Recently, the smog days in the central and eastern regions have once again hit and lasted for about a week, which has a certain impact on the strawberries grown in greenhouses. The facility agriculture managers should do measures such as artificial light supplementation and heating to reduce the impact of cloudy weather.
According to the monitoring of the Central Meteorological Observatory, since December 20th, there have been sputum in the central and southern parts of North China, Huanghuai, Jianghuai, northern and western Jiangnan, and most of southern China; as of the day before yesterday (December 27), the number of days is generally 1 to 3 days. Among them, Jiangsu, Zhejiang, southern Hunan, Guangxi, Guangdong and other places have 4 to 6 days and 7 to 8 days. In large cities, Beijing has 2 days, Shanghai 2 days, Jiangsu Nanjing 7 days. Nanning, Guangxi, 6 days. Experts said that "from January 1 to 3 next year, the atmospheric circulation situation will be adjusted. As the cold air forces begin to increase, the haze weather is expected to gradually improve after New Year's Day."
When there is cloudy weather in winter, the light in the greenhouse is less than 1/5 of the sunny day, the relative humidity of the air is above 95%, and the indoor temperature is below 15 °C. Severe weather not only limits the photosynthesis of strawberry leaves in greenhouses, but also reduces the photosynthetic products and delays the maturity of strawberries. For example, in the cloudy days of strawberry flowering, it will greatly reduce the fruit setting rate of strawberries and produce deformed fruits, resulting in decreased yield and quality. Bad.
It is recommended that facility agriculture managers strengthen the management of greenhouses in cloudy and foggy weather from the following points: First, increase artificial assisted illumination. An incandescent lamp can be used as a light source for heat treatment, and the second is to properly control temperature. Temporary heating equipment is installed. Heating is generally carried out at night, and short-term ventilation is carried out around noon. The daytime temperature in the control shed is around 20 °C, and the night temperature is above 10 °C. The third is assisted pollination. In the flowering period of strawberry, the bee is used to support pollination, pollination by bees, and spraying the fruit and fruit in the flowering and fruit setting period to enhance the quality of pollen fertilization, and the fruit circulation rate is strong, promoting fruit development, no deformity, no empty shell, no flaws. Granules, good uniformity, improved quality, and fruit and vegetable production. At the same time, the application of the new high-fat film 800 times liquid can play the role of liquid film bagging, does not affect fruit breathing, anti-fruit rust, anti-split fruit, improve fruit surface coloration and brightness, reduce residual toxicity and improve quality.
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