Soil dispersibility
1983
Đông A, | CHESTERS, G. | Simsiman, G. V.
We took samples of six surface soils, two subsurface soils, and one organic soil from the Menomonee River Watershed, Wisconsin, and dispersed them by (1) shaking with water to simulate natural water erosion and particle transport conditions, and (2) ultrasound to provide complete dispersion. The shaking treatment consists of end-over-end agitation of a 1:10 wt:vol soil:water mixture for 0.5 to 128 hours, and the ultrasound treatment was for a 15-minute period. The ratio of the amount of clay-sized particles dislodged by shaking to the amount of clay-sized particles obtained by ultrasound treatment was used to measure ease of dispersibility of soils. Samples with clay-sized particles that disperse readily under the shaking treatment have a higher dispersibility ratio than samples with clay-sized particles that remain intact as aggregates. If a 4-hour shaking treatment simulates the onset of soil erosion conditions in the field, as much as 90 percent of the primary clay-sized particles remain intact as silt-sized or larger aggregates. The clay dispersibility ratio was significantly correlated with organic carbon content in an inverse relationship. We also investigated the logarithmic and linear relationships.
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