Plant condition detection system and gas detection device

Abstract

To accurately detect the state of a plant.SOLUTION: A plant state detection system 1 includes a gas detector 2 including a gas detection unit 21 configured to detect a gas emitted from a plant G, and a server 3 configured to acquire gas information detected by the gas detection unit 21 and detect a state of the plant G based on the gas information. The gas detection unit 21 detects one or both of leaf alcohol and leaf aldehyde as the gas, so that it can accurately detect the state of the plant G and also can detect temperature stress of the plant G.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a vegetative state detection system and a gas detection device.

Background Art

[0002] Conventionally, as a device for detecting a vegetative state, for example, as described in Japanese Patent Application Laid-Open No. 2020-64466, there is known a device that captures an image of a crop and analyzes the captured image to grasp the growth state of the crop or the damage situation of pests.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the device described in Patent Document 1, it is difficult to accurately detect the vegetative state. That is, the device described in Patent Document 1 that captures an image of a plant and detects the vegetative state can only detect the state of the plants within the captured range, and if diseases or pest damage occur in the un-captured range, there is a risk of being undetected.

[0005] The present disclosure provides a vegetative state detection system and a gas detection device capable of accurately detecting the vegetative state.

Means for Solving the Problems

[0006] In other words, a plant condition detection system relating to one aspect of this disclosure comprises a gas detection device having a gas detection unit that detects gases emitted from a plant, and a plant condition detection device that acquires gas information detected by the gas detection unit and detects the state of the plant based on the gas information, wherein the gas detection unit detects either or both of green leaf alcohol and green leaf aldehyde as gases. This plant condition detection system can detect gases emitted from a plant and detect the state of the plant based on that gas information. Therefore, the plant condition detection system can detect the state of the plant with high accuracy. Furthermore, by detecting either or both of green leaf alcohol and green leaf aldehyde as gases, this plant condition detection system can detect temperature stress in the plant.

[0007] Furthermore, in a plant condition detection system relating to one aspect of this disclosure, the gas detection unit may detect either or both ethylene and carbon dioxide as gases. In this case, by detecting either or both ethylene and carbon dioxide as gases, the plant condition detection system can detect the normal growth rate of the plant.

[0008] Furthermore, in a plant condition detection system relating to one aspect of this disclosure, the gas detection unit may have a semiconductor gas sensor using a metal oxide as a sensor for detecting green leaf alcohol or green leaf aldehyde. In this case, by using a semiconductor gas sensor using a metal oxide as a sensor for detecting green leaf alcohol or green leaf aldehyde, the plant condition detection system can reduce the cost of installing gas sensors and enable the detection of various gases.

[0009] Furthermore, a plant condition detection system relating to one aspect of this disclosure may include a container housing a gas detection unit and a suction device that draws air from around the plant into the container. In this case, the gas detection unit is housed in the container, and air from around the plant is drawn into the container, thereby drawing gases emitted from the plant into the container. As a result, gas diffusion is suppressed, and the plant condition detection system can improve the accuracy of gas detection.

[0010] Furthermore, in a plant condition detection system relating to one aspect of this disclosure, multiple gas detection devices may be provided in a cultivation area where multiple plants are grown, and they may be installed at equal intervals. In this case, by arranging multiple gas detection devices at equal intervals in the cultivation area, the plant condition detection system can accurately recognize the condition of plants at each location within the cultivation area.

[0011] Furthermore, a plant condition detection system relating to one aspect of this disclosure may include a display control unit that displays the plant condition in accordance with the arrangement positions of multiple gas detection devices. In this case, by displaying the plant condition in accordance with the arrangement positions of multiple gas detection devices, the plant condition detection system allows for easy visual understanding of the plant condition within the cultivation area.

[0012] A gas detection device relating to one aspect of this disclosure comprises a gas detection unit that detects gases emitted from plants, and an output unit that outputs gas information of the gas detected by the gas detection unit as information for detecting the state of the plant. The gas detection unit detects either or both of green leaf alcohol and green leaf aldehyde as gases. This gas detection device detects gases emitted from plants and outputs that gas information as information for detecting the state of the plant. This makes it possible to detect the state of the plant based on the gas information of the plant, and the gas detection device can detect the state of the plant with high accuracy. Furthermore, by detecting either or both of green leaf alcohol and green leaf aldehyde as gases, this gas detection device can detect temperature stress in plants.

