Pay attention to ventilation. Use the size of the air vent to control the ventilation. After pulling for 20 minutes in the morning, when the temperature in the shed slightly rises, you can ventilate for a short time. Open the top air vent with a slit of about 5 cm, and ventilate for about 10 minutes, and then close immediately. The air vents warm the greenhouse. When the highest temperature reaches 28 ~ 30 ℃, start the second ventilation, and close the air outlet when the temperature reaches 22 ℃. At this time, the size of the air outlet to be released should be determined according to the actual situation. The principle is that it should be small and not large to ensure the ventilation time.
According to the thermal insulation characteristics of the respective greenhouses, the time of the cover is determined. Taking the current high-insulation daylight greenhouse as an example, it should be released at about 5 pm. The temperature of the greenhouse at this time is about 8 ° C, and the temperature the next morning can be maintained at about 5 ° C. If the temperature during exposing is too high, it is necessary to delay the exposing time and wait for the temperature to drop to 8 ° C. You can also leave a few centimeters of air at the upper vent during exposing. The management of the greenhouse should be based on the characteristics and characteristics of its own greenhouse, the needs of strawberry growth and changes in the external environment. The greenhouse with poor thermal insulation effect should be covered early.
Management of rainy and snowy days is the key to winter management of strawberries in greenhouses. When watering, pay attention to the changes in the weather. Do not water or spray medicine on cloudy days. If you must use medicine, you should use fumigants or dust. On a cloudy day, you should put a small wind for a short time to ventilate the greenhouse and replenish fresh air. Rain In the snowy days, you should "steal" time and look for opportunities to let the wind go; when it rains, don't let go. In mid-to-snow days, you can wait for the snow to stop after the snow is cleared. In the winter, when the wind is blown to the greenhouse, only the top air vent can be set, and the bottom wind and waist wind must not be opened.
Strengthen water and fertilizer management according to weather changes. Always pay attention to the weather changes that day, and at the same time, do not water or fertilize in rainy or snowy days. In mid-December, strawberries grow rapidly. Make sure to water the plants once a week and fertilize them every two weeks. Watering should be relatively sufficient. Every 15 to 20 days, apply phosphorus and potassium fertilizer to the roots, each time applying 40-50 kg of potassium dihydrogen phosphate per acre, or applying 70-80 kg of rotten beef or pork bone meal, diluted 80 to 100 with water. After doubling the roots, or drip irrigation with topdressing. Fertilization and watering time should be from 9 am to 11 am, to prevent watering in the afternoon to ensure that the ground temperature is restored as soon as possible.
Pay attention to calcium supplements. After the strawberry enters the rapid growth period of flowering and fruiting, the edges of the new leaves of the strawberry are often black and dry, the leaves are wrinkled, and the young fruits are dry. This is not a symptom of viral disease, but a physiological calcium deficiency. It is recommended to add 2 to 3 kg of Genli calcium per acre when watering, once every 15 to 20 days in winter, and once every 10 to 15 days after the Spring Festival; spray foliar spray with Axi Calcium Boron or Axi Magnesium 500 times more calcium, Strawberry fruit parts should be sprayed evenly. The use of calcium fertilizer can increase the hardness of the fruit to a certain extent, especially the two varieties of Hongyan and Zhang Ji should pay more attention to the application of calcium fertilizer.
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