Necessity of supplementing light in greenhouse
In recent years, with the accumulation and maturity of knowledge and technology, the plant growth lamp, which has been regarded as the symbol of high-tech modern agriculture, has gradually come into people’s view. With the gradual deepening of spectral research, it was found that different wavelengths of light have different effects on different growth stages of plants. The significance of greenhouse interior lighting is to extend enough light intensity in a day. It is mainly used for planting vegetables, roses and even chrysanthemum seedlings in late autumn and winter.
In cloudy and low light intensity days, artificial lighting is necessary. At least 8 hours of light should be given to the crops at night, and the time of light should be fixed. However, lack of night rest time will also lead to plant growth disorder and yield reduction. Under the fixed environmental conditions such as carbon dioxide, water, nutrients, temperature and humidity, the “photosynthetic flux density PPFD” between the light saturation point and the light compensation point of a specific plant directly determines the relative growth rate of the plant. Therefore, an efficient light source PPFD combination is the key to the production efficiency of the plant factory.
Arrangement of light filling time
1. As supplementary light, it can enhance the light at any time of the day, and can extend the effective lighting time. 2. It can effectively extend and scientifically control the light required by plants at dusk or at night. 3. In greenhouse or plant laboratory, it can completely replace natural light and promote plant growth. 4. Completely solve the problem of watching the day and eating at the seedling stage, and reasonably arrange the time completely according to the delivery date of seedlings.
Selection of plant growth lamp
The speed and quality of plant growth can be better controlled by selecting light sources scientifically. When using artificial light sources, we must choose the natural light that is closest to meeting the conditions of plant photosynthesis. Measure the photosynthetic flux density PPFD (Photosynthetic PhotonFlux Density) produced by the light source on the plant, master the rate of plant photosynthesis and the efficiency of the light source, and the amount of photosynthetic effective photon starts the photosynthesis of the plant in the chloroplast: including light reaction and continuous dark reaction.
Example of planting of plant fill lamp of Weizhao Industry in darkroom environment
The plant growth lamp should have the following characteristics
1. Convert electric energy into radiant energy efficiently. 2. Achieve high radiation intensity within the effective range of photosynthesis, especially low infrared radiation (thermal radiation) 3 The radiation spectrum of the bulb conforms to the physiological requirements of plants, especially in the effective spectral region of photosynthesis.
Principles of plant fill light
LED plant fill lamp is a kind of plant lamp, which uses light emitting diode (LED) as the light source and uses light instead of sunlight to create an environment for plant growth and development according to plant growth laws. LED plant light can help shorten the growth cycle of plants. The light source is mainly composed of red and blue light sources. The most sensitive light band of plants is used. The red light wavelength uses 630 nm and 640~660 nm, and the blue light wavelength uses 450~460 nm and 460~470 nm. These light sources can make plants produce the best photosynthesis and make plants get the best growth state. Light environment is one of the essential physical environment factors for plant growth and development. Controlling plant morphogenesis through light quality regulation is an important technology in the field of protected cultivation.
Effects of spectral range on plant physiology
Application and prospect of fill light
With the rapid development of agricultural, industrial and horticultural areas, the light environment control lighting technology for plant growth has attracted attention. Facility gardening lighting technology is mainly applied in two aspects: first, it is used as supplementary lighting for plant photosynthesis when the amount of sunshine is small or the duration of sunshine is short; 2、 As the induced illumination of plant photoperiod and photomorphogenesis; 3、 Main lighting of plant factory.
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Post time: Feb-02-2023
