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| Sneva, F.A.; Britton, C.M.; Mayland, H.F.; Buckhouse, J.; Evans, R.A.; Young, J.A.; Vavra, M.. |
| Field and laboratory studies were conducted on volcanic ash from Yakima, Moses Lake, Spokane, Washington, and Moscow, Idaho, three weeks after the May 18, 1980, eruption of Mt. St. Helens in southwestern Washington. These studies examined 1) the chemical, physical, and water retentivity properties of the ash, 2) the effect of the ash upon germination and emergence of crested wheatgrass and cheatgrass, 3) the impact of ash upon in vitro digestion of common forages fed to cattle and the rate-of-passage of ash in steers, and 4) the influence of the ash layer on water infiltration into a range soil and the amount of sediments in the runoff water. In addition to the above short term studies, small field plots of various ash treatments were initiated... |
| Tipo: Technical Bulletin |
Palavras-chave: Mass Import - unclassified. |
| Ano: 1982 |
URL: http://eprints.nwisrl.ars.usda.gov/1128/1/615.pdf |
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| Sneva, Forrest A.; Mayland, H.F.; Vavra, M.. |
| Ingested soil by the grazing animal not only contributes to the wear of the animal's teeth, but may also be a source of dietary minerals. Thus, an estimate of soil intake is a necessary factor in the determination of the amount of minerals entering the animal via the soil. Titanium (Ti), a rare earth element, is relatively abundant in soils, but is found only in small quantities (1 part per million) in plants not contaminated with soil (Healy, 1968). Thus, its presence in the feces of grazing animals is a reflection of: (1) eating soil-contaminated forage; (2) ingesting soil directly; (3) drinking soil-contaminated water. Mayland et al. (1975) investigated the Ti method in Idaho and found it useful for estimating soil ingestion by cattle grazing... |
| Tipo: Technical Bulletin |
Palavras-chave: Grass forage; Mass Import - autoclassified (may be erroneous). |
| Ano: 1983 |
URL: http://eprints.nwisrl.ars.usda.gov/1122/1/663.pdf |
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