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Nitrate Nitrogen in Surface Waters as Influenced by Climatic Conditions and Agricultural Practices

^a Southern Experiment Station, Univ. of Minnesota, Waseca, MN 56093
^b Dep. of Soil, Water, and Climate, Univ. of Minnesota, St. Paul, MN 55108

View larger version (21K): [in a new window]   Fig. 1. Fertilizer N sold and rate of application for the nine-state midwestern area draining into the Mississippi River basin

View larger version (24K): [in a new window]   Fig. 2. Relationship between subsurface tile drainage and (a) annual flow-weighted nitrate N concentration and (b) annual nitrate N loss in tile drainage water from a corn–soybean rotation that received 150 kg N/ha as anhydrous ammonia in late October each year following soybean at Waseca, MN

View larger version (27K): [in a new window]   Fig. 3. Relationship between subsurface tile drainage and (a) annual flow-weighted nitrate N concentration and (b) annual nitrate N loss in tile drainage water from continuous corn that received 200 kg N/ha each spring at Waseca, MN

View larger version (28K): [in a new window]   Fig. 4. Long-term precipitation patterns (inches) within the Minnesota River Basin

View larger version (68K): [in a new window]   Fig. 5. Major watersheds within the Minnesota River basin

View larger version (43K): [in a new window]   Fig. 6. Fraction of the total nitrate N loading from major watersheds within the Minnesota River basin

View larger version (20K): [in a new window]   Fig. 7. Average daily nitrate N yields (365 d/yr) from major watersheds within the Minnesota River basin

View larger version (24K): [in a new window]   Fig. 8. Temporal changes in nitrate N loading from the Greater Blue Earth River watershed in relationship to annual precipitation recorded at Waseca from 1982–1994