JP2014000057A - Plant cultivation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve practicability of a plant cultivation system that cultivates plants inside a building by using a culture solution.SOLUTION: There is provided a plant cultivation system in which plants are cultivated by circulating a culture solution contained in a culture solution pan 20, the system comprising: i) a first nanobubble supply device 96 for supplying, in a circulation path 82, nanobubbles of an oxygen-containing gas to the circulating culture solution; and ii) a second nanobubble supply device 104 for supplying, in a water feeding path 98, nanobubbles of an oxygen-containing gas to the feeding water. By the two kinds of nanobubble supply devices, the nanobubbles are added not only to the circulating culture solution but also the nanobubbles are added to the feeding water. Thus the culture solution in the culture solution pan can be kept in a good condition with considerable efficiency.

Description

  The present invention relates to a plant cultivation system for cultivating a plant in a building.

  In recent years, plant cultivation systems for cultivating plants in buildings have attracted attention, and various studies have been made. For example, in the system described in Patent Document 1 below, addition of microbubbles and nanobubbles to the culture solution has been studied. For example, in the system described in Patent Document 2 below, cultivation is in progress. The application of strong acidic electrolyzed water to these plants (hereinafter sometimes referred to as “seedlings”) has been studied.

JP 2008-206448 A JP 2006-42614 A

  The plant cultivation system is under development, and it is possible to enhance the practicality by making various improvements. This invention is made | formed in view of such a situation, and makes it a subject to provide a highly practical plant cultivation system.

  In order to solve the above problems, a plant cultivation system of the present invention is a plant cultivation system for cultivating a plant in a building, i) a cultivation table installed in the building and arranged with a plurality of seedlings, and ii ) A culture solution tank containing nutrients in water and arranged below the cultivation stand so that the roots of each of a plurality of seedlings are in contact with the culture solution; and iii) a culture solution tank A culture medium circulation apparatus having a circulation path provided outside the medium and circulating the culture medium using the circulation path, and iv) having a supply path connected to the circulation path, and culturing using the supply path A water replenishing device for replenishing water to the liquid, v) an anti-circulating liquid nanobubble supply device for supplying nanobubbles of oxygen-containing gas to the circulating culture solution, arranged in the circulation path, and vi) arranged in the replenishment path, Anti-replenishment water nano to supply oxygen-containing nanobubbles to the replenished water Characterized by comprising a table feeder.

  The plant cultivation system of the present invention is provided with two types of nanobubble supply devices, and with these two types of nanobubble supply devices, nanobubbles are added to the circulating culture solution and the water to be replenished Even nanobubbles will be added. Therefore, according to the plant cultivation system of the present invention, it is possible to keep the culture solution in the culture solution tank in a considerably good state considerably efficiently.

Aspects of the Invention

  In the following, some aspects of the invention that is recognized as being claimable in the present application (hereinafter referred to as “claimable invention”, which is a concept including the invention described in the claim) will be exemplified, explain. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is merely for the purpose of facilitating the understanding of the claimable inventions, and is not intended to limit the combinations of the constituent elements constituting those inventions to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which some constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention.

  In each of the following items, the combination of items (13) and (15) corresponds to claim 1, and the technical feature of item (16) is added to claim 1 in claim 2. The technical feature of (17) is added to claim 1 or claim 2, and the technical feature of (21) is added to any one of claims 1 to 3. What is added is Claim 4 and Claim 4 is added with the technical feature of (23), Claim 5 is added, and Claim 5 is added with the technical feature of (24). The technical feature of (22) is added to any one of claims 4 to 6 in claim 7, to claim 7, and to any one of claims 1 to 7 in (31). The technical feature of item (32) and item (32) is added to claim 8 and to any one of claims 1 to 7 (41). And the technical feature of (42) is added to claim 9, and the technical feature of (43) and (44) is added to any one of claims 1 to 9. It corresponds to claim 10, respectively.

[A] Basic Aspects The aspects of several items below are basic aspects of the plant cultivation system according to the claimable invention.

(1) A plant cultivation system for cultivating plants in a building,
A cultivation table installed in the building and on which a plurality of seedlings are arranged,
A plant culture comprising: a culture solution containing nutrients in water; and a culture solution tank disposed below the cultivation table so that the roots of each of the plurality of seedlings are in contact with the culture solution. system.

  The system of this aspect is a system for cultivating (also called “nurturing”) plants by so-called hydroponics. The plant to be cultivated is not particularly limited, and may be an edible plant or an ornamental plant. Hydroponic cultivation using a culture solution (which can also be called “nutritional solution”) can grow a large number of seedlings quickly and stably, and can be charged if the current food situation is taken into consideration The system according to the invention is preferably a system for cultivating edible plants. In that case, it may be a system for cultivating leaves (such as “leaf vegetables”) that eat leaves such as lettuce, and cultivating plants (including “fruit vegetables”) that eat fruits such as tomatoes. It may be a system that does. In addition, when not using rock wool, gravel, etc. in a culture tank, it is desirable to be a system which grows the plant which eats the said leaf.

  The building in which the system of this aspect is installed is not particularly limited, and may be a building that is sealed or substantially sealed from the outside, such as a clean room described later, and a part of the side wall or ceiling. Alternatively, a building that is not entirely provided, that is, a building that is open to the outside air may be used. Further, it may be a building where natural light (which is a concept including “direct sunlight”) is taken for cultivation, or a building where natural light is blocked.

  (2) A plant cultivation system having a circulation route provided outside the culture solution tank and provided with a culture solution circulation device for circulating the culture solution using the circulation route.

  In the system of this aspect, for example, a part of the culture solution is discharged from the culture solution tank to the outside, and a part of the discharged culture solution is returned to the culture vessel again. By performing filtration, sterilization, adjustment, etc., on the outside of the culture bath, that is, a part of the culture broth discharged and returned in the circulation path, the culture broth in the culture bath is always good. It is possible to keep it in a state. In the system of this embodiment, the circulation of a part of the culture solution may be performed continuously or intermittently.

(3) A plurality of cultivation tables arranged in a shelf shape, each of which is the cultivation table,
(1) or (2) provided with a plurality of culture vessels provided corresponding to the plurality of cultivation stands, each of which is arranged below the corresponding cultivation stand and functions as the culture vessel The plant cultivation system described in 1.

