The production of greenhouse vegetables often suffers from fat hazards and high-temperature hazards, which has a great impact on the yield, quality, and benefits of greenhouses. Its main prevention and control methods: First, the prevention and treatment of fertilizer hazards 1. Deep fertilization material. Fertilizer should be deeply applied or dissolved in water. 2. Appropriate amount of fertilizer. Due to the loss of fertilizer in the greenhouse, the fertilizer application rate is in principle lower than that of open-air vegetables. 3. Organic fertilizer applied. Organic fertilizers, in particular bar fertilizers and manure urine, must be applied after sufficient decomposed fermentation. 4. Breathe in time. Whichever kind of fertilizer is applied, it should not be done in the evening. After the application, ventilation and ventilation should be strengthened, and a certain amount of ventilation should be maintained at night so as to prevent harmful gases from accumulating in the shed when the fertilizer is decomposed and poisoning the vegetables. 5. The fertilization distance should be suitable. Topdressing fertilizers such as urea should not be close to the roots to prevent root burning. When the leaf fertilizer is applied, the concentration is preferably 0.5% to 1%. 6. The amount should not be too large. Regardless of topdressing or foliar spray fertilizer, the amount must be appropriate. Second, the prevention and treatment of high temperature hazards 1. Increase ventilation. Adjust the air in the shed to make the air fresh and eliminate all harmful gases in the shed. Ventilation is gradually controlled when the outside temperature rises to about 18°C. 2. Control temperature. In the greenhouse, the daytime temperature should be controlled at 20 to 25°C, and at night it should be controlled at 15 to 18°C. The temperature control can be combined with ventilation, ventilation, and water spraying. 3. Timely replenishment. When there is water shortage in greenhouses, water should be added in a timely manner to adjust the temperature with water and reduce the heat hazard.
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