Effects of Soil Properties and Conditions on the Degradation of Three biphenyl Ether Herbicides in Flooded Soils

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  • OYAMADA Masami
    Laboratory of Soil Science, Faculty of Agriculture, Nagoya University Present address: Visiting researcher from Life Science Laboratory, Mitsui Toatsu Chemicals Inc.
  • KUWATSUKA Shozo
    Laboratory of Soil Science, Faculty of Agriculture, Nagoya University

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  • 湛水土壌中における3種のジフェニルエーテル系除草剤の分解におよぼす土壌の理化学的性質および土壌条件の影響
  • 湛水土壌中における3種のジフェニルエーテル系除草剤の分解におよぼす土壌の理化学的性質および土壌条件の影響〔英文〕
  • タンスイ ドジョウチュウ ニ オケル 3シュ ノ ジフェニルエーテルケイ ジョ

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Abstract

Degradation of diphenyl ether herbicides was studied in six soils under flooded conditions. The half-life periods largely varied depending on soil: 9 to 173 days for chlornitrofen (CNP), 3 to 87 days for nitrofen (NIP) and 8 to 64 days for chlomethoxynil, but the patterns and rates of the degradation were similar in a soil. No significant correlations were found between the degradation rates of the chemical and the physicochemical properties of the soils, while significant negative correlations were observed between the half-life periods of the chemicals and the soil redox potentials. The degradation of chlornitrofen was largely affected by the preincubation period of soil and the amendment of organic substances to soil. The herbicides were rapidly degraded at a lower redox potential of soil.

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