ペンディメタリンの土壌中濃度の経時的変動と植物の生育に及ぼす影響

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Pendimethalin (N-(1-ethylpropyl)-2, 6-dinitro-3, 4-xylidine), was applied to a paddy field (paddy-uplandcrop-rotation field) in Yawara and a field in Kannondai planted to winter wheat and the concentration of the acetone soluble and the water soluble ingredients in the soil was determined. The concentrations of the water soluble ingredients of pendimethalin in soil was also determined in relation to the effect on the growth of Italian ryegrass (CV. WASEAOBA) in the soil treated with the herbicide. The results obtained are as follows; 1. The concentration of the residues of the acetone soluble ingredients of pendimethalin applied to the soil decreased with time. However, the amount of the residues after 200 days of application fluctuated in the field treated with the herbicide. The concentration of the water solubleingredients in the soil to which the herbicide had been applied (emulsifiable concentrate and fine granules) decreased so rapidly that there was a close correlation between the concentrations and the number of days after herbicide treatment (Fig. 1 and Fig. 2). 2. In the plowed soil of the Yawara field, the ratio of the concentration of the water soluble ingredients to that of the acetone soluble ingredients in the soil treated with the emulsifiable concentrate (30%, 150g a.i./10a) was 4〜8% on the day of application, about 2〜3% after 60 or 90 days and less than 2% after 90 or 120 days. In the non-plowed field, the corresponding values of the ratio were 3〜5% after 60 or 90 days of application and about 1% after 90 days. In the case of the plowed field to which fine granules of pendimethalin had been applied (2.0%, 100g a. i./10a), the values of ratio were about 2% on the day of application, 8〜10% after 30 days, 3〜5 % after 60 or 90 days, less than 2% after 120 days. The values of the ratio in the non-plowed field were 2〜3% from the day of application to 90 days after, and less than 0.5% after 120 days of application. In the soil at KANNONDAI field to which fine granules of pendimethalin had been applied (2.0%, 80g and 160g a.i./10a) the value of ratio was the highest, 15% after 30 and/or 60 days of application. The value of the ratio remained at about 10% even after 120 days (Table 3 and Table 4). 3. The soil from the field to which pendimethalin had been applied was periodically collected. There was a significant correlation between the concentration of the water soluble ingredients in the soil water and the growth inhibition of Italian ryegrass. These findings suggested that the activity of pendimethalin in the soil depended on the concentration of the water soluble ingredients in the soil water (Fig. 3 and Fig.4).
日本雑草学会の論文
1990-07-27

ペンディメタリンの土壌中濃度の経時的変動と植物の生育に及ぼす影響

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