LU102005B1 - A Photovoltaic LED Intelligent Light Supplement Method for Vegetable Seedling - Google Patents

Abstract

This invention discloses a photovoltaic LED intelligent light supplement method for vegetable seedling, which comprises the following steps: preparation of seedling support, covering of greenhouse film, installation of LED lamp, selection of solar photovoltaic panel, placement of solar photovoltaic panel, control of light supplement time, preparation of seedling tray, seedling substrate, forced germination, sowing and seedling management. This invention can prevent the seedlings from overgrowth, increase the substance content of the seedlings, promote the cultivation of strong seedlings, reduce the occurrence of diseases and insect pests, reduce the application of pesticides, improve the quality of vegetables, and then improve the production efficiency.

Description

A Photovoltaic LED Intelligent Light Supplement Method for Vegetable Seedling LU102005 Technical Field

[001] This invention belongs to the technical field of vegetable breeding, in particular to a photovoltaic LED intelligent light supplement method for vegetable seedling. Background Technology

[002] Seedling is a key link in vegetable production, and the cultivation of strong seedlings plays a decisive role in the successful cultivation of vegetables. Under the conditions of low temperature and weak light in early spring, autumn and winter, the seedlings are often weak and susceptible to diseases, and grow slowly, which restricts the efficient cultivation and off- season production of vegetables. Insufficient light has become the biggest technical problem in vegetable seedling. Therefore, artificial light supplement is used in production to solve the problem of plant overgrowth and weak seedlings caused by insufficient light in the cultivation environment, thus promoting the growth of vegetable seedlings. At present, fluorescent lamp, metal halide lamp and incandescent lamp are commonly used for artificial light supplement. However, these traditional light sources have high heat and energy consumption, and the wave band usable for plants is narrow. Plant leaves can choose the light energy between 400-700 nm for absorption, and the photosynthetic efficiency of blue-violet light band 420-500 nm and red light band 620-700 nm is the highest. LED (light emitting diode) is a new type of supplementary light source, whose wavelength is consistent with the spectral range required for plant growth. The monochromatic colors can be combined to form a spectrum which basically fits the photosynthesis and morphogenesis of various plants, thus improving the utilization rate of light energy.

[003] At present, the following technical defects exist in the light supplement of vegetable seedlings: firstly, fixed power supply is required, so the seedling position is limited. However, most vegetable bases are not connected with power supply, so it is impossible to supplement light; secondly, external power supply is required, which wastes electric energy. In particular, when fluorescent lamp, metal halide lamp incandescent lamp is used for light supplement, the power consumption is high; thirdly, the time of light supplement is not regular, no experiment is carried out for verification, so the effect of light supplement is poor; fourthly, the distribution of light source is unscientific, and the light quality and intensity need to be standardized. LED has the advantages of small size, light weight, long life, special wavelength, low driving voltage, high luminous efficiency, low energy consumption, good safety, reliability and durability, and not being easy to fade. However, at present, there is no systematic application of LED light supplement technology driven by photovoltaic power generation in vegetable seedling. The conventional way of fixed AC power driving limits its popularization and application. 1

Invention Summary

[004] In view of this, this invention provides a photovoltaic LED intelligent light supplement 02008 method for vegetable seedlings for the purpose of the above problems. This method supplements light by using solar photovoltaic power generation and LED strips, and promotes the cultivation of strong vegetable seedlings through the intelligent control of the time of light supplement of the time controller.

[005] In order to solve the above technical problems, this invention discloses a photovoltaic LED intelligent light supplement method for vegetable seedling.

[006] Compared with the prior art, the following technical effects can be obtained by this invention:

[007] 1) Through effective utilization of solar energy resources, LED light supplement can be made on sunny or cloudy days; the method can reduce power consumption, save energy, reduce pollution and protect the environment.

[008] 2) This invention does not require external light source and is not limited by the position of power supply. Light can be supplemented for seedling where there is a vegetable base, and the seedling facilities can be moved and placed on the spot.

[009] 3) This invention can control the switch of LED lamp regularly to achieve the purpose of intelligent light supplement.

