Copper sulphate is both a fertilizer and an ancient and commonly used fungicide. The famous Bordeaux liquid, copper soap liquid and copper ammonium preparation are prepared by using copper sulfate with quicklime, soap and ammonium hydrogencarbonate, and have been used up to now. The bottled "blue" water that is currently on the market is also a copper preparation. Therefore, copper sulfate is a reliable fungicide. Copper sulphate is first and foremost a protective agent. It has a protective effect before the onset of the disease, and it can not only kill the bacteria quickly but also stimulate the wound healing in the early stage of the disease. The effect of copper on pathogenic bacteria is: when the liquid is in contact with the pathogenic bacteria, the copper ions enter the bacteria and interact with the protein to denature the protein, thereby causing the metabolic activities of the bacteria and eggs to fail. At the same time, copper sulphate also activates certain soil nutrients, increasing crop nutrition and stimulating growth, so copper sulphate is a rare broad-spectrum bactericidal growth promoter. At present, in the greenhouse vegetable production, especially under continuous cropping conditions, the masses are increasingly scratching their heads on the root diseases of vegetables. The author tested copper sulfate for prevention and treatment, and achieved very satisfactory results. The specific methods of use are briefly introduced as follows: 1. 2 kg of copper sulfate per acre, 11 kg of ammonium bicarbonate, crushed, mixed, filled into a complete plastic bag, sealed for 24 hours. (It is a copper ammonium preparation). Evenly spread into the planting ditch or hole before planting. 2. After the planting seedlings are slowed down, the above-mentioned medicament (copper ammonium preparation) is dissolved and poured with water. 3. Iot the roots of the crop with 500 times of copper sulfate solution, 250 grams of liquid per plant. 4, 5 kg of copper sulfate per acre, dissolved and washed into the vegetable field with water. After using copper sulfate, it has good control effect on eggplant verticillium wilt, cucumber wilt, pepper blight, tomato bacterial wilt, etc., which are refractory pathogens that survive on crop residues or in soil for 6-8 years. Its efficacy lasts for 12 to 16 months.
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