Cultivation system and cultivation method

Abstract

To provide a cultivation system that can appropriately perform plant cultivation using breeding water of seawater fish.SOLUTION: A cultivation system comprises: a cultivation tank 30 which cultivates tomato A by using nutritious liquid W1; a nutritious liquid tank 40 in which the nutritious liquid W1 is stored; a filter tank 20 in which breeding water W2 which contains fresh water and salt and is used for breeding seawater fish B is stored; a mixture tank 50 in which mixed liquid W3 obtained by mixing the nutritious liquid W1 and the breeding water W2 is stored; supply means Ka which can supply the nutritious liquid W1 in the nutritious liquid tank 40 and the mixed liquid W3 in the mixture tank 50 to a predetermined supply destination; and a controller 60 which can execute normal cultivation control (S10) of operating the supply means Ka so as to supply the nutritious liquid W1 in the nutritious liquid tank 40 to the cultivation tank 30, and mixed liquid cultivation control (S20) of operating the supply means Ka so as to supply the mixed liquid W3 in the mixture tank 50 to the cultivation tank 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cultivation system and a cultivation method for cultivating plants using breeding water used for breeding saltwater fish. [Background technology]

[0002] Conventionally, plant cultivation techniques have been publicly known, as described in Patent Document 1, for example.

[0003] Patent Document 1 describes a method for cultivating fruit vegetables in which tomatoes with a high sugar content are cultivated by applying stress to the tomatoes. As an example of the cultivation method, Patent Document 1 discloses a method for cultivating tomatoes with a high sugar content by applying salt to tomatoes and applying salt stress to the tomatoes.

[0004] Recently, a technique for cultivating saltwater fish on land has become known. When cultivating saltwater fish on land, salt-containing rearing water is used. It is believed that the rearing water used for rearing saltwater fish can be used to impart salt stress to plants such as tomatoes.

[0005] However, the rearing water may not have a salt concentration suitable for plant cultivation, and therefore, if the rearing water is directly applied to tomatoes, salt damage may occur, making it difficult to grow tomatoes properly. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-100595 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and the problem it aims to solve is to provide a cultivation system and a cultivation method that can suitably cultivate plants using breeding water for saltwater fish. [Means for solving the problem]

[0008] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0009] That is, in claim 1, the system comprises a cultivation tank for cultivating plants using a nutrient solution, a nutrient solution tank for storing the nutrient solution, a breeding water tank for storing breeding water containing fresh water and salt and used for breeding fish, a mixing tank for storing a mixed solution obtained by mixing the nutrient solution and the breeding water, a supplying means capable of supplying the nutrient solution in the nutrient solution tank and the mixed solution in the mixing tank to a predetermined supply destination, and a control unit capable of executing normal cultivation control that operates the supplying means to supply the nutrient solution in the nutrient solution tank to the cultivation tank, and mixed solution cultivation control that operates the supplying means to supply the mixed solution in the mixing tank to the cultivation tank.

[0010] In claim 2, the supply means is capable of supplying the breeding water in the breeding water tank to a predetermined supply destination, and the control unit is capable of executing mixing control in the mixed solution cultivation control, which controls the operation of the supply means so as to supply the nutrient solution and the breeding water to the mixing tank at a predetermined ratio.

[0011] In claim 3, a growth detection unit is provided that can detect the growth status of the plants in the cultivation tank, and the control unit can determine the timing to execute the mixed liquid cultivation control based on the detection results of the growth detection unit.

[0012] In claim 4, the present invention is provided with a first water volume detection unit capable of detecting the volume of water in the mixing tank, and the control unit is capable of executing mixed solution adjustment control in which, when the detection result of the first water volume detection unit is equal to or less than a first water volume, the control unit operates the supply means to automatically supply the nutrient solution in the nutrient solution tank and the breeding water in the breeding water tank to the mixing tank at a predetermined ratio in the mixed solution cultivation control.

[0013] In claim 5, the system includes a first salinity detection unit capable of detecting the salinity concentration in the mixing tank and a first freshwater supply device that supplies the freshwater to the mixing tank, and the control unit, during the mixed liquid adjustment control, when the detection result of the first salinity detection unit is higher than a first concentration, operates the first freshwater supply device until the detection result of the first salinity detection unit becomes equal to or lower than the first concentration.

[0014] In claim 6, the system includes a second water volume detection unit capable of detecting the water volume in the breeding water tank, a second salinity detection unit capable of detecting the salt concentration in the breeding water tank, and a second freshwater supply device that supplies the freshwater to the breeding water tank, and the control unit operates the second freshwater supply device until the detection result of the second salinity detection unit becomes less than the second concentration when the detection result of the second water volume detection unit is less than the second water volume and the detection result of the second salinity detection unit is higher than the second concentration.

[0015] In claim 7, the invention includes a breeding water supplying device that supplies the breeding water to the breeding water tank, and the control unit operates the breeding water supplying device when the detection result of the second water level detection unit is lower than the second water level until the detection result of the second water level detection unit becomes a third water level that is higher than the second water level.

[0016] In claim 8, the apparatus further comprises a culture tank for cultivating the fish using the culture water, and the culture water tank stores the culture water discharged from the culture tank.

[0017] In claim 9, the method includes a normal cultivation step of supplying a nutrient solution used for cultivating plants to a cultivation tank in which the plants are cultivated, a mixing step of producing a mixed solution by mixing the nutrient solution with breeding water containing fresh water and salt and used for raising fish, and a mixed solution cultivation step of supplying the mixed solution to the cultivation tank. [Effects of the Invention]

[0018] The present invention has the following effects.

[0019] In the present invention, plants can be preferably cultivated using breeding water for saltwater fish. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is an explanatory diagram showing a cultivation system according to one embodiment of the present invention; [Figure 2] FIG. 1 is a block diagram showing a cultivation system. [Figure 3] 4 is a flowchart showing control executed by the cultivation system. [Figure 4] FIG. 10 is an explanatory diagram showing a state in which normal cultivation control is being performed. [Figure 5] FIG. 10 is an explanatory diagram showing a state in which mixed solution cultivation control is being performed. [Figure 6] 10 is a flowchart showing mixing start control. [Figure 7] 10 is a flowchart showing mixed liquid adjustment control. [Figure 8] 10 is a flowchart showing rearing water adjustment control. DETAILED DESCRIPTION OF THE INVENTION

[0021] A cultivation system 1 according to one embodiment of the present invention will be described below. The cultivation system 1 is used to cultivate plants using a nutrient solution W1. Fruit vegetables can be used as the plants. In this embodiment, an example of cultivating a tomato A as a fruit vegetable plant will be described. It is known that the sugar content of fruit vegetables such as tomatoes can be improved by applying stress during cultivation. Furthermore, a known method of applying stress is to apply salt stress (salt stress) to fruit vegetables.

[0022] In recent years, a technique for cultivating saltwater fish on land has become known. When cultivating saltwater fish on land, salty water is used.

