Moisture content and physical condition of soils . 11 .022 22. 7 .021 . 0225 7. IS . 022 . 0265 . 022 .0255 . 022 . &2<\ From the table it will be seen that the saturation point at whichthe measurements were started was about 33 per cent moisture con-tent. As the sample dried out there was a gradual decrease in volumeuntil about 18 per cent of water was reached when the contractionhad amounted to per cent of the original volume. From this pointon there was very little, if any. contraction in volume over many
Moisture content and physical condition of soils . 11 .022 22. 7 .021 . 0225 7. IS . 022 . 0265 . 022 .0255 . 022 . &2<\ From the table it will be seen that the saturation point at whichthe measurements were started was about 33 per cent moisture con-tent. As the sample dried out there was a gradual decrease in volumeuntil about 18 per cent of water was reached when the contractionhad amounted to per cent of the original volume. From this pointon there was very little, if any. contraction in volume over many percent decrease in moisture content. When the soil reached about 6per cent moisture content, however, a more rapid volume decreasecommenced. At 2 per cent of water the volume decrease had reached13779—Bull. 50—OS 3 34 MOISTURE CONTENT AND CONDITION OF SOILS. per cent of the original volume. These data are shown in anotherform in figure 11, where the moisture content is platted as abscissaand the per cent volume decrease as 2 4-6 & 10 12 14 16 18 20 22 24 26 28 30 32 34 PER CENT OF MOISTURE. Fig. 11.—Volume-moisture results for Podunk fine sandy loam by the micrometer method. In Table XIX and figure 12 is given a series of measurements madeby the glass-tube method, and these show the same variations asdo the previous measurements. Table XIX.—Volume-moisture relations for Podunk fine sandy loam.[Length of soil column, 10 centimeters.] Moisture. Linear de-crease. Volumedecrease. Moisture. Linear de-crease. Volumedecrease. Per Per cent. .48 .50 .50 Per Per The total percentage decreases are not the same b}^ the two was pointed out in the chapter on penetration, the absolute M values of these changes have no significance, but only therelation between the watercontent and the propertybeing studied. It is to benoticed, however, that themeasu
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