[0010] 4) This invention can effectively supplement the red/blue light required by the plant, promote the increase of the substance content of the plant, and improve the growth efficiency of vegetable seedlings.

[0011] 5) This invention can overcome the hostile environmental and climatic conditions of low temperature and little sunshine in early spring in southern areas such as Guizhou, increase the light, carry out light regulation, improve the seedling growth environment, promote early seedling and cultivate strong seedlings.

[0012] 6) The seedling support has the advantages of low investment and high seedling efficiency. The total investment of seedling support materials and photovoltaic panels is less than 1000 yuan (500-600 yuan for PV panels, 200-300 yuan for materials, 100-200 yuan for controller and LED strips), with an annual output of about 10000 high-quality seedlings. If the price is 0.2 yuan per plant, the cost can be recovered in half a year. Moreover, this seedling support can be used for many years after a one-time investment.

[0013] 7) This invention can prevent the seedlings from overgrowth, increase the substance content of the seedlings, promote the cultivation of strong seedlings, reduce the occurrence of diseases and insect pests, reduce the application of pesticides, improve the quality of vegetables, and thus improve the production efficiency.

[0014] Of course, the implementation of any product of this invention does not necessarily need to achieve all the above-mentioned technical effects at the same time.

2

Description of Drawings

[0015] The figures described here are used to provide a further understanding of this inventiorr 102005 and form a part of this invention. The schematic embodiment and its description of this invention are used to explain this invention and do not constitute improper limitation of this invention. Among the figures:

[0016] Figure 1 is the structure diagram of the seedling support of this invention;

[0017] Figure 2 shows the effect of the LED treatment of this invention on the leaf area of tomato seedlings;

[0018] Figure 3 shows the effect of the LED treatment of this invention on stomatal density of tomato seedlings;

[0019] Figure 4 shows the stomata of tomato seedlings treated by this, in which treatment CK represents no light supplement, T1 represents light supplement at 7:00-11:00, T2 represents light supplement at 5:00-19:00, and T3 represents light supplement at 19:00-23:00;

[0020] Figure 5 shows the effect of the LED treatment of this invention on the root activity of tomato seedlings.

[0021] In the figure, 1. Frame, 2. Holder, 3. First support rod, 4. Second support rod.

Detailed Description of the Presently Embodiments

[0022] The implementation mode of this invention will be explained in detail based on the following embodiment, so that the implementation process of how to apply technical means to solve technical problems and achieve technical effects by this invention can be fully understand and implemented.

[0023] This invention discloses a photovoltaic LED intelligent light supplement method for vegetable seedling, which comprises the following steps:

[0024] 1) Preparation of seedling support: the seedling support consists of rectangular frame 1, which is provided with 5-layer holder 2 inside with the layer height of 0.3m and the dimension of

1.2m length x 0.6m width x 1.5m height; each layer of holder 2 is composed of five first support rods 3 and two second support rods 4. The described first support rod 3 is arranged in parallel, and the two ends of the described first support rod 3 are respectively connected to the second support rod 4;

[0025] 2) Covering of greenhouse film: cover a layer of agricultural greenhouse film (anti-fog film or PO film) outside the seedling support, which is wrapped along the edge of the frame to keep out wind and rain and keep temperature and humidity;

[0026] 3) Installation of LED lamp: prepare twelve 1-meter long waterproof LED lamp strips with red/blue light ratio of 4:1, lamp strip density of 60 lamps/m, voltage of 12V and power of 12W.

Fix the LED lamp strips on the first support rod 3 of the seedling support with buckles, and fix three lamp strips on each layer with the spacing of 15 cm; 3

[0027] 4) Selection of solar photovoltaic panel: the power of photovoltaic panel required for each layer of seedling support is >=36W. The specification of photovoltaic panel required for 102005 the whole seedling support = The number of layers of seedling support x The power required for each layer, and 36Wx4 = 144W for four layers. Therefore, it is necessary to purchase solar photovoltaic panels with standard power >=144W;

[0028] 5) Placement of solar photovoltaic panel: place the solar photovoltaic panel on the top of the seedling support or the top of the building with the lighting surface facing southwest and an inclination angle of 45 degrees;

