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Irrigation scheduling in a high-density olive orchard from estimated stomatal conductance

AuthorsHernández Santana, V. ; Fernández Luque, José Enrique ; Díaz-Espejo, Antonio
KeywordsRegulated deficit irrigation
Fruit yield
Virgin olive oil
Issue Date2019
PublisherInternational Society for Horticultural Science
CitationActa Horticulturae (1253): 499-456 (2019)
AbstractStomatal conductance (gs) is one of the possible good plant-based indicator, because it reflects finely the level of water stress and photosynthesis limitations. We conducted an experiment to schedule a regulated deficit irrigation (RDI) strategy for high density olive orchards, using modeled gs (summer 2017, Spain). We had three treatments with four replicated plots: two control treatments, one of them irrigated with the Kc method (100CKc) and the other one from the estimation of gs as a function of air vapor pressure deficit (D) and radiation (100Cgs). We also had one RDI treatment (45RDI), in which 45% only of the water supplied to the 100Cgs treatment was applied. Stomatal conductance modeled for 100Cgs was compared to gs estimated using sap flow measurements. We found a good correlation between gs estimated with the two methods (R2=0.9, p<0.0001). The total water supply in 100Cgs (3722.6 m3 ha¿1) was lower than in 100CKc (4103.2 m3 ha¿1), with no effect (p>0.05) either on the trees water status (average predawn leaf water potential was -0.67 MPa in 100Cgs) or in fruit yield (12633±3448 and 13290±1256 kg ha¿1 in 100Cgs and 100CKc, respectively). Yield in 45RDI was significantly reduced (7399.7±276 kg ha¿1) as it was the estimated gs, which decreased around 30% in relation to 100Cgs. We conclude that it is possible to schedule irrigation in olive from automated estimations of gs. This estimation model and further supplement and related research might be opens the possibility for determining targeted levels of stress as a function of gs.
Description8 páginas.- 4 figuras.- Artículo del la comunicación oral presentada en el XXX International Horticultural Congress IHC2018: International Symposium on Water and Nutrient Relations and Management of Horticultural Crops
Publisher version (URL)http://dx.doi.org/10.17660/ActaHortic.2019.1253.59
Appears in Collections:(IRNAS) Artículos
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