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Allelopathic effect of parthenium (Parthenium hysterophorus L.) extract and residue on some agronomic crops and weeds

Allelopathic effects of entire shoot extract, plant part extracts, and shoot residue of parthenium (Parthenium hysterophorus L.) on corn (Zea mays L.), ryegrass (Lolium multiflorum Lam.), wheat (Triticum aestivum L.), velvetleaf (Abutilon theophrasti Medik.), and soybean [Glycine max (L) Merr.] growth were examined. Parthenium shoot contained water-soluble materials that were toxic to root growth of velvetleaf and wheat. At 4% (w/ v) concentration, root growth of velvetleaf and wheat were reduced by 60 and 75%, respectively. The order of increasing sensitivity to parthenium was ryegrass, corn, wheat, and velvetleaf. There was a strong correlation between extract concentration and increased toxicity to test species. The toxicity of plant part extracts was also concentration dependent. At 1 and 2% (w/v), the inflorescence and leaves caused more root inhibition than stem extract. Parthenium shoot incorporated in soil at 1% (w/w) caused significantly more root inhibition of wheat than soybean, corn, and ryegrass. At 4% (w/w), root growth of all the test species was inhibited compared to the control. Toxicity of parthenium residue to wheat diminished with increasing periods of decomposition. Residue decomposed for four weeks was less toxic than the undecomposed residue.

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1. Institute of Food and Agricultural Sciences Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, 33850, Lake Alfred, Florida

   Wondimagegnehu Mersie & Megh Singh

1. Wondimagegnehu Mersie
2. Megh Singh

Florida Agricultural Experiment Stations Journal Series No. 7506.

Mersie, W., Singh, M. Allelopathic effect of parthenium (Parthenium hysterophorus L.) extract and residue on some agronomic crops and weeds. J Chem Ecol 13, 1739–1747 (1987). https://doi.org/10.1007/BF00980214

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• Received: 08 August 1986

• Accepted: 21 October 1986

• Issue Date: July 1987

• DOI: https://doi.org/10.1007/BF00980214

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