Effects of Different Treatments on Softwood Cutting Survival and Rooting of Osmanthus fragrans

In order to explore the best propagation mode of Osmanthus fragrans cutting, improve the cutting survival and rooting rate of perennial mother trees, the new semi-lignified branches with strong growth and no diseases and insect pests were used as test materials, the effects of different kinds of plant growth regulators（naphthalene acetic acid（NAA）, indole butyric acid（IBA）） and concentrations（100, 200 mg/L）, treatment methods（water immersion treatment, ethanol solution quick dip treatment, talcum powder treatment） and cutting substrates on the survival roots of cuttings of O. fragrans were compared and analyzed. The results showed that the survival rate of O. fragrans cuttings under 200 mg/L NAA water immersion treatment was the highest, up to 80.89%. The rooting rate, mean root number and mean root length were 73.37%, 9.47 pieces/plant and 9.0 cm respectively, which were increased by 560.99%, 84.60% and 162.39% compared with the control group. The comparison of different cutting substrates showed that perlite was the best, followed by river sand, and 1 yellow subsoil+2 vermiculite or pure vermiculite was poor. The best combination of cutting propagation of new branches of O. fragrans was to take perlite as the matrix and soak in 200 mg/L NAA for 2 hours.