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Friday, May 15, 2020 | History

2 edition of Water-repellent soils found in the catalog.

Water-repellent soils

Symposium on Water-Repellent Soils (1968 University of California, Riverside)

Water-repellent soils

proceedings

by Symposium on Water-Repellent Soils (1968 University of California, Riverside)

  • 354 Want to read
  • 37 Currently reading

Published by University of California in Riverside, Calif .
Written in English

    Subjects:
  • Soil moisture -- Congresses.,
  • Soil absorption and adsorption -- Congresses.

  • Edition Notes

    Statementcoedited by Leonard F. Debano, John Letey.
    GenreCongresses.
    ContributionsDeBano, Leonard F., Letey, John, 1933-, University of California, Riverside. Dry Lands Research Institute., National Science Foundation (U.S.)
    The Physical Object
    Paginationviii, 354 p. :
    Number of Pages354
    ID Numbers
    Open LibraryOL16510801M

    Bond, R.D., , Water repellent sands, in 9th International Congress of Society of Soil Science, Adelaide, Australia, , Transactions, v.1, p. This paper presents some preliminary research into the phenomenon of water-repellent soils in Australia. Research was directed toward the evaluation of sandy, water-repellent pasturesFile Size: KB. Waterproof and Water Repellent Textiles and Clothing provides systematic coverage of the key types of finishes and high performance materials, from conventional wax and silicone, through controversial, but widely used fluoropolymers and advanced techniques, such as atmospheric plasma deposition and sol-gel technology. The book is an essential resource for all those engaged in garment.

    Results from comparison experiments with freeze-dried soil samples implied that the WR peak at lower soil water contents was caused mainly by temperature effects, while the peak at higher soil water contents was related to water content only. In water repellent soil the smaller soil size fractions exhibited the highest degree of water repellency. Water-repellent soils created by surface application of hydrophobic organics have great potential for water harvesting. Theoretically, runoff yields should be high (approaching % of precipitation) and costs should be low, since a water-repellent soil surface should be obtainable with only a monolayer coating of the organic by: 5.

    An advantage of the method is that the soil is not disturbed by the sampling. For assessment of the persistence of water repellency in strongly to extremely water repellent soils, and for determination of the critical soil water contents, the WDPT test and volumetric water content determinations should preferably be performed in the laboratory. Adding Organic Matter to Soil The worst problem facing gardeners in Australia today is that when soils dry out, they can become water repellent, or hydrophobic. When this happens, water just runs off instead of soaking into the soil.


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Water-repellent soils by Symposium on Water-Repellent Soils (1968 University of California, Riverside) Download PDF EPUB FB2

The book starts with a historical overview of water repellency research, followed by seven thematic sections covering 26 research chapters. The first section discusses the origin, the second the assessment, and the third the occurrence and hydrological implications of soil water : Hardcover.

Water repellency has been reported in most continents of the world for varying land uses and climatic conditions. Soil water repellency often leads to severe runoff and erosion, rapid leaching of surface-applied agrichemicals, and losses of water and nutrient availability for crops.

The book starts with a historical overview of water repellency research, followed by 7 thematic sections covering the origin, assessment and occurrence and hydrological implications of soil water repellency, the effect of fire on water repellency, the physics and modeling of flow and transport in water repellent soils, Water-repellent soils book techniques and farming strategies to combat soil water repellency.

The fourth section is devoted to the effect of fire on water repellency, section five deals with the physics and modeling of flow and transport in water repellent soils, section six presents amelioration techniques and farming strategies to combat soil water repellency, and section seven concludes the book with an extensive bibliography on soil Book Edition: 1.

The occurrence of water-repellent soils is rare and usually their repellency is temporary (dry soils). This chapter defines the characteristics of soil-water repellency: contact angle, severity of water repellency, persistence of soil water repellency and index of water : Viliam Novák, Hana Hlaváčiková.

