ISHS Acta Horticulturae 659: VII International Symposium on Protected Cultivation in Mild Winter Climates: Production, Pest Management and Global Competition
INFLUENCE OF GREENHOUSE ROOF OPENING SYSTEM ON INTERNAL CLIMATE AND LIMONIUM YIELD CONTROL |
| Authors: | G. Fascella, G.V. Zizzo |
| Keywords: | protected culture, microclimatic conditions, vent typology, Plumbago family, Misty series, growing technique |
| Abstract:
A study on five two-span greenhouses with different roof opening systems, with natural or forced ventilation, in the presence of a Limonium cultivation was conducted in order to evaluate the effect of vent typology on internal climate and crop response. A one-year trial was conducted in Bagheria (Sicily, Italy) with two cultivars of hybrid Limonium of the Misty series (Misty White and Misty Blue). Data on internal climate were collected by a system of sensors connected to a logger, analysed with a platform software and compared with the external values. Roof vent typology moderately affected air temperature and relative humidity. More sensible thermic reductions during the warmest days were recorded both in the greenhouse with gull-wing vents and equipped with 2 head-ventilators and in the structure with total roof opening by complete removal of the plastic film cover. Roof opening system did not significantly influence yield but only the qualitative parameters of production. The two above-mentioned environments had the longest (96 and 86 cm, respectively) and the heaviest (34 and 35 g) stems. Tested cultivars did not differ in stem quality. ‘Misty White’ produced a higher amount of flowers than ‘Misty Blue’ (26, 4 and 16, 7 stems/plant, respectively). | |
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