[0029] 6) Control of light supplement time: connect the solar photovoltaic panel and LED strip with wires by using DC12V time control switch for which the circuit diagram is the power supply circuit diagram of conventional solar photovoltaic panel in the field, and set the lighting time to 15:00-19:00 every day of the 24-hour system;

[0030] 7) Preparation of seedling tray: prepare 50-hole or 72-hole (all with dimension 54cm length x 28cm width) seedling plugs commonly used in production. 4 seedling plugs can be placed on each layer. 16 seedling plugs are placed on the 4-layer seedling support. Each seedling support can cultivate 800 strong seedlings (for 50-hole plugs) or 1152 plants (fir 72- hole plugs) per batch;

[0031] 8) Seedling substrate: The special nutrient substrate for vegetable seedling purchased from the market to which there is no need to add other substances;

[0032] 9) Forced germination and sowing: make hot water treatment of the seeds, disinfect the seeds and force germination. When the radicles are exposed, sow the seeds into the seedling plugs containing the seedling substrate;

[0033] 10) Seedling management: arrange the long side of the seedling plugs on the seedling support along the direction perpendicular to the long side of the seedling support, water them regularly, make LED light supplement regularly, and open the greenhouse film from both sides once every 3-5 days for ventilation. When the vegetable seedlings have two leaves and one heart after about 30 days, transplant them, reseed and breed new seedlings.

[0034] In order to make the research of the experiments of this invention and integrate the solar photovoltaic panel LED intelligent light supplement technology system, studies were carried out in different light supplement time periods (7 : 00-11 00,15 00-19 00 and 19 00- 23 00) in seedling of cucumber, tomato and other vegetables in the Horticulture Research Institute of Guizhou Academy of Agricultural Sciences in 2015-2017 by (1) controlling the time of light supplement at night with a combination of solar controller and batteries (2)controlling the time of light supplement in daytime with timing controller. The results showed that: with more than 70% of all days were cloudy and rainy, LED light supplement in different periods had significant effects on fresh weight, plant height, leaf area, stomata, chlorophyll, stomatal density, soluble sugar, soluble protein, root activity, malondialdehyde, 4 proline and other indicators of tomato seedlings. The indicators of strong seedlings after light supplement were as follows: the fresh weight was 81.545% higher than that of the control 102008 group (without light supplement), the leaf area was 30% larger than that of the control group, chlorophyll content, soluble sugar, soluble protein and root activity were higher than those of the control group. The indicators of inferior seedlings were that plant height was about 2.323 cm lower than that of the control group, and malondialdehyde was significantly lower than that of the control group. Light supplement during 15:00-19:00 was the most conducive to the cultivation of strong seedlings, followed by 19:00-23:00, and poor at 7:00-11:00.

[0035] The specific experiment of light supplement effect is as follows:

[0036] 1. The time setting of LED light supplement is shown in Table 1:

[0037] Table 1 Comparative table of test treatment and light supplement time Treatment Light Supplement Time(h) Light Supplement Period CK Ö - i 4 7: 00-11 7 00 2 4 15 : 00-19 : 00 3 4 19 : 00-23 : 00

[0039] 2. Effect of LED light supplement on the growth of tomato seedlings

[0040] 2.1 Effect of LED treatment on the fresh weight of tomato seedlings

[0041] As shown in Table 2, the fresh weight of treatment 2 is 3.689g, which is 81.545% higher than that of the control group, 34.635% higher than that of treatment 1 and 73.437% higher than that of treatment 3. It is significantly higher than that of the control group and treatment 3. The fresh weight of the root of treatment 2 is 1.512g, which is 124.66%, 40.651% and 195.890% higher than that of the control group, treatment 1 and treatment 3. This indicates that LED light supplement treatment can promote the assimilation and absorption of nutrients and promote the accumulation of nutrients in strong seedlings.

