. Agriculture for southern schools. he Amounts of Liquid required to moisten the Sur-EACE of Every Pebble in the Tumbler on the Left and of EveryGrain of Sand in that on the Right over its entire surface with the thinnest possible coat ofmoisture requires a large amount of water (Fig. 43). Movements of free and of capillary moisture. — Thefarmer endeavors to remove a part of the free water fromthe soil by drainage and to retain in the soil as much cap-illary moisture as possible. He desires the free water todrain away, because it occupies the spaces between thesoil grains and thus keeps out th
. Agriculture for southern schools. he Amounts of Liquid required to moisten the Sur-EACE of Every Pebble in the Tumbler on the Left and of EveryGrain of Sand in that on the Right over its entire surface with the thinnest possible coat ofmoisture requires a large amount of water (Fig. 43). Movements of free and of capillary moisture. — Thefarmer endeavors to remove a part of the free water fromthe soil by drainage and to retain in the soil as much cap-illary moisture as possible. He desires the free water todrain away, because it occupies the spaces between thesoil grains and thus keeps out the air, which is needed bythe roots. Free water moves only toward a lower level; MOISTURE IN THE SOIL 6/ but capillary moisture on the other hand moves in anydirection, but always very slowly. This is an advantage,for if this moisture moved as rapidly as the free water itwould rise to the surface and evaporate. The earth wouldthen become so dry that plants would die (Fig. 44). It is also fortunate for the farmer that the capillary. Courtesy of Doubleday, Piige & Cu Fig. 44. — Outfit foe showing the Heights to which Capillary Moisture RISES in Soils moisture moves toward the dryest soil. Thus root-hairs lying in contact with the sheet of water that wraps up one soil grain, absorb a large part of this moisture, but its 68 AGRICULTURE
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu, booksubjectagriculture
