External greenhouse mobile shading: effect on microclimate, water use efficiency and yield of a tomato crop grown under different salinity levels of the nutrient solution.

Book Title: NA
Year Published: 2003
Month Published: NA
Author: Lorenzo, P. ; Sánchez-Guerrero, M. C. ; Medrano, E. ; García, M. L. ; Caparrós, I. ; Giménez, M.
Book Group Author: NA
Abstract:

An evaluation of greenhouse climate, potential transpiration, water and radiation use efficiency (WUE and RUE, respectively) and yield of a tomato crop (cv. Boludo) was conducted in a greenhouse equipped with an external mobile shade screen compared with a reference greenhouse, in a study conducted at Almería, Spain, in 2002. These parameters were determined under 2 different salinity levels of the nutrient solution, i.e. 3.1 and 5.1 dS/m EC. The use of a mobile shade screen improved the greenhouse climate with regard to vapour pressure deficit and air temperature. This improvement was associated with a 36.4% reduction of the total incident global radiation during the cropping cycle. No significant effect of shading on the marketable yield was found with either the high or low EC treatment. The effect of salinity on marketable yield was, however, significant in both shaded and control treatments. The marketable yield under the shaded, low EC treatment was significantly higher (12.1 kg/m2) than that obtained for the shaded high EC treatment (8.7 kg/m2); figures for the control greenhouse were similar (11.1 and 8.7 kg/m2, respectively). The incidence of blossom-end rot was markedly lower in the shaded treatment under both EC levels. The total water uptake of the crop in the shaded greenhouse was 32% lower than that in the control greenhouse. The WUE in terms of marketable fruits was 19.3 and 28.6 g/litre under saline conditions in the control and shaded treatments, respectively. The low EC treatments showed WUE of 23 and 37.2 g/litre in the control and shaded greenhouse, respectively. The shaded treatment increased the RUE from 0.8 g/mol in the control treatment to 1.1 g/mol. The results suggest that the use of the external mobile shade screen during the spring-summer growing season increased the WUE and RUE and improved the quality of tomato fruits, irrigated with the 2 salinity levels.

Pages: 181 - 186
URL: http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=lah&AN=20033157130&site=ehost-live
Volume: NA
Number: 609
Journal: Acta Horticulturae
Journal ISO: NA
Organization: NA
Publisher: NA
ISBN: NA
ISSN: 0567-7572
DOI: NA
Keywords:

air temperature, blossom-end rot, crop quality, crop yield,fruits, greenhouses, microclimate, plant disorders, plant waterrelations, protected cultivation, relative humidity, salinity, shading,solar radiation, thermal screens, tomatoes, transpiration, water uptake,water use efficiency, Spain, Lycopersicon esculentum, Lycopersicon,Solanaceae, Solanales, dicotyledons, angiosperms, Spermatophyta, plants,eukaryotes, Southern Europe, Europe, Mediterranean Region, DevelopedCountries, European Union Countries, OECD Countries, cultivation underglass or plastic, glasshouses, sunlight, Horticultural Crops (FF003)(New March 2000), Plant Water Relations (FF062), Plant Production(FF100), Plant Disorders and Injuries (Not caused directly by Organisms)(FF700), Farm and Horticultural Structures (NN300), Meteorology andClimate (PP500), Crop Produce (QQ050), Food Composition and Quality(QQ500)

Source: EBSCO
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