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Effect of Covering Methods with Ventilating Non-Woven Fabric on the Growth and Yield in Leaf Lettuce during Low Temperature Season  

안종길 (밀양대학교 원예학과)
최영환 (밀양대학교 원예학과)
Publication Information
Journal of Bio-Environment Control / v.11, no.2, 2002 , pp. 88-92 More about this Journal
Abstract
The study was conducted to estimate stimulation of plant growth of blue and red leaf lettuce (Lactuca sativa L.) as affected by covering methods with vinyl materials containing concentrated PO film. Plants were grown in direct, direct and tunnel, and tunnel covering with 'Pasraido materials' from October 13 to 31. With the covering mean air temperature, soil temperature, leaf temperature and relative humidity remarkedly increased. Higher temperature was observed in the order of direct and tunnel, direct, tunnel covering and the control. Photosynthetic photon flux (PPF, $\mu$mol m$^{-2}$ . s$^{-1}$ ) was observed in reverse order of temperature. Concentration of $CO_2$ was higher during night than during day under the light. Accumulation of highest $CO_2$ at night was obtained from direct coverings followed by direct and tunnel, tunnel covering and the control. Plant height, leaf number and leaf area of blue and red lettuces were stimulated by direct covering. However, there was no significant difference.
Keywords
covering materials; soil temperature; relative humidity; plant growth;
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