. Dry-farming : a system of agriculture for countries under a low rainfall . Dry farming. 56 DRY-FARMING in this connection that climatic chfferences may and usually do influence materially the character of soils formed from one and the same kind of Characteristics of arid soils The net result of the soil-forming processes above described is a njck powder containing a great variety of sizes of soil grains intermingled with clay. The larger soil grains are called sand; the smaller, silt, and those that are so small that Fig. 17. Soil is a mixture of particles of tllCV do UOt Settle verv
. Dry-farming : a system of agriculture for countries under a low rainfall . Dry farming. 56 DRY-FARMING in this connection that climatic chfferences may and usually do influence materially the character of soils formed from one and the same kind of Characteristics of arid soils The net result of the soil-forming processes above described is a njck powder containing a great variety of sizes of soil grains intermingled with clay. The larger soil grains are called sand; the smaller, silt, and those that are so small that Fig. 17. Soil is a mixture of particles of tllCV do UOt Settle verv varj'iDg size. ^ ' . ^ ^ from cjuiet water after 24 hours are known as clay. Compare Fig. 17. Clay differs materially from sand and silt, not only in size of i3articles, but also in properties and forma- tion. It is said that clay ])articles reach a degree of fineness eciual to ^'ioo "f ^^i^ inch. Clay itself, when wet and kneaded, becomes plastic and adlie- sive and is thus easily distinguished from sand. Because of these projjerties, clay is of great value in holding together the larger soil grains in relatively large aggregates which give soils the desired degree of tilth. ^loreover, clay is very retentive of water, gases, and soluble plant-hiods, which are important. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Widtsoe, John Andreas, 1872-1952. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectdryfarming
