Method for estimating carbon dioxide absorption, method for estimating carbon dioxide utilization efficiency, device for estimating carbon dioxide absorption, and device for estimating carbon dioxide utilization efficiency

Abstract

To provide a technology for estimating carbon dioxide absorption by plants.SOLUTION: A method for estimating the amount of carbon dioxide absorbed by plants grown within a facility includes: a first calculation step of calculating the amount of plant growth when carbon dioxide is supplied into the facility so that the carbon dioxide concentration within the facility matches the carbon dioxide concentration in the atmosphere; a second calculation step of calculating a first total amount of carbon dioxide absorbed by the plants based on the amount of growth; and a first estimation step of estimating the first total amount of carbon dioxide absorbed by the plants from the atmosphere as the value obtained by subtracting the first amount of carbon dioxide supplied from the first total amount of carbon dioxide absorbed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for estimating a carbon dioxide absorption amount, a method for estimating a carbon dioxide utilization efficiency, an apparatus for estimating a carbon dioxide absorption amount, and an apparatus for estimating a carbon dioxide utilization efficiency. [Background technology]

[0002] There is a known technology for increasing crop yields by supplying carbon dioxide (CO2) to horticultural crops. Although carbon dioxide is already being supplied to many solar plant factories, there is a need to control the amount of carbon dioxide supplied within the facility in a way that increases the yield increase effect while suppressing the outflow of carbon dioxide from the facility due to environmental considerations.

[0003] Currently, there are two main methods for controlling the amount of carbon dioxide supplied. The first method utilizes a zero-concentration difference supply, which equalizes the carbon dioxide concentration inside and outside the facility. This method supplies carbon dioxide without creating a difference in carbon dioxide concentration, so it can be assumed that no carbon dioxide escapes outside the facility. However, because it is not possible to achieve a high CO2 concentration inside the facility, it is difficult to increase the yield of crops. The second method involves changing the carbon dioxide concentration inside the facility depending on the opening degree of the ventilation windows. For example, the carbon dioxide concentration is increased (e.g., 800 ppm) when the ventilation windows are closed, and the carbon dioxide supply is controlled so that the set concentration decreases depending on the opening degree of the ventilation windows. This method can maintain a high carbon dioxide concentration inside the facility, which is effective in increasing yields, but it does not take into account the escape of carbon dioxide outside the facility. Therefore, a more effective method for controlling the amount of carbon dioxide supplied is needed.

[0004] In order to effectively control the amount of carbon dioxide supplied, it is effective to take into account the amount of carbon dioxide absorbed by plants. Patent Document 1 describes a technique for estimating the amount of carbon dioxide absorbed by plant roots based on the amount of root growth. Non-Patent Document 1 also describes a technique for calculating the amount of carbon dioxide absorbed by plants from the change in CO2 within a facility before and after the supply of carbon dioxide, and analyzing the efficiency of carbon dioxide use. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-066966 [Non-patent literature]

[0006] [Non-Patent Document 1] Kuroyanagi T. et al. (2014) Biosystems Engineering. 119:58-68 Summary of the Invention [Problem to be solved by the invention]

[0007] However, it is unclear whether the techniques described in Patent Document 1 and Non-Patent Document 1 can accurately estimate the amount of carbon dioxide absorbed by plants. Also, because it is not easy to measure the inflow and outflow of carbon dioxide inside and outside a facility, it is difficult to accurately estimate the amount of carbon dioxide absorbed by plants. Therefore, there is a need for a technique that can accurately estimate the amount of carbon dioxide absorbed by plants and control the amount of carbon dioxide supplied to a facility.

[0008] An object of one aspect of the present invention is to realize a technology for estimating the amount of carbon dioxide absorbed by plants. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, a method for estimating carbon dioxide absorption according to one embodiment of the present invention is a method for estimating the carbon dioxide absorption of a plant grown in a facility, and includes: a first calculation step of calculating, based on environmental conditions and biological conditions within the facility, the growth amount of the plant at the time of carbon dioxide supply in a first supply step of supplying carbon dioxide into the facility so that the carbon dioxide concentration within the facility matches the carbon dioxide concentration in the atmosphere; a second calculation step of calculating, based on the growth amount, a first total carbon dioxide absorption amount absorbed by the plant; and a first estimation step of estimating, as the first carbon dioxide absorption amount absorbed by the plant from the atmosphere, a value obtained by subtracting the first carbon dioxide supply amount in the first supply step from the first total carbon dioxide absorption amount.

[0010] A method for estimating carbon dioxide utilization efficiency according to one embodiment of the present invention includes a step of estimating carbon dioxide utilization efficiency based on at least one of a first carbon dioxide absorption amount and a second carbon dioxide absorption amount estimated using a method for estimating carbon dioxide absorption amount according to one embodiment of the present invention.

[0011] A carbon dioxide absorption estimation device according to one embodiment of the present invention is a carbon dioxide absorption estimation device that estimates the carbon dioxide absorption amount of a plant grown in a facility, and includes: a calculation unit that calculates, based on environmental conditions and biological conditions within the facility, the growth amount of the plant when carbon dioxide is supplied into the facility so that the carbon dioxide concentration within the facility matches the carbon dioxide concentration in the atmosphere, and calculates a first total carbon dioxide absorption amount absorbed by the plant based on the calculated growth amount; and an estimation unit that estimates, as the first carbon dioxide absorption amount absorbed by the plant from the atmosphere, a value obtained by subtracting, from the first total carbon dioxide absorption amount, the first carbon dioxide supply amount when carbon dioxide is supplied into the facility so that the carbon dioxide concentration within the facility matches the carbon dioxide concentration in the atmosphere.

[0012] The carbon dioxide utilization efficiency estimation device according to one embodiment of the present invention includes an estimation unit that estimates the carbon dioxide utilization efficiency based on at least one of a first carbon dioxide absorption amount and a second carbon dioxide absorption amount estimated using the carbon dioxide absorption amount estimation device according to one embodiment of the present invention.

[0013] The carbon dioxide absorption amount estimation device and carbon dioxide utilization efficiency estimation device according to each aspect of the present invention may be realized by a computer. In this case, the control program for the carbon dioxide absorption amount estimation device, which causes the computer to operate as each part (software element) of the carbon dioxide absorption amount estimation device and the carbon dioxide utilization efficiency estimation device, and the computer-readable recording medium on which the control program is recorded, also fall within the scope of the present invention. [Effects of the Invention]

[0014] According to one aspect of the present invention, a technique for estimating the amount of carbon dioxide absorbed by a plant can be realized. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a block diagram showing an example of a configuration of a main part of an estimation system including an aspect of a carbon dioxide absorption amount estimation device that executes a method for estimating a carbon dioxide absorption amount according to an aspect of the present invention. [Figure 2] 1 is a flowchart showing one aspect of the flow of an estimation process in a method for estimating a carbon dioxide absorption amount according to one aspect of the present invention. [Figure 3] 10 is a flowchart showing another aspect of the flow of the estimation process in the method for estimating the carbon dioxide absorption amount according to an aspect of the present invention. [Figure 4] FIG. 1 is a graph showing the relationship between environmental conditions, biological conditions, and carbon dioxide supply amount used in a method for estimating carbon dioxide absorption amount according to one embodiment of the present invention. [Figure 5] 1 is a flowchart showing one embodiment of the flow of a process for estimating carbon dioxide absorption efficiency in a method for estimating carbon dioxide utilization efficiency according to one embodiment of the present invention. [Figure 6] 1 is a flowchart showing one embodiment of the flow of a process for estimating an outflow rate of carbon dioxide in a method for estimating carbon dioxide utilization efficiency according to one embodiment of the present invention. [Figure 7] 1 is a flowchart showing one embodiment of the flow of a process for estimating a plant growth rate using carbon dioxide in a method for estimating carbon dioxide use efficiency according to one embodiment of the present invention. [Figure 8] 1 is a flowchart showing one embodiment of the flow of a process for estimating a plant growth rate using carbon dioxide in a method for estimating carbon dioxide use efficiency according to one embodiment of the present invention. [Figure 9] 1 is a graph showing the environmental conditions inside the facility measured in Example 1. [Figure 10] 1 is a graph showing the environmental conditions inside the facility measured in Example 2. [Figure 11] 1 shows the carbon dioxide concentration (ppm) and cumulative carbon dioxide application amount (L) measured or calculated during application of high-concentration carbon dioxide in Example 3. [Figure 12] 1 is a graph showing a function formula used in Example 3 to calculate the amount of carbon dioxide absorbed from the atmosphere. DETAILED DESCRIPTION OF THE INVENTION

[0016] [Method for estimating carbon dioxide absorption] A method for estimating carbon dioxide absorption (absorption amount estimation method) according to one embodiment of the present invention will be described in detail below. FIG. 1 is a block diagram showing an example of a configuration of a main part of an estimation system 100 including an embodiment of an absorption amount estimation device 10 that executes a method for estimating carbon dioxide absorption according to one embodiment of the present invention. The estimation system 100 includes an absorption amount estimation device 10 that executes a method for estimating carbon dioxide absorption according to one embodiment of the present invention. The estimation system 100 further includes a use efficiency estimation device 20 that executes a method for estimating carbon dioxide use efficiency (use efficiency estimation method) according to one embodiment of the present invention. The use efficiency estimation device 20 will be described in detail below. The estimation system 100 further includes an input device 30, an output device 40, and a storage device 50.

[0017] The input device 30 accepts input operations by a user to the estimation system 100. As an example, the input device 30 accepts input of data used to estimate the amount of carbon dioxide absorption in the absorption amount estimation device 10. The input device 30 accepts input of data used to estimate the carbon dioxide use efficiency in the utilization efficiency estimation device 20. The input device 30 outputs the accepted data to the absorption amount estimation device 10 or the utilization efficiency estimation device 20.

[0018] As an example, the output device 40 outputs the results estimated by the absorption amount estimation device 10 and the utilization efficiency estimation device 20. The manner of output by the output device 40 is not particularly limited. The output device 40 may be, for example, a display device that displays the estimation results as an image, a printing device that prints the estimation results, or a device that outputs the estimation results as sound. Furthermore, the output device 40 may be a display of a mobile device such as a smartphone that displays the results estimated by the absorption amount estimation device 10 or the utilization efficiency estimation device 20.

[0019] The storage device 50 stores programs and data used in the estimation system 100. For example, the storage device 50 stores various data input via the input device 30. For example, the storage device 50 also stores estimation results, data used for estimation, etc. in the absorption estimation device 10 and the utilization efficiency estimation device 20. The storage device 50 may also have a database on a cloud or a server that stores various data.

[0020] (Absorption amount estimation device 10) The absorption amount estimation device 10 is an information processing device that executes a carbon dioxide absorption amount estimation method for estimating the amount of carbon dioxide absorbed by plants grown within a facility. The carbon dioxide absorption amount estimated by the absorption amount estimation device 10 can be used by the use efficiency estimation device 20 to estimate the carbon dioxide use efficiency within the facility. The absorption amount estimation device 10 can accurately estimate the amount of carbon dioxide absorbed by plants, and this can be used to accurately estimate the carbon dioxide use efficiency within the facility. Then, based on the estimated carbon dioxide use efficiency, the carbon dioxide supply amount can be controlled so as to appropriately maintain the carbon dioxide concentration within the facility.

[0021] The absorption amount estimation device 10 includes a control unit 11. The control unit 11 controls each unit of the absorption amount estimation device 10, and is realized by, for example, a processor and a memory. In this example, the processor accesses a storage (not shown), loads a program (not shown) stored in the storage into the memory, and executes a series of instructions included in the program. This constitutes each unit of the control unit 11. As each unit, the control unit 11 includes a data acquisition unit 12, a calculation unit 13, and an estimation unit 14.

[0022] <Data Acquisition Unit 12> The data acquisition unit 12 receives input data input by a user. The data acquisition unit 12 acquires the amount of carbon dioxide supplied to the facility, the environmental conditions within the facility, and biological conditions that represent the state of plants growing within the facility. The data acquisition unit 12 also receives data transmitted from sensors installed within the facility that measure the environmental conditions. The data acquisition unit 12 sends the acquired data to the calculation unit 13 and the estimation unit 14.

[0023] <Calculation section 13:> <<Zero concentration difference carbon dioxide application>> The calculation unit 13 calculates the amount of carbon dioxide absorbed by the plant. The calculation unit 13 calculates the growth amount of the plant when a first carbon dioxide supply amount is supplied into the facility so that the carbon dioxide concentration inside the facility matches the carbon dioxide concentration in the atmosphere (first supply step). In this specification, supplying carbon dioxide such that the carbon dioxide concentration inside the facility matches the carbon dioxide concentration in the atmosphere is also referred to as zero concentration difference carbon dioxide application. In zero concentration difference carbon dioxide application, the carbon dioxide concentrations in the atmosphere and inside the facility match, so it can be assumed that there is no inflow or outflow of carbon dioxide inside or outside the facility.

