Copper sulfate pentahydrate
Copper sulfate can be used as basal fertilizer, foliar spray and seed treatment. When spreading, it must be ploughed into the soil and evenly applied to have better results. It is not advisable to mix it with a large number of nutrient fertilizers at the same time, so as not to reduce the fertilizer efficiency. Can also be used as a fungicide.
1. As a base fertilizer: apply 1.0-1.5 kg of copper sulfate per mu, mix it with 10-15 kg of dry fine soil, and then spread, strip or hole. The amount of strip application should be less than that of broadcast application. It can also be mixed with farmyard manure or nitrogen-phosphorus-potassium fertilizer. On sandy soils, it is best to mix it with farmyard manure to improve fertilizer retention. Generally, the effect of copper fertilizer is longer, and it is applied once every 3 to 5 years. 2. Seed dressing: 0.3-0.6 kg of copper sulfate is used for each kilogram of seeds. After dissolving a small amount of fertilizer, spray it evenly on the seeds with a sprayer, mix well and dry in the shade before sowing. 3. Soaking seeds: using 0.01%-0.05% copper sulfate solution, soak the seeds in the solution for about 24 hours, and dry them in the shade before sowing. 4. Foliar spraying: It is best to use it on vegetables at the seedling stage, spray with 0.02% to 0.04% copper sulfate solution, and spray 50 to 60 kg per mu. Once every 7 to 10 days, spray 2 times in a row. When a higher concentration is used for foliar spraying, 0.15% to 0.25% of slaked lime should be added to avoid phytotoxicity. 5. Used as a fungicide for melon fusarium 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. The method is: when planting, use 2 kg of copper sulfate and 11 kg of ammonium bicarbonate per mu, mix evenly, and spread it in the planting hole after piling for 15 to 20 hours; or add 500 kg of water per kg of copper sulfate to irrigate the roots, and use 0.3 to 0.5 kg of liquid medicine; or 2 to 3 kg of copper sulfate per mu after planting with water.