Study on the cutting propagation technique ofPicea koraiensis

The cutting propagation technique ofPicea koraiensis was carried under automatic spraying of total sunlight by adopting the same year epicormic branches from different trees with different age treated by different hormones in different concentration and time and the orthogonal and randomized block was designed. The results were as follows: (l)The rooting rate of the cutting reached at least 87 percent, when the cuttings were from the seed tree with the age below 25 years old and the cuts of the cuttings base were in vertical angle and on the fine sand medium. (2) The sequence of effective factors affecting the rooting rate were the style of cut, the age of seed tree and the type of medium. (3) There are significant differences of rooting rate among different clones.