| Sumario: | The objective of the present study was to determine the Regulated Deficit Irrigation
(RDI) effect on the cv. Frantoio olive tree, under semiarid mediterranean weather
condtions (8 months dry period). The trial was established in the “El Oliveto" farm
(33°48' S, 71°05' W) Cholqui, Melipilla, Metropolitan Region, Chile, and considered
five irrigation treatments: 100% of crop evapotranspiration (ETc) (T1), 85% ETc
(T2), 75% ETc (T3), 70% ETc (T4), and 65% ETc (T5) applied between February
(endocarp lignification) to May (harvest) of 2011. Periodic plant measurements were
conducted, which included physiological parameters (midday stem water potential,
photosynthesis and stomatal conductance) and production indices (mean fruit weight,
maturity index and total production). The results obtained indicate that to a less
irrigation water, the water potential, the stomatal conductance and the photosynthesis
are decreased when compared to the 100% ETc. As others have quoted, it was also
noticed that the less irrigation water had no effect on yield and fruit oil content.
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