Abstract
A study was conducted to assess the phytotoxicity of residues of Parthenium hysterophorus , an exotic invasive weed, towards the growth of three Brassica species ( Brassica campestris, Brassica oleracea and Brassica rapa ). The early growth of crops, measured in terms of seedling length and dry weight, was significantly reduced when grown in soil amended with varying amounts of Parthenium residues. A direct relationship was observed between the amount of residue incorporated in the soil and growth reduction. This adverse effect on Brassica crops indicates the presence of some growth‐retardatory substances which are possibly released by the residues into the soil medium. In order to test this, aqueous extracts (1, 2, and 4%) of residues were prepared. It was observed that, in a laboratory bioassay, these extracts severely reduced the early growth of Brassica species, thereby indicating the presence of some water‐soluble, inhibitory principles in Parthenium residues. A significant amount of the phenolics, the largest group of secondary metabolites usually implicated in allelopathy, was estimated in residue extracts, as well as in residue‐incorporated soil. The phenolic content increased with increasing residue concentration, thereby showing their direct involvement in the observed growth inhibitions. Therefore, the study establishes that Parthenium residues exert an allelopathic influence on the early growth of Brassica crops by releasing water‐soluble phenolics into the soil.
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Claims 6
Claim · model-written summary
Parthenium residues significantly reduced Brassica seedling length and dry weight.
- Treatment
- soil amended with varying amounts of Parthenium residuese0
- Interactor
- Parthenium
Partheniume0weed - Outcome
- seedling length and dry weighte0
- Direction
- reducede0
Not reportedTaxonComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling length and dry weight, was significantly reduced when grown in soil amended with varying amounts of Parthenium residues”
Claim · model-written summary
Greater residue incorporation was associated with greater growth reduction.
Not reportedTaxonDirection
Verbatim
e0“direct relationship was observed between the amount of residue incorporated in the soil and growth reduction”
Claim · model-written summary
Aqueous residue extracts severely reduced early Brassica growth.
BrassicaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these extracts severely reduced the early growth of Brassica species”
Claim · model-written summary
Phenolics were detected in residue extracts and residue amended soil.
Not reportedTaxon
Verbatim
e0“A significant amount of the phenolics, the largest group of secondary metabolites usually implicated in allelopathy, was estimated in residue extracts, as well as in residue‐incorporated soil”
Claim · model-written summary
Phenolic content rose with residue concentration.
Not reportedTaxon
Verbatim
e0“phenolic content increased with increasing residue concentration”
Claim · model-written summary
The authors attributed Brassica growth inhibition to water soluble phenolics released by Parthenium residues.
- Taxon
- Brassica cropse0
- Interactor
- PartheniumPartheniume0weed
- Compound
- water‐soluble phenolicse0
- Outcome
- early growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Parthenium residues exert an allelopathic influence on the early growth of Brassica crops by releasing water‐soluble phenolics into the soil”
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botanical · growth · BrassicaPositive and negative results
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See all 8 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.