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lime sulfur
In horticulture, lime sulfur (British spelling lime sulphur) is a mixture of calcium polysulfides formed by reacting calcium hydroxide with sulfur, used in pest control. It can be prepared by boiling calcium hydroxide and sulfur together with a small amount of surfactant. It is normally used as an aqueous solution, which is reddish-yellow in colour and has a distinctive offensive odour.
== Creating lime sulfur ==
A New York State Agricultural Experiment Station recipe for the concentrate is 80 lb. of sulfur, 36 lb. of quicklime, and 50 gal. of water (192 g sulfur, 86 g quicklime of high purity per 1000 g (1 liter) of water). Ca. 2.2:1 is the ratio (by weight) for compounding sulfur and quicklime; this makes the highest proportion of calcium pentasulfide. If calcium hydroxide is used, an increase by 1/3 or more (to 115 g/L or more) might be used with the 192 g/L of sulfur. If the quicklime is 85%, 90%, or 95% pure, use 101 g/L, 96 g/L, or 91 g/L; if impure hydrated lime is used, similarly increase its quantity. Avoid using lime that is less than 90% pure. Boil for an hour, stirring and adding small amounts of hot water to compensate for evaporation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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