NEW MEXICO CLIMATE CENTER
	IRRIGATION SCHEDULING MODEL INFORMATION

About IRRSCH

IRRSCH is a computer model that allows the user to evaluate current irrigation practices, and to schedule future irrigations based on recent events relative to the field under consideration. The program can be used under a variety of different types of irrigation management practices. There are now three versions of the program; The only significant difference between the versions is the total soil profile size (number of layers). The windows versions have a maximum of 1000 layers, while the DOS version has a maximum of 100 layers.

• IMPORTANT! Do not use the windows 3.x version on Windows 95. The 3.x code is not upward compatible and will cause your system to crash, forcing you to re-start your computer! If you are running a Win95 system we encourage you to simply delete the 3.x version of the program after installation to avoid the risk of starting the wrong version.

The model has basic configurations set up for several different crops. Using these configurations, the expected yield, water consumption and plant development for each of the crops can be estimated. The user must generally provide only basic information to run the model. In particular, the user will need to have the following information:

• Soil type in the field.
• [Estimated] Initial soil moisture content in the field.
• Crop planting date.
• Date of first plant emergence (usually about 10 days from planting).
• Climate data for the location of the field.
• The management practice to be used.

With this information the user can edit the configuration files to set up the model for the desired conditions. Detailed information about how to set up and run the program are provided in the document (Wordperfect 6.x format) that comes with the software when you download it from this site.

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