Distribution and Variability of Surface Soil Properties at a Regional Scale
John J. Brejdaa,
Thomas B. Moormanb,
Jeffrey L. Smithc,
Douglas L. Karlenb,
Deborah L. Alland and
Thanh H. Daoe
a USDA-ARS Wheat, Sorghum, and Forage Research Unit, 344 Keim Hall, Univ. Nebraska, Lincoln, NE 68583 USA
b USDA-ARS, National Soil Tilth Lab, 2150 Pammel Dr., Ames, IA 50011 USA
c USDA-ARS, 215 Johnson Hall, Washington State Univ., Pullman, WA 99164-6421 USA
d Dep. Soil, Water, and Climate, Univ. of Minnesota, 1991 Buford Circle, St. Paul, MN 55108 USA
e USDA-ARS, Bushland, TX 79012 USA

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Fig. 1 Geographic distribution of Major Land Resource Areas 9 (Palouse and Nez Perce Prairies), 105 (Northern Mississippi Valley Loess Hills), 67 (Central High Plains), and 77 (Southern High Plains)
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Fig. 2 Frequency distribution of total organic C concentrations in MLRA 105: (a) nontransformed data; (b) loge transformed data
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Copyright © 2000 by the Soil Science Society of America.