Copper sulphate, containing 25% to 35% copper, can be used to kill fungi. Copper sulphate aqueous solution has strong bactericidal effect. It is mainly used for controlling various diseases such as fruit trees, malt, potato and rice in agriculture. The effect is good, but it has poor effect on rust and powdery mildew. However, copper sulphate can also cause phytotoxicity to plants, so it is only used on crops that are resistant to copper ion susceptibility or on dormant fruit trees. Copper sulfate is a preventive fungicide. It needs to be used before the disease. It can also be used for algae removal in rice fields and ponds. It is also a trace element fertilizer, which is a common copper fertilizer.
Copper fertilizer can be used as base fertilizer, foliar spray and seed treatment. When you apply it, you must plough it into the soil and apply it evenly to have a good effect. It is not advisable to mix with a large amount of nutrient fertilizer at the same time to avoid reducing fertilizer efficiency. Also used as a fungicide.
As base fertilizer: 1.0-1.5 kg of copper sulfate per acre, mixed with 10-15 kg of dry fine soil, then applied, applied or applied. The amount applied is less than the amount applied. It can also be mixed with farmyard manure or NPK fertilizer. In sandy soil, it is best to mix with farmyard manure to improve fertility. Generally, copper fertilizer has a long-lasting effect and is applied once every 3-5 years.
Seed dressing: 0.3-0.6 kg of copper sulfate per kg of seed, first dissolve the fertilizer with a small amount of water, then spray it evenly on the seeds with a sprayer, and dry it after sowing.
Seed soaking: Use 0.01%-0.05% copper sulfate solution, soak the seeds in the solution for about 24 hours, sown after drying.
Foliar application: The best use of vegetables in the seedling stage, spray with 0.02%-0.04% copper sulfate solution, spray 50-60 kg per acre; 7-10 days once, continuous spraying 2 times. When the foliar application is carried out at a higher concentration, 0.15%-0.25% slaked lime should be added to avoid phytotoxicity. After the preparation, the slag should be removed to prevent clogging of the spray nozzle.
During the floating seedling process of flue-cured tobacco, 20 days after the soaking of flue-cured tobacco, the concentration of 50 mg/L of copper sulfate in the nutrient pool can promote the emergence and rooting of flue-cured tobacco, control the occurrence and spread of blue-green algae, and promote the robust growth and seedling stage of the roots. The growth and development of tobacco plants.
Used as a fungicide: melon wilt, pepper blight, eggplant verticillium wilt, tomato bacterial wilt, Chinese cabbage soft rot, etc., the application of copper sulfate in the early stage of the disease can quickly kill the bacteria and stimulate wound healing. At the time of planting, use 2 kg of copper sulfate per acre plus 11 kg of ammonium bicarbonate, mix well, and put it in the planting hole after 15-20 hours of stagnation; or add 500 kg of water per kg of copper sulphate, 0.3-0.5 per plant. Kilograms of liquid medicine; or 2-3 kg of copper sulfate per acre with water after application.
Tip:
The copper sulfate solution has a corrosive effect on the iron container, so it cannot be sprayed with an iron sprayer. The sprayer should be thoroughly cleaned after use.
Copper sulphate is highly toxic to fish. Spray residue cannot be poured into fish ponds, and sprayers cannot be cleaned in fish ponds to prevent fish from being poisoned.