Because of the low temperature in the northern part of China, greenhouses are often used to grow strawberries, so that not only the time to market is long but the supply time is long. Let ’s briefly learn the key points of winter management techniques for strawberries in greenhouses. 1. Do warm and cold protection work Although strawberry has a strong adaptability to temperature, freezing damage will occur if the temperature is lower than -7 ° C. If the temperature drops below -10 ° C, the plant will freeze to death directly. So be sure to do a good job of antifreeze. 2. Temperature, humidity and light 2.1 Temperature management Winter is a key period for strawberry flowering and fruiting in the greenhouse. Low temperature and high temperature have a great impact on strawberries. Effects of low temperature: The low temperature below 5 ° C at night or the strawberry's pistil is damaged and pollination is poor, or the strawberry fruit is cold-damaged and difficult to swell, forming deformed fruit and losing commerciality. During the day, temperature conditions below 15 ° C often induce dormancy of strawberries, which results in retarded growth and development, poor absorption of water and fertilizer, reduced fruit size, and reduced yield. Effects of high temperature: The high temperature above 28 ℃ will affect the pollination of strawberry. If the high temperature above 30 ℃, the pollination rate of strawberry will be severely reduced. What's more serious, the differentiation of the second inflorescence of strawberry will be inhibited and affected. In the later stage of production, even the sunburn disease occurs, leading to the extinction. In the fruit-swelling period, a temperature of more than 25 ° C makes the strawberry fruit ripen too fast and the fruit becomes smaller, which not only has poor commerciality, but also reduces yield. 2.2 Temperature management index The budding period is 25 ℃ ~ 26 ℃ during the day and 10 ℃ at night; During flowering, 23 ℃ ~ 25 ℃ during the day and 10 ℃ at night; Fruit expansion period: 20 ℃ ~ 23 ℃ during the day, 6 ℃ ~ 7 ℃ at night; The harvest period is 23 ℃ ~ 25 ℃ during the day and 5 ℃ at night. Temperature control measures: When the temperature in the shed exceeds or falls below the required temperature, ventilation or cooling should be timely. The measure is that the air can be released three times in a row at 9 a.m., 12 noon, and 2 p.m., and the insulation should be started at 4 p.m. 2.3 Humidity Management The humidity in the greenhouse is closely related to the temperature. When the temperature is low, the relative humidity is high. When the temperature is high, the relative humidity is small. Especially when the flowering is required, the relative humidity is small. Affects the quality of pollination. Humidity control measures: Use high-quality non-drip shed film. When the temperature in the shed is higher than 10 ℃ during the day, the film should be properly peeled to reduce humidity and sealed at night. Cover early and late on a sunny day, and cover early and late on a cloudy day. The concrete surface and ditch are covered with black mulch. The black mulch is conducive to maintaining the humidity of the soil layer and reducing the humidity in the shed. Pay attention to ventilation and humidity after watering. 2.4 Lighting Management Insufficient light in winter will hinder the growth and development of strawberries. In the long run, it will retard strawberry growth and development, slow fruit swelling, poor coloring, and abnormal fruit. Fill light measures: Regularly cleaning the dust on the shed film and timely cleaning the snow on the shed film after snow can enhance the light and increase the shed temperature. After the end of November, you can use the plant fill light to fill the light, morning and evening every day, in the strawberry flowering and fruiting period to ensure that the light reaches 12 to 15 hours per day. 3. Field Management Due to low temperature and insufficient light in winter, the photosynthetic efficiency of strawberries will be relatively low. Proper plant finishing can promote strawberry fruit development, root nutrient absorption, and prevent premature aging. Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone
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