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The influence of electric conductivity (EC) and temperature of paddy water on several properties and the herbicidal efficacy of naproanilide 1kg granule containing a floating carrier were investigated. This granule surfaced 7-15mins after application, while an ordinary 3kg granule did not rise to the surface at all. The EC of paddy water affected the surfacing ratio; the ratio was 70% when EC was 100μS/cm, but it was 5% at 800μS/cm. Naproanilide concentration in water was also affected by EC; it was 0.8ppm at 100μS/cm while it was 0.3ppm at 600μS/cm. Water temperature affected surfacing ratio and naproanilide concentration in water also: more than 70% and 1.Oppm, respectively, when water temperature was 25°C, but 0% and less than 0.05ppm at 10°C. There was a correlation between surfacing ratio and naproanilide concentration in water. Herbicidal efficacy against Sagittaria pygmaea Miq. was low at higher EC and at lower water temperature. From these results, the surfacing phenomenon is important for release of naproanilide into water and its herbicidal efficacy.

Effets of Water Electric Conductivity and Water Temperature on Properties of Naproanilide 1 kg Granules.