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http://dx.doi.org/10.12791/KSBEC.2014.23.4.349

Influences of Tunnel Covering Materials and Seeding Dates on the Growth and Productivity of Water Spinach (Ipomoea aquatic F.) under Unheated Greenhouse  

Uhm, Mi Jeong (Department of Horticultural Industry, Jeollabuk-do Agricultural Research and Extension Services)
Kwon, Sung Whan (Department of Horticultural Industry, Jeollabuk-do Agricultural Research and Extension Services)
Song, Young Ju (Department of Horticultural Industry, Jeollabuk-do Agricultural Research and Extension Services)
Publication Information
Journal of Bio-Environment Control / v.23, no.4, 2014 , pp. 349-355 More about this Journal
Abstract
This study was performed to evaluate influences of tunnel covering materials and seeding dates on the growth and productivity of water spinach (Ipomoea aquatic F.) cultured early in unheated greenhouse. During tunnel installation period, from March 5 to April 30 and from October 11 to November 10, air and soil temperature in tunnel covered with polyethylene film (PEF) had risen $2.0-2.4^{\circ}C$ and $0.9-1.0^{\circ}C$, respectively, compared to those in non-tunnel (NT). Air and soil temperature in tunnel with illite non-fabric (INF) also had risen $1.6-1.8^{\circ}C$ and $0.6-0.8^{\circ}C$, respectively. Especially, it showed greater effects of the rise at low temperature time zones of the day. In plots of seeding on March 15 in tunnel covered with PEF or INF, temperature during emergence period, emergence days and rate were similar to plot seeding on April 5 in NT. There were two more harvesting in plots of seeding on March 5 or March 15 in tunnel, and increasing of total yield by 22.5-25.7% compared to plot of seeding on April 5 in NT. But there was observed no significant differences between PEF and INF. Whereas PEF was necessary to be removed at midday sometimes because it had risk of high temperature injury, INF was not necessary. All above suggest that it was suitable to sow seed on the middle of March in tunnel covered with INF, for early culture of water spinach in unheated greenhouse.
Keywords
early culture; illite non-fabric; polyethylene film; seeding date;
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