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SUITABILITY OF GREENHOUSE BUILDING TYPES AND ROOF COVER MATERIALS FOR GROWTH OF EXPORT TOMATOES IN THE BESOR REGION OF ISRAEL : I. EFFECT ON CLIMATIC CONDITIONS

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概要 Growth conditions in a narrow bay, low roof Dutch greenhouse (Venlo type) and in a wide bay, high roof Israeli greenhouse (Sharsheret type), were studied. Roof-cover materials that were tested in the ...Israeli greenhouses included glass, polyethylene, corrugated fiberglass and tabular polycarbonate. The differences in climatic conditions between the greenhouses were usually small and without a specific trend. Day temperatures in all building types were 1-6℃ higher than the values measured outdoors simultaneously. During most of the season, excessively high temperatures could be avoided by opening ventilation windows. In the Dutch greenhouse, day temperature control was rather limited. Night temperatures in all greenhouses were usually higher by 1℃ or less than the outside temperature. In the polycarbonate-covered greenhouse, night temperatures were higher. Radiation inside the greenhouses was about 55%-60% of the outside level. In the polycarbonate-covered greenhouse, radiation levels were about 10% lower than the others. The photosynthetically active fraction of global radiation was higher inside the greenhouses than outside.続きを見る

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登録日 2009.04.22
更新日 2015.11.09