Soils are classified as wettable with contact angles φ ; water-repellent soils are characterized by contact angles of φ ≥ 90°. Water repellent soils exhibit hydrophobic properties when dry, resisting or retarding water infiltration into the soil matrix (Brandt, a).

Infiltration rates may be reduced by an order of magnitude, even in soils which visually appear to wet “normally” (Wallis et al., ).Cited by: water repellent soils, kinds of water repellent substances, effects of soil-water repellency on water movement, fire-induced soil-water repellency, man-agement problems and implications of water repellency, and future research needs.

NATURE AND FORMATION OF WATER REPELLENT SOILS Normally, dry soils readily imbibe water. A strongCited by: Soil Water Repellency Dr Rachel Poulter. Department of Primary Industries and Fisheries, Redlands Research Station, Cleveland, Q’ld.

What is it. A water-repellent soil (or hydrophobic soil) does not wet up spontaneously when a drop of water is placed upon. water repellent soils is >90º (Fig. Typically in soil physics, it was assumed that θ was 0 and did not need to be considered when estimating transport and capillarity.

It also addresses topics such as stony soil, water repellent soils, and water movement modeling in those media. The book presents soil hydrology in a simple way, while quantitatively expressing the soil water state and movement. It clearly and precisely describes basic terms of soil hydrology with a minimum of mathematics.

Water repellency (hydrophobicity) of soils is a property with major repercussions for plant growth, surface and subsurface hydrology, and for soil erosion.

Important advances have been made since the late s in identifying the range of environments affected by water repellency, its characteristics and its hydro-geomorphological by: Encyclopedia of Soil Science book. Encyclopedia of Soil Science. DOI link for Encyclopedia of Soil Science.

Encyclopedia of Soil Science book. By Rattan Lal. Edition 3rd Edition. First Published eBook Published 11 January Pub. location Boca Raton. Water-Repellent Soils Cited by: 2. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

The fourth section is devoted to the effect of fire on water repellency, section five deals with the physics and modeling of flow and transport in water repellent soils, section six presents amelioration techniques and farming strategies to combat soil water repellency, and section seven concludes the book with an extensive bibliography on soil.

Soil water repellency (WR) is a globally recognized phenomenon, significantly affecting seed germination, plant growth, surface runoff and erosion, preferential flow path development, and non‐target movement of fertilizers and pesticides into surface and groundwater resources (Larsbo et al., ; DeBano, ; Doerr et al., ).Although severe WR is often observed regionally, soils.

Water-repellent soils have a potential as alternative construction materials that will improve conventional geotechnical structures. In this study, the potential of chemically treated water-repellent kaolin clay as a landfill cover material is explored by examining its characteristics including hydraulic and mechanical properties.

In order to provide water repellency to the kaolin clay, the Cited by: 6. Water repellent soils are common throughout the world.

Water repellency significantly affects infiltration, evaporation, and other water‐soil interactions. Various indices, such as the water‐solid contact angle (θ), water drop penetration time (WDPT), and 90° surface tension (γ ND), have been proposed to characterize the degree of water.

Infiltration and water repellency in granitic soils. Ogden, Utah: Intermountain Forest & Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, (OCoLC) Soils on 53 burned sites in the upper peninsula of Michigan were examined for fire-induced water repellency. The development of water repellency was found to be fire related with over 40% of the burned soils showing at least some water-repellent by:.

Waterproof and Water Repellent Textiles and Clothing provides systematic coverage of the key types of finishes and high performance materials, from conventional wax and silicone, through controversial, but widely used fluoropolymers and advanced techniques, such as atmospheric plasma deposition and sol-gel technology.

The book is an essential resource for all those engaged in garment. Whether it’s sandy, coastal soils or older potting mixes, many of our growing mediums can become hydrophobic, or water repellent, over time. Josh is finding that one of his indoor plants, a.Turfgrass stress, water-repellent soils and LDS The need to maintain low mowing heights and fast green speeds increases the occurrence of localized dry spots caused by water-repellent soil.

Keith J. Karnok, Ph.D., and Kevin A. TuckerFile Size: KB.