History of Iowa agriculture in the context of nitrogen pollution

The Boone River Report can be found here.

Nitrate Concentration of the Monona-Harrison Ditch Watershed in 2017.

Nitrate concentration of the East Nishnabotna River in 2017.

Nitrate concentrations of the Nishnabotna River in 2017.

Nitrate concentrations of the Maquoketa River in 2017.

Nitrate concentrations of the Wapsipinicon River in 2017.

Nitrate concentrations of the Little Sioux River in 2017.

I have 44 years of rock solid Raccoon River nitrate data measured at Fleur Drive in Des Moines, courtesy of Des Moines Water Works. In looking at historical water quality data, it is interesting and fun to divide your record into pieces. 44/2 = 22, so let’s do that.

Nitrate concentrations on the Skunk River at Augusta in 2017.