ブタクロール並びにプレチラクロールの水田土壌中濃度と稲に対する作用性

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Concentrations of acetanilide herbicides, butachlor (2.5% granule) and pretilachlor (2.0% granule) in paddy soils were evaluated in relation to their phytotoxicity to rice plant (CV. Musashikogane), using Yawara and Ryugasaki paddy soils with different properties. The results obtained are as follows : 1 . The amount of acetone-soluble ingredients of butachlor and pretilachlor in the Yawara and Ryugasaki paddy soils (0〜1 cm) was reduced to 10〜25% of the initial dose, after 10 days of herbicide application. Residual ratio of the two herbicides showed the same trend, but was slightly higher in the Ryugasaki soil. Most of the ingredients were localized in the 0〜1 cm layer of the soils. 2 . The ratio of the water-soluble ingredients to the acetone-soluble ones in the soil was found to be 30%, on the day of herbicide application, except for butachlor in the Yawara soil. The butachlor ratio in the Yawara soil was 15%. The amount of butachlor soluble in water after 3, 5 and 10 days of application was found to be 21, 8 and 15% in the Yawara soil and 25, 15 and 14% in the Ryugasaki soil. On the other hand, the ratio of water-soluble pretilachlor in the two soils types ranged from 5 to 8.5% 3 days after herbicide application. 3 . The percentages of rice plants injured by the herbicides were higher in the Ryugasaki soil than in the Yawara soil. Phytotoxicity to rice plant of butachlor or pretilachlor was closely related to the concentrations of the water-soluble ingredients in the soil. These findings suggest that the phytotoxicity to rice plant of acetanilide herbicides depends on the concentration of water-soluble herbicides which is affected by the soil properties.
日本雑草学会の論文
1990-07-27

ブタクロール並びにプレチラクロールの水田土壌中濃度と稲に対する作用性

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