How to control the temperature of cucumber in greenhouse?

According to the principle of greenhouse temperature control, after cucumber planting, the indoor temperature should be kept at 25 ~ 30 degrees during the day and at 17 ~ 20 degrees at night to promote the delay of seedling emergence. If the room temperature is high, it is necessary to ventilate and cool down without shading, so that the seedlings can see more sunlight and produce more organic matter, which is beneficial to the health of seedlings.

After the seedlings begin to grow, the daytime temperature is controlled at 28 ~ 32 degrees in the morning, not higher than 33 degrees; It will drop to 25 ~ 27 degrees after 2 pm, 20 ~ 25 degrees after 3 pm, 16 ~ 20 degrees after 4 pm, 16 ~ 18 degrees at 6 ~ 10 pm and 10 pm.

With the growth and development of melon seedlings, the indoor shading rate will gradually increase and the ground temperature will be lower and lower. Attention should be paid to gradually increasing the indoor temperature during the day, so as to increase the ground temperature through heating. Generally, when the seedling height is about 100 cm, the temperature can be controlled at 28 ~ 33 degrees during the day and morning, and the tuyere can be properly opened after noon 1 to gradually cool down. At about 4 pm, the room temperature dropped to 25 degrees, and kept at 16 ~ 18 degrees at night. When the seedling height is 150 cm, the temperature can be maintained at 28 ~ 34 degrees in the daytime and morning, and the other time is still managed as usual. If the greenhouse is tightly sealed, it still can't reach the above temperature, because there is something wrong with the greenhouse structure, and we must find ways to improve it. Try to keep warm before improvement, it is best not to ventilate during the day, and then open the tuyere for ventilation around 4 pm. After mid-March, the cold season has passed, the ground temperature begins to rise, and the indoor temperature can gradually decrease. By the end of March, the indoor temperature can be controlled at 25 ~ 32 degrees during the day, and the ventilation can be gradually increased at night to reduce the night temperature. After April, you can open the tuyere to the maximum, try to reduce the night temperature and reduce consumption.