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http://dx.doi.org/10.7732/kjpr.2014.27.2.188

Sap Outflow Characteristics of Walnut Tree (Juglans sinensis Dode)  

Kim, Chul-Woo (Division of Special-purpose Trees, Department of Forest Genetic Resources, Korea Forest Research Institute)
Kim, Mahn-Jo (Division of Special-purpose Trees, Department of Forest Genetic Resources, Korea Forest Research Institute)
Park, Youngki (Division of Special-purpose Trees, Department of Forest Genetic Resources, Korea Forest Research Institute)
Publication Information
Korean Journal of Plant Resources / v.27, no.2, 2014 , pp. 188-193 More about this Journal
Abstract
The sap outflow characteristics of Juglans sinensis and J. mandshurica were investigated to evaluate the optimum pruning period of walnut tree that there is a sap spill on dormant. The total period of sap outflow were 34 days for both J. sinensis and J. mandshurica. Total amount of sap outflow per tree in J. sinensis and J. mandshurica were 2,922 mL/tree and 3,135 mL/tree, respectively and the period of sap outflow and non sap outflow between two species were similar. ANOVA analysis showed that the amount of sap outflow was significant differences with day of sap outflow but there were no significant differences between species. From the correlation analysis between air-temperature and sap outflow, daily minimum temperature showed a positive correlation at the 1% level of significance (r=0.56 and r=0.46) for both J. sinensis and J. mandshurica. When branch of walnut tree that diameter is 5 cm cut on the period of sap outflow, the sap flowed down the longest period (48 days) but the sap outflow was not observed after budburst. Therefore, our study supported that the pruning have to avoid the period of sap outflow to reduce sap outflow of walnut tree.
Keywords
Dormant; Budburst; Correlation; Temperature; Branch;
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Times Cited By KSCI : 8  (Citation Analysis)
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