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

This study aimed to identify the changing trends in the agricultural water quality of the major watersheds in Gyeongnam 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 3.0 mg L^-1, with the median values being 2.7 mg L^-1. The mean and median values of the electrical conductivity were 0.19 dS m^-1 and 0.18 dS m^-1, respectively. The mean T-N(Total Nitrogen) content was 2.43 mg L^-1, with the median values being 2.00 mg L^-1 and the mean and median values of the T-P (Total Phosphorous) were 0.07 mg L^-1 and 0.04 mg L^-1, respectively. T-N and T-P concentrations were slightly different yearly and monthly, but there was no tendency to increase or decrease.

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