[0013] Furthermore, in a gas detection device relating to one aspect of this disclosure, the gas detection unit may detect either or both of ethylene and carbon dioxide as gases. In this case, by detecting either or both of ethylene and carbon dioxide as gases, the gas detection device can detect the normal growth rate of plants.

[0014] Furthermore, in a gas detection device relating to one aspect of this disclosure, the gas detection unit may have a semiconductor gas sensor using a metal oxide as a sensor for detecting green leaf alcohol or green leaf aldehyde. In this case, by using a semiconductor gas sensor using a metal oxide as a sensor for detecting green leaf alcohol or green leaf aldehyde, the gas detection device can reduce the cost of installing the gas sensor and enable the detection of various types of gases.

[0015] Furthermore, a gas detection device relating to one aspect of this disclosure may include a container for housing a gas detection unit and a suction device for drawing air from around the plant into the container. In this case, by housing the gas detection unit in the container and drawing air from around the plant into the container, the gas detection device can draw gas emitted from the plant into the container. As a result, gas diffusion is suppressed, and the gas detection device can improve the accuracy of gas detection.

[0016] Furthermore, in a gas detection device relating to one aspect of this disclosure, the gas detection units may be provided in multiple locations within a cultivation area where multiple plants are grown, and may be installed at equal intervals. In this case, by arranging multiple gas detection units at equal intervals within the cultivation area, the gas detection device can accurately recognize the condition of plants at each location within the cultivation area. [Effects of the Invention]

[0017] According to this disclosure, the plant condition can be detected with high accuracy. [Brief explanation of the drawing]

[0018] [Figure 1] This figure shows an overview of the electrical configuration of the plant condition detection system and gas detection device according to the embodiments of this disclosure. [Figure 2] Figure 1 shows the general configuration and installation method of the gas detection device. [Figure 3] This figure shows an example of how the gas detection device in Figure 1 is installed. [Figure 4]It is a diagram showing the display mode of the state of the plant in the plant state detection system of FIG. 1. [Figure 5] It is a flowchart showing the control process of the gas detection device of FIG. 1. [Figure 6] It is a flowchart showing the control process of the server of the plant state detection system of FIG. 1.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0020] FIG. 1 is a diagram showing an outline of the electrical configuration of a plant state detection system and a gas detection device according to an embodiment of the present disclosure. FIGS. 2 and 3 are explanatory diagrams of the configuration mode and installation mode of the gas detection device.

[0021] As shown in FIG. 1, the plant state detection system 1 is a system that detects the state of the plant G by detecting the gas emitted from the plant G. The plant state detection system 1 includes a gas detection device 2 and a server 3.

[0022] The gas detection device 2 is a device that detects the gas emitted from the plant G, and is arranged, for example, near the plant G. The plant G is a plant to be the object of state detection, and is, for example, a cultivated plant. The gas detection device 2 is configured to be able to transmit data information such as gas information to the server 3. For example, the gas detection device 2 and the server 3 are configured to be able to communicate via the Internet N. The gas detection device 2 includes a gas detection unit 21, an environment detection unit 22, a communication unit 23, a suction machine 24, and a battery 25.

[0023] The gas detection unit 21 and the environmental detection unit 22 are provided as part of the sensor unit 20 and are arranged, for example, within the same housing. The gas detection unit 21 is a gas sensor that detects gases emitted from the plant G. The gases emitted from the plant G include not only gases emitted directly from the plant G, but also gases emitted from substances attached to the plant G or attached to the vicinity of the plant G.

[0024] The detected gases include, for example, one or both of the following: green leaf alcohol (hexenol, cis-3-hexen-1-ol) and green leaf aldehyde (hexenal, trans-2-hexenal). Green leaf alcohol and green leaf aldehyde are green fragrance substances and volatile substances with a six-carbon skeleton. By detecting green leaf alcohol or green leaf aldehyde as a gas in the gas detection unit 21, it becomes possible to detect the degree of temperature stress in plant G. For example, the plant condition detection system 1 can detect that the higher the detection level (e.g., gas concentration) of green leaf alcohol or green leaf aldehyde, the greater the temperature stress in plant G.

[0025] Furthermore, the detected gas may be either ethylene or carbon dioxide, or both. By detecting ethylene or carbon dioxide as a gas, the gas detection unit 21 can detect the normal growth status of plant G. For example, the plant condition detection system 1 can detect that plant G is growing normally if the detection level of ethylene or carbon dioxide (e.g., gas concentration) is high.