[0024] In the first calculation step, the calculation unit 13 calculates the plant growth rate when zero-concentration difference carbon dioxide is applied based on the environmental conditions and biological conditions within the facility. Examples of environmental conditions within the facility include carbon dioxide concentration, temperature, solar radiation, humidity, and nutrient solution concentration. Examples of environmental conditions include a daily integrated value representing a daily integrated value and a daily average value. Examples of biological conditions include leaf area index, leaf length, leaf width, leaf number, plant height, weight, and fruit number. Examples of biological conditions include those measured at predetermined intervals. The calculation unit 13 may calculate the plant's dry matter production, calculated based on the plant's light use efficiency and the amount of light received, calculated from the environmental conditions and biological conditions, as the plant growth rate.

[0025] In a second calculation step, the calculation unit 13 calculates the total carbon dioxide absorption amount absorbed by the plant (first total carbon dioxide absorption amount) based on the growth amount calculated in the first calculation step. This first total carbon dioxide absorption amount refers to the total amount of carbon dioxide absorbed by the plant when carbon dioxide with a zero concentration difference is applied, and can be calculated from the growth amount calculated in the first calculation step using a conversion coefficient. The calculation unit 13 sends the total carbon dioxide absorption amount absorbed by the plant when carbon dioxide with a zero concentration difference is applied, calculated in this way, to the estimation unit 14.

[0026] Alternatively, the amount of plant growth and the amount of light received may be calculated for each carbon dioxide concentration in the facility, a regression equation may be created to determine the light use efficiency based on the carbon dioxide concentration, and the light use efficiency of the plants may be calculated using this regression equation.

[0027] 《High concentration carbon dioxide application》 The calculation unit 13 also calculates the amount of plant growth when a second amount of carbon dioxide is supplied into the facility so that the carbon dioxide concentration inside the facility becomes higher than the carbon dioxide concentration in the atmosphere (second supply step). In this specification, supplying carbon dioxide so that the carbon dioxide concentration inside the facility becomes higher than the carbon dioxide concentration in the atmosphere is also referred to as high-concentration carbon dioxide application.

[0028] In the third calculation step, the calculation unit 13 calculates the growth amount of the plant when high-concentration carbon dioxide is applied based on the environmental conditions and biological conditions in the facility. The calculation unit 13 may calculate, as the growth amount of the plant, the dry matter production amount of the plant calculated based on the light use efficiency of the plant and the amount of light received, which are calculated from the environmental conditions and biological conditions.

[0029] In a fourth calculation step, the calculation unit 13 calculates the total carbon dioxide absorption amount absorbed by the plant (second total carbon dioxide absorption amount) based on the growth amount calculated in the third calculation step. This second total carbon dioxide absorption amount refers to the total amount of carbon dioxide absorbed by the plant when high-concentration carbon dioxide is applied, and can be calculated from the growth amount calculated in the third calculation step using a conversion coefficient. The calculation unit 13 sends the total carbon dioxide absorption amount absorbed by the plant when high-concentration carbon dioxide is applied, calculated in this way, to the estimation unit 14.

[0030] <Estimation part 14> (: Zero concentration difference carbon dioxide application) In the first estimation step, the estimation unit 14 estimates the amount of carbon dioxide absorbed by the plant from the atmosphere when carbon dioxide with a zero concentration difference was applied (first carbon dioxide absorption amount). The estimation unit 14 estimates the first carbon dioxide absorption amount as a value obtained by subtracting the first carbon dioxide supply amount supplied into the facility when carbon dioxide with a zero concentration difference was applied from the first total carbon dioxide absorption amount calculated by the calculation unit 13. The estimation unit 14 sends the estimated first carbon dioxide absorption amount to the utilization efficiency estimation device 20.

[0031] 《High concentration carbon dioxide application》 The estimation unit 14 estimates the amount of carbon dioxide absorbed by the plant from the carbon dioxide supplied during the application of high-concentration carbon dioxide (second carbon dioxide absorption amount). In the second estimation step, the estimation unit 14 estimates the second carbon dioxide absorption amount as a value obtained by subtracting the first carbon dioxide absorption amount from the second total carbon dioxide absorption amount calculated by the calculation unit 13. The estimation unit 14 sends the estimated second carbon dioxide absorption amount to the utilization efficiency estimation device 20.

[0032] The first carbon dioxide absorption amount used by the estimation unit 14 to estimate the second carbon dioxide absorption amount may be calculated using a database that has been created in advance and stores environmental conditions and biological conditions in association with carbon dioxide supply amounts, or may be calculated using a relational expression that represents the relationship between environmental conditions and biological conditions and carbon dioxide supply amounts.

