In this paper, the researching progress of allelopathy in agro-ecosystem was briefly overviewed on base of many studies. It reviewed researching actuality and evolvement of allelopathy, including allelochemicals, the factors of allelopathy, mechanism of allelopathy. Enumerated many separating means of allelochemicals and the widely used bioassay methods, and pointed out that mechanism of allelopathy is a weak segment. And the further research in this field are discussed.
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