[0042] Table 2 Effect of LED treatment on fresh weight of tomato seedlings Treatment Fresh Weight (g) Fresh weight of shoot (g) Fresh weight of root (g) ck 2.032+0.383b 1.583+0.274b 0.673+0.237b 1 2,.740+0.396ab 1.666+0.211ab 1.075+0.199ab (010 SAC) DEP 5

2 3.689+04482a 2206+0.1887a 1.5120.212a LU102005 3 2.1270.209b 1.616x0.228b 0.511x0.100b

[0044] vmmmnnnnnnnmnnmnnçnmmnmnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnÜnnnnünnnnnnnnännnnnÜœñîntÜnçtents

[0045] Note: a and b indicate the difference analysis. The letters between the two treatments are different, indicating that there is significant difference between them.

[0046] 2.2 Effect of LED treatment on the plant height of tomato seedlings.

[0047] As shown in Table 3, the plant height of the control group after treatment is 8.873 cm, about 3.706 cm higher than that of treatment 1, about 2.323 cm higher than that of treatment 2, and about 2.173 cm higher than of treatment 3. The difference is significant. This indicates that the plant height can be significantly reduced by LED light supplement treatment to prevent overgrowth and the effect of treatment 2 is obvious.

[0048] Table 3 Effect of LED treatment on the plant height of tomato seedlings Treatment Plant Height (em) | ck 8.873+£0.861a i 5.167=0.689b 2 6.550+0.602b 3 6.700x0.404b [OOAO] mmm

[0050] 2.3 Effect of LED treatment on the leaf area of tomato seedlings

[0051] As shown in Figure 2, the leaf area of treatment 2, which is 17.417cm°, is the largest, but it has no significant difference compared with 12.167cm° of the control group and 12cm° of that of treatment 3. This indicates that LED light supplement during 15:00-19:00 is beneficial to increase leaf area.

[0052] 2.4 Effect of LED treatment on the stomatal density of tomato seedlings

[0053] It can be seen from Figure 3 that the stomatal density after LED light supplement treatment 1 and 2 is significantly higher than that of the control group, being 285.5283/mm° and

322.0898/mm? respectively, and there is no significant difference between treatment 3 and the control group; as shown in Figure 4, it indicates that LED light supplement treatment during 7:00-11:00 and 15:00-19:00 is helpful for stomata opening of the leaf of tomato seedlings.

[0054] 3. Effect of LED light supplement on physical and chemical properties of tomato seedlings.

[0055] 3.1 Effect of LED treatment on the chlorophyll content of tomato seedlings

[0056] As shown in Table 4, after light supplement treatment, the total chlorophyll content and the content of chlorophyll a of the control group are lower than those of treatment 1 and 3, and significantly lower than those of treatment 2; there is no significant difference between treatment 1, treatment 3 and treatment 2; the content of chlorophyll b of treatment 2 is significantly higher 6 than that of the control group and treatment 1, but not significantly different from that of treatment 3. This indicates that LED light supplement can promote the synthesis of chlorophyir 102005 in tomato seedling leaves, and the effect of light supplement during 15:00-19:00 is better.

[0057] Table 4 Effect of LED treatment at different stages on the chlorophyll content of tomato seedlings Treatment Chioroplwil a(mg'e } Chlorophyll b{ma/2} Chlorophyll {mg/g} ck 0.753+6.070b 0.275+0.025b 1.028+0.095b 1 (.892+0.046ab 0.340+0.009b 1.232+0.053ab 2 1.244+0 200a 0,526+0.074a 1.77040.252a 3 1.001+0.184ab 0.373+0.067ab 1,374+0.251ab

[0059] 3.2 Effect of LED treatment on the root activity of tomato seedlings

[0060] As shown in Figure 5, after 30 days of LED light supplement treatment, the root activity treated by the experiment increases significantly, the root activity of treatment 2, which is

60.272ug/(gh), is largest and significantly higher than that of the control group and treatment 1. This indicates that LED light supplement can improve the root activity of tomato seedlings, and light supplement in treatment 2 and 3 (15:00-19:00) can significantly improve the root activity of tomato seedlings.

[0061] 3.3 Effect of LED treatment on the malondialdehyde content in tomato seedlings.

