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Influence of Alternative and Conventional Farming Practices on Subsurface Drainage and Water Quality

^a Mississippi Watershed Management Organization, 2520 Larpenteur Ave. W., Lauderdale, MN 55113
^b Southwest Research and Outreach Center, Univ. of Minnesota, 23669 130th St., Lamberton, MN 56152
^c Dep. of Soil, Water, and Climate, Univ. of Minnesota, 1991 Upper Buford Circle, St. Paul, MN 55108

View larger version (29K): [in this window] [in a new window]   Fig. 1. Location of the study site near Lamberton, MN within the USA.

View larger version (141K): [in this window] [in a new window]   Fig. 2. Subsurface drainage design for the alternative and conventional fields.

View larger version (20K): [in this window] [in a new window]   Fig. 3. Cumulative precipitation (mm) for the period of study (2002–2004). The 40-yr average precipitation at Lamberton, MN is 670 mm.

View larger version (18K): [in this window] [in a new window]   Fig. 4. Alternative (Elwell) and conventional (northwest [NW], southeast [SE]) drainage flow rates (mm s–1) and daily precipitation (mm) for 2002.

View larger version (15K): [in this window] [in a new window]   Fig. 5. Alternative (Elwell) and conventional (northwest [NW], southeast [SE]) drainage flow rates (mm s–1) and daily precipitation (mm) for 2003.

View larger version (23K): [in this window] [in a new window]   Fig. 6. Alternative (Elwell) and conventional (northwest [NW], southeast [SE]) drainage flow rates (mm s–1) and daily precipitation (mm) for 2004.

View larger version (32K): [in this window] [in a new window]   Fig. 7. Monthly subsurface drainage (cm) from alternative (AL) and conventional (CN) farming practices for the duration of the study.

View larger version (45K): [in this window] [in a new window]   Fig. 8. Monthly flow-weighted mean nitrate-nitrogen concentrations (mg N L–1) in subsurface drainage from alternative (AL) and conventional (CN) farming practices for the duration of the study.

View larger version (25K): [in this window] [in a new window]   Fig. 9. Monthly nitrate-nitrogen load (kg N ha–1) in subsurface drainage from alternative (AL) and conventional (CN) farming practices for the duration of the study.