A new method for rapid preparation of lime sulfur

Lime sulfur is a broad-spectrum insecticidal, acaricidal and bactericidal agent, which has a good effect on the control of crop anthracnose, perforation, leaf lotting, powdery mildew, black pox, and red spider and scale insects. However, due to the inconvenience and time-consuming of sulphate-sulfur mixture, the quality of the smelting system is unstable, and the improper use of sulphide is prone to injury, resulting in the gradual elimination of lime sulfur. However, lime sulfur is an inorganic pesticide, which has long efficacy and low cost. It kills insects and sterilizes. The sulfur and calcium contained in it are also the nutrients needed by the crop and have no pollution to the environment. After repeated experiments, the author found a new method for making lime sulfur, and improved the use of the method, eliminating the need to measure the calculation of concentration and other inconvenient matters, is very suitable for widespread promotion in rural areas.

One, tanning method

The proportion of lime sulfur mixture is generally lime:sulfur:water=1:2:10, that is, 1 kg of lime, 2 kg of sulfur, and 10 kg of water are required to produce a one-pot lime sulfur mixture. More than 10 kg of lime sulfur can be obtained. The old method is to boil lime water, then add sulfur yellow powder, and then continue to cook for 1 hour. It takes 2 to 3 hours from the ingredients, to the fire, and finally to the cooking, and the quality is not easy to control. The author's new method for making lime sulfur mixture is to first mix 2 kg of sulfur powder with hot water into a paste, then pour it into the pot together with 10 kg of water, and heat it while stirring, until the slurry in the pan begins to boil, and then 1 to 1.5 kg of lime are poured. It must be noted that the use of quicklime blocks (because the powdered lime has regained moisture, the chemical composition is changed to calcium hydroxide and calcium carbonate, the finished product is yellow-green, the efficacy is very low), and the quicklime block should not be poured once , so as not to violently splash the liquid outside the pot. With the continuous addition of lime, lime, sulfur and water produce a violent chemical reaction, generating calcium polysulfide, and the liquid gradually becomes red-brown. Then use the medium heat for 10 minutes and add water while stirring to supplement the amount of evaporated water. A layer of thin, ice-like, reddish-brown transparent crystals is deposited on the surface of the liquid, indicating that the liquid has been tamped. Sticks can also be used to drop liquids into cold water. The liquid can quickly spread out, indicating that the reaction is over. Longer tapping time will affect the quality of the liquid. The entire process takes only about one hour, saving more than half the time compared to the old method. When the new method is added with lime, the temperature of sulfur slurry has reached 100° C., the reaction temperature is high, the reaction time is shortened, the reaction is more complete and complete, and the concentration of the liquid medicine is increased by more than 5 bmm above the old method. The new tanning method has many advantages such as labor saving, fire saving, time saving, etc., and has high concentration of liquid medicine and stable product quality.

Second, use method

In the past, the use of Baume weight scales to measure the number of fluids was good, and then the formula was used to calculate the amount of water used. It was difficult for farmers' friends to grasp. Now according to the new method, it can ensure that the concentration of the liquid medicine is above 25 bpm, plus a certain range of dosage, so the calculation procedure can be omitted when using, just press “1 sprayer water before fruit sprouting (about 10 Kilograms) 2 kg of liquid medicine, 1 sprayer plus water 0.2-0.3 kg after germination. The method can be used for operation. The medication is very safe and convenient, and the preparation is simple.

The new drugs are used in new ways, which are both economical and affordable; they can both protect efficacy and reduce pollution, and can also solve the problem of pest resistance.

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