[0026] The gas detection unit 21 detects at least one of the following: leaf alcohol, leaf aldehyde, ethylene, and carbon dioxide. The gas detection unit 21 may also detect some or all of these gases. Furthermore, the gas detection unit 21 may detect gases other than leaf alcohol, leaf aldehyde, ethylene, and carbon dioxide that enable the detection of the plant's condition.

[0027] The gas detection unit 21 has, for example, a semiconductor gas sensor using a metal oxide as a sensor for detecting green leaf alcohol or green leaf aldehyde. This allows the gas detection device 2 to reduce the cost of the gas detection unit 21 and enable the detection of various gases. The gas detection unit 21 can use known sensors as sensors for detecting ethylene and carbon dioxide. If multiple different gases are detected by the gas detection unit 21, multiple sensors may be used as the gas detection unit 21. In addition, sensors other than those mentioned above may be used as the gas detection unit 21, as long as they are capable of detecting gases.

[0028] The environmental detection unit 22 is a sensor for detecting the growing environment of plant G. The environmental detection unit 22 detects at least one of the environmental values ​​of temperature, humidity, carbon dioxide concentration, and illuminance around plant G. The environmental detection unit 22 may detect some or all of the environmental values ​​of temperature, humidity, carbon dioxide concentration, and illuminance around plant G. For example, a thermometer, hygrometer, carbon dioxide concentration meter, or illuminance meter can be used as the environmental detection unit 22. This environmental detection unit 22 may also be used as a carbon dioxide detection sensor. Furthermore, the environmental detection unit 22 may detect environmental values ​​other than temperature, humidity, carbon dioxide concentration, and illuminance around plant G.

[0029] The sensor unit 20 may include an airflow sensor. The airflow sensor is a sensor that detects the airflow around the sensor unit 20. The gas detection device 2 can detect whether the air around the plant G is being drawn towards the sensor unit 20 by detecting the airflow around the sensor unit 20 using the airflow sensor. In some cases, the installation of the environmental detection unit 22 in the sensor unit 20 may be omitted.

[0030] The communication unit 23 functions as an output unit that outputs gas information detected by the gas detection unit 21 as information for detecting the state of the plant G. For example, the communication unit 23 outputs the gas information detected by the gas detection unit 21 to an external device. In this case, the communication unit 23 outputs the gas information to the external device repeatedly at a predetermined interval. This makes it possible for the gas detection device 2 to provide the state of the plant G in real time. The gas information includes, for example, the gas detection level. If the gas detection unit 21 has multiple sensors, multiple pieces of gas information corresponding to each sensor are output. In addition to gas information, the communication unit 23 may also output environmental value information detected by the environmental detection unit 22 as information for detecting the state of the plant G. This communication unit 23 is, for example, a communication device for communicating with a server 3 and is configured to communicate with the server 3 via the internet N. This communication unit 23 may be, for example, a router for connecting the sensor unit 20 to the internet N, or a wireless LAN router that relays the connection to the router.

[0031] The suction device 24 is a device for drawing air from around the plant G to the sensor unit 20. For example, a pump or fan, or any other device capable of drawing in air, can be used as the suction device 24. The battery 25 is a power storage device for supplying power to equipment in the gas detection device 2 that requires power. By equipping the gas detection device 2 with the battery 25, it is not necessary to connect a power cable to the gas detection device 2 to draw in external power, making the installation and handling of the gas detection device 2 easier. However, in some cases, the installation of the battery 25 in the gas detection device 2 may be omitted, and the device may be operated using an external power source.

[0032] As shown in Figure 2, the gas detection device 2 is installed at the location of the plant G. For example, the gas detection device 2 is installed on the soil where the plant G is planted. In this case, the gas detection device 2 may be installed between the ground and the device via a spacer or other component. Also, as shown in Figure 3, when the gas detection device 2 is installed inside a facility 11 such as a greenhouse, the gas detection device 2 may be installed by suspending it from above. Figure 3 is a diagram showing an example of the installation configuration of the gas detection device shown in Figure 1.

