In hard wood cutting trial of Tilia amurensis adopted Nk 3 and NK 3 treatments,the results show that rooting rate of cuttings has attained 87 7% and 86 0% separatly.

• 在紫椴硬枝扦插育苗时 ,利用NK4 、NK3进行处理 ,其生根率分别达到 87 7%25、 86 0%25。