According to the theory of plant development, plant growth can be divided into the following stages:
At this stage, the plants are in the bud, and the temperature and temperature play an important role in the external conditions.
The plant begins to sprout and grow the first few green leaves, and this stage begins, and the water is converted to organic matter by photosynthesis. At this stage, the length of light will directly affect the growth of plants and the formation of plant morphology, especially for the plant's sexual organs - the formation of flower development, plays a key role. Such as Cycads in the northern region of about 10 years to open a flower, the sunshine time in different regions of the south, such as Yunnan, Guangdong area almost every year of flowering; rubber trees almost never developed in Beijing, and often flowering in Indonesia, Malaysia and Hainan regions; in the palm, and will only grow in the Guangdong area, not the result.
After the plant grows to a certain stage, the spectral components begin to play a major role in the growth and development of plants. After a long period of analysis by plant experts, it is found that the effects of spectrum on plant growth are as follows:
Violet and ultraviolet radiation, the wavelength is 300-400nm, is to promote energy plants to produce pigment, and directly affect the formation of D plants and vitamins on phosphorus and aluminum. The accumulation of dry matter and the formation of the stratum.
The blue light, with a wavelength of 440-490nm, can activate the activity of chloroplasts and promote photosynthesis.
Green light and yellow light, with a wavelength of 500-600nm, inhibited the activity of chloroplasts and decreased photosynthesis.
The orange light, the wavelength is 600-700nm, can greatly enhance the photosynthesis, promote plant growth, but excessive and cause excessive growth of plant branches.
At the same time, the absorption spectrum of different plants are different, the maximum absorption is orange red light, blue violet and ultraviolet wavelength followed by 300-500nm, and the wavelength of 500-600nm light emitting less absorption. Different regions of different habits of plants on the light absorption capacity is not the same, hi positive plants generally can absorb more than 80% of the light on the leaf surface, while the negative plants generally only absorb about 60% of the light.
At this stage, light intensity is a key factor affecting plant growth. Spectral content of light gradually relegated to second place on plant growth effect. The role is to promote the development of fruit ripening, such as flower, tomato and other plants, must ensure adequate light intensity to the sun, and.
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