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Effect of Covering Method of Ventilating Non-Woven Fabric and $\textrm{GA}_3$ Treatment on the Growth and Yield of Leaf Lettuce during Low Temperature Season  

최영환 (밀양대학교 원예학과)
손병구 (밀양대학교 원예학과)
강점순 (밀양대학교 원예학과)
안종길 (밀양대학교 원예학과)
Publication Information
Journal of Bio-Environment Control / v.12, no.2, 2003 , pp. 72-76 More about this Journal
Abstract
This study was conducted to estimate stimulation of plant growth of green and red leafy lettuces (Lactuca sutiva L. cv. Chungchima and Jugchima) at affected by covering method and time with protected film materials containing concentrated PO film and GA$_3$ foliar spray. Plants were covered with ‘Pasraido’ material from October 26 to November 31 (direct 1), from November 5 to November 31 (direct 2), or with a tunnel, or direct 2＋ tunnel. Mean air temperature and relative humidity under the covering were higher in direct and tunnel, direct and non-covering, in that order. The fresh weight and dry weight of red and green lettuces increased in direct and tunnel followed by direct 1, direct 2, tunnel and the control. GA$_3$ treatment promoted the growth in all covering methods, but decreased the chlorophyll contents. Fresh weight and dry weight were higher in red lettuce than in green lettuce in the control.
Keywords
covering method; $\textrm{GA}_3$; temperature; relative humidity; plant growth;
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