Comparison of three irrigation scheduling methods in the arid southwestern US

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

Research output: Contribution to journalConference articlepeer-review


During the 1988 and 1989 growing seasons, three irrigation scheduling methods were compared at two locations in Arizona. Cotton was used as the test crop in a randomized complete block statistical design with three treatments and three replications. The three methods were; a soil water balance model based on historic consumptive use curves; a soil water balance model based on the Modified Penman Equation using daily weather from the Arizona Meteorological Network (AZMET); and infrared thermometry using the Crop Water Stress Index (CWSI). Yield results at both locations and both years show there was no significant statistical difference between the three methods. However, both years there was a significant difference at one location in the total amount of irrigation water applied by one of the scheduling methods. Although one method used more water than the others, all three methods of irrigation scheduling could be used by growers to improve their irrigation water management.

Original languageEnglish (US)
Pages (from-to)287-291
Number of pages5
JournalASAE Publication
Issue number4-90
StatePublished - 1990
EventProceedings of the Third National Irrigation Symposium held in conjunction with the 11th Annual International Irrigation Exposition - Phoenix, AZ, USA
Duration: Oct 28 1990Nov 1 1990

ASJC Scopus subject areas

  • General Engineering


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