  The amount of the plant to be cultivated per area (floor area), that is, the yield per unit area can be increased by providing a plurality of cultivation stands. In view of that, the system of this aspect is a system that is good in space efficiency. In addition, when providing a cultivation stand in multiple steps, it is desirable that the height of the plant to be cultivated is low to some extent. Considering this, the system of this aspect is suitable for a system for cultivating the plant that eats the leaves described above.

  (4) The plant cultivation system according to any one of (1) to (3), wherein the building is a clean room.

  A clean room can be thought of as a room that is largely isolated from the outside air, in other words, from the outside environment. Therefore, in the clean room, an environment in which the invasion of germs from the outside is considerably suppressed is realized. The building has a clean room, and the plant is cultivated in the clean room by cultivating the plant, so that the infection of various bacteria in the plant is suppressed, the cleanliness of the cultivated plant, and the safety of eating Etc. can be improved.

  (5) The plant cultivation system according to any one of (1) to (4), wherein the building is configured to block external light.

  For example, when growing seedlings with sunlight, the speed of the growth depends on the weather. The system according to this aspect can be a system using artificial light, for example. If artificial light is used, a system with a high growth rate can be constructed.

[B] Embodiments Containing Nanobubble-Containing Culture Solution The embodiments described in the following several items are embodiments in which limitations relating to the use of a culture solution to which nanobubbles are added are added.

  (11) The plant cultivation system according to any one of (1) to (5), comprising one or more nanobubble supply devices for supplying nanobubbles of oxygen-containing gas to the culture solution.

  In the system of this aspect, oxygen-containing gas nanobubbles are added to the culture solution in the culture solution tank. “Oxygen-containing gas” means a gas containing gaseous oxygen, and examples thereof include oxygen gas and air. “Nanobubble” means extremely fine bubbles, and generally has a diameter of 1 μm or less. Even a culture solution to which nanobubbles are added appears to the transparent culture solution to the naked eye. Nanobubbles have characteristics such as a long residence time in a liquid, a self-pressurizing effect, an excellent gas dissolving effect, a decrease in compression due to physical stimulation, and a charging action. Therefore, according to the present system for cultivating plants using a culture solution to which nanobubbles of oxygen-containing gas are added, for example, supply of oxygen into water, elimination of anoxic water masses, reduction of pollutants and harmful substances in water , Improvement of the water quality of the culture medium, prevention of sedimentation of sediments, suppression of the occurrence of blue sea urchin, oxidation of inorganic nitrogen compounds such as ammonia, cleaning that does not require a purifier, reduction of stress on the environment, and sterilization of the culture medium Any one or more of the operational effects can be expected.

  The nano bubble supply method in the nano bubble supply device is not particularly limited, and any method such as a pressure dissolution method, a gas-liquid shear method, a cavitation method, an ultrasonic generation method, a venturi method, and a static mixer method can be adopted. is there. As will be described in detail later, in consideration of the high concentration, fineness, and uniformity of the added nanobubbles, a method combining two or more of the above methods, that is, a so-called hybrid method is adopted. It is desirable to do.

  (12) The plant cultivation system according to item (11), further including a culture solution circulation device that has a circulation path provided outside the culture solution tank and circulates the culture solution using the circulation route.

  This embodiment is an embodiment in which the addition of nanobubbles of oxygen-containing gas to the culture solution described above is applied to the above-described system for circulating the culture solution. A system capable of enjoying both of the advantages of the addition of oxygen gas nanobubbles will be constructed.

(13) At least one of the one or more nanobubble supply devices is
The plant cultivation system according to item (12), wherein the plant cultivation system is a counter-circulating fluid nanobubble supply device that is arranged in the circulation path and supplies nanobubbles of oxygen-containing gas to a circulating culture solution.

  In short, this mode is a mode in which nanobubbles are added to the culture solution in the circulation path outside the culture solution tank. For example, by continuously circulating a part of the culture solution while adding nanobubbles in the circulation route, the culture solution in the culture solution tank can be efficiently maintained in a good state.

  (14) The plant cultivation system according to (12) or (13), further comprising a water supply device that has a supply route connected to the circulation route and supplies the culture solution with water using the supply route.

  Water, which is the main component of the culture solution, is absorbed by the growing plant, that is, the seedling, and evaporates in the culture solution tank. Since this aspect can replenish the water, the amount of the culture solution in the culture solution tank can always be kept at an appropriate amount.

(15) At least one of the one or more nanobubble supply devices is
The plant cultivation system according to (14), wherein the plant cultivation system is disposed in the replenishment route and is a supply water nanobubble supply device for replenishment water that supplies oxygen-containing nanobubbles to the replenished water.

  In this embodiment, nanobubbles are added to the replenished water. It is also possible to add nanobubbles to the culture solution, more specifically to the culture solution in the culture solution tank, by supplying nanobubbles to the water to be replenished.

In addition, this aspect can also be set as the following aspects by combining with the aspect described above.
“It comprises two or more nanobubble supply devices as the one or more nanobubble supply devices,
At least one of the two or more nanobubble supply devices is disposed in the circulation path, and is a counter-circulation fluid nanobubble supply device that supplies nanobubbles of oxygen-containing gas to a circulating culture solution. A plant cultivation system in which one is disposed in the replenishment path and is a supply water nanobubble supply device for supplying oxygen-containing gas nanobubbles to the replenished water. ]
This mode is simply a mode provided with two types of nanobubble supply devices. According to this aspect, nanobubbles are added to the circulating culture solution, and nanobubbles are also added to the replenished water. Therefore, it is possible to keep the culture solution in the culture solution tank in a considerably good state considerably efficiently.

  In general, the amount of water to be replenished is small compared to the amount of circulating culture solution, and the amount of water decrease due to absorption, evaporation, etc. of plants varies depending on the cultivation conditions, etc. Replenishment is often performed irregularly or from time to time. In that case, for example, when the nano bubble supply device is disposed only in the circulation path, the amount of nano bubbles supplied by the nano bubble supply device is not changed between when water is supplied and when water is not supplied. Unless the amount of nanobubbles supplied at the time of replenishment is increased, the total amount of nanobubbles in the culture solution tank cannot be maintained within an appropriate range. On the other hand, according to the aspect provided with the above-mentioned two types of nanobubble supply devices, the nanobubble supply device arranged in the circulation path is operated by operating the nanobubble supply device arranged in the supply route only at the time of water supply. With the state kept constant, that is, without changing the amount of nanobubbles supplied by the nanobubble supply device, it is possible to keep the total amount of nanobubbles in the culture bath in an appropriate range.

