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Thenylchlor Concentration in Soil Water and its Herbicidal Activity.

1994; The Weed Science Society of Japan; Volume: 39; Issue: 3 Linguagem: Inglês

10.3719/weed.39.160

1882-4757

Katsuichiro Kobayashi, Masahide Onoe, Hirosi Sugiyama,

Allelopathy and phytotoxic interactions

The herbicidal activity of soil applied thenylchlor [2-chloro-N-(3-methoxy-2-thienyl) methyl-2′, 6′-dimethylacetanilide] on Echinochloa crus-galli Beauv. var. formosensis Ohwi was more remarkable in Ryugasaki paddy soil than in Yawara paddy soil. The soil applied with thenylchlor solution was separated into centrifuged-soil and plant available soil water by centrifugation. The amount of thenylchlor in the soil water was greater in Ryugasaki soil than in Yawara soil, whereas the amount in the fresh-soil and the centrifuged-soil were found greater in the latter. The growth of E. crus-galli in thenylchlor solution directly prepared was suppressed so that it was similar to that in the soil water from soils previously applied with the herbicide. The metabolites of thenylchlor in soil had no herbicidal activity on the weed. It was suggested that the herbicidal activity of thenylchlor applied to soil was dominated by the concentration in plant available soil water.