RT Journal Article SR Electronic T1 Bulk density summaries for midwestern soils JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 203 OP 205 VO 39 IS 3 A1 M. J. Mausbach A1 E. E. Gamble YR 1984 UL http://www.jswconline.org/content/39/3/203.abstract AB Data on moist bulk density were summarized for more than 2,800 soil horizons of midwestern soils to provide a base for estimating a reasonable value for specific horizons. Histograms of the median bulk density and range between the second and third quartile values are presented for specific clay classes for different parent materials and horizon groups. Median bulk density generally decreases with increasing clay content and increases with increasing sand content. The A horizons generally have lower bulk density values than B2 or Bt horizons. Half of the bulk density values for classes of loamy soils are within a range of 0.2 to 0.3 g/cm3; half of the values for silty soils are within a range of 0.1 to 0.2 g/cm3. Classes of loess soils have the least variability in bulk density. These trends in median bulk density values indicate that stratifying the data by parent material, texture, and pedogenic processes is of value in making estimates of bulk density.