Tomato is a temperature-loving vegetable, generally speaking, it can adapt to tomato growth within the temperature range of 15～35℃. The seedlings that have undergone cold tolerance training can withstand a short period of -2°C. The optimum ground temperature for tomato growth is 20～23℃. When the local temperature drops to 6℃, the root system stops growing.
The specific requirements for the growth environment of tomatoes are as follows:
1. Temperature:
Tomato is a thermophilic vegetable. Under normal conditions, the optimum temperature for assimilation is 20-25℃, and the optimum soil temperature for root growth is 20-22℃. Increasing soil temperature can not only promote root development, but also significantly increase the nitrate nitrogen content in the soil, accelerate growth and increase yield.
2. Light:
Tomato is a light-loving crop, with a light saturation point of 70,000 lx, and a suitable light intensity of 30,000 to 50,000 lx. Tomatoes are short-day plants. Short-day sunshine is basically required in the process of changing from vegetative growth to reproductive growth, but the requirements are not strict. Some varieties can bud and flower in advance under short-day sunshine, while most varieties bloom more in 11～13h sunshine. Early, the plant grows vigorously.
3. Moisture:
Tomatoes need more water, but they don't need to be irrigated frequently. Generally, the soil humidity is 60-80% and the air humidity is 45-50%. The high humidity of the air not only hinders normal pollination, but also causes serious diseases under high temperature and high humidity conditions.
