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Application of LED in plant growth

Jul 15, 2017

This is a plant in accordance with the law must need too much sunlight, and the plant growth lamp is to use the principle of sunlight, sunlight is replaced by light to the plant growth and development of a lamp, can be supplemented by light or completely replace natural daylight, to promote plant growth.

I. BASIC information

Chinese name: Plant growth Lamp

Foreign name: Grow Light

Explanation: Light for sunlight gives plant growth and development environment

Role: Promote growth, extend flowering, improve quality

Grow Light

After application test, the wavelength of plant lamp is very suitable for plant growth, flowering, results, general indoor plant flowers, will grow worse with time, the main reason is the lack of light irradiation, through suitable for the spectrum of the plant to illuminate the LED lamp, not only to promote its growth, but also to extend the flowering period, improve the quality of the flower.

And the application of this efficient light source system to the canopy, greenhouse and other facilities such as agricultural production, on the one hand can solve the shortage of sunlight led to tomato, cucumber and other greenhouse vegetables taste decline, on the other hand can make winter greenhouse eggplant fruit vegetables before and after the Spring Festival, so as to achieve the goal of the anti-season cultivation.

1, as a supplemental light, at any time of one days can enhance the lighting, can extend the effective illumination time.

2, both at dusk and at night, can effectively prolong and scientifically control the light needed by plants.

Loading plant growth Lights

3, in greenhouse or plant laboratory, can completely replace natural light, promote plant growth.

4, completely solve the nursery stage to see the situation of the meal, completely according to the delivery time of the Miao plant reasonable timing.

II. Significance of interior illumination in greenhouse

Grow Lights

What we need to know is that the growth rate of plants depends on the intensity of light, that is, the amount of radiant energy absorbed by the plant surface, not the number of light sources. Many people ask, the greenhouse interior illumination has what meaning, how to do, should choose what light source?

The significance of interior illumination in greenhouses is to extend enough light intensity within one days. Mainly used in late autumn and winter to grow vegetables, roses and even chrysanthemum seedlings. Greenhouse illumination has a great influence on the growth period and seedling quality. Usually the tomatoes, the plant seedlings grow two leaves after the start of the light, continuous light 12 days can reduce 6-8 days of seedling preparatory. But more than 24 hours of light can be a plant growth disorder.

The most appropriate lighting time is 8 hours a day. Artificial lighting is a must when cloudy and light intensity is low. Give the crop 8 hours of light per day at least at night, and the time to light is fixed every day. But lack of night breaks can also lead to plant growth disorders and reduced production.

For tomatoes, the most effective light time is from dusk to midnight, 16:00-24:00 or from midnight to 24:00-8:00. So light 8 hours rest 8 hours. In practice, we should provide illumination to plants throughout the growing period, from seedlings to colonization. In the final period we should reduce the light to 6 hours a day or even stop for 2-3 days, if due to poor lighting conditions, the time required for the planting period is long, usually the light lasts for one months.

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Third, the choice of light source

When using artificial light sources, we have to choose the most close to the natural daylight that satisfies the photosynthesis conditions of plants. The light source should have the following characteristics:

1. Efficient conversion of electrical energy to radiant energy

2. In the effective range of photosynthesis to achieve high radiation intensity, especially the low infrared radiation (thermal radiation)

3. The emission spectra of the bulbs conform to the physiological requirements of the plant, especially in the effective spectral area of photosynthesis.

The comparative strength is in the effective area of photosynthesis, and the energy conversion effect of the sodium lamp is twice times higher than that of the mercury lamp.

Sodium lamps are the most effective light sources in greenhouses that affect plant photosynthesis and correct growth. Tubular sodium lamp can achieve 150lm/w high luminous effect radiation, is the most favorable choice for the growth of various crops at present. Increasing the sodium vapor pressure in the ceramic arc tube expands the spectrum of the blue and red light, which is the high range wavelength sought. In applied and horticultural products, we recommend Plantastar (Osram), Son-t Agro (Philips), and Lucalox XO (GE).

Their difference is to raise the 0-40% Blu-ray range and activate the plant's chlorophyll. In order to achieve the highest radiation energy, all sodium lamps are fitted with reflective layers on the side of the lampshade. At present, most factories in China as a street lamp on the spot as the sodium lamp used, exports, to the vast number of users caused a lot of loss.

IV. Principle

Light environment is one of the important physical environment factors of plant growth and development, it is an important technique in the field of facility cultivation to control plant form by light quality regulation.

The effects of spectral range on plant physiology:

280nm ~ 315nm has minimal effect on morphology and physiology

$number nm~ 420nm Chlorophyll absorption Less, affect photoperiod effect, prevent stem elongation

$number nm~ 500nm (blue) chlorophyll and carotenoid absorption ratio of the largest, the most effect on photosynthesis

nm~ 620nm Pigment Absorption rate is not high

620nm ~ 750nm (red) chlorophyll absorption is "high", which has a significant effect on photosynthesis and photoperiod.

750nm ~ 1000nm low absorption rate, stimulating cell elongation, affecting flowering and seed germination

>1000nm converts into heat

V. characteristics

The wavelength type is rich and coincides with the spectral range of plant light synthesis and light form, and the spectral wave width is half wide, which can be combined to obtain pure monochromatic light and composite spectra. The crop can be irradiated in a balanced light at a specific wavelength, not only to adjust the flowering and fruiting of the crop, but also to control plant height and nutrient composition of plants, the system has less heating and small footprint, it can be used in multi-layer cultivation stereo system, which realizes the miniaturization of low heat load and production space;

Sunshine is a necessary factor for plant growth in addition to nutrition and water. But every grower knows that daylight is beyond control. Thus man-made daylight is increasingly recognized in horticultural cultivation, as artificial daylight can artificially control the season of plant growth and drastically shorten the time for plant growth.

The following uses are used:

1, as a supplemental light, at any time of one days can enhance the lighting, in order to always help plant photosynthesis. Especially in the winter months, can extend the effective lighting time. Both at dusk and at night, it is possible to effectively extend and scientifically control the light required by the plant and be unaffected by any changes in the environment.

2, in the Greenhouse or plant laboratory, can completely replace natural light, to promote plant growth. For the vast majority of growers, the plant sodium lamp and the golden halide lamp are the best light source to replace the sunshine. Gold halide lamp is rich in blue light suitable for the early growth of plant foliage, agricultural sodium lamp rich in red orange, to promote flowering plants have a positive effect.

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VI. Prospects

With the rapid development of the area of facility horticulture in China, the light environment control lighting technology of plant growth has been paid attention. Facilities Gardening lighting technology is mainly used in two aspects:

One, when the amount of sunlight or sunshine time is short, as a supplementary illumination of plant photosynthesis;

Second, as the plant light cycle, light form to build the induced illumination;

III. Main lighting of plant plants.