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

Gyles W. Randalla and David J. Mullab

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



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Fig. 1. Fertilizer N sold and rate of application for the nine-state midwestern area draining into the Mississippi River basin

 


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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

 


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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

 


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Fig. 4. Long-term precipitation patterns (inches) within the Minnesota River Basin

 


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Fig. 5. Major watersheds within the Minnesota River basin

 


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Fig. 6. Fraction of the total nitrate N loading from major watersheds within the Minnesota River basin

 


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Fig. 7. Average daily nitrate N yields (365 d/yr) from major watersheds within the Minnesota River basin

 


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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

 





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The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
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Soil Science Society of America Journal
Copyright © 2001 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.