千年桐雌雄异株,用实生苗造林雄株占半数以上。结果雌株中也往往良莠不一,产量差异悬殊。因此,多数学株和单位面积产量较低。为加速发展千年桐生产,增加桐油产量,近年来产区群众积极选择优树,培育优树嫁接苗用于造林。优树嫁接苗的培育,目前多数采用大苗嫁接的方法,即早春育砧次春嫁接,嫁接当年冬季或翌年春季出圃造林,群众称之为二年生嫁接苗。培育二年生嫁接苗不仅用期长,土地利 Millennium Tong dioecious male plantation with seedlings accounted for more than half. The results of female plants are often mixed, yield disparity. Therefore, most strains and yield per unit area is low. In order to speed up the development of millet Tong and increase the production of tung oil, in recent years, the masses in the producing areas have actively chosen the best tree and cultivated the excellent grafted seedlings for afforestation. Tree grafting seedling cultivation, the current method of grafting using the majority of the seedlings, that is, early spring grafting anvil grafting, grafting the winter or the following spring out of nursery afforestation, the masses called the biennial grafted seedlings. Grafted nursery grafting is not only a long period of use, land and profits