[Objective] To discuss the effect of boron fertilizer sprayed on the leaf on the nutritional quality of purple sweet potato. [Method]Taking purple sweet potato 18 as material,the effects of anthocyanin,soluble protein,vitamin C,soluble sugar and boron contents of purple sweet potato were studied by spraying leaves with 2 mg / g H3BO3.[Result]The contents of anthocyanin,soluble protein,vitamin C and soluble sugar in purple sweet potato firstly increased and then decreased with the increase of boron fertilize...