Abstract
Crop-water production functions (CWPFs) constitute a suitable tool for irrigation management in water-scarcity situations, and for estimating the yield response when a crop is subjected to long-term water stress. This work examines the long-term effects of different strategies of sustained deficit irrigation in mature sweet orange trees (Citrus sinensis L. Osb. cv. Salustiana). The trial was conducted from 2004 to 2010, with three deficit treatments imposed as a function of the water-stress index, which is defined as the ratio between the actual volume of water supply and the crop evapotranspiration rate. Crop-water production functions were evaluated for each year. Additionally, different yield-loss functions were defined on the basis of the impact of deficit irrigation for the entire study period. According to the findings, the crop response to water stress followed a clear trend over successive years, in which the time course of the yield loss showed an attenuated oscillation. Thus, the calculated yield-loss functions could be provided as an alternative tool for programming a long-term strategy of deficit irrigation under a water-scarcity situation.
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