When growing tomatoes in greenhouses, how to control the temperature in autumn and winter?

The growth temperature of greenhouse tomatoes is 10℃ ~ 35℃, and the average monthly temperature is 20℃ ~ 25℃. During the day and morning, the temperature is 23°C ~ 28°C, and shall not be higher than 35°C; in the afternoon, the shed is closed when the temperature gradually drops to 23°C. Night temperature is 15℃ ~ 18℃. The optimal temperature difference between day and night is 10°C ~ 13°C. Growth is inhibited when it is lower than 10°C, and plants stop growing when it is lower than 5°C. When the temperature reaches 1℃ ~ 2℃, plants and fruits will suffer freezing damage. Tomatoes have a long harvest cycle and high yields, and require a certain proportion of various nutrients. Every 1,000 kilograms of tomatoes should absorb 2.5 to 3.5 kilograms of nitrogen, 0.8 to 1 kilogram of phosphorus, 4.2 to 4.8 kilograms of potassium, 1.6 to 2.1 kilograms of calcium, and 0.3 to 0.6 kilograms of magnesium. To prevent soil salinization, flood irrigation should be carried out once a month to remove salt. When watering, pay attention to the water temperature. It was found that when the watering temperature is lower than 7°C, a large number of hollow tomato fruits will be produced, seriously affecting the quality.

During production, attention should be paid to promptly removing side branches and cutting off old leaves at the lower part of the plant. When the tomato fruit has fully grown and entered the white-ripening stage, all the leaves at the lower part of the ear can be cut off to maintain ventilation and light transmission, which not only supplements the light, ensures the consumption of nutrients, but also reduces the occurrence of diseases and insect pests. Tomatoes have a relatively long growth period, relatively high yields, and large and comprehensive nutritional requirements. Therefore, it is necessary to control the proportion of nutrients in the fertilizer to ensure that it contains the nutrients needed by tomatoes. Base fertilizer should be fully applied before planting. In order to ensure the robust growth of tomatoes, top dressing should be done during the growth period. Tomato top dressing should be mainly in small amounts. The suitable temperature for tomato growth is around 22°C. The temperature in winter is very low, but greenhouse cultivation can effectively control the temperature.

The key issue in greenhouse tomato cultivation in winter is temperature control. In addition to ensuring the normal growth temperature of tomatoes, growers should try to control the temperature difference between day and night at around 12°C. Otherwise, tomato plants may suffer frost damage. Tomatoes have great demand for light, and their yield is directly related to the duration of light. We should improve the permeability of the orchard and remove side branches and old leaves in a timely manner. This can increase the light-receiving area of ??plants, reduce nutrient consumption, promote healthy growth of fruits, and effectively reduce the occurrence of diseases and insect pests. Tomatoes also have high water requirements. When planting tomatoes, pay attention to watering and make sure the soil is moist. The watering method is drip irrigation, both dry and wet. Pay attention to the water temperature in winter, and control the water temperature at around 10°C, otherwise the fruit quality of tomatoes will be reduced.