Crop Yield Models Adapted to Irrigation Scheduling Programs

by R. W. Hill, Utah State Univ, Logan, UT, USA,
R. J. Hanks, Utah State Univ, Logan, UT, USA,
J. L. Wright, Utah State Univ, Logan, UT, USA,



Document Type: Proceeding Paper

Part of: Irrigation Systems for the 21st Century

Abstract: A crop yield model (CRPSM) was adapted to match the data obtained with typical irrigation scheduling programs. Daily soil water content was calculated from weather data, crop growth stage progress and transpiration coefficients. Relative yield was determined as a multiple product function of relative transpiration from each of the growth stages. Reasonable agreement was realized between model soil water estimates and field neutron probe measurements. Good agreement was also obtained between model and research plot yields of alfalfa, corn, spring wheat, dry beans and potatoes. The field research was conducted during 1980-1982 to evaluate the influence of water availability on crop yields at three sites: Kimberly, Idaho; Kaysville and Logan, Utah. The range of water availability was accomplished with a linesource sprinkler system. A universal yield function calibration for transferability among sites was not obtained. However, site calibration was useful in evaluating crop yield response to different irrigation schedules.

Subject Headings: Irrigation | Crops | Scheduling | Soil water | Site investigation | Calibration | Data processing | Weather forecasting | North America | United States | Utah | Idaho

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