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<br />-- <br /> <br />Session VI - Natmal C~.u!les of Water Repellency in Soil,: <br />*Bond, R.D. Factors responsible for water repellence of soil~ <br />*DeBano, L.F. The relationship between heat treatment and water repellency in <br />soils. <br />*Holzhey, C.S. Soil morphologkal relationships and water repellence. <br />Adams, Susan, Sttain, B.R., and Adams, M.S. Water-repellen: soils and annual plant <br />cover in a desert scmb comrnur~ty of southeastern Califoro.ia <br /> <br />Session VII - The Effect of Soil Water Repellency and Wetting Agents on <br />Plant Growth: <br />Osborn, J.F. The effect of wetting agents and water repellency on the germination <br />and establishment of gras~;. <br />Parr,].F. Effects of surfactmts on plant growth and conside cations in their use. <br />Endo, R.M. The deleteriom effects of two nonionic surfacta lts on the germination <br />and growth of various grasses. <br />Shaw, E. Molecular physics and related properties of water ill connection with <br />phenomena of wetti::lg. <br />Waddington, D.V. Observations of water repellency on turffrass areas. <br /> <br />DeBano, L.F., Mann, L.D., and Hamilton, D.A., 1970, Translocation of hydrophobic <br />substances into soil by burning organic litter: Soil Scien:e Society of America <br />Proceedings, v. 34, p. 130-133. <br />Researchers investigated the relalionships between soil texture, sur 'ace material, and heat- <br />induced water repellency. Four different soil types were evaluated in burning experiments <br />with two different surface materials (sugarbush plant litter, and a water-repeu,ent soil). The <br />soils that were tested included a pure sand, and three samples with v uying amounts of sand, <br />silt (12-42%) and clay (1-130/0. Researchers observed that hydrophobic substances <br />translated down into the so~. during burning and formed water-repeU ent layers. The thickest <br />and most intense layers occurred under conditions of burned litter a~ plant top material, and <br />with pure sand as the underlying soil. The results are attributed to he fact that the coarse- <br />textured soils had a smaller surface area to volume ratio. The auth, )rs also noted a general <br />increase in water repellency with an increase in translated organic matter, but no direct <br />relationship was found. <br /> <br />DeBano, L.F., and Rice, R.M., 1973, Water-repellent soils- theiJ implication in <br />forestry: Journal of Fort,stry, v. 71, p. 220-223. <br />This paper offers an extensive semmary of information on wat~r-repellent soils (both <br />biologically and fire-induced), and provides a good base of info:mation on the causes, <br />effects, characteristics, and r.he interdependence of various factors. Although more current <br />research has since added to the findings presented in this paper, it is still a comprehensive <br />account of previous research on the topic. The authors do, howe /er, neglect to mention <br />some alternative hypotheses regarding the mechanism of formation :e.g. Savage, et al., 1969 <br />and 1972). <br /> <br />12 <br />