Abstract: In ordre to explore the allelopathy effect of Panax notoginseng root exudates under different nitrogen levels， the present study using Panax notoginseng seedlings and wheat plants as donor and receptor plants， respectively， was carried out. The results showed that Panax notoginseng root exudates exhibited inhibitory effect on wheat (M3=-004). Compared with seedling growth， seed germination was more likely to be inhibited by the allelopathy effect of Panax notoginseng root exudates. With increased N level， the inhibitory effect on germination index increased in the order of excess N > normal N > deficient N. The shoot growth of wheat seedling was enhanced by allelopathy effect of Panax notoginseng root exudates， while the root growth was inhibited. Besides， it was noticed that the allelopathy effect of Panax notoginseng root exudates on wheat was related to the nitrogen level in solution．

Key words: Panax notoginseng, root exudates, allelopathy, nitrogen levels, wheat