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

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.

[1]  T. S. Colvin,et al.  Corn Yield and Nitrate Loss in Subsurface Drainage from Midseason Nitrogen Fertilizer Application , 2006 .

[2]  Thomas E. Fenton,et al.  Evaluation of the Accuracy of a Central Iowa Soil Survey and Implications for Precision Soil Management , 2003, Precision Agriculture.

[3]  Matthew J. Helmers,et al.  Temporal Subsurface Flow Patterns from Fifteen Years in North-Central Iowa , 2005 .

[4]  Quay Dortch,et al.  Nutrient changes in the Mississippi River and system responses on the adjacent continental shelf , 1996 .

[5]  J. D. Gaynor,et al.  Effect of controlled drainage and tillage on soil structure and tile drainage nitrate loss at the field scale , 1998 .

[6]  R. W. Skaggs,et al.  FIELD TESTING OF DRAINMOD-N , 1997 .

[7]  Ingmar Messing,et al.  Effects of controlled drainage on N and P losses and N dynamics in a loamy sand with spring crops , 2007 .

[8]  R. W. Skaggs,et al.  Effect of Drainage System Design and Operation on Nitrate Transport , 1981 .

[9]  L. Hewes,et al.  Occupying the Wet Prairie: The Role of Artificial Drainage in Story County, Iowa , 1952 .

[10]  K. Thorp,et al.  POTENTIAL WATER QUALITY IMPACT OF DRAINAGE WATER MANAGEMENT IN THE MIDWEST USA , 2010 .

[11]  R. W. Skaggs,et al.  Drainage Control to Diminish Nitrate Loss from Agricultural Fields 1 , 1979 .

[12]  D. Karlen,et al.  Nitrate loss in subsurface drainage as affected by nitrogen fertilizer rate. , 2001, Journal of environmental quality.

[13]  D. L. Thomas,et al.  Water table management for water quality improvement , 1992 .

[14]  L. C. Brown,et al.  Water Table Management, Nitrogen Dynamics, and Yields of Corn and Soybean , 1999 .

[15]  L. Kellman,et al.  Nitrate loading and isotopic signatures in subsurface agricultural drainage systems. , 2011, Journal of environmental quality.

[16]  C. Madramootoo,et al.  Effects of controlled drainage on nitrate concentrations in subsurface drain discharge , 1996 .

[17]  Prasanta Kumar Kalita,et al.  Effect of Water-table Management Practices on the Transport of Nitrate-N to Shallow Groundwater , 1993 .

[18]  Robert W. Malone,et al.  SIMULATING THE LONG-TERM PERFORMANCE OF DRAINAGE WATER MANAGEMENT ACROSS THE MIDWESTERN UNITED STATES , 2008 .

[19]  Ingmar Messing,et al.  Controlled drainage — effects on drain outflow and water quality , 2001 .

[20]  J. Hanway.  How a corn plant develops , 1966 .

[21]  R. Hirsch,et al.  Nitrate in the Mississippi River and Its Tributaries, 1980 to 2008: Are We Making Progress? , 2011, Environmental science & technology.

[22]  R P Hooper,et al.  Nitrogen input to the Gulf of Mexico. , 2001, Journal of environmental quality.

[23]  R C Littell,et al.  Mixed Models: Modelling Covariance Structure in the Analysis of Repeated Measures Data , 2005 .

[24]  James L. Fouss,et al.  Climate impacts on nitrate loss in drainage waters from a southern alluvial soil , 2004 .

[25]  J. Hatfield,et al.  Review and Interpretation: Nitrogen Management Strategies to Reduce Nitrate Leaching in Tile-Drained Midwestern Soils , 2002 .

[26]  Jarmila Solárová,et al.  Fundamentals of Soil Science , 1979, Biologia Plantarum.

[27]  R. E. Turner,et al.  Predicting summer hypoxia in the northern Gulf of Mexico: riverine N, P, and Si loading. , 2006, Marine pollution bulletin.

[28]  R. Wayne Skaggs,et al.  Controlled versus Conventional Drainage Effects on Water Quality , 1995 .

[29]  J. Gilliam,et al.  Water Table Management Effects on Denitrification and Nitrous Oxide Evolution , 1995 .

[30]  Thomas S. Colvin,et al.  Using Soil Attributes and GIS for Interpretation of Spatial Variability in Yield , 2000 .

[31]  W. J. Busscher,et al.  Soil and crop management aspects of water table control practices , 1992 .

[32]  L. Gentry,et al.  Timing of riverine export of nitrate and phosphorus from agricultural watersheds in Illinois: implications for reducing nutrient loading to the Mississippi River. , 2006, Environmental science & technology.

[33]  T. S. Colvin.  Technical Note: Automated Weighing and Moisture Sampling for a Field-Plot Combine , 1990 .

[34]  Stephen L. Johnson,et al.  HYPOXIA IN THE NORTHERN GULF OF MEXICO , 2000 .

[35]  D. Jaynes,et al.  In situ bioreactors and deep drain-pipe installation to reduce nitrate losses in artificially drained fields. , 2008, Journal of environmental quality.

[36]  Jerry L. Hatfield,et al.  Water Quality in Walnut Creek Watershed: Herbicides and Nitrate in Surface Waters , 1999 .

[37]  Jane R. Frankenberger,et al.  Simulated effect of drainage water management operational strategy on hydrology and crop yield for Drummer soil in the Midwestern United States , 2009 .

[38]  Gregory E Schwarz,et al.  Incorporating Uncertainty Into the Ranking of SPARROW Model Nutrient Yields From Mississippi/Atchafalaya River Basin Watersheds1 , 2009, Journal of the American Water Resources Association.

[39]  G. McIsaac,et al.  Sources of nitrate yields in the Mississippi River Basin. , 2010, Journal of environmental quality.