Important Soils of the United States Issued to Accompany a Span Classsearcht
Important Soils of the United States Issued to Accompany a Span Classsearcht
United States Bureau of Soils
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The soils occupy a rolling to rather hilly region. They are not well adapted by conditions of climate or irrigation to fruit culture, but they are friable, retentive of moisture, and usually productive, and with related series of soils differing only in color are the great wheat- growing soils of the Palouse region in eastern Washington and Ore- gon and northern Idaho. The Yakima soils are of light-brown to medium-brown color; the subsoils are usually friable, not heavier than the surface soil,... and underlain by a porous sand and gravel substratum. These soils occur as recent alluvial deposits in stream valleys. The parent material is derived largely from basaltic material, but material derived by erosion from adjacent lake sediments or from more remote areas of rocks of various kinds may be included. These soils are usually favorably situated with regard to protection from frosts and means of irrigation, and have been highly developed in the production of IMPORTANT SOILS OF THE UNITED STATES.
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