除草剤ピラゾキシフェンの分解速度と土壌要因との関係

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  • 有田 浩之
    Laboratory of Soil Science, Faculty of Agriculture, Nagoya University Visiting researcher from Central Research Institute, Ishihara Sangyo Kaisha, Ltd.
  • 鍬塚 昭三
    Laboratory of Soil Science, Faculty of Agriculture, Nagoya University

書誌事項

タイトル別名
  • Relationships between the Degradation Rate of the Herbicide Pyrazoxyfen and Soil Properties
  • 除草剤ピラゾキシフェンの分解速度と土壌要因との関係〔英文〕
  • ジョソウザイ ピラゾキシフェン ノ ブンカイ ソクド ト ドジョウ ヨウイン
  • Studies on the Metabolism of Pyrazoxyfen (Part 1)

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抄録

Relationships between the degradation rate of the herbicide pyrazoxyfen (2-[4-(2, 4-dichlorobenzoyl)-1, 3-dimethylpyrazol-5-yloxy]-acetophenone) and soil properties were investigated. In the experiment, pyrazol-3-14C-labeled and unlabeled pyrazoxyfens were incubated in five paddy soils under flooded and upland conditions. The degradation rate of pyrazoxyfen differed greatly according to the properties and conditions of soils. Pyrazoxyfen tended to degrade rapidly in mineral soils and slowly in humic volcanic ash soils with its half-life being 3-5 and 5-34 days, respectively. In the same soil, the degradation was faster under flooded conditions (half-life of less than 10 days) than under upland moisture conditions (half-life of 4-34 days). Under all the experimental conditions the degradation rate was negatively correlated with the cation-exchange capacity and the organic-matter content of a soil. The correlation was also negative with the C/N ratio and the maximum water holding capacity, but the correlation coefficient differed according to experimental conditions.

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