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PRZM: Pesticide Root Zone Model

The Pesticide Root Zone Model (PRZM-2) is a one-dimensional, dynamic, compartmental model that can be used to simulate chemical movement in unsaturated soil systems within and immediately below the plant root zone. It has two major components-- hydrology (and hydraulics) and chemical transport.
The model was specifically designed to provide loadings to selected media, including air, water, groundwater and plants. PRZM 2 is a daily-time-step agricultural field simulation model. Outputs include pesticide leaching depth, runoff volume, eroded sediment mass, pesticide movement with eroded sediment and runoff, and pesticide volatilization. Processes modeled include water movement through the soil profile, crop uptake, vapor phase transport, and irrigation. Two pesticide degradates can be modeled along with the parent. PRZM 2 has incorporated the VADOFT program which estimates chemical movement through the vadose zone below the surface soil. A Monte Carlo shell is also included.


area: ground water
objectives: simulation, analysis
description: metals, pesticides, pesticides movements, compartmental model, root zone, plant uptake, mono-dimensional domains, unsaturated media, transport


The program is available at:

National Technical Information Service (NTIS)
Springfield, VA 22161 - U.S.A.
Telephone 703/487-4650


Robert F. Carsel, Charles N. Smith, Lee A. Mulkey, J. David Deanø and Peter Jowiseø
Environmental Research Laboratory, U.S. EPA, Athens GA 30613 - U.S.A.
Andersen-Nichols, Inc., 2666 East Bayshore Road, Palo Alto CA 94549 - U.S.A.


  • "Users Manual for the Pesticide Root Zone Model, Release 1" (EPA 600/3-84-109) NTIS Accession Number: PB85 158913/AS.



Estratto dalla banca modelli del progetto CEE GAIA INCO - www.ess.co.at/GAIA