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ISHS Acta Horticulturae 889: VI International Symposium on Irrigation of Horticultural Crops

ESTIMATION OF WATER REQUIREMENTS OF 'THOMPSON SEEDLESS' TRAINED ON AN OVERHEAD TRELLISED SYSTEM USING AN EDDY COVARIANCE METHOD IN THE ACONCAGUA VALLEY, CHILE

Authors:   G. Selles, R. Ferreyra, C. Aspillaga, S. Ortega-Farias, P. Villagra, V. García de Cortázar
Keywords:   evapotranspiration, crop coefficient, energy balance, FAO Penman-Monteith, table grape
DOI:   10.17660/ActaHortic.2011.889.14
Abstract:
During the 2008-2009 season, net radiation (Rn) and soil heat flux (G), sensible heat flux (H) and latent heat flux (LE=λ ETc where ETc is vine evapotranspiration and λ is the latent heat of vaporization) were measured on a drip-irrigated ‘Thompson Seedless’ vineyard trained on an overhead trellised system (“parronal español”). The experiment was located in Calle Larga, Aconcagua valley, Chile (32°52’40’’ S, 70°37’45’’ O, 795 m a.s.l.). LE and H were obtained from an eddy covariance system. The reference evapotranspiration (ETo) was calculated using the FAO-Penman-Monteith model. Results indicated that the closure (ratio of LE+H to Rn-G) was 0.91 in November ‘08 and 0.82 in January ‘09. At flowering (74% solar interception), the mean ratios of LE, H and G to Rn were 0.53, 0.26 and 0.11, respectively. At veraison (98% solar interception) LE, H and G were 0.81, 0.01 and 0.1 of Rn respectively. Also, an increase of crop coefficient (Kc = ETc/ETo) values from October to mid-November was observed. Afterwards, it was almost stable until mid-January when an increase was again observed. A maximum Kc value of 1.3 was reached at veraison.

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