Effects of Paddy Soil Properties on Herbicidal Activity of Naproanilide.

概要

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The effects of paddy soil properties on the herbicidal activity of naproanilide were investigated.1) The herbicidal activity of naproanilide on Scirpus juncoides Roxb. differed with the type of soil collected from paddy fields in 35 locations in Japan. The I90 ranged from 0.5 to 2.0ppm for the soils collected from 29 locations, while around 4ppm for the soils 4 locations from, HOKKAIDO (NANPOLO), TOCHIGI (UTSUNOMIYA), IBARAGI (USHIKU) and KANAGAWA (FUJISAWA). High carbon content and strong ability to adsorb naproanilide and NOP were the common characters of the 4 soil types.2) Carbon content, nitrogen content and ability of soil to adsorb naproanilide and NOP were highly correlated with the herbicidal activity of naproanilide.3) Lightness, hue and saturation of soil color were correlated with the herbicidal activity of naproanilide, and the soil color was correlated with the Kd of adsorption of naproanilide and NOP.4) It was estimated that the reduction of herbicidal activity of naproanilide in the paddy fields was due to the strong adsorption of naproanilide and NOP by the soil containing a high carbon content. It was suggested that the identification of the soil color was a simple method for estimating fluctuations of the herbicidal activity of naproanilide in paddy fields.
日本雑草学会の論文