Study on Rooting Characteristics of Hardwood Cutting of Tetraena mongolica Maxim.

The purpose of the study was to investigate the rooting characteristics of the hardwood cuttings of Tetraena mongolica Maxim.from aspects of length and ages of cuttings,external hormone concentration,leaf retention,cutting orientations and cutting positions.The results indicated that the rooting ratio of two or three years old of cuttings was larger than the more than four years old of cuttings.The influence of external hormone concentration on rooting was obvious;the rooting ratio of the hardwoods was increased by external hormone treatment,especially when treated by ABT1 at 50 mg\5L-1 with 3 hours,the rooting ratio reached 91%.Leaf retention influenced rooting significantly;the rooting rate of the cuttings became larger as the leaf retention increased.There were no differences in rooting capability between south and north cutting orientation in the ortets.The rooting ratios of the cuttings made of the upper part of the shoot were significantly larger than those made of the middle and the base of the shoot.Callus began to appear and a few cuttings began to root in 3 days after cutting.Most cuttings were all healed in 6 days after cutting.Higher rooting period occurred in 7 to 10 days after cutting.