[0023] The cultivation system 1 according to this embodiment can apply salt stress to tomatoes A by using breeding water W2 that has been used to cultivate saltwater fish B. A detailed description of the method of applying salt stress by using breeding water W2 will be given later. The cultivation system 1 constitutes an aquaponics system that can simultaneously cultivate saltwater fish B and tomatoes A using breeding water W2. The configuration of the cultivation system 1 will be described below with reference to FIGS. 1 and 2. The cultivation system 1 includes a culture tank 10, a filtration tank 20, a cultivation tank 30, a nutrient solution tank 40, a mixing tank 50, and a control device 60.

[0024] The culture tank 10 is used to culture saltwater fish B. The culture tank 10 stores breeding water W2. The breeding water W2 contains mineral components, such as salt, that are considered essential for growing saltwater fish B. As the breeding water W2, for example, artificial seawater with a lower salinity than natural seawater can be used.

[0025] Ammonia (ammonia nitrogen) is contained in excrement of the saltwater fish B cultured in the culture tank 10. In the cultivation system 1, the ammonia nitrogen can be oxidized to nitrate, nitrite, etc. in the filtration tank 20 described below.

[0026] The filtration tank 20 filters the breeding water W and adjusts the composition of the breeding water W. The filtration tank 20 is provided with a filter medium capable of filtering (biological filtration) the breeding water W. By using the filter medium, it is possible to remove substances to be removed from the breeding water W. The filter medium oxidizes ammonia nitrogen (ammonia nitrogen contained in the excrement of the saltwater fish B in the aquaculture tank 10) in the breeding water W that passes through the filter medium, converting it to nitrite nitrogen, and further oxidizes the nitrite nitrogen to nitrate (nitrification). Note that the filtration method using the filter medium is not limited to biological filtration; for example, physical filtration (sedimentation filtration, sand filtration, membrane filtration, foam separation, etc.) can also be used. The filtration tank 20 is equipped with a water level sensor 21, a water quality sensor 22, a freshwater supply device 23, and a breeding water supply device 24.

[0027] The water level sensor 21 shown in Fig. 1 is capable of detecting the water level of the breeding water W in the filtration tank 20. The water level sensor 21 is provided inside the filtration tank 20. As the water level sensor 21, various sensors capable of detecting the water level can be used.

[0028] The water quality sensor 22 is capable of detecting the water quality of the breeding water W in the filtration tank 20. The water quality sensor 22 is capable of detecting the salinity concentration of the breeding water W. The water quality sensor 22 is provided in the filtration tank 20. As the water quality sensor 22, various sensors capable of detecting salinity concentration can be used, such as those that detect the salinity concentration based on the measurement results of the EC (electrical conductivity) or TDS (total dissolved solids) of the breeding water W.

[0029] The freshwater supply device 23 is capable of supplying freshwater to the filtration tank 20. Here, "freshwater" refers to water that does not contain salt, such as tap water. The freshwater supply device 23 can supply freshwater to the filtration tank 20 via a path through which freshwater can flow.

[0030] The breeding water supply device 24 is capable of supplying breeding water W to the filtration tank 20. The breeding water supply device 24 can supply breeding water W2 to the filtration tank 20 via a path through which the breeding water W2 can flow. The breeding water supply device 24 supplies breeding water W2 from a predetermined supply source (not shown). The supply source has breeding water W2 with a predetermined salinity concentration prepared in advance.

[0031] The cultivation tank 30 is for cultivating tomatoes A. Multiple plants of tomatoes A can be cultivated in the cultivation tank 30. In the cultivation tank 30, hydroponics is carried out by providing the tomatoes A with a nutrient solution W1 (culture solution). Here, the nutrient solution W1 is a solution in which fertilizer is dissolved in water. The nutrient solution W1 contains various components mixed in proportions suitable for tomatoes A. In the cultivation tank 30, cultivation is carried out using a solid medium such as rock wool or coconut shell. Note that the medium used in the cultivation tank 30 is not limited to those mentioned above, and various mediums generally used for fruit vegetables can be used. Furthermore, in the cultivation tank 30, a cultivation method using, for example, artificial light can be used. The cultivation tank 30 is equipped with a camera 31.

[0032] The camera 31 is capable of capturing images of the tomatoes A in the cultivation tank 30. The camera 31 can acquire image data that is the result of capturing images of the tomatoes A. The camera 31 can capture images of the tomatoes A at predetermined intervals (for example, once a day). By acquiring image data of the tomatoes A using the camera 31, the growth status of the tomatoes A can be monitored.

[0033] The nutrient solution tank 40 stores the nutrient solution W1. Although not shown, the nutrient solution tank 40 is provided with a device for supplying the nutrient solution W1 from an appropriate supply source. The nutrient solution tank 40 may also be provided with a freshwater supply device for supplying fresh water, which is generally similar to the freshwater supply device 23. When the freshwater supply device is provided, the components of the nutrient solution W1 can be adjusted (diluted).

[0034] The mixing tank 50 stores a mixed solution W3 obtained by mixing the culture water W2 and the nutrient solution W1. In the mixing tank 50, the culture water W2 supplied from the filtration tank 20 and the nutrient solution W1 supplied from the nutrient solution tank 40 are mixed. The supply of the culture water W2 and the nutrient solution W1 will be described in detail later. The mixing tank 50 is equipped with a water level sensor 51, a water quality sensor 52, and a freshwater supply device 53.

[0035] The water level sensor 51 shown is capable of detecting the water level of the mixed liquid W3 in the mixing tank 50. The water level sensor 51 is provided in the mixing tank 50. As the water level sensor 51, a sensor similar to the water level sensor 21 can be used.

[0036] The water quality sensor 52 is capable of detecting the water quality of the mixed liquid W3 in the mixing tank 50. The water quality sensor 52 is capable of detecting the salinity concentration of the mixed liquid W3. The water quality sensor 52 is provided in the mixing tank 50. A sensor similar to the water quality sensor 22 can be used as the water quality sensor 52.

[0037] The freshwater supply device 53 is capable of supplying freshwater to the mixing tank 50. The freshwater supply device 53 is capable of supplying freshwater to the mixing tank 50 via a path through which freshwater can flow.

[0038] 1, the culture tank 10, the filtration tank 20, the cultivation tank 30, the nutrient solution tank 40, and the mixing tank 50 are connected to one another via piping K. The piping K includes a first piping K1, a second piping K2, a third piping K3, a fourth piping K4, a fifth piping K5, and a sixth piping K6.

[0039] The first pipe K1 and the second pipe K2 connect the aquaculture tank 10 and the filtration tank 20 to each other. The breeding water W2 in the aquaculture tank 10 is discharged to the filtration tank 20 through the first pipe K1. The discharged breeding water W2 is filtered using the filter material in the filtration tank 20, and then supplied to the aquaculture tank 10 through the second pipe K2.

[0040] The third pipe K3 connects the cultivation tank 30 and the nutrient solution tank 40. The nutrient solution W1 in the nutrient solution tank 40 is supplied to the cultivation tank 30 via the third pipe K3.

[0041] The fourth pipe K4 connects the nutrient solution tank 40 and the mixing tank 50 to each other. The nutrient solution W1 in the nutrient solution tank 40 is supplied to the mixing tank 50 via the fourth pipe K4. In this embodiment, the end of the fourth pipe K4 on the nutrient solution tank 40 side in the flow direction is connected to the third pipe K3 (branched from the third pipe K3). In the following explanation, the end of each pipe in the flow direction will be simply referred to as the "end."

