Lm. Southwick et al., EFFECT OF SUBSURFACE DRAINS ON RUNOFF LOSSES OF METOLACHLOR AND TRIFLURALIN FROM MISSISSIPPI RIVER ALLUVIAL SOIL, Archives of environmental contamination and toxicology, 32(1), 1997, pp. 106-109
Subsurface drains reduced runoff losses of metolachlor and trifluralin
from plots on Mississippi River alluvial soil planted with soybean. T
he drains reduced metolachlor runoff losses by 90% and trifluralin los
ses by 57%. Concomitantly, runoff volume was reduced 24% and soil eros
ional losses by 75%. The large reduction of metolachlor losses in runo
ff was due to a first event from the nondrained plot that was characte
rized by high chemical concentration, a characteristic that was not du
plicated in the corresponding events from the drained plots. Due to lo
w sediment concentrations in runoff and to low water solubility, trifl
uralin loss in runoff, even from the nondrained treatment, was less th
an 0.2% of the application.