WO2022202561A1 - Plant cultivation system - Google Patents

Abstract

Provided is a new plant cultivation system that makes it possible to ascertain the actual growth status of plants, and that helps to adjust the harvest time of plants to be produced and to increase profits. On the basis of data acquired by detecting the air environment in a closed space (13) forming a cultivation room (10) for actually cultivating plants (15), a control unit (50) calculates evaluation values of, inter alia, the photosynthesis rate of the plants (15), reflects the evaluation results in the air environment in the cultivation room (10), and controls the growth rate of the plants (15). An air pipeline (21) for circulating air in the cultivation room (10) is connected to the outside of the cultivation room (10), and an air-conditioning unit (23) and a supply pipeline (26) for air supply are connected on the air pipeline (21). The air environment is measured at positions near a pipeline outlet (21a) and a pipeline inlet (21b), and parameters such as changes in carbon dioxide concentration due to the difference in position can be detected. Alternatively, parameters such as changes in carbon dioxide concentration are detected from changes over time.

Description

plant cultivation system

The present invention relates to a plant cultivation system.

Generally, in a cultivation apparatus such as a plant factory, light, temperature, humidity, and carbon dioxide (CO ₂ ) concentration are controlled in a completely closed cultivation room or a semi-closed cultivation room like a facility in a building. Plants such as vegetables are produced by artificially controlling the internal environment. In addition, such cultivation apparatuses are roughly classified into a complete artificial light type that uses artificial light from a light source such as an LED without using sunlight, and a solar type that uses sunlight. Closed-type cultivation rooms have higher insulation than semi-closed-type ones, but in either case, it is necessary to maintain a constant indoor environment, such as temperature and humidity, so the environment is controlled using air conditioners and dehumidifiers is done.

For example, the plant cultivation apparatus of Patent Document 1 discloses a technology that can appropriately homogenize and maintain air quality conditions suitable for plant cultivation, contributing to stable quality of plants and an increase in yield. . Specifically, this plant cultivation apparatus includes a housing, an air recovery pipe, an air conditioner, and an air supply pipe. A housing|casing has the space which cultivates a plant inside. The air recovery pipe is connected to the recovery hole of the housing for recovering the air inside the housing. The air conditioner adjusts the temperature, humidity, and CO ₂ concentration of the air recovered from the recovery holes through the air recovery pipes to conditions suitable for plant cultivation. The air supply pipe connects the air conditioner and the supply hole of the housing, and supplies the air adjusted by the air conditioner into the housing through the supply hole of the housing. Further, as described in paragraphs 0026 and 0027 of Patent Document 1, the sensor is for measuring the air quality state of the air sucked into the air conditioner, and is arranged only on the upstream side of the air flow path. It is

Japanese Patent Application Laid-Open No. 2017-205072

For example, by using a technique such as Patent Document 1, it becomes possible to appropriately homogenize the air quality conditions in the plant cultivation environment. However, since the actual growth conditions of plants are not constant, it is not possible, for example, to harvest the plants at the appropriate harvest time.

Therefore, new technology is required to grasp the actual growth status of plants.

The present invention has been made in view of the above circumstances, and its object is to make it possible to grasp the actual growth situation of plants, to adjust the harvest period of plants to be produced and to increase profits. It is to provide a plant cultivation system that is

In order to achieve the above object, a plant cultivation system according to the present invention is characterized by the following (1) to (14).
(1) A plant cultivation system having a cultivation chamber inside which forms a closed space isolated from the outside air, and a cultivation container that is arranged in the closed space and can be used for cultivating plants,
A plant cultivation system comprising: a cultivation environment control unit that forms a cultivation environment necessary for cultivating the plant in the closed space and performs measurements for evaluating photosynthesis of the plant in the cultivation environment.

(2) an air conduit for air circulation, one end of which is connected to the air outlet of the cultivation chamber and the other end of which is connected to the air inlet of the cultivation chamber;
an air environment adjustment unit connected to the air duct and adjusting an air environment necessary for the growth of the plant in the closed space;
The cultivation environment control unit has a photosynthesis evaluation unit that evaluates photosynthesis in the plant in the closed space based on the air environment state detected in at least two locations in the air duct,
The plant cultivation system according to (1) above.

(3) The cultivation environment control unit controls at least the air environment adjustment unit so that the evaluation result of the photosynthesis evaluation unit is reflected in the adjustment of the cultivation environment for the plant in the closed space.
The plant cultivation system according to (2) above.

(4) The air environment adjustment unit has a carbon dioxide supply source capable of supplying carbon dioxide to the air pipeline and an oxygen supply source capable of supplying oxygen to the air pipeline.
The plant cultivation system according to (2) or (3) above.

(5) the photosynthesis evaluation unit detects at least one of carbon dioxide concentration, oxygen concentration, and humidity as the air environmental state;
The plant cultivation system according to any one of (2) to (4) above.

(6) The photosynthesis evaluation unit detects the carbon dioxide concentration at a position near the air inlet of the cultivation room as a first carbon dioxide concentration, and detects the carbon dioxide concentration at a position near the air outlet of the cultivation room. Having a carbon dioxide detection unit that detects as a second carbon dioxide concentration,
The plant cultivation system according to any one of (2) to (5) above.

(7) The photosynthesis evaluation unit detects the oxygen concentration at a position near the air inlet of the cultivation room as a first oxygen concentration, and detects the oxygen concentration at a position near the air outlet of the cultivation room as a second oxygen concentration. Having an oxygen detection unit that detects as the oxygen concentration of
The plant cultivation system according to any one of (2) to (6) above.

(8) The air environment adjustment unit has an air conditioning mechanism that adjusts the temperature and humidity of the air passing through the air pipeline.
The plant cultivation system according to any one of (2) to (7) above.

(9) The photosynthesis evaluation unit detects a carbon dioxide concentration at a first position near the air inlet of the cultivation room as a first carbon dioxide concentration, and detects carbon dioxide at a second position near the air outlet of the cultivation room. Having a carbon dioxide detection unit that detects the carbon concentration as a second carbon dioxide concentration,
The air environment adjustment unit includes a carbon dioxide supply source capable of supplying carbon dioxide to a third location between the first location and the second location on the air conduit, and capable of supplying oxygen to the third location. an oxygen supply source, and a supply-side carbon dioxide detection unit capable of detecting at least carbon dioxide concentration in the vicinity of the third position,
The plant cultivation system according to any one of (2) to (8) above.

(10) The photosynthesis evaluation unit determines the plant in the closed space based on the amount of carbon dioxide reduction per hour calculated from the measured values of at least the first carbon dioxide concentration and the second carbon dioxide concentration to assess photosynthesis in
The plant cultivation system according to (6) above.

(11) a lighting unit that irradiates the closed space with light necessary for growing the plant;
a nutrient solution tank connected to the cultivation container via a predetermined liquid passage,
The plant cultivation system according to any one of (1) to (10) above.

(12) The lighting unit includes a light source body arranged outside the closed space, and a light guide mechanism for guiding the light emitted from the light source body to the inside of the closed space and irradiating the plant in the closed space. having
The plant cultivation system according to (11) above.

(13) having a plurality of cultivation chambers each forming an independent closed space;
The cultivation environment control unit measures and evaluates the plant cultivation environments in the plurality of cultivation rooms individually and reflects them in the control.
The plant cultivation system according to any one of (1) to (12) above.

