Lime sulfur is a bactericide made of lime, sulfur and water. It is a reddish-brown transparent liquid with smell of smelly eggs, strong alkaline, and corrosive effect on the skin. The main component is calcium polysulfide CaSSx. First, the brewing method is weighed according to the proportion of lime, sulfur, and water in the ratio of 1:2:15. Such as quick lime 50 grams: sulfur 100 grams: water 750-800 grams. Use a small amount of hot water to make sulphur powder into a paste. The quicklime is placed in a hot water bath and turned into lime milk, which is then put into a paste of sulphur powder. Add it to the side and mix it with lime milk. After about 40-60 minutes, the liquid is reddish-brown and the liquid surface is a layer of film with pungent odor. Let it cool. Take the cooled supernatant (also known as the original solution) and place it into a 20-mL graduated cylinder. The specific gravity of the sample is measured using a Baume weightmeter. Generally 20-30 Baume degree is better, diluted to 0.2-0.3 Baume degree application. Second, the lime sulfur stock solution dilution method is calculated by the following formula: water multiple = raw liquid Baume degree / need to dilute the Baume degree -1, for example: the original liquid Baume 20 degrees, to be diluted to Baume 0.5 degree liquid, need to How much water? Then add water multiple=20/0.5-1=39. Third, the matters needing attention 1, quicklime to choose clean white lump, sulphur choose golden yellow, water should use river or pond water, not well water. 2. Use raging fire to avoid simmering. If it is not a time to increase the volume of water, it should be constantly replenished with the amount of water lost by evaporation (heated water). 3, when the liquid into auburn, from the film, immediately stop heating. If it is too long, it will turn green brown and lose its active ingredients. 4. When cooking, use old wok instead of new wok or copper container. 5, when stored, refueling closed, dark, stored in a cool place. 6. Dilute with river or pond water when using. 7, the agent for citrus, apples, persimmons, cabbage, cabbage, pumpkin, watermelon, sponge gourd, eggplant safer, peach, plum, plum, pear, tomato, cucumber, onion, grapes are prone to phytotoxicity. 8, the use of the concentration of the plant growth phase of the morning and evening, varieties, differences in the types of pests, as well as the purpose and time of use varies. General plant dormancy use concentration should be high, the growth period should be low, early spring is more concentrated, summer is relatively dilute, the growth period susceptible to phytotoxicity plants can be used 0.2 Baume degree, deciduous fruit trees dormancy period available Baume 5 degrees. 9, the best application time is sunny and morning without wind, the weather should not be sprayed in wet conditions. High temperature (more than 32 °C), low temperature (less than 4 °C) prone to phytotoxicity, should not be used. 10. General pesticides should not be mixed with lime sulfur. When lime sulfur is used in conjunction with Bordeaux mixture, the two agents are used at intervals of at least two weeks. 11, the agent is strongly alkaline, can corrode the skin, be careful when dispensing medicine. Wear masks, holsters, etc. 12. The instruments and sprayers used for medicine should be washed with vinegar and then washed with clean water. Otherwise, the sprayer will be damaged. 13, dregs can be used as a paint and whitening agent. China Agricultural Network Editor
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