. Absorption of vapors and gases by soils . ;> i. ] 1 DRY SOIL. 0. 0097. 00 i i \ ABSORPTION OF WATElt VAPOE. 19 Discussion. Evaporation from soils under different conditions of humidity ingeneral proceeds regularly, as shown hy the above curves, which arcsimilar in form. The curves for Sea Island soil over per ecu Isulphuric acid and over the co
. Absorption of vapors and gases by soils . ;> i. ] 1 DRY SOIL. 0. 0097. 00 i i \ ABSORPTION OF WATElt VAPOE. 19 Discussion. Evaporation from soils under different conditions of humidity ingeneral proceeds regularly, as shown hy the above curves, which arcsimilar in form. The curves for Sea Island soil over per ecu Isulphuric acid and over the concentrated acid (fig. 3) are displacedto the left in their lower portions. This effect is almost certainlydue to the fact that the samples of quartz, Sea Island, and Podunksoils were run in the same desiccator. The latter two soils holdingless water, reached the dry state first, and when they no longer gaveup water to the surrounding atmosphere the rate of evaporation forSea Island cotton soil increased, thus producing the displacement in. TIMC Fig. 3.—Curves for Sea Island cotton soil, showing eiTeet of humidity upon rate of evaporation. the curve. This observation emphasizes the necessity of closelyregulating the conditions for evaporation studies. The influence of the presence of organic matter in a soil is shownby a comparison of the evaporation curves for quartz, Podunk,and Sea Island soils over concentrated sulphuric acid. The pres-ence of organic matter in Sea Island soil increases its water-holdingpower some 25 per cent above that of quartz or Podunk soil, but itdoes not decrease the rate of evaporation, for the Sea Island curvesare very nearly parallel to those for Podunk fine sandy loam and forquartz. 20 ABSORPTION OF VAPORS AND GASES BY SOILS. The foregoing study is important in that it gives a valid basis forapplying the experimental results determined for one humidity con-dition to any other humidity condition. Because of the high rateof evaporation and slow chan
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