1995 Volume 40 Issue 2 Pages 75-79
The downward mobility of soil applied thenylchlor [2-chloro-N-(3-methoxy-2-thienyl) methy 1-2′, 6′-dimethylacet-anilide] in soil investigated using a soil column was greater in Ryugasaki paddy soil than in Yawara paddy soil. The amount of thenylchlor in the fresh-and centrifuged-soil at 0-1cm soil layer were much greater in Yawara soil than in Ryugasaki soil, whereas at 1-5cm soil layers the amount of thenylchlor in the plant available soil water was greater in Ryugasaki soil than in Yawara soil at all soil layers. Growth of Echinochloa crus-galli was strongly inhibited at 0-2cm soil layers in both soils. In Ryugasaki soil, the growth of E. crus-galli was also strongly inhibited at 2-4cm layers and slightly inhibited at 4-5cm soil layer. However, no phytotoxicity was observed at 2-5cm layers in Yawara soil. Growth inhibition of E. crus-galli was well correlated with the concentration of thenylchlor in plant available soil water. The adsorption of thenylchlor was greater in Yawara soil than in Ryugasaki soil, whereas its desorption was greater in Ryugasaki soil than in Yawara soil. Relationship between herbicidal activity and mobility of thenylchlor applied to soils is discussed.
