JP6676898B2 - Cultivation apparatus and cultivation method - Google Patents

Description

  The present invention relates to a cultivation apparatus and a cultivation method for cultivating a plant.

  BACKGROUND ART Conventionally, as a method of cultivating fruit vegetables and leaf vegetables, cultivation by a plant factory has been widely spread (for example, JP-A-2014-233231). In this plant factory, cultivation is currently performed by various methods. International Publication WO2005 / 000005 and Japanese Patent Application Laid-Open No. 2014-82979 disclose that artificial light is used to adjust the light and dark periods, and other nutrient solutions and carbon dioxide gas are adjusted to produce high-quality and uniform seedlings. A method of producing is disclosed.

  As in these conventional techniques, in cultivation in a plant factory, even in cultivation using artificial lighting, cultivation is performed by adjusting the light period, which is a period of irradiating light, and the dark period, which is a period of not irradiating light. . This is because a variety of physiological phenomena such as photosynthesis are cultivated at a clear circadian rhythm, so that high-quality plants can be stably cultivated.

  On the other hand, in order to shorten the cultivation period and cultivate efficiently, there is also a method of cultivating with a longer light irradiation time, that is, a longer light period. However, if the dark period of the plant to be cultivated is too short, the quality value of the plant may be reduced, for example, the leaves may turn yellow, or a growth disorder such as an abnormal appearance of the grass may occur.

  Further, in the closed space, the temperature and humidity in the closed space fluctuate with the switching between the light period and the dark period. The equipment for suppressing the fluctuation and controlling the environment in the enclosed space to be constant becomes complicated, and the equipment cost becomes high. In other words, in order to control each time zone to the optimal temperature and humidity during the light period and the dark period, an air conditioning design according to the air conditioning load in each time zone is necessary. Accordingly, the equipment becomes more complicated and the equipment cost becomes higher than when a certain control is performed.

JP 2014-233231 A International Publication WO2005 / 000005 JP 2014-82979 A

  An object of the present invention is to solve the above problems and to provide a cultivation apparatus and a cultivation method capable of stably producing high-quality plants stably at low cost.

  The cultivation device of the present invention is a cultivation device for cultivating plants in a closed space including a growing device, a lighting device, and an air conditioner, wherein a cultivation period of at least 72 hours from germination is a 24-hour light period condition, Is characterized by being cultivated at 500 to 15000 lx.

  In the present invention, the ratio Wb / Wa of the total cooling capacity (Wb) of all the air conditioners to the total power consumption (Wa) of all the lighting devices is preferably 1 or more and 5 or less. The environmental temperature in the closed space is preferably 10 to 30C.

  The cultivation method of the present invention cultivates a plant using the cultivation apparatus of the present invention.

  The cultivation method of the present invention is suitable for cultivating Cucurbitaceae plants.

  In the cultivation apparatus and the cultivation method of the present invention, the cultivation period of at least 72 hours after germination is set to the 24-hour light period, so that the plant to be cultivated can be efficiently grown. In addition, by making the illuminance in this light period as low as 500 to 15000 lx, it is possible to suppress the occurrence of plant growth disorders under continuous lighting for 24 hours.

  In the present invention, since the cultivation is performed in the light period for 24 hours at least for a period of 72 hours from germination, there is no switch between the dark period and the light period during this cultivation period, and the environmental change associated therewith can be further reduced. In addition, cultivation in a closed space makes it difficult to control the temperature and humidity particularly in the dark period, and costs are increased. However, in the present invention, the dark state is not required, and the temperature and humidity in the closed space are not required. Equipment costs for controlling the humidity and costs for controlling the humidity can be reduced.

It is a top view of the cultivation device concerning an embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. 1. It is a front view of a multi-stage shelf type plant growing device. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. It is a top view of the tray of the multi-stage shelf type plant growing device concerning an embodiment. It is a perspective view of the tray of FIG. FIG. 7 is a sectional view taken along line VII-VII in FIG. 5. It is sectional drawing of the tray of the multistage shelf-type plant growing apparatus which concerns on another embodiment.

  A preferred embodiment of the present invention will be described with reference to FIGS. FIGS. 1 to 7 show a cultivation apparatus according to a first preferred embodiment. As shown in FIGS. 1 and 2, in a room of a closed-type building structure 1 that is completely shaded and surrounded by heat-insulating walls. A plurality of box-shaped (four in the illustrated example) multistage shelf-type plant growing apparatuses 3, 4, 5, and 6 are installed. In this embodiment, the plant growing device is a seedling raising device.

