为了果树生产获得早期丰产,高密度栽植在美国日趋普遍.但栽植材料费用太大是一个限制因素,因此注意到以低成本生产大量苗木的研究工作.组织培养虽有优点,但技术较复杂而且设备费用大.最廉价的方法就是用枝条进行扦插.试验的第一种方法是半硬材扦插,插条在8月1日前后当顶芽已形 For fruit trees to gain early yield, high-density planting is increasingly common in the United States, but planting materials is a limiting factor and therefore noting the research efforts to produce large quantities of seedlings at low cost. Tissue culture has advantages but the technology is complex and Equipment costs. The cheapest way is to cut with branches. The first method of testing is a semi-hardwood cutting, cuttings in the August 1 when the top bud has been shaped