Abstract:

A dwarf, close planting,and early bearing ginkgo forest of 111.30 hm²,which radiates an area of 459.06 hm²,has been established with the improved ginkgo cultivars of Dafoshou, Damaling,and Huakoudabaiguo in north of Guangxi Autonomous Region. By popularization and application in large area,the aim of first bearing after 3～5 years and being put into production after 6～8 years have been schieved. Total output of ginkgo seeds for demonstration forest and radiated forest was 1 422 200 kg,and the output value was 22 755 000 yuan RMB. During the implementation of the project,by conventional fertilization,in comparison with the control,the average number of new shoots per plant increased 310%,the length of new shoots increased 113%,and the optput per plant increased 174%;by prescription fertilization,the average output per plant increased 125%,the eatable part of the seeds increased 15%;by artificial fruit thinning,the average number of new shoots per plant increased 311%,the length of new shoots increased 115%,the suspension rate of seeds in water was merely 1%.while that was 86.4% in control. For the ginkgo demonstration forest grown for 7～8 years, in comparison with the conventional cultivars,the average output per plant of Huakoudabaiguo increased 420%,Dafoshou increased 200%,and Damaling increased 300%～400%.The demonstration of this project solved the problems of ginkgo production, such as late bearing,scattered planting,and low economic benefit.

Key words: Ginkgo biloba, improved cultivars, early bearing techniques, application