Field evaluation of a model for predicting nitrogen losses from drained lands.

The N simulation model, DRAINMOD-N II, was field-tested using a 6-yr data set from an artificially drained agricultural site located in eastern North Carolina. The test site is on a nearly flat sandy loam soil which is very poorly drained under natural conditions. Four experimental plots, planted to a corn (Zea mays)-wheat (Triticum aestivum L.)-soybean (Glycine max.) rotation and managed using conventional and controlled drainage, were used in model testing. Water table depth, subsurface drainage, and N concentration in drain flow were measured and meteorological data were recorded continuously. DRAINMOD-N II was calibrated using the data from one plot; data sets from the other three plots were used for model validation. Simulation results showed an excellent agreement between observed and predicted nitrate-nitrogen (NO(3)-N) losses in drainage water over the 6-yr period and a reasonable agreement on an annual basis. The agreement on a monthly basis was not as good. The Nash-Sutcliffe modeling efficiency (EF) for monthly predictions was 0.48 for the calibration plot and 0.19, 0.01, and -0.02 for the validation plots. The value of the EF for yearly predictions was 0.92 for the calibration plot and 0.73, 0.62, and -0.10 for the validation plots. Errors in predicting cumulative NO(3)-N losses over the 6-yr period were remarkably small; -1.3% for the calibration plot, -8.1%, -2.8%, and 4.0% for the validation plots. Results of this study showed the potential of DRAINMOD-N II for predicting N losses from drained agricultural lands. Further research is needed to test the model for different management practices and soil and climatological conditions.

[1]  N. R. Fausey,et al.  Water Management Model Evaluation for North Central Ohio , 1981 .

[2]  W. Parton,et al.  Analysis of factors controlling soil organic matter levels in Great Plains grasslands , 1987 .

[3]  James L. Fouss,et al.  Simulating subsurface drainage in the lower Mississippi Valley with DRAINMOD. , 1987 .

[4]  R. W. Skaggs,et al.  THE NITROGEN SIMULATION MODEL, DRAINMOD-N II , 2005 .

[5]  J. Doran,et al.  Effect of water-filled pore space on carbon dioxide and nitrous oxide production in tilled and nontilled soils [Maize; Illinois; Kentucky; Minnesota; Nebraska] , 1984 .

[6]  I. Bingham,et al.  The management of wheat, barley, and oat root systems , 2001 .

[7]  Parameter selection and testing the soil nitrogen dynamics model SOILN , 1998 .

[8]  R. W. Skaggs,et al.  Field-evaluation of DRAINMOD for predicting waterlogging intensity and drain performance in South-Western Australia , 1994 .

[9]  Joe T. Ritchie,et al.  Evaluation of the CERES-Maize water and nitrogen balances under tile-drained conditions , 1999 .

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

[11]  R. W. Skaggs,et al.  DRAINMOD-N, A NITROGEN MODEL FOR ARTIFICIALLY DRAINED SOIL , 1992 .

[12]  R. Hay,et al.  Harvest index: a review of its use in plant breeding and crop physiology , 1995 .

[13]  J. K. Koelliker,et al.  Mechanistic model for predicting ammonia volatilization from urea. , 1988 .

[14]  R. W. Skaggs,et al.  A water management model for shallow water table soils , 1978 .

[15]  Jorge A. Delgado,et al.  Principles for managing nitrogen leaching , 2002 .

[16]  R. W. Skaggs,et al.  STRESS DAY INDEX MODELS TO PREDICT CORN AND SOYBEAN RELATIVE YIELD UNDER HIGH WATER TABLE CONDITIONS , 1991 .

[17]  Robert J. Scholes,et al.  Observations and modeling of biomass and soil organic matter dynamics for the grassland biome worldwide , 1993 .

[18]  P. Heuberger,et al.  Calibration of process-oriented models , 1995 .

[19]  M. Youssef.  Modeling Nitrogen Transport and Transformations in High Water Table Soils , 2004 .

[20]  J. S. Rogers,et al.  Water Management Model Evaluation for SHallow Sandy Soils , 1985 .

[21]  L. Ahuja.  Root zone water quality model : modelling management effects on water quality and crop production , 2000 .

[22]  M. Kirschbaum,et al.  The temperature dependence of soil organic matter decomposition, and the effect of global warming on soil organic C storage , 1995 .

[23]  D. D. Fritton,et al.  Field Validation and Comparison of LEACHM and NCSWAP Models for Predicting Nitrate Leaching , 1993 .

[24]  R. W. Skaggs,et al.  Field Evaluation of a Water Management Simulation Model , 1982 .

[25]  Lars Bergström,et al.  Simulated nitrogen dynamics and losses in a layered agricultural soil , 1987 .

[26]  E. Epstein,et al.  Nitrogen Mineralization-Water Relations in Soils , 1974 .

[27]  R. W. Skaggs,et al.  DRAINMOD modifications for cold conditions , 2000 .

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

[29]  Modeling Nitrate Nitrogen Leaching in Response to Nitrogen Fertilizer Rate and Tile Drain Depth or Spacing for Southern Minnesota, USA , 2000 .

[30]  R. Allen,et al.  Evapotranspiration and Irrigation Water Requirements , 1990 .

[31]  D. C. Godwin,et al.  Nitrogen dynamics in soil-plant systems. , 1991 .