Temperature and light control to note when growing tomatoes in winter

After entering winter, as daylight hours become shorter and nighttime temperatures are lower, humidity inside the greenhouse gradually increases, and some low-temperature, high-humidity soil-borne diseases are extremely likely to occur, adversely affecting the normal growth of tomatoes. The key technical management points for tomatoes in winter are set out below:

1. Temperature management. After entering winter, greenhouse tomatoes should focus on heat preservation and warming. Low temperatures easily cause tomato flower and fruit drop, and can even cause freezing damage, greatly reducing the fruit-setting rate and thus seriously affecting yield. Therefore, the temperature inside the greenhouse must be controlled scientifically. Generally, the daytime temperature should be kept at 23°C-28°C and the nighttime temperature at 15°C-18°C; the above temperatures are the most suitable for tomato growth. In the event of blizzards or windy, cooling weather, methods such as coal stoves, heating, or artificial supplemental lighting can be used to raise the temperature.

2. Light and ventilation. Tomatoes are light-loving crops. When light is sufficient, the plants grow vigorously and have strong disease resistance. Conversely, it will cause the plants to bolt, weaken their growth vigor, and also create conditions for disease infection. Methods such as hanging reflective curtains on the back wall, regularly cleaning dust or dirt off the greenhouse film, and removing fog droplets inside the greenhouse film can be used to increase the light inside the greenhouse by every possible means. Ventilation can achieve the purposes of removing moisture, exchanging air, and regulating temperature. The ventilation time should be adjusted according to weather conditions, but a certain amount of ventilation time must be ensured every day, as this is beneficial to the normal growth of the plants.