[0033] The absorption estimation method and absorption estimation device 10 can estimate the amount of carbon dioxide absorbed by plants separately into the amount absorbed from the atmosphere and the amount absorbed from supplied carbon dioxide. As a result, the absorption estimation method and absorption estimation device 10 can accurately estimate the amount of carbon dioxide absorbed by plants. As a result, the amount of carbon dioxide absorbed from the atmosphere can be compared with the amount of carbon dioxide absorbed from supplied carbon dioxide, and the carbon dioxide supply can be controlled taking into account the carbon dioxide utilization efficiency and the effect on plant growth. In this way, the absorption estimation method and absorption estimation device 10 can be used to realize control of the carbon dioxide supply taking into account the amount of carbon dioxide absorbed by plants.

[0034] (Estimation process when zero concentration difference carbon dioxide is applied) In a method for estimating a carbon dioxide absorption amount according to one embodiment of the present invention, the flow of an estimation process for estimating a first carbon dioxide absorption amount, which is the amount of carbon dioxide absorbed by a plant from the atmosphere when carbon dioxide with a zero concentration difference is applied, will be described with reference to Fig. 2. Fig. 2 is a flowchart showing one embodiment of the flow of the estimation process in the method for estimating a carbon dioxide absorption amount according to one embodiment of the present invention.

[0035] As shown in FIG. 2, first, the data acquisition unit 12 acquires the first carbon dioxide supply amount (SCe; g / m ) supplied into the facility during zero concentration difference carbon dioxide application. 2 ), environmental conditions and biological conditions within the facility are acquired (step S11). The amount of carbon dioxide supplied into the facility is intended to be the daily cumulative value of the amount of carbon dioxide supplied from a combustion-type carbon dioxide generator or a carbon dioxide cylinder. In the case of a combustion-type carbon dioxide generator, it can be calculated from the set concentration and operating time of the device, and in the case of a carbon dioxide cylinder, it can be calculated from the flow rate and operating time of the solenoid valve, as in the example described below. Next, the calculation unit 13 calculates the plant growth rate when carbon dioxide with zero concentration difference is applied based on the environmental conditions and biological conditions within the facility (step S12). The processing of step S12 can be executed as follows, as an example.

[0036] First, calculate the light utilization efficiency (LUE; g / MJ) based on Equation 1, which shows the relationship between the carbon dioxide concentration in the facility and light utilization efficiency (LUE): Light utilization efficiency LUE = a·ln(carbon dioxide concentration) + b (Equation 1) Instead of the calculation method using Equation 1, the light utilization efficiency (LUE) may be calculated by preparing a table in advance that shows the correspondence relationship between the carbon dioxide concentration and the light utilization efficiency (LUE).

[0037] Next, the amount of light received (IL; MJ / m) was calculated from the amount of solar radiation obtained as an environmental condition within the facility and the leaf area index (LAI) obtained as a biological condition. 2 Then, as shown in Equation 2, the light use efficiency (LUE) calculated by Equation 1 is multiplied by the amount of light received (IL) to obtain the dry matter production (TDMe; g / m 2 ) is calculated as follows: Dry matter production TDMe=LUE·IL (Equation 2) The dry matter production thus obtained is integrated for one day, and the resulting integrated daily dry matter production (TDMe) is used as the plant growth rate when carbon dioxide with zero concentration difference is applied.

[0038] Next, in step S13, the calculation unit 13 calculates the total amount of carbon dioxide absorbed by the plant when carbon dioxide with a zero concentration difference was applied, based on the growth rate of the plant. As an example, the processing of step S13 can be performed as follows.

[0039] That is, using Equation 3, the daily cumulative dry matter production (TDMe) calculated in step S12 is multiplied by a conversion factor (kcs: 1.47 (approximately 1 kg of sucrose is produced from 1.47 kg of carbon dioxide)) to obtain the daily cumulative carbon dioxide absorption (UCe; g / m 2 ) is calculated as follows: Daily accumulated carbon dioxide absorption UCe=TDMe·kcs (Equation 3) The obtained carbon dioxide uptake (UCe) is taken as the total carbon dioxide uptake absorbed by the plant when carbon dioxide was applied with zero concentration difference.

