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S0: susceptible goosegrass seedlings without paraquat; SQ: susceptible goosegrass seedlings for mixed samples sprayed paraquat 40 min, 60 min and 80 min; R0: resistant goosegrass seedlings without paraquat; RQ: resistant goosegrass seedlings for mixed samples sprayed paraquat 40 min, 60 min and 80 min.
