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核桃属异花授粉树种,实生繁殖后代变异显著,据调查,在一个园里,同为十年生核桃树,少数单株可结果35个,多数只结几个果,还有未结果单株.我省现有核桃树2809万株,年产核桃于果1100万斤,真正结果大树约550万株,平均株产2个.还有2200多万株幼林和未挂果的中龄林,约占总数80%.有的单株不仅产量低,而且经济性状差,如不改造直接影响农民经济收益.试验证明,嫁接繁殖其
Walnut species of cross-pollination, reproductive progeny significant variation, according to the survey, in a garden, with the same ten-year-old walnut trees, a few can be the result of 35 plants, most only bear a few fruit, as well as the results of single plant. There are 28.09 million walnut trees in our province with an annual output of 11 million kilos of walnuts, and the actual result is about 5.5 million trees with an average of 2. There are more than 2200000 young and non-fruiting middle-aged forests, about Accounting for 80% of the total number of some plants not only low yield, but poor economic performance, if not directly affect the economic impact of farmers income.Experimental results show that the graft