. Absorption of vapors and gases by soils . Fig. 16.—Curve showing rate of evaporationPodimk soil. >f water from aLoc. cit. &Comp. !><). 741 (1880). cCameron and Gallagher, Bui. 50, Bureau of Soils. U. S. Dept. , L907. 44 ABSORPTION OF VAPORS AND GASES BY 8 16 24- 32 40 PERCENT OF AIOISTURE. Fig. 17.—Curve showing rate of evaporation of water fromMiami soil. and 3 we see this same bend in the rate of evaporation curves,which becomes less and less evident as the humidity of the atmos-phere of the soil approaches the saturation point, going from the par-tial pressure
. Absorption of vapors and gases by soils . Fig. 16.—Curve showing rate of evaporationPodimk soil. >f water from aLoc. cit. &Comp. !><). 741 (1880). cCameron and Gallagher, Bui. 50, Bureau of Soils. U. S. Dept. , L907. 44 ABSORPTION OF VAPORS AND GASES BY 8 16 24- 32 40 PERCENT OF AIOISTURE. Fig. 17.—Curve showing rate of evaporation of water fromMiami soil. and 3 we see this same bend in the rate of evaporation curves,which becomes less and less evident as the humidity of the atmos-phere of the soil approaches the saturation point, going from the par-tial pressure of water vaporof 94 per cent sulphuricacid up to that of thevapor pressure of wateralone. As was stated inBulletin 50, the moisturecontent of each of thesesoils at which this bend inthe rate of evaporationtakes place is in realityvery close to the contentof water in the soil whichgives it the best physicalcondition for plant reason for this agree-ment between the point at which the rate of evaporation changesand the point known as the optimum water content has been alsopointed out in Bulletin 50. The larger open spaces between the soilgrains naturally lose their water first, and the later portions ofwater evaporate more and more from the finer capillary spaces i
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