The effect of LED plant growth light on the growth of tomato seedlings, the effect of LED plant growth light on the growth of tomato seedlings
The precise spectrum principle of the new light source of the LED plant growth lamp is used to modulate the light quality, and the tomatoes in the facility are regularly supplemented with light, and the influence of different light quality in the LED plant supplement light on the growth of vegetable seedlings is studied. Table of actual results
Ming: LED red light and red and blue light have significant effects on tomato seedling growth indicators. The stem thickness, fresh dry weight and strong seedling index are significantly higher than those of tomatoes without supplementary light treatment. Red light or yellow light significantly improves the chlorophyll and
Carotenoid content; red light or
Red and blue light significantly increase the soluble sugar content of tomatoes. Therefore, supplementing red light or red and blue light at the seedling stage can promote the growth of tomato seedlings, which is beneficial to the cultivation of strong seedlings, but it needs to be based on reasonable light supplementation strategies and benchmarks.
In the facility cultivation in most parts of my country, the cultivation of vegetable seedlings in winter and spring is at low temperature and weak light. Some cold-proof and heat-preservation measures have reduced the light intensity and changed the light intensity.
, Affect the healthy growth of seedlings, directly affect the yield and quality of products.
LED plant lights have outstanding advantages such as pure light quality, high light efficiency, rich wavelength types, convenient spectral energy modulation, and environmental protection and energy saving. It is a new type of LED light source used for plant cultivation instead of fluorescent lamps. In recent years, the application
Environmentally-friendly and energy-saving plant LED lights have gradually attracted attention to the light environment regulation technology to promote plant growth and development. Foreign scholars have found through research that monochromatic LED or combined LED light quality control has an effect on spinach, radish, lettuce,
The morphogenesis and photosynthesis of beet, pepper, perilla and other plants have different effects, which can achieve the purpose of improving photosynthetic efficiency, promoting growth and regulating morphogenesis. Some domestic scholars have studied the effect of LED light quality on cucumber,
The influence of tomato, colorful sweet pepper, strawberry, rape and other plants on the growth of plants confirmed the special effect of light quality on the growth of plant seedlings. However, since most experiments use ordinary electric light sources or filters to obtain light quality, it is impossible to quantitatively and accurately adjust the light quality.
Control the spectral energy distribution.
Tomato is an important vegetable type in my country's planting cultivation. The change of the light environment in the facility has a great impact on the growth and development of its seedlings. The use of LEDs to precisely control light quality and light quantity, and compare the effects of different light quality supplementary light on the growth of tomato seedlings, aims to provide help for the reasonable regulation of the light environment of vegetable facilities.
The experimental materials were two varieties of tomato "Dutch Red Powder" and "Israel Hongfeng".
Each treatment is equipped with 6 LED plant growth lights, and a reflective film is installed between each treatment to isolate. Supplement light for 4 hours every day, time is 6:00-8: 00 and 16:00
18: 00. Adjust the distance between the LED light and the plant so that the vertical height of the light from the ground is 50~70cm. The plant height and root length were measured with a ruler, the stem thickness was measured with a vernier caliper, and the stem thickness was measured at the base of the stem. For
Samples of seedling plants of various varieties are randomly sampled, with 10 plants drawn each time. The strong seedling index is based on the method of Zhang Zhenxian (Strong seedling
Index=stem thickness/plant height×whole plant dry mass) calculation; chlorophyll was extracted and determined with 80% acetone; root vigor was determined by TYC method; soluble sugar content was determined by anthrone colorimetry.
results and analysis
The effect of different light quality on the morphological indexes of tomato seedlings, except for green light, the strong seedling index of tomato "Israel Hongfeng" seedlings was significantly higher than that of the control, the order was red and blue light>red light>yellow light>blue light; all light quality treatments Fresh and dry
The weight index was significantly higher than that of the control, and the red and blue light treatment reached the maximum; except for the green light and blue light, the stem thickness of the other light quality treatments were significantly higher than that of the control, followed by red light>red and blue light>yellow light.
Tomato "Dutch Red Powder" responds slightly differently to light quality treatment. In addition to the green light, the tomato "Dutch Red Powder" seedlings
The index of strong seedlings was significantly higher than that of the control, in the order of blue light>red and blue light>red light>yellow light; the fresh and dry weight indexes of all light quality treatments
The standard was significantly higher than the control, and the red light treatment reached the maximum; the stem thickness of all light quality treatments was significantly higher than that of the control, followed by red light treatment.
Light>Yellow>Red and Blue>Green>Blue. Comprehensive analysis of various indicators, the supplement of red, blue and red light has a significant effect on the growth of the seedlings of the two tomato varieties, and the stem thickness, freshness, dry weight and strong seedling index are significantly higher than those of the control. But the variety
There is a slight difference between. Tomato "Israel Hongfeng" under the red and blue light treatment, its fresh weight, dry weight and strong seedling index reached the maximum, and there was a significant difference with other treatments; tomato "Dutch Red Powder" under the red light treatment. Its strain
The height, stem thickness, root length, fresh weight, and dry weight all reached the maximum, and there were significant differences with other treatments.
Under red light, the plant height of tomato seedlings was significantly higher than that of the control. Red light plays an important role in promoting stem elongation, increased photosynthesis rate and dry matter accumulation. In addition, supplementing red light also significantly increases the root length of tomato "Dutch red powder", which is similar to the research on cucumbers, indicating that red light also promotes The role of hair roots. Under the supplement of red and blue light, the strong seedling index of the three vegetable seedlings was significantly higher than that of the control.
The combination of red and blue LED spectrum has a positive effect on the growth and development of plants, which is better than monochromatic light treatment. The effect of red LED on the growth of spinach is not obvious, and the growth morphology index of spinach is significantly improved after adding blue LED. Red and blue
The bioaccumulation of sugar beet grown under the combined light of LED spectrum is the largest, betatin accumulation in the hairy root is the most significant, and the highest sugar and starch accumulation are produced in the hairy root. Some studies believe that the combination of red and blue LED lights can pass
Increasing the net photosynthetic rate to improve plant growth and development is because the spectral energy distribution of red and blue light is consistent with the absorption spectrum of chlorophyll. In addition, supplementation of blue light has different effects on the fresh weight, dry weight and strong seedling index of tomato seedlings.
The positive impact of the degree. Blue light irradiation at the seedling stage can also promote the growth of tomato seedlings, which is beneficial to the cultivation of strong seedlings.
This study also found that supplementing with yellow light significantly increased the chlorophyll and carotenoids content of tomato "Israel Hongfeng". The research results show that green light promotes the rapid growth of Arabidopsis thaliana chlorosis seedlings, and it is believed that there is a new light activated by green light.
The signal promotes stem elongation and antagonizes growth inhibition.
The many conclusions obtained in this experiment are similar or the same as those of the predecessors, confirming the special status of LED spectrum in plant growth. The effect of light quality on the nutritional morphogenesis and physiological characteristics of plant seedlings is significant, which makes a living
In production, the supplementary light quality is used to cultivate strong seedlings to provide theoretical basis and feasible technical parameters. However, LED supplementary light is still a very complicated process. In the future, it is necessary to systematically explore the energy (light quantum density) of different spectra (light quality).
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