This study aimed to identify the changing trends in the agricultural water quality of the major watersheds in Chungnam Province over a 10-year period ranging from 2007 to 2016. The results of water quality analysis revealed that the mean chemical oxyg...
This study aimed to identify the changing trends in the agricultural water quality of the major watersheds in Chungnam Province over a 10-year period ranging from 2007 to 2016. The results of water quality analysis revealed that the mean chemical oxygen demand was 4.1 mg L<SUP>-1</SUP>, with the median values being 4.0 mg L<SUP>-1</SUP>. The result of annual CODMn of stream water showed tendency to increase. The mean and median values of EC(electrical conductivity) were 0.21 dS m<SUP>-1</SUP>and 0.19 dS m-1, respectively. The mean T-N (total nitrogen) was 2.91 mg L<SUP>-1</SUP>, with the median values being 2.47 mg L<SUP>-1</SUP>. The mean and median values of the T-P (total phosphorous) content were 0.11 mg L<SUP>-1</SUP> and 0.07 mg L<SUP>-1</SUP>, respectively.