(14) The cultivation environment control unit controls the plant cultivation environment in the cultivation chamber so as to uniform the growth of the plant based on the results of evaluating the photosynthesis of the plant.
The plant cultivation system according to any one of (1) to (13) above.

According to the plant cultivation system having the above configuration (1), a cultivation environment suitable for plant growth is formed in a closed space by the control of the cultivation environment control unit, and the actual growth situation of the plant is correctly evaluated by photosynthesis. Then, the evaluation results can be reflected in cultivation. In addition, since the cultivation room is in a closed space, the cultivation environment can be easily adjusted, and the cultivation environment required for evaluating photosynthesis can be measured with high accuracy.
In the present disclosure, the closed space includes a semi-enclosed space and a completely closed space, and the semi-enclosed space means a space isolated from the outside air except for a part necessary for environmental control, A completely closed space means a closed space completely cut off from the outside air.

According to the plant cultivation system having the configuration (2) above, the air environment in the closed space is adjusted by the air environment adjustment section using the air conduit connected to the air outlet and air inlet of the cultivation room. Therefore, the air passing through the air duct is subject to adjustment by the air environment adjusting section, that is, since the space to be adjusted is smaller than the entire closed space, the air environment is adjusted to be suitable for plant growth. is easy. In addition, since the photosynthesis evaluation unit evaluates the photosynthesis of plants based on the air environment conditions detected at two points on the air pipeline, highly accurate evaluation is possible. That is, when measuring the air environment state at two points on the air pipeline, the air environment on the introduction side before plants consume carbon dioxide etc. by photosynthesis and the air environment after plants consume carbon dioxide etc. by photosynthesis It becomes easy to detect the air environment on the exhaust side with little error. In addition, since the cross-sectional area of the air pipeline is smaller than that of the cultivation room, the concentration of carbon dioxide in the air becomes uniform, and measurement errors are reduced.

According to the plant cultivation system configured in (3) above, it is possible to make adjustments so that the growing conditions of plants are uniformed by feedback control that reflects the evaluation results of the photosynthesis evaluation unit in the adjustment of the cultivation environment. That is, when the actual growth rate of the plant is slow compared to the target reference state, it is possible to adjust the cultivation environment in the direction of promoting the growth, and the actual growth rate of the plant is too fast compared to the reference state. In this case, it is possible to adjust the cultivation environment so as to suppress the growth.

According to the plant cultivation system having the configuration of (4) above, the carbon dioxide and oxygen in the air in the cultivation environment consumed by the plants during photosynthesis can be replenished, so the carbon dioxide concentration in the cultivation environment in the closed space, Oxygen concentration can be maintained in an appropriate state.

According to the plant cultivation system configured in (5) above, by detecting at least one of the carbon dioxide concentration, oxygen concentration, and humidity as the air environment state, it is possible to evaluate the photosynthesis of the plants in the closed space.

According to the plant cultivation system having the configuration (6) above, the first carbon dioxide concentration is detected in the air introduced into the cultivation chamber from the air inlet, and the second carbon dioxide concentration is detected in the air exhausted from the air outlet of the cultivation chamber. Detect carbon concentration. Therefore, based on the difference between the first carbon dioxide concentration and the second carbon dioxide concentration, it is possible to accurately grasp the amount of carbon dioxide consumed by the photosynthesis of the plant, and uniform the growth situation of the plant. can help to do so.

According to the plant cultivation system having the configuration (7) above, the first oxygen concentration is detected in the air introduced into the cultivation chamber from the air inlet, and the second oxygen concentration is detected in the air exhausted from the air outlet of the cultivation chamber. to detect Therefore, based on the difference between the first oxygen concentration and the second oxygen concentration, it is possible to accurately grasp the amount of oxygen consumed by the photosynthesis of the plant. can help.

According to the plant cultivation system having the configuration (8) above, the temperature and humidity of the air in the air duct can be adjusted using the air conditioning mechanism, so the temperature and humidity in the plant cultivation environment can be properly maintained. For example, it is possible to prevent the humidity in the cultivation environment from rising due to evaporation of water from the cultivated plants. Also, a temperature suitable for plant growth can be maintained.

According to the plant cultivation system configured in (9) above, the air is introduced from the first position into the cultivation chamber through the air inlet, is exhausted from the cultivation chamber through the air outlet, and reaches the second position. Carbon dioxide can be replenished from the third location without affecting environmental changes. Therefore, based on the measurement results at the first position and the second position, it becomes easy to accurately grasp the amount of carbon dioxide consumed by the photosynthesis of the plants in the cultivation room.

According to the plant cultivation system having the configuration (10) above, it becomes easy to grasp the actual growth situation of the plant during the cultivation period with high accuracy. Since the photosynthetic reaction has a great influence on plant growth, understanding the speed of the photosynthetic reaction and its changes is useful for accurately understanding the growth conditions of plants. In addition, since carbon dioxide in the air is consumed in the photosynthetic reaction, the state of the photosynthetic reaction of plants in the closed space is calculated based on the amount of carbon dioxide decrease per hour calculated from the measured value of the carbon dioxide concentration. can be estimated.

According to the plant cultivation system having the configuration (11) above, the illumination unit can irradiate the closed space with light necessary for plant growth, and the nutrient solution tank can supply the nutrient solution required for plant growth to the cultivation container. . In addition, since the illumination unit can irradiate the closed space with the light necessary for plant growth, the amount of photosynthesis can be measured under the same conditions as during cultivation.

According to the plant cultivation system having the configuration (12) above, it is possible to prevent the temperature in the closed space from rising due to the heat generated by the light source main body as the light is emitted. This significantly reduces the energy consumption required to maintain the proper temperature in the enclosed space.

According to the plant cultivation system having the configuration (13) above, the plants cultivated inside each of the plurality of cultivation rooms can be individually managed while maintaining an appropriate cultivation environment. Therefore, it becomes easy to simultaneously manage plants of different varieties in different cultivation environments, or to simultaneously manage a plurality of groups of plants of the same variety so that they can be harvested at different times.

According to the plant cultivation system having the above configuration (14), the cultivation environment control unit controls the growth of the plants so that they grow uniformly. It will be possible to make adjustments to equalize the quantity and stabilize the quality according to shipping standards.

The plant cultivation system of the present invention can grasp the actual growth status of plants, and can be used to adjust the harvest period of plants to be produced and to increase profits.

The above is a brief description of the present invention. Furthermore, the details of the present invention will be further clarified by reading the best mode for carrying out the invention described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a configuration example of main parts of a plant cultivation system according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view showing an enlarged cross-sectional structure of a portion of the lighting device. FIG. 3 is a flow chart showing an example of main operations of the plant cultivation system. FIG. 4 is a block diagram showing the configuration of the plant cultivation system of modification-1. FIG. 5 is a block diagram showing the configuration of the plant cultivation system of modification-2. FIG. 6 is a block diagram showing the configuration of the plant cultivation system of modification-3. FIG. 7 is a block diagram showing the configuration of the plant cultivation system of Modification-4.

Specific embodiments of the present invention will be described below with reference to each drawing.
<Configuration of plant cultivation system>
FIG. 1 shows a configuration example of a plant cultivation device 100, which is a main part of a plant cultivation system according to an embodiment of the present invention.