[0042] As described above, the fourth pipe K4 according to this embodiment is connected to the nutrient solution tank 40 via the third pipe K3. A switching valve Kb is provided at the connection between the third pipe K3 and the fourth pipe K4, which is capable of switching between a mode in which the nutrient solution W1 in the nutrient solution tank 40 is circulated through the third pipe K3 and supplied to the cultivation tank 30, and a mode in which the nutrient solution W1 in the nutrient solution tank 40 is circulated through the fourth pipe K4 and supplied to the mixing tank 50. The fourth pipe K4 is provided with a first flow meter X1 which is capable of detecting the flow rate of the nutrient solution W1 circulating through the fourth pipe K4.

[0043] The fifth pipe K5 connects the filtration tank 20 and the mixing tank 50 to each other. The breeding water W2 in the filtration tank 20 is supplied to the mixing tank 50 via the fifth pipe K5. The fifth pipe K5 is provided with a second flow meter X2 that can detect the flow rate of the breeding water W2 flowing through the fifth pipe K5.

[0044] The sixth pipe K6 connects the cultivation tank 30 and the mixing tank 50. The mixed solution W3 in the mixing tank 50 is supplied to the cultivation tank 30 via the sixth pipe K6. In this embodiment, the end of the sixth pipe K6 on the cultivation tank 30 side is connected to the third pipe K3. In this way, the sixth pipe K6 according to this embodiment is connected to the cultivation tank 30 via the third pipe K3.

[0045] The piping K is provided with a supply means Ka for supplying each liquid (the breeding water W2, the nutrient solution W1, and the mixed solution W3) to each destination (the aquaculture tank 10, the filtration tank 20, and the cultivation tank 30) (see FIG. 2). Note that FIG. 1 does not specifically illustrate the supply means Ka. The supply means Ka includes pumps for circulating each liquid, a switching valve Kb for switching the circulation path, and a flow control valve that can switch between allowing and stopping the discharge of each liquid from each tank and each tank (the aquaculture tank 10, the filtration tank 20, the cultivation tank 30, the nutrient solution tank 40, and the mixing tank 50). Appropriate solenoid valves can be used as the switching valve Kb and the flow control valve. Furthermore, the switching valve Kb is not limited to being installed at the connection portion between the third pipe K3 and the fourth pipe K4, but can also be installed at other connection portions of the piping K. The positions and numbers of the pumps and flow control valves can be set as appropriate.

[0046] The control device 60 performs various processes related to the cultivation system 1. The control device 60 is equipped with an arithmetic device and a storage device, and can perform arithmetic processing using information stored in the storage device to perform processes related to the cultivation system 1. The control device 60 is configured to be able to communicate with each device of the cultivation system 1 (the water level sensor 21, the water quality sensor 22, the freshwater supply device 23, the breeding water supply device 24, the camera 31, the water level sensor 51, the water quality sensor 52, the freshwater supply device 53, etc.).

[0047] The control device 60 can control the operation of each device in the cultivation system 1. Specifically, the control device 60 can control the operation of each water supply device (the freshwater supply device 23, the rearing water supply device 24, and the freshwater supply device 53) and the supply means Ka of the piping K. The control device 60 can also acquire the detection results of each sensor (the water level sensor 21, the water quality sensor 22, and the water level sensor 51) and image data from the camera 31. The control device 60 stores information required for preset control. Specifically, the control device 60 stores the timing for switching the supply paths of each liquid by the supply means Ka and the dilution ratio of the mixed solution W3 stored in the mixing tank 50 (the mixing ratio of the nutrient solution W1 and the rearing water W2). The timing for switching the supply paths and the dilution ratio of the mixed solution W3 will be described in detail later.

[0048] The control device 60 controls the operation of the above-mentioned devices and the supply means Ka, thereby enabling the cultivation of tomatoes A and the cultivation of saltwater fish B. Specifically, the control device 60 is capable of executing "normal cultivation control (S10)" and "mixed solution cultivation control (S20)." Each control will be explained below with reference to Figs. 3 to 8. Fig. 3 is a flowchart showing the relationship between the normal cultivation control (S10) and the mixed solution cultivation control (S20). In Figs. 4 and 5, the parts of the piping K through which the rearing water W2, nutrient solution W1, and mixed solution W3 flow are indicated by solid lines, and the parts through which they do not flow are indicated by dashed lines.

[0049] First, the "normal cultivation control (S10)" will be described with reference to FIG. 4. The normal cultivation control (S10) is a control for performing hydroponics (normal cultivation) using the nutrient solution W1 without applying salt stress to the tomatoes A in the cultivation tank 30. The normal cultivation control (S10) is executed, for example, when cultivation of the tomatoes A in the cultivation tank 30 starts. The normal cultivation control (S10) can be executed in response to an operation by an operator. Note that instead of using an operation as a trigger for execution, it is also possible to employ a mode in which the control device 60 automatically executes the normal cultivation control (S10) when it detects the start of cultivation of the tomatoes A based on image data acquired by the camera 31.

[0050] As shown in Fig. 4, in normal cultivation control (S10), the nutrient solution W1 in the nutrient solution tank 40 flows through the third piping K3 and is supplied to the cultivation tank 30. In this control, the switching valve Kb of the piping K is switched to a state in which the nutrient solution W1 in the nutrient solution tank 40 flows only to the cultivation tank 30, without flowing to the mixing tank 50 (fourth piping K4). As a result, only the nutrient solution W1 is supplied to the cultivation tank 30.

[0051] In addition, in the normal cultivation control (S10), the culture water W2 flows through the first pipe K1 and the second pipe K2 so as to circulate through the aquaculture tank 10 and the filtration tank 20. In this control, the flow of the culture water W2 in the filtration tank 20 to the mixing tank 50 is stopped.

[0052] The control device 60 ends the normal cultivation control (S10) when it is determined in the mixing start control (S22) described below that it is time to apply salt stress to the tomatoes A (step S101: YES).

[0053] As described above, in the normal cultivation control (S10), the supply of the breeding water W2 and the nutrient solution W1 to the mixing tank 50 is stopped. In the illustrated example, the mixing tank 50 is shown empty. In the normal cultivation control (S10), the cultivation of the saltwater fish B and the cultivation of the tomato A are carried out separately. According to the above control, in the early growth stage of the tomato A, the tomato can be cultivated by normal hydroponics without applying salt stress. This makes it possible to suppress the occurrence of salt damage to the tomato A in the early growth stage.

[0054] Next, the "mixed solution cultivation control (S20)" will be described with reference to Figures 5 to 8. The mixed solution cultivation control (S20) is a control that determines the timing to apply salt stress to the tomatoes A, and, based on the above determination result (step S101: YES), applies salt stress to the tomatoes A by supplying the mixed solution W3 to the tomatoes A in the cultivation tank 30 instead of the nutrient solution W1. The mixed solution cultivation control (S20) is executed while the normal cultivation control (S10) is being executed (for example, at the same timing as the normal cultivation control (S10)) (see Figure 3).

