File:Soils and fertilizers (1919) (14577332069).jpg

Identifier: soilsfertilizers00lyon (find matches)
Title: Soils and fertilizers
Year: 1919 (1910s)
Authors: Lyon, Thomas Lyttleton, 1869- (from old catalog)
Subjects: Soils Fertilizers
Publisher: New York, The Macmillan company
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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6. Why are marine soils characteristically sandy ? For whatagricultural industry are they frequently used ? 7. Are marine soils usually rich or poor in plant-food materials ?Why? 8. State over what areas in the United States lacustrine soilsare found. 9. Why do glacial soils resemble chemically the rocks from whichthey were formed ? What is a characteristic difference betweenresidual soil and glacial soil when both are formed from rocks richin plant-food materials? 10. Describe the mode of formation of the two principal kindsof seolian soils in the United States. Are they characteristicallyrich or poor in plant-food materials, and in what one particularly ? 11. Using any map of the United States as a base (preferably acolorless map showing the state boundaries and river courses), drawlines tracing roughly the regions occupied by residual, alluvial, marine,glacial, and seolian soils. These areas may then be shaded or coloreddifferently and a soil map of the United States thus be made.
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Plate VI. Stratification. — The upper figure illustrates stratifica-tion of rock, the lower stratification of soil. This shale rock has at onetime been soil. The soil may sometime be rock. SOIL FORMATION 29 LABORATORY EXERCISES Exercise I. — Classification of soils. A study of the various kinds of soils must nec-essarily be made in the field. No one localityaffords examples of all the different kinds of soillisted in Chapter III. In some places only one ortwo classes may be available. In any case makeall possible use of the materials, studying eachsoil as to origin, parent rock, color, depth, sub-soil, organic matter, drainage, general fertilityand crop adaptability. Exercise II. — Use of the soil auger in takingsoil samples. Material. — Soil auger and jars or bags forsamples. Procedure. — Explain the construction of a soilauger and then proceed with the taking of a sam-ple of the first eight inches of soil, removing thesoil in two portions. Then clean out a holelarger than

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