Plant cultivation device and its control method

Abstract

The present invention provides a plant cultivation device that can ensure the necessary daylight hours while preventing physiological disorders in plants caused by an increase in cumulative light intensity. [Solution] The plant cultivation device comprises a housing 11 on which the plant 21 is installed, a light source 14 for illuminating the plant 21, a motor for rotating the housing 11, a length measuring sensor 15 capable of measuring the height of the plant, and a control unit that controls the illumination of the light source 14 and the rotational drive of the motor. The light source 14 is positioned in a location on the housing 11 that allows for the distinction between the light period and the dark period of the plant 21 by its rotational position. The control unit limits the amount of rotation of the motor, which is obtained within a range that does not cause physiological damage to the plant 21 by the cumulative amount of light irradiated onto the plant 21 from the light source 14 during the light period, according to the height of the plant 21 measured by the length measuring sensor 15.

Description

Technical Field

[0001] The present disclosure relates to a plant cultivation device and a control method thereof.

Background Art

[0002] As a device that can stably grow vegetables and the like regardless of the weather, many plant cultivation devices used in so-called plant factories are known. Although there are various forms of plant factories, for example, as described in Patent Document 1, a case of a plant factory in which seedlings are planted in a rotating housing is known as a form that can efficiently produce even in a narrow space. A configuration in which plants are continuously illuminated, such as the technology of Patent Document 1, is suitable for plants that do not cause physiological disorders even under continuous light, such as lettuce.

[0003] On the other hand, depending on the type of plant, for example, tomatoes are optimal with a day length of 16 hours, and there are plants that develop physiological disorders when continuously irradiated with light for more than 16 hours. For such plants, as described in Patent Document 2, a device with a configuration in which partitions are provided radially with respect to the light source and the light source surrounded by the partitions can be turned off to set an arbitrary nighttime period is known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The illuminance of light is inversely proportional to the square of the distance between the light source and the object, and as seedlings grow, the distance to the light source decreases, increasing the illuminance. Therefore, even with a 16-hour day length, physiological disorders can occur due to stress caused by the increase in accumulated light. Conventional technologies such as those described in Patent Documents 1 and 2 above either keep the light source shining or create a predetermined nighttime period regardless of plant growth, and do not take into account the accumulated light amount appropriate for plant growth.

[0006] This disclosure has been made in view of the above-mentioned problems, and aims to provide a plant cultivation device that can prevent physiological disorders in plants caused by an increase in cumulative light while ensuring the necessary daylight hours. [Means for solving the problem]

[0007] The plant cultivation apparatus of this disclosure comprises an installation section on which plants are placed, a light source for illuminating the plants, an electric motor for rotating the installation section, a length measuring sensor capable of measuring the height of the plants, and a control unit that controls the illumination of the light source and the rotational drive of the electric motor. The light source is positioned in the installation section so as to distinguish between the light period and the dark period of the plants by its rotational position. The control unit limits the amount of rotation of the electric motor, which is obtained within a range that does not cause physiological damage to the plants by the cumulative amount of light irradiated onto the plants from the light source during the light period, according to the height of the plants measured by the length measuring sensor. [Effects of the Invention]

[0008] According to this disclosure, a plant cultivation device can be realized that can prevent physiological disorders in plants caused by an increase in accumulated light while ensuring the necessary daylight hours. [Brief explanation of the drawing]

[0009] [Figure 1] This is a plan view showing an example of a plant cultivation apparatus according to this embodiment. [Figure 2] Figure 1 is a plan view showing the plant cultivation device with plants placed inside. [Figure 3] Figure 1 is a side view of the plant cultivation device. [Figure 4] This is a plan view showing the positional relationship between the light source 14 and the plant 21 in the plant cultivation device according to this embodiment. [Figure 5] This is a schematic diagram showing the relationship between the growth stage of a plant and its height. [Figure 6] This is a block diagram showing an example of the functional configuration of a plant cultivation device according to this embodiment. [Figure 7] This is a block diagram showing an example of the hardware configuration of the control unit 60 in the plant cultivation device according to this embodiment. [Figure 8] This flowchart shows the control method for the plant cultivation device according to this embodiment. [Modes for carrying out the invention]

[0010] -Basic configuration of the plant cultivation device in this embodiment- In disclosing this embodiment in detail, the basic configuration of the plant cultivation device in this embodiment will be described.

