Southwick L M, Willis G H, Mercado O A, Bengtson R L
U.S. Department of Agriculture, ARS, Soil and Water Research Unit, 4115 Gourrier Avenue, Baton Rouge, Louisiana 70808-4499, USA.
Arch Environ Contam Toxicol. 1997 Jan;32(1):106-9. doi: 10.1007/s002449900161.
Subsurface drains reduced runoff losses of metolachlor and trifluralin from plots on Mississippi River alluvial soil planted with soybean. The drains reduced metolachlor runoff losses by 90% and trifluralin losses by 57%. Concomitantly, runoff volume was reduced 24% and soil erosional losses by 75%. The large reduction of metolachlor losses in runoff was due to a first event from the nondrained plot that was characterized by high chemical concentration, a characteristic that was not duplicated in the corresponding events from the drained plots. Due to low sediment concentrations in runoff and to low water solubility,trifluralin loss in runoff, even from the nondrained treatment, was less than 0.2% of the application.
地下排水系统减少了密西西比河冲积土上种植大豆地块中异丙甲草胺和氟乐灵的径流损失。这些排水系统使异丙甲草胺的径流损失减少了90%，氟乐灵的损失减少了57%。与此同时，径流量减少了24%，土壤侵蚀损失减少了75%。径流中异丙甲草胺损失的大幅减少是由于未排水地块的首次事件，其特点是化学物质浓度高，而排水地块相应事件中没有出现这种情况。由于径流中的沉积物浓度低且水溶性低，即使是未排水处理地块，径流中氟乐灵的损失也不到施用量的0.2%。