[0033] Furthermore, as shown in Figure 4, multiple gas detection devices 2 may be installed in the cultivation area R where multiple plants G are cultivated. Figure 4 is a diagram showing the installation configuration of the gas detection devices 2 and the display configuration of the plant status, and is a top view of the cultivation area R. In this case, the multiple gas detection devices 2 are arranged at equal intervals. For example, gas detection devices 2 are installed at the same interval L from adjacent gas detection devices 2 in the cultivation area R. By arranging the gas detection devices 2 in this way, the server 3 can accurately recognize the status of the plants G at each location within the cultivation area R. Figure 4 shows the case where the gas detection devices 2 are arranged at equal intervals in the vertical direction in the cultivation area R, but the gas detection devices 2 may also be arranged at equal intervals in the horizontal or diagonal direction. Here, equal intervals include approximately equal intervals. The cultivation area R represents a cultivation lot of plants G, and multiple plants G are cultivated in the cultivation area R.

[0034] In Figure 2, the gas detection device 2 has a container 26. The container 26 is a component for housing the gas detection unit 21, and for example, a box-shaped container that covers the gas detection unit 21 is used. The container 26 may be a rectangular parallelepiped as shown in Figure 2, or it may be a shape other than a rectangular parallelepiped as long as it can enclose the gas detection unit 21. For example, the container 26 may be small enough to be held and handled. In Figure 2, the sensor unit 20 is housed inside the container 26, and the gas detection unit 21 and the environmental detection unit 22 are housed inside the container 26, but the environmental detection unit 22 may be placed outside the container 26. Also, although the communication unit 23 is not shown in Figure 2, the communication unit 23 may be installed inside the container 26 or outside the container 26.

[0035] The container 26 has a suction port 26a and an outlet port 26b. The suction port 26a and the outlet port 26b are openings that penetrate the inside and outside of the container 26. The suction port 26a is an opening for drawing air from around the plant G into the container 26. The suction port 26a is formed, for example, at the top of the container 26. The outlet port 26b is an opening for discharging air from inside the container 26 to the outside of the container 26. The outlet port 26b is formed, for example, at the bottom of the container 26.

[0036] The container 26 is equipped with a suction device 24. The suction device 24 draws air from around the plant G into the container 26. The suction device 24 is installed, for example, at the position of the outlet 26b, and by driving it, it discharges air from inside the container 26 through the outlet 26b, thereby drawing air from around the plant G into the container 26 through the suction port 26a. Alternatively, the suction device 24 may be installed at the position of the suction port 26a, and air may be drawn in from the suction port 26a by driving the suction device 24.

[0037] By providing a container 26 to house the gas detection unit 21 and drawing in air from around the plant G into the container 26 to detect the gas, the gas detection device 2 can improve its gas detection accuracy. In other words, by drawing in air from around the plant G into the container 26, the gas detection device 2 suppresses the diffusion of gas from the plant G and can maintain a high gas concentration. As a result, the gas detection device 2 can improve the accuracy of gas detection from the plant G.

[0038] In Figure 1, Server 3 is a plant state detection device that acquires gas information detected by the gas detection unit 21 and detects the state of plant G based on that gas information. In addition to gas information, Server 3 may also acquire environmental value information and detect and predict the state of plant G based on the gas information and environmental value information. Server 3 is composed of a computer including, for example, a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory), and records the gas information and environmental value information transmitted from the gas detection device 2, and detects and predicts the state of plant G based on this information. This Server 3 functions, for example, as the main device for cloud computing in the plant state detection system 1. In other words, Server 3 provides the plant state information, which is the state of plant G, to terminal devices 4. For example, Server 3 enables cloud services by providing plant state information to terminal devices 4 that access Server 3.

[0039] Server 3 includes a plant state detection unit 31, a display control unit 32, a recording unit 33, and a communication unit 34. The plant state detection unit 31 detects and predicts the state of plant G based on gas information and environmental value information. For example, the plant state detection unit 31 acquires the gas detection level of plant G as gas information. The detection level corresponds to the gas concentration. Then, the plant state detection unit 31 determines the state of plant G based on the gas detection level. For example, the plant state detection unit 31 is configured with relational data such as a table relating the gas detection level to the state of plant G and a judgment threshold. By using this relational data, the plant state detection unit 31 can determine the state of plant G from the gas detection level.

[0040] Specifically, when the gas is green leaf alcohol or green leaf aldehyde, the plant state detection unit 31 detects the degree of temperature stress on plant G. That is, the plant state detection unit 31 determines whether plant G is in a normal state, a caution state, or a warning state based on the detection level of green leaf alcohol or green leaf aldehyde. A normal state is when the detection level is low and plant G is not experiencing temperature stress; a caution state is when the detection level exceeds the caution level and attention is needed regarding the temperature stress on plant G; and a warning state is when the detection level exceeds the warning level and countermeasures are needed against the temperature stress on plant G. In this case, the plant state detection unit 31 determines the state of plant G in three stages, but it may also determine it in two or four or more stages.

