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Research ArticleResearch Section

Comparing three geophysical tools for locating sand blows in alluvial soils of southeast Missouri

J. A. Doolittle, S. J. Indorante, D. K. Potter, S. G. Hefner and W. M. McCauley
Journal of Soil and Water Conservation May 2002, 57 (3) 175-182;
J. A. Doolittle
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S. J. Indorante
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D. K. Potter
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S. G. Hefner
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W. M. McCauley
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ABSTRACT:

The level, moderately fine and fine-textured, poorly and very poorly drained alluvial soils of the southern Mississippi River Valley are well suited to rice production. However, in many areas, small inclusions of more rapidly permeable, coarse-textured soils occur as sand blows. Because of their more rapid permeability, these included soils are considered marginal for rice production. In this study, an EM38 meter, a GEM300 sensor, and a Veris 3100 soil EC mapping system were compared and used to assess clay content and to locate sand blows in southeastern Missouri. All three tools produced similar gross spatial patterns of apparent conductivity that corresponded to mapped soil delineations and changes in clay content. However, spatial patterns of apparent conductivity are more intricate than major soil patterns and indicate soil map unit inclusions. Moderate correlations (r = 0.39 to 0.71) were found between apparent conductivity and average clay content of the o to 25 cm layer. Correlations improved (r = 0.63 to 0.90) as the clay content was averaged over the o to 75 cm and the o to 100 cm depth intervals. As spatial patterns reflect differences in clay content, these tools can be used to help locate small, included areas of coarse-textured soils that might otherwise be overlooked.

Footnotes

  • James A. Doolittle is a research soil scientist with the U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center in Newtown Square, Pennsylvania. Sam J. Indorante is a soil survey project leader with the USDA-NRCS in Carbondale, Illinois. Dennis K. Potter is a state soil scientist with the USDA-NRCS in Columbia, Missouri. Steve G. Hefner is a water quality project coordinator with the USDA-NRCS in Ozark. Missouri. W. Matt McCauley is a resource soil scientist with the USDA-NRCS in Benton, Illinois.

  • Copyright 2002 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 57 (3)
Journal of Soil and Water Conservation
Vol. 57, Issue 3
May/June 2002
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Comparing three geophysical tools for locating sand blows in alluvial soils of southeast Missouri
J. A. Doolittle, S. J. Indorante, D. K. Potter, S. G. Hefner, W. M. McCauley
Journal of Soil and Water Conservation May 2002, 57 (3) 175-182;

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Comparing three geophysical tools for locating sand blows in alluvial soils of southeast Missouri
J. A. Doolittle, S. J. Indorante, D. K. Potter, S. G. Hefner, W. M. McCauley
Journal of Soil and Water Conservation May 2002, 57 (3) 175-182;
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