(16) At least one of the one or more nanobubble supply devices is
An anti-circulating liquid nanobubble supply device that is disposed in the circulation path and supplies nanobubbles of oxygen-containing gas to a circulating culture medium,
The plant cultivation system according to (14) or (15), wherein the replenishment route is connected to the circulation route between the culture solution tank and the place where the circulating liquid nanobubble supply device is disposed.

  According to this aspect, the culture solution that has been sterilized, supplied with oxygen, or the like by the nanobubble supply device provided in the circulation path is replenished with new water, and the culture solution that is replenished with the new water is the culture solution. It will be returned to the tank.

  According to the aspect which combined the aspect provided with the said 2 types of nano bubble supply apparatus, and this aspect, the culture solution and water which were each sterilized, oxygen supply, etc. by the nano bubble supply apparatus were mixed, and culture solution Since it is sent to the tank, it is possible to efficiently maintain the culture solution in the culture solution tank in a good state.

  (17) The paragraph (14) to (16), further comprising a culture medium adjusting device that is disposed in the circulation path between the place where the replenishment path is connected and the culture medium tank, and adjusts the nutrient concentration of the culture medium The plant cultivation system as described in any one.

  In the circulation path, when the culture medium adjusting device is arranged upstream of the place where water is replenished, when replenishing water, the nutrient concentration must be adjusted in consideration of the amount of water to be replenished, Ease of adjustment of nutrient concentration is lost. Absent. On the other hand, according to this aspect, since the nutrient concentration adjustment is performed to the mixture of the circulating culture solution and the supplemented water, the nutrient concentration of the culture solution in the culture solution tank can be simply set. It becomes possible to keep in an appropriate range.

[C] Aspects related to spraying of strongly acidic electrolyzed water The embodiments of the following several items are aspects related to spraying of strongly acidic electrolyzed water.

(21) An electrolyzed water generating device that generates electrolysis of strongly acidic electrolyzed water using electrolysis;
A plant cultivation system according to any one of (1) to (17), comprising: a spraying device that sprays the strongly acidic electrolyzed water into the building.

  “Strongly acidic electrolyzed water” is also called super-oxidized water, strong-oxidized water, strongly-acidic water, oxidized ion water, aqua-oxidized water, etc., for example, electrolyzing water added with a trace amount of salt (NaCl, KCl, etc.) By doing so, it is water generated from the anode side. If the physical properties of the strongly acidic electrolyzed water are shown, for example, the pH is 2.7 or less, the oxidation-reduction potential is +1.1 V or more, the dissolved oxygen concentration is 15 ppm or more, and the dissolved chlorine concentration is 20 to 40 ppm. Strongly acidic electrolyzed water may contain hypochlorous acid (HClO) depending on the salt added, and by virtue of the function of hypochlorous acid, the strongly acidic electrolyzed water exerts effects such as sterilization, washing and disinfection of microorganisms. To do. In this aspect, the strong acidic electrolyzed water is sprayed onto the building where the plant is cultivated, thereby producing an effect of keeping the cultivated plant healthy. Note that strong acidic electrolyzed water reacts with light and organic matter to reduce the oxidation-reduction potential, and changes to weakly acidic water. Therefore, even if this aspect is applied to a system for cultivating plants for food, The safety of eating cultivated plants is high. In that sense, spraying of strongly acidic electrolyzed water is suitable for a system for growing edible plants.

  (22) The spraying device includes a nozzle that atomizes strong acidic electrolyzed water with compressed air, and is configured to spray strong acidic electrolyzed water from the nozzle into the building. Plant cultivation system.

  This mode is a mode in which a limitation relating to the spray system is added, and spraying is performed using a so-called two-fluid system nozzle. This two-fluid system is a system in which strong acidic electrolyzed water and compressed air are made to collide with each other, whereby the strongly acidic electrolyzed water is finely divided. According to this system, highly refined strongly acidic electrolyzed water is sprayed. Will be. By refining the strong acid electrolyzed water, the strong acid electrolyzed water spreads throughout the entire building, and the adverse effect on the seedling when the strong acid electrolyzed water touches the seedling can be reduced. .

(23) The electrolyzed water generating device generates strong alkaline electrolyzed water together with strongly acidic electrolyzed water,
The plant cultivation system according to item (21) or (22), comprising a floor cleaning device for cleaning the floor by flowing the generated strong alkaline electrolyzed water over the floor of the building.

  When generating strongly acidic electrolyzed water by electrolyzing water to which a small amount of salt is added, strongly alkaline electrolyzed water is generated on the cathode side. In this embodiment, the strongly alkaline electrolyzed water is used for cleaning the floor of a building. Strong alkaline electrolyzed water contains hydroxides (for example, NaOH, KOH, etc.), and the hydroxides have a high cleaning effect on, for example, protein-based and lipid-based soils. In view of this, cleaning with strong alkaline electrolyzed water is suitable for cleaning the floor of a building where the system is deployed.

  In this aspect, spraying of strongly acidic electrolyzed water is also performed, but most of the sprayed strong acid electrolyzed water eventually falls on the floor of the building and remains on the floor surface or drainage grooves on the floor. Etc. are drained out of the building using the drainage channel. By performing floor washing with strong alkaline electrolyzed water, the strongly acidic electrolyzed water remaining on the floor surface is washed away together. And when a drain ditch etc. are provided, strong alkaline electrolyzed water is also drained along the same path as strong acid electrolyzed water. Acidic or alkaline water is generally discharged after neutralization in consideration of the external environment. According to this aspect, the drainage path of the strongly acidic electrolyzed water and the strongly alkaline electrolyzed water is the same. Thus, the mutual neutralization action can be used, and the burden of the neutralization process can be reduced.

  (24) In the item (23), the floor cleaning device can selectively flow strongly alkaline electrolyzed water and strongly acidic electrolyzed water generated by the electrolyzed water generating device to the floor of the building. The plant cultivation system described.

  According to this aspect, since the floor of the building can be cleaned not only with strong alkaline electrolyzed water but also with strongly acidic electrolyzed water, the floor can be sterilized efficiently.

[D] Aspects related to release of carbon dioxide gas above seedlings Aspects of the following several items are aspects in which limitations relating to the supply of carbon dioxide (CO ₂ ) to plants to be cultivated are added.

  (31) (a) a supply path that extends along the cultivation stand above the plurality of seedlings and that is fed with carbon dioxide gas; and (b) is provided at intervals along the supply path. The plant according to any one of (1) to (24), further comprising a carbon dioxide gas releasing device that has a plurality of discharge ports and releases carbon dioxide gas toward the plurality of seedlings. Cultivation system.