  In FIG. 1, two multi-stage shelf-type plant growing devices 3 and 4 are arranged in one row so that their open front faces in the same direction, and two multi-stage shelf-type plant growing devices 5 and 6 are also arranged in one row. The open front faces are arranged so as to face in the same direction to form one row, and two rows are arranged in the room such that the open front faces each other. In addition, a work space is provided between these two rows so that one or more workers can work. A space having a width of about 50 to 500 mm is provided between the wall surface of the room and the back of each of the multi-stage shelf-type plant growing devices 3 to 6 to form an air passage that has passed through the multi-stage shelf type plant growing devices 3 to 6. I do.

  It is preferable to install an air curtain inside the door 2 for entering and exiting the room, because it is possible to prevent outside air from entering when the worker enters and exits.

Air conditioners 7 to 10 having a function of adjusting the temperature and humidity of the air in the room and circulating the air whose temperature and humidity have been adjusted according to the set conditions are installed above the wall surface of the room.

  As shown in FIGS. 3 and 4, each of the multi-shelf-type plant growing devices 3 to 6 has a pedestal 3c, left and right side panels 3a, a back panel 3b at the back, and a top panel 3e at the zenith, and the front is open. It has a box-shaped structure. Inside this box-shaped structure, a plurality of seedling shelves 12 are arranged in multiple stages at regular intervals in the vertical direction. The seedling raising shelf 12 at the bottom is mounted on the pedestal 3c. The seedling shelves 12 other than the bottom row are respectively set on the support plate 11 (FIG. 7). Each support plate 11 is horizontally installed between the left and right side panels 3a.

  The height of each of the multi-shelf type plant growing devices 3 to 6 is about 2000 mm, which is a height that can be worked by an operator, and the lateral width of the seedling raising shelf 12 is several tens to several hundreds of cells (small bowls). Can be placed side by side on a plurality of resin cell trays arranged in a lattice pattern, and the width of the space S above each seedling raising shelf 12 can be adjusted to be constant, for example, about 1000 mm to 2000 mm. Is preferably 500 mm to 1000 mm. A plurality of cell trays 40 (see FIGS. 1 and 7) are placed substantially horizontally on each nursery rack 12. The dimensions of a single cell tray are generally about 300 mm in lateral width and about 600 mm in depth.

  The level of each seedling rack 12 can be adjusted by an adjuster (not shown) provided on the base 3c. Each seedling rack 12 is provided with a watering device 30 described later.

  An artificial illuminator 13 is installed on the lower side of each of the seedling shelves 12 and the lower surface of the top panel 3e of the second or higher stage from the bottom, and plants growing on the cell tray 40 of the seedling shelves 12 immediately below each artificial illuminator 13 It is configured to emit light. In this embodiment, the uppermost artificial illuminator 13 is attached to the top panel 3e. The artificial illuminator 13 is provided with hooks on the left and right side panels 3a, 3a, and the artificial illuminator 13 is mounted on the left and right hooks. There is a gap between the support plate 11 and the artificial illuminator 13.

  As a luminous body of the artificial illuminator 13, a fluorescent lamp, an LED or the like is preferable, but in this embodiment, a straight tubular fluorescent lamp 13c is used as a light source. As shown in FIG. 7, in this embodiment, two straight tubular fluorescent lamps 13c are provided on the lower surface of the box 13a of each artificial illuminator 13, but the number of fluorescent lamps is not limited to this.

  The box 13a is a box-shaped body having a top plate 13d and a bottom plate 13e, and the bottom plate 13e also serves as a reflection plate for reflecting the light of the fluorescent lamp 13c. A power supply unit 13g incorporating an electric circuit member 13f such as a ballast, an inverter, a constant current circuit, a constant voltage circuit, and a current limiting resistor is mounted on the lower surface of the top plate 13d.

