According to the China Pesticide Network , the application of copper sulphate can meet the absorption and utilization of copper in crops for 2-3 years. The pH value in the soil can be below 7, and the content of organic matter is relatively high, especially the application of copper sulphate in old vegetable fields. The effect of promoting disease is better.
In vegetable cultivation, eggplant verticillium wilt, tomato bacterial wilt, cucumber wilt, etc. are all caused by soil-borne diseases, and they endanger the common characteristics of these vegetables, which leads to the death of vines in the early stage. In the production of greenhouses, especially under continuous conditions, the root disease of soil-borne vegetables is prevented and treated with copper sulfate, and the effect is quite remarkable. The methods of use are as follows.
1. When planting vegetable crops, use 1.5-2 kg of copper sulfate per acre, mix 8-10 kg of ammonium bicarbonate, mix and simmer for 12-20 hours, which is a copper ammonium preparation, evenly spread before planting. Planting the grass in the planting ditch or planting the seedlings, and then planting the seedlings.
2. After the seedlings are planted and slowed down, use the above prepared copper ammonium preparation to dissolve in water, flush into the vegetable field with water, or directly use 2-3 kg of copper sulfate per acre to pour into the vegetable field, or use 500 times The copper sulfate solution is used to water the roots of vegetable crops, and each plant uses 250 ml of pesticides to prevent and control the dead seedlings caused by soil-borne diseases.
3. After the occurrence of vegetables in Daejeon, the roots of the crops are treated with 500 kg of water per kg of copper sulfate, or the diseased parts of the susceptible plants are coated with 100 times of copper sulfate solution.
When using copper sulfate to control vegetable diseases, be careful not to mix with metal ion-containing pesticides or foliar fertilizers such as mancozeb, because metal ions are easy to cause precipitation, which may cause changes in drug efficacy or cause phytotoxicity; Mixtures of benzoxazole fungicides such as thiophanate-methyl to prevent interaction and reduce or lose germicidal efficacy. For vegetable crops, use copper sulfate. Also pay attention to vegetables sensitive to copper ions. Try not to use copper preparations such as copper sulfate. The concentration should be strictly controlled when using, and the time and dosage should be mastered. When a phytotoxicity occurs, it can be immediately flooded to dilute the concentration and relieve the symptoms. Pesticide manufacturers recommend spraying 800% of the stock solution of 0.06% Brassinolide in the severe case, or 5000-6000 times of the sodium sulphate solution, to relieve the symptoms of phytotoxicity.
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