Effects of Soil Injection Amounts of Ethyl Alcohol on Sugar Content in Peach by Controlling Nitrogen
2013
Kim, I.J., Chungcheongbukdo Agricultural Research and Extension Services, Gagog-gil, Republi of Korea | Kwon, U.S., Chungcheongbukdo Agricultural Research and Extension Services, Gagog-gil, Republi of Korea | Lee, S.H., Chungcheongbukdo Agricultural Research and Extension Services, Gagog-gil, Republi of Korea | Lee, K.Y., Chungcheongbukdo Agricultural Research and Extension Services, Gagog-gil, Republi of Korea
The objective of this study was to determine the optimum injection amount of ethyl alcohol as a carbon source which was intended to increase sugar content in fruit by controlling nitrogen. The tested variety was Changhowon Hwangdo which were 12-year-old trees. Twentyfold diluted solution 5 l, 10 l, 20 l, and 40 l of ethyl alcohol (95%) per a tree were injected into rooting zone at Eumseong county in 2012. We supplied ethyl alcohol at Aug. 7 when it was 12 days before first harvest. Nitrate content of soil severly got lower than control after injecting ethyl alcohol in about 3 days. Lower nitrate contents of soil lasted for 12 to 29 days as affected by injection amounts of ethyl alcohol. Nitrogen content of leaves was seen to have a same tendency to the nitrate content of soil. Biomass C contents and dehydrogenase activities were increased by increasing of injection amounts of ethyl alcohol. Fruit weight was reduced at twenty fold diluted solution 40 l of ethyl alcohol (95%), while sugar content was increased at twenty fold diluted solution 20 l of ethyl alcohol (95%). In conclusion, it was possible that twenty fold diluted solution 20 l of ethyl alcohol (95%) at 12 days before first harvest improved the cultural method to maintain fruit weight as well as to increase sugar content.
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