The harmful gases generated in greenhouses are mainly the toxic gases contained in ammonia, nitrogen dioxide, and plasticizers generated during the decomposition of fertilizers. There are four effective measures to prevent the generation of these harmful gases:
First, organic fertilizers should be mixed with water for 2 to 3 months before being applied to the shed. After the accumulation, the plastic film should be tightly sealed and fully fermented before being applied to the shed.
The second is to pay attention to the use of chemical fertilizers indoors:
1. Not apply ammonia, ammonium bicarbonate, ammonium nitrate and other volatile and volatile fertilizers;
2. When urea, ammonium sulfate and other non-volatile fertilizers are used as part of the base fertilizer, it shall be mixed with superphosphate and then applied to the ditch or tillage;
3, application of urea, ammonium sulfate, potassium sulfate, etc. for top dressing, can not be mixed with alkaline fertilizer. It is necessary to use flushing with water, and do less work.
Third, the shed film and plastic film used in the shed must be safe, reliable and non-toxic. It is important to remember that no renewable film is available. Fourth, once toxic gases are generated in the shed, ventilation and air exchange methods should be adopted to reduce the concentration of toxic gases, thereby reducing or even preventing the occurrence of phytotoxicity.
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