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Effects of Pruning Treatments on Growth and Yield of Juvenile Clone Plantations of Camellia oleifera

XIAO Qing1,LI Jiyuan 2,LI Jinming1,LI Xinlei2,LU Yizeng2 (1.Xinyu Popularization Station of Forestry Science and Technology,Xinyu City Forestry Bureau, Xinyu Jiangxi 338000,China; 2.Reserach Institute of Subtropical Forestry,CAF,Fuyang Zhejiang 311400,China)  
The pruning trials were established in the two juvenile plantations of Camellia oleifera located in the Xinyu City of the central Jiangxi Province in the winter of 2004.The results showed that there were significant or very significant differences for length of spring shoots,quantity of fresh shoot and fruit yield,but no significant differences for the total length of shoots,diameter of fresh shoots and quantity of flower buds after pruning treatment to the plantation with good growth.Although significant effects were not found for the length and diameter of the spring shoots among clones,but significant differences for the quantity of spring shoots,flower buds and fruit yield among these clones.The enhancing effects on growth were found for the clone Yalin No.4 and Yalin No.56,but negative effects for clone Yalin No.27 after the pruning treatment.The quantity of spring shoots for clone Yalin No.4 and Yalin No.56 increased by 87.20% and 6.47%,respectively,but for clone Yalin No.27 was less than 49.33%,compared with the control.The fruit yield for clone Yalin No.4 and Yalin No.56 increased by 153.72% and 5.49%,separately,but for clone Yalin No.27 was less than 44.39%,compared with the control treatment.The restraining effects of the heavy pruning treatment on growth were found for the juvenile plantation with medium growth.Therefore,the clone and its growth potential should be considered while pruned.
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