[0040] Then, in step S14, the estimation unit 14 estimates the first amount of carbon dioxide absorption derived from the atmosphere that the plant absorbed from the atmosphere by subtracting the first amount of carbon dioxide supply supplied into the facility when carbon dioxide with a zero concentration difference was applied from the first total amount of carbon dioxide absorption absorbed by the plant when carbon dioxide with a zero concentration difference was applied. Here, assuming that no carbon dioxide flows out of the facility when carbon dioxide with a zero concentration difference is applied, the first amount of carbon dioxide supply can be considered as the amount of absorption absorbed by the plant from the supplied carbon dioxide. The processing of step S14 can be executed, for example, as follows.

[0041] That is, using Equation 4, the first carbon dioxide supply amount (SCe) obtained in step S11 is subtracted from the carbon dioxide absorption amount (UCe) calculated in step S13 to obtain the first carbon dioxide absorption amount (UCee; g / m) derived from the atmosphere when carbon dioxide of zero concentration difference is applied. 2 ) and terminate the process: UCee = UCe - SCe (Equation 4) The estimated first carbon dioxide uptake (UCee) can be used to estimate the amount of carbon dioxide absorbed by a plant when high-concentration carbon dioxide is applied, and in a method for estimating carbon dioxide use efficiency, which will be described later.

[0042] (Estimated treatment when high-concentration carbon dioxide is applied) In a method for estimating a carbon dioxide absorption amount according to one embodiment of the present invention, the flow of an estimation process for estimating a second carbon dioxide absorption amount, which is the amount of carbon dioxide supplied during high-concentration carbon dioxide application, will be described with reference to FIG. 3. FIG. 3 is a flowchart showing another embodiment of the flow of the estimation process in a method for estimating a carbon dioxide absorption amount according to one embodiment of the present invention. As shown in FIG. 3, first, the data acquisition unit 12 acquires the second carbon dioxide supply amount supplied into the facility during high-concentration carbon dioxide application, the environmental conditions within the facility, and the biological conditions (step S21). Next, the calculation unit 13 calculates the growth amount of the plant during high-concentration carbon dioxide application based on the environmental conditions and biological conditions within the facility (step S22). The calculation method in step S22 is the same as in step S12.

[0043] Next, in step S23, the calculation unit 13 calculates the second total carbon dioxide absorption amount absorbed by the plant when high-concentration carbon dioxide is applied, based on the growth amount of the plant. The calculation method in step S23 is the same as in step S13.

[0044] Then, in step S24, the estimation unit 14 subtracts the first carbon dioxide supply amount estimated in step S14 from the second total carbon dioxide absorption amount absorbed by the plant when high-concentration carbon dioxide was applied. This estimates the second carbon dioxide absorption amount derived from the supply absorbed by the plant from the carbon dioxide supplied when high-concentration carbon dioxide was applied. The processing of step S24 can be executed, for example, as follows.

[0045] That is, using Equation 5, the second total carbon dioxide absorption amount (UCa; g / m 2 ) to obtain the carbon dioxide absorption amount (UCsa; g / m ) derived from the supply of high-concentration carbon dioxide by subtracting the first carbon dioxide absorption amount (UCee) estimated in step S14. 2 ) and terminate the process: UCsa = UCa - UCee (Equation 5) The first carbon dioxide absorption amount (UCee) may be calculated from a relational expression that expresses the relationship between the environmental conditions, biological conditions, and the carbon dioxide supply amount, which is converted into a function as described below, instead of the value estimated in step S14. The estimated carbon dioxide absorption amount (UCsa) derived from the supply when high-concentration carbon dioxide is applied can be used in the carbon dioxide utilization efficiency estimation method described below.

[0046] (Function of carbon dioxide supply when zero concentration difference carbon dioxide is applied) The calculation unit 13 may convert the relationship between the environmental conditions, biological conditions, and carbon dioxide supply amount when carbon dioxide with a zero concentration difference is applied into a function. In this way, by creating in advance a relational expression that represents the relationship between the environmental conditions, biological conditions, and carbon dioxide supply amount when carbon dioxide with a zero concentration difference is applied, the process of estimating the first carbon dioxide absorption amount can be omitted. In other words, the first carbon dioxide absorption amount can be obtained from the relational expression and used in the estimation of the second carbon dioxide absorption amount and the carbon dioxide utilization efficiency estimation method described below.

[0047] The function generation in the calculation unit 13 will be described with reference to Fig. 4. Fig. 4 is a graph showing the relationship between environmental conditions, biological conditions, and carbon dioxide supply amount used in a method for estimating carbon dioxide absorption amount according to one embodiment of the present invention.

