Effect of N-fertilizer application on return flow water quality from a terraced paddy field in Northern Taiwan

摘要: Intensive use of chemical fertilizer for crops may be responsible nitrogen and phosphate accumulation in both groundwater surface waters. The return flow polluted by nutrients not only results the limitation water reuse goals but also creates many environmental problems, including algal blooms eutrophication neighboring bodies, posing potential hazards to human health. This study is evaluate N-fertilizer application terraced paddy fields impacting quality. Water quality monitoring continued two crop-periods around subject different irrigation water, drainage at outlet experimental field, shallow were conducted an field located Hsin-chu County, Northern Taiwan. analyzed indicate that obviously increasing ammonium-N (NH4 +-N) nitrate-N (NO3 −-N) concentrations ground just occurred during stage basal application, then reduced relatively low (<0.1 mg/l <3 mg/l, respectively) remaining period cultivation. demonstrate pollution load can proper control practices.