The plant cultivation apparatus 100 shown in FIG. 1 includes one cultivation chamber 10 necessary for cultivating plants 15. This cultivation room 10 has a closed space 13 formed inside a box-shaped housing 11 . That is, the box-shaped housing 11 is a closed space 13 surrounded by a plurality of walls, a bottom, a ceiling, etc., which are made of a material that has heat insulation and light shielding properties, and also has airtightness and watertightness to some extent. forming The box-shaped housing 11 is made of, for example, a material such as a resin such as urethane foam, or a fiber-based heat insulating material such as glass wool or rock wool. In order to efficiently irradiate the plants 15 with the generated light inside the cultivation chamber 10, each part of the inner wall of the box-shaped housing 11 is made of a material having a high light reflectance.

Therefore, the closed space 13 in the box-shaped housing 11 is isolated from the outside air, and the air environment of the cultivation room 10, that is, the conditions such as carbon dioxide concentration, oxygen concentration, temperature, humidity, etc., are different from the outside air. ing.

As shown in FIG. 1, a cultivation container 12 capable of cultivating a plurality of plants 15 is installed near the bottom of the cultivation room 10 . In addition, a lighting device 14 is installed near the ceiling in the cultivation room 10 in order to irradiate the plant 15 with light necessary for growing it. Actually, the light source of the lighting device 14 is located outside the cultivation room 10 as will be described later. Light from the light source is guided into the cultivation room 10 by a light guide plate 18 arranged in the cultivation room 10 , and emitted from the ceiling in the cultivation room 10 toward the plant 15 below. The lighting device 14 is not limited to a configuration in which light from a light source provided outside the cultivation chamber 10 is guided into the cultivation chamber 10 by the light guide plate 18 and emitted to the plants 15. A configuration in which an LED light source is arranged above the plant 15 and the light is directly emitted from the LED light source to the plant 15 may be employed.

An air inlet 10a is formed on one wall surface of the cultivation room 10, and an air outlet 10b is formed on the opposite wall surface, in order to enable adjustment of the air environment in the cultivation room 10. A conduit outlet 21a of the air conduit 21 is connected to the air inlet 10a, and a conduit inlet 21b of the air conduit 21 is connected to the air outlet 10b.

As an example, the air conduit 21 is composed of a pipe or the like that is airtight and has a substantially constant cross-sectional area, and forms an air flow path for circulating the air inside the cultivation room 10 outside. That is, the air in the cultivation chamber 10 enters the air conduit 21 from the air outlet 10b through the conduit inlet 21b, passes through the flow path in the air conduit 21, reaches the conduit outlet 21a, and passes through the air inlet 10a. It is introduced again into the cultivation room 10 via the.

An air pump (AP) 22 and an air conditioner 23 are connected in the middle of the flow path of the air pipe 21 . The air pump 22 has a function of forming an air flow in the direction from the conduit outlet 21a toward the inside of the cultivation chamber 10 . The air conditioning unit 23 has a dehumidification/humidification function and a temperature control function for the air passing through the air conduit 21 .

Cylinders 24 and 25 are also connected to the air line 21 via a supply line 26 . Cylinder 24 can supply carbon dioxide (CO ₂ ) accumulated therein to supply line 26 as needed. The cylinder 25 can supply the oxygen (O ₂ ) accumulated therein to the supply line 26 as needed. Each cylinder 24 , 25 is provided with a solenoid valve for controlling the supply of carbon dioxide and oxygen from each cylinder 24 , 25 to the supply line 26 , or the amount of supply. A solenoid valve is controlled by the control part 50 as an example.

In addition, the plant cultivation device 100 is equipped with a plurality of sensors 31 and 32 to enable measurement of the air environment within the closed space 13. The sensor 31 has a function of measuring the concentration of carbon dioxide, and the sensor 32 has a function of measuring the concentration of oxygen.

In the plant cultivation apparatus 100 shown in FIG. 1, the sensors 31 and 32 are configured to be capable of measuring at the air environment measurement points 33 and 34 and the supplementary air measurement point 35, respectively. A plurality of sets of sensors 31 and 32 may be prepared in advance, and independent sensors 31 and 32 may be individually installed near the air environment measurement points 33 and 34 and the supply air measurement point 35, respectively. Alternatively, a sensor capable of measuring at a plurality of measurement points may be used, that is, the sensor may be used in common. Further, sensors for detecting the temperature, humidity, carbon dioxide concentration, etc. in the internal environment of the closed space 13 may be added. Furthermore, sensors for enabling measurement of the air environment in the closed space 13 may be installed at locations other than the air environment measurement points 33 and 34 and the supplementary air measurement point 35, i.e., outside the air pipeline 21. good. As an example, the ceiling of the cultivation room 10 is provided with an outlet and an inlet for the air in the closed space 13, and the carbon dioxide concentration or the oxygen concentration is added to any point in the air pipeline connecting these outlets and inlets. A sensor may be installed for detection. With this sensor, the carbon dioxide concentration or oxygen concentration after being affected by photosynthesis by the plants 15 in the cultivation room 10 can be measured.

By driving the air pump 22, an air flow can be formed in the cultivation chamber 10 in the direction from the air inlet 10a to the air outlet 10b. In particular, in the example of FIG. 1, the width in the cultivation room 10, that is, the dimension in the left-right direction in FIG. 1, and the depth, that is, the dimension in the direction perpendicular to the paper surface in FIG. Since the height is relatively small, a stable horizontal air flow can be formed in the cultivation chamber 10 .

When the plant 15 is cultivated, carbon dioxide and oxygen are absorbed or discharged, and water (H ₂ O) is discharged as the plant 15 performs photosynthesis. Therefore, if changes in carbon dioxide concentration and changes in oxygen concentration can be grasped, photosynthesis can be evaluated based thereon, and the actual growth state of the plant 15 can be estimated.

In the plant cultivation apparatus 100 shown in FIG. 1, the air environment measurement point 33 is on the air pipeline 21 near the air inlet 10a, so the carbon dioxide concentration before being affected by photosynthesis by the plants 15 in the cultivation room 10 , and oxygen concentration can be stably measured at the air environment measuring point 33 . In addition, since the air environment measurement point 34 is on the air pipeline 21 near the air outlet 10b, the carbon dioxide concentration and oxygen concentration after being affected by photosynthesis by the plants 15 in the cultivation room 10 are measured at the air environment measurement point 34 can be measured in a stable state.

Therefore, for example, during the irradiation of light by the lighting device 14, based on the difference between the carbon dioxide concentration measured at the air environment measurement point 33 and the carbon dioxide concentration measured at the air environment measurement point 34, the inside of the cultivation room 10 It is possible to evaluate photosynthesis by the entire plant 15 and estimate the growth status. Similarly, for example, based on the difference between the oxygen concentration measured at the air environment measurement point 33 and the oxygen concentration measured at the air environment measurement point 34, photosynthesis by the entire plant 15 in the cultivation room 10 is evaluated. It is also possible to extrapolate the situation.

In addition, carbon dioxide in the air in the cultivation room 10 is consumed by photosynthesis of the plants 15, and the carbon dioxide concentration decreases. However, by supplying carbon dioxide from the cylinder 24 to the air supply point 21c on the air pipe 21, it is possible to control the concentration of carbon dioxide suitable for the growth of the plant 15 to be maintained. In addition, when the oxygen concentration in the air in the cultivation room 10 decreases due to the respiration of the plants 15, by supplying oxygen from the cylinder 25 to the air supply point 21c on the air pipe 21, the growth of the plants 15 is improved. It can be controlled to maintain a suitable oxygen concentration.

