殺菌剤ゲアザチンの土壌中における挙動

DOI NDLデジタルコレクション 日本農学文献記事索引 Web Site Web Site 被引用文献1件

書誌事項

タイトル別名
  • Fate and Behavior of Fungicide Guazatine in Soils
  • 殺菌剤グアザチンの土壌中における挙動〔英文〕
  • サッキンザイ グアザチン ノ ドジョウチュウ ニ オケル キョドウ エイブン

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The degradation of a fungicide guazatine-triacetate (TA) was investigated in three agricultural soils (Kumagaya clay loam, Chiba loam, and Nagaoka clay loam) under upland or flooded conditions using two types of the 14C-labeled fungicide. When 14C-guazatine-TA was added to the soils, the fungicide was immediately and strongly adsorbed to soil particles to become resistant against microbial attack irrespective of soil types and incubation conditions. Consequently, the fungicide degraded extremely slowly and radioactive carbon dioxide was formed to a limited extent (1-5% of applied 14C). Since the loss of 14CO2 appeared to be an essential factor for the disappearance of radiocarbon from the soils, the radiocarbon persisted for a long time period in all cases (half-life of 14C≥3.5 years). No degradation product was detected from all the soil extracts, and it seemed that almost all of the radiocarbon persisted in the soils was attributable to the presence of the intact fungicide. Investigations on the adsorption of 14C-guazatine from aqueous solution to Kumagaya and Chiba soils indicated that guazatine had high affinity for both soils, and in diluted solution the fungicide was completely adsorbed to soil particles (or no measurable amount of 14C-guazatine was contained in the solution). The quantity of guazatine held in this strong adsorption region was approximately 10mmol/kg for both soils, and this value was 1000 times greater than the burden of soil when guazatine was applied to the field at a normal recommended rate. The adsorption isotherms determined with or without hydrogen peroxide treatment and 14C-distribution among humic materials showed that 14C-guazatine was preferentially held in the soil inorganic fraction.

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