphasised of assuming and allowing for such variations before drawing conclusions from the drawbar pull recorded by different implements.

Preliminary work is described showing that the variations are correlated with clay content and also with the growth of a crop in its early stages.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 15 , Issue 3 , July 1925 , pp. 387 - 394
Copyright
Copyright © Cambridge University Press 1925

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References

page 387 note 1 Mercer, W. B. and Hall, A. D.. This Journal, 4, 1911, p. 107.Google Scholar

page 389 note 1 The derivation of this word is obvious; Mr P. H. H. Gray, of this station, kindly made an exhaustive search for a possible alternative, but nothing more suitable was found.

page 393 note 1 This Journal, 14 (1924), p. 370.Google Scholar