That is, since the carbon dioxide concentration and the oxygen concentration can be measured at the supply air measurement point 35 located near the air supply point 21c, carbon dioxide is supplied from the cylinder 24 when the carbon dioxide concentration decreases based on the measurement results. Oxygen can be replenished from the cylinder 25 when the oxygen concentration is low.

A nutrient solution tank 41 is installed adjacent to the cultivation room 10 as shown in FIG. One end of the nutrient solution supply pipe 42 is connected to the nutrient solution tank 41 , and the other end is connected to the cultivation container 12 via the nutrient solution inlet 10 c of the cultivation chamber 10 . One end of the waste liquid pipe 43 is connected to the cultivation container 12 via the waste liquid outlet 10 d of the cultivation chamber 10 , and the other end is connected to the nutrient solution tank 41 .

Also, the fertilizer supply source 45 is connected to the fertilizer supply section 46 and the fertilizer supply source 45 is connected to the nutrient solution tank 41 via the fertilizer supply pipe 47 . The fertilizer supply unit 46 can take in fertilizer necessary for promoting the growth of the plants 15 in the cultivation chamber 10 from the fertilizer supply source 45 and supply the fertilizer to the nutrient solution tank 41 as necessary. Then, for example, pH (hydrogen ion concentration index) and EC (electrical conductivity) in the nutrient solution tank 41 are controlled to be target values.

The nutrient solution 41 a in the nutrient solution tank 41 is driven by the pump 44 to supply the required amount to the inside of the cultivation container 12 via the nutrient solution supply pipe 42 . Moreover, the waste liquid discharged from the cultivation container 12 is collected in the nutrient solution tank 41 via the waste liquid pipe 43 .

On the other hand, a control unit 50 having a function of controlling the plant cultivation device 100 is connected to the plant cultivation device 100 in a communicable state. The control unit 50 can be configured by a personal computer installed near the plant cultivation apparatus 100, which is a plant factory, or by cloud application software using a server connected to the Internet. can. Furthermore, it is conceivable to configure them by combining them.

In the plant cultivation system shown in FIG. 1, various information including measured values of the sensors 31 and 32 on the plant cultivation device 100 are sent to the control unit 50 as the measurement result SG1. Based on the measurement result SG1, the control unit 50 determines the cultivation environment of the plant 15 in the plant cultivation apparatus 100, that is, the carbon dioxide concentration, oxygen concentration, temperature, humidity, and intensity of the light emitted in the air in the closed space 13. grasp. In addition, the control unit 50 estimates the actual growth state of the plant 15 by evaluating the photosynthesis of the plant 15 based on changes in the carbon dioxide concentration. And the control part 50 produces|generates and outputs the information of control parameter SG2 required in order to cultivate the plant 15 in an optimal state.

For example, the control unit 50 calculates the cultivation conditions necessary for harvesting the plants 15 at the optimum harvesting period according to the varieties of the plants 15 actually cultivated in the cultivation chamber 10, and sets the control parameters SG2. reflect. That is, the carbon dioxide concentration, the oxygen concentration, the temperature, the humidity, the intensity of the irradiated light, etc. representing the environment in the closed space 13 necessary for cultivating the plant 15 in an optimal state are output as the control parameter SG2. be.

A local control unit (not shown) that manages the state near the plant cultivation apparatus 100 controls each part of the plant cultivation apparatus 100 according to the control parameter SG2 input from the control unit 50. That is, the temperature adjustment amount and humidity adjustment amount of the air conditioning unit 23, the flow rate of the air pump 22, the supply amount of carbon dioxide and oxygen from the cylinders 24 and 25, the light emission intensity of the lighting device 14, etc. are adjusted according to the control parameter SG2. . The amount of fertilizer supplied from the fertilizer supply unit 46 to the nutrient solution tank 41 and the amount of nutrient solution 41a supplied from the nutrient solution tank 41 to the cultivation container 12 are also controlled according to the control parameter SG2 input from the control unit 50. can be adjusted.

<Structure of Main Part of Lighting Device>
FIG. 2 shows a partial cross-sectional structure of the illumination device 14 attached to the plant cultivation apparatus 100 of FIG.
In the example shown in FIG. 2, a thin light source board 14b is fixed substantially in the center of the opening of the heat sink 14c, and the LED light source section 14a is installed on the light source board 14b. The light source substrate 14b is an electrically insulating resin plate on which a circuit pattern such as copper foil is formed. The actual LED light source section 14a is composed of a large number of LED elements arranged in a line on the light source substrate 14b. Each LED element can emit blue, white, or ultraviolet light in the X-axis direction.

As shown in FIG. 2, the light guide plate 18 is sandwiched and fixed between the heat sinks 14c at the top and bottom, with the side end face 18a facing the light emitting surface of the LED light source part 14a with a gap. The light guide plate 18 has a uniform thickness in the Z-axis direction over its entirety, and the dimension in the thickness direction is, for example, several mm to 10 mm.

Also, a wavelength conversion film 14d is arranged between the LED light source section 14a and the side end surface 18a of the light guide plate 18 . This wavelength conversion film 14 d has a function of converting the wavelength of blue, white, or ultraviolet light emitted from the LED light source section 14 a into light of a spectrum suitable for the growth of the plant 15 . It is possible to switch the spectrum of the light with which the plant 15 is irradiated by attaching and detaching the wavelength conversion film 14d or by exchanging the type of film.

The light emitted from the LED light source section 14a is wavelength-converted by the wavelength conversion film 14d, enters the light guide plate 18 from the side end face 18a, propagates while being repeatedly reflected, and is formed below the light guide plate 18. The light is emitted downward from the diffusion surface 18b, and the plant 15 is irradiated with the light. The upper surface of the light guide plate 18 is a reflecting surface 18c.

On the other hand, since the LED light source section 14a generates a large amount of heat when emitting light, it is necessary to dissipate the heat to the outside air with the heat sink 14c and suppress the temperature rise. Also, if the heat generated by the LED light source unit 14a affects the temperature in the cultivation chamber 10, a relatively large amount of energy is required for air conditioning to maintain the temperature in the cultivation chamber 10 at a temperature suitable for cultivating the plants 15. Become. However, as shown in FIG. 2, the LED light source section 14a of the lighting device 14 is arranged in the space outside the cultivation room 10, so the heat generated by the LED light source section 14a does not affect the temperature inside the cultivation room 10. can be avoided. Therefore, in the plant cultivation apparatus 100 of FIG. 1, the energy consumption in the air conditioning unit 23 when cultivating the plants 15 can be reduced, and the running cost of this plant factory can be reduced.

<Operation example of the plant cultivation system>
FIG. 3 shows an example of main operations in the plant cultivation system of FIG. The operations shown in FIG. 3 mainly correspond to the contents of processing in the control unit 50 .

In step S11, the control unit 50 acquires the carbon dioxide concentration information V1in at the entrance of the cultivation room obtained by the sensor 31 measuring at the air environment measuring point 33 as part of the measurement result SG1. In the next step S12, the control unit 50 acquires the carbon dioxide concentration information V1out at the exit of the cultivation room obtained by the sensor 31 measuring at the air environment measuring point 34 as part of the measurement result SG1.

In step S13, the control unit 50 acquires the oxygen concentration information V2in at the entrance of the cultivation room obtained by the sensor 32 measuring at the air environment measuring point 33 as part of the measurement result SG1. In the next step S14, the control unit 50 acquires the oxygen concentration information V2out at the exit of the cultivation room obtained by the sensor 32 measuring at the air environment measuring point 34 as part of the measurement result SG1.