  As shown in FIG. 4, ventilation holes 15a are provided in the rear panel 3b behind the space (seedling space) S between the seedling racks 12 and between the seedling rack 12 at the top and the top panel 3e. An air fan 15 is attached to each of the ventilation holes 15a. By operating the air fan 15, a circulating air flow is generated in the room as indicated by the arrow in FIG. That is, the air conditioned and controlled by the air conditioners 7 to 10 is sucked into the seedling space S of each stage of the seedling raising shelf 12 from the open front side of the multi-stage shelf type plant growing devices 3 to 6, and is rearward from the vent 15a. It is discharged to the rear of the panel 3b, rises between the rear panel 3b and the wall surface of the closed building structure 1, is sucked into the air conditioners 7 to 10, is conditioned and conditioned, and is again a multi-stage shelf type. It is blown out to the open front side through the upper side of the plant growing devices 3 to 6.

  As shown in FIGS. 1 and 2, when two rows of multi-shelf-type plant growing devices 3 and 4 and multi-shelf-type plant growing devices 5 and 6 are arranged so that a work space is formed between them. The working space also functions as an air circulation path, and an effective circulation flow is formed.

  When the circulating flow passes through each seedling space S of the multi-stage shelf-type plant growing device 3 to 6, steam evaporated from the watering device, the culture medium, the plant and the like and the heat released from the artificial illuminator 13 are accompanied by the circulating flow. By circulating the circulating flow at a constant temperature and humidity by the air conditioners 7 to 10 and constantly circulating the same, the room can be maintained in an optimal temperature and humidity environment for plant growth. The flow velocity of the air flowing through the seedling raising space S is preferably 0.1 m / sec or more, more preferably 0.2 m / sec or more, and even more preferably 0.3 m / sec or more. If the speed of the airflow is too high, there is a possibility that a problem may occur in growing the plants. Therefore, generally, the speed is preferably 2.0 m / sec or less.

  In this embodiment, the airflow flows from the front of the seedling raising space S to the rear side of the multi-stage shelf type plant growing devices 3 to 6 via the fan 15, but conversely, the rear side of the multi-stage shelf type plant growing devices 3 to 6 From the front side. However, it is preferable to flow from the front side to the rear side because the airflow in the seedling raising space S becomes uniform.

  In this embodiment, the watering device (bottom watering device) 30 has a watering tray 31 placed on the support plate 11. The water is supplied from the bottom of the cell tray 40 placed on the watering tray 31. A configuration example of the watering device 30 will be described with reference to FIGS. 5 is a plan view of the watering device, FIG. 6 is a perspective view, and FIG. 7 is a sectional view taken along line VII-VII of FIG.

  The irrigation toilet 31 has a bottom plate 31d having a square planar shape. Side walls 31a, 31b, 31c are erected on the rear side and the left and right sides of the bottom plate 31d. A weir 34 is provided on the front side of the irrigation tray 31. A drain groove 32 is provided along the front side of the bottom plate 31d so as to be connected to the bottom plate 31d, and a drain port 32a (FIGS. 5 and 6) is formed at one end of the drain groove 32. The weir 34 is provided so as to partition the drain groove 32 and the upper surface side of the bottom plate 31d. Both ends of the weir 34 are separated from the side walls 31b and 31c, and a cutout 34a (FIGS. 5 and 6) is formed therebetween. The nutrient solution on the bottom plate 31d flows out of the notch 34a into the drain groove 32. A water supply pipe 33 for supplying nutrient solution into the irrigation tray 31 is provided along a side wall 31a on the rear side of the irrigation tray 31, and a plurality of small holes 33a provided in the water supply pipe 33 (FIG. 6). The nutrient solution is supplied onto the bottom plate 31d.

  A plurality of ribs 35 having a height of about 7 mm extend on the upper surface of the bottom plate 31d in parallel with each other from the side wall 31a toward the drain groove 32, and the cell tray 40 is placed on these ribs 35. It has become.

  As shown in FIG. 4, the watering device 30 has such a size that the drainage groove 32 projects from the open front surface of the multi-stage shelf type plant growing device 3 to 6 when the watering tray 31 is placed on the support plate 11. . By projecting the drainage groove 32 from the open front surface of the multi-stage shelf-type plant growing apparatus 3 to 6, the nutrient solution discharged from the drainage port 32 a of the drainage groove 32 is easily collected and discharged to the outside of the building structure 1.

