Shading effects on greenhouse microclimate and crop transpiration in a cucumber crop grown under mediterranean conditions

dc.contributor.author	Kitta, E	en
dc.contributor.author	Katsoulas, N	en
dc.contributor.author	Savvas, D	en
dc.date.accessioned	2014-06-06T06:52:05Z
dc.date.available	2014-06-06T06:52:05Z
dc.date.issued	2012	en
dc.identifier.issn	08838542	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/5832
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84859714176&partnerID=40&md5=f39160cbec494bf98a98b234113596c1	en
dc.subject	Air temperature	en
dc.subject	Energy balance	en
dc.subject	Shade net	en
dc.subject	Solar radiation	en
dc.subject.other	Air temperature	en
dc.subject.other	Climatic parameters	en
dc.subject.other	Crop growth	en
dc.subject.other	Crop production	en
dc.subject.other	Crop transpirations	en
dc.subject.other	Greenhouse air	en
dc.subject.other	Greenhouse microclimate	en
dc.subject.other	Growing season	en
dc.subject.other	Shade net	en
dc.subject.other	Shading effect	en
dc.subject.other	Shading intensity	en
dc.subject.other	Vapor pressure deficit	en
dc.subject.other	Atmospheric temperature	en
dc.subject.other	Cultivation	en
dc.subject.other	Energy balance	en
dc.subject.other	Greenhouse effect	en
dc.subject.other	Greenhouses	en
dc.subject.other	Solar radiation	en
dc.subject.other	Sun	en
dc.subject.other	Crops	en
dc.subject.other	Cucumis sativus	en
dc.title	Shading effects on greenhouse microclimate and crop transpiration in a cucumber crop grown under mediterranean conditions	en
heal.type	journalArticle	en
heal.publicationDate	2012	en
heal.abstract	The aim of this study was to investigate the effects of greenhouse shading on greenhouse microclimate and energy balance, and on crop production. Experiments were carried out in the experimental farm of the University of Thessaly at Velestino, in three similar, plastic-covered greenhouses using hydroponically-grown cucumbers as a test crop. One of the greenhouses was used as a control (without shading); the other two were shaded using two different shade nets (shading intensity of approximately 35% and 50%, respectively). Climatic parameters were measured during two growing seasons from April to June and from September to November 2008 and seven selected days of the above periods are presented. The results showed that shading could not keep greenhouse air temperature and vapor pressure deficit below 30°C and 1.5 kPa, respectively, values that are considered acceptable for cucumber crop growth (Growers Books, 1980; Bakker et al., 1987; Olympios and Hanan, 1992). From the crop production data it was found that shading intensity should not exceed 35%. The analysis of greenhouse microclimate and energy balance showed that shading is necessary from the middle of spring, while even shading of approximately 50% was not sufficient to cool the greenhouse during noon time of summer days in Central Greece and that an additional cooling system was required. © 2012 American Society of Agricultural and Biological Engineers.	en
heal.journalName	Applied Engineering in Agriculture	en
dc.identifier.issue	1	en
dc.identifier.volume	28	en
dc.identifier.spage	129	en
dc.identifier.epage	140	en