Potential of Surface Water Contamination from Three Triazine Herbicides

摘要

The movement of atrazine, cyanazine, and simazine from the site of application was monitored under conventional, reduced and no-tillage conditions. Less water and soil were lost from the no-tillage and reduced tillage conditions. Conventional tillage conditions had about 66,000 L/ha runoff in 1986-87, and about 123,000 L/ha runoff in 1987-88. Seasonal rainfall was 885 mm in 1986-87, and 397 in 1987-88. The rainfall intensity was greater during the first two events in 1987 than the corresponding events in 1986. The first rainfall event in 1986 accounted for 91, 89, and 78 percent of the total seasonal loss of atrazine, cyanazine, and simazine, respectively. More simazine was found in the surface runoff water than was atrazine or cyanazine.