AZSCHED - software for real-time irrigation scheduling

F. A. Fox, D. C. Slack, L. J. Clark, T. F. Scherer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations


A user-friendly computer based scheduling program was developed to minimize the amount of data which needs to be input by the user by utilizing a network of twenty automated weather stations in Arizona. Irrigation scheduling is performed using a soil water balance approach. The Modified Penman equation is used to calculate reference evapotranspiration and crop coefficients are based on growing-degree-days. These methods make this model highly adaptable to a variety of climatological conditions without loss of accuracy. Accuracy can be compromised through the use of inaccurate inputs by the user. The sensitivity of the model to different user inputs under Arizona conditions are presented, showing that the model is most sensitive to the inputs used for irrigation efficiency and applied irrigation volume. Recommendations for rational use of this method require either measurement of irrigation volumes applied or periodic correction of the soil water balance through field measurements.

Original languageEnglish (US)
Title of host publicationManagement of Irrigation and Drainage Systems
Subtitle of host publicationIntegrated Perspectives
PublisherPubl by ASCE
Number of pages8
ISBN (Print)0872629198
StatePublished - 1993
EventManagement of Irrigation and Drainage Systems : Integrated Perspectives - Park City, UT, USA
Duration: Jul 21 1993Jul 23 1993

Publication series

NameManagement of Irrigation and Drainage Systems : Integrated Perspectives


OtherManagement of Irrigation and Drainage Systems : Integrated Perspectives
CityPark City, UT, USA

ASJC Scopus subject areas

  • General Engineering


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