Simulation Model for Evapotranspiration of Wheat: Empirical Approach

by Daniel Shimshi, Irrigation Scientist; Inst. of Soils and Water, Agricultural Research Organization, Bet Dagan, Israel,
Gad Strateener, Research Assoc.; Hebrew Univ., Jerusalem, Israel, and Center for Agricultural Economic Research, Rehovot, Israel,
Mordechai Weisbrod, Research Assoc.; Hebrew Univ., Jerusalem, Israel, and Center for Agricultural Economic Research, Rehovot, Israel,
Eshel Bresler, Soil Physicist; Inst. of Soils and Water, Agricultural Research Organization, Bet Dagan, Israel,
Dan Yaron, Prof. of Agricultural Economics; Hebrew Univ., Jerusalem, Israel, and Center for Agricultural Economic Research, Rehovot, Israel,


Serial Information: Journal of the Irrigation and Drainage Division, 1975, Vol. 101, Issue 1, Pg. 1-12


Document Type: Journal Paper

Abstract: A simulation model is described for predicting the changes in the soil-water content of the root zone of wheat growing under various irrigation regimes in a semi-arid region. The model is based on the following assumptions: (1) Irrigation water and rainwater infiltrates from the soil surface, wetting each successive soil layer as the overlying one is wetted in excess of the field capacity (as conventionally defined); and (2) the rate of water loss from the soil in which the parameters change with time and with depth of soil. Parameters a and b were determined empirically from soil moisture data collected from a series of wheat irrigation experiments carried out over a 4-yr period in northern Negev, Israel. The average relative deviation between computed and observed values of soil moisture ranged from 8.8% to 13.5%. The changes in parameters a and b reflect the development of the root system in the soil profile and the changes in time of canopy cover and evaporation conditions.

Subject Headings: Soil water | Crops | Simulation models | Irrigation | Evapotranspiration | Empirical equations | Soil loss | Parameters (statistics) | Hydrologic models | Vegetation | Israel | Middle East

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