How to do a good job of anti-freezing and heat preservation of vegetables and fruits in greenhouse in rainy season?

Improve the greenhouse structure: if possible, it is best to use galvanized steel pipe greenhouse. It is best to use greenhouse film. If it is an ordinary film, it is best to use polyethylene film. First of all, you can paint building materials and walls, which can increase reflection and prolong service life. We can appropriately increase the height of the greenhouse and improve the lighting conditions in the shed. The air humidity in the solar greenhouse is often higher than that in the open field and is in a humid state. Therefore, dehumidification is the most important thing to manage the air humidity in solar greenhouse. The dehumidification measures in production are summarized as follows: ventilation, reasonable watering, plastic film mulching, cooling and humidity reduction, strengthening the temperature and heat preservation measures in greenhouse.

In the early stage of vegetable growth, that is, the first flowering and fruiting period, the daytime temperature should be controlled at about 23 degrees Celsius, and the thermometer should be hung in the middle, not under the hood to see the average temperature. The temperature required in the full fruit stage is 28-30℃, which refers to the expansion temperature of the fruit, so the thermometer is usually hung at the first ear, that is, about 30 cm from the ground. Continue to do a good job in antifreeze and heat preservation of vegetables and fruits in greenhouses. Strengthen the management of temperature and humidity in greenhouse, protect flowers and fruits, and pay attention to ventilation.

Spraying foliar fertilizer with high-fat film and 0.2% potassium dihydrogen phosphate solution on greenhouse vegetables can not only supplement plant nutrition, but also prevent bacterial infection and enhance cold resistance. When it rains during the day, clear the plastic film in time to prevent reeds and grass. Protect the insulation effect from the rain, but be careful not to let the rain enter the boundary; If it rains at night, dry the plastic film as soon as possible. In the afternoon before the first frost, covering vegetable fields and vegetables with straw can reduce cold damage and dilute scattered objects. Never cover all the vegetables, so as not to affect their photosynthesis.

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