[0041] Furthermore, if the gas is ethylene or carbon dioxide, the plant state detection unit 31 detects the normal growth of plant G. That is, the plant state detection unit 31 determines whether plant G is in a normal state, a caution state, or a warning state based on the detection level of ethylene or carbon dioxide. A normal state is when the detection level is high and plant G is growing normally; a caution state is when the detection level exceeds the caution level and plant G is not growing very normally; and a warning state is when the detection level exceeds the warning level and plant G is not growing normally and growth countermeasures are needed. In this case, the plant state detection unit 31 determines the state of plant G in three stages, but it may also determine it in two or four or more stages.

[0042] Furthermore, the plant state detection unit 31 acquires environmental values ​​such as temperature, humidity, carbon dioxide concentration, and illuminance around the plant G as environmental value information. The plant state detection unit 31 then determines the state of the plant G based on these environmental values. For example, the plant state detection unit 31 is configured with relational data such as a table relating environmental values ​​to the state of the plant G and a determination threshold. By using this relational data, the plant state detection unit 31 can determine the state of the plant G from the environmental values. In other words, the plant state detection unit 31 can predict the normal growth rate of the plant G based on the temperature, humidity, carbon dioxide concentration, and illuminance around the plant G. In addition, by combining gas information and environmental value information, the plant state detection unit 31 can detect and predict the growth state of the plant G with greater accuracy.

[0043] The display control unit 32 displays the state of plant G based on the gas detection level in the gas detection device 2. For example, the display control unit 32 generates display data that associates the state of plant G with the state of gas detection device 2 based on the state of plant G detected by the plant state detection unit 31. The display control unit 32 then displays the state of gas detection device 2 and plant G in association with each other, making it viewable by terminal equipment 4 or the like.

[0044] Specifically, as shown in Figure 4, when multiple gas detection units 21 are installed in the cultivation area R, the display control unit 32 displays the status of the plants G in accordance with the placement of the gas detection devices 2. The display mode is different depending on the status of the plants G; for example, the better the status of the plants G, the lighter the display mode. In other words, the worse the status of the plants G, the darker the display mode. By using different display modes according to the status of the plants G, the display control unit 32 makes it easy to grasp the status of the plants G within the cultivation area R through visual means. Furthermore, when cultivating plants G in a large-scale cultivation facility, when cultivating plants G in a wide cultivation area R, or when cultivating plants G in multiple cultivation areas R, the plants G can be managed efficiently.

[0045] The display method for the state of plant G may vary depending on the state of plant G. For example, if plant G is in good condition, an inconspicuous color may be used. For example, if plant G is in good condition, it may be green; if plant G is not in very good condition, it may be yellow; and if plant G is in poor condition, it may be red. The display control unit 32 may also display the state of plant G using different marks depending on the state of plant G, or it may display the state of plant G in text. The display control unit 32 may also display the state of plant G in a table format by assigning numbers to the gas detection unit 21.

[0046] The recording unit 33 records gas information and information about the state of plant G. In this case, it records gas information that is repeatedly transmitted from the gas detection device 2 at a predetermined interval, and records the state of plant G based on the gas information.

[0047] The communication unit 34 has the function of communicating with the gas detection device 2. For example, the communication unit 34 is capable of communicating with the gas detection device 2 via the internet N and receives gas information transmitted from the gas detection device 2. The communication unit 34 also provides information on the state of the plant G detected based on the gas information to the terminal device 4. For example, by accessing the server 3 using the terminal device 4, it becomes possible to check or recognize the state of the plant G through the terminal device 4 even without being at the location of the plant G. The terminal device 4 is, for example, a smartphone 4a or a personal computer 4b. Alternatively, the terminal device 4 may be other terminal devices such as a tablet.

[0048] Next, the method of use and operation of the plant condition detection system 1 and gas detection device 2 according to this embodiment will be described.

[0049] Figure 5 is a flowchart showing the operation of the gas detection device 2. Figure 6 is a flowchart showing the operation of the server 3 in the plant condition detection system 1.