[0055] 5, in the mixed solution cultivation control (S20), the rearing water W2 in the filtration tank 20 and the nutrient solution W1 in the nutrient solution tank 40 are supplied to the mixing tank 50, and the mixed solution W3 in the mixing tank 50 is supplied to the cultivation tank 30. In this control, the switching valve Kb of the piping K is switched to a state in which the nutrient solution W1 in the nutrient solution tank 40 does not flow directly to the cultivation tank 30 but flows to the mixing tank 50 via the fourth piping K4.

[0056] When the mixed solution cultivation control (S20) is being performed, a mixed solution W3 containing salt is supplied to the cultivation tank 30. This allows salt stress to be applied to the tomatoes A, improving the sugar content of the fruits of the tomatoes A. In addition, nitrates and the like contained in the mixed solution W3 (breeding water W2) can be absorbed by the tomatoes A as nutrients.

[0057] The mixed solution cultivation control (S20) is executed until a predetermined period has elapsed (for example, until the time for harvesting the tomatoes A). The timing to stop the mixed solution cultivation control (S20) may be determined based on the detection results of the growth status of the tomatoes A using image data from the camera 31. The timing to stop the control may also be determined when a predetermined period has elapsed that is set in advance based on the growth period of the tomatoes A, or may be triggered by an operation by an operator.

[0058] 3, the mixed solution cultivation control (S20) includes a “mixing control (S21)” and a “rearing water adjustment process (S24).” Each control in the mixed solution cultivation control (S20) will be described below.

[0059] The "mixing control (S21)" is a control for supplying the culture water W2 in the filtration tank 20 and the nutrient solution W1 in the nutrient solution tank 40 to the mixing tank 50 at a predetermined ratio. The salt concentration of the culture water W2 is higher than the salt concentration generally used to cause salt stress to tomatoes A. Therefore, by executing the "mixing control (S21)", the culture water W2 is diluted to produce a mixed solution W3 with a salt concentration suitable for causing salt stress to tomatoes A. The "mixing control (S21)" is executed while the mixed solution cultivation control (S20) is being executed. As shown in FIG. 3, the "mixing control (S21)" includes a "mixing start control (S22)" and a "mixed solution adjustment control (S23)".

[0060] First, the "mixing start control (S22)" will be described below with reference to Fig. 6. The mixing start control (S22) is a control for starting the mixing of the breeding water W2 and the nutrient solution W1 in the mixing tank 50. The mixing start control (S22) is executed as a process at the time of initial startup (when the mixing tank 50 is empty) in the "mixing control (S21)."

[0061] By executing the mixing start control (S22), a predetermined amount of mixed solution W3 mixed at a predetermined dilution ratio (mixing ratio of the nutrient solution W1 and the rearing water W2) is stored in the mixing tank 50. More specifically, a lower limit value c and an upper limit value d, which is a value greater than the lower limit value c, are preset for the water level C1 of the mixed solution W3 in the mixing tank 50. The water level C1 of the mixed solution W3 is detected by a water level sensor 51.

[0062] Furthermore, a lower limit value e and an upper limit value f, which is a value higher than the lower limit value e, are preset for the salt concentration (EC value) of the mixed solution W3. The salt concentration of the mixed solution W3 is detected by a water quality sensor 52. The mixing ratio of the rearing water W2 and the nutrient solution W1 in the mixed solution W3 is set so that the salt concentration of the mixed solution W3 is a target value in the range of not less than the lower limit value e and not more than the upper limit value f. As the target value, a typical salt concentration value when applying salt stress to tomatoes (for example, an EC value of about 8.0) can be used.

[0063] Below, each process executed in the mixing start control (S22) will be explained using the flowchart of FIG. 6. In step S101, the control device 60 determines whether or not the third inflorescence of the tomato A in the cultivation tank 30 has bloomed, based on the image data of the camera 31. Here, the third inflorescence is the inflorescence that is the third tier from the bottom among the inflorescences of the tomato A. The control device 60 determines whether or not the third inflorescence has bloomed by recognizing the image of the image data of the camera 31. When the control device 60 determines, based on the image data, that the third inflorescences of a predetermined percentage or more of the tomato A plants among the multiple tomato A plants have bloomed, it can determine that "the third inflorescence has bloomed."

[0064] If the control device 60 determines that the third inflorescence has bloomed, it proceeds to the processing of step S101. At this time, the control device 60 ends the normal cultivation control (S10). On the other hand, if the control device 60 determines that the third inflorescence has not bloomed, it ends the mixing start control (S22). In this case, the normal cultivation control (S10) is maintained.

[0065] In step S102, the control device 60 controls the supply means Ka to supply the nutrient solution W1 in the nutrient solution tank 40 to the mixing tank 50. Specifically, the control device 60 switches the switching valve Kb at the connection between the third pipe K3 and the fourth pipe K4 so that the nutrient solution W1 can be supplied to the mixing tank 50 (see FIG. 5). At this point, the supply of the culture water W2 from the filtration tank 20 to the mixing tank 50 has been stopped. After executing the process of step S102, the control device 60 proceeds to the process of step S103.

[0066] In step S103, the control device 60 determines, based on the detection result of the first flow meter X1, whether the flow rate F1 of the nutrient solution W1 in the fourth pipe K4 (in this control, the total amount of the nutrient solution W1 flowing through the fourth pipe K4) has reached a preset water volume a. The water volume a is the target value of the water volume of the nutrient solution W1 supplied to the mixing tank 50 in the mixing start control (S22). The above water volume a is set based on the target value (for example, the upper limit value d) of the water volume of the mixed solution W3 stored in the mixing tank 50 and the ratio of the nutrient solution W1 in the mixed solution W3.

[0067] When the control device 60 determines that the flow rate F1 of the nutrient solution W1 has reached the water volume a (F1 = a) (when it determines that the flow rate F1 of the nutrient solution W1 is equal to or greater than the water volume a), it proceeds to the process of step S104. On the other hand, when the control device 60 determines that the flow rate F1 of the nutrient solution W1 has not reached the water volume a (F1 < a), it proceeds to the process of step S102. That is, in this case, the supply of the nutrient solution W1 from the nutrient solution tank 40 to the mixing tank 50 is performed until the flow rate F1 of the nutrient solution W1 reaches the water volume a.

[0068] In step S104, the control device 60 stops the supply of the nutrient solution W1 in the nutrient solution tank 40 to the mixing tank 50 and controls the supply means Ka to supply the breeding water W2 in the filtration tank 20 to the mixing tank 50. After executing the process of step S104, the control device 60 proceeds to the process of step S105.

[0069] In step S105, based on the detection result of the second flow meter X2, the control device 60 determines whether the flow rate F2 of the breeding water W2 in the fifth pipe K5 (in this control, the total amount of the breeding water W2 flowing through the fifth pipe K5) has reached a preset water volume b. The water volume b is the target value of the water volume of the breeding water W2 supplied to the mixing tank 50 in the mixing start control (S22). The above water volume b is set based on the target value of the water volume of the mixed liquid W3 stored in the mixing tank 50 (for example, the upper limit value d) and the ratio of the breeding water W2 in the mixed liquid W3. When the control device 60 determines that the flow rate F2 of the breeding water W2 has reached b (F2 = b) (when it is determined that the flow rate F2 of the breeding water W2 is equal to or greater than the water volume b), the process proceeds to step S106. On the other hand, when the control device 60 determines that the flow rate F2 of the breeding water W2 has not reached b (F2 < b), the process proceeds to step S104. That is, in this case, the supply of the breeding water W2 from the filtration tank 20 to the mixing tank 50 is continued until the flow rate F2 of the breeding water W2 reaches the water volume b.

