| 摘要 |
PURPOSE:A herbicide for paddy field, containing a fine particulate slightly water-soluble herbicidal active component in a stable suspended state, having a specific viscosity, initial water surface diffusion rate and surface tension and capable of being sprinkled on paddy field without diluting with water and rapidly extending on the surface of the paddy field after sprinkling. CONSTITUTION:A herbicide for paddy field containing a fine particulate slightly water-soluble herbicidal active component, e.g. oxadiazon or dimuron, having <=10mum particle diameter in a stable suspended state, having 180-500cP viscosity (20 deg.C), >=4.0cm/sec initial water surface diffusion rate (20 deg.C) and 25.0-31.0 dynes/cm surface tension (25 deg.C). The herbicide is capable of rapidly extending on the surface of paddy field, uniformly dispersing agricultural chemical active components in water, uniformly adsorbing on the soil surface and forming a stable treating layer. The above-mentioned herbicide is produced by pulverizing and mixing active components in the presence of a surfactant, water-soluble high polymer, flocculation inhibitor, etc., using water as a solvent and dispersing the resultant mixture as ultrafine particles by vigorous stirring, etc. |
