Effect Of Aqueous Extracts And Residues Decomposition Of Mikania Micrantha H.B.K.On Selected Crops

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Department of Botany Aligarh Muslim University

Laboratory and greenhouse experiments were conducted to determine the effects of aqueous extract and different periods of decomposition of Mikania micrantha H.B.K. residues on the germination and growth of cucumber (Cucumis sativus L.) and Chinese cabbage (Brassica chinensis L.) . Germination, radicle length and fresh weight of the two '(12.5, 25 and 50 g/l) of aqueous leaf or root extract of mikania. The phytotoxic effect of root extract on the germination and growth of both test crops was greater than of leaf extract. The fresh weight and the rate of emergence of the twobioassay species decreased with an increase of Mikania residues (leaf or root residues). The emergence of both species was greatly reduced when Mikania debris (root or leaf) was incorporated into the soil after two weeks of decomposition. Fresh weight of cucumber seedlings was considerably reduced by exposure to root debris at both 1 and 2 weeks of decomposition, whereas that of Chinese cabbase was reduced only when exposed to debris after 2 weeks of decomposition. In general, root decomposed for 2 weeks or longer caused more reduction in fresh weight of both test species than did leaf.

Key words: Allelopathy, aqueous leaf extract, chinese cabbage, cucumber. debris. Mikania micrantha, root extract.