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Prediction of Boron Adsorption by Field Samples of Diverse Textures

Contribution from USDA-ARS, George E. Brown Jr., Salinity Lab., 450 W. Big Springs Road, Riverside, CA 92507

View larger version (49K): [in a new window]   Fig. 1. Map showing Section 4-2 of the Broadview Water District in the San Joaquin Valley of California. Variations in clay content with depth from 0 to 150 cm are shown. Locations of Sites 9, 33, and 49 are also indicated.

View larger version (24K): [in a new window]   Fig. 2. Constant capacitance modeling of B adsorption on Site 9 of the Lillis soil: a) 0- to 30-cm depth; b) 30- to 60-cm depth; c) 60- to 90-cm depth; d) 90- to 120-cm depth; e) 120- to 150-cm depth. Squares represent experimental data. Model fits are represented by solid lines. Depth-specific model predictions are represented by dashed lines.

View larger version (24K): [in a new window]   Fig. 3. Constant capacitance modeling of B adsorption on Site 33 of the Lillis soil: a) 0- to 30-cm depth; b) 30- to 60-cm depth; c) 60- to 90-cm depth; d) 90- to 120-cm depth; e) 120- to 150-cm depth. Squares represent experimental data. Model fits are represented by solid lines. Depth-specific model predictions are represented by dashed lines.

View larger version (23K): [in a new window]   Fig. 4. Constant capacitance modeling of B adsorption on Site 49 of the Lillis soil: a) 0- to 30-cm depth; b) 30- to 60-cm depth; c) 60- to 90-cm depth; d) 90- to 120-cm depth; e) 120- to 150-cm depth. Squares represent experimental data. Model fits are represented by solid lines. Depth-specific model predictions are represented by dashed lines.

View larger version (41K): [in a new window]   Fig. 5. Model predicted versus experimentally observed B adsorption for Site 9: a) optimized fit, OF; b) predicted from prediction equations for that specific depth, PE; c) predicted using parameters for Site 9 0- to 30-cm depth, PEs9; d) predicted using parameters for Site 33 0- to 30-cm depth, PEs33; e) predicted using parameters for Site 49 0- to 30-cm depth, PEs49.

View larger version (42K): [in a new window]   Fig. 6. Model predicted versus experimentally observed B adsorption for Site 33: a) optimized fit, OF; b) predicted from prediction equations for that specific depth, PE; c) predicted using parameters for Site 9 0- to 30-cm depth, PEs9; d) predicted using parameters for Site 33 0- to 30-cm depth, PEs33; e) predicted using parameters for Site 49 0- to 30-cm depth, PEs49.

View larger version (41K): [in a new window]   Fig. 7. Model predicted versus experimentally observed B adsorption for Site 49: a) optimized fit, OF; b) predicted from prediction equations for that specific depth, PE; c) predicted using parameters for Site 9 0- to 30-cm depth, PEs9; d) predicted using parameters for Site 33 0- to 30-cm depth, PEs33; e) predicted using parameters for Site 49 0- to 30-cm depth, PEs49.