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Measured and Predicted Solute Leaching from Multiple Undisturbed Soil Columns

^a NSTL, 2150 Pammel Dr., Ames, IA 50011-3120
^b BASF, Ag. Prod. Center, 26 Davis Dr., P.O. Box 13528, Res. Triangle Park, NC 27709-3528

View larger version (77K): [in a new window]   Fig. 1. Diagram of column showing the horizontal measurement planes for hydraulic conductivity as a function of head, K(h). Each measurement plane was the top depth for an undisturbed sample taken for bulk density and Ks (saturated). The model was run with eight depths, two for each of the measured sections. Loose soil was taken for particle-size analysis.

View larger version (27K): [in a new window]   Fig. 2. Predicted drainage vs. measured drainage for the twelve treatment combinations. Each predicted point was the mean of three replicates, and each measured point was the mean of four replicates.

View larger version (30K): [in a new window]   Fig. 3. Predicted tritium leached vs measured tritium leached for the twelve treatment combinations. Each predicted point was the mean of three replicates, and each measured point was the mean of four replicates.

View larger version (29K): [in a new window]   Fig. 4. Predicted Br leached vs. measured bromide leached for the twelve treatment combinations. Each predicted point was the mean of three replicates, and each measured point was the mean of four replicates.

View larger version (55K): [in a new window]   Fig. 5. Measured Br concentration as a function of outflow volume for each soil–tillage–intensity combination.

View larger version (51K): [in a new window]   Fig. 6. Measured tritium reduced concentration as a function of outflow volume for each soil–tillage–intensity combination.

View larger version (34K): [in a new window]   Fig. 7. Mean predicted Br concentration at specified volume outflows for the high and low first rain intensity treatments and RMSE for each soil–tillage combination. Outflow for each rain event was about 20%.

View larger version (33K): [in a new window]   Fig. 8. Mean predicted Br concentration at specified volume outflows for the high and low first rain intensity treatments and RMSE for each soil–tillage combination. Outflow for each rain event was about 20%.