Why to control the national orchid light in the north?

Organic matter comes from photosynthesis. Photosynthesis is done by water and carbon dioxide as raw materials, chloroplasts as factories, and light energy as power (oxygen evolution). Photosynthesis cannot be carried out without power, which shows the importance of light.

It is generally believed that the available light intensity of Guolan is 20%, 30% of the maximum value of natural light, and the highest natural light intensity of Jinan is about 100000 lux, that is to say, the available light intensity of Guolan can not be higher than 15,000 lux. In this regard, the author chooses potted orchids to enter the greenhouse in early December. Because the greenhouse is 5 mm glass, lack of short-wave light. The temperature is high and it is easy to grow, so the potted orchid was moved into the flower pond in early March, and the flower pond was protected from cold with a 0.4 mm plastic film, because the film could penetrate 98% of the ultraviolet rays with a wavelength of 0.4 mi 0.32 microns, and 90% of the ultraviolet rays with a wavelength of 0.32-0.28 microns; the heat transmittance is 84%. It is not only close to natural light and heat preservation, but also can be opened to directly accept weak light of about 10000 lux, thus increasing the utilization rate of light energy and promoting the growth and development of national orchid. At the end of June and the beginning of July, Jinan entered the rainy season, the air relative humidity increased, and then moved the pot orchid into the flower shed, using one or two layers of shading net as appropriate.

Wang Tao of Shandong Academy of Agricultural Sciences