  When the nutrient solution is continuously supplied from the small holes 33a provided in the water supply pipe 33 of the irrigation device 30, the nutrient solution is blocked by the weir 34 and accumulates up to a predetermined water level to be in a pool state. While the nutrient solution is being supplied from the water supply pipe 33, the nutrient solution flows out of the notch 34a into the drainage groove 32 little by little. It is preferable that the pool state of the water level of, for example, about 10 to 12 mm is maintained in the irrigation tray 31 by adjusting the supply amount of the nutrient solution and the outflow amount from the notch 34a. Water is sucked up from the cell holes 42 (FIG. 7) formed in the bottom surface of each cell 41 of the cell tray 40 placed on the rib 35 by a capillary action into the culture medium in the cell 41, and all the cells 41 are quickly absorbed. The medium inside becomes saturated with water.

  In this watering device 30, the upper surface of the bottom plate 31d of the watering tray 31 is inclined in the direction of the drain groove 32, as shown in FIG. This allows the nutrient solution to be drained to the drain 32 in a short time when irrigation is stopped. When the upper surface of the bottom plate 31d is inclined, the height of the rib 35 is changed so that the top 35a of the rib is horizontal, so that the cell tray 40 placed on the rib 35 can be horizontally moved. Can be held.

  FIG. 8 shows another example of the watering apparatus used in the present invention, and the same members as those in FIGS. 5 to 7 are denoted by the same reference numerals. In the watering device 30 ', the under tray 50 is interposed between the watering tray bottom plate 31d and the cell tray 40 when the cell tray 40 is placed on the watering tray bottom plate 31d. The under tray 50 has rigidity enough to support the cell tray 40 containing the culture medium in each cell 41, and has a plurality of small holes 51 formed on its bottom wall surface and a plurality of small holes 51 on its back surface. Are formed. These projections 52 function as gap holding means for holding a gap between the watering tray bottom plate 31d and the bottom surface of the cell tray 40 when the cell tray 40 is housed in the watering tray together with the under tray 50.

  In the irrigation device 30 ′ of FIG. 8 as well, when the nutrient solution is supplied from the water supply pipe 33 to be in a pool state at a predetermined water level, the nutrient solution is guided into the under tray 50 from the small holes 51 of the under tray 50. Water is sucked up by capillary action from a cell hole 42 formed in the bottom surface of each cell 41 of the cell tray 40 to a culture medium in the cell.

  In FIG. 8 also, hooks are provided on the left and right side panels 3a, 3a, and the artificial illuminator 13 is installed by placing the artificial illuminator 13 on the left and right hooks. There is a gap between

  As described above, the cell tray 40 placed on the irrigation tray 31 is formed by arranging tens to hundreds of cells 41 in a lattice shape and integrating them in a tray shape. Although it is 300 mm and the length is about 600 mm, it is not limited to this.

  In order to artificially supply the carbon dioxide gas consumed by the seedlings in photosynthesis, as shown in FIG. 1, a liquefied carbon dioxide gas cylinder 16 is installed outside the closed-type building structure 1, and a carbon dioxide gas concentration measuring device (not shown) The carbon dioxide gas is supplied from the carbon dioxide gas cylinder 16 so that the carbon dioxide gas concentration in the room measured by the above becomes constant.

  The above cultivation apparatus is an example of the present invention, and the present invention is not limited to this. For example, the size of the room and the number of the multi-shelf-type plant growing device may be other than those described above. Further, the air conditioner may be installed on a ceiling.

  In the present invention, the plant is cultivated in the cultivation apparatus configured as described above under a condition of a cultivation period of at least 72 hours from germination and a light period of 24 hours. The light period cultivation period is preferably 72 hours or more, particularly 96 hours or more, and is preferably 216 hours or less, particularly 168 hours or less, and particularly preferably 144 hours or less.

  The period from sowing to germination varies depending on the cultivar of the plant to be cultivated and the environment such as growth temperature, but most plants germinate in about 48 to 72 hours. In the present invention, it is important that the light period is at least 24 hours after germination, and the period from sowing to germination does not particularly limit the conditions of the light period and the dark period.

  It is important that the illuminance of the lighting device (the fluorescent lamp 13c in this embodiment) is 500 lx or more, preferably 1500 lx or more, more preferably 3000 lx or more, and even more preferably 4000 lx or more. preferable. It is important that the illuminance of the lighting device is 15000 lx or less, preferably 14000 lx or less, more preferably 12000 lx or less, and still more preferably 9500 lx or less. In the present invention, the illuminance is an average value measured on the cultivation surface of the plant being cultivated, at the center of the shelves to be cultivated, in the vicinity of the end, and at five points between the center and the end. Say. By setting the illuminance of the lighting device to the above, even when cultivated in the light period of 24 hours, it is possible to suppress the occurrence of growth disorders such as yellowing of leaves, and to make the growing conditions of the plant to be cultivated more preferable. can do. As described above, the illumination device is not limited to the fluorescent lamp, and an illumination device such as an LED can also be used.