[0048] The calculation unit 13 acquires and accumulates data on a plurality of different environmental conditions (e.g., solar radiation and temperature), biological conditions (leaf area index), and the amount of carbon dioxide supplied when carbon dioxide is applied with zero concentration difference, and converts the relationship between the environmental conditions, biological conditions, and the amount of carbon dioxide supplied into a function. Figure 4 is a graph showing the relationship between the environmental conditions, biological conditions, and the amount of carbon dioxide supplied obtained in this manner. Figure 4 is an example showing the relationship between daily integrated solar radiation and the amount of carbon dioxide supplied for each leaf area index (LAI).

[0049] Such a relationship, which has been converted into a function by the calculation unit 13, is stored in the storage device 50 as a relational expression or table, and is read out and used when used to estimate the amount of carbon dioxide absorption. For example, in the case of a tomato variety grown in a greenhouse shown in the examples described later, when the LAI is 1.0 to 4.0, there is a relationship shown in Figure 4 between the daily integrated carbon dioxide supply amount when carbon dioxide is applied with zero concentration difference and the daily integrated solar radiation amount in the greenhouse, and the following relational expression (I) is obtained: Daily accumulated carbon dioxide supply = a · Daily accumulated solar radiation - b (I) So for LAIs 1.0 to 4.0 respectively: When LAI = 4.0: a = 2.42, b = 0.49 When LAI = 3.0: a = 2.32, b = 0.49 When LAI = 2.0: a = 2.09, b = 0.49 When LAI = 1.0: a = 1.50, b = 0.49 In the above relational equation, since the temperature depends on the daily accumulated solar radiation, a regression equation is created here to calculate the daily accumulated carbon dioxide supply using the daily accumulated solar radiation and LAI, but this is not limited to this, and a multiple regression equation between the solar radiation and the temperature may also be used.

[0050] By using the above relational equation, even if the amount of carbon dioxide absorbed by a plant from the atmosphere when carbon dioxide with a zero concentration difference was not calculated, the amount of carbon dioxide absorbed under specific environmental and biological conditions can be determined.

[0051] [Method for estimating carbon dioxide utilization efficiency] A method for estimating carbon dioxide use efficiency according to one embodiment of the present invention will now be described with reference to Fig. 1. A use efficiency estimation device 20 shown in Fig. 1 is an information processing device that executes the method for estimating carbon dioxide use efficiency to estimate the carbon dioxide use efficiency of plants grown in a facility.

[0052] (Utilization efficiency estimation device 20) The use efficiency estimation device 20 estimates the carbon dioxide use efficiency within the facility. The use efficiency estimation device 20 estimates the carbon dioxide use efficiency within the facility using the carbon dioxide absorption amount estimated by the absorption amount estimation device 10. The use efficiency estimation device 20 estimates the carbon dioxide use efficiency by taking into account the carbon dioxide absorption amount, which is estimated by dividing it into the amount of carbon dioxide absorbed by plants from the atmosphere and the amount of carbon dioxide absorbed by plants from supplied carbon dioxide. The carbon dioxide use efficiency estimated by the use efficiency estimation device 20 is estimated by appropriately taking into account the amount of carbon dioxide absorbed by plants, and can be used to control the carbon dioxide supply amount.

[0053] The utilization efficiency estimation device 20 includes a control unit 21. The control unit 21 controls each unit of the utilization efficiency estimation device 20, and is realized by a processor and a memory, for example. In this example, the processor accesses a storage (not shown), loads a program (not shown) stored in the storage into the memory, and executes a series of instructions included in the program. This configures each unit of the control unit 21. As each unit, the control unit 21 includes a data acquisition unit 22, a calculation unit 23, and an estimation unit 24.

[0054] <Data Acquisition Unit 22> The data acquisition unit 22 receives input data input by a user. The data acquisition unit 22 acquires the first carbon dioxide absorption amount and the second carbon dioxide absorption amount estimated by the absorption amount estimation device 10. The data acquisition unit 22 sends the acquired data to the calculation unit 23 and the estimation unit 24.

