Crop Irrigation Requirement Model for Utah

by L. Niel Allen, Utah State Univ, Logan, UT, USA,
Robert W. Hill, Utah State Univ, Logan, UT, USA,



Document Type: Proceeding Paper

Part of: Planning Now for Irrigation and Drainage in the 21st Century

Abstract:

Crop irrigation requirements vary greatly across Utah's wide range of climatic conditions. About 40 electronic weather stations have been established in areas representing most of Utah's irrigated crop land. With this weather data reference evapotranspiration has been calculated using either a modified Penman or calibrated M.E. Jensen-H.R. Haise equation for each region. The crop irrigation requirement model contains historical precipitation and a polynomial equation approximating reference evapotranspiration for each region. Crop coefficient equations along with typical planting, effective cover and harvest dates for each region and crop are also included. Irrigation requirements can be calculated for user selected regions and crops. The program results compare reasonably well with field measured crop water use. This program runs on an IBM PC or compatible and is publicly available.

Subject Headings: Crops | Irrigation | Computer models | Evapotranspiration | Water use | Water resources | Computer aided operations | Utah | United States

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