  When a plant is cultivated in a building, it is also cultivated in an atmosphere having a higher carbon dioxide concentration than the atmosphere in order to accelerate the growth. On the other hand, when the interior of the building is shielded from the outside air such as a clean room, it is necessary to artificially supply carbon dioxide. This mode is a mode suitable for supplying carbon dioxide in such a case. In this embodiment, carbon dioxide can be supplied to the seedling from the upper side of the seedling so as to sink or settle. In addition, since carbon dioxide gas is heavier than air, it falls downward with its own weight. In view of this, it is desirable that the “release” in the present embodiment is not a discharge at a high speed such as ejection and injection but a discharge at a low speed such as outflow and leakage.

  When supplying carbon dioxide, it is also conceivable to release carbon dioxide gas from the upper part of the building to the entire building. However, when released in this way, human work in the building in connection with plant cultivation becomes difficult, so if possible, only in the vicinity of the plant, in other words, in the space above the cultivation table. It is ideal to only supply carbon dioxide. That is, it is desirable to supply carbon dioxide locally. According to this aspect, it is possible to supply carbon dioxide as locally as possible. Incidentally, in view of this, it is desirable that “above the plurality of seedlings” be substantially directly above the plurality of seedlings and release carbon dioxide gas from a position relatively close to the seedlings.

(32) The plant cultivation system is
A plurality of cultivation tables arranged in a shelf shape, each of which is the cultivation table,
Provided corresponding to the plurality of cultivation tables, each provided below the corresponding cultivation table and provided with a plurality of culture solution tanks functioning as the culture solution tank and the plurality of cultivation tables, A plant cultivation system according to item (31), further comprising: a plurality of carbon dioxide gas releasing devices which are the carbon dioxide gas releasing devices.

  This aspect is a suitable aspect when a plurality of cultivation stands are arranged in a shelf shape. When a plurality of cultivation stands are arranged in a shelf shape, when carbon dioxide gas is released from above the shelf, sufficient carbon dioxide is supplied to the seedlings on the uppermost cultivation stand, but the second step from the top Carbon dioxide does not reach the seedlings on the subsequent cultivation stand. In consideration of this, this aspect is provided with a carbon dioxide gas releasing device for each cultivation stand, so that carbon dioxide can be sufficiently supplied to the seedlings of any stage cultivation stand. Become.

[E] Aspects related to LED illumination Aspects of the following several aspects are aspects in which limitations relating to an apparatus for irradiating artificial light (LED light) to a plant in cultivation of the plant are added.

  (41) Arranged above the cultivation table, (A) a plurality of LED light sources, and (B) a holder that holds the plurality of LED light sources so that the plurality of LED light sources are arranged along the cultivation table. The plant cultivation system according to any one of items (1) to (32), comprising an LED lighting device having:

  In this embodiment, an LED is employed as a light source for artificial light. The LED has a small calorific value, and according to this aspect, the adverse effect of the heat of the light source on the cultivation environment can be made relatively small.

(42) The plant cultivation system is
(a) a supply path that extends along the cultivation stand above the plurality of seedlings, and is fed with carbon dioxide gas; and (b) a plurality of lines provided at intervals along the supply path. A carbon dioxide gas release device that has a discharge port and releases carbon dioxide gas toward the plurality of seedlings;
The plant cultivation system according to item (41), wherein the holding body is configured to hold the feeding path.

  In short, this aspect is an aspect in which the carbon dioxide gas releasing device described above is integrated with the LED lighting device. By integrating these devices, the system can be made compact. This makes it possible to simplify the operation for installing the cultivation stand in the building.

(43) The plant cultivation system is
A plurality of cultivation tables arranged in a shelf shape, each of which is the cultivation table,
A plurality of culture vessels provided corresponding to the plurality of cultivation tables, each of which is arranged below the corresponding cultivation table and functions as the culture solution tank,
The plant cultivation system according to (41) or (42), wherein the plant cultivation system includes a plurality of LED illumination devices provided corresponding to the plurality of cultivation tables, each functioning as the LED illumination device of the corresponding cultivation table. .

  When a plurality of cultivation stands are arranged in a shelf shape, the amount of light that the seedlings receive is sufficient, and in order to spread the light evenly to all plants, artificial lighting should be performed for each cultivation stand desirable. According to this aspect, it is possible to provide a sufficient amount of light evenly to a plurality of seedlings.

  Note that this embodiment can be combined with the previous embodiment. Specifically, the aspect is an aspect in which the carbon dioxide gas releasing device is integrated with the LED lighting device for each cultivation stand. According to such an aspect, it is possible to sufficiently enjoy the advantages of the above-described system downsizing and simplification of the cultivation table installation work.

  (44) The culture medium in which the holding body included in each of the plurality of LED lighting devices except for the one corresponding to the uppermost cultivation table is provided corresponding to the upper cultivation table. The plant cultivation system according to item (43), which is attached so as to be in contact with the lower surface of the tank.

  In this aspect, the LED lighting device is attached to the culture solution tank in the upper stage. An LED light source generates a certain amount of heat even if it is small. According to this aspect, since the heat generated by the LED light source is transmitted to the culture medium tank in the upper stage and the culture liquid stored in the culture liquid tank, effective heat dissipation is realized. It is possible to reduce the adverse effect on the cultivation environment caused by the heat generated by the light source. Moreover, according to this aspect, in addition to the integration of the LED lighting device and the carbon dioxide gas releasing device, the device and the culture solution tank are also integrated, and the system can be made compact. It becomes possible to fully enjoy the benefits of simplifying the cultivation table installation work.

It is a perspective view which shows the inside of the cultivation building where the cultivation shelf which comprises the plant cultivation system as an Example of claimable invention was arrange | positioned. It is a figure which shows the cultivation stand, culture solution tank, etc. which comprise the cultivation shelf of FIG. It is a block diagram which shows typically the whole structure of the plant cultivation system of an Example. It is a perspective sectional view of the stationary mixer which constitutes the nano bubble supply device used with the plant cultivation system of an example. It is a figure for demonstrating the principle of the electrolyzed water generating apparatus used with the plant cultivation system of an Example.

  Hereinafter, a plant cultivation system of an example will be described in detail with reference to the drawings as a form for carrying out the claimable invention. In addition to the following examples, the claimable invention is implemented in various forms including various modifications and improvements based on the knowledge of those skilled in the art, including the form described in the above [Aspect of the Invention] section. can do.

