Experiment on Planting in Groups with Populus × xiaohei cv‘Chifeng’

The experiment on planting in groups with Populus×xiaohei Huang etLiang cv. ‘Chifeng' has been completed in Jianping County, Liaoning Province in l985～1989.The results show that the application of planting in groups in intensive-managed poplar cultivation can increase the timber production up to 34.4%～112.8%,the net production value up to 62.6%～208.5% as compared with the control. And in comparision with the con-ventional method of planting in the same density,it can prolong the time of intercropping for 1～2 years. Among the 3 treatments 3 trees/group is the best, its ratio of economic effectscan reach 8.40,as 4 and 2 trees/group only 7.6 and 6.84 respectively.