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Browsing Extension Service -- Miscellaneous / Educational Materials by Author "Selker, John S."

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Browsing Extension Service -- Miscellaneous / Educational Materials by Author "Selker, John S."

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  • Oregon State University. Extension Service; Feaga, Jeff; Selker, John S. (Corvallis, Or. : Extension Service, Oregon State University, 2004-01)
    According to the United States Geological Survey, 9 percent of wells in the Willamette Valley exceed the EPA’s 10 ppm drinking water standard for nitrogen in the NO3– compound, or NO3–-N. A study of 281 domestic drinkin ...
  • Oregon State University. Extension Service; Selker, John S. (Corvallis, Or. : Extension Service, Oregon State University, 2004-04)
    We first need to note that the soil nitrogen that makes plants green is primarily in the form of nitrate, and this nitrogen is accessible to plants specifically because it stays dissolved in the soil water. In a typical ...
  • Oregon State University. Extension Service; Sattell, Robert; Dick, Richard; Hemphill, Delbert D.; Selker, John S.; Brandi-Dohrn, Florian M.; Minchew, Hudson; Hess, Marlo; Sandeno, Joan; Kaufman, Susan M. (Corvallis, Or. : Extension Service, Oregon State University, 1999-10)
    Willamette Valley field trials have shown that properly managed cover crops can reduce the amount of nitrate (NO3-)

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