CN103947525A - Method for carrying out lettuce indoor production by utilizing light source of LED (Light-emitting Diode) - Google Patents

Abstract

The invention discloses a method for carrying out lettuce indoor production by utilizing a light source of an LED (Light-emitting Diode) and belongs to the technical field of vegetables. The method comprises the following steps: after a lettuce seed is sprouted for 2-3 days, directly seeding on the substrate surface of square sponge, hydroponically culturing in nutrient solution till 2 main leaves are generated, then seeding into a planting hole in a foam board floating in a hydroponic tank after a lettuce young seedling is wrapped by the sponge, putting under the LED with a ratio of blue, red and yellow being 8:1:1 and hydroponically culturing for 40 days in the nutrient solution. The light source of the LED with the ratio of blue, red and yellow being 8:1:1 is most suitable for the growth of lettuce. The method has the advantages of simplicity in operation, rapid plant growth, strong plant, energy saving, environment protection and the like and can be applied to industrialized production of indoor rapid seedling nursery, cultivation and planting of the lettuce and other fields.

Description

A method for indoor production of lettuce using LED light source

technical field

The invention relates to a method for indoor production of lettuce by using an LED light source, and belongs to the technical field of vegetables.

Background technique

Hydroponic vegetables refer to vegetables whose roots grow in layers of nutrient solution and only provide water, nutrients, and oxygen through nutrient solution, which is different from traditional soil cultivation. Hydroponic vegetables have a short growth cycle and are rich in a variety of vitamins and minerals necessary for the human body. Lettuce, also known as lettuce, belongs to the genus Lactuca in the Compositae family and is the main species of hydroponic vegetables. Lettuce has high nutritional value and is mainly eaten raw. It is an indispensable vegetable for cold salads and hamburgers. In recent years, it has become a common vegetable in the homes of ordinary people in big cities in my country. It can be eaten raw, stir-fried, and hot pot. However, there is no mature and reliable technology for the provision of light sources for indoor production of lettuce.

Light is one of the most important environmental factors affecting plant growth and development in nature. It not only provides energy for plant photosynthesis, but also acts as an environmental signal to regulate the entire life cycle of plants. With the advancement of science and technology and the rapid development of agriculture and biological industries, the use of effective light by plants has broken through the limitation of relying solely on sunlight, and artificial light sources have become an important means of environmental control of plant growth and development. The artificial light sources used in agriculture and biology for a long time mainly include fluorescent lamps, incandescent lamps, sodium lamps, and dysprosium lamps. Among them, high-pressure sodium lamps and dysprosium lamps are light sources with high luminous efficiency and effective photosynthetic efficiency, but they consume a lot of power and emit spectrum. It cannot be well matched with the photosynthetic absorption spectrum of plants, and the efficiency of supplementary light is low; and it produces a lot of heat radiation, which cannot be close to the plants, and the light excitation efficiency for plant growth is not high, and the cost of artificial light sources is very high. Therefore, the introduction of new light sources with energy saving, good luminous performance, low heat production and long service life is of great significance to improve the utilization rate of electric energy and space in plant factories and reduce the cost of power consumption.

A new type of high-efficiency energy-saving light source-light-emitting diodes (light-emitting diodes, LED), as a semiconductor light source that can be used for plant illumination, has attracted increasing attention. Compared with fluorescent lamps or high-pressure sodium lamps commonly used at present, LED is a device that can effectively convert electrical energy into electromagnetic radiation, and has the following advantages: use direct current, low power supply voltage; small size, compact structure, and stable performance ;Wavelength is fixed; cold light source can irradiate plants at close range and improve space utilization; energy saving and high efficiency, high photoelectric conversion efficiency, low heat generation and small cooling load, power consumption is only one-eighth of incandescent lamps, fluorescent lamps 1/2 of that; the light energy utilization rate can reach 80% to 90%, and different light quality and luminous intensity can be controlled separately, and the energy saving effect is remarkable; the light amount can be adjusted, which can increase the cultivation amount per unit area; it is allowed to provide high-frequency intermittent Lighting mode; the light quality can be adjusted, and it can emit monochromatic light with a narrow light wave, and can be combined arbitrarily according to different needs; impact resistance, not easy to break, mercury-free, non-polluting, waste can be recycled, in line with agricultural production Actual; long life, its service life is dozens of times that of ordinary light sources, and its strong durability reduces operating costs. Therefore, using the performance characteristics of LEDs to develop artificial light sources required by plants will greatly improve their light energy utilization efficiency.

This method explores the indoor production test of lettuce using LED light sources, and establishes a complete and feasible test method. The operation steps are simple, and the test effect is stable and clear. Therefore, it can be obtained in actual production, scientific research, testing and student tests. good application.

