Abstract:

A pilot demonstration project has been conducted in order to improve the traditional cultivation methods of Toona sinensis. The three-year project studied on techniques of compact planting of Toona sinensis in open field, time and angle of pinching, pruning and branch shearing. The experiment result showed that Toona sinensis grew better with row spacing of 1.5 m×1 m and plant density about 6750 tree/hm2. Young and health tree should be pinching and pruning from early June to late July, small and weak tree should be pruning and shearing in early June. Stumping should be conducted on late June or in spring before stem sap flow and germinating. Limb and perennial, health branch groups should be shearing in late May, main branch should be pulling to 80o, and young tree’s annual branch should be pulling to 90o form the middle of August to early September of the third or forth year. This research took the lead to innovate the branch pulling direction and angel by combine the technique of shearing and pulling. This new dwarfing and compact planting technique increased Toona sinensis yield by 30% per hm2 in 3 years.