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Solute Movement through an Allophanic Soil

^a Forest Research, Private Bag 3020, Rotorua, New Zealand
^b HortResearch, Private Bag 11030, Palmerston North, New Zealand
^c Landcare Research, Private Bag 3127, Hamilton, New Zealand

View larger version (18K): [in a new window]   Fig. 1. Flow rates for various leaching experiments for (a) Column A and (b) Column B. (•) -100 mm Br step-up, continuous; () -20 mm Br step-down, continuous; () -20 mm Cl step-up, continuous; () -20 mm Cl step-down, intermittent; () -20 mm Br step-up, intermittent. The term I is drainage.

View larger version (14K): [in a new window]   Fig. 2. Measured and predicted (using convection–dispersion equation, CDE) concentrations of (a) bromide and (b) chloride for (•) Column A and () Column B as a function of drainage, I (mm). Both solutions were applied continuously.

View larger version (21K): [in a new window]   Fig. 3. Measured and predicted (solid lines) relative a for Column A, and time domain reflectometry (TDR) probe at () 5-, () 10-, and (+) 15-cm depths. The values for the model parameters were those obtained from the effluent.

View larger version (17K): [in a new window]   Fig. 4. Measured and predicted concentrations of (a) chloride and (b) bromide for (•) Column A and () Column B as a function of drainage, I (mm). Chloride was applied continuously, and bromide intermittently.

View larger version (16K): [in a new window]   Fig. 5. Measured and predicted concentrations of (a) bromide and (b) chloride for (•) Column A and () Column B as a function of drainage, I (mm). Bromide was washed out by continuous application with water, and chloride by intermittent water application.