Different tree species and varieties need cold energy to determine the initial stage of warming, such as peach (such as dawn nectarine), which can be closed in early December; plum, which can be closed in mid December; apricot, which can be closed in late December.
Local comprehensive consideration is given to the completion time of natural dormancy and the success of non warming production of corresponding tree species. If possible, determine the appropriate time to close the shed; grapes (such as Jufeng grapes) can generally start to close the shed in early December; semi convenient strawberry cultivation generally starts to close the shed from November to December for heat preservation. Of course, on the premise of meeting the cooling capacity, the heating start-up time can also be determined according to different target time to market. The temperature of fruit trees in the facility should be increased gradually. First, pull out 1 / 3 of the straw in the daytime, then pull out 1 / 2 of the straw, and finally pull out all the straw. The whole process lasted 7 to 10 days.
Light is one of the important environmental factors that affect the growth and development of crops. According to the experience of Dutch greenhouse growers, 1% of the light increased the yield by 1%, which shows the importance of light in crop production. Due to various factors, the lack of light in greenhouse will affect the growth, yield and quality of greenhouse crops. At this time, light has become a limiting factor in crop production, and artificial light supplement in greenhouse will be an inevitable choice.
All kinds of crops in the greenhouse will cause serious light shortage due to the short light in winter and cloudy days, rain, snow, fog and other weather; in the continuous rainfall of greenhouse crops in the south, the phenomenon of light shortage will also appear in the plum rain climate, which will lead to the crops unable to photosynthesis normally. Plant growth lamp can supplement light scientifically and reasonably. It is suitable for all stages of plant growth. It can make the plant leaf thick, root system developed, grow well, strengthen the resistance and immunity, promote the plant precocity, increase production, improve the quality of fruit. It can also inhibit the growth and reproduction of bacteria and eggs in the shed, reduce the use of pesticides, reduce the pollution of the environment and crops, which is in line with the current "green" trend.
Through application test, the wavelength of laser lamp is very suitable for plant growth, flowering and fruiting. Generally, the fruit trees in the shed will deteriorate with the passage of time. The main reason is the lack of light. The laser irradiation suitable for the spectrum of fruit trees can not only promote the growth of fruit trees, but also extend the flowering period and improve the quality of flowers. The application of the high-efficiency light source system in the greenhouse, greenhouse and other agricultural production facilities can not only solve the problem that the taste of fruits in the greenhouse such as peaches and grapes decreases due to the lack of sunlight, but also greatly reduce the light intensity of the greenhouse in winter. Fruit trees will be listed 10 - 15 days in advance to achieve the purpose of anti - season cultivation
