Study on Sprout-promoting Technology for Sympodial Bamboo Sub-branch Cuttings-garden

A trial has been laid out,which is by the same orthogonal design with 3 factors including keeping the height of mother offset,treating the buds on its culm base and applying with BA+NAA of various concentration,and 3 levels in three different location for searching the proper establishment and management technology on promoting sub branches from adventitious buds,the best propagating materials in the field,of Dendrocalamopsis oldhami(Nanping City), Bambusa multiplex(Fuyang City)and Bambusa textilis(Guangzhou City)in their cuttings-garden.The results showed that the proper technology for establishing cuttings-garden is(1)keeping the mother offsets with 7 internodes after chopping their top,(2)damaging all buds on its culm base and(3)applying 5 times of MS nutrient solution with BA+NAA of various concentration according to the species i.e.2 mg BA+1 mg NAA per liter for D. oldhami, 10 mg BA +1 mg NAA per liter for B. multiplex, 5 mg BA +1 mg NAA per liter for B. textilis,from mid April to mid-August,and its dosage is l liter·clump-1 ·time-1,which can harvest 142 500,114 000,54 000 sub branches·hm-2 ·year-1 for D. oldhami,B. multiplex and B. textilis respectively.The sustainable management technology for D. oldhami is(1)during later-middle shooting stage,keeping 2 or 3 new culms per clump i.e.making the culm age structure of clump as 1 year old∶2 year old=2∶1,(2)chopping their top in next early spring and keeping the culms with 7 internode height,which will give 160 500 sub branches·hm-2 sustainablely in each year.