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Modelling Management Effects on Water Quality and Crop Production

Title: ROOT ZONE WATER QUALITY MODEL - Modelling Management Effects on Water Quality and Crop Production
Editors: L.R. Ahuja, K.W. Rojas, J.D. Hanson, M.J. Shaffer, L. Ma
Specifications: Soft Cover, 384 pp

ISBN-10: 1887201084
ISBN-13: 9781887201087

Price: US $95


RZWQM2 Version 3.00 is available for download from two locations:
USDA ARS Agsoftware Site ( Create an account, access download software tab, select RZWQM2 and save RZWQMsetup.exe.)
USDA ARS Products and Services Software site

Software Information: RZWQM2 Version 3.0 includes: Automated Input Parameter Optimization , Non-Linear uncertainty analysis and running scenarios with uncertainty for confidence band statistics for output. Irrigation Rules with daily, seasonal, monthly or over year limitations. Sub irrigation available. Massbalance of Carbon, Nitrogen, Water and Pesticides. GHG emissions and CO2 effects. Options added SHAW model running with observed canopy or model, ability to reset to observed soil water during the run and new plant water stress algorithms. Sediment Erosion. Storm data smoothing tools. Multiple Crop Growth models. Observed vs. Predicted Performance statistics and graphics.
- The Install is larger as the documentation directory now includes publications and manuals of component modules in addition to its expanded RZWQM2 User Guide. An overview document is also available in doc or pdf form at the site for download.
- Interface and Science Source Code for this version on the MSDEV C++ and Intel Fortran Platforms respectively is available on an https: site. Please contact Pat to request access.


The Root Zone Water Quality Model (RZWQM) is a comprehensive simulation model designed to predict the hydrologic response, including potential for surface and groundwater contamination, of alternative crop-management systems. It simulates crop development and the movement of water, nutrients and pesticides over and through the root zone for a representative unit area of an agricultural field over multiple years.

The model allows simulation of a wide spectrum of management practices and scenarios. These management alternatives include evaluation of: conservation tillage and residue cover versus conventional tillage; methods and timing of fertilizer and pesticide applications; manures and alternative chemical formulations; irrigation and drainage, and the methods and timing of water applications; and different crop rotations.

The model contains special features such as the rapid transport of surface-applied chemicals through macropores to deeper depths and the preferential transport of chemicals within the soil matrix via mobile-immobile zones. The transfer of surface-applied chemicals (pesticides in particular) to runoff water is also an important component.

To adequately evaluate the effect of certain long-term management practices on water quality and production, RZWQM can be run for up to 100 years using automated execution of certain management operations relative to crop growth stage in crop rotation, such as fertilizer application based on recommended formulas, irrigation scheduling, and harvesting. The unique features of the model are:

-> Agricultural management practices and their effects on crop production and environmental quality (tillage, irrigation, fertilization, manure application, tile drainage, pesticide application, and crop rotation).

-> Macropore/preferential flow.

-> Water table fluctuation.

-> Chemical transport in runoff/percolation water.

-> Detailed carbon/nitrogen dynamics with consideration of microbial populations.

-> Detailed plant physiological processes and plant population development.

-> Multiple year simulation with capability of answering 'what-if' scenarios.

-> Windows95/98™ based interface to facilitate data input and analysis.

-> On-line help to guide model parameterization. ISBN 1-887-201-08-4. Publ. 2000 WRP.

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