First, several common air harm 1. Ammonia Hazard Ammonia mainly comes from the ammonium nitrification fertilizer and organic fertilizer applied to the soil. Especially when fertilizer is applied excessively or the soil is dry, the fertilizer will cause large amounts of ammonia to burn the vegetables when it is exposed to high temperature inside the greenhouse. 2. Acid gas hazard The nitrous acid gas in the greenhouse is mainly derived from nitrate-added nitrogen fertilizers and uncomplex organic fertilizers applied to the soil. The lower leaves of the general plants are seriously affected. The damage caused by eggplant vegetables is particularly serious. 3. Carbon monoxide and carbon dioxide gas are harmful to the heating of the greenhouse. The incomplete combustion of the coal fire or the lack of smooth flue will produce a large amount of carbon monoxide and carbon dioxide, which have different degrees of harm to the vegetables. 4. The film toxic gas hazard plastic emits some toxic gases during use, and can invade the interior of the plant, thus seriously affecting the yield and quality of the vegetables. 5. Aerosol pesticides and other hazards such as burning out chlorothalonil overdose will lead to wilting and death of the top leaves and outer edges of vegetables. The damage will be more severe under high temperature and high humidity conditions. Second, control 1. Proper ventilation ventilation In greenhouses that are closed for a long period of time in winter and spring, sunny days or long-term rain, ventilation openings should be opened at regular intervals when the temperature is high at noon. Even if it is rainy, it must be done for a short period of time. 2. Reasonable fertilization greenhouse fertilizer should be dominated by soil miscellaneous fertilizer, followed by chemical fertilizer supplement. Application of various organic fertilizers must be fully decomposed. Control the amount of nitrogen fertilizer application and increase phosphorus and potassium fertilizers. Fertilizer to deepen the ditch, a small number of times, after the application of soil watering. 3. Remove water droplets from the ceiling to reduce the harmful gas source. The use of non-toxic plastic film, the use of coal fire heating in the shed must have a chimney smoke, coal must be fully burned.
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