Soils and fertilizers . ature fits them particularly well fortrucking, and it is to that industry that a large area ofmarine soil is devoted. 25. Distribution of marine soils. — A fringe of land aver-aging many miles in width along the Atlantic coast fromLong Island southward and including all of Florida is com-posed of marine soil. This fringe then turns westwardand extends along the Gulf coast in a wide band as far westas the Rio Grande. The alluvial plain of the Mississippiriver cuts through the belt, but at this point the marinesoil extends as far north as Tennessee. In the aggregatethe ma
Soils and fertilizers . ature fits them particularly well fortrucking, and it is to that industry that a large area ofmarine soil is devoted. 25. Distribution of marine soils. — A fringe of land aver-aging many miles in width along the Atlantic coast fromLong Island southward and including all of Florida is com-posed of marine soil. This fringe then turns westwardand extends along the Gulf coast in a wide band as far westas the Rio Grande. The alluvial plain of the Mississippiriver cuts through the belt, but at this point the marinesoil extends as far north as Tennessee. In the aggregatethe marine soils constitute a large area of importantagricultural land producing cotton, corn and other farmcrops, as well as truck crops for which they are especiallyadapted. The following is a statement of the analysis of a typicalmarine soil from the coastal plain in Maryland: Table 5. — Percentage Composition of a Typical Marine Soil Phosphoric acid . . Magnesia Potash Iron lime 0,41 Silica Plate V. Soil Formation. — The upper figure shows a glacial tillsoil, the lower an alluvial soil. SOIL FORMATIONS 25 A striking peculiarity of this soil is the high percentageof silica, due to the fact that quartz is highly resistantto the constant working to which the particles have beensubjected and which has removed much of the phosphoricacid, potash, lime and magnesia. Soils of this particulartype contain little fertiUty, but respond well to fertiUzation. 26. Lacustrine soils. — These soils have been formedin the beds of lakes both ancient and comparatively older ones were formed in the glacial lakes, and bothare soils that have been worked over by water. Theyconstitute good agricultural soils and are found from NewEngland westward along the Great Lakes, and spread outin a wide area in the Red River valley. 27. Glacial soils. — The tremendous grinding to whichrocks have been subjected by glacial action has resulted ina large proportion of ver
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