  In the present invention, the concentration of carbon dioxide in the enclosed space is preferably 300 to 3000 ppm, more preferably 500 to 2000 ppm, further preferably 700 to 2000 ppm, and particularly preferably 800 to 1500 ppm. . By setting the carbon dioxide concentration within the above range, it is possible to suppress a decrease in the ability to fix carbon dioxide due to photosynthesis, and to generate energy required for growth without reducing the synthesis of energy sources (saccharides). .

  The environmental temperature of the closed space is preferably from 10 to 30C, more preferably from 15 to 30C, and even more preferably from 18 to 30C.

  A cultivation period of at least 72 hours from germination is a 24-hour light period, and cultivation under the above conditions allows the plant to be efficiently cultivated. In addition, it is possible to suppress the occurrence of problems such as growth disorders such as yellowing of leaves and abnormal morphology of grass.

In the present invention, the ratio Wb / Wa between the total cooling capacity (Wb) of all the air conditioners 15 and the total power consumption (Wa) of all the lighting devices (the fluorescent lamp 13c in the above embodiment) is 1 or more. It is preferably 1 or less, more preferably 1 or more and 4 or less, further preferably 1 or more and 3 or less, and particularly preferably 1 or more and 2 or less. By setting Wb / Wa within the above range, the environment in the closed space can be kept appropriate and constant, and furthermore, the environmental change due to turning on and off the air conditioner can be further reduced. If the power consumption per lighting device such as a fluorescent lamp is Ws, the number of lighting devices is n, the cooling capacity of one air conditioner is Wk, and the number of installed air conditioners is m, Wb / Wa Is represented by A in the following formula.
A = Wb / Wa
= (Wk × m) / (Ws × n)
m: Number of air conditioners (units)
n: Number of lighting devices (number)

  In the above embodiment, the watering device is provided, but may be omitted. In the present invention, during the cultivation period of at least 72 hours from germination, cultivation may be performed without supplying a nutrient solution or fresh water, or a nutrient solution or fresh water may be supplied at a fixed rate. Depending on the type and timing of the plant to be cultivated, the supply of nutrient solution and fresh water can be appropriately set according to the cultivation conditions for transferring the young seedling cultivated in the present invention to the field and cultivating it.

  The plant cultivated by the cultivation apparatus of the present invention is not particularly limited, but the present invention is more preferably suitable for cultivating a Cucurbitaceae plant. Further, it can be preferably used as a method for cultivating grafted seedlings and scion rootstocks.

  In the present invention, the term “light period” means that the cultivation is performed by lighting the lighting device substantially for 24 hours (/ day). However, the lighting device does not need to be continuously lit for 24 hours. The device may be turned off temporarily. In other words, temporarily turning off the illumination within a range in which the effects of the present invention can be achieved is included in the 24-hour light period.

  In a plant factory, it is very important to reduce equipment costs and maintenance costs, and the present invention does not adversely affect the cultivation of plants, and it is possible to reduce costs while being a completely closed cultivation equipment. It is possible to do.

Hereinafter, Examples and Comparative Examples will be described. In the following Examples and Comparative Examples, crops were cultivated by using cultivation apparatuses having the structures shown in FIGS. 1 to 7, and the growth states of the crops were evaluated according to the following criteria. The results are shown in Table 1.
○: good ×: abnormal growth (yellowing of leaves, abnormal leaf development, abnormal morphology, etc.)

<Example 1>
In a completely closed space in the closed-type building structure 1, two multi-shelf-type plant growing apparatuses 3 each having five stages and three shelves were installed. A total of 60 fluorescent lamps, each having an output of 45 W, were installed two on each shelf. One air conditioner having a cooling capacity of 5.0 kW was installed. The A value (the value of Wb / Wa) is 1.8.

  A cell tray 40 (200 holes) was placed on each seedling rack 12 and cucumber was sown. For 72 hours after seeding, the seeds were germinated in the dark and wet condition at 29 ° C. Irrigation was performed once a day for 120 hours after germination, and cucumber was cultivated under the conditions of illuminance of 8500 lx, light period of 24 hours, carbon dioxide concentration of 1000 ppm, ambient temperature of 28 ° C and humidity of 60 to 80%.

