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Lookup NU author(s): Dr James Taylor
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Stomatal conductance (gs) is a plant variable normally used in models that estimate plant water requirements, and furthermore can be used as an integrative tool to monitoring the level of plant water restriction. However, gs requires skills and heavy devices, which drastically limit the number of replications either in space or in time. Moreover, due to the significant spatial variability in olive orchards, extrapolation of one measurement on a whole field or on a whole orchard scale can hardly be done. The aim of this paper is to propose a model that uses only one measurement performed on a reference site in order to predict gs and its spatial variability over the whole field. An experiment to identify and test the model was carried out over a commercial drip-irrigated olive orchard (Olea europaea L. ‘Arbequina’) located in Pencahue valley, Maule Region, Chile (35°23’LS; 71°44’LW; WGS 84; 96 m a.s.l.). Measurements of gs were done in 29 dates using a porometer (PP Systems, PMR-5, Amesbury, Massachusetts, USA) during three growing seasons (2008-09, 2009-10, 2010-11). A regular grid of 30 measurement sites was distributed over the field. Results showed a significant within-field variability of gs over space and time, and the existence of significant linear relations among gs values. Also, the model was able to predict spatial variability of gs with a spatial and temporal mean error of 53.3 and 52.0 mmol m-2 s-1, respectively. Further studies will aim to confirm the relevancy of this approach for different cultivars and locations
Author(s): Acevedo-Opazo C, López-Olivari R, Jara-Rojas F, Valdés-Gómez H, Figueri Q, Taylor JA
Publication type: Book Chapter
Publication status: Published
Book Title: Acta Horticulturae 1057: Proceedings of the Seventh International Symposium on Olive Growing
Year: 2014
Volume: 1
Pages: 357-362
Print publication date: 30/10/2014
Publisher: ISHS
Place Published: Leuven, Belgium
URL: http://www.actahort.org/books/1057/1057_42.htm
Library holdings: Search Newcastle University Library for this item
ISBN: 9789462610477