Effect of subsurface drains on runoff losses of metolachlor and trifluralin from Mississippi River alluvial soil

• Published in: Archives of environmental contamination and toxicology Vol. 32; no. 1; pp. 106 - 109
• Main Authors: Southwick, L.M. (USDA, ARS, Soil and Water Research Unit, Baton Rouge, LA.), Willis, G.H, Mercado, O.A, Bengtson, R.L
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer-Verlag 01.01.1997; Berlin; New York, NY
• Subjects: Acetamides - analysis; Acetamides - metabolism; Agronomy. Soil science and plant productions; Applied sciences; Biological and medical sciences; Exact sciences and technology; Fresh Water - analysis; Fundamental and applied biological sciences. Psychology; Herbicides - metabolism; Kinetics; LOSSES FROM SOIL; METOLACHLOR; METOLACHLORE; METOLACLORO; Mississippi; Natural water pollution; Pollution; Rainwaters, run off water and others; SOIL; Soil and water pollution; Soil erosion, conservation, land management and development; Soil Pollutants - analysis; Soil Pollutants - metabolism; Soil science; SOL; SUELO; TRIFLURALIN; Trifluralin - analysis; Trifluralin - metabolism; TRIFLURALINA; TRIFLURALINE; Water treatment and pollution; Louisiana; United States; North America; America; Mississippi; Nitro compound; Agricultural chemical product; Soil erosion; Alluvial soil; Cultivated soil; Field experiment; Chemical pollution; Water erosion(soil); Dicotyledones; Angiospermae; Treatment efficiency; Loss; Runoff water; Glycine max; Soil management; Herbicide; Oil plant(vegetal); Drainage; Hydrology; Grain legume; Leguminosae; SUBSURFACE DRAINAGE; Runoff; Water pollution control; Surface water; Environment; Organic amide; Spermatophyta; Water pollution; Trifluralin
• ISSN: 0090-4341; 1432-0703
• 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.