Light is one of the core elements of plant growth. Light as an environmental signal, through the photon density (light intensity, light quality (spectrum) and sunlight (photoperiod), all stages of plant growth and development have very important influence, and build the microclimate environment meet the demand of crop photosynthesis, is to improve the accumulation of photosynthetic efficiency, to accelerate the matter, the key to improving its yield and quality, transformation and upgrading of facilities horticulture industry and mass transfer efficiency plays an important role.
Winter sunlight lasts less than seven hours, which is not enough for facility farming in the north, so many places rely on artificial lighting to extend the duration. With LED lamp as the light source, a set of supplementary light system is established, which limits a supplementary light time range according to the time required by the plant. Take tomatoes for example, 24 hours is a cycle, 14 hours of day, 10 hours of night, add a light sensor on this basis, if there is no sun on a cloudy day, the effective light decreases, at this time the light will automatically turn on.
Based on the full understanding of rare earth elements and a large number of experiments, rare earth elements are added to the light source on the basis of LED light, and different light sources are combined according to the photosynthetic requirements of different crops to form supplementary light array, making it possible to regulate multiple characteristic bands needed for photosynthesis of crops on demand.
According to the introduction, the agricultural light source of rare earth is mainly to let the rare earth luminescent materials under the action of different luminescent materials and compounds, through electric excitation to produce different bands of spectrum. The difference between the new technology and ordinary artificial light supplement technology is that the spectra of rare earth luminescent materials are more accurate.
"For example, I want red light, but because it's a wide spectrum, it might include orange light, maybe even yellow light, and for plants, you don't need as much yellow or orange light. In the artificial lighting process involving rare earth elements, the spectrum is very accurate. It can locate the spectrum of the band we want. Rare earth luminescent materials also have the advantage of being highly efficient in converting nearly 90 percent of electricity into light. Plants absorb most of the light energy, which greatly improves the efficiency of light absorption."
If ordinary tomatoes do not fill the light, the maximum time of natural light is only 7 hours, the seedling stage will be very long, generally more than 60 days before flowering, the growth period will be very long, naturally also affect the yield.
"If you get 14 hours of rare earth light a day, tomatoes can bloom in 40 to 50 days. Moreover, the flowering and fruit dates of artificially tinted tomatoes were earlier than those without tinted tomatoes. The fruits of tomatoes have a period of color transition from green to red. If the light time is insufficient, the period of color transition of plants will be prolonged. By contrast, tomatoes with a light supplement can be sold in 90 days, while tomatoes without a light supplement are needed Over 120 days. "For agriculture, a reasonable time lag is a good way to increase economic income."