Cultivation strawberry greenhouse promotes temperature management
Contributing to cultivation is a special early-maturing cultivation. Strawberry seedlings are planted in mid-September in Shanghai, and fruit picking can begin in late November until June of the following year. Most of the whole growth period of strawberry is in the winter, flowering and fruiting. Therefore, temperature management is the most important measure for the high yield of strawberry.
The temperature during the strawberry colonization is high, but with the gradual fall of the natural temperature, the temperature should be covered with plastic film in time when the temperature falls below the strawberry's fertility temperature. The appropriate period should be at the daily average temperature of 16°C (Shanghai is about 10 Late in the month to early November, too early and late will affect the yield of strawberries.
In late November, the temperature is already low, and the night temperature in the greenhouse begins to affect fertility. At this time, another layer of endometrium is covered in the greenhouse (specific inner membrane can be used). When the temperature is increased by using a double membrane, the temperature inside the greenhouse can be increased compared with the open air temperature. At 5-6°C, the minimum temperature in the winter season in Shanghai is about -5~-6°C, and the temperature in the greenhouse can be kept above 0°C. When a few years in Shanghai may fall to -7 to -10°C, in this case, measures must be taken to strengthen the insulation, such as temporarily covering the surface of the non-woven fabrics such as triple coverage, the temperature inside the shed can be higher than the temperature outside the shed 12 -13°C. In this cold season when the outside air temperature is -7°C, the minimum temperature in the shed can still be maintained at about 5°C, which can make the strawberry grow normally and result in fruit.
The temperature requirement for greenhouse strawberry growth is 30°C during daytime and 12°C at night, and 25-28°C during nighttime and 10°C during nighttime; 23-25°C during daytime and 8-10°C during nighttime; During the expansion period, it is less than 23-25°C during the day and 6-8°C at night; during the fruit harvest period, it is 20-23°C during the day and 5-7°C during the night, and the minimum is not less than 5°C.
After the shed has brought cultivation into the spring period, the temperature has gradually increased and the temperature in the shed has risen rapidly. At this time, the air temperature will increase and the ventilation volume will be gradually increased to prevent the temperature in the greenhouse from being too high. Otherwise, the strawberry fruit will become smaller and become more acidic.
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