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Phytotoxic activity of the ethanol extracts and total alkaloids from seeds of S. alopecuroides tested at 0 mg/mL (CK), 0.3 mg/mL, 3 mg/mL on root and shoot elongation of A. retroflexus. Each value is the mean of three replicates ± SE (n = 30). Means with different letters (a, b, c) indicate significant differences (p < 0.05) according to Fisher’s LSD test.
