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Research ArticleResearch Section

Changes in yield and nitrate losses from using drainage water management in central Iowa, United States

D.B. Jaynes
Journal of Soil and Water Conservation November 2012, 67 (6) 485-494; DOI: https://doi.org/10.2489/jswc.67.6.485
D.B. Jaynes
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Abstract

Drainage water management (DWM) is a potentially valuable management practice for reducing NO3 losses to surface waters in areas of artificial drainage. But the practice is essentially untested in Midwest United States conditions and its water quality and crop yield benefits uncertain. This paper reports results from applying DWM to a 22 ha (54 ac) production field in central Iowa as part of a five-state Conservation Innovative Grant effort to document the impact of DWM across the Midwest. Three of nine plots in an existing tile drainage research site were retrofitted with control structures so that the drainage level could be controlled. Water flow from the tile in each plot, NO3 concentration in the drainage, and crop yield were measured over a four year period from 2006 to 2009. The field was in a two year corn (Zea mays L.)–soybean (Glycine max [L.] Merr.) rotation with nitrogen (N) fertilizer applied before the corn crop only. During four years of monitoring tile flow, there was a significant (p = 0.05) 21% decrease in tile flow, no significant decrease in NO3 concentration, and a significant 29% reduction in NO3 load leaching from the DWM treatment compared to conventional drainage. No yield benefits from DWM were observed for the two year average for corn (2006 and 2008), but a significant yield increase of 8% was observed for the two year average for soybean (2007 and 2009). For the four years monitored in this study, it is unclear if the yield increase for soybean versus no increase for corn was due to weather patterns or because corn and soybean responded differently to the raised water table caused by DWM.

  • © 2012 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 67 (6)
Journal of Soil and Water Conservation
Vol. 67, Issue 6
November/December 2012
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Changes in yield and nitrate losses from using drainage water management in central Iowa, United States
D.B. Jaynes
Journal of Soil and Water Conservation Nov 2012, 67 (6) 485-494; DOI: 10.2489/jswc.67.6.485

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Changes in yield and nitrate losses from using drainage water management in central Iowa, United States
D.B. Jaynes
Journal of Soil and Water Conservation Nov 2012, 67 (6) 485-494; DOI: 10.2489/jswc.67.6.485
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