How many degrees is the general temperature of the greenhouse

15-30℃The plastic film has a heat preservation effect. After covering the film, the turbidity in the greenhouse will increase with the outside temperature, and decrease with the outside temperature, and there are obvious seasonal changes, the temperature difference between day and night. The greater the temperature difference in the low-temperature period, the daily warming in the cold season can be up to 3-6 ℃, cloudy days or night warming capacity is only 1-2 ℃. The temperature difference between the shed and the open ground gradually increases in the spring, and the temperature rise can reach 6-15℃. When the outside temperature rises, the temperature inside the greenhouse will rise relatively, up to 20 ℃ or more. So there is a danger of high temperatures and freezing in the greenhouse, which needs to be regulated manually. In the hot season, the shed can produce high temperatures of 50°C or more. The whole shed should be ventilated, and the outside of the shed should be covered with a straw curtain or a shed, which is 1-2°C cooler than the open air temperature. In winter, on sunny days, the minimum temperature at night is 1-3℃ higher than that of the open ground, and on cloudy days, several subjects are the same as that of the open ground. Therefore, the main production seasons of greenhouse greenhouses are spring, summer and fall. Through insulation and ventilation cooling, the greenhouse temperature can be maintained at 15-30℃.