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dc.contributor.authorCuevas Sánchez, Mª Victoria-
dc.contributor.authorTorres Ruiz, José Manuel-
dc.contributor.authorÁlvarez Garrido, Rafael-
dc.contributor.authorJiménez Ruz, Mª Dolores-
dc.contributor.authorCueva Salas, Juan-
dc.contributor.authorFernández Luque, José Enrique-
dc.identifier.citationAgricultural Water Management 97 (9): 1293-1302 (2010)es_ES
dc.description10 pages, 7 figures, 1 table, 55 references.es_ES
dc.description.abstractPlant age and size, seasonal growth patters and crop load, among other factors, have been reported to decrease the usefulness of trunk diameter variation (TDV) derived indices as water stress indicators in olive trees. Our hypothesis, however, is that indices derived from TDV records in old, big olive trees are sensitive enough to detect levels of water stress in trees of orchards under deficit irrigation that, although severe, are below the threshold for fruit shrivelling. This is of importance for the production of good quality oils, since fruit shrivelling may affect oil quality. The aim of this work was to assess different TDVderived indices as water stress indicators in 40-year-old ‘Manzanilla’ olive trees with heavy crop load. We derived the maximum daily shrinkage (MDS), daily growth (DG) and daily recovery (DR) from TDV records taken during the 2008 dry season both in well-irrigated FAO trees and in deficit-irrigated RI trees. Measurements of volumetric soil water content ( v), leaf water potential ( l), stomatal conductance (gs), net CO2 assimilation rate (A), water and oil accumulation in the fruits and yield parameters were made for both treatments. The trunks did not grow during the experimental season, either in the FAO or RI trees, likely because of the heavy crop load. Therefore, DG was useless as water stress indicator. For MDS and DR, which were responsive to the increase of the trees’ water stress, we calculated the variability, quantified by the coefficient of variation (CV), the signal intensity (SI) and the sensitivity (SI/CV) values. In addition, we derived reference equations for irrigation scheduling from the relationships between MDS values in the FAO trees and main meteorological variables. Values both of SI-MDS and SI-DR were steady until September 9, despite of increasing differences in v between treatments from early in the dry season. The l vs v values showed an outstanding capacity of the RI trees to take up water from the drying soil, and the l vs gs values showed a near-isohydric behaviour of those deficit-irrigated trees. These results explain, at least in part, the lack of response of MDS and DR on that period. Both SI-MDS and SI-DR peaked for the first time on September 9, 16 days before the appearance of fruit shrivelling. Our results suggest that using TDV-derived indices as water stress indicators for irrigation scheduling in old olive orchards with medium to low plant densities, i.e. with large root zones, may be useless in case the irrigation strategy is aimed at keeping the soil close to field capacity. Nevertheless, the MDS and DR indices may be useful indicators for the avoidance of fruit shrivelling in deficit irrigated olive orchards for the production of good quality oil. Reliable reference equations for scheduling irrigation with the signal intensity approach were obtained from the regression of MDS values vs the daily maximum values of both the air temperature and the vapour pressure deficit of the air.es_ES
dc.description.sponsorshipThe ECOSAT project, to which this work belongs, is funded by Verdtech Nuevo Campo S.A., Agencia de Innovación y Desarrollo de Andalucía (IDEA), Corporación Tecnológica de Andalucía (CTA), Fundación Caja Rural del Sur and WWF/Adena. Both the IDEA and CTA belongs to the Consejería de Innovación, Ciencia y Empresa of the Junta de Andalucía.es_ES
dc.subjectPlant-based water stress indicatores_ES
dc.subjectSignal intensityes_ES
dc.subjectWater savinges_ES
dc.subjectDeficit irrigationes_ES
dc.subjectOlea europaeaes_ES
dc.titleAssessment of trunk diameter variation derived indices as water stress indicators in mature olive treeses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderJunta de Andalucía-
dc.contributor.funderVerdtech Nuevo Campo-
dc.contributor.funderFundación Caja Rural del Sur-
dc.contributor.funderWorld Wildlife Fund-
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