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KMID : 1098420050130060287
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Korean Journal of Medicinal Crop Science
2005 Volume.13 No. 6 p.287 ~ p.292
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Effects of Covering Materials on Prevention of Freeze Damage and Labor Saving in Saururus chinensis Baill During Wintering
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Nam Sang-Young
Kim In-Jae
Kim Min-Ja
Yun Tae
Lee Cheol-Hee
Park Sung-Gue
Lee Woo-Young
Kim Hong-Sig
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Abstract
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To investigate the effects of heat conservation materials on freeze damage and weed occurrence during overwintering in Saururus chinensis, Temperature difference was 6.9^{circ}C in chaff, and was lower than those ranged from 9.7 to 14.4^{circ}C in other materials. Heat conservation index, calculated from average temperatures below -10^{circ}C of earth’’s surface during the winter, was higher 1.7^{circ}C;and;1.5^{circ}C in chaff and lagging, respectively than in straw. Preservation of water is greater 9.6{sim}26.1% in covering than in open field, and it increased in the order of lagging > chaff > straw among heat conservation materials. The survival rate of rhizome was increased in the order of 99% in lagging > 75% in chaff > 58% in straw, 32% in open field after overwintering, budbreak began fast, and the numbers of total budbreak per unit area were greater 22 times in lagging than 35.0 units in open field. Weeds occurrence was decreased in covering, i.e., 12.0{sim}33.2;units/m^2,;7.3{sim}10.7;kg/10a of dry weight, and 5.6{sim}6.4;hours/10a of labor input compared with 157.2;units/m^2,;28.9;kg/10a of dry weight, and 65.7 hours/10a of labor input in open field. Growth of top part was better in covering than in open field, and the number of tillers per unit area showed 347{sim}396 compared with 293 in open field. Marketable yields of dried stem and leaves and rhizome were higher 69{sim}87%;and;58{sim}88%, respectively in covering than in open field, and among heat conservation materials, those were highest in lagging.
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KEYWORD
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medicinal crop, Saururus chinensis Baill, winter method
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