In step S15, the control unit 50 calculates an evaluation value of the photosynthetic rate of the plants 15 in the cultivation room 10 based on the information of the measurement results obtained in steps S11 to S14.
The plant 15 irradiated with light grows while performing photosynthesis in the air of the cultivation environment. Therefore, it is photosynthesis that greatly contributes to the growth rate of the plant 15 . During photosynthesis, carbon dioxide in the air is absorbed and moisture is discharged. Therefore, for example, it is possible to evaluate the photosynthetic rate as an estimated value by a known technique based on the result of measuring the consumption of carbon dioxide. Acquisition of the oxygen concentration information V2in and V2out in steps S13 and S14 is not essential.

Specifically, the control unit 50 supplies the difference between the carbon dioxide concentration information V1in at the cultivation room entrance and the carbon dioxide concentration information V1out at the cultivation room exit to the cultivation room 10 near the air environment measurement point 33 . Accurately calculate the amount of carbon dioxide consumed per unit time based on air flow velocity and other factors. This consumption can be related to a photosynthetic rate estimate. Incidentally, when calculating the consumption of carbon dioxide, the result of detection by an air volume sensor may be used. For example, an air volume sensor is installed at the cultivation room entrance and the cultivation room exit, and each air volume at the cultivation room entrance and the cultivation room exit is calculated. Calculate the inflow and emission of carbon dioxide from each calculated air volume and the carbon dioxide concentration detected by the carbon dioxide concentration sensor, calculate the consumption of carbon dioxide as the difference between the inflow and emission, and calculate the photosynthetic rate can be evaluated.

The control unit 50 compares the photosynthetic rate evaluation value V3 calculated in step S15 with the reference value V3r (steps S16 to S18). This reference value V3r is set in accordance with the target cultivation environment for harvesting the plant 15 in a state in which the quality such as the size of the plant 15 falls within a predetermined standard, for example, at the planned optimal harvesting period. Then, the control unit 50 sequentially determines.

If the state is "evaluation value V3<reference value V3r", the current photosynthetic rate is insufficient, so the control unit 50 proceeds from step S17 to step S19. Then, the control unit 50 automatically adjusts various control parameters of the cultivation room environment so as to increase the photosynthetic rate. For example, "increase the amount of light emitted by the lighting device 14", "increase the concentration of carbon dioxide in the air supplied from the air conduit 21 to the air inlet 10a", and "supply from the air conduit 21 to the air inlet 10a". The controller 50 changes various control parameters in order to enable adjustments such as "increase air flow velocity".

Also, if "evaluation value V3>reference value V3r", the current photosynthetic rate is excessive, so the control unit 50 proceeds from step S18 to step S20. Then, the control unit 50 automatically adjusts various control parameters of the cultivation room environment so as to suppress the photosynthetic rate. For example, “reduce the amount of light emitted by the lighting device 14”, “reduce the concentration of carbon dioxide in the air supplied from the air conduit 21 to the air inlet 10a”, and “supply from the air conduit 21 to the air inlet 10a The controller 50 changes various control parameters in order to enable adjustment such as "lowering the flow velocity of the air".

The control unit 50 performs control so that the adjustment results in steps S19 and S20 are reflected in the actual cultivation environment of the plant cultivation apparatus 100. That is, the control unit 50 gives the changed control parameter SG2 to the plant cultivation device 100 in the next step S21, and the plant cultivation device 100 follows the control parameter SG2 input from the control unit 50 to change the air environment of the cultivation room 10 and the lighting device. 14 to control the amount of light.

Although the present embodiment describes a case where various control parameters are changed based on the results of photosynthesis evaluation, the present invention is not limited to this. That is, for example, the results of photosynthetic evaluation can be used only for adjusting the harvest time.

<Variation-1 Plant Cultivation System>
FIG. 4 shows the configuration of the plant cultivation system of modification-1. In the configuration of FIG. 4, a sensor 37 is added to the plant cultivation device 100, but the configuration other than that is the same as that of FIG.

The added sensor 37 has a function of detecting moisture (H ₂ O), and in the example of FIG. can do.

The control unit 50 shown in FIG. 4 controls the air conditioning unit 23 based on the humidity information obtained by the measurement of the sensor 37 so that the cultivation environment of the plant 15 has an appropriate humidity.

Accompanying the photosynthesis of the plant 15, water is discharged from the stomata of the leaves of the plant 15, and transpiration of water occurs. Therefore, the humidity of the air environment increases in the cultivation room 10 which is the closed space 13 . On the other hand, in an environment where the humidity is too low, the stomata of the plant 15 are closed. In addition, in an environment with too high humidity, moisture cannot be discharged from the stomata of the plant 15, and at the same time, the stomata cannot absorb carbon dioxide in the air. That is, when the humidity is not appropriate, the photosynthesis of the plant 15 is inhibited, and the growth of the plant 15 is adversely affected.

In the plant cultivation system of FIG. 4, the humidity in the cultivation environment of the plants 15 can be appropriately maintained using the measurement results of the sensor 37, so it becomes easy to cultivate the plants 15 in a desirable air environment.

In addition, since the difference in humidity measured at the two air environment measurement points 33 and 34 can be used to detect changes in the amount of moisture associated with photosynthesis of the plants 15 in the cultivation room 10, the information can be used to estimate the photosynthetic rate. It is also possible to help

<Variation-2 Plant Cultivation System>
FIG. 5 shows the configuration of the plant cultivation system of modification-2.
The plant cultivation system shown in FIG. 5 is configured on the assumption that a plurality of the plant cultivation apparatuses 100 shown in FIG. 1 or 4 are prepared in advance and these are operated simultaneously. The multiple-environment control unit 51 shown in FIG. 5 centrally controls a plurality of plant cultivation apparatuses 100 in mutually independent environments by one multiple-environment control unit 51 . The multiple-environment control unit 51 can be realized using a device such as a personal computer installed near the plant cultivation device 100, as in the case of the control unit 50 in FIG. It is also possible to implement functions.

A plurality of plant cultivation apparatuses 100A, 100B, 100C, and 100D shown in FIG. 5 each correspond to the plant cultivation apparatus 100 of FIG. 1 or FIG. In other words, the plurality of plant cultivation apparatuses 100A to 100D each have an independent closed space 13 cultivation room 10 . Moreover, the plurality of plant cultivation apparatuses 100A to 100D are independent of each other in terms of the air environment in each closed space 13, the intensity of the light emitted by the lighting device 14, and the environment inside the cultivation container 12, respectively.

Therefore, when the plant cultivation system of FIG. 5 is used, in each cultivation chamber 10 of the plurality of plant cultivation apparatuses 100A to 100D, for example, plants 15 of the same variety with different harvest periods are divided into a plurality of groups and cultivated simultaneously. Alternatively, a plurality of different types of plants 15 can be divided into a plurality of groups and cultivated at the same time.

In the plant cultivation system of FIG. 5, the plant cultivation device 100A belonging to the A group transmits the information measured by the sensors 31, 32, etc. inside it to the multiple environment control unit 51 as the measurement result SG1-A. The multiple environment control unit 51 evaluates the photosynthesis of the A group based on the measurement result SG1-A input from the plant cultivation apparatus 100A. In addition, the multi-environment control unit 51 reflects the evaluation result to generate a control parameter SG2 for bringing the growth status of the plants 15 of the A group closer to the target conditions such as the harvest period, and provides the control parameter SG2 to the plant cultivation apparatus 100A. Furthermore, the multi-environment control unit 51 accumulates information on the growth status and cultivation environment of the plants 15 in the A group, and reflects the information in future control.

