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Water Quality Modeling of Fertilizer Management Impacts on Nitrate Losses in Tile Drains at the Field Scale

^a International Water Management Inst., PO Box 2075, Colombo, Sri Lanka
^b USDA-CPRL-ARS, PO Drawer 10, 2300 Experiment Station Rd., Bushland, TX 79012
^c Dep. Soil, Water and Climate, 1991 Upper Buford Cir., 439 Borlaug Hall, Univ. of Minnesota, St. Paul, MN 55108
^d Dep. Bioproducts and Biosystems Engineering, 1390 Eckles Ave., Univ. of Minnesota, St. Paul, MN 55108

View larger version (38K): [in this window] [in a new window]   Fig. 1. Location of site in Minnesota.

View larger version (20K): [in this window] [in a new window]   Fig. 2. Measured growing season flow-weighted mean nitrate concentrations in the west field from 1995–2003. Values in parentheses for corn years are N fertilizer application rates. No fertilizer was applied before planting soybeans.

View larger version (19K): [in this window] [in a new window]   Fig. 3. Comparison between predicted and observed monthly subsurface tile drainage as a function of precipitation for the west field during the calibration period.

View larger version (15K): [in this window] [in a new window]   Fig. 4. Comparison between predicted and observed monthly nitrate losses for the west field during the calibration period

View larger version (17K): [in this window] [in a new window]   Fig. 5. Comparison between predicted and observed monthly subsurface tile drainage flow as a function of precipitation during validation on the west field.

View larger version (11K): [in this window] [in a new window]   Fig. 6. Comparison between predicted and observed monthly nitrate losses during validation on the west field.

View larger version (25K): [in this window] [in a new window]   Fig. 7. Comparison between predicted and observed monthly subsurface tile drainage flows as a function of precipitation during validation on the east field.

View larger version (16K): [in this window] [in a new window]   Fig. 8. Comparison between predicted and observed monthly nitrate losses during validation on the east field.

View larger version (16K): [in this window] [in a new window]   Fig. 9. Comparison of predicted annual nitrate losses for changes in nitrogen application rate and timing.