[0011] The plant cultivation device according to this disclosure comprises an installation section on which plants are placed, a light source for illuminating the plants, an electric motor for rotating the installation section, a length-measuring sensor capable of measuring plant height, and a control unit that controls the illumination of the light source and the rotational drive of the electric motor. The light source is positioned in the installation section so as to distinguish between the light period and the dark period of the plant by its rotational position. The control unit limits the amount of rotation of the electric motor, which is obtained within a range where the cumulative amount of light irradiated to the plant from the light source during the light period does not cause physiological damage to the plant, according to the plant height (plant height) measured by the length-measuring sensor. The cumulative amount of light is the value obtained by multiplying the plant's stay time during the light period by the average value of the light intensity irradiated to the plant during the light period. Specifically, first, the initial amount of rotation of the electric motor (first rotation amount) is determined so that the cumulative amount of light irradiated to the plant from the light source during the light period does not cause physiological damage to the plant. The first rotation amount is the amount of rotation corresponding to the plant height at the initial stage when plant growth begins. This disclosure considers that as plants grow and their height increases, the illuminance increases as they move closer to the light source, causing the accumulated light amount to exceed the range that does not cause physiological damage to the plants. Therefore, the height of the growing plants is measured with a height-measuring sensor, and the first rotation amount is adjusted to the second rotation amount according to the measured value. While the plant cultivation device is operating, the second rotation amount is updated according to the current height of the plants due to their growth. In this way, it becomes possible to set the nighttime hours for plants that take into account the change in height due to plant growth, thereby ensuring the necessary daylight hours while preventing physiological damage to plants due to increased accumulated light amount.

[0012] -Specific Description of Various Embodiments- The embodiments of this disclosure will be described in detail below with reference to the drawings. Note that the following embodiments do not limit the invention as defined in the claims. While several features are described in these embodiments, not all of these features are essential, and the features may be combined in any way. Furthermore, in the drawings, identical or similar components are given the same reference numerals, and redundant descriptions are omitted.

[0013] FIG. 1 is a plan view showing an example of a plant cultivation apparatus according to the present embodiment, and FIG. 2 is a plan view showing a state in which plants are arranged in the plant cultivation apparatus of FIG. 1. FIG. 3 is a side view of the plant cultivation apparatus of FIG. 1. This plant cultivation apparatus includes a housing 11 which is an installation part for plants, a plurality of cultivation beds 12 installed in the housing 11, liquid fertilizer tanks 13 arranged on each cultivation bed 12 inside the housing 11, a light source 14 for illuminating the plants, and a length measuring sensor 15 for measuring the height of the plants.

[0014] The housing 11 is a frame body having a polygonal shape that is rotationally symmetric in plan view, here a hexagonal shape. Although the housing 11 is described as having a polygonal shape, it may have any rotationally symmetric shape, for example, a circular shape. Note that the optimal polygonal shape of the housing 11 is from a quadrilateral to an octagon.

[0015] The cultivation beds 12 are arranged at the side portions of the polygon of the housing 11, and plants 21 are vegetated on the cultivation beds 12 toward the outside of the housing 11. The roots of the plants 21 extend inward of the housing 11 and are accommodated in the liquid fertilizer tanks 13. The liquid fertilizer tanks 13 are filled with a predetermined liquid fertilizer so as not to leak to the outside through a sponge. The housing 11 is supported by a support shaft 16 and is rotatable, for example, in the direction of arrow A.

[0016] The light source 14 is capable of emitting light with a sufficient intensity for photosynthesis for growing the plants 21, and is arranged at a position appropriately separated from the side surface of the housing 11 so as to face the side surface of the housing 11. LEDs can be easily controlled using a phosphor or the like to emit light in a specific wavelength region that promotes plant growth, and are excellent in terms of power consumption and heat generation. Therefore, it is assumed that LEDs are used as the light source 14. As the light source 14, a light source such as a fluorescent lamp may be used according to the characteristics of the plant light source wavelength.