[0070] In step S106, the control device 60 controls the supply means Ka to stop the supply of the breeding water W2 in the filtration tank 20 to the mixing tank 50. After executing the process of step S106, the control device 60 ends the mixing start control (S22).

[0071] By performing the above mixing start control (S22), the mixed liquid W3 mixed at a predetermined ratio is stored in the mixing tank 50 so as to reach a predetermined water level (for example, the upper limit value d). By executing the above mixing start control (S22), the preparation for supplying the mixed liquid W3 in the mixing tank 50 to the cultivation tank 30 is completed. After the mixing start control (S22) is completed, the control device 60 can supply the mixed liquid W3 stored in the mixing tank 50 to the cultivation tank 30 in the mixed liquid cultivation control (S20).

[0072] Next, the "mixed liquid adjustment control (S23)" shown in Fig. 7 will be described. The mixed liquid adjustment control (S23) is a control for adjusting the components of the mixed liquid W3 in the mixing tank 50 and refilling the mixed liquid W3 into the mixing tank 50. The mixed liquid adjustment control (S23) is executed while the mixing control (S21) is being executed after the mixing start control (S22) has ended. Each process executed in the mixed liquid adjustment control (S23) will be described below using the flowchart in Fig. 7.

[0073] In step S201, the control device 60 makes a determination based on the salinity concentration E of the mixed liquid W3 in the mixing tank 50, based on the detection result of the water quality sensor 52. If the control device 60 determines that the salinity concentration E of the mixed liquid W3 is equal to or greater than the lower limit e and equal to or less than the upper limit f, the control device 60 proceeds to processing in step S202. If the control device 60 determines that the salinity concentration E of the mixed liquid W3 is higher than the upper limit f, the control device 60 proceeds to processing in step S208. If the control device 60 determines that the salinity concentration E of the mixed liquid W3 is lower than the lower limit e, the control device 60 proceeds to processing in step S209.

[0074] In step S202, the control device 60 determines whether the water level C1 of the mixed liquid W3 in the mixing tank 50 is equal to or lower than a predetermined specified water level α based on the detection result of the water level sensor 51. A lower limit value c, for example, can be set as the specified water level α. Note that the specified water level α is not limited to the lower limit value c, and various values ​​can be used. If the control device 60 determines that the water level C1 of the mixed liquid W3 is equal to or lower than the specified water level α, it proceeds to processing in step S203. On the other hand, if the control device 60 determines that the water level C1 of the mixed liquid W3 is higher than the specified water level α, it ends the mixed liquid adjustment control (S23).

[0075] In step S203, the control device 60 controls the supply means Ka to supply the nutrient solution W1 in the nutrient solution tank 40 to the mixing tank 50. At this point, the supply of the rearing water W2 from the nutrient solution tank 40 to the mixing tank 50 is stopped. After executing the process of step S203, the control device 60 proceeds to the process of step S204.

[0076] In step S204, the control device 60 determines whether the flow rate F1 of the nutrient solution W1 in the fourth pipe K4 (the total amount of the nutrient solution W1 flowing through the fourth pipe K4 during this control) has reached a preset water volume β1 based on the detection result of the first flow meter X1. The water volume β1 is a target value for the amount of nutrient solution W1 to be replenished in the mixed solution adjustment control (S23). The water volume β1 is set based on the amount of water in the mixed solution W3 to be replenished and the ratio of the nutrient solution W1 in the mixed solution W3. In this embodiment, the difference (dc) between the upper limit d and the lower limit c of the water volume in the mixing tank 50 is used as the "amount of mixed solution W3 to be replenished." Furthermore, the "ratio of nutrient solution W1 in the mixed solution W3" is calculated based on the water volumes a and b used in the mixing start control (S22). Specifically, the water volume β1 is calculated using the formula "(dc) × a / (a + b)."

[0077] When the control device 60 determines that the flow rate F1 of the nutrient solution W1 has reached the water volume β1 (F1=β1) (when the control device 60 determines that the flow rate F1 of the nutrient solution W1 has reached or exceeded the water volume β1), the control device proceeds to the processing of step S205. On the other hand, when the control device 60 determines that the flow rate F1 of the nutrient solution W1 has not reached the water volume β1 (F1<β1), the control device proceeds to the processing of step S203. That is, in this case, the nutrient solution W1 is supplied from the nutrient solution tank 40 to the mixing tank 50 until the flow rate F1 of the nutrient solution W1 reaches the water volume β1.

[0078] In step S205, the control device 60 stops the supply of the nutrient solution W1 in the nutrient solution tank 40 to the mixing tank 50, and controls the supply means Ka to supply the rearing water W2 in the filtration tank 20 to the mixing tank 50. After executing the process of step S205, the control device 60 proceeds to the process of step S206.

[0079] In step S206, the control device 60 determines whether the flow rate F2 of the breeding water W2 in the fifth pipe K5 (the total amount of breeding water W2 flowing through the fifth pipe K5 in this control) has reached a preset water volume β2 based on the detection result of the second flow meter X2. The water volume β2 is a target value for the amount of breeding water W2 to be replenished in the mixed liquid adjustment control (S23). The water volume β2 is set based on the amount of mixed liquid W3 to be replenished and the ratio of breeding water W2 to the mixed liquid W3. In this embodiment, the water volume β1 is calculated using the formula "(dc) × b / (a + b)".

[0080] When the control device 60 determines that the flow rate F2 of the breeding water W2 has reached the water volume β2 (F2=β2) (when the control device 60 determines that the flow rate F2 of the breeding water W2 has reached or exceeded the water volume β2), it proceeds to the processing of step S207. On the other hand, when the control device 60 determines that the flow rate F2 of the breeding water W2 has not reached the water volume β2 (F2<β2), it proceeds to the processing of step S205. That is, in this case, the breeding water W2 is supplied from the filtration tank 20 to the mixing tank 50 until the flow rate F2 of the breeding water W2 reaches the water volume β2.

[0081] In step S207, the control device 60 controls the supply means Ka to stop the supply of the breeding water W2 in the filtration tank 20 to the mixing tank 50. After executing the process of step S207, the control device 60 ends the mixed solution adjustment control (S23).

[0082] In step S208, which is performed if it is determined in step S201 that the salinity concentration E of the mixed solution W3 is higher than the upper limit value f, the control device 60 operates the freshwater supply device 53 to supply fresh water to the mixing tank 50. In this process, the control device 60 can operate the freshwater supply device 53 to supply a fixed amount of fresh water to the mixing tank 50, for example. After executing the process of step S208, the control device 60 proceeds to the process of step S201. In this embodiment, the control device 60 executes the process of step S208 until the salinity concentration E of the mixed solution W3 becomes equal to or lower than the upper limit value f. By performing the above process, if the salinity concentration E of the mixed solution W3 is too high, the salinity concentration E of the mixed solution W3 can be adjusted by diluting it with fresh water.

