TY - JOUR T1 - USLE P factors for subsurface drainage on low slopes in a hot, humid climate JF - Journal of Soil and Water Conservation SP - 480 LP - 482 VL - 45 IS - 4 AU - R. L. Bengtson AU - G. Sabbagh Y1 - 1990/07/01 UR - http://www.jswconline.org/content/45/4/480.abstract N2 - Sediment losses were measured from a subsurface drainage-runoff-erosion experimental area near Baton Rouge, Louisiana, for the years 1981–1987. Subsurface drainage reduced soil loss 42%. An annual universal soil loss equation soil loss ratio of 0.11 for conventional tillage silage corn and an annual P value of 0.60 for subsurface drainage were calculated from the soil erosion data for this experiment. The experiment also showed that subsurface drainage is more effective in reducing soil erosion during the winter by controlling water tables caused by the cool weather and large amounts of precipitation during this season in Louisiana. ER -