Lime sulfur is also called sulfur water. It is a red-brown translucent liquid made from quicklime, sulfur and water. It is irritant, smells like rotten eggs, and is highly alkaline. It has the functions of sterilization and contact with certain pests. Because it is harmless to humans and animals and has no residue, it is a commonly used fungicide in pollution-free orchards.
Preparation method
In the case of hydrazine-producing lime sulfur, the commonly used ratio is 1 part of quicklime, 2 parts of sulfur powder and 10 parts of water. The tanning vessel is usually a large pig iron pan. Put a sufficient amount of water in the pot and heat it. Add quick lime to make lime milk. When boiled, slowly use a small amount of water to adjust to a paste-like sulphur syrup. Slowly add in the lime milk, add stirring while recording the water level line, the fire boil 45 to 60 minutes, and constantly stirring, from time to time with hot water to reduce the evaporation of water, until the liquid turns into a reddish brown, the bottom of the pot Serve yellow and green.
After cooling, the residue is filtered with fine grit or gauze to obtain a reddish-brown transparent lime sulfur mother liquor, the quality of which depends on the fineness of quicklime and sulfur powder. Light lime is generally used. Sulfur requires a fineness of 40 mesh. The firepower is large and stable. The higher the raw liquid Baume, the higher the active ingredient (calcium sulfide).
store
The lime sulfur can be stored for a long period of time, but it must be placed in a closed container such as a small-mouth can or a plastic bucket, and a layer of oil is added on the surface of the liquid to prevent it from deteriorating in contact with the air. Then the mouth is sealed and placed in the dark and winter. Icy place. Because it is highly corrosive, it must not be placed in metal containers, and should not be exposed to clothing and skin.
Precautions
1 The lime sulfur mixture is strongly alkaline and cannot be mixed with copper preparations or Bordeaux mixture.
2 Do not spray at temperatures above 32°C or below 4°C. Peach trees are sensitive to lime sulfur and are mainly sprayed before budding or applied to branches. Peach room temperature at the beginning of the spray lime sulfur best choice in the morning when the temperature lower spraying, to avoid spraying at high temperatures at noon, so as to avoid phytotoxicity.
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