Inquiry into survival rate of Carya cathayensis seedlings in grafting

Key words: 
• Carya cathayensis /
• grafting plant /
• survival rate /
• technical measures

Abstract: Survival rate kept under 41 % in Carya cathayensis as stock when scion of bearing tree were used in grafting , then it could reach 90 % ～ 93 %with branch of nursery stock as scion , but all no practical value . Although it obtained 84 %～ 88 %with scion of bearing tree in Platycarya strobilacea as stock , the preservative rate was lower and between stocks and scions were in compatible .The analysis indicated that survival rate of grafting would be caused by thing cambium , large pith and high tannin contents , but not leading factor .With age of stock plant and ramification series of scion increased , it were main reasons that the vital force of scion be declined , the essential endogenous hormone contents of callus formation be decreased and the speed and the amount of callus be retarded , which resulted in descending survival rate .So in the light of above-mentioned problems, in order to enhance vigor of scion and improve coalescent surroundings , the methods about strengthening regeneration pruning , circumcising on stock plant , raising seedlings with large shed and dealing with scion in hormones in grafting were be used , then to raise survival rate of grafting .