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Effects of Plant Growth Regulators for Hard Wood and Cutting Time for Soft Wood on Rooting of Korean Native Spiraea spp.  

Lee, Jeong Ho (Korea National College of Agriculture and Fisheries)
Song, Cheon Young (Korea Forest Seed & Variety Center)
Woo, Hyo Jin (Korea National College of Agriculture and Fisheries)
Kwon, Oh Woung (Korea National College of Agriculture and Fisheries)
Publication Information
FLOWER RESEARCH JOURNAL / v.19, no.2, 2011 , pp. 103-109 More about this Journal
Abstract
This study was conducted to develop mass production method by proper cutting time, and the concentrations of plant growth regulators of Spiraea spp. Plants of hard wood was cut on March 3th, the rooting rate in S. salicifolia and S. cantoniensis was 11.3% comparatively higher than that about 5% in S. trichocarpa, S. miyabei, S. japonica, S. thunbergii and S. fritschiana. The rooting of control was 6.0%, however the $125{\sim}1,000mg{\cdot}L^{-1}$ IBA or NAA for 3 hour soaking was above 15.0% in the S. salicifolia. Therefore soaking in $125mg{\cdot}L^{-1}$ of IBA or NAA solution was recommended before cutting. The proper cutting time for soft wood from May 7 to September 17 in S. trichocarpa, S. cantoniensis, S. prunifolia, and S. thunbergii was September 17 when the soft stem was changed hard and the temperate was proper for rooting, high and low, $25{\pm}3^{\circ}C$ and $18{\pm}3^{\circ}C$. The rooting of September 17 was above 70% in S. salicifolia and S. fritschiana. However, the rooting from middle of May to early August was low below 20% in all the genus of Spiraea.
Keywords
IBA; NAA; propagation; rooting rate;
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