Grape fruit quality was improved by spraying leaves with 0.5% KH2PO4 at two week intervals during the development of ' Jingyou' ( Vitis vinifera L.x V. labrusca L.) berries. The results showed that the content of reducing sugar and soluble solid content increased, polar diameter and eguatorial diameter and fresh weight of fruit were longer than control, and tartaric acid decreased in berries mature period. The reason of content of reducing sugar increment was that the treatment of 0.5%,1% NaH2PO...