IDENTIFIKASI SENYAWA FENOL EKSTRAK AKAR RIMPANG ALANG-ALANG (Imperata cylindrtca (L.) Beauv) DAN UJI POTENSI ALELOPATINYA TERHADAP PERKECAMBAHAN GULMA,Ageratum conyzoides (L.) DAN Amaranthus spinosus (L.)(Identification or Phenotic substances of alang-alang (Imperata cylindrica (1") Beauv')Ageratum conyzoides (f,.) and Amaranthus spinosus (L.) weeds)

Ardi , Ardi and Fitriani, Fitriani and Agustini, Dwitia (2010) IDENTIFIKASI SENYAWA FENOL EKSTRAK AKAR RIMPANG ALANG-ALANG (Imperata cylindrtca (L.) Beauv) DAN UJI POTENSI ALELOPATINYA TERHADAP PERKECAMBAHAN GULMA,Ageratum conyzoides (L.) DAN Amaranthus spinosus (L.)(Identification or Phenotic substances of alang-alang (Imperata cylindrica (1") Beauv')Ageratum conyzoides (f,.) and Amaranthus spinosus (L.) weeds). Stigma, VII (2). ISSN 0853-3776

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Abstract

An experiment to identify the phenolic substances of rhizome of alang-alang (Imperata cylindrica (L.) Beaurr and it's allelopathic potential on the germination of Ageraturn conyzoides (L.) and Amaranthus spinosus (L.) weeds was conducted at the laboratory of Department of Chemistry Faculty of Mathematics and Natural Sciences and the laboratory of Department of Agronomy Faculty of Agriculture Andalas University during the period of July to October 1998. Phenolic substances of extract of alang-alang rhizome was identify using Thin Layer Chromatography. Mixture of six phenolic substances identified i.e. coumaric acid, anisic acid, isoverulic acid, salisilic acid, vanilin, and salisil aldehide, at the concentration of 0, 50 ppm, 100 ppm, 200 ppm, 400 ppm, and 800 ppm as treatrnents were applied to seeds of Ageratum tonyioidr,s and Amaranthus spinosas. Treatments were arranged in Complete Randomized Design with five replications. Data were collected on germination percentage and index value, and final data were analyzed statistically. Result inclicated that extract of alang-alang rhizome contained phenolic substances such as coumaric acid, anisic acid, isoverulic acid, salisilic acid, vanilin, and salisil aldehide. The mixture of those phenolic substances at the concentration of 800 ppm supressed the germination of Ageratum conyzoides and Amaranthus spinosus.

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