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Simulating Nitrate Drainage Losses from a Walnut Creek Watershed Field

^a Dep. of Agricultural and Biosystems Engineering, Iowa State Univ
^b USDA-ARS, National Soil Tilth Laboratory, Ames, IA 50011
^c USDA-ARS, Great Plains System Research Unit, Fort Collins, CO 80522

View larger version (25K): [in a new window]   Fig. 1. Root Zone Water Quality Model with Windows interface simulations for (a) subsurface drainage and (b) NO3–N losses in subsurface drainage water in relation to rainfall for 1992. DOY, day of year.

View larger version (35K): [in a new window]   Fig. 2. Root Zone Water Quality Model with Windows interface simulations for (a) subsurface drainage and (b) NO3–N losses in subsurface drainage water in relation to rainfall for 1993. DOY, day of year.

View larger version (22K): [in a new window]   Fig. 3. Root Zone Water Quality Model with Windows interface simulations for (a) subsurface drainage and (b) NO3–N losses in subsurface drainage water in relation to rainfall for 1994. DOY, day of year.

View larger version (24K): [in a new window]   Fig. 4. Root Zone Water Quality Model with Windows interface simulations for (a) subsurface drainage and (b) NO3–N losses in subsurface drainage water in relation to rainfall for 1995. DOY, day of year.

View larger version (29K): [in a new window]   Fig. 5. Root Zone Water Quality Model with Windows interface simulations for (a) subsurface drainage and (b) NO3–N losses in subsurface drainage water in relation to rainfall for 1996. DOY, day of year.

View larger version (25K): [in a new window]   Fig. 6. Root Zone Water Quality Model with Windows interface simulations for (a) subsurface drainage and (b) NO3–N losses in subsurface drainage water in relation to rainfall for 1997.

View larger version (25K): [in a new window]   Fig. 7. Root Zone Water Quality Model with Windows interface scenario simulations for corn yields and nitrate leaching loss with subsurface drainage for (a) 1993 and (b) 1995.

View larger version (23K): [in a new window]   Fig. 8. Root Zone Water Quality Model with Windows interface scenario simulations for corn yields and nitrate leaching losses with subsurface drainage flows for (a) 1997 and (b) 1993, 1995, and 1997.