美丽胡枝子的扦插繁殖试验研究

目的]探究美丽胡枝子的快速育苗技术。方法]以美丽胡枝子当年生嫩枝和1～2年生老枝为插穗进行扦插试验，研究不同插穗类型对插穗生根率的影响以及不同激素处理对嫩枝扦插生根质量的影响。结果]采用当年生嫩枝木质化程度稍低的中部和木质化程度稍高的基部作插穗时，其生根率分别为32．40％和9．26％，而老枝的生根率为0；采用浓度分别为200、500和800mg／L的生根粉1号和NAA2种激素处理的试验表明，生根粉1号和NAA均可提高扦插生根率，且随处理液浓度的升高生根率逐渐提高，其中以浓度为800mg／L的生根粉l号处理效果最好，其生根率达46．3％，比对照提高42．86％。结论]美丽胡枝子的扦插宜采用当年生的嫩枝作插穗，用植物激素进行处理插穗可提高生根质量。

Study on the Cutting Propagation Experiment on Lespedeza formosa

Objective] The aim was to explore the rapid seedling raising technology of Lespedeza formosa.Method] With the same-year-old twigs and 1-2-year old branches of L.formosa as cuttings for cutting experiment,the effects of different cutting sorts on rooting rate of cutting and different hormone treatments on rooting quality of twig cutting were studied.Result] When the middle part of the same year-old twig with lower lignification and basal part with higher lignification were chosen as cuttings,their rooting rate was 32.40% and 9.26% resp. whereas that of the older branch was 0.The tests of adopting two hormone treatments of the rooting powder No.1 and NAA with concn.of 200,500 and 800 mg/L resp.showed that the rooting powder No.1 and NAA all could increase cutting rooting rate,and raised gradually with the increase of treatment liquor concn.,in which the rooting powder No.1 with concn.of 800 mg/L got the best treatment result,with rooting rate up to 46.3%,being 42.86% higher than that of control one.Conclusion] It's suitable to adopt the same-year-old twigs as the cutting of L.formosa,gand rooting quality could be improved by using plant hormone for treatment.