[0083] In step S209, which is reached when it is determined that the salinity concentration E of the mixed solution W3 is lower than the lower limit e, the control device 60 executes control to issue an error. If the salinity concentration E of the mixed solution W3 is lower than the lower limit e, an abnormality in the water quality of the mixed solution W3 is considered. In this case, the control device 60 issues an error to notify the operator of the abnormality. The above error can be issued by a sound using a predetermined buzzer or by displaying a message on a display. After executing the process of step S209, the control device 60 ends the mixed solution adjustment control (S23).

[0084] By executing the mixed liquid adjustment control (S23), the components of the mixed liquid W3 in the mixing tank 50 can be adjusted automatically, and the mixed liquid W3 can be replenished into the mixing tank 50, thereby reducing the burden on the operator.

[0085] Each control of the mixing control (S21) has been described above. According to the above control, a predetermined amount of mixed solution W3 can be produced in the mixing tank 50. In the mixed solution cultivation control (S20), the control device 60 can supply the mixed solution W3 produced in the mixing control (S21) to the cultivation tank 30.

[0086] The above control allows tomatoes A of the desired quality to be cultivated while reducing the burden on the worker. That is, the quality of the harvested fruits of tomatoes A, such as tomatoes, changes depending on the timing of salt stress application and the strength of the salt (salt concentration), such as sugar content, size, and taste. The above control allows the water supplied to the cultivation tank 30 to be automatically switched from the nutrient solution W1 to the mixed solution W3 at an appropriate timing in accordance with the growth status of the tomatoes A. This allows tomatoes A of the desired quality to be cultivated. Furthermore, the above control allows the nutrient solution W1 and the rearing water W2 to be automatically mixed so that the mixed solution W3 has an appropriate salt concentration. This allows the sugar content of the tomatoes A to be improved while suppressing salt damage to the tomatoes A due to the supply of excessive salt.

[0087] Next, the "rearing water adjustment control (S24)" shown in Fig. 8 will be described. The rearing water adjustment control (S24) adjusts the composition of the rearing water W2 in the filtration tank 20 and also replenishes the rearing water W2 to the filtration tank 20. The rearing water adjustment control (S24) can be executed while the mixed solution cultivation control (S20) is being executed.

[0088] Here, a lower limit value i and an upper limit value j, which is a value greater than the lower limit value i, are preset for the water level C2 of the breeding water W2 in the filtration tank 20. The water level C2 of the breeding water W2 is detected by a water level sensor 21.

[0089] Furthermore, a lower limit k and an upper limit l, which is a value higher than the lower limit k, are preset for the salinity concentration (EC value) of the breeding water W2. The salinity concentration of the breeding water W2 is detected by the water quality sensor 22. The salinity concentration of the breeding water W2 is set to a target value in the range between the lower limit k and the upper limit l. As the target value, a salinity value (for example, an EC value of about 15.0) that allows the growth of saltwater fish B can be adopted.

[0090] Below, each step executed in the rearing water adjustment control (S24) will be explained using the flowchart in Figure 8. In step S301, the control device 60 determines whether the water level C2 of the rearing water W2 in the filtration tank 20 is equal to or lower than the lower limit i, based on the detection result of the water level sensor 21. If the control device 60 determines that the water level C2 of the rearing water W2 is equal to or lower than the lower limit i, it proceeds to step S302. On the other hand, if the water level C2 of the rearing water W2 is higher than the lower limit i, the control device 60 ends the rearing water adjustment control (S24).

[0091] In step S302, the control device 60 makes a determination based on the salinity concentration S of the breeding water W2 in the filtration tank 20, based on the detection result of the water quality sensor 22. If the control device 60 determines that the salinity concentration S of the breeding water W2 is higher than the upper limit value 1, it proceeds to processing in step S303. If the control device 60 determines that the salinity concentration S of the breeding water W2 is equal to or higher than the lower limit value k and equal to or lower than the upper limit value 1, it proceeds to processing in step S307. If the control device 60 determines that the salinity concentration S of the breeding water W2 is lower than the lower limit value k, it proceeds to processing in step S310.

[0092] In the processing from step S303 to step S306, the control device 60 operates the freshwater supply device 23 to supply freshwater to the filtration tank 20 until the salinity concentration S of the breeding water W2 becomes equal to or greater than the lower limit k and equal to or less than the upper limit l. In this case, the drop in the water level in the filtration tank 20 is due to evaporation of water, and it is presumed that this is causing the salinity concentration S of the breeding water W2 to increase. By supplying freshwater to the filtration tank 20 through the above processing, the salinity concentration S can be reduced while raising the water level. After performing the above processing, the control device 60 proceeds to processing in step S306.

[0093] In step S306, the control device 60 determines whether the water level C2 of the breeding water W2 in the filtration tank 20 is equal to or lower than the upper limit j. If the control device 60 determines that the water level C2 of the breeding water W2 is equal to or lower than the upper limit j, it terminates the breeding water adjustment control (S24). On the other hand, if the control device 60 determines that the water level C2 of the breeding water W2 is lower than the upper limit j, it proceeds to step S307.

[0094] In steps S307 to S309, the control device 60 operates the breeding water supply device 24 to supply the breeding water W2 to the filter tank 20 until the water level C2 of the breeding water W2 in the filter tank 20 reaches the upper limit j. In this case, the cause of the drop in the water level in the filter tank 20 is presumed to be that the breeding water W2 was supplied to the mixing tank 50, causing the water level to drop while maintaining the salinity of the breeding water W2, or that the water level dropped due to evaporation, and although a process to lower the salinity by supplying fresh water (steps S303 to S306) was performed, the water level has not yet reached the upper limit j. By supplying the breeding water W2 to the filter tank 20 through the above processes, the water level C2 of the breeding water W2 can be raised while maintaining the salinity. After performing the above processes, the control device 60 terminates the breeding water adjustment control (S24).

[0095] In step S310, which is reached when it is determined in step S302 that the salinity concentration S of the breeding water W2 is lower than the lower limit k, the control device 60 executes control to issue an error. If the salinity concentration S of the breeding water W2 is lower than the lower limit k, an abnormality in the water quality of the breeding water W2 is suspected. In this case, the control device 60 issues an error to notify the operator of the abnormality, generally similar to step S209 of the mixed solution adjustment control (S23). After executing the processing of step S302, the control device 60 terminates the breeding water adjustment control (S24).

[0096] The above has described the culture water adjustment control (S24). According to the above control, when the water level of the culture water W2 in the filtration tank 20 drops, either fresh water or the culture water W2 is automatically supplied to the filtration tank 20 based on the estimated cause, thereby adjusting the composition (salinity) of the filtration tank 20. This makes it possible to avoid impacts on aquaculture, such as idling of the pump due to a drop in the water level in the filtration tank 20.

