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Planting experience of LED plant lights in greenhouse vegetables

2021-09-1311

1. Introduction to the principle of LED plant lights in greenhouses:


Light has a close relationship with the growth of crops. The maximum capture of light energy and the full use of the potential of plant photosynthesis will directly affect the benefits of agricultural consumption. In recent years, due to the advancement of market demand, greenhouses have been widely used to consume anti-season flowers, fruits, vegetables, etc. Due to the short sunshine time in winter and spring, the slow growth of crops and low yields, it is urgent to stop lighting.


The northern part of China is mostly located in eastern Asia and has a temperate monsoon climate. In winter and spring, affected by the cold air of Siberia going southward, sometimes it forms rain and snow due to the fusion of cold and warm air. There are as few as 1 to 3 days of low temperature and ignorant weather, and as many as 7 to 8 days of continuous overcast and ignorant weather.

  

According to statistics from the Beijing area in the past 50 years, the probability of this long-term continuous shady weather is about 20%, 40% in the past 10 years, and twice in the past 3 years, which is more than 60%. This means that Beijing’s continuous shadows in winter and spring are becoming more and more serious, and it has become a serious catastrophic weather for maintenance land consumption in winter and spring.

  

(1) When the light intensity is lower than its compensation point, the consumption of organic matter is more than the accumulation, and the dry mass of the plant drops, and even death. Even under the condition of low light, the growth of the plant is weak and prolonged.


(2) Affect flowering and fruiting. Solanaceous fruits, melons and vegetables have certain requirements for light time and intensity. If the light time of watermelon is less than 11 hours, all the young fruits will be scattered. Vegetables that require moderate light intensity, such as peas, kidney beans, celery, radishes, green onions, etc. Vegetables that require weaker light intensity, such as lettuce, spinach, chrysanthemum, ginger, etc., require lower light intensity.

  

Solanum and fruit vegetables are consumed in solar greenhouses in Beijing. Even in sunny conditions, the light intensity cannot reach the light saturation point due to the reduction effect of the plastic shed, but it can reach the light compensation point (this is also consumed by the solar greenhouse). The reason for the weak taste of solanaceous vegetables).

  

Under cloudy and cloudy conditions, the light is even more lacking, the light intensity is not enough, the light time is short, and the compensation point cannot be reached. Therefore, photosynthetic efficiency dropped sharply, dry matter accumulation decreased rapidly, and diseases increased rapidly, and the loss was a foregone conclusion.


(3) According to the conclusion of research and consumption theory, we generally classify disasters into three levels for the classification of disaster levels.


1. Light: 3 consecutive days without sunshine; or 3 days without sunshine during 4 consecutive cloudy days, when cucumber, tomato, pepper and other blights and downy mildew begin to appear.

2. Intermediate: 4-7 consecutive days without sunshine; or sunshine duration <3 h for more than 7 consecutive days; or 2 light-level ignorance in 1 month. At this time, cucumber, tomato, pepper and other diseases generally occur, but after Measures such as chemical control can still be controlled.


3. Heavy continuous cloudy days ≥ 8 days; or sunshine duration <3 h for more than 10 consecutive days; or 2 intermediate low-level photos within 1 month, at this time 10%-20% diseases are difficult to control, and most of them show a reduction in production. And continue to develop.


The Guanpu that plants can absorb is mainly red and blue. The LED plant growth lamp is the application of red and blue spectrum to synthesize the spectrum technology required for plant photosynthesis, directly supplementing the * required lighting technology for plants, and all things grow by the sun. What is needed for growth is the spectrum that fits it.


In winter, there are more continuous cloudy and hazy days, and lack of light in the shed often leads to serious lack of nutrition in vegetables, growth stagnation, and frequent physiological diseases. Therefore, certain measures must be taken in supplementing light to maintain a certain intensity of photosynthesis. , To ensure the normal growth of crops, but many vegetable farmers have many misunderstandings when supplementing light in winter. Next, the editor will talk to you about the misunderstandings and precautions of growing vegetables in greenhouses in winter!


Don't pay attention to the dust removal of greenhouse film


Many vegetable farmers think that the dust removal effect of the shed film is minimal and has little effect on the light of the shed film, so they rarely clean the dust on the shed film. In fact, many sheds, especially large sheds near the roadside and the road surface is not hardened, are dusty every day, and prolonged gatherings cause dust to be covered on the shed film, which greatly reduces the light transmittance of the shed film and has a great impact on the vegetables in the shed. . Therefore, it is recommended that vegetable farmers should regularly dust the shed film. Even the sheds equipped with dust removal cloth strips should be cleaned regularly. After all, the dust removal cloth strips cannot clean the entire canopy film.


Full greenhouse hanging reflective film


The role of the reflective film in the greenhouse is in full view. It increases light and temperature during the day, especially when the light is weak. However, many vegetable farmers like to hang the reflective film in the whole shed when using the reflective film, that is, hang the reflective film on the entire wall. It reflects the light to the maximum, but it affects the persistence of the temperature of the shed at night. Since daylight does not reflect on the wall, the wall cannot absorb and store enough heat, and it cannot dissipate heat at night to maintain the shed temperature, resulting in night temperature. Overcoming low, vegetable growth is affected. Therefore, it is recommended to choose a width of 1-1.5 meters when the reflective film is hung on the back wall, and choose a suitable position according to the height of the plant.


Unreasonable use of LED plant lights in greenhouses


Some vegetable farmers only choose incandescent lamps when supplementing light. Although this type of lamp can increase the temperature of the shed, it can only provide red and orange light for vegetables and lack the blue-violet light required for plant growth. Therefore, it is recommended that vegetable growers choose special lamps in the selection of supplementary light. The LED plant light improves the light effect. If it is used in the nursery shed, it is necessary to supplement the light and increase the temperature, then it can be used together with an incandescent lamp and a special supplementary light.


Second, what are the standards for good LED plant lights


The important part of the composition of the LED plant lamp beads, the materials used from the shell radiator to the power supply all determine the product's service life and brightness and other quality issues. You get what you pay for, and cheap plant fill lights are not only ineffective, but also easy to break. Why? Because the information is poor, it is cheap, and it will not be effective.


Why is the effect bad? Since the role of LED plant lights is to replace sunlight to provide the light source needed for the growth and development of greenhouse plants, it takes time to experiment to find the spectrum required for suitable plants. Do you think the spectrum is really suitable for plant growth? Would it be so worthless?


The composition of the led light source is partially composed of chips, brackets, power supplies, gold wires and other materials, and the prices of different materials are also very different. The conductivity of metal materials determines the quality of the product, and cheap materials are naturally not suitable for industrialized indoor plant cultivation. Since the factors that determine the plant's supplementary light effect are very simple, the appropriate spectrum is available, but if you want to reach the peak of the light, the power is the key point.


However, materials with poor conductivity require more heat to reach that power. Anyone who has studied physics knows that metals with poor conductivity have higher resistance and lower melting point. If you haven't reached that power, your light will be broken if you haven't played the role of supplementary light. Think about how cost-effective this is.


LED plant light products are different but the quality is also uneven. While considering the supplementary light effect, safety certification issues, lamp warranty period and after-sales service conditions must also be considered. Shenzhen Yaorong Technology Co., Ltd. is a professional R&D, production, A company that sells LED plant lights has 12 years of quality precipitation that is worth choosing.


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