NO3 on Oksrukuyik Creek near Toolik Field Station, Alaska 1989-2012

Samples from designated stations from the Oksrukuyik were collected during each summer from 1989 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Samples were analyzed for Nitrate since 1989 on the Oksrukuyik Creek.