Oklahoma State University

Temperature-Dependent Degradation Introduction, Soil Physics, Oklahoma State University

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Temperature -Dependent Degradation of Pesticides in Soils



D.L. Nofziger and Jinquan Wu


Pesticide degradation rates change as soil temperatures change. These changes can have a large impact upon concentrations remaining in the soil. The nature and magnitude of the change in temperature depends upon the application time, the depth of chemical in the soil, the surface soil temperature extremes, and the chemical properties of the pesticide. This software enables the user to specify values of these parameters and to view the resulting concentration as a function of time. The temperature dependent curves can be compared with constant temperature curves to see the impact of changing temperatures.

Latest Version:

2005.05.04,  May 4, 2005
Version History


A manual outlining the purpose, model, and simplifications used in this program is available here.


Computer Platform:

The software is written in Java and runs as a Web Start application. The Java  run-time package and Web Start software are  available free of charge from Sun Microsystems, Inc. The program was developed and tested on various Windows platforms as well as on Linux and MacOS X. We recommend 256 MB or more of Random Access Memory. Approximately 40 MB of disk space is required. 

Link for Java Software:

Before a Java Web Start program can be used on a computer, the supporting software must be installed. This is needed only 1 time per computer no matter how many different applications use it. Sun Microsystems Inc provides this package free of charge at http://java.sun.com/ or it can be downloaded here. If this is the first time you are using it, just download the file from the site above. Follow the instructions given there for installations. I recommend that you accept the default values proposed in the install process. 

Download/Execute Program:

Click here to download and start the program. If you use the program more than one time, you will be given the option of storing it on your local computer. You can then start the program without coming to this page with a web browser. 


D.L. Nofziger, Department of Plant and Soil Sciences, 368 Ag Hall, Oklahoma State University, Stillwater, OK 74078. 

E-mail: david.nofziger@okstate.edu

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