Similarly to the above, the plant cultivation device 100B belonging to the B group transmits the information measured by the sensors 31, 32, etc. inside it to the multiple environment control unit 51 as the measurement result SG1-B. The multiple environment control unit 51 evaluates the photosynthesis of the B group based on the measurement result SG1-B input from the plant cultivation apparatus 100B. In addition, the multi-environment control unit 51 reflects the evaluation result to generate a control parameter SG2 for bringing the growth state of the plant 15 of the B group closer to the target condition, and provides the control parameter SG2 to the plant cultivation apparatus 100B. Furthermore, the multi-environment control unit 51 accumulates information on the growth status and cultivation environment of the plants 15 of the B group, and reflects the information in future control.

The plant cultivation device 100C belonging to the C group transmits the information measured by the sensors 31, 32, etc. inside it to the multiple environment control unit 51 as the measurement result SG1-C. The multi-environment control unit 51 evaluates the photosynthesis of the C group based on the measurement result SG1-C input from the plant cultivation device 100C. In addition, the multi-environment control unit 51 reflects the evaluation result to generate a control parameter SG2 for bringing the growth state of the plant 15 of the C group closer to the target condition, and provides the control parameter SG2 to the plant cultivation apparatus 100C. Furthermore, the multi-environment control unit 51 accumulates information on the growth status and cultivation environment of the plants 15 of the C group, and reflects the information in future control.

The plant cultivation device 100D belonging to the D group transmits the information measured by the sensors 31, 32, etc. inside it to the multiple environment control unit 51 as the measurement result SG1-D. The multiple environment control unit 51 evaluates the photosynthesis of the D group based on the measurement result SG1-D input from the plant cultivation device 100D. In addition, the multi-environment control unit 51 reflects the evaluation result to generate a control parameter SG2 for bringing the growth state of the plant 15 of the B group closer to the target condition, and provides the control parameter SG2 to the plant cultivation device 100D. Furthermore, the multi-environment control unit 51 accumulates information on the growth status and cultivation environment of the plants 15 in the D group, and reflects the information in future control.

When using the plant cultivation system shown in FIG. 5, for example, the plants 15 of groups A to D can be cultivated in individually optimized environments by dividing the cultivation environment for each group. Therefore, it becomes easy to unify the amount of growth of the plants 15 for each group, stabilize the quality such as the plant size in accordance with the shipping standards of the plants 15 for each group, and adjust the harvest time for each group. Furthermore, it also becomes possible to simultaneously cultivate a plurality of varieties of plants 15 having different appropriate cultivation conditions in an optimum environment. In addition, by centrally managing the plant cultivation apparatuses 100A to 100D of a plurality of groups with one multiple environment control unit 51, it is possible to reduce the management cost and adjust the balance of the cultivation conditions among the groups. become.

In addition, since each cultivation chamber 10 of the plurality of plant cultivation apparatuses 100A to 100D forms an independent closed space 13 and their environments are independently controlled, they are not affected by the layout. Therefore, for example, each cultivation chamber 10 of a plurality of plant cultivation apparatuses 100A to 100D can be arranged in a vertically stacked state.

In the case of a general plant factory, for example, if plants are cultivated on a plurality of shelves in which a plurality of cultivation containers are arranged in a vertical direction, the cultivation environment may change depending on the height and location of each cultivation container or each shelf. Because of this, uniform cultivation conditions cannot be achieved throughout. However, in the case of the plant cultivation system of FIG. 5, the environment of each cultivation room 10 of the plurality of groups of plant cultivation apparatuses 100A to 100D is not affected by differences in height and location. For this reason, in the case of the plant cultivation system of FIG. 5, it is possible to create a uniform environment as a whole, or to simultaneously create environments that are intentionally different from each other.

<Variation-3 Plant Cultivation System>
FIG. 6 shows the configuration of the plant cultivation system of modification-3.
In the plant cultivation device 200 shown in FIG. 6, the air flow path of the air conditioning unit 23A is connected to the closed space 13 inside the cultivation room 10 via air pipes 21A and 21B. The air conditioning unit 23A has dehumidification and temperature control functions.

That is, the air in the closed space 13 is introduced into the air conditioning section 23A through the air conduit 21A, and the air after the temperature and humidity have been appropriately adjusted flows from the air conditioning section 23A through the air conduit 21B into the cultivation room 10. to adjust the environment for cultivating the plant 15.

Also, a cylinder 24 for replenishing carbon dioxide is connected to the air conditioning section 23A via a predetermined pipe. Therefore, when the concentration of carbon dioxide in the air introduced into the air conditioning section 23A through the air conduit 21A is low, carbon dioxide is replenished from the cylinder 24. FIG. Thereby, the air with increased carbon dioxide concentration can be supplied from the air conditioning unit 23A to the cultivation room 10 via the air conduit 21B.

In the plant cultivation apparatus 200 of FIG. 6, the supplementary air measurement point 35A is arranged inside the cultivation room 10 near the outlet of the air pipe 21B. The temperature, humidity, and carbon dioxide concentration of the air at the make-up air measurement point 35A can be measured using the sensors 31, 32, and 37 shown in FIG. 4, for example.

In the example of FIG. 6, the sensor 30 is installed in the cultivation room 10 at a position opposite to the supply air measurement point 35A. This sensor 30 has the function of measuring the temperature, humidity, and carbon dioxide concentration of the air, and further has the function of transmitting the data of the measurement results to the outside of the cultivation room 10 using wireless communication. ing.

A sensor 30A is installed in the nutrient solution tank 41. This sensor 30A has a function of measuring the hydrogen ion concentration index (pH) and electrical conductivity (EC) in the nutrient solution 41a in the nutrient solution tank 41, and furthermore, the data of the measurement results are transmitted using wireless communication. It also has a function of transmitting to the outside of the nutrient solution tank 41 .

In the case of the plant cultivation apparatus 200 shown in FIG. 6, for example, based on the time-series change in the carbon dioxide concentration detected by the sensor 30 at one or a plurality of locations in the cultivation chamber 10, the carbon dioxide accompanying photosynthesis of the plant 15 The control unit 50 grasps the change in carbon concentration. As an example of a time-series change in the carbon dioxide concentration detected by the sensor 30, the time from the photosynthesis start time on the same day, that is, the time at which the lighting device 14 is turned on, to the photosynthesis end time, that is, the time at which the lighting device 14 is turned off. of carbon dioxide concentration changes.

The measurement data transmitted by each sensor 30, 30A by wireless communication is transmitted, for example, directly to the control unit 50 shown in FIG. 1 or via a predetermined communication relay device. Therefore, in the plant cultivation apparatus 200 of FIG. 6 as well, the control unit 50 can grasp the air environment in the cultivation room 10 representing the cultivation environment of the plant 15 and the environmental state of the nutrient solution 41a. Then, the control unit 50 evaluates the photosynthesis of the plants 15 in the cultivation chamber 10 in the plant cultivation apparatus 200 based on the change in the carbon dioxide concentration, grasps the growth state of the plants 15, and outputs the result of the cultivation chamber 10. Control to reflect the cultivation environment.

