Fruit Quality of Zizyphus ju jubeM ill. cv.‘Dongzao’Influenced by Differen t Kinds of Fertilizer

In order to imp rove the quality of‘Dongzao’jujube, the trees were fertilized by amino acid fertilizer,mineral fertilizer and rare earth fertilizer during fruit development. The experiment showed that all the fertilizer treatments could imp rove transverse growth, single fruit weight and total sugar content of fruit, the mineral fertilizertreatment was the best. The fast increasing period of total sugar contentwas 70～90 days after blossom, and disaccharide was the main composition of the sugar. The quantity of fructose and glucose were fast increased during 90～110 days after blossom, amino acid fertilizer and rare earth fertilizer were effective for imp roving this two kinds ofsugars. Both amino acid fertilizer and rare earth fertilizer could increase Vc content of‘Dongzao’jujube fruit, whilerare earth fertilizer treatment decreased it. Pericarp of‘Dongzao’jujube fruit nourished bymineral fertilizer and amino acid fertilizerwere thinner than by rare earth fertilizer. The conclusion of this experimentwas that the effectiveness of three fertilizers to imp rove the fruit quality is mineral fertilizer better than amino acid fertilizer better thanrare earth fertilizer.