First, the reasons for the occurrence of gas hazards In the greenhouse cultivation, the harm caused is common in ammonia, nitric acid gas, carbon dioxide gas. Ammonia gas mainly originates from the decomposition of chicken manure, urea, ammonium bicarbonate without adequate decomposing, and large accumulation of ammonia in the soil. The production of carbon dioxide gas is mainly in colder weather, coal-fired heating fails to provide timely ventilation, so that carbon dioxide gas accumulates in the greenhouse, causing carbon dioxide gas hazards. Due to the poor ventilation conditions in the arch and the large amount of fertilizer required by the potato, the potato is prone to gas damage under conditions of relatively closed and lack of ventilation. The most likely hazards are ammonia hazards and nitrous acid hazards. Second, the performance of the performance of the symptoms of gas damage The hazards of ammonia on potatoes, the majority occurred in the shed planting or occurred in the early spring plastic film covered potato growing areas. The damage of ammonia to potatoes initially occurred on the top leaves, especially on the new leaves. The damaged leaves began to produce water stains and gradually died of wilting and blackening. The potato seed and roots did not develop mildew. Third, the occurrence of gas prevention and control methods 1. Reasonable fertilization. Most of the potato growing in the greenhouse is covered with plastic film in the arch, which is very important for the selection of fertilizer. Potatoes are hi-fertilizer crops. The use of base fertilizers is too small, which affects the yield. The use of too much fertilizer is prone to fertilizer damage. It is recommended that farmers use fully decomposed chicken manure or cow dung. When using fertilizer, 80 kg of no-tillage fertilizer, 40 kg of pure potassium sulfate, and 2 kg of deep plowing can be used per acre. 2. The occurrence of gas damage, timely ventilation, proper watering, and foliar spray 4000 times liquid Shuofeng 481 plus high-energy red potassium, Shuofeng 481 contains natural brassinolide, is currently China's sixth largest plant growth Regulators can alleviate the damage caused by gas damage, phytotoxicity, and fertilizer damage to crops. Spray once every 7 days, even spray 3 to 4 times, you can gradually recover. 3. Use non-toxic membrane. A resin film made of an ethylene synthetic material should be used to avoid the use of agricultural films incorporating more plasticizer. 4. Strengthen management. Timely cultivating loose soil, combined with cultivator watering, can use 2 kilograms of deep plowing per acre to maintain the normal growth of potato roots in the shed and ensure that the plants are robust and enhance their resistance to toxic gas damage. Potatoes are planted in arch sheds. Due to poor air permeability and high humidity, they are most prone to early blight and late blight. They can be sprayed once every 10 to 15 days for 400 to 600 times, and then added to Shuofeng at the time of spraying. 481 spraying together, better control effect. Poultry Vaccine,Poultry Live Vaccine,Ib Chicken Vaccine,Combined Poultry Vaccine Shangqiu Meilan Biological Engineering Co.,Ltd , https://www.melanvaccine.com