<Variation-4 Plant Cultivation System>
FIG. 7 shows the configuration of the plant cultivation system of modification-4. In the configuration of FIG. 7, the sensor 31 is not provided in the plant cultivation apparatus 100, but only the sensor 32 is provided, but the other configuration is the same as that of FIG.

In the plant cultivation apparatus 100 shown in FIG. 7, the sensor 32 is configured to be able to measure the concentration of oxygen at each of the air environment measurement points 33 and 34 and the supplementary air measurement point 35. That is, the sensor 32 has a function of measuring the concentration of oxygen, and the plant cultivation apparatus 100 shown in FIG. 7 is not provided with a sensor that measures the concentration of carbon dioxide. By providing the sensor 32 for measuring at least the concentration of oxygen in this manner, changes in the oxygen concentration can be grasped, and photosynthesis can be evaluated based thereon.

As described above, when cultivating the plants 15, carbon dioxide and oxygen are absorbed or discharged and water (H2O) is discharged as the plants 15 perform photosynthesis. Therefore, for example, during light irradiation by the lighting device 14, based on the difference between the oxygen concentration measured at the air environment measurement point 33 and the oxygen concentration measured at the air environment measurement point 34, the plant 15 in the cultivation room 10 It is possible to assess overall photosynthesis and estimate growth status.

More specifically, in the plant cultivation apparatus 100 shown in FIG. 7, the control unit 50 does not acquire the carbon dioxide concentration information V1in and V1out in the operation example described with reference to FIG. Get V2in and V2out. Based on these pieces of information, the control unit 50 can similarly calculate the oxygen discharge amount and evaluate the photosynthetic rate.

Although the plant cultivation system of modification-4 has been described as having only the sensor 32, it is not limited to this. That is, the plant cultivation apparatus 100 includes at least a sensor 31 configured to measure the concentration of carbon dioxide, a sensor 32 configured to measure the concentration of oxygen, or a sensor 37 having a function of detecting moisture (H2O). Any one of In other words, the plant cultivation apparatus 100 may have at least one of the sensors 31, 32, and 37 described above, and may have two or more different sensors among them. may

When the plant cultivation apparatus 100 has only the sensor 37 having the function of detecting moisture (H2O), for example, during the irradiation of light by the lighting device 14, the humidity measured at the air environment measurement point 33 and the air environment measurement Based on the difference from the humidity measured at the point 34, it is possible to evaluate the photosynthesis by the entire plant 15 in the cultivation room 10 and estimate the growth condition. More specifically, in the operation example described with reference to FIG. 3, the information on the carbon dioxide concentration V1in, V1out and the information on the oxygen concentration V2in, V2out are not acquired, and the humidity information is acquired instead. Based on these pieces of information, the controller 50 can similarly calculate the water discharge amount and evaluate the photosynthetic rate.

<Advantages of Plant Cultivation System>
According to the plant cultivation systems shown in FIGS. 1, 4, 6, and 7, while cultivating a large number of plants 15 in the cultivation chamber 10 in an appropriate cultivation environment, the plants 15 in the cultivation chamber 10 The actual photosynthetic state can be evaluated based on the detected data, and the results can be reflected in the adjustment of the cultivation season and the cultivation environment. Therefore, for example, it is possible to automatically adjust the cultivation environment so that the yield, quality, and harvest time of the plants 15 being cultivated are optimal, and to control various varieties of plants 15 under optimum conditions for each variety. It becomes easy to adjust automatically to cultivate.
In particular, in the above plant cultivation system, since the lighting device 14 including the light guide plate 18 is provided in the cultivation room 10, measurements for evaluating photosynthesis can be performed under the same light conditions as those used during cultivation. Therefore, accurate measurement is possible. If the plant cultivation system of this embodiment is not used, it is conceivable to cover part of the plant being cultivated with a measurement chamber or the like for measurement. In this case, if the lighting device is placed outside the chamber or the like, part of the light emitted from the lighting device is reflected by the chamber or the like, so the light conditions during cultivation and the light conditions during measurement are different. do not match, and the actual growth conditions are not reflected correctly in the measurement results. However, according to the plant cultivation system of the present embodiment, as described above, accurate measurement can be performed under the light conditions during cultivation, so it is possible to grasp the actual growth status of the plant.

<Supplementary explanation>
Here, the features of the embodiment of the plant cultivation system according to the present invention described above are summarized and listed briefly in [1] to [14] below.
[1] A cultivation chamber (10) inside which forms a closed space (13) isolated from the outside air, a cultivation container (12) which is arranged in the closed space and which can be used for cultivating a plant (15), A plant cultivation system comprising
A plant comprising a cultivation environment control unit (control unit 50) that forms a cultivation environment necessary for cultivating the plant in the closed space and performs measurements for evaluating photosynthesis of the plant in the cultivation environment. cultivation system.

[2] an air conduit (21) for air circulation, one end of which is connected to the air outlet (10b) of the cultivation chamber and the other end of which is connected to the air inlet (10a) of the cultivation chamber;
An air environment adjustment unit (air conditioning unit 23) that is connected to the air duct and adjusts the air environment necessary for the growth of the plant in the closed space,
The cultivation environment control unit includes a photosynthesis evaluation unit (control unit 50) that evaluates photosynthesis in the plant in the closed space based on the air environment state detected at at least two locations in the air duct.
The plant cultivation system according to [1] above.

[3] The cultivation environment control unit controls at least the air environment adjustment unit so that the evaluation result of the photosynthesis evaluation unit is reflected in the adjustment of the cultivation environment for the plant in the closed space (S15 to S21 ),
The plant cultivation system according to [2] above.

[4] The air environment adjustment unit includes a carbon dioxide supply source (cylinder 24) capable of supplying carbon dioxide to the air pipeline, and an oxygen supply source (cylinder 24) capable of supplying oxygen to the air pipeline. 25),
The plant cultivation system according to [2] or [3] above.

[5] The photosynthesis evaluation unit detects at least one of carbon dioxide concentration, oxygen concentration and humidity as the air environmental conditions.
The plant cultivation system according to any one of [2] to [4] above.

[6] The photosynthesis evaluation unit detects the carbon dioxide concentration at a position near the air inlet of the cultivation room as a first carbon dioxide concentration (S11), and the carbon dioxide at a position near the air outlet of the cultivation room. Having a carbon dioxide detection unit (sensor 31) that detects the carbon concentration as a second carbon dioxide concentration (S12),
The plant cultivation system according to any one of [2] to [5] above.

[7] The photosynthesis evaluation unit detects the oxygen concentration in the vicinity of the air inlet of the cultivation chamber as a first oxygen concentration (S13), and the oxygen concentration in the vicinity of the air outlet of the cultivation chamber. as a second oxygen concentration (S14) having an oxygen detection unit (sensor 32),
The plant cultivation system according to any one of [2] to [6] above.

[8] The air environment adjustment unit has an air conditioning mechanism (air conditioning unit 23) that adjusts the temperature and humidity of the air passing through the air pipeline.
The plant cultivation system according to any one of [2] to [7] above.

