After entering the deep winter season, the temperature inside the shed is low, especially in many old sheds, and the insulation performance is poor. The temperature in the cold shed is only 7~8°C, which easily causes low temperature barriers in vegetables and measures should be taken to prevent them in time.

Poor flower bud differentiation, malformed fruit increase The temperature of flower bud differentiation in most vegetables is generally 20 ~ 30 °C, long time below or above this temperature, will cause poor flower bud differentiation, malformed fruit, empty fruit or falling fruit. When the temperature is lower than 15°C, the pepper has poor flower development.

Poor fruit coloring Tomatoes, peppers and other fruit during the conversion period should be suitable temperature. The optimum temperature for the formation of lycopene is 24°C when the tomato turns color. When the night temperature is lower than 8°C, the formation of lycopene will be destroyed. Even if the temperature is later given, it will be difficult to turn red. The residual green or brown remains. , there is a flower face fruit.

Root injury, lack of symptoms more than the temperature below 15 °C, the root absorption of water and nutrients activities basically stopped, long-term hypothermia will cause lack of disease symptoms, such as leaf yellowing, pepper purple spot and so on.

The most suitable temperature for photosynthetic use of most vegetables is 25-30°C. The morning is the most important time for the formation of photosynthetic products in the leaves. It is necessary to control the temperature. Temperatures above 32°C or below 22°C will reduce photosynthesis in leaves, reduce the production of nutrients, and cause plant weakness, stagnation, and fruit failure.

In order to prevent the low temperature barriers of greenhouse vegetables, we must first do a good job of greenhouse insulation. One is to add a layer of floating membrane when it encounters the cold current to improve the insulation performance of the greenhouse and press it with the soil bag to prevent it from being blown by strong winds. The second is the addition of a "shed in the shed." When extreme cold weather occurs, a “shed in the greenhouse” is added in the vegetable greenhouses, which means that one or two layers of membrane insulation are set in the greenhouse, especially for the thermophilic vegetables such as loofah and bitter gourd. The third is to spread straw or rice husks. Put 10 cm thick straw or rice husk in the operation line, and then spray a suitable amount of high fertility, can play a role in regulating the temperature inside the shed, release heat and carbon dioxide.

Second, we must avoid cold wind blowing directly into the shed. The outside temperature is generally low, it is best to set up a windproof membrane in the vent, to avoid blowing cold air directly into the shed, resulting in low temperature barriers to vegetables.

Again, attention is paid to improving plant resistance. Cultivate strong seedlings, rational fruit retention, reduce excessive consumption of nutrients; spraying chitin, alginolactone, full-foliage foliar fertilizer, etc., improve leaf photosynthetic capacity and plant resistance.

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