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我省油桐主要是‘三年桐’品种。‘三年桐’具有结果早、产量高的优点,但盛果期较短。据调查,二十年生以上的老桐树,一般单株产籽量只及盛果期桐树产量的十分之一。老桐树树冠大,若按占地面积比较,产量悬殊更大。各地现有桐林资源中尚有不少老桐树,亟待复壮更新,恢复其盛果期的产量,因此,改造老桐树是尽快提高桐籽产量的一项重要措施。一、修剪和更新。对不结果或结果少,但主干没有虫蛀的老桐树,可进行强修剪。在冬季将离主干五十厘米以外的主枝上的二、三级分枝全部砍去。砍时注意切口向下,平滑,最好还应在切口上抹一层石止灰浆防雨水和病菌侵入。来年萌发的新枝,每主枝只保留二至四个生长匀称而健
Tung oil in our province is mainly ’three Tong’ varieties. ’Three years Tong’ has the result of early, high yield advantages, but full fruit is shorter. According to the survey, more than 20-year-old old Tung tree, seed yield per plant and only one-tenth of the total fruiting period. Old tung tree crown big, if according to the area of comparison, the output gap is even greater. There are still many old Tung trees in the existing resources in Tonglin, which are urgently needed to be rejuvenated and restored to their full yield period. Therefore, the transformation of the old Tung tree is an important measure to increase the production of Tong seed as soon as possible. First, trim and update. For no result or result less, but the trunk is not moth-eaten old tung, can be strong pruning. In the winter will be fifty centimeters away from the trunk of the main branches of the second and third branches all cut off. Cutting attention down incision down, smooth, it is best to also cut a layer of stone mortar wipe rain and germs invasion. The next year, the new sprouting branches, each branch only retain two to four well-balanced growth and health