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Abstract In a field experiment,effects of three plant growth substances，Diethyl aminoethyl hexanoate(DTA-
6),Uniconazole(S3307)and SOD mimics(SODM)were studied on potato yield,quality and its root physiology through foliar
application at potato tuber expansion period.The results showed that compared to the control,SODM, DTA-6 and S3307
increased yield by 17.4 %,8.3 %,and 4.1 % respectively.SODM could increase the contents of starch,water-soluble
protein and sucrose.S3307 could increase the content of water-soluble protein.Three plant growth substances could
decrease the content of reduced sugar.The experiment draw the conclusion that three plant growth substances could
improve the quality,yield and activity of root metabolism,but SODM treatment had the best effect.
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