<Example 2>
Pumpkins were grown under the same conditions as in Example 1.

<Example 3>
Cucumbers were grown under the same conditions as in Example 1 except that the illuminance was set to 4500 lx and the A value was set to 2.6 by installing one fluorescent lamp (45 W) on each shelf.

<Example 4>
Pumpkins were cultivated under the same conditions as in Example 1 except that the illuminance was set to 4500 lx and the A value was set to 2.6 by installing one fluorescent lamp (45 W) on each shelf.

<Comparative Example 1>
Cucumbers were cultivated under the same conditions as in Example 1 except that the illuminance was set to 17000 lx by installing four fluorescent lamps (45 W) on each shelf.

<Comparative Example 2>
Pumpkins were cultivated under the same conditions as in Example 1 except that the illuminance was set to 17000 lx by installing four fluorescent lamps (45 W) on each shelf.

<Comparative Example 3>
Cucumbers were cultivated under the same conditions as in Example 1 except that the illuminance was 26000 lx and the A value was 1.7 by installing six fluorescent lamps (45 W) on each shelf.

<Comparative Example 4>
Pumpkins were cultivated under the same conditions as in Example 2 except that illuminance was set to 26000 lx and A value was set to 1.7 by installing six fluorescent lamps (45 W) on each shelf.

<Comparative Example 5>
Tomatoes were cultivated under the same conditions as in Example 1 except that the illuminance was 26000 lx and the A value was 1.7 by installing six fluorescent lamps (45 W) on each shelf.

<Comparative Example 6>
By arranging six fluorescent lamps (45 W) on each shelf, the illuminance was set to 26000 lx, the A value was set to 1.7, and the seeds were germinated for 72 hours after seeding at 29 ° C. in the dark and wet. Chingensai was cultivated under the same conditions as in Example 1 except that it was cultivated in the light period of 168 hours and 24 hours after germination.

  As shown in Table 1, according to Examples 1 to 4, a sufficiently grown crop (cucumber, pumpkin) can be cultivated. In Comparative Examples 1 and 3, an unusual leaf expansion in which cotyledons were curled occurred. In Comparative Examples 2, 4, and 6, yellowing of the leaves occurred. In Comparative Example 5, a morphological abnormality occurred in which the hypocotyl was bent and did not extend straight.

DESCRIPTION OF SYMBOLS 1 Closed building structure 3,4,5,6 Multi-stage shelf type plant growing apparatus 3a Side panel 3b Back panel 3c Pedestal 3e Top panel 7-10 Air conditioner 11 Support plate 12 Nursery shelf 13 Artificial illuminator 13a Box 13b Socket 13c Fluorescent lamp 13d Top plate 13e Bottom plate 13f Electric circuit member 13g Power supply unit 15 Air fan 16 Carbon dioxide gas cylinder 30, 30 'Irrigation device 31 Irrigation tray 31d Bottom plate 32 Drainage groove 32a Drain port 33 Water supply pipe 33a Small hole 34 Weir 34a Notch 35 Rib 40 cell tray 41 cell 42 cell hole 50 under tray 51 small hole 52 projection

Claims (4)

In a cultivation method of growing cucumber or pumpkin in a closed space equipped with a growing device, a lighting device and an air conditioner,
A cultivation period of at least 72 hours (but not more than 216 hours) from germination,
24 hours light period,
The illuminance of the lighting device is 1500 to 9500 lx,
A plant cultivation method, wherein a ratio Wb / Wa of a total cooling capacity (Wb) of all the air conditioners to a total power consumption (Wa) of all the lighting devices is 1 or more and 5 or less.   The method for cultivating a plant according to claim 1, wherein the environmental temperature in the closed space is 10 to 30C. The illuminance of the lighting device during the cultivation period is 4000 to 9500lx,
The ambient temperature in the enclosed space is 18-30 ° C.,
The method for cultivating a plant according to claim 1, wherein the Wb / Wa is 1 to 2. The growing device is a multi-shelf-type plant growing device having a seedling space S above each seedling rack,
The method for cultivating a plant according to any one of claims 1 to 3, wherein a flow velocity of the air flowing through the seedling raising space S is 0.1 m / sec or more.

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