Regulation Of Tree On Flowering And Fruiting Of Swida Wilsoniana

Swida wilsoniana is a widely distributed woody oil plant, which has high fruit yield with high oil content. In recent years, biofuels who environmental friendly and renewable green energy was attracted more and more attentions all over the world as oil depletion and prices inflationas. As an important raw material of biodiesel feedstocks, high yield varieties and cultivation techniques were needed to improved. In order to improve yield,3-year old grafted plants were studied by different artifical wound and pruning methods. The main results showed as follows:1Swida wilsoniana's growth had different influences by the methods of girdling with barkwrapper up-down, binding stem with stranded wire, binding stem with rope and stem girthcutting on plants and flowering. Binding stem with stranded wire controlled the high growth and enhanced the diameter growth of cornus tree more strongly compared with the other3method. Also the method promoted obviously blooming, the rate of blooming trees was83%, which was significant different from that of treated with the other methods. Meanwhile, the number of flowers from per tree was678, which accounted for58.2%of the total flowers from all the treated trees. However, there was little difference between binding trunk and binding bough to promote flowering. All these methods destructed sieves of bark, and then prevented organic matter transporting from leaves to root, thus inhibited the high growth and promoted the increase of tree trunk, enhanced early blooming and fruiting.2Binding stem with stranded wire has different effects at different time on tree growth and flowering. Binding stems inhibition of high growth most strongly in July, which and diameter of stem base was increased, and control compared to significant difference (different was significant at0.05level).There was no difference in north crowm and south crown among different treating time. However, the effects of different binding time on the number of flowering trees and per tree flowers were quite different (different was significant at0.01level).Particularly, trees were binded starting in July had the most flowers per tree, up to384flowers per tree averagely, which was34.9times of that of control trees.3Different tree shapes resulted in different flowering and fruiting. Based on location conditions of planting places, different methods were taken to prun and tender grafted Cornus trees, and then3kinds of high yield tree form and pruning methods.(1) Natural open heart tree form, it was characteristiced by strong branch axis, low crown, open center, powerful light and ventilation, early fruiting, which was suitable for most varieties planted at slope or plain areas;(2) Backbone stratified layer tree form, its traits were multi-layer stratified, relatively high tree body, main stem and collateral branches distribution formed well, good light and ventilation, high yield.This kind of tree shape applied to the fertile plains, wide planting spacing.(3) Multi-main branch of happy-shaped tree from, which was characteristiced with many main branches separated at large angle, small crown, forming fast, good ventilation and light, early fruiting, which was convenient to manage, and it was more adapt to high density of high-yield planting.All the three types of tree form were common in good tree body structure for improving ventilation and light, then to enhance photosynthesis, promote early flowering, increase production, and it was easy to tender and manage.