Contribution of Humic Acid and a Polysaccharide to Water Repellency in Sand and Soil
- 1 January 1969
- journal article
- Published by Wiley in Soil Science Society of America Journal
- Vol. 33 (1) , 149-151
- https://doi.org/10.2136/sssaj1969.03615995003300010039x
Abstract
A silica sand and Pachappa sandy loam were treated at various pH's with aqueous suspensions of three microbial humic acids, a soil and peat humic acid, a microbial polysaccharide, and metallic salts of the tested organic substances. Of all the substances tested, only one, a humic acid isolated from a Stachybotrys atra culture, caused water repellency in the sand and soil. The Fe3+ and Al3+ salts of this humic acid rendered the sand and soil practically impermeable to water. The organic matter content of the extremely water repellent sands was less than .05%. The final conclusion of the paper is that humic acid‐like substances and polysaccharides probably do not contribute much to water repellency in soils.Keywords
Funding Information
- U.S. Forest Service
- U.S. Department of Agriculture (4000)
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