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Scientific Investigations Report 2009–5078

Assessment of Eutrophication in the Lower Yakima River Basin, Washington, 2004–07

Table 7. Total nitrogen and total phosphorus content of macrophyte tissues collected in the Zillah reaach (near river mile 87) and the Kiona reach (near river mile 21) of the Yakima River, Washington, August 30–September 2, 2005.

[Values are percentages based on dried weight and are the means for all samples. The range in values is shown in parentheses. Samples in the Zillah reach were collected September 2, 2005 and samples in the Kiona reach were collected August 30, 2005. Abbreviation: n, number of samples]

Parameter
(percent)
Zillah reach
(n=3)
Kiona Reach
(n=8)
Total nitrogen content 3.52 (3.41–3.64) 2.61 (2.44–3.12)
Total phosphorus content 0.45 (0.39–0.49) 0.42 (0.29–0.54)

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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