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Tillage Effects on Subsurface Drainage

^a Faculty of Environmental Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan
^b College of Agriculture, Osaka Prefecture University, 1-1 Gakuen-town, Sakai-city, Osaka 599-8531, Japan

View larger version (24K): [in a new window]   Fig. 1. Soil water retention curves for (a) sandy loam (tilled and untilled) and (b) sand.

View larger version (24K): [in a new window]   Fig. 2. Hydraulic conductivity as a function of water content for (a) sandy loam (tilled and untilled) and (b) sand.

View larger version (19K): [in a new window]   Fig. 3. Measured values for cumulative subsurface drainage discharge for Column 1 (solid circle) and Column 2 (open triangle) during the preliminary experiment from Day 239 to 243.

View larger version (15K): [in a new window]   Fig. 4. Profiles of pressure heads at the start of the major experiment (0000 h on Day 247). This profile was used as the initial conditions for the drainage simulations.

View larger version (28K): [in a new window]   Fig. 5. Simulated and measured values for cumulative subsurface drainage discharge in the tilled and the untilled column, during Day 247 to 255 in 1993.

View larger version (40K): [in a new window]   Fig. 6. Simulated and experimental results of the temporal changes in pressure head at depths of 5, 10, 25, 45, 65, and 80 cm, with rainfall, from Day 247 to 255 in 1993.

View larger version (22K): [in a new window]   Fig. 7. Cumulative subsurface drainage discharges for the simulated tillage depths of 2, 10, 40, and 60 cm.