[0050] First, as shown in Figures 2 and 3, the gas detection device 2 is installed in the location where the plant G is located. The gas detection device 2 is positioned near the plant G. In this case, the gas detection device 2 may be installed on the ground or suspended from above. Also, as shown in Figure 4, multiple gas detection devices 2 may be installed in the cultivation area R of the plant G. In this case, the gas detection units 21 of the gas detection device 2 are arranged at equal intervals. This allows for accurate recognition of the state of the plant G at each location within the cultivation area R. The position of the gas detection device 2 within the cultivation area R is registered and displayed. For example, the position of the gas detection device 2 in the cultivation area R is set and registered to match the position within the display range.

[0051] Then, as shown in Figure 5, the gas detection process of the gas detection device 2 is executed. This series of control processes shown in Figure 5 is repeatedly executed by the gas detection device 2 at a predetermined cycle.

[0052] First, as shown in step S10 of Figure 5 (hereinafter simply referred to as S10; the same applies to subsequent steps), gas detection is performed. Gas detection is the process of detecting gases emitted from plant G. For example, the gas detection unit 21 detects gases emitted from plant G. This gas detection is detected as a gas concentration by the gas detection unit 21, and the gas detection device 2 processes and records it as gas information. If the gas detection unit 21 is equipped with multiple sensors to detect multiple gases, the gas information for each gas is recorded.

[0053] Furthermore, in S10, in addition to gas detection, environmental value detection may also be performed. Environmental value detection is a process that detects the growing environment of plant G. For example, the environmental detection unit 22 detects at least one of the environmental values ​​of temperature, humidity, carbon dioxide concentration, and illuminance around plant G. The detected environmental value is processed as environmental value information by the gas detection device 2 and recorded.

[0054] Furthermore, in S10, when gas detection is performed, the suction device 24 is activated. That is, as shown in Figure 2, the suction device 24 is activated, and the air surrounding the plant G is drawn into the container 26. This allows for accurate gas detection. In other words, by housing the gas detection unit 21 in the container 26 and drawing the air surrounding the plant G into the container 26, the diffusion of gas around the plant G is suppressed. Therefore, gas detection can be performed without the gas concentration becoming too low, and the detection accuracy is improved. In addition, by drawing the air surrounding the plant G into the container 26, the gas can be reliably drawn in and detected even if air is flowing around the plant G in the opposite direction to the gas detection device 2.

[0055] Then, the process moves to S12 in Figure 5, where gas information is output. The output of gas information is the process of sending the gas information of the gas detected by the gas detection unit 21 to the server 3. For example, the communication unit 23 sends the gas information of the gas detected by the gas detection unit 21 to the server 3 via the internet N. At this time, if the environmental value of plant G is detected, the environmental value information is sent to the server 3 along with the gas information. After the process in S12 is completed, the series of control processes in Figure 5 is terminated.

[0056] Meanwhile, on server 3, the plant state detection process is executed as shown in Figure 6. This plant state detection process is repeatedly executed by server 3 at predetermined intervals.

[0057] First, as shown in S20 of Figure 6, gas information is acquired. This acquisition of gas information is the process of acquiring gas information transmitted from the gas detection device 2. For example, the communication unit 34 receives gas information transmitted from the gas detection device 2. The received gas information is then recorded in the recording unit 33. If environmental value information is received along with the gas information, that environmental value information is also recorded in the recording unit 33.

[0058] Then, the process moves to S22, where plant state detection is performed. Plant state detection is a process that detects the state of plant G based on gas information. If environmental value information is also acquired in addition to gas information, the state of plant G may be detected based on both gas information and environmental value information. For example, the plant state detection unit 31 detects the state of plant G based on the gas information of plant G. That is, the plant state detection unit 31 detects the state of plant G based on the gas detection level.

[0059] Specifically, the plant condition detection unit 31 can detect the degree of temperature stress in plant G if the detected gas is leaf alcohol or leaf aldehyde. The plant condition detection unit 31 can detect that the higher the gas detection level, the greater the temperature stress in plant G. Furthermore, the plant condition detection unit 31 can detect the degree of normal growth in plant G if the detected gas is ethylene or carbon dioxide. The plant condition detection unit 31 can detect that the higher the gas detection level, the greater the degree of normal growth in plant G.

