This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...if allowed to accumulate in the surface portion of the soil. This it is likely to do if the water table rises much above its present level. Borings No. 629, 644, 517, and 66 are representative of the amount and vertical distribution of the salts for the unirrigated low-land part of this type of soil, where the depth to ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 Excerpt: ...if allowed to accumulate in the surface portion of the soil. This it is likely to do if the water table rises much above its present level. Borings No. 629, 644, 517, and 66 are representative of the amount and vertical distribution of the salts for the unirrigated low-land part of this type of soil, where the depth to standing water is 6 or more feet, which is usually the case. In these samples the aggregate amount of salt to the depth of 6 feet is considerable and will correspond to the area shown on the map by an appropriate color, where the salt content to a depth of 5 feet ranges from 0.6 to 1 per cent. A small portion of this type of soil, however, falls within another area on the map, where the salt content exceeds 1 percent, while, on the other hand, some of it falls in the blue area, with less than 0.6 of 1 per cent. The first foot usually carries a relatively small amount of salt and indicates that crops could be successfully grown. As we go deeper, however, the amount of salts increases very rapidly and the second foot is usually about the limit for alfalfa, while the third foot almost invariably contains too much to permit the growth of any agricultural crops. At 6 feet there is usually about 2 per cent of salt. This distribution of the salts probably occurs because the rains wash them downward more rapidly than they are returned toward the surface by evaporation. If irrigation water were applied, the salts would continue to move downward, provided the water table remained at its present depth. Unfortunately, however, the application of water invariably causes a rise of the water table, and if the application be continued over a considerable area the water table comes sufficiently near the surface to cause excessive surface evaporation, which re...
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Add this copy of Field Operations of the Division of Soils to cart. $48.02, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2011 by Nabu Press.
Add this copy of Field Operations of the Division of Soils, 1901. 2 to cart. $825.00, Sold by Weller Book Works, A.B.A.A. rated 4.0 out of 5 stars, ships from Salt Lake City, UT, UNITED STATES.
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8. New York, Michigan, New Jersey, Pennsylvania, Maryland, Virginia, North Carolina, Georgia, Tennessee, Mississippi, Washington, Idaho, California, Louisiana. U.S. Dept of Agriculture Third Report.
