| 摘要 |
An expanded soil-treating agent having prolonged action is produced by extruding a mixture of thermoplastic resin, vaporizable expanding agent, and a fertilizer, plant growth regulant, or pesticide as active substance at a temperature below the m.p. of the pure resin and granulating the expanded extrudate. The resin may be polyethylene, polyvinyl chloride, polyacrylate, or homo- or co-polystyrene. The expanding agent may be petroleum ether or n-pentane. The active substance may be a PKN fertilizer or urea; a compound containing boron, copper, iron, or magnesium; peat, bran, or wood flour; or indolyl acetic acid, gibberellic acid, or meso-inosite. The mixture may also contain heat-absorbing dye or pigment; a wetting agent; or a silicone, stearate, or wax. The extruded resin may be coated with expanded or unexpanded resin.ALSO:An expanded soil-treating agent having prolonged action is produced by extruding a mixture of thermoplastic resin, vaporizable expanding agent, and a fertilizer or plant growth regulant as active substance at a temperature below the m.p. of the pure resin and granulating the expanded extrudate. The resin may be polyethylene, polyvinyl chloride, polyacrylate, or homo- or copolystyrene. The expanding agent may be petroleum ether or n-pentane. The active substance may be a PKN fertilizer or urea; a compound containing boron, copper, iron, or magnesium; peat, bran, or wood flour; or indolyl acetic acid, gibberellic acid, or meso-inosite. The mixture may also contain heat-absorbing dye or pigment; a wetting agent; or a silicone, stearate, or wax. The extruded resin may be coated with expanded or unexpanded resin.ALSO:An expanded soil-treating agent having prolonged action is produced by extruding a mixture of thermoplastic resin, vaporizable expanding agent, and a herbicide, fungicide, or insecticide as active substance at a temperature below the m.p. of the pure resin and granulating the expanded extrudate. The resin may be polyethylene, polyvinyl chloride, polyacrylate, or homo- or co-polystyrene. The exanding agent may be petroleum ether or n-pentane. The mixture may also contain heat-absorbing dye or pigment; a wetting agent; or a silicone, stearate, or wax. The extruded resin may be coated with expanded or unexpanded resin.
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