To improve the productivity of rooted cuttings in pine wilt disease-resistant Pinus thunbergii, the effect of cutting size on rooting ability and first year growth was studied. Sprouts collected as cuttings from four genetically different clones were assigned to various size combinations (five or six classes by diameter and four by length). One year after insertion, rooting percentages and height of rooted cuttings were measured and GLMM and LMM analyses applied to assess the effect of cutting size. Small diameter cuttings showed high rooting ability and lesser height, whereas large diameter cuttings showed low rooting ability and greater height. Therefore, results suggest there is an optimum intermediate diameter to maximise the productivity of rooted cuttings. Longer cuttings showed greater height but cutting length did not affect rooting ability. Rooting ability and first year growth differed among clones, suggesting that the optimum diameter for high productivity differs among clones, and highlighting the importance of selecting suitable clones to improve productivity.

为了提高扦插的生产力松材线虫病抗性黑松，研究了cutting割尺寸对生根能力和第一年生长的影响。从四个遗传上不同的克隆作为插条收集的新芽被分配到各种大小的组合中（直径分为五或六类，长度分为四类）。插入一年后，测量生根插条的生根百分比和高度，并应用GLMM和LMM分析来评估切屑尺寸的影响。小直径的插条显示高生根能力和较小的高度，而大直径的插条显示低生根能力和较大的高度。因此，结果表明存在一个最佳的中间直径，以使生根钻屑的生产率最大化。较长的插条显示出较高的高度，但插条的长度不会影响生根能力。克隆的生根能力和第一年生长情况有所不同，