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A quantitative relation between soil and the soil solution brought out by freezing-point determinations

Published online by Cambridge University Press:  27 March 2009

Bernard A. Keen
Bernard A. Keen
Affiliation:
(Goldsmiths' Company's Soil Physicist, Rothamsted Experimental Station, Harpenden.)
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Extract

An examination has been made of some of the extensive experimental data obtained by Bouyoucos and his associates on the freezing-point depression of soil solution at varying moisture contents, examined in situ.

These workers find that the soil solution in quartz sand and extreme types of sandy soil obeys approximately the same law as dilute solutions—the freezing-point depression varying as the concentration, or in the present case, inversely as the moisture content. In other words

where K is a constant, and Dn is the freezing-point depression, at a moisture content of Mn. Soils do not obey this law, the freezing-point depression rapidly increasing as the moisture content decreases.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 9 , Issue 4 , October 1919 , pp. 400 - 415
Copyright
Copyright © Cambridge University Press 1919

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References

page 400 note 1 Michigan Agric. Coll. Expt. Station. Tech. Bulls. Nos. 24 (1915), 31 (1916), 36 (1917), 37 (1917), 42 (1918).

Also in Journ. Agric. Res. 8 (1917), p. 195; 15 (1918), p. 331.Google Scholar

page 401 note 1 Keen, B. A.. Journ. Agric. Sci. 6 (1914), p. 456.CrossRefGoogle Scholar

page 402 note 1 A summary of these methods is given by Bouyoucos (Tech. Butt. No. 24), and also by Stiles, and Jørensen, (Journ. Ecology, 2 (1914), p. 245)CrossRefGoogle Scholar. The latter is the more detailed account, but does not include the Morgan oil pressure method (Soil Sci. 3 (1917), p. 531).CrossRefGoogle Scholar

page 402 note 2 Journ. American Chem. Soc. 38 (1916), p. 588; 39 (1917), p. 1103.CrossRefGoogle Scholar

page 411 note 1 Actually, Fig. 3 represents a family of parabolae passing through the origin, with their axes inclined to the axes of co-ordinates.

page 411 note 2 A numerical example may make this clearer. Take as a special case of equation (13):

and let A, the constant, have the values 100 and 5. By simple calculation we then have, in the two cases:

This table shows that if A = 100, Zn decreases with Yn, while if A = 5 the value increases and then decreases.

page 413 note 1 U.S. Bureau of Soils. Bull. No. 50 (1908).