[0055] <Calculation unit 23> The calculation unit 23 calculates the amount of plant growth derived from the atmosphere when carbon dioxide with a zero concentration difference is applied, from the first amount of carbon dioxide absorption estimated by the absorption estimation device 10. The calculation unit 23 also calculates the amount of plant growth derived from the supply when carbon dioxide with a high concentration is applied, from the second amount of carbon dioxide absorption estimated by the absorption estimation device 10. The calculation unit 23 also calculates the amount of plant growth derived from the supply when carbon dioxide with a zero concentration difference is applied, from the amount of plant growth derived from the atmosphere when carbon dioxide with a zero concentration difference is applied and the amount of plant growth derived from the atmosphere when carbon dioxide with a zero concentration difference is applied. The calculation unit 23 sends the calculated amount of plant growth derived from the atmosphere and the amount of plant growth derived from the supply when carbon dioxide with a zero concentration difference is applied, as well as the calculated amount of plant growth derived from the supply when carbon dioxide with a high concentration is applied, to the estimation unit 24.

[0056] <Estimation part 24> The estimation unit 24 estimates the carbon dioxide use efficiency based on at least one of the first carbon dioxide absorption amount and the second carbon dioxide absorption amount estimated by the absorption amount estimation device 10. As an example, the estimation unit 24 can estimate the absorption efficiency of carbon dioxide supplied during high-concentration carbon dioxide application based on the second carbon dioxide absorption amount and the second carbon dioxide supply amount. Furthermore, the estimation unit 24 can estimate the proportion of carbon dioxide supplied into the facility that flows out of the facility based on the second carbon dioxide absorption amount and the second carbon dioxide supply amount. This makes it possible to estimate the carbon dioxide use efficiency relative to plant absorption, which indicates whether the carbon dioxide supplied into the facility is being appropriately used.

[0057] The estimation unit 24 estimates the carbon dioxide use efficiency within the facility from at least one of the plant growth rate derived from the atmosphere when carbon dioxide with a zero concentration difference is applied and the plant growth rate derived from the supply when carbon dioxide with a high concentration is applied. As an example, the estimation unit 24 can estimate the plant growth rate resulting from carbon dioxide supplied within the facility based on the plant growth rate derived from the supply when carbon dioxide with a high concentration is applied and the second carbon dioxide supply rate. Furthermore, the estimation unit 24 can estimate the plant growth rate resulting from carbon dioxide application relative to the case where carbon dioxide is only supplied from the atmosphere based on the plant growth rate derived from the atmosphere when carbon dioxide with a zero concentration difference is applied and the plant growth rate derived from the supply when carbon dioxide with a zero concentration difference is applied. This makes it possible to estimate the carbon dioxide use efficiency for plant growth, which indicates whether the carbon dioxide supplied within the facility is sufficiently contributing to plant production.

[0058] (Estimation of absorption efficiency of carbon dioxide supplied during high-concentration carbon dioxide application) In a method for estimating carbon dioxide use efficiency according to one embodiment of the present invention, the flow of an estimation process for estimating the absorption efficiency of carbon dioxide supplied during application of high-concentration carbon dioxide will be described with reference to Fig. 5. Fig. 5 is a flowchart showing one embodiment of the flow of the estimation process for carbon dioxide absorption efficiency in the method for estimating carbon dioxide use efficiency according to one embodiment of the present invention.

[0059] As shown in FIG. 5, first, the data acquisition unit 22 acquires from the absorption amount estimation device 10 the second carbon dioxide absorption amount derived from the supply absorbed by the plant from the supplied carbon dioxide when high-concentration carbon dioxide is applied, and the second carbon dioxide supply amount supplied into the facility when high-concentration carbon dioxide is applied (step S31).

[0060] Next, in step S32, the estimation unit 24 estimates the absorption efficiency of carbon dioxide supplied during high-concentration carbon dioxide application by dividing the second carbon dioxide absorption amount by the second carbon dioxide supply amount. As an example, the processing of step 32 can be performed as follows.

[0061] That is, using Equation 6, the second carbon dioxide absorption amount (UCsa) is divided by the second carbon dioxide supply amount (SCa) to calculate the absorption efficiency of the carbon dioxide supplied during the high-concentration carbon dioxide application, and the process is terminated: Absorption efficiency for carbon dioxide from the supply = UCsa / SCa (Equation 6) The estimated absorption efficiency of carbon dioxide from the supply can be used as an indicator to determine whether the supplied carbon dioxide is sufficiently absorbed by the plants or whether it is not absorbed and is wasted, and can be used to control the amount of carbon dioxide supplied to the facility.

[0062] (Estimation of the proportion of carbon dioxide supplied to the facility that escapes outside the facility) In a method for estimating carbon dioxide use efficiency according to an embodiment of the present invention, the flow of a process for estimating the outflow rate of carbon dioxide supplied into a facility to the outside of the facility will be described with reference to Fig. 6. Fig