  The plant cultivation system according to the embodiment is a system for cultivating a plant in a building. Roughly speaking, facilities installed in a cultivation building, which is a space where plants are cultivated, a culture solution, and carbon dioxide gas , It can be divided into equipment for adjusting or generating electrolyzed water and supplying it to the cultivation building. The latter is deployed inside the system building attached to the cultivation building. Hereinafter, this system will be described separately for equipment in the cultivation building and equipment in the system building.

[A] Facilities in the cultivation building
i) Cultivation shelf (cultivation table and culture tank)
As shown in FIG. 1, the cultivation building 10 which is a building where plants are cultivated is a clean room, and the cultivation shelves 12 are arranged in a plurality of rows therein. Each of the plurality of cultivation shelves 12 includes four cultivation stands 14 having the same size as each other, arranged in four stages in a state of being supported in a shelf shape, more specifically, by several support columns 16. The top plate 18 is provided so as to be supported by the upper end of the support column 16. Incidentally, each of the plurality of cultivation shelves 12 has the same configuration.

  If one cultivation shelf 12 is described with reference to FIG. 2 (a) which is a front view of a part thereof and FIG. 2 (b) which is a side sectional view of a part thereof, the cultivation shelf 12 includes: Corresponding to the four cultivation stands 14, four culture solution pans 20 are provided. The cultivation table 14 has a large number of through holes 22 provided in a matrix, and a pot 24 is inserted into each of the large number of through holes 22. That is, many pots 24 are supported by each of the four cultivation stands 14. Incidentally, for easy understanding, the lower right end portion in FIGS. 2A and 2B shows a state where the pot 24 is removed.

  The pot 24 has a cylindrical shape with a diameter decreasing downward, and a carrier 26 such as rock wool is fitted therein. The plant to be cultivated, that is, the seedling 28 is supported by the carrier 26. That is, a large number of seedlings 28 are nurtured on one cultivation stand 14. Incidentally, the seedling 28 shown in the figure is a seedling of a plant that eats leaves, and its root 30 extends downward from the carrier 26. In addition, the seedlings 28 that have been grown and have reached the harvest time, that is, the harvested plants, are removed from the cultivation stand 14 together with the pots 24, and the removed seedlings are held in the pots 24 and start growing from now on. 28 is placed on the cultivation table 14 together with the pot 24.

  The culture broth 20 is a tank having a relatively low height with an opening at the top, that is, a thin tank, and functions as a culture liquid tank by containing the culture liquid 32 therein. . The culture broth 20 is disposed below the cultivation table 14 so that the cultivation table 14 is inserted into the upper part thereof. The culture medium pan 20 has a structure in which the culture medium 32 has a predetermined depth. More specifically, although not clearly shown in the figure, the side wall of the culture medium pan 20 is provided with an outflow hole for allowing the culture medium 32 to leak out (may be expressed as “overflow”). When the water surface of the culture solution 32 exceeds a predetermined height, the stored culture solution 32 is maintained at a predetermined depth by allowing a part of the culture solution 32 to flow out from the outflow hole. . When the culture solution 32 is at a predetermined depth, the root 30 of the seedling 28 is in contact with the culture solution 32. As will be described in detail later, the culture solution 32 that has flowed out of the outflow hole is collected and then returned to the culture solution pan 20 through a circulation path.

ii) LED lighting device and carbon dioxide gas releasing device Eight LED lighting devices 40 are attached to the cultivation shelf 12 corresponding to each of the four cultivation stands 14. Specifically, two LED illumination devices 40 are attached to one cultivation stand 14 so as to be aligned in the width direction (direction orthogonal to the longitudinal direction) of the cultivation shelf 12 above the cultivation table 14. Each of the eight LED lighting devices 40 includes a plurality of LED light sources 42 and a casing 44 that functions as a holding body that holds the plurality of LED light sources 42. The casing 44 is relatively long and elongated in the longitudinal direction over the entire length of the cultivation shelf 12, and holds a plurality of LED light sources 42 so as to be aligned in the longitudinal direction along the corresponding cultivation table 14. The LED lighting device 40 has a casing on the bottom surface of the culture medium pan 20 on the culture medium pan 20 provided corresponding to the cultivation table 14 on the uppermost stage, except for two things corresponding to the uppermost cultivation table 14. 44 is attached so as to contact. With such attachment, the heat generated by the plurality of LED light sources 42 is transmitted to the casing 44, the culture broth 20, and the culture broth 32, and is effectively dissipated. Incidentally, two things corresponding to the uppermost cultivation table 14 are attached to the top plate 18 so that the casing 44 is in contact with the lower surface thereof.

  A pair of tubes 46 are extended on both sides in the width direction of each LED lighting device 40 so as to sandwich the casing 44. That is, with respect to one cultivation stand 14, four tubes 46 are arranged above the seedlings 28 so as to extend in the longitudinal direction along the cultivation stand 14. Each tube 46 is fixedly held on the casing 44 by a hook 48 provided at a predetermined interval on the casing 44 of the LED lighting device 40. The tube 46 functions as a feed path through which carbon dioxide gas is fed, and the tube 46 has a discharge port 50 at a lower portion thereof for releasing the fed carbon dioxide gas toward the seedling 28. A plurality of small holes are provided at predetermined intervals in the longitudinal direction. The carbon dioxide gas is gradually released from the plurality of discharge ports 50 and settles toward the cultivation table 14 by its own weight. A transparent frame (fence) 52 that surrounds the plurality of seedlings 28 supported on the cultivation table 14 is provided around the cultivation table 14, and carbon dioxide gas is effectively disposed on the cultivation table 14. It is made to accumulate. Since the four tubes 46 and the discharge port 50 are provided so as to cover the entire surface of one cultivation table 14, and the frame 52 is provided around the cultivation table 14, the cultivation table Carbon dioxide is evenly and efficiently supplied to the plurality of seedlings 28 on 14, and carbon dioxide gas is prevented from flowing out to the side of the cultivation table 14.

  In the plant cultivation system of the present embodiment, since one cultivation shelf 12 is provided with four cultivation platforms 14, the amount of harvested plants, specifically, the yield per floor area of the cultivation building 10 is obtained. The amount is relatively large, and this system is a space efficient system. Moreover, since the two LED lighting devices 40 and the four tubes 46 are provided for each cultivation stand 14, any seedling 28 that is supported and nurtured by any cultivation stand 14 is sufficient. Artificial light is irradiated and carbon dioxide is sufficiently supplied.

