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<br />q :'1)4)-'''''3 <br />IJ .,':. _ t ~' <br /> <br />Concentrations of nitrogen and phosphorus gen- <br />erally were greater at sites 5 and 6 than at sites 1-4. The <br />increases in nutrients downstream from site 4 probably <br />were related to nutrient transport in intermittent runoff <br />from agricultural land. Changes in nutrient concentra- <br />tions also could result from the decomposition of <br />organic matter in the river. Five samples containing <br />concentrations of ammonia greater than 0.05 mgIL also <br />contained concentrations of organic nitrogen that <br />fanged from 0.54 to 1.0 mglL. The samples were <br /> <br />collected during the spring of 1987 and may have <br />contained organic matter in various stages of decom- <br />position. The combined concentrations of dissolved <br />nitrogen (ammonia and nitrite plus nitrate) at site 6 <br />and concentrations of dissolved phosphorus at all <br />sites often exceeded the concentration levels of <br />0.3 mgIL as nitrogen and 0.01 mgIL as phosphorus <br />that are considered sufficient to produce nuisance <br />algae growths (Sawyer, 1947). <br /> <br />WATER-QUALITY CHARACTERISTICS AND LOADS 53 <br /> <br />,1- -~ <br />