[0017] As shown in FIG. 3, the support shaft 16 is fixed to the housing frame 10. In the housing frame 30, a light source 14 and a length measuring sensor 15 are fixed in the same manner as the support shaft 16. By rotating the housing 11, the length measuring sensor 15 for measuring the height of the plant 21 can measure the plant height of all the plants 21 vegetated on each growth bed 12. The plant height is the height of the above-ground part of the plant (the height from the ground level to the tip of the plant), and hereinafter is simply referred to as the plant height. As the length measuring sensor 15, a non-contact type length measuring sensor applying an infrared laser is optimal, but a length measuring sensor that measures the height of the plant 21 from an image obtained using an image sensor may also be used.

[0018] The housing 11 can be rotated by rotationally driving the support shaft 16 with a motor (not shown). The rotation amount (rotation angular velocity) of the housing 11 can be changed by appropriately adjusting the drive of the motor.

[0019] FIG. 4 is a plan view showing the positional relationship between the light source 14 and the plant 21 in the plant cultivation apparatus according to the present embodiment. The period during which the plant 21 stays in the section near the light source 14 and irradiated with the illumination light of the light source 14 is defined as a photosynthetic light period 41, and the period during which the plant 21 stays in the shadow section generated by the illumination light of the light source 14 irradiating the housing 11 is defined as a dark period 42 during which the plant 21 breathes. In the plant cultivation apparatus of the present embodiment, the light source 14 is arranged so that the light period 41 and the dark period 42 of the plant 21 can be distinguished according to the rotational position of the plant 21 in the housing 11.

[0020] By rotating the housing 11 as appropriate, the plants 21 can be made to alternate between the light period 41 and the dark period 42. At this time, the rotation speed of the housing 11 is set to an angular speed that does not cause physiological disorders (such as chlorosis) resulting from the continuous illumination of the plants 21 by the accumulated light from the light source 14. This makes it possible to maximize the growth of the plants 21 while suppressing the occurrence of physiological disorders. The angular speed of rotation that does not cause physiological disorders varies depending on the plant variety and its growth stage. Therefore, by using parameters to calculate the angular speed of rotation according to the variety of plants 21 installed in the growing bed 12 and their growth stage, it becomes possible to control the rotation speed to the optimal value. In this embodiment, specifically, the above parameters used are a first parameter related to the light intensity of the light source 14 according to the type and variety of plant, and a second parameter indicating the optimal accumulated light intensity for the growth of the plants 21 according to the type and variety of plant. The cumulative light dose of plant 21 is the value obtained by multiplying the time plant 21 spends in the light period 41 by the average value of the light intensity received by plant 21 during the light period 41.

[0021] The first and second parameters can be obtained, for example, as follows: For example, the input data includes individual plant identification information such as the plant variety and growing conditions. The training data consists of historical data (individual plant identification information including the plant variety and growing conditions, cumulative light intensity data for the plant, light intensity data for the light source, and yield data for the plant, etc.). A trained model created by training the model using the input data and training data is used. By inputting individual plant identification information such as the plant variety of plant 21 as input data into the trained model, output data estimated as the first and second parameters is obtained.

[0022] In this embodiment, the light quantity of the light source 14 corresponding to the plant 21 installed in the housing 11 is determined using the first parameter. When the light quantity of the light source 14 is determined, the light quantity per unit time is clearly determined. Using the second parameter, the optimal integrated light quantity corresponding to the plant 21 installed in the housing 11 is obtained. From the light quantity per unit time and the optimal integrated light quantity, the time for which the light source 14 illuminates the plant 21 (the staying time in the section of the light period 41 of the plant 21) is calculated. From this illumination time (staying time), the time required for the housing 11 to make one rotation can be calculated. From this time, the optimal rotation amount of the housing 11, here the rotational angular velocity, can be obtained. Note that an optimal rotational angular velocity (first rotation amount described later) corresponding to the growth state of the plant 21 may be used as a parameter calculated in advance.