  Regarding the supply of carbon dioxide, the tube 46 functions as a main component of the carbon dioxide gas releasing device, and the tube 46 is fixedly held in the casing 44 of the LED lighting device 40, so that the It can be considered that the carbon gas releasing device and the LED lighting device 40 are integrated. Furthermore, since the casing 44 of the LED lighting device 40 is attached to the culture liquid pan 20 at the upper stage, the carbon dioxide gas releasing device and the LED lighting device 40 and the culture liquid pan 20 are integrated. Can be considered. By such integration, in the system of the present embodiment, the cultivation shelf 12 can be easily assembled and installed.

iii) Strongly acidic electrolyzed water spray device and floor cleaning device As can be seen from FIG. 1, in the plant cultivation system of the present embodiment, in the upper part of the cultivation building 10, more specifically, in the portion near the ceiling of the inner wall surface of the cultivation building 10. (In the figure, the ceiling is removed) Two pipes are extended in parallel. One of the two pipes is an electrolyzed water upper pipe 60 through which strongly acidic electrolyzed water is supplied, and the other is a compressed air pipe 62 through which compressed air is supplied. A sprayer 66 having a spray nozzle 64 is installed in the two pipes 60 and 62. The spray nozzle 64 is a so-called two-fluid type nozzle, and the compressed air supplied by the compressed air pipe 62 is hit against the strongly acidic electrolyzed water supplied by the upper pipe 60 for electrolyzed water, The strongly acidic electrolyzed water is atomized and sprayed. That is, the spraying device 68 for spraying the strongly acidic electrolyzed water into the cultivation building 10 is configured including the electrolyzed water upper pipe 60, the compressed air pipe 62 and the sprayer 66. Since the strongly acidic electrolyzed water sprayed by the spray nozzle 64 is fine, it reaches the entire inside of the cultivation building 10, and the inside of the cultivation building 10 is sufficiently sterilized by the fine strong acidic electrolyzed water that reaches the inside. The

  On the other hand, the lower piping 70 for electrolyzed water to which strong acidic electrolyzed water and strong alkaline electrolyzed water are selectively fed to the lower part of the cultivation building 10, more specifically, the portion near the floor of the inner wall surface of the cultivation building 10. It is extended. In some places of the lower pipe 70 for electrolyzed water, an injector 74 having an injection nozzle 72 is installed. The injection nozzle 72 injects the strongly acidic electrolyzed water or strong alkaline electrolyzed water that has been selectively supplied toward the floor of the cultivation building 10 so as to flow to the floor. That is, the floor cleaning device 76 that includes the lower pipe 70 for electrolyzed water and the injector 74 and cleans the floor of the cultivation building 10 with electrolyzed water is configured. The strongly acidic electrolyzed water and strong alkaline electrolyzed water sprayed by the spray nozzle 72 reach the entire floor of the cultivation building 10 and the floor of the cultivation building 10 is sterilized and cleaned.

[B] Equipment in the System Building The equipment in the system building 80 will be described below with reference to FIG. In FIG. 3, in consideration of the complexity of the figure, a pump for supplying gas and liquid, a valve for switching between feeding permission and prohibition, a valve for switching the feeding path, etc. are described. Omitted.

i) Culture fluid related equipment As described above, the culture fluid flowing out from the culture fluid pan 20 provided in the cultivation shelf 12 returns to the culture fluid pan 20 through the circulation path 82 passing through the system building 80. Has been. In this circulation path 82, a collection tank 84, a filter 86, a UV sterilizer 88, a first nanobubble addition tank 90, a mixer 92, and a culture solution adjuster 94 are arranged in the order along the circulation direction of the culture solution. ing. That is, the culture solution circulation apparatus is configured to include the circulation path 82 and a pump for feeding the culture solution along the circulation path 82. Note that the recovery tank 84, the filter 86, the UV sterilizer 88, the first nanobubble addition tank 90, the mixer 92, and the culture solution adjuster 94 can also be considered as components of the culture solution circulating apparatus.

  The culture solution that has flowed out of the culture solution pan 20 is once stored in the collection tank 84 and then filtered through the filter 86. Filtration performed by the filter is mainly physical filtration, but biological filtration using bacteria may be performed. Thereafter, the UV sterilizer 88 performs sterilization by ultraviolet rays (UV) and sends the sterilization tank 90 to the first nanobubble addition tank 90. The first nanobubble supply tank 90 is provided with a first nanobubble supply device 96 as a circulating liquid nanobubble supply device that supplies nanobubbles of air to the circulating culture solution. Thus, in the first nanobubble addition tank 90, for the purpose of sterilization, oxygen supply, and the like, air nanobubbles are supplied, that is, added to the circulating culture medium. The supply of nanobubbles by the first nanobubble supply device 96 will be described later.

  In the mixer 92, water is supplied to the circulation path 82 at a certain timing in order to supply the culture pan 20 with water reduced by absorption, transpiration, etc. by plants. The system building 80 is provided with a replenishment path 98 connected to the mixer 92, and water to be replenished is fed through the replenishment path 98 to the mixer 92 where it is mixed with the culture solution. . In the replenishment path 98, the water softener 100 and the second nanobubble addition tank 102 are arranged in the order along the direction of supplying the water to be replenished. That is, the water supply device is configured to include a supply path 98 and a pump for supplying water along the supply path 98. In addition, the mixer 92, the water softener 100, and the 2nd nano bubble addition tank 102 can also be considered as a component of a water supply apparatus.

  Water such as tap water and well water supplied from the outside of the system building 80 is softened by the water softener 100 and sent to the second nanobubble addition tank 102. The second nanobubble supply tank 102 is provided with a second nanobubble supply device 104 as a supply water nanobubble supply device for supplying air nanobubbles to the replenished water. Thus, in the second nanobubble addition tank 102, for the purpose of sterilization, oxygen supply, etc., nanobubbles of air are supplied, that is, added to the water to be replenished. The supply of nanobubbles by the second nanobubble supply device 104 is the same as the supply of the first nanobubble supply device 96, and will be described later together with the supply of the first nanobubble supply device 96.

