With the advent of deep winter season, the temperature has gradually decreased, and wintering tomatoes cultivated in greenhouses are facing a cold test. Tomato is a thermophilic crop that is vulnerable to low temperatures or frost during winter and spring cultivation. If the greenhouse temperature is 5 to 10°C for a long time, the leaves of the plants will be dark green or immersed in water. In a low temperature environment below 5°C for a long time, the leaves of plants will be bleached due to chlorosis.
To prevent tomato cold damage, it is necessary to strengthen the insulation of greenhouses on the basis of selecting cold-resistant, low-temperature-resistant and low-light varieties, such as thickening the earth wall, increasing the density of the blanket, and deducting small arches. In case of sudden drop in temperature, temporary heating measures such as coal-fired boilers should be adopted. If necessary, a mixture of brown sugar and potassium dihydrogen phosphate can be sprayed.
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