ジフェニルエーテル系除草剤 Bifbnox (Methyl 5-(2,4-Dichlorophenoxy)-2-nitrobenzoate) の土壌中における分解

DOI NDLデジタルコレクション 日本農学文献記事索引 Web Site 被引用文献1件
  • 大山 広志
    Central Research Laboratories, Hokko Chemical Industry Co., Ltd.
  • 鍬塚 昭三
    Laboratory of Soil Science, Faculty of Agriculture, Nagoya University

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タイトル別名
  • Degradation of Bifenox, a biphenyl Ether Herbicide, Methyl 5-(2, 4-Dichlorophenoxy)-2-Nitrobenzoate, in Soils

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The degradation of bifenox, a diphenyl ether herbicide, methyl 5-(2, 4-dichlorophenoxy)-2-nitrobenzoate, in 3 arable soils collected from paddy fields and a subsoil from forest was studied under flooded and upland moisture conditions in the laboratory using 14C-bifenox labeled at the nitrophenyl ring. A great difference in the degradation pattern was observed between upland and flooded conditions, but the differences among the soils were small. In paddy soils under flooded conditions, bifenox was degraded rapidly and the half life period was within 4 days when the chemical was applied at 10ppm level. Three major degradation products, the free acid and the amino derivatives of the ester and free acid forms; and 5 minor products, the acetyl- and formyl-amino derivatives of the ester and free acid forms and the salicylic acid derivative were identified. In non-flooded paddy soils, bifenox was also degraded rapidly and the half life was about 6 days. The free acid of bifenox was the main degradation product and the amino derivatives were hardly detected. In the flooded sub-soil which contained a trace amount of organic matter, the degradation was similar to those in non-flooded paddy soils.

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