Abstract: By using distilled water, ethanol, and acetone as extraction agents, the parsley seed extracts were obtained to approach whether the extracts had allelopathy on Fusarium oxysporium f. sp. cucumeris and the intensity of the allelopathy with the help of growth rate method. All the three kinds of the extracts did have allelopathic effect on F. oxysporium f. sp. cucumeris, and the effect increased with increasing concentration of the extracts. After treated with the highest concentration 50 mg·ml^-1 of the extracts for 144 h, the growth rate of F. oxysporium f. sp. cucumeris was decreased by 31.1%, 49.6%, and 57.5% for the distilled water, ethanol, and acetone extracts, respectively, suggesting that ethanol and acetone extracts had stronger allelopathic effect than distilled water extract.

Key words: Constructed wetland, Municipal wastewater, Cyperus alternifolius, Purification efficiency