. Soils, their properties and management. Soils. Fig-. 72 —Types of packers and pulverizers : (l), solid or barrel roller; (2), corrugated roller; (3), crusher and subsurface packer; (4), bar roller. 585. Clod crushers. — The aim of these clod crushers is to break up lumps. As to mode of action, there are several forms. The corrugated and the bar roller and the clod crusher concentrate their weight at a few points, and are open enough so that the fine earth is forced up between the bearing surfaces. They are very effective in reducing lumpy soil to comparatively fine tilth. They have very litt
. Soils, their properties and management. Soils. Fig-. 72 —Types of packers and pulverizers : (l), solid or barrel roller; (2), corrugated roller; (3), crusher and subsurface packer; (4), bar roller. 585. Clod crushers. — The aim of these clod crushers is to break up lumps. As to mode of action, there are several forms. The corrugated and the bar roller and the clod crusher concentrate their weight at a few points, and are open enough so that the fine earth is forced up between the bearing surfaces. They are very effective in reducing lumpy soil to comparatively fine tilth. They have very little leveling effect further than the breaking- down of lumps. The planker, drag, or float, variously so-called, con- sists essentially of a broad, heavy weight without teeth, which is dragged over the soil. The lumps are rolled under its edge and ground together in a manner which very effectively reduces their size. At the same time the soil is leveled, smoothed, and, to a degree, compacted. This implement may well be used in the place of the roller. 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 Lyon, T. L. (Thomas Lyttleton), 1869-1938; Fippin, Elmer O. (Elmer Otterbein), 1879-1949; Buckman, Harry Oliver, 1883-. New York, Macmillan
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Keywords: ., bookauthorlyontlth, bookcentury1900, bookdecade1910, bookyear1915
