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Temporal Dynamics of Preferential Flow to a Subsurface Drain

^a USDA-ARS-National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011-3120
^b Agricultural & Biosystems Engineering, Iowa State Univ., Ames, IA 50011
^c Dep. Soil Science, Univ. of Wisconsin, Madison, WI 53706

View larger version (22K): [in a new window]   Fig. 1. Schematic diagram of irrigation plot showing location of subsurface drain pipe, tracer strip, irrigation grid, sump, and deep soil cores.

View larger version (18K): [in a new window]   Fig. 2. Hourly and cumulative irrigation [day of year, (DOY 182)] and precipitation (DOY > 182) from the start of irrigation on DOY 181.5.

View larger version (32K): [in a new window]   Fig. 3. Timing of irrigation and rain, tile flow rate, and conservative tracer concentrations in tile effluent versus day of year (DOY) for entire monitoring period. Also shown are simulated Br concentrations.

View larger version (24K): [in a new window]   Fig. 4. Timing of conservative tracer application (arrows), tile flow rate, and conservative tracer concentrations in tile effluent versus time from start of irrigation. Only first 10 h of irrigation are shown.

View larger version (22K): [in a new window]   Fig. 5. Timing of irrigation and rain, tile flow rate, and herbicide concentrations in tile effluent versus day of year (DOY) for entire monitoring period.

View larger version (18K): [in a new window]   Fig. 6. Tile flow rate and herbicide concentrations in tile effluent versus time since start of irrigation. Only first 10 h of irrigation are shown.

View larger version (19K): [in a new window]   Fig. 7. Average relative mass recovered and standard error of mean (SE) of conservative tracers and simulated Br mass in soil profile 20 d after application.

View larger version (16K): [in a new window]   Fig. 8. Average relative mass and standard error of mean (SE) of recovered herbicides in soil profile 20 d after application.