[0023] FIG. 5 is a schematic diagram showing the relationship between the growth state of the plant 21 and the height of the plant 21. 51 shows the initial seedling growth state of the plant 21 installed on the growth floor 12. 52 shows the seedling growth state of the plant 21 that has grown from the growth state 51 and, for example, borne fruit.

[0024] Let the average value of the height of the plant 21 in the growth state 51 be T1, and the average value of the height of the plant 21 in the growth state 52 be T2. When the relationship T1 < T2 holds, the leaves of the plant 21 approach the light source 14 due to the change in height due to the growth of the plant 21. The light intensity with which the light source illuminates an object is inversely proportional to the square of the distance between the light source and the object. Therefore, if the rotational angular velocity of the housing 11 is the same in the state 51 and the state 52, the integrated light quantity of the continuous light is approximately (T2 / T1) 2 , , 2 , ,

[0025] Here, (T2 / T1) 2 may be multiplied by a predetermined coefficient a to more accurately represent the integrated light quantity as a*(T2 / T1).

[0025] If the rotational angular velocity of the housing 11 (motor) is the same in growth state 51 and growth state 52, the increased illuminance of the light received by the leaves of the plant 21 from the light source 14 may increase the stress on the leaves of the plant 21, potentially inducing physiological disorders in the leaves. In this embodiment, the initial first rotation amount of the housing 11 is defined as the rotational angular velocity R1, and the current second rotation amount of the housing 1 after the first rotation amount has been adjusted is defined as the rotational angular velocity R2. If the initial height of the plant 21 is T1 and the current height of the plant 21 is T2, then the rotational angular velocity R2 is expressed as follows. R2 = R1 * (T2 / T1) ... (1) Here, we may also multiply R1*(T2 / T1) by a predetermined coefficient b to express the rotational angular velocity R2 more accurately as b*R1*(T2 / T1).

[0026] In the plant cultivation device according to this embodiment, the amount of rotation of the housing 11 relative to the plant 21 is adjusted from the initial rotational angular velocity R1 to the current rotational angular velocity R2 according to the current height of the plant 21. This makes it possible to suppress physiological disorders of the plant 21 caused by stress on the leaves of the plant 21 due to increased illuminance.

[0027] Figure 6 is a block diagram showing an example of the functional configuration of a plant cultivation device according to this embodiment. The plant cultivation device includes a control unit 60 as a control means that serves as an information processing device for this disclosure. The control unit 60 includes a light source control unit 61, a motor control unit 62 which is an electric motor control unit, and a parameter storage ROM 63 which is a storage unit.

[0028] The parameter storage ROM 63 stores various first parameters related to the optimal light intensity according to the variety and growing conditions of the plant 21, and various second parameters related to the optimal cumulative light intensity according to the variety and growing conditions of the plant 11.

[0029] The light source control unit 61 is physically connected to the light source 14 by electrical wiring and controls the light intensity of the light source 14. The light source control unit 61 reads a first parameter related to the corresponding light intensity from the parameter storage ROM 63 and uses the first parameter to determine the optimal light intensity according to the variety and growth conditions of the plant 21.

[0030] The motor control unit 62 is physically connected to the motor 64, which is an electric motor, by electrical wiring and controls the motor 64. The motor control unit 62 reads the corresponding second parameter from the parameter storage ROM 63 and uses the determined light intensity and second parameter to determine the optimal rotational angular velocity of the motor 64 according to the variety of plant 21 and its current growth stage. Specifically, the stay time of the plant 21 during the light period 41 is calculated from the light intensity per unit time and the optimal integrated light intensity, and the time required for the housing 11 to complete one rotation is calculated from this stay time. From this time, the rotational angular velocity R1 of the housing 11 is obtained. This rotational angular velocity R1 is the optimal first rotation amount for the initial plant 21. Using the rotational angular velocity R1 and the initial height T1 and current height T2 of the plant 21 measured by the length measuring sensor 15, the rotational angular velocity R2 is obtained by limiting the rotational angular velocity R1 according to the current height T2 of the plant 21 from equation (1) above. This rotational angular velocity R1 is the optimal second rotation amount for the current plant 21. In this embodiment, the desired nighttime period for the plant 21 can be set by adjusting and controlling the rotation amount of the motor 64 according to the height of the plant 21.

