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Retention and Runoff Losses of Atrazine and Metribuzin in Soil

Agronomy Dep., Louisiana State Univ. AgCenter, Baton Rouge, LA 70803

View larger version (21K): [in a new window]   Fig. 1. Metribuzin concentration in soil solution versus time during adsorption for Commerce soil with different initial concentrations (C0). Solid curves are predictions using the multireaction model (MRM).

View larger version (24K): [in a new window]   Fig. 2. Atrazine concentration in soil solution versus time during adsorption for Commerce soil with different initial concentrations (C0). Solid curves are predictions using the multireaction model (MRM).

View larger version (22K): [in a new window]   Fig. 3. Adsorption isotherms for metribuzin by Commerce soil for 2-, 24-, and 384-h reaction times.

View larger version (16K): [in a new window]   Fig. 4. Distribution coefficient (Kd) versus reaction time for metribuzin and atrazine by Commerce soil.

View larger version (25K): [in a new window]   Fig. 5. Adsorption isotherms for atrazine by Commerce soil for 2-, 24-, and 384-h reaction times. Solid curves are predictions using a linear model.

View larger version (27K): [in a new window]   Fig. 6. Adsorption and desorption isotherms for metribuzin by Commerce soil and different initial concentrations (C0).

View larger version (28K): [in a new window]   Fig. 7. Adsorption and desorption isotherms for atrazine by Commerce soil and different initial concentrations (C0).

View larger version (23K): [in a new window]   Fig. 8. Atrazine concentrations in water runoff from the broadcast, 0.9-m band, and 0.6-m band treatments during 1994 (average of two replications).

View larger version (20K): [in a new window]   Fig. 9. Atrazine concentrations in water runoff from the broadcast, 0.9-m band, and 0.6-m band treatments during 1995 (average of two replications).

View larger version (27K): [in a new window]   Fig. 10. Metribuzin concentrations in water runoff from the broadcast, 0.9-m band, and 0.6-m band treatments during 1994 (average of two replications).

View larger version (24K): [in a new window]   Fig. 11. Metribuzin concentrations in water runoff from the broadcast, 0.9-m band, and 0.6-m band treatments during 1995 (average of two replications).

View larger version (26K): [in a new window]   Fig. 12. Extractable atrazine concentrations from the surface soil from all treatments during 1994 (top) and 1995 (bottom). Solid curves are predictions using Model 3.

View larger version (27K): [in a new window]   Fig. 13. Extractable metribuzin concentrations from the surface soil from all treatments during 1994 (top) and 1995 (bottom). Solid curves are predictions using Model 3.