[0097] In this way, the above control makes it possible to stabilize the salinity concentration of the mixed solution W3 produced using the culture water W2 in the filtration tank 20. Furthermore, by using the culture water W2 from the filtration tank 20 for cultivation, the culture water circulating through the aquaculture tank 10 and the filtration tank 20 is periodically exchanged, thereby reducing the nitrate concentration of the culture water W2 and improving the water quality. In this way, this embodiment can improve both the quality of the tomatoes A and the productivity of the saltwater fish B. Furthermore, in this embodiment, unlike normal water exchange, the culture water W2 is not discarded as is but is used for cultivating the tomatoes A (cascade use), thereby saving water and reducing the environmental load.

[0098] The above describes the cultivation system 1. Note that the control according to this embodiment is an example, and the control executed by the cultivation system 1 is not limited to the above example, and any processing may be added or changed. Also, the specific numerical values ​​exemplified in the above description are an example, and can be changed as desired.

[0099] For example, in the above example, the rearing water W2 (mixed solution W3) was used primarily to impart salt stress to tomato A, such as tomatoes, but the present invention is not limited to this. For example, in addition to the above-described configuration, the rearing water W2 in the filtration tank 20 may also be used to cultivate other plants (e.g., hydroponics) in a manner similar to that of a general aquaponics system. In this case, the rearing water W2 may be circulated so that the rearing water W2 purified (denitrified) by the other plants is supplied to the filtration tank 20 (aquaculture tank 10).

[0100] As described above, the cultivation system 1 according to this embodiment has the following features: A cultivation tank 30 for cultivating a tomato A (plant) using a nutrient solution W1; A nutrient solution tank 40 in which the nutrient solution W1 is stored; a filtration tank 20 (breeding water tank) containing freshwater and salt and storing breeding water W2 used to breed saltwater fish B (fish); a mixing tank 50 for storing a mixed solution W3 obtained by mixing the nutrient solution W1 and the breeding water W2; a supply means Ka capable of supplying the nutrient solution W1 in the nutrient solution tank 40 and the mixed solution W3 in the mixing tank 50 to a predetermined destination; a control device 60 (control unit) capable of executing a normal cultivation control (S10) for operating the supply means Ka so as to supply the nutrient solution W1 in the nutrient solution tank 40 to the cultivation tank 30, and a mixed solution cultivation control (S20) for operating the supply means Ka so as to supply the mixed solution W3 in the mixing tank 50 to the cultivation tank 30; It is equipped with the following.

[0101] With this configuration, it is possible to suitably cultivate tomatoes A using the breeding water W2 for saltwater fish B. That is, while the normal cultivation control (S10) is being performed, tomatoes A are cultivated by normal hydroponics without applying salt stress, and while the mixed solution cultivation control (S20) is being performed, salt stress can be applied to tomatoes A by supplying mixed solution W3 containing the salt of the breeding water W2 to the cultivation tank 30. This makes it possible to improve the sugar content of the fruits of tomatoes A while suppressing the occurrence of salt damage to tomatoes A.

[0102] Moreover, the supply means Ka is The breeding water W2 in the filtration tank 20 can be supplied to a predetermined destination, The control device 60 In the mixed solution cultivation control (S20), a mixing control (S21) can be executed to control the operation of the supply means Ka so that the nutrient solution W1 and the rearing water W2 are supplied to the mixing tank 50 at a predetermined ratio.

[0103] By configuring in this way, the workload of mixing the nutrient solution W1 and the rearing water W2 at a predetermined ratio can be reduced.

[0104] In addition, cultivation system 1 is The cultivation tank 30 is provided with a camera 31 (growth detection unit) capable of detecting the growth status of the tomato A, The control device 60 Based on the detection result of the camera 31, it is possible to determine the timing to execute the mixed solution cultivation control (S20) (step S101).

[0105] By configuring in this manner, salt stress can be applied at an appropriate time based on the growth status of the tomato A.

[0106] In addition, cultivation system 1 is A water level sensor 51 (first water level detection unit) capable of detecting the amount of water in the mixing tank 50 is provided. The control device 60 In the mixed solution cultivation control (S20), if the detection result of the water level sensor 51 is below the specified water level α (first water volume), the mixed solution adjustment control (S23) can be executed to operate the supply means Ka to automatically supply the nutrient solution W1 in the nutrient solution tank 40 and the breeding water W2 in the filtration tank 20 to the mixing tank 50 at a predetermined ratio (steps S202 to S206).

[0107] By configuring it in this way, when the mixed solution W3 in the mixing tank 50 decreases, the nutrient solution W1 and the rearing water W2 can be automatically mixed at a predetermined ratio, thereby reducing the workload.

[0108] In addition, cultivation system 1 is a water quality sensor 52 (first salinity detection unit) capable of detecting the salinity concentration in the mixing tank 50; a freshwater supply device 53 (first freshwater supply device) that supplies the freshwater to the mixing tank 50; Equipped with The control device 60 In the mixed liquid adjustment control (S23), if the detection result of the water quality sensor 52 is higher than the upper limit value f (first concentration) (step S201), the freshwater supply device 53 is operated until the detection result of the water quality sensor 52 becomes equal to or lower than the upper limit value f (step S208).

[0109] With this configuration, when the mixed solution W3 in the mixing tank 50 decreases and the salt concentration is high, fresh water is automatically replenished to lower the salt concentration. This allows the components of the mixed solution W3 in the mixing tank 50 to be suitably adjusted.

[0110] In addition, cultivation system 1 is a water level sensor 21 (second water level detection unit) capable of detecting the amount of water in the filtration tank 20; a water quality sensor 22 (second salinity detection unit) capable of detecting the salinity concentration in the filtration tank 20; a freshwater supply device 23 (second freshwater supply device) that supplies the freshwater to the filtration tank 20; Equipped with The control device 60 If the detection result of the freshwater supply device 23 is below a lower limit value i (second water volume) indicating the lower limit value of the water volume in the filtration tank 20, and the detection result of the water quality sensor 22 is higher than an upper limit value l (second concentration), the freshwater supply device 23 is operated until the detection result of the water quality sensor 22 reaches the upper limit value l (steps S301 to S305).

[0111] With this configuration, if the breeding water W2 in the filtration tank 20 decreases and the salt concentration is high, fresh water can be automatically replenished to lower the salt concentration. This allows the composition of the breeding water W2 in the filtration tank 20 to be suitably adjusted.

[0112] In addition, cultivation system 1 is a breeding water supply device 24 (breeding water supply device) that supplies the breeding water to the filtration tank 20; The control device 60 If the detection result of the water level sensor 21 is lower than the lower limit value i, the breeding water supply device 24 is operated (steps S301 to S309) until the detection result of the second water volume detection unit becomes a value higher than the lower limit value i and an upper limit value j (third water volume) indicating the upper limit value of the water volume in the filtration tank 20.

[0113] By configuring it in this manner, if the breeding water W2 in the filter tank 20 decreases but the salinity concentration is maintained, the breeding water W2 is automatically replenished, thereby raising the water level of the breeding water W2 in the filter tank 20 while maintaining the salinity concentration.

[0114] In addition, cultivation system 1 is The aquaculture tank 10 is provided for cultivating the saltwater fish B using the breeding water W2. The filtration tank 20 is The rearing water W2 discharged from the aquaculture tank 10 is stored therein.

[0115] By configuring it in this way, the cultivation system 1 can be applied to an aquaponics system in which the cultivation of tomatoes A and the cultivation of saltwater fish B are carried out simultaneously.

