Various types of vegetables have a certain range of temperature requirements, namely, the highest temperature, the lowest temperature and the most suitable temperature. If it exceeds the limit of the highest or lowest temperature it can tolerate, its physiological activities will be hindered and even lead to the death of the plant.
Cold vegetables such as cabbage, spinach, scallion, garlic, etc., the above-ground part can be tolerant to -1 to -2°C for a long period of time, and can tolerate -3 to -5°C for a short period of time. The optimum temperature for growth and development is about 18°C.
Half-cold vegetables such as Chinese cabbage, radish, carrots, peas, broad beans, celery and lettuce, the above-ground part can tolerate low temperatures of -1 to -2°C for a short period of time, and the maximum temperature during the late growth period cannot exceed 20°C, otherwise the growth and development will be poor; The suitable temperature is 15 to 20°C.
Tolerant vegetables such as tomatoes, peppers, eggplants, cucumbers, beans, ginger, etc., whose temperature is lower than 10°C during the growth and development stage will affect flower bud differentiation and flowering results. The optimum temperature for growth is 18-26°C. Pumpkin, wax gourd, gourd, cowpea, bean and other heat-resistant vegetables, below 10 °C, growth is inhibited, the short-term endurance of the maximum temperature is about 40 °C, the optimum temperature for growth is about 30 °C.
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