[0060] Then, the process moves to S24, where the plant status is displayed. Based on the state of plant G detected in S22, display data is generated that associates the gas detection device 2 with the state of plant G, and the state of plant G is displayed in association with the gas detection device 2. For example, as shown in Figure 4, when multiple gas detection devices 2 are placed in the cultivation area R, the state of plant G is displayed corresponding to the placement of the gas detection devices 2. Figure 4 schematically shows the cultivation area R, and the quality of the plant G's state is indicated by different shades of gray corresponding to the gas detection device 2. In other words, the better the state of plant G, the lighter the display, and the worse the state of plant G, the darker the display. For example, the lower the temperature stress level of plant G, the lighter the display, and the higher the temperature stress level of plant G, the darker the display. Also, the greater the normal growth rate of plant G, the lighter the display, and the less normal growth rate of plant G, the darker the display. In Figure 4, it can be seen that the state of plant G in the upper left of the four cultivation areas R is poor. By displaying different information depending on the state of the plant G, the plant state detection system 1 allows users to easily grasp the state of the plant G within the cultivation area R through visual means. Furthermore, the plant state detection system 1 can efficiently manage the plant G when cultivating it in a large-scale cultivation facility, in a wide cultivation area R, or in multiple cultivation areas R.

[0061] Furthermore, the way in which the condition of plant G is indicated may vary depending on the condition of plant G. For example, if plant G is in good condition, an inconspicuous color may be used. For instance, if plant G is in good condition, it may be green; if plant G is not in very good condition, it may be yellow; and if plant G is in poor condition, it may be red.

[0062] The status of plant G, as shown in Figure 4, is displayed on terminal device 4 by accessing server 3 via terminal device 4. This allows users to check the status of plant G using terminal device 4. Therefore, even users in remote locations can check the status of plant G in real time. After completing the process in S24, the series of control processes shown in Figure 6 are terminated.

[0063] As described above, the plant state detection system 1 and gas detection device 2 according to this embodiment detect gases emitted from the plant G and output the gas information as information for detecting the state of the plant G. As a result, the plant state detection system 1 and gas detection device 2 can detect the state of the plant G based on the gas information of the plant G, and can detect the state of the plant G with high accuracy.

[0064] For example, if a plant G is imaged and its condition is detected based on this image, it is difficult to detect the condition of parts of the plant G that are not imaged. Also, if the condition of a plant is detected by an infrared sensor, it is difficult to detect the condition of parts of the plant G that are not within the sensor's detection range. In contrast, the plant condition detection system 1 and gas detection device 2 according to this embodiment detect the condition of the plant G based on the gas information of the plant G, so it is possible to detect the condition of parts of the plant G that are far from the gas detection unit 21 or in shaded areas. Therefore, the plant condition detection system 1 and gas detection device 2 according to this embodiment can detect the condition of the plant G with high accuracy.

[0065] Furthermore, according to the plant state detection system 1 and gas detection device 2 of this embodiment, the state of plant G can be detected based on environmental values ​​in addition to the gas information of plant G. Therefore, the plant state detection system 1 and gas detection device 2 can detect and predict the state of the plant with greater accuracy based on the gas information and environmental value information.

[0066] Furthermore, according to the plant condition detection system 1 and gas detection device 2 of this embodiment, either or both of green leaf alcohol or green leaf aldehyde are detected as gas. As a result, the plant condition detection system 1 and gas detection device 2 can accurately detect the degree of temperature stress of plant G.

[0067] Furthermore, according to the plant condition detection system 1 and gas detection device 2 of this embodiment, ethylene or carbon dioxide, or both, can be detected as gas. As a result, the plant condition detection system 1 and gas detection device 2 can accurately detect the normal growth stage of plant G.

[0068] Furthermore, according to the plant condition detection system 1 and gas detection device 2 of this embodiment, a semiconductor gas sensor using a metal oxide is used as the sensor for detecting green leaf alcohol or green leaf aldehyde. As a result, the plant condition detection system 1 and gas detection device 2 can reduce the cost of the gas sensor and detect a variety of gases.

[0069] Furthermore, according to the plant condition detection system 1 and gas detection device 2 of this embodiment, the gas detection unit 21 is housed in a container 26, and air from around the plant G is drawn into the container 26, drawing in the gas emitted from the plant G into the container 26. As a result, the plant condition detection system 1 and gas detection device 2 can suppress the diffusion of gas and improve the accuracy of gas detection.

[0070] Furthermore, according to the plant condition detection system 1 and gas detection device 2 of this embodiment, multiple gas detection units 21 are provided in the cultivation area R where multiple plants G are cultivated, and are installed at equal intervals. Therefore, the plant condition detection system 1 and gas detection device 2 can accurately recognize the condition of the plants G at each location within the cultivation area R.

