Optimum temperature for tomato growth

The tomato is a thermophilic and thermostable vegetable, which can grow in the temperature range of 15 to 33°C, and grows best when it is 22 to 25°C during the day and 15 to 18°C ​​at night. Poor growth at high temperatures, temperature above 30 °C and strong light can easily induce virus disease, poor growth above 33 °C, 40 °C to stop growing, the plants will soon die. However, the temperature requirements for each period of tomato growth are not exactly the same.

Germination period: The minimum germination temperature of tomato seeds is 8.7°C, the optimum temperature is 20～25°C, the germination rate is lower than that of 35°C varieties, generally less than 20°C, germination becomes slower, long-term temperature below 10°C not only germinates slowly but also easy. Rotten species "plasma package."

Seedling period: The adaptability to temperature is strong, but the temperature is too high to make the seedlings grow too long, the temperature is too low and easy to produce malformed fruit in the future, the suitable temperature is 23 ~ 28 °C. In the temperature should master the following characteristics: If the temperature is high during the day, then the night temperature or the ground temperature should be low; during the day when the temperature is low, the ground temperature should be high. In addition, the low-temperature exercise during the seedling period can enhance the cold resistance of the seedlings, and prevent the seedlings from being leggy and the freezing damage that may suddenly occur after the planting. The temperature of low-temperature exercise is preferably 10°C. Below 8°C, it affects the quality of flower bud differentiation and flower bud formation.

Flowering fruiting period: higher temperature is required, 25-28 °C is appropriate, higher than 33 °C, lower than 15 °C are easy to cause flower drop. This period is easy to encounter low temperatures in the spring and easy to meet high temperatures in autumn, should pay attention to.

Result period: 24~28°C during the day and 15~20°C during the night. During this period, the temperature is too high, especially if the night temperature is too high, it will affect the increase of tomato fruit and accumulation of nutrients, and it is easy to form empty fruit. In addition, fruit coloring is more stringent on the temperature, in the 19 ~ 24 °C is conducive to the formation of lycopene, more than 30 °C or less than 15 °C coloring slow, poor.

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