乌桕(棬子)在我国已有悠久的栽培历史,劳动人民有丰富的栽培经验。早在三百年前《农政全书》即记有“臼不须种,野生者甚多,若收子即佳种,种出者亦不中用,必须接博乃可。未接者江、浙人呼为‘草臼种’”。可见那时早有嫁接繁殖乌桕的经验了。近年来,我们在荣县、屏山两县进行调查,目前乌桕生产基本上是用天然下种 Wuyi (prickly heat) in our country has a long history of cultivation, working people have rich experience in cultivation. As early as three hundred years ago, “The Complete Works of the Peasants and Peasants,” that is recorded as “mortar do not need species, many wild, if the income is good seed, the seeds are not used, you must take Bo Nai Ke. , Zhejiang call ”grass mortar species". At that time, we can see that we had the experience of grafting and breeding clams. In recent years, we investigate in Rongxian and Pingshan counties. At present,