A one-time application of copper sulfate can meet the […]
A one-time application of copper sulfate 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 in the old vegetable field, the effect of using copper sulfate in disease prevention and growth is better. it is good.
In vegetable cultivation, eggplant verticillium wilt, tomato bacterial wilt, cucumber wilt, etc., are all caused by soil-borne diseases. The common feature of these vegetables is that they cause dead vines in the early stage of fruiting. In greenhouse production, especially under continuous cropping conditions, copper sulfate is used to prevent and treat soil-borne vegetable root diseases, and the effect is relatively significant. The methods of use are as follows.
1. When planting vegetable crops, use 1.5-2 kg of copper sulfate per acre and 8-10 kg of ammonium bicarbonate, mix well and let it sit for 12-20 hours, which is the copper ammonium preparation, and sprinkle it evenly before planting. Plant the vegetable seedlings in the planting ditch or planting hole.
2. After the vegetable seedlings are planted slowly, dissolve them with the above-prepared cupric ammonium preparation with water and rinse them into the vegetable field with water, or directly use 2-3 kg per mu of copper sulfate to pour into the vegetable field with water or use 500 times Watering the roots of vegetable crops with copper sulfate solution, 250 ml of pesticides per plant, is effective in preventing dead seedlings caused by soil-borne diseases.
3. After the vegetable disease is found in the field, 500 kg of copper sulfate per kg of water is used to irrigate the roots of the crops, or 100 times the copper sulfate solution is used to smear the diseased parts of the diseased plants. The effect of disease prevention is better.
When using copper sulfate to prevent and control vegetable diseases, pay attention not to mix it with mancozeb and other pesticides or foliar fertilizers containing metal ions, because metal ions are easy to cause precipitation, change the efficacy or cause phytotoxicity; nor can it be mixed with carbendazim, Thiophanate-methyl and other benzimidazole fungicides are mixed to prevent interaction and reduce or lose the sterilization effect. Use copper sulfate in vegetable crops, and pay attention to vegetables that are sensitive to copper ions. Try not to use copper preparations such as copper sulfate. When you must use it, you should strictly control the concentration and master the time and dosage of medication. When phytotoxicity occurs, water can be used to dilute the concentration immediately to relieve symptoms. Pesticide manufacturers suggest spraying 800-1000 times solution of 0.006% brassinolide aqueous solution or 5000-6000 times solution of 1.8% sodium nitrate aqueous solution in severe cases to relieve the symptoms of phytotoxicity.