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Book: Methods of Introducing System Models into Agricultural Research
Published by: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America



  1.  p. 1-64
    Advances in Agricultural Systems Modeling 2.
    Methods of Introducing System Models into Agricultural Research

    Laj R. Ahuja and Liwang Ma (ed.)

    ISBN: 978-0-89118-196-5


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A Protocol for Parameterization and Calibration of RZWQM2 in Field Research

  1. L. Ma,
  2. L.R. Ahuja,
  3. S.A. Saseendran,
  4. R.W. Malone,
  5. T.R. Green,
  6. B.T. Nolan,
  7. P.N.S. Bartling,
  8. G.N. Flerchinger,
  9. K.J. Boote and
  10. G. Hoogenboom
  1. L. Ma (Liwang.ma@ars.usda.gov), L.R. Ahuja, S.A. Saseendran, T.R. Green, and P.N.S. Bartling, USDA-ARS, Agricultural Systems Research Unit, Fort Collins, CO 80526; R.W. Malone, USDA-ARS, Natl. Lab. for Agric. and the Environment, Ames, IA 50011; B.T. Nolan, USGS, 413 National Center, Reston, VA 20192; G.N. Flerchinger, USDA-ARS, Northwest Watershed Research Center, Boise, ID 83712; K.J. Boote, Agronomy Dep., Univ. of Florida, Gainesville, FL 32611; G. Hoogenboom, AgWeatherNet, Washington State Univ., Prosser, WA 99350.


Use of agricultural system models in field research requires a full understanding of both the model and the system it simulates. This chapter provides a protocol on how to parameterize the USDA-ARS, Root Zone Water Quality Model (RZWQM2), which contains the DSSAT (Decision Support System for Agrotechnology Transfer) version 4.0 crop growth modules and the SHAW (Simultaneous Heat and Water) energy balance modules. It summarizes input data requirements of soil, weather, and plants, as well as the minimum data needed to calibrate the model. Calibration of each component or process is illustrated, along with possible adjustable parameters. An iterative procedure for model calibration is emphasized. Difficulties in model application are presented, along with possible solutions. However, the steps for model calibration are still in the trial-and-error stage and can vary from application to application. Model users should benefit from the materials in this chapter by combining them with those in the RZWQM2 user manual released with the model.

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