The temperature management of protected vegetable seedlings is an important part of cultivating strong seedlings. The general principle of temperature management at seedling stage should be “four highs and four lows”, ie “high during the day and low at night”; after sowing, it should be high before emergence (beneficial for emergence and emergence of seedlings), and low after the seedlings are raised; Cloudy days; "high after transplanting, low before transplanting." However, the temperature requirements of different vegetable varieties and the same vegetable variety in different growth periods are not the same and should be treated in specific circumstances.

Different vegetables have different requirements for temperature. Seedlings of cold vegetables such as cabbage and lettuce are required to have an optimum temperature of 15-20°C during the day and 6-10°C during the night; the thermophilic vegetables such as tomato, eggplant, pepper and cucumber generally require a daytime temperature of 20-30°C and nighttime 15-20°C.

Temperature management of the same vegetable in different nursery stages is also different: 1 from sowing to unearthing. Insulation and warming are required to promote the rapid emergence of seedlings. Melon, eggplant and other thermophilic vegetable temperature to maintain at 28-30 °C is appropriate; celery, lettuce, summer cucurbit and other cool vegetables to keep the temperature at 20 °C is appropriate. 2 Unearthed to true leaf exposure stage. Reduce the germination temperature by 4-6°C to prevent seedling growth. 3 seedling growth period. The suitable temperature of the thermophilic vegetable seedlings is 20-30°C, and the cool vegetable is 15-20°C. 4 seedling training stage before planting. When the seedlings are basically grown to the required size, cool down exercises are started. The temperature of the thermophilic vegetable seedlings should be reduced to 15-20°C during the day and 8-10°C at night. The cool vegetables should be 10-15°C during the day and 3-5°C during the night to meet the external environmental conditions.

The temperature adjustment is mainly carried out through "wind release" and "insulation protection against cold". The principle of releasing air during the seedling stage is to release the wind when the outside temperature is high, and to let off when the outside temperature is low. The amount of air released from morning to night within a day is "from small to big, big and small."

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