. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. I i! -' =' i /// L' 'A C '=^' L" _ - w -. .SMALL. prRT^. , ' If/ '-5? Of Hi r .1, ' " / III (// I/' 11/ '/ - ^ w '^ I. - 'Ji Ui. Fig 49 —A small open ditch properly located This serves as a makeshift outlet for the tile system until the bed of the stream is lowered by a dredge (Wisconsin Station ) A small open ditch about four feet deep and seven feet wide at the top is sometimes dug through a low marsh kept wet by a slug- gish stream, to serve as a temporary outlet for a
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. I i! -' =' i /// L' 'A C '=^' L" _ - w -. .SMALL. prRT^. , ' If/ '-5? Of Hi r .1, ' " / III (// I/' 11/ '/ - ^ w '^ I. - 'Ji Ui. Fig 49 —A small open ditch properly located This serves as a makeshift outlet for the tile system until the bed of the stream is lowered by a dredge (Wisconsin Station ) A small open ditch about four feet deep and seven feet wide at the top is sometimes dug through a low marsh kept wet by a slug- gish stream, to serve as a temporary outlet for a system of tile or underdrainage, uaitil the stream is lowered and straightened by a dredge (Fig. 49). Open ditches of considerable width and depth are employed in large marshes where much water is to be removed and where the fall is slight. Such ditches are of primary importance because they form the outlets. They are dug by means of dredges. In many marshes having winding and sluggish streams these ditches are made by straightening and deepening the water-courses. On extensive marshes large open ditches, or canals, are con- structed every mile or half-mile, with large tile at regular intervals in between 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 Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
