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Subsurface Drain Losses of Water and Nitrate following Conversion of Perennials to Row Crops

David R. Hugginsa, Gyles W. Randallb and Michael P. Russellec

a USDA-ARS, Land Management and Water Conserv. Res. Unit, 215 Johnson Hall, Washington State Univ., Pullman, WA 99164-6421
b Univ. of Minnesota Southern Res. and Outreach Center, Waseca, MN 56093
c Plant Science Res. Unit, USDA-ARS, U.S. Dairy Forage Research Center, St. Paul, MN 55108-6028



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  		Fig. 1. Relationship between water supply (Ws) and subsurface drainage (Wsd) for cropping systems in phase one (1989–1993) and after conversion of CRP and ALF in phase two (1994–1996)

 


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  		Fig. 2. Cropping system effects on soil profile distribution of residual fall NO3–N (0–3.0 m)

 


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  		Fig. 3. Cropping system effects on flow volumes, flow-weighted NO3–N concentrations, and NO3–N losses through subsurface drains. Data are reported for only those months when subsurface drainage occurred

 




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