ABSTRACT:
Visual estimates of coarse fragment content, one of the most important parameters of upland soils, are most effective for cobbles and boulders. Sieving and weighing is a much more accurate means of estimating finer gravels (pebbles less than 20 millimeters). Conversions from weight to volume percentages are simplified by an equation requiring only the ratio of soil bulk density to coarse fragment density, rather than each separately.
Footnotes
E. B. Alexander is a soil scientist with the watershed management staff, Forest Service U.S. Department of Agriculture. San Francisco, California 94111.
- Copyright 1982 by the Soil and Water Conservation Society
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