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Published online 1 March 2008
Published in J Environ Qual 37:429-436 (2008)
DOI: 10.2134/jeq2007.0279
© 2008 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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In Situ Bioreactors and Deep Drain-Pipe Installation to Reduce Nitrate Losses in Artificially Drained Fields

Dan B. Jaynes*, Tom C. Kaspar, Tom B. Moorman and Tim B. Parkin

National Soil Tilth Lab., USDA-ARS, 2110 University Blvd., Ames, IA 50011


Figure 1
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  		Fig. 1. Daily flow rate and cumulative tile flow for 2001–2005 for the control treatment (CN) plot with the most drainage.

 

Figure 2
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  		Fig. 2. Nitrate concentration in tile drainage from four plots each of the control (CN), denitrification wall (DW), and deep tile (DT) treatments and the average concentration (lines) for each treatment in 2004.

 

Figure 3
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  		Fig. 3. Relationships between tile flow and NO3 mass flux for the (a) control (CN), (b) deep tile (DT), and(c) denitrification wall (DW) treatments from 2001–2005. Isolines (1 and 10 mg L–1) provide orientation to interpret NO3 concentration. Values in figure are the best fit slope and 95% confidence levels of the log-transformed data.

 




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