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Fluometuron Sorption and Degradation in Cores of Silt Loam Soil from Different Tillage and Cover Crop Systems

^a Dep. of Agronomy, LSU AgCenter, Baton Rouge, LA 70803
^b Northeast Research Station, LSU AgCenter, Winnsboro, LA 71295
^c Dep. of Agricultural Chemistry, LSU Ag Center, Baton Rouge, LA 70803

View larger version (22K): [in a new window]   Fig. 1. Effects of tillage and cover crop on fluometuron sorption isotherm in 0- to 3-cm (top) and 3- to 6-cm (bottom) Gigger soil.

View larger version (17K): [in a new window]   Fig. 2. Elution of a Cl- tracer pulse from a replicate conventional till (CT) vetch (top) and no till (NT) vetch (bottom) core. Best-fits of Eq. [1] to average Cl- concentrations in effluent fractions are shown as step functions.

View larger version (11K): [in a new window]   Fig. 3. Elution of fluometuron from a replicate conventional till (CT) native vegetation (top) and no till (NT) native vegetation (bottom) core. Best-fits of Eq. [1] and [2] to average concentrations in leachate from each rain event are shown as step functions (optimized values for first-order degradation rate constants used).

View larger version (11K): [in a new window]   Fig. 4. Elution of fluometuron from a replicate conventional till (CT) vetch (top) and no till (NT) vetch (bottom) core. Best-fits of Eq. [1] and [2] to average concentrations in leachate from each rain event are shown as step functions (optimized values for first-order degradation rate constants used).

View larger version (11K): [in a new window]   Fig. 5. Elution of fluometuron from a replicate conventional till (CT) wheat (top) and no till (NT) wheat (bottom) core. Best-fits of Eq. [1] and [2] to average concentrations in leachate from each rain event are shown as step functions (optimized values for first-order degradation rate constants used).