Abstract: In order to study the effects of different amounts of selenium on selenium content and quality of Kyoho grape,selenium fertilizer was applied with trunk injection.The results showed that the selenium content of fresh fruits,leaves and main stems was significantly increased by injecting different concentrations of selenium fertilizer into the trunk,reaching 0.035,1.466 and 1.476 mg/kg,respectively.The single fruit weight and the content of soluble solid,soluble sugar,titratable acid,VC,citric acid and malonic acid increased,and the content of titratable acid,oxalic acid and succinic acid decreased by applying selenium fertilizer with trunk injection.The most significant correlation with the amount of selenium fertilizer was oxalic acid(-0.861) and malonic acid(0.832).It illustrated that the selenium content and the quality of grape fruits were significantly improved,and the content of organic acids in the fruits were affected,especially the content of oxalic acid and malonic acid by trunk injection of selenium fertilizer.According to comprehensive analysis,the trunk injection of 50 mg/L was the best treatment.

Key words: grape, selenium, trunk injection, quality