. Soils, their properties and management. Soils. THE FORMS OF SOIL WATER 205 moisture was determined by exposing the air-dry soil at 15° C. to a saturated atmosphere and then drying at 200° C, illustrate this point: — Hygroscopic Capacity op Various Soils Soils 15 clays . 7 clay loams 9 loams . 4 sandy loams 4 sands . Per cent M \TrEi vL, Rbmain- ixG IN Suspension iB^TFR Standing FOB 24 Hours. Hygroscopic Water ExPREbsED IN PERCE^TAGES Apparently, the finer the soil, the greater is the hygro- scopicity. The finer the soil, the higher also is the per- centage of clay,
. Soils, their properties and management. Soils. THE FORMS OF SOIL WATER 205 moisture was determined by exposing the air-dry soil at 15° C. to a saturated atmosphere and then drying at 200° C, illustrate this point: — Hygroscopic Capacity op Various Soils Soils 15 clays . 7 clay loams 9 loams . 4 sandy loams 4 sands . Per cent M \TrEi vL, Rbmain- ixG IN Suspension iB^TFR Standing FOB 24 Hours. Hygroscopic Water ExPREbsED IN PERCE^TAGES Apparently, the finer the soil, the greater is the hygro- scopicity. The finer the soil, the higher also is the per- centage of clay, and consequently the greater is the amount of material likely to be present in a colloidal state. As a matter of fact, the hygroscopic moisture as show^n above is roughly proportional to the clay; and as clay, espe- cially the finer forms, is largely colloidal in nature,** the colloidal content of a soil practically determines the hygro- scopic content. This fact is the basis for Mitscherlich's ^ method of colloid estimation, in which hygroscopic mois- ture determined under certain controlled conditions is used as a relative measure of colloidal content. The vari- ous grades of particles constituting the textural make-up of a soil, then, do not possess the same weight in the deter- mination of hygroscopicity, the dominant grade being clay, especially that part which has, by either physical 1 Mitscherlieh, E. A. This text, paragraph Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyon, T. L. (Thomas Lyttleton), 1869-1938; Fippin, Elmer O. (Elmer Otterbein), 1879-1949; Buckman, Harry Oliver, 1883-. New York, Macmillan
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