. Principles of agricultural chemistry [microform] . rface waterdepends upon {a) the character and condition of the soil; {h)the slope of the land; (c) the amount and duration of the rain-fall. If the soil is loose and porous, either naturally, or renderedso by cultivation, a larger amount of water will penetrate it. Theslope of the land determines the rate at which the water runs oft;the shorter the time of contact between soil and water, other^ Warington, Phjsical Properties of the SoiL THE SOIL AND WATER 143 things being equal, the smaller will be the amount of waterabsorbed by the soil. Th
. Principles of agricultural chemistry [microform] . rface waterdepends upon {a) the character and condition of the soil; {h)the slope of the land; (c) the amount and duration of the rain-fall. If the soil is loose and porous, either naturally, or renderedso by cultivation, a larger amount of water will penetrate it. Theslope of the land determines the rate at which the water runs oft;the shorter the time of contact between soil and water, other^ Warington, Phjsical Properties of the SoiL THE SOIL AND WATER 143 things being equal, the smaller will be the amount of waterabsorbed by the soil. The greater the quantity of water pre-cipitated in a given period of time, the larger the proportion of itwill run olif as surface water. The more rapidly the water runsoff, the more soil it carries along with it, and the more likely it isto do damage by washing. —The rate at which water passes through the soildepends upon the character of the soil and the treatment to whichit has been subjected. Sands allow water to percolate VIEW. 3 Drain Gauges—Each 7 feet 3-12 in. x 6 feet = ^th acre area: Respectively 20, 40, and 60 inches depth of soil,collectors, each holding Drainage = 0500 graduated to .. •• 0-002 in. Overflow tank to hold Drainaee - = 2 • 000 ins. Fig- 35-—Drain gauges, Rothamsted, England. arid since they usually have a low capillary power, they oftensuffer from drought. Some clays allow water to pass throughso slowly that they remain wet and heavy, do not warm upquickly, and are often hard to work. The amount of waterwhich percolates may be decreased by increasing the water cap-acity of the soil or subsoil. Drain Gauges.—Drain gauges are used to study the gains and 144 OF , CHEMISTRY 7^?J j6-4-l -6-0 -^—^j^Tfij-
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