Abstract

IBANEZ, A.A; PARERA, C  and  TORRES, M. Efecto de la restricción hídrica invernal en olivo (Olea europaea L.): el potencial hídrico xilemático y la conductancia estomática. RIA. Rev. investig. agropecu. [online]. 2016, vol.42, n.2, pp.186-200. ISSN 1669-2314.

During the application of a winter water restriction in the seasons of 2011 and 2012, was quantified and related the water status of olive (Olea europaea L.) with soil moisture content and ambient temperature. The experiment was conducted in olive trees cv. Arbequina 10 years old in EEA San Juan INTA (San Juan, Argentina). The treatments were: T1, full irrigation with replacement of 100% of crop evapotranspiration (ETc) throughout the cycle and two treatments with water restriction (21 June to 31 August), T2, irrigated with 50% ETc and T3, no- irrigation, for the rest of the season with irrigation were 100% ETc. The stem water potential (Øtallo), stomatal conductance (gs), relative extractable water (REW) soil and the effect of ambient temperature were measured. The results demonstrated the feasibility in implementing winter water restrictions in the arid region of Argentina, with low water availability during that period. The decrease in Øtallo and gs depends on the content REW of soil and ambient temperatures. Applying a water restriction which replaces the 50% ETc, with an initial reserve of easily available water (AFA) of 40 mm, slightly affects the water status of the olive tree; while implementing a full irrigation restriction during the winter, without initial reserve of AFA, severely affects the Øtallo and gs to -6.80 MPa and 5.67 mmol/m²/s, respectively. Irrigation scheduling during the winter using Øtallo and gs must be evaluated together with the soil moisture content.

Keywords : Olea europaea L; Water relations; Deficit irrigation.

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