[0116] In addition, the cultivation method according to this embodiment includes: A normal cultivation step (normal cultivation control S10) of supplying a nutrient solution W1 used for cultivating a tomato A to a cultivation tank 30 in which the tomato A is cultivated; A mixing process (mixing control S21) for generating a mixed solution W3 by mixing the nutrient solution W1 with breeding water W2 containing freshwater and salt and used for breeding saltwater fish B; a mixed solution cultivation step (mixed solution cultivation control S20) of supplying the mixed solution W3 to the cultivation tank 30; It is equipped with the following.

[0117] By configuring in this way, the tomato A can be suitably cultivated using the breeding water W2 of the saltwater fish B.

[0118] The tomato A according to this embodiment is one embodiment of the plant according to the present invention. The saltwater fish B according to this embodiment is one embodiment of the fish according to the present invention. The filtration tank 20 according to this embodiment is one embodiment of the breeding water tank according to the present invention. The camera 31 according to this embodiment is one embodiment of a growth detection unit according to the present invention. The water level sensor 51 according to this embodiment is one embodiment of a first water level detection unit according to the present invention. The water quality sensor 52 according to this embodiment is an embodiment of a first salinity detection unit according to the present invention. The freshwater supply apparatus 53 according to this embodiment is one embodiment of the first freshwater supply apparatus according to the present invention. The upper limit value f according to this embodiment is an embodiment of the first concentration according to the present invention. The water level sensor 21 according to this embodiment is an embodiment of a second water level detection unit according to the present invention. The water quality sensor 22 according to this embodiment is an embodiment of a second salinity detection unit according to the present invention. The freshwater supply apparatus 23 according to this embodiment is one embodiment of a second freshwater supply apparatus according to the present invention. The lower limit value i according to this embodiment is an embodiment of the second water amount according to the present invention. Moreover, the upper limit value j according to this embodiment is one embodiment of the third water amount according to the present invention. Moreover, the upper limit value 1 according to this embodiment is one embodiment of the second concentration according to the present invention. The breeding water supply device 24 according to this embodiment is one embodiment of the breeding water supply device according to the present invention.

[0119] Although the embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0120] For example, although saltwater fish B is cultured in the culture tank 10, the type of fish cultured in the culture tank 10 is not limited to saltwater fish. For example, the culture tank 10 may be used to culture freshwater fish that can be cultured in water with a higher salt concentration than freshwater (seawater, artificial seawater, etc.).

[0121] In addition, in this embodiment, an example has been shown in which the camera 31 is used as the growth detection unit that detects the growth status of the tomato A, but the present invention is not limited to this. Various devices capable of detecting the growth status of the tomato A can be used as the growth detection unit. Furthermore, instead of automatically detecting the growth status of the tomato A using the growth detection unit, a configuration in which an operator monitors the growth status of the tomato A can also be used.

[0122] Furthermore, in this embodiment, the timing for executing the mixing start control (S22) is set to the time when the third inflorescence of tomato A blooms, but the timing for executing the mixing start control (S22) is not limited to the above example, and various timings can be adopted based on the growth status of tomato A. Furthermore, instead of determining the timing based on the detection result by the growth detection unit, the mixing start control (S22) may be executed when a preset period (for example, a period when the third inflorescence is predicted to bloom) has elapsed.

[0123] In the present embodiment, an example has been shown in which tomato A is used as the plant cultivated in the cultivation system 1, but the plant is not limited to the above example. Various plants can be used as the plant cultivated in the cultivation system 1, such as fruit vegetables other than tomatoes, other vegetables of the Solanaceae family such as bell peppers, and fruit trees. [Explanation of symbols]

[0124] 1. Cultivation system 10 Aquaculture tank 20 Filtration tank 30 cultivation tank 40 Nutrient solution tank 50 Mixing Tank 60 Control device

Claims

1. a cultivation tank for cultivating plants using a nutrient solution; a nutrient solution tank in which the nutrient solution is stored; a breeding water tank containing freshwater and salt and storing breeding water used for breeding fish; a mixing tank in which a mixed solution obtained by mixing the nutrient solution and the rearing water is stored; a supply means capable of supplying the nutrient solution in the nutrient solution tank and the mixed solution in the mixing tank to a predetermined destination; a control unit capable of executing a normal cultivation control for operating the supply means to supply the nutrient solution in the nutrient solution tank to the cultivation tank, and a mixed solution cultivation control for operating the supply means to supply the mixed solution in the mixing tank to the cultivation tank; A cultivation system comprising:

2. The supply means The breeding water in the breeding water tank can be supplied to a predetermined supply destination, The control unit In the mixed solution cultivation control, a mixing control can be executed to control the operation of the supply means so as to supply the nutrient solution and the rearing water to the mixing tank at a predetermined ratio. The cultivation system according to claim 1 .

3. A growth detection unit capable of detecting the growth status of the plants in the cultivation tank is provided, The control unit The timing for executing the mixed liquid cultivation control can be determined based on the detection result of the growth detection unit. The cultivation system according to claim 1 .

4. a first water amount detection unit capable of detecting the amount of water in the mixing tank; The control unit In the mixed solution cultivation control, when the detection result of the first water amount detection unit is equal to or less than a first water amount, a mixed solution adjustment control can be executed in which the supply means is operated to automatically supply the nutrient solution in the nutrient solution tank and the breeding water in the breeding water tank to the mixing tank at a predetermined ratio. The cultivation system according to claim 2.

5. a first salt content detection unit capable of detecting a salt content in the mixing tank; a first freshwater supply device that supplies the freshwater to the mixing tank; Equipped with The control unit In the mixed liquid adjustment control, when the detection result of the first salinity detection unit is higher than a first concentration, the first freshwater supply device is operated until the detection result of the first salinity detection unit becomes equal to or lower than the first concentration. The cultivation system according to claim 4.

6. a second water level detector capable of detecting the amount of water in the breeding water tank; a second salinity detector capable of detecting the salinity concentration in the breeding water tank; a second freshwater supply device that supplies the freshwater to the breeding water tank; Equipped with The control unit When the detection result of the second water amount detection unit is equal to or less than a second water amount and the detection result of the second salinity detection unit is higher than a second concentration, the second freshwater supply device is operated until the detection result of the second salinity detection unit becomes equal to or less than the second concentration. The cultivation system according to claim 1 .

7. a breeding water supply device that supplies the breeding water to the breeding water tank; The control unit When the detection result of the second water level detection unit is lower than the second water level, the breeding water supply device is operated until the detection result of the second water level detection unit becomes a third water level that is higher than the second water level. The cultivation system according to claim 6.

8. a fish farming tank for raising the fish using the breeding water; The breeding water tank comprises: The rearing water discharged from the aquaculture tank is stored. The cultivation system according to claim 1 .

9. A normal cultivation step of supplying a nutrient solution used for cultivating plants to a cultivation tank in which the plants are cultivated; a mixing step of mixing the nutrient solution with breeding water containing freshwater and salt and used for breeding fish, to produce a mixed solution; a mixed solution cultivation step of supplying the mixed solution to the cultivation tank; A cultivation method comprising the steps of:

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