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EP-3949722-B1 - LIGHT SOURCE FOR PLANT CULTIVATION AND PLANT CULTIVATION APPARATUS

EP3949722B1EP 3949722 B1EP3949722 B1EP 3949722B1EP-3949722-B1

Inventors

  • SONG, HYUN SU

Dates

Publication Date
20260506
Application Date
20200326

Claims (8)

  1. A plant cultivation light source (10) comprising: a main light source (11) and an auxiliary light source (12), wherein the main light source (11) emits light having at least two peak wavelengths, the at least two peak wavelengths falling within a wavelength region absorbed by chlorophyll, wherein the light emitted from the main light source (11) and the auxiliary light (12) increases the content of a phytochemical in the plant, wherein the phytochemical is ginsenoside, characterized in that the main light source (11) emits light having a first peak wavelength and a second wavelength peak, wherein the intensity of the first peak wavelength is substantially the same as the intensity of the second peak wavelength.
  2. The plant cultivation light source according to claim 1, wherein the main light source (11) emits red light and blue light.
  3. The plant cultivation light source according to claim 2 wherein intensity of the red light emitted from the main light source (11) is the same as intensity of the blue light emitted from the main light source (11).
  4. The plant cultivation light source according to claim 1, wherein the auxiliary light source (12) emits white light.
  5. The plant cultivation light source according to claim 1, wherein the main light source (11) and the auxiliary light source (12) emit light during a light period and do not emit light during a dark period, the light period being set to 16 hours per day and the dark period being set to 8 hours per day.
  6. The plant cultivation light source according to claim 1, wherein the plant cultivation light source (10) emits light having a wavelength of 400 nm to 700 nm.
  7. The plant cultivation light source according to claim 1, wherein the light emitted from the plant cultivation light source (10) has a light intensity of greater than 27 PPFD(µmol/m 2 /s) and less than 268 PPFD.
  8. A plant cultivation apparatus (100) comprising: a housing (110) having a nutrient medium space (115) for supplying a nutrient medium (170) to an emerged seedling of a plant, a cultivation member (120) disposed above the nutrient medium space (115) and comprising a cultivation plate (121) on which the seedling is cultivated; and a light source member (130) disposed above the cultivation plate (121) to illuminate the seedling, wherein the light source member (130) comprises a main light source (11) and an auxiliary light source (12), the main light source (11) emitting light having at least two peak wavelengths absorbed by chlorophyll, and the level of the nutrient medium (170) in the nutrient medium space (115) is set to allow roots of the seedling to be partially immersed in the nutrient medium (170), characterized in that the light source member (130) is a plant cultivation light source according to any one of claims 1-7.

Description

[Technical Field] The present disclosure relates to a plant cultivation light source and a plant cultivation apparatus. [Background Art] Plants produce organic matter from carbon dioxide and water using light energy through photosynthesis. Plants use chemical energy of organic matter obtained through photosynthesis as nutrients for growth. Plants contain phytochemicals that have beneficial effects on a subject in need thereof. Phytochemical levels of plants vary depending on growth environments. For example, plants produce antioxidants to protect themselves against damage from oxidative stress. When a human eats a plant that contains a large amount of phytochemicals, such phytochemicals bring in similar beneficial effects on a human body. Therefore, in order to obtain phytochemicals efficiently, it is desirable to harvest a plant when the content of phytochemicals in the plant reaches a maximum value thereof. One way to increase the phytochemical content of plants is to subject plants to illumination in order to apply stress to plants. Most experiments related to this subject have been conducted on full sun plants. Therefore, light stress conditions known in the art are not suitable for shade plants. Shade plants are plants that can live in the shade due to low light saturation and light compensation points thereof. Examples of shade plants may include ginseng, deodeok, leek, ginger, lemon balm, mint, and the like. Such known light stress conditions can cause photodamage to shade plants, which have low light saturation points. In addition, since shade plants have low saturation points, sunlight alone can cause the shade plants to be exposed to light intensity higher than necessary to perform photosynthesis. As a result, photosynthetic efficiency of shade plants is reduced due to photoinhibition, resulting in poor growth. Patent publication KR 101 904 676 B1 discloses a cultivation apparatus using a light-emitting device supplied with electrical energy generated through the use of solar cells. [Disclosure] [Technical Problem] Embodiments of the present disclosure provide a plant cultivation light source and a plant cultivation apparatus, which can increase the yield rate of a plant while increasing the phytochemical content of the plant. [Technical Solution] The present invention solves the problem with a plant cultivation light source according to claim 1. The present invention also provides a plant cultivation apparatus according to claim 8. [Advantageous Effects] According to the embodiments of the present disclosure, the plant cultivation light source and the plant cultivation apparatus can increase the content of a phytochemical in a plant without deterioration in quality. In addition, according to the embodiments of the present disclosure, the plant cultivation light source and the plant cultivation apparatus can prevent the roots of the plant from rotting through control over the level of the nutrient medium. Further, according to the embodiments of the present disclosure, the plant cultivation light source and the plant cultivation apparatus can increase the yield rate of the plant by minimizing loss due to quality degradation. [Description of Drawings] FIG. 1 is a block diagram of a plant cultivation light source according to one embodiment of the present disclosure.FIG. 2 is a graph showing the spectrum of light emitted from the plant cultivation light source according to the embodiment.FIG. 3 to FIG. 12 show results of an experiment to determine change in phytochemical content of sprout ginseng depending on light intensity.FIG. 13 shows results of an experiment to determine the growth of sprout ginseng depending on light intensity.FIG. 14 shows results of an experiment to determine the content of chlorophyll in sprout ginseng depending on light intensity.FIG. 15 is a schematic diagram of a plant cultivation apparatus according to one embodiment of the present disclosure.FIG. 16 to FIG. 18 show results of an experiment to determine the survival rate of sprout ginseng depending on the level of a nutrient medium. [Mode for Invention] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the embodiments are provided for complete disclosure and thorough understanding of the present disclosure by those skilled in the art. Therefore, the present disclosure is not limited to the following embodiments and may be embodied in different ways. In addition, the drawings may be exaggerated in width, length, and thickness of components for descriptive convenience and clarity only. Like components will be denoted by like reference numerals throughout the specification. In according with one embodiment of the present disclosure, a plant cultivation apparatus includes: a housing, a cultivation member, and a light source member. The housing has a nutrient medium space provided to supply a nutrient medium to an emerged seedling of