Korean Journal of Soil Science and Fertilizer ISSN:0367-6315(Print) 2288-2162(Online) 한국토양비료학회 학회지

This study aimed to identify the changing pattern in the agricultural water quality of the small watersheds in Gangwon province over a 10-year period ranging from 2007 to 2016. The results of water quality analysis of the study sites revealed that the mean chemical oxygen demand was 1.9 mg L^-1, with the median values being 1.7 mg L^-1, and there was no yearly fluctuation. The mean and median values of electrical conductivity (EC) were 0.17 dS m^-1 and 0.13 dS m^-1, respectively, and the values trended to increase from April to October. The mean and median values of the total nitrogen (T-N) content were 2.83 mg L^-1 and 2.50 mg L^-1, respectively. The mean and median values of the total phosphorous (T-P) content were 0.05 mg L^-1 and 0.02 mg L^-1, respectively. The T-N and T-P content were the highest in April during the survey period, 3.08 mg L^-1 and 0.06 mg L^-1, respectively.

Changes in annual water quality index in April, July and October in Gangwon province.