PT  - JOURNAL ARTICLE
AU  - E. B. Alexander
TI  - Volume estimates of coarse fragments in soils: A combination of visual and weighing procedures
DP  - 1982 Jan 01
TA  - Journal of Soil and Water Conservation
PG  - 62--63
VI  - 37
IP  - 1
4099  - http://www.jswconline.org/content/37/1/62.short
4100  - http://www.jswconline.org/content/37/1/62.full
AB  - 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.