  The culture solution mixed with water in the mixer 92 is adjusted in nutrient concentration in the culture solution adjuster 94 for the purpose of replenishing nutrients reduced by the absorption of plants in the culture solution pan 20. The culture solution whose nutrient concentration has been adjusted is returned to the culture solution pan 20. In addition, since the cultivation ridge 10 is provided with a plurality of cultivation shelves 12 and each of the plurality of cultivation shelves 12 is provided with four culture solution pans 20, the circulation of the culture solution is For each culture medium pan 20, the culture medium pan 20 for circulation is changed in order.

  The first and second nanobubble supply devices 96 and 104 are devices as described in Japanese Patent Publication No. 2002-85949. In brief, each of the first and second nanobubble supply devices 96 and 104 includes a centrifugal pump and a stationary mixer 120 shown in FIG. The vortex pump pumps the culture solution or water from the first and second nanobubble addition tanks 90 and 120, respectively, sucks air from the outside using the negative pressure generated by its own activation, and the culture solution or water and air The gas-liquid mixture 122 is produced. The produced gas-liquid mixture 122 is sent to the static mixer 120 for further stirring and mixing. The stationary mixer 120 includes a cylindrical housing 124 and a shaft 126 that rotates inside the housing 124, and the upstream side in the axial direction is a screw part 128 and the downstream side is a cutter part 130. Yes. In the screw portion 128, the shaft 126 is provided with a spiral blade 132, and the gas-liquid mixture 122 is sent to the cutter portion 130 as a high-speed swirling flow by the rotation of the shaft 126. In the cutter unit 130, a plurality of protrusions 134 are provided on the inner peripheral surface of the housing 124, and the gas-liquid mixture 122 that has been swirled flows collides with the protrusions. Due to shear, cavitation, and the like resulting from this collision, the gas-liquid mixture 122 becomes an ultrafine mixture 136 by adding the first and second nanobubbles from the static mixer 120. Released into tanks 96 and 104. The ultrafine bubbles include a large amount of bubbles having a diameter of 1 μm or less, and those having a diameter of 1 μm or less become air nanobubbles. As described above, in the first and second nanobubble addition tanks 90 and 120, the first and second nanobubble supply devices 96 and 104 supply or add air nanobubbles to the culture solution or water. is there. Incidentally, in view of the mechanism of ultrafine bubbles in the static mixer 120, the nanobubble supply method in the first and second nanobubble supply devices 96 and 104 is a method that combines a gas-liquid shear method, a cavitation method, and the like. It can be considered as a so-called hybrid system.

  In the plant cultivation system of the present embodiment, nanobubbles are added to the culture solution continuously circulating in the outside of the culture solution pan 20, more specifically, the circulation path 82, and the culture solution of the culture solution pan 20 is efficiently obtained. Can be kept in a good state. Furthermore, in this system, since the nanobubbles are added to the replenished water not only in the culture medium circulation path 82 but also in the water replenishment path 98, the culture medium in the culture medium pan 20 is considerably equivalent Can be kept in good condition. In addition, replenishment of water is performed at any time, not continuously. Therefore, the second nanobubble supply device 104, which is the supply water nanobubble supply device, only needs to be operated in a certain operating state only when water is supplied. On the other hand, the 1st nano bubble supply apparatus 96 which is a circulating liquid nano bubble supply apparatus should just operate | move by a fixed operation state continuously. Therefore, in this system, both the first and second nanobubble supply devices 96 and 104 do not change the operating state, that is, the nanobubbles supplied by the first and second nanobubble supply devices 96 and 104 respectively. The total amount of nanobubbles in the culture broth 20 can be kept in an appropriate range without changing the amount. Moreover, in this system, the culture solution and water which were sterilized and supplied with oxygen by each of the first and second nanobubble supply devices 96 and 104 are mixed by a mixer 92, and the mixed solution is cultured. Returned to the liquid pan 20. This helps to keep the culture solution in the culture solution pan 20 in a good state efficiently. Furthermore, in this system, when the water is replenished, the nutrient solution is adjusted by the culture fluid adjusting device 94 for the mixture of the culture fluid and water. Concentration can be easily maintained in an appropriate range.

ii) Electrolyzed water-related equipment The strongly acidic electrolyzed water sprayed by the spraying device 68 and the strongly acidic electrolyzed water and strong alkaline electrolyzed water sprayed from the floor cleaning device are generated by the electrolyzed water generating device 140. The electrolyzed water generating device 140 simultaneously generates strong acidic electrolyzed water and strong alkaline electrolyzed water by electrolysis of water, and the water to be electrolyzed is the second water softener 100 and the second water in the replenishment path 98. It is supplied to the electrolyzed water generating device 140 through a route branched from the nanobubble addition tank 102.

The principle of electrolyzed water generation by the electrolyzed water generator 140 will be described with reference to FIG. The electrolyzed water generator 140 has a tank 142 to which water (H ₂ O) is supplied, and the inside of the tank 142 is divided into two chambers by an ion exchange membrane 144 that functions as a partition wall through which ions can permeate. It is divided. An anode 146 is disposed in one of the two chambers, and a cathode 148 is disposed in the other. The supplied water is supplied to each of the two chambers, and a small amount of sodium chloride (NaCl) is added to the water. By applying a predetermined voltage between the anode 146 and the cathode 148, strong acid water containing hypochlorous acid (HClO), that is, strongly acidic electrolyzed water 150, is present on the cathode side. , Strongly alkaline water containing sodium hydroxide (NaOH), that is, strongly alkaline electrolyzed water 152 is generated.

  The strongly acidic electrolyzed water and the strongly alkaline electrolyzed water generated as described above are sent to the strong acid water tank 154 and the strong alkaline water tank 156, respectively, and stored in these tanks 154 and 156. The supply pipe for the strongly acidic electrolyzed water communicates with the upper pipe 60 for electrolyzed water installed in the cultivation building 10, and the strongly acidic electrolyzed water is sent from the strong acid water tank 154 to the spraying device 68 to be sprayed. 66 is sprayed from the spray nozzle 64. The compressed air required for spraying the strongly acidic electrolyzed water is sent from the compressor (compressor) 158 installed in the system building 80 to the compressed air pipe 62 installed in the cultivation building 10.

  Further, the strongly acidic electrolyzed water is also sent from the strong acid water tank 154 to the switching device 160, while the strong alkaline electrolyzed water is sent from the strong alkaline water tank 156 to the switching device 160. The switcher 160 is connected to the lower piping 70 for electrolyzed water installed in the cultivation building 10 through the supply path, and the switching operation of the switcher 160 causes strong acid electrolyzed water and strong alkaline electrolyzed water to be switched. One is selectively sent to the floor cleaning device 76, and the selected one is jetted from the jet nozzle 72 toward the floor by the injector 74.

