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http://dx.doi.org/10.12791/KSBEC.2016.25.3.168

Effect of the Exposed Length of Dwarf Rootstock M.9 on Growth and Yield of 'Seohong', 'Summer Dream' and 'Honggeum' Apples  

Kwon, Young Soon (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA)
Kwon, Soon-Il (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA)
Kim, Jeong-Hee (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA)
Publication Information
Journal of Bio-Environment Control / v.25, no.3, 2016 , pp. 168-172 More about this Journal
Abstract
The effect of different exposed length of M.9 rootstock on growth and yield was tested in the new apple cultivars. The 'Seohong', 'Summer Dream', and 'Hongguem' grafted on M.9 rootstock were planted in March 2010. The trees were planted in such a way that the exposed length of the rootstock to be 10, 20 and 30 cm. The result showed that as decreasing exposure length, TCA of 'Seohong', 'Summer Dream', and 'Hongguem' was increased between $3^{rd}$ and $6^{th}$ year after planting. The TCA of 20 cm and 30 cm exposure length showed respectively 70% and 60% in 'Seohong', 88% and 66% in 'Summer Dream', and 55% and 41% in 'Hongguem' of the TCA with 10 cm exposure length on 6-year-old trees. Tree height, canopy width, shoot length and terminal shoot length were also increased according to decreased exposure length in 6-year-old trees. The cumulative yield of three cultivars was higher in the tree with a lower exposure length between $4^{th}$ and $6^{th}$ year after planting. The cumulative yield of 20 cm and 30 cm exposure length showed respectively 77% and 63% in 'Seohong', 85% and 76% in 'Summer Dream', and 73% and 58% in 'Hongguem' of the cumulative yield with 10 cm exposure length in 6-year-old trees. Considering tree growth and yield, the optimum exposure length of M.9 was 10 cm for 'Seohong', 'Summer Dream' and 'Hongguem'.
Keywords
dwarf rootstock; new apple cultivar; TCA; yield;
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