In recent days, the weather has suddenly dropped to MINUS 15, 16 degrees. What about the vegetables in the greenhouse?

You can cover the greenhouse with tarpaulins and chemical fiber tarpaulins at night. How to improve the cold resistance (freezing resistance) of crops: Any crop has its own minimum temperature requirements. If it is close to or below the minimum temperature, it will slow down growth, and if it is stunted, it will directly lose vitality (freeze to death), which will bring losses to growers. In order to avoid this phenomenon, the author summarizes several suggestions: 1 The temperature should be raised as much as possible, so that the minimum temperature is more than 3 degrees higher than the temperature of crops suffering from cold injury (freezing injury). Temporary heating measures can be taken in the shed, such as burning biogas to raise the temperature, supplying carbon dioxide to crops for absorption and utilization, burning coal stoves and charcoal, lighting, heating wires, etc. Pay attention to the methods and methods when using heating measures, and pay attention to safety! Prevent unfavorable factors from affecting the safety of crops to people and sheds. Especially important! 2 ventilation and hardening seedlings at seedling stage to exercise their cold resistance; 3 water shortage is easy to be frozen (freezing injury), but water shortage is not suitable (but it is not suitable for flooding), which can prevent soil surface hardening, timely intertillage can improve ground temperature, and plastic film mulching can improve ground temperature. 4. Use chemicals to improve the cold resistance of crops. Tianda 2 1 16(800 times)+brown sugar (120 times)+urea (500 times) is sprayed on the leaves (note: Tianda 2 1 16 cannot be mixed with potassium dihydrogen and pesticides and fertilizers containing metal ions).

The above are personal suggestions. Please correct me if there is anything wrong! I hope it helps.