  A drain ditch 162 is provided on the floor of the cultivation building 10, and the sprayed strong acid electrolyzed water, the sprayed strong acid electrolyzed water, and the strongly alkaline electrolyzed water are collected by the drain ditch 162, and the system building. 80 is sent to the neutralization tank 164, neutralized in the neutralization tank 164, and then drained outside the system building 80. In this system, by making the drainage route of strong acidic electrolyzed water and strong alkaline electrolyzed water the same, their mutual neutralization action can be utilized, and the burden of neutralization treatment in the neutralization treatment tank 164 is reduced. .

iii) Carbon dioxide gas related equipment The carbon dioxide gas released from the tubes 46 arranged on the cultivation shelf 12 is sent from a cylinder 166 placed outside the system building 80 to the carbon dioxide gas adjusting device 168. The carbon dioxide gas adjusting device 168 is supplied to the cultivation building 10 and is distributed to each tube 46 disposed on each of the plurality of cultivation shelves 12. Incidentally, the carbon dioxide gas adjusting device 168 is configured to switch between permitting and prohibiting the release of carbon dioxide gas and adjusting the flow rate (flow velocity) of carbon dioxide gas released from each discharge port 50 of each tube 46. Has been.

DESCRIPTION OF SYMBOLS 10: Cultivation ridge [building] 12: Cultivation shelf 14: Cultivation stand 20: Culture liquid bread [culture liquid tank] 28: Seedling 30: Root 32: Culture liquid 40: LED lighting device 42: LED light source 44: Casing [holding body 46: Tube [feeding path, carbon dioxide gas releasing device] 50: Release port 64: Spray nozzle 68: Spraying device 76: Floor cleaning device 80: System building 82: Circulation route [culture medium circulating device] 90: First Nanobubble addition tank 92: Mixer 94: Culture solution adjusting device 96: First nanobubble supply device [to the circulating fluid nanobubble supply device] 98: Replenishment route [water supply device] 102: Second nanobubble addition tank 104: Second nanobubble supply Device [to supply water nanobubble supply device] 120: Static mixer 140: Electrolyzed water generator 150: Strong acidic electrolyzed water 152: Strong alkaline electrolyzed water

Claims (10)

A plant cultivation system for cultivating plants in a building,
A cultivation table installed in the building and on which a plurality of seedlings are arranged,
A culture solution containing nutrients in water is stored, and a culture solution tank disposed below the cultivation table so that the roots of each of the plurality of seedlings are in contact with the culture solution, and the culture solution tank A culture medium circulation apparatus having a circulation path provided outside and circulating the culture liquid using the circulation path;
A water supply device that has a supply path connected to the circulation path, and supplies the culture solution with water using the supply path;
An anti-circulating liquid nanobubble supply device that is arranged in the circulation path and supplies nanobubbles of oxygen-containing gas to the circulating culture solution;
A plant cultivation system comprising: an anti-supplementing water nanobubble supply device that is arranged in the replenishment path and supplies nanobubbles of oxygen-containing gas to the replenished water.   The plant cultivation system according to claim 1, wherein the replenishment route is connected to the circulation route between the culture solution tank and a place where the anti-circulating fluid nanobubble supply device is disposed.   The plant cultivation system of Claim 2 provided with the culture solution adjustment apparatus which is arrange | positioned at the said circulation path between the location where the said supply path | route connects, and the said culture solution tank, and adjusts the nutrient concentration of a culture solution. An electrolyzed water generator that produces electrolysis of strongly acidic electrolyzed water using electrolysis;
The plant cultivation system according to any one of claims 1 to 3, further comprising: a spraying device that sprays the strongly acidic electrolyzed water into the building. The electrolyzed water generating device generates strong alkaline electrolyzed water together with strongly acidic electrolyzed water,
The plant cultivation system of Claim 4 provided with the floor washing | cleaning apparatus which wash | cleans the floor by flowing the produced | generated strong alkaline electrolyzed water on the floor of the said building.   The plant cultivation according to claim 5, wherein the floor cleaning device is capable of selectively flowing strong alkaline electrolyzed water and strong acid electrolyzed water generated by the electrolyzed water generating device to the floor of the building. system.   7. The spray device according to claim 4, wherein the spraying device has a nozzle for finely granulating strong acid electrolyzed water with compressed air, and is configured to spray the strong acid electrolyzed water from the nozzle into the building. The plant cultivation system as described in any one. The plant cultivation system
A plurality of cultivation tables arranged in a shelf shape, each of which is the cultivation table,
A plurality of culture solution tanks provided corresponding to the plurality of cultivation tables, each arranged below the corresponding cultivation table and functioning as the culture solution tank,
Provided corresponding to the plurality of cultivation stands, each of which (a) extends along the cultivation table above the plurality of seedlings, and (b) a feeding path through which carbon dioxide gas is fed. A plurality of carbon dioxide gas releasing devices, each having a plurality of discharge ports provided at intervals along a supply path, for discharging carbon dioxide gas toward the plurality of seedlings. The plant cultivation system as described in any one of thru | or 7. The plant cultivation system
(A) a plurality of LED light sources, and (B) a holder that holds the plurality of LED light sources so that the plurality of LED light sources are arranged along the cultivation table. An LED lighting device;
(a) a supply path that extends along the cultivation table above the plurality of seedlings, and that is fed with carbon dioxide gas; and (b) a plurality of lines that are provided at intervals along the supply path. A carbon dioxide gas releasing device that has a discharge port and releases carbon dioxide gas toward the plurality of seedlings,
The plant cultivation system according to any one of claims 1 to 7, wherein the holding body is configured to hold the supply path. The plant cultivation system
A plurality of cultivation tables arranged in a shelf shape, each of which is the cultivation table,
A plurality of culture solution tanks provided corresponding to the plurality of cultivation tables, each arranged below the corresponding cultivation table and functioning as the culture solution tank,
Provided corresponding to the plurality of cultivation tables, each comprising a plurality of LED lighting devices functioning as the LED lighting device of the corresponding cultivation table,
The holding body included in each of the plurality of LED lighting devices except for the one corresponding to the uppermost cultivation table, the lower surface of the culture solution tank provided corresponding to the upper cultivation table. The plant cultivation system according to any one of claims 1 to 9, wherein the plant cultivation system is attached so as to be in contact with the plant.

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