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Strawberry plants (Fragaria • annanasa D. cv Chandler) were grown in field plots and in drainage lysimeters under controlled soil moisture regimes, Four irrigation treatments were established by watering the plants when soil water potential reached -0.01, -0.03, -0.05 and -0.07 MPa. The maximum yield was attained at -0.01 MPa soil water potential. Differences in yield were caused by both changes in the number of fruits per plant and in the fresh weight per fruit. Yield reductions were associated with reductions in total assimilation rate resulting from the decreased assimilatory surface area in plants irrigated at lower soil water potentials. The crop water production function calculated on a fruit fresh weight basis resulted in a yield response factor (Ky) of 1.01.vation: excessive exploitation of groundwater for agricultural purposes allows the intrusion of sea water and leaching of fertilizers which contaminate the aquifers (Corominas and Custodio 1982).Crop-water production functions are useful for irrigation scheduling, estimation of water requirements for maximum yield, determination of maximum water use efficiency, allocation of water on a farm and regional level and as an aid to economic analyses (Stewart et al. 1977).The aims of this study were to determine a) the effects of irrigation regimes on yield and water use efficiency and b) the water production function for fruit yield in response to transpiration that results from different irrigation regimes.