Abstract
Recently, degradations of water quality have been progressed at the livestock agriculture and farming areas. There fore, investigations of current status are required grasping is important. And it has been pointed out that the pollutant load increases greatly and grasp of snowmelt period is demanded. In this paper, characteristics of nutrients discharge during snowfall and snowmelt period ware investigated in grassland, Aomori prefecture. As a result, it has been shown that the load of SS, TP and DTP exceed 90 percent in snowmelt. In addition, it has been shown that SS, TP and DTP were discharged during the daytime and DTN was discharged during the nighttime.