[0062] As shown in Table 5, after 45 days of LED light supplement treatment, the content of MDA of treatment 2 and 3 is 69.4% and 40.1% lower than that of the control, and it it also significantly lower than that of treatment 1. This indicates that LED light supplement treatment can reduce membrane lipid peroxidation to some extent and improve the stress resistance of seedlings, and the light supplement effect of treatment 2 during 15:00-19:00 is best.

[0063] Table 5 Effect of LED treatment at different stages on the malondialdehyde content (umol/g) of tomato seedlings Treatment Days of Treatment ck 6.488x0.132a 1 7,169+0.192a 2 3,831x0.250b 3 4.632x0.192b [OBA] ————rereemmennmnnnaneannnarrrr enr renr ere EEE

[0065] The above instructions show and describe a few preferred embodiments of this invention. However, as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, and should not be regarded as excluding other 7 embodiments, but can be used for all kinds of other combinations, modifications and environments, and can be modified through the above teaching or technology or knowledge I; 102005 related fields within the scope of the invention concept described herein.

If any modification or alternation made by the skilled in the art does not deviate from the spirit and scope of the invention, it shall be within the protection scope of the Claims attached to the invention. 8

Claims (10)

1. A photovoltaic LED intelligent light supplement method for vegetable seedling | 02005 characterized in that it comprises the following steps: 1) Preparation of seedling support: the seedling support consists of rectangular frame 1, which is provided with 5-layer holder 2 inside with the layer height of 0.3m and the dimension of 1.2m length x 0.6m width x 1.5m height; each layer of holder 2 is composed of five first support rods 3 and two second support rods 4. The described first support rod 3 is arranged in parallel, and the two ends of the described first support rod 3 are respectively connected to the second support rod 4;

2) Covering of greenhouse film: cover a layer of agricultural greenhouse film outside the seedling support, which is wrapped along the edge of the frame;

3) Installation of LED lamp: prepare twelve 1-meter long waterproof LED lamp strips with red/blue light ratio of 4:1, lamp strip density of 60 lamps/m, voltage of 12V and power of 12W. Fix the LED lamp strips on the first support rod 3 of the seedling support with buckles, and fix three lamp strips on each layer with the spacing of 15 cm;

4) Selection of solar photovoltaic panel: the power of photovoltaic panel required for each layer of seedling support is >=36W. The specification of photovoltaic panel required for the whole seedling support = The number of layers of seedling support x The power required for each layer, and 36Wx4 = 144W for four layers. Therefore, it is necessary to purchase solar photovoltaic panels with standard power >=144W;

5) Placement of solar photovoltaic panel: place the solar photovoltaic panel on the top of the seedling support or the top of the building with the lighting surface facing southwest and an inclination angle of 45 degrees;

6) Control of light supplement time: connect the solar photovoltaic panel and LED strip with wires by using DC12V time control switch, and set the lighting time to 15:00-19:00 every day of the 24-hour system;

7) Preparation of seedling tray: prepare seedling plugs, and place 4 seedling plugs on each layer. 16 seedling plugs are placed on the 4-layer seedling support;

8) Seedling substrate: the special nutrient substrate for vegetable seedling purchased from the market to which there is no need to add other substances; 9

9) Forced germination and sowing: make hot water treatment of the seeds, LU102005 disinfect the seeds and force germination. When the radicles are exposed, sow the seeds into the seedling plugs containing the seedling substrate; 10) Seedling management: arrange the long side of the seedling plugs on the seedling support along the direction perpendicular to the long side of the seedling support, water them regularly, make LED light supplement regularly, and open the greenhouse film from both sides once every 3-5 days for ventilation; when the vegetable seedlings have two leaves and one heart, transplant them, reseed and breed new seedlings.

2. The photovoltaic LED intelligent light supplement method for vegetable seedling according to Claim 1 is characterized in that anti-fog film or PO film is used for the described agricultural greenhouse film.

3. The photovoltaic LED intelligent light supplement method for vegetable seedling according to Claim 1 is characterized in that the dimension of the described seedling tray is 54cm length x 28cm width, and the seedling tray is provided with 50 holes or 72 holes. 10