Abstract: ‘Fuji’(Malus domestica Borkh.) was used as the material in the experiment. The treatment of experiment was spraying leaves with 0.2% H₃BO₃at different developing stage of‘Fuji’ fruit. The contents of calcium and boron could be improved by treatment, that indicated boron could be freely transported by phloem and improved the content of calcium. By the short effect of treatment on boron absorbing, the treatment order was follow, the young fruit stage > the rapid growing phase of the fruit > ripening phase. But the effect of treatment on the ripening phase of fruit, the order was the rapid growing phase of the fruit > ripening phase > the young fruit stage. The contents of boron and calcium of cell wall in fruit could be improved by treatment. The absolute contents of different boron forms in fruit were enhanced by spraying leaves with H₃BO₃. There are three boron forms that were water soluble boron, semibound boron and bound boron. The development of fruit proportion of water soluble boron and semibound boron was higher, on the contrary, proportion of bound boron is lower.

Key words: Apple, Boron, Calcium