Published online by Cambridge University Press: 27 March 2009
A study has been made of the intensity of the forces binding soil particles together, when the soil has been previously subjected to treatments simulating various field conditions, and certain laboratory processes connected with physical, chemical and biological investigations.
The technique adopted consisted in shaking soil with water under reproducible conditions, allowing the mixture to stand for 24 hours, and then determining the concentration of soil in the top 8·5 cm. of the suspension. This concentration was expressed as a percentage of the original concentration of the soil, and the value thus obtained was called the dispersion factor of the soil under the given conditions of treatment.
page 147 note 2 Bull. 352 (1914), Cornell Univ. Coll. of Agriculture, U.S.A.
page 148 note 1 14th Report Woburn Experimental Fruit Farm (1914).
page 148 note 2 Proc. 4th Int. Conference of Pedology, Rome, 1924.
page 149 note 1 In the bulk of the experiments 5 gm. of soil (reckoned on oven-dry weight) in 500 c.c. of water were used, but it was difficult, if not impossible, to keep exactly to this weight in some of the series.
page 149 note 2 Loc. cit.
page 149 note 3 Any soil described in this paper as “leached” has been subjected to continuous percolation with distilled water in a Buchner for 2–3 weeks, in order to remove the bulk of the soluble salts present in the soil solution.
page 155 note 1 Puri, Crowther and Keen, loc. cit.
page 155 note 2 Comber, loc. cit