[9] The photosynthesis evaluation unit detects a carbon dioxide concentration at a first position (duct outlet 21a) near the air inlet of the cultivation room as the first carbon dioxide concentration, and near the air outlet of the cultivation room. has a carbon dioxide detection unit (sensor 31) that detects the carbon dioxide concentration at the second position (pipe inlet 21b) as the second carbon dioxide concentration,
The air environment adjustment unit includes a carbon dioxide supply source (cylinder 24) capable of supplying carbon dioxide to a third position (air supply point 21c) located between the first position and the second position on the air pipeline. , an oxygen supply source (cylinder 25) capable of supplying oxygen to the third position, and a supply-side carbon dioxide detector (sensor 31) capable of detecting at least carbon dioxide concentration near the third position,
The plant cultivation system according to any one of [2] to [8] above.

[10] The photosynthesis evaluation unit, the plant in the closed space based on the amount of carbon dioxide reduction per hour calculated from the measured values of at least the first carbon dioxide concentration and the second carbon dioxide concentration Evaluate photosynthesis in (S15),
The plant cultivation system according to [6] above.

[11] A lighting unit (lighting device 14) that irradiates the closed space with light necessary for growing the plant;
a nutrient solution tank (41) connected to the cultivation container via a predetermined liquid passage,
The plant cultivation system according to any one of [1] to [10] above.

[12] The lighting unit includes a light source body (LED light source section 14a) arranged outside the closed space, and guides the light emitted from the light source body to the inside of the closed space and directs it to the plant in the closed space. Having a light guide mechanism (light guide plate 18) for irradiation,
The plant cultivation system according to [11] above.

[13] having a plurality of cultivation chambers (plant cultivation apparatuses 100A to 100D) each forming an independent closed space;
The cultivation environment control unit (multi-environment control unit 51) individually measures and evaluates the plant cultivation environments in the plurality of cultivation rooms and reflects them in control.
The plant cultivation system according to any one of [1] to [12] above.

[14] The cultivation environment control unit (control unit 50) controls the plant cultivation environment in the cultivation chamber so as to uniform the growth of the plant based on the results of evaluating the photosynthesis of the plant (S15 to S21),
The plant cultivation system according to any one of [1] to [13] above.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention. This application is based on a Japanese patent application (Japanese Patent Application No. 2021-053775) filed on March 26, 2021, the content of which is incorporated herein by reference.

REFERENCE SIGNS LIST 10 cultivation chamber 10a air inlet 10b air outlet 10c nutrient solution inlet 10d waste liquid outlet 11 box-like housing 12 cultivation container 13 closed space 14 lighting device 14a LED light source section 14b light source substrate 14c heat sink 14d wavelength conversion film 15 plant 18 light guide plate 18a side End surface 18b Diffusion surface 18c Reflective surface 21, 21A, 21B Air pipe 21a Pipe outlet 21b Pipe inlet 21c Air supply point 22 Air pump 23, 23A Air conditioning unit 24, 25 Cylinder 26 Supply pipe 30, 30A, 31, 32, 37 sensor 33, 34 air environment measurement point 35, 35A supply air measurement point 41 nutrient solution tank 41a nutrient solution 42 nutrient solution supply pipe 43 waste solution pipe 44 pump 45 fertilizer supply source 46 fertilizer supply unit 47 fertilizer supply pipe 50 controller 51 plural Environment control unit 100, 100A, 100B, 100C, 100D, 200 Plant cultivation device SG1 Measurement result SG2 Control parameter

Claims (14)

1. A plant cultivation system having a cultivation chamber inside which forms a closed space isolated from the outside air, and a cultivation container that is arranged in the closed space and can be used for cultivating plants,
   A plant cultivation system comprising: a cultivation environment control unit that forms a cultivation environment necessary for cultivating the plant in the closed space and performs measurements for evaluating photosynthesis of the plant in the cultivation environment.
2. an air conduit for air circulation, one end of which is connected to the air outlet of the cultivation chamber and the other end of which is connected to the air inlet of the cultivation chamber;
   an air environment adjustment unit connected to the air duct and adjusting an air environment necessary for the growth of the plant in the closed space;
   The cultivation environment control unit has a photosynthesis evaluation unit that evaluates photosynthesis in the plant in the closed space based on the air environment state detected in at least two locations in the air duct,
   The plant cultivation system according to claim 1.
3. The cultivation environment control unit controls at least the air environment adjustment unit so that the evaluation result of the photosynthesis evaluation unit is reflected in the adjustment of the cultivation environment for the plant in the closed space.
   The plant cultivation system according to claim 2.
4. The air environment adjustment unit has a carbon dioxide supply source capable of supplying carbon dioxide to the air pipeline and an oxygen supply source capable of supplying oxygen to the air pipeline.
   The plant cultivation system according to claim 2 or 3.
5. The photosynthesis evaluation unit detects at least one of carbon dioxide concentration, oxygen concentration and humidity as the air environmental condition,
   The plant cultivation system according to any one of claims 2 to 4.
6. The photosynthesis evaluation unit detects the carbon dioxide concentration at a position near the air inlet of the cultivation room as a first carbon dioxide concentration, and detects the carbon dioxide concentration at a position near the air outlet of the cultivation room as a second carbon dioxide concentration. Having a carbon dioxide detection unit that detects as carbon dioxide concentration,
   The plant cultivation system according to any one of claims 2 to 5.
7. The photosynthesis evaluation unit detects the oxygen concentration at a position near the air inlet of the cultivation room as a first oxygen concentration, and detects the oxygen concentration at a position near the air outlet of the cultivation room as a second oxygen concentration. Having an oxygen detection unit that detects as
   The plant cultivation system according to any one of claims 2 to 6.
8. The air environment adjustment unit has an air conditioning mechanism that adjusts the temperature and humidity of the air passing through the air conduit.
   The plant cultivation system according to any one of claims 2 to 7.
9. The photosynthesis evaluation unit detects the carbon dioxide concentration at a first position near the air inlet of the cultivation room as a first carbon dioxide concentration, and detects the carbon dioxide concentration at a second position near the air outlet of the cultivation room. Having a carbon dioxide detection unit that detects as a second carbon dioxide concentration,
   The air environment adjustment unit includes a carbon dioxide supply source capable of supplying carbon dioxide to a third location between the first location and the second location on the air conduit, and capable of supplying oxygen to the third location. an oxygen supply source, and a supply-side carbon dioxide detection unit capable of detecting at least carbon dioxide concentration in the vicinity of the third position,
   The plant cultivation system according to any one of claims 2 to 8.
10. The photosynthesis evaluation unit performs photosynthesis in the plant in the closed space based on the amount of carbon dioxide reduction per hour calculated from at least the first carbon dioxide concentration and the second carbon dioxide concentration measured value evaluate,
    The plant cultivation system according to claim 6.
11. a lighting unit that irradiates the closed space with light necessary for growing the plant;
    a nutrient solution tank connected to the cultivation container via a predetermined liquid passage,
    The plant cultivation system according to any one of claims 1 to 10.
12. The lighting unit has a light source body arranged outside the closed space, and a light guide mechanism for guiding the light emitted from the light source body to the inside of the closed space and irradiating the plant in the closed space.
    The plant cultivation system according to claim 11.
13. Having a plurality of the cultivation chambers each forming the independent closed space,
    The cultivation environment control unit measures and evaluates the plant cultivation environments in the plurality of cultivation rooms individually and reflects them in the control.
    The plant cultivation system according to any one of claims 1 to 12.
14. The cultivation environment control unit controls the plant cultivation environment in the cultivation room so as to uniform the growth of the plant based on the results of evaluating the photosynthesis of the plant.
    The plant cultivation system according to any one of claims 1 to 13.

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