Is LED plant light really useful for supplementing light in greenhouse vegetables and fruits?
In the past few years, LED plant lights have been recognized by more and more people and have been widely used in agricultural lighting. Compared with traditional plant lights, such as high-pressure sodium lamps, metal halide lamps, etc., LED plant lights have more significant advantages and are widely used in plant factories, greenhouses and other fields.
Planting application of led plant spotlight
Many friends remain cautious and skeptical about whether the led plant light is really effective and how effective it can be. We all know that plants need sunlight for photosynthesis. Without sunlight, plants cannot accumulate more organic matter and cannot grow healthily. If there is sunlight, can plants grow healthily? The sun is too weak in winter, and the sun at noon in summer is too hot, which is not conducive to the growth of plants.
Photosynthesis must have sunlight in order to proceed, but only the weak sunlight in winter will not be conducive to the photosynthesis of plants, or the strong light at noon in summer will also be detrimental to the photosynthesis of plants. This involves the concept of light compensation point and light saturation point. The so-called light compensation point refers to the light intensity when the organic matter accumulated by photosynthesis and the organic matter consumed by respiration reach a balance state under a certain light. The intensity of net photosynthesis is equal to zero, which is not conducive to the growth of plants; the light saturation point is when the activity of photosynthesis reaches the strongest under a certain light, and the light intensity when the light intensity cannot be stronger is under the light saturation point , The most conducive to photosynthesis of plants. If the sun is too hot at noon in summer, it will cause the stomata of the plant leaves to close, stop photosynthesis, and it is not conducive to the growth of plants.
Through LED plant lights, the light intensity can be effectively controlled, so that the plants are always in the most ideal light environment, and the light cycle can be controlled. The light conditions can still be provided in the sunset, which can allow the plants to carry out active photosynthesis for a long time and accumulate Organic matter. It is precisely because of this that plants grow better under the illumination of LED plant lights than under sunlight. The yield and quality have been greatly improved, and the growth cycle has been shortened, and it can be harvested in advance.
In the process of growing vegetables in greenhouses in winter, due to the lack of lighting in the sheds, if no supplementary light measures are taken, not only will the vegetables not achieve the effect of increasing production, but it will even affect the quality of the vegetables and extend the growth cycle of the vegetables. , Will eventually lose the significance of greenhouse vegetable cultivation in winter. LED plant growth lamp is a kind of lamp that simulates sunlight on photosynthesis of plants. It can supplement the light of greenhouse vegetables or even completely replace sunlight. It can increase the yield of vegetables and improve the quality of vegetables. What are the issues that need to be paid attention to when supplementing the light of the vegetables in the greenhouse? What are the skills?
Greenhouse vegetable plant light
1. Reasonable collocation. When planting different varieties and different heights of vegetables in the greenhouse, it is necessary to consider the direction of the sun in the northern hemisphere, according to the principle of north high and south low, reasonable collocation, parallel arrangement of cotyledons when transplanting, and strict cultivation specifications. , The row spacing is consistent, which can make the plants grow neatly and minimize the shading LED plant growth lights between plants.
2. Change the method of scaffolding. When cultivating cucumbers and kidney beans and other racking vegetables in a greenhouse, waste film can be used as a hanging rack instead of the racking, which can effectively improve the utilization rate of light. The method is to insert a 25 cm long bamboo stick along the top of the arch frame and insert a 25 cm long bamboo stick at the root of the cucumber and bean, and then cut the old film into strips and tie it vertically to the bamboo stick and iron wire, when the cucumber and bean are stretched out. After the vine, coil the vine on the old film strip, and then coil it every 5 to 7 days. In addition, if it is necessary to set up a rack, the front row is inclined to the south, the middle row is upright, and the rear row is tilted to the north, which can increase the light utilization rate to about 10%.
3. Keep the shed film clean. It was investigated that a layer of water droplets attached to the canopy film can reduce the light transmittance to 30% to 50%; after the new film is used for 2 days, 10 days and 15 days, the light in the canopy can be reduced to 14% due to dust contamination. 25% and 28%. You should insist on cleaning the surface of the shed. You can tie the soft cloth strips to the wooden poles after the straw curtain is lifted in the greenhouse every morning, and clean the dust and debris on the surface of the plastic film shed from top to bottom, so as to increase the light. More than 30%, but you insist. To reduce the water droplets on the shed film, you can use the shed film to cover; change the irrigation method, use the under-mulch irrigation method and hose for drip irrigation; clean the water droplets on the shed film with a clean rag in the morning; immediately release the air to reduce humidity after irrigation, etc. , Both have very good results. After it snows, the snow on the shed film should be cleared in time to increase transparency and light intake.
4. Uncover the curtains at the right time Properly uncover the curtains early and delay the curtains, which can extend the sunshine time of the greenhouse. The curtains are usually uncovered 0.5 hour to 1 hour after the sun comes out. It is better to cover the curtain half an hour before the sun sets, not too late. The curtain should also be uncovered on a cloudy day, striving for the scattered light to shine. The curtains are generally not opened when it is snowing, and can be opened after the weather turns clear.
5. Utilize the reflective curtain Use a 3 meter long and 2 meter wide aluminum-plated reflective curtain to hang on the upper end of the rear column of the plastic greenhouse, and the lower side is perpendicular to the ground. In this way, the ground can be brightened by about 20%, and to a certain extent, the shed mild ground temperature can be increased, which is beneficial to the healthy growth of vegetables, and improves the yield and quality. In addition, the silver gray film laid on the ground can also increase the intensity of light between plants.
6. Choose the energy-saving plant growth lamp of Yaorong Technology. The plant growth lamp can emit red light with a fixed wavelength of 610nm-720nm and blue light with a wavelength of 400nm-520nm. Among them, the red light with a wavelength of 610nm-720nm can be chlorophyll. Absorbing 75%-85%, the red light of this wavelength has a significant effect on the germination, flowering, and result of plants (seeds), and the synthesis of chlorophyll in plants, and has a significant impact on photosynthesis and photoperiod effects. Blue light with a wavelength of 400nm-520nm. Chlorophyll can absorb more than 90%. It is a strong band for plant growth and photosynthesis. The absorption ratio of chlorophyll and carotenoids is the largest. It can promote the growth and growth of crop roots. Decrease, the leaf and stem become thicker; make the crop strong, and the disease resistance ability is obviously enhanced.
The key to the success of greenhouse vegetable cultivation in winter is to supplement the light. As long as the supplementation of light is done well, other aspects will come naturally, and there will be a big harvest.