[0031] Figure 7 is a block diagram showing an example of the hardware configuration of the control unit 60 in the plant cultivation device according to this embodiment. The light source control unit 61 and the motor control unit 62 are configured to have the functions of the respective functional units shown in Figure 6, by having the CPU 71 execute a control program stored in the ROM 72 or the like.

[0032] The control unit 60 comprises a CPU 71, ROM 72, RAM 73, secondary storage device 74, input device 75, and display device 76. These components are interconnected via a connection bus 77. The CPU (Central Processing Unit) 11 is responsible for the overall control of the control unit 60. The CPU 71 executes the processing of each flowchart described later by executing the control program stored in the ROM 72, etc. Note that a GPU (Graphics Processing Unit) may be used instead of the CPU, or in conjunction with the CPU.

[0033] ROM 72 is a non-volatile memory that stores control programs and various parameter data. ROM 72 includes the functionality of parameter storage ROM 63. RAM 73 is a volatile memory that temporarily stores images, control programs, and their execution results. Secondary storage device 74 is a rewritable secondary storage device such as a hard disk or flash memory that stores various data used in the flowchart described later. For example, it stores trained models, training datasets, and processing results. This information is output to RAM 73 and used by the CPU 71 to execute the control program. Input devices 75 include keyboards, mice, touch panel devices, etc., and are used to input various user instructions. Display device 76 is a monitor that displays processing results, images, etc.

[0034] In this embodiment, the processing described later is implemented in software using the CPU 71, but some or all of the processing described later may be implemented in hardware. Dedicated circuits (ASICs) or processors (reconfigurable processors, DSPs, etc.) can be used as hardware. The control unit 60 also has a communication unit for communicating with an external device, and may acquire input data, control programs, trained models, etc. from an external device via the communication unit, and may also output processing results etc. to an external device via the communication unit.

[0035] The control unit 60 is configured to have the function of a control unit 60 by having the CPU 71 execute a control program stored in the ROM 72 or the like.

[0036] Figure 8 is a flowchart showing the control method for the plant cultivation device according to this embodiment. For example, as shown in Figure 2, a plant 14 is placed in the housing 11 of the plant cultivation device according to this embodiment. At this time, the plant 14 is, for example, a seedling in its initial growth stage. In step S1, the light source control unit 61 of the control unit 60 reads a first parameter related to the corresponding optimal light intensity from the parameter storage ROM 63, and uses the first parameter to determine the optimal light intensity according to the variety of the plant 21 and the growth stage of the initial seedling.

[0037] In step S2, the motor control unit 62 of the control unit 60 reads the corresponding second parameter from the parameter storage ROM 63. Using the light intensity and the second parameter obtained in step S1, the motor control unit 62 determines the initial first rotation amount, which is the rotational angular velocity R1, of the motor 64 according to the variety of the plant 21 and the initial growth stage of the seedling.

[0038] In step S3, the light source control unit 61 drives and controls the light source 14 to irradiate with the light intensity determined in step S1. In step S4, the motor control unit 62 drives and controls the motor 64 to rotate the housing 11 connected to the motor 64 at the rotational angular velocity R1 determined in step S2.

[0039] In step S5, the motor control unit 62 adjusts the rotation amount of the motor 64 to the second rotation amount, which is the rotational angular velocity R2, based on equation (1) above, according to the current height of the plant 21 measured by the length measuring sensor 15. The rotational angular velocity R2 is updated based on equation (1) until the control unit 60 receives an instruction to stop using the plant growing device in step S6. When the control unit 60 receives an instruction to stop driving the plant growing device in step S6, it stops driving the plant growing device and terminates.

[0040] As described above, the plant cultivation device of this embodiment allows for the setting of a predetermined nighttime period by controlling the rotation amount of the housing 11, thereby maximizing the growth of the plants 21 while suppressing physiological disorders caused by the growth of the plants 21.

