Bordeaux mixture is a sky-blue colloidal suspension, which can prevent spore germination, pathogen infection and sterilization. 1882 originated from Bordeaux, France. Bordeaux solution is generally alkaline and has good adhesion, but its physical properties are destroyed after long-term storage. Can be used together, or can be made into dehydrated Bordeaux powder, and then mixed with water when used.
The chemical composition of the effective components in Bordeaux solution is CuSO4 XCU (OH) 2 YCA (OH) 2 ZH2O. It is made of about 500 grams of copper sulfate, 500 grams of hydrated lime and 50 kilograms of water.
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Sterilization principle of bordeaux mixture
Bordeaux mixture itself has no bactericidal effect. When it is sprayed on the surface of plants, it is adsorbed on the surface of crops because of its adhesion.
Plants secrete acidic liquid during metabolism. When bacteria invade plant cells, a small amount of basic copper sulfate in Bordeaux solution will be converted into soluble copper sulfate. Thereby generating a small amount of copper ions (Cu2+), and after Cu2+ enters the germ cells, the protein in the cells is solidified.
Cu ~ (2+) can also destroy some enzymes in its cells, so that the metabolism in bacteria can not be carried out normally Under the influence of these two effects, bacteria can be poisoned to death.
The preparation method is as follows: firstly, 1/3 water is taken to prepare lime emulsion, which is fully dissolved and filtered for later use; Then take 2/3 of the water to prepare copper sulfate solution, and fully dissolve it for later use. Slowly pour the copper sulfate solution into the lime emulsion while stirring, or slowly pour the copper sulfate solution and the lime emulsion into the same container while stirring.
Baidu Encyclopedia-Bordeaux Liquid