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ABSTRACT
Soil crusts were studied by preparing and examining thin sections taken normal to the soil surface. Several photomicrographs of the thin sections are presented which illustrate differences encountered among different soils and among different management practices of the same soil. Some crusts exhibited orientation of particles within the crust while others showed some orientation of the bulk soil mass in certain parts of the crust. A pronounced gradation of texture was evident in certain crusts. This work illustrates the visual evidence obtainable from the use of thin sections in soil crust studies.
1 Technical Paper 1091, Arizona Agr. Exp. Sta., Tucson. Contribution from The Department of Agricultural Chemistry and Soils. The work was done under Regional Research Project W-66.
2 Professor and Associate Professor, respectively, University of Arizona. Second author now Associate Professor at North Carolina State University, Raleigh.
Received for publication February 2, 1967. Accepted for publication September 7, 1967.
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