Abstract: Potato is the fourth largest food crop in the world and thus possesses high economic value. Potato tubers are an important part of the research on potato breeding and reproduction,which is of significance on the research and application of potato. In order to explore the effects of gibberellin（GA）and butyryl hydrazine（B9）on the growth and development of potato tubers,different concentrations of GA and B9 were used for orthogonal experiment. Based on the statistics results of potato plant height,lateral shoots,leaves,tubers' number,and tuber starch content,the effects of adding both GA and B9 on the growth and development were significant,and especially significantly greater than that of adding GA or B9 alone on the number and quality of potato tubers. Moreover,the addition of 0.5 mg/L GA and 20-40 mg/L B9 medium contributed to the formation of potatoes with large leaves,stalks,tuber number and tuber starch content.

Key words: potato tubers, gibberellin（GA）, butyryl hydrazine B9