Contents of the invention

The purpose of the present invention is to provide a technical solution for indoor production of lettuce using LED artificial light source, so as to facilitate the application in indoor lettuce seedling production and scientific research.

Technical solutions

A method for indoor production of lettuce using LED light sources, comprising the following content:

1. Preparation of seedlings: After 2-3 days of germination, the lettuce seeds are directly broadcast into the sponge square matrix, and cultivated in nutrient solution hydroponically until 2 true leaves are formed.

2. Illumination treatment: Wrap the lettuce seedlings with 2 true leaves with a sponge, plant them in the planting holes on the floating foam board in the hydroponic tank, and place them under the combination of blue, red and yellow 8:1:1 LEDs for 40 days.

3. Conditions of light treatment: the light intensity is 50 μmol·m ^-2 ·s ^-1 , the photoperiod is 12 hours, the culture humidity is 60±10%, and the culture temperature is 16-20°C.

4. Control method:

1. The light source of the light treatment is a group of light-emitting diode lamps (LED);

② The light intensity is controlled by adjusting the number of lamps and the distance from the lamp to the plant canopy;

③ The photoperiod is controlled by a timing device.

5. The lettuce is heat-resistant lettuce.

Beneficial effect

The invention provides a method for indoor production of lettuce by using LED artificial light source. The artificial light source seedling raising technology of the present invention has the following advantages: 1) simple operation and good effect; 2) energy saving and environmental protection; 3) fast and robust plant growth. The method and results of the invention provide a reliable technical solution for indoor production of lettuce, and also provide a good platform for vegetable research of lettuce.

Description of drawings

Figure 1, the ascorbic acid content under the combination of blue, red and yellow at 8:1:1 is greater than that of the control treatment.

Figure 2, the photosynthetic product under the combination of blue, red and yellow at 8:1:1 is higher than that of the control treatment.

Detailed ways

The present invention will be further described in detail through specific embodiments below. The methods used in the following examples are conventional methods unless otherwise specified, and the percentages are volume percentages unless otherwise specified.

1. Implementation materials:

① Lettuce seeds: heat-resistant type (species for production).

②Light source: light emitting diode (LED).

2. Implementation method:

①Preparation of seedlings: After 2-3 days of germination, the lettuce seeds are directly broadcast into the sponge square matrix, and cultivated in nutrient solution until 2 true leaves are grown.

② Light treatment: Wrap the lettuce seedlings with 2 true leaves in a sponge, plant them in the planting holes on the floating foam board in the hydroponic tank, and then place them under the combination of blue, red and yellow 8:1:1 LEDs for cultivation.

③Condition control: In the light treatment stage, the light intensity is 50 μmol·m ^-2 ·s ^-1 , the photoperiod is 12 hours, the culture temperature is 16-20°C, the culture humidity is 60±10%, and the culture time is 40 days.

④ Control method: Light-emitting diode (LED) lamps provide light source, the light intensity is controlled by adjusting the number of lamps and the distance from the lamp to the plant canopy, and a timing device controls the photoperiod.

3. Processing effect:

①Effects of different light sources on ascorbic acid (Vc) in lettuce leaves

The content of ascorbic acid in lettuce was significantly higher under the combined light of blue, red and yellow than that under the fluorescent light. The combination of blue, red and yellow light is beneficial to the accumulation of ascorbic acid in lettuce leaves (Fig. 1).

② Effects of different light sources on photosynthetic products of lettuce

The content of soluble sugar and sucrose in lettuce was the largest under the combined light of blue, red and yellow. The results showed that the combination of blue, red and yellow light was more conducive to the accumulation of photosynthetic products (Figure 2).

Claims (4)

1. utilize LED light source to carry out a method for romaine lettuce indoor production, comprise following content:

1. the preparation of seedling: romaine lettuce seed, after vernalization 2-3 days, lively enters in sponge square matrix, is cultured to 2 true leaves at suspension culture;

2. light treatment: the romaine lettuce seedling of 2 true leaves is cultivated 40 days with being positioned in the implantation hole being sown into after sponge wrapping on cystosepiment floating in water planting groove under blue reddish yellow combination 8:1:1LED again.

2. method according to claim 1, is characterized in that: the condition of described light treatment: light intensity is 50 μ molm ^-2s ^-1, the photoperiod is 12 hours, cultivation temperature 16-20 ℃.

3. according to claim 1 and method claimed in claim 2, it is characterized in that:

1. the light source of described light treatment is one group of light-emitting diode lamp tube (LED);

2. described light intensity is to control to the distance of influences of plant crown by adjusting quantity and the lamp of lamp;

3. the described photoperiod adopts a timing means to control.

4. method according to claim 1, is characterized in that: described romaine lettuce is heat resistanceheat resistant type romaine lettuce.