[0071] Furthermore, the plant condition detection system 1 according to this embodiment includes a display control unit 32 that displays the state of the plant G in accordance with the placement positions of the multiple gas detection devices 2. Therefore, the plant condition detection system 1 can display the state of the plant G in accordance with the placement positions of the multiple gas detection devices 2, making it easy to grasp the state of the plant G within the cultivation area R through visual means.

[0072] Although embodiments of this disclosure have been described, these embodiments describe only a part of the embodiments of the plant condition detection system and gas detection device according to this disclosure, and the plant condition detection system and gas detection device according to this disclosure are not limited to those described in the above embodiments. The plant condition detection system and gas detection device according to this disclosure may be modified or applied to other plant condition detection systems and gas detection devices according to the above embodiments without changing the gist of each claim.

[0073] For example, in the plant condition detection system 1 and gas detection device 2 according to the above embodiment, the gas information detected by the gas detection device 2 is transmitted to the server 3 via the Internet N, but the gas information may also be transmitted via a communication line other than the Internet N. Alternatively, the gas detection device 2 may be connected to a plant condition detection device using a wired or wireless connection, and the gas information detected by the gas detection device 2 may be transmitted to the plant condition detection device. In this case, by making a personal computer function as a plant condition detection device, the personal computer can perform plant condition detection and display the state of the plant G.

[0074] Furthermore, in the plant condition detection system 1 and gas detection device 2 according to the above embodiment, a container 26 containing the gas detection unit 21 is installed near the plant G. However, the plant G may be placed inside the container 26, and the gas from the plant G may be detected to determine the state of the plant G.

[0075] Furthermore, the multiple gas detection devices 2 may be installed freely, not necessarily at equal intervals. For example, each of the multiple gas detection devices 2 may be installed in a position that makes it easy to detect the gas emitted from the plant G. In this case, the server 3 can be configured to acquire the installation positions of the multiple gas detection devices 2. The display control unit 32 of the server 3 can display the gas detection devices 2 and the state of the plant G in association with each other based on their installation positions. [Explanation of Symbols]

[0076] 1...Plant condition detection system, 2...Gas detection device, 3...Server (plant condition detection equipment), 4...Terminal equipment, 21...Gas detection unit, 22...Environment detection unit, 23...Communication unit, 24...Suction device, 25...Battery, 26...Container, 31...Plant condition detection unit, 32...Display control unit, 33...Recording unit, 34...Communication unit (output unit), G...Plant, R...Cultivation area.

Claims

1. A gas detection device having a gas detection unit that detects gases emitted from plants, The plant condition detection device includes a gas detection unit that acquires gas information detected by the gas detection unit and detects the temperature stress of the plant based on the gas information, The gas detection device comprises a container housing the gas detection unit and a suction device provided in the container for drawing air from around the plant into the container. The gas detection unit detects either or both of the following gases: green leaf alcohol and green leaf aldehyde. Plant condition detection system.

2. The gas detection unit detects either or both of ethylene and carbon dioxide as the gas. The plant condition detection system according to claim 1.

3. The gas detection unit has a semiconductor gas sensor using a metal oxide as a sensor for detecting green leaf alcohol or green leaf aldehyde. The plant condition detection system according to claim 1.

4. The gas detection devices are provided in multiple locations within the cultivation area where multiple plants are grown, and are installed at equal intervals. The plant condition detection system according to claim 1.

5. The system includes a display control unit that displays the status of the plant in accordance with the arrangement positions of the multiple gas detection devices. The plant condition detection system according to claim 4.

6. A gas detection unit that detects gases emitted from plants, An output unit outputs gas information of the gas detected by the gas detection unit as information for detecting temperature stress in the plant, A container housing the gas detection unit, A suction device that draws the air surrounding the plant into the container, Equipped with, The gas detection unit detects either or both of the following gases: green leaf alcohol and green leaf aldehyde. Gas detection device.

7. The gas detection unit detects either or both of ethylene and carbon dioxide as the gas. The gas detection device according to claim 6.

8. The gas detection unit has a semiconductor gas sensor using a metal oxide as a sensor for detecting green leaf alcohol or green leaf aldehyde. The gas detection device according to claim 6.

9. The gas detection units are provided in multiple locations within the cultivation area where multiple plants are grown, and are installed at equal intervals. The gas detection device according to claim 6.

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