This is a poster to display in the Exibition of Science English in Hokkaido.
The summary of this poster is as follows.
We measured the phosphate ion concentration and nitrate nitrogen concentration to examine a relationship between rainfall and the river’s water quality. Also, we calculated their inlet flow. The phosphate ion attaches itself to the soil strongly, but nitrate nitrogen attaches itself weakly. We understood that this difference affects the river’s water quality.