[0041] The program that implements the functions of the light intensity control unit 61 and the motor control unit 62 in the information processing device (control unit 60) of the above-described embodiment is included in this disclosure. This disclosure can also be implemented by supplying the program to a system or device via a network or storage medium, and by one or more processors in the computer of that system or device reading and executing the program. It can also be implemented by a circuit (e.g., ASIC) that implements one or more functions.

[0042] While preferred embodiments of the present disclosure have been described above, the disclosure is not limited to these embodiments, and various modifications and changes are possible within the scope of its essence.

[0043] This embodiment includes the following configurations and methods. (Composition 1) The installation area where the plants will be placed, A light source for illuminating the aforementioned plant, A motor for rotating the aforementioned installation part, A length-measuring sensor capable of measuring the height of the aforementioned plant, A control unit that controls the illumination of the light source and the rotational drive of the electric motor, Equipped with, The aforementioned light source is The rotational position of the installation part allows for the distinction between the light period and the dark period of the plant. The control unit, The rotation amount of the electric motor, obtained within a range that does not cause physiological damage to the plant, is limited according to the height of the plant measured by the length measuring sensor, based on the cumulative amount of light irradiated onto the plant from the light source during the light period. Plant growing equipment. (Configuration 2) The control unit, A light source control unit that determines the amount of light from the light source according to the plant, A motor control unit that adjusts the rotation amount of the motor, Having, The plant cultivation device described in Configuration 1. (Composition 3) The motor control unit is, The integrated light amount corresponding to the plant is acquired, and the motor control unit uses the light amount of the light source acquired and the integrated light amount to determine the first rotation amount of the motor such that the integrated light amount does not cause physiological damage to the plant. The first rotation amount is adjusted to the second rotation amount according to the current height of the plant. The plant cultivation device described in Configuration 2. (Composition 4) The motor control unit is, Based on the information of the accumulated light amount, the first rotation amount of the electric motor is determined from the time the plant stays in the light period. The plant cultivation device described in Configuration 3. (Composition 5) The aforementioned integrated light quantity is This is the value obtained by multiplying the duration of the plant's stay during the light period by the average value of the light intensity irradiated to the plant during that period. A plant cultivation device described in one of configurations 1 to 4. (Composition 6) It has a storage unit in which information on the cumulative light amount corresponding to the plant is stored in advance. A plant cultivation device described in one of configurations 1 to 5. (Composition 7) The system has a storage unit that pre-stores information on the amount of light corresponding to the plant and information on the total amount of light corresponding to the plant. A plant cultivation device as described in one of configurations 2 to 4. (Composition 8) The control unit, When the initial rotational speed of the electric motor is R1, the initial height of the plant is T1, the current rotational speed of the electric motor is R2, and the current height of the plant is T2, R2, R2 = R1 * (T2 / T1) 2 Obtained by, A plant cultivation device described in any one of configurations 1 to 7. (Composition 9) An information processing device for controlling a plant cultivation device, wherein a light source for illuminating a plant is arranged such that the light period and dark period of the plant are distinguished by the rotational position of the plant, while the installation section on which the plant is installed is rotated by an electric motor, The rotation amount of the electric motor, obtained within a range that does not cause physiological damage to the plant, is limited according to the height of the plant, based on the cumulative amount of light irradiated onto the plant from the light source during the aforementioned light period. Information processing device. (Composition 10) A computer for a plant cultivation device is provided, in which a light source is positioned to illuminate the plant, so as to distinguish between the light period and the dark period of the plant based on the rotational position of the plant, while the installation section on which the plant is installed is rotated by an electric motor. Control means for limiting the rotation amount of the electric motor, which is obtained within a range that does not cause physiological damage to the plant, according to the height of the plant, based on the cumulative amount of light irradiated onto the plant from the light source during the light period. A program designed to function as such. (Method 1) A method for controlling a plant cultivation apparatus, wherein a light source is positioned to illuminate a plant, and the installation section on which the plant is installed is rotated by an electric motor, so that the light period and dark period of the plant can be distinguished by the rotational position of the plant, The rotation amount of the electric motor, obtained within a range that does not cause physiological damage to the plant, is limited according to the height of the plant, based on the cumulative amount of light irradiated onto the plant from the light source during the aforementioned light period. A method for controlling a plant cultivation device. [Explanation of Symbols]

[0044] 11 cabinets 12 Growing bed 13 Liquid fertilizer tank 14 Light source 15. Measuring sensor 21 Plants 60 Control unit 60 61 Light source control unit 62 Motor control unit 62 63 Parameter Storage ROM

Claims

1. The installation area where the plants will be placed, A light source for illuminating the aforementioned plant, A motor for rotating the aforementioned installation part, A length-measuring sensor capable of measuring the height of the aforementioned plant, A control unit that controls the illumination of the light source and the rotational drive of the electric motor, Equipped with, The aforementioned light source is The rotational position of the installation part allows for the distinction between the light period and the dark period of the plant. The control unit, The rotation amount of the electric motor, obtained within a range that does not cause physiological damage to the plant, is limited according to the height of the plant measured by the length measuring sensor, based on the cumulative amount of light irradiated onto the plant from the light source during the light period. Plant growing equipment.

2. The control unit, A light source control unit that determines the amount of light from the light source according to the plant, A motor control unit that adjusts the rotation amount of the motor, Having, The plant cultivation apparatus according to claim 1.

3. The motor control unit is, The integrated light amount corresponding to the plant is acquired, and the motor control unit uses the light amount of the light source acquired and the integrated light amount to determine the first rotation amount of the motor such that the integrated light amount does not cause physiological damage to the plant. The first rotation amount is adjusted to the second rotation amount according to the current height of the plant. The plant cultivation apparatus according to claim 2.

4. The motor control unit is, Based on the information of the accumulated light amount, the first rotation amount of the electric motor is determined from the time the plant stays in the light period. The plant cultivation apparatus according to claim 3.

5. The aforementioned integrated light quantity is This is the value obtained by multiplying the duration of the plant's stay during the light period by the average value of the light intensity irradiated to the plant during that period. The plant cultivation apparatus according to claim 1.

6. It has a storage unit in which information on the cumulative light amount corresponding to the plant is stored in advance. The plant cultivation apparatus according to claim 1.

7. The system has a storage unit that pre-stores information on the amount of light corresponding to the plant and information on the total amount of light corresponding to the plant. The plant cultivation apparatus according to claim 2.

8. The control unit, When the initial rotational speed of the electric motor is R1, the initial height of the plant is T1, the current rotational speed of the electric motor is R2, and the current height of the plant is T2, R2, R2=R1*(T2 / T1) 2 Obtained by, The plant cultivation apparatus according to claim 1.

9. An information processing device for controlling a plant cultivation device, wherein a light source for illuminating a plant is arranged such that the light period and dark period of the plant are distinguished by the rotational position of the plant, while the installation section on which the plant is installed is rotated by an electric motor, The rotation amount of the electric motor, obtained within a range that does not cause physiological damage to the plant, is limited according to the height of the plant, based on the cumulative amount of light irradiated onto the plant from the light source during the aforementioned light period. Information processing device.

10. A method for controlling a plant cultivation apparatus, wherein a light source is positioned to illuminate a plant, and the installation section on which the plant is installed is rotated by an electric motor, so that the light period and dark period of the plant can be distinguished by the rotational position of the plant, The rotation amount of the electric motor, obtained within a range that does not cause physiological damage to the plant, is limited according to the height of the plant, based on the cumulative amount of light irradiated onto the plant from the light source during the aforementioned light period. A method for controlling a plant cultivation device.

11. A computer for a plant cultivation device, in which a light source is positioned to illuminate the plant, is used to rotate the installation section on which the plant is placed using an electric motor, so as to distinguish between the light period and the dark period of the plant based on the rotational position of the plant. Control means for limiting the rotation amount of the electric motor, which is obtained within a range that does not cause physiological damage to the plant, according to the height of the plant, based on the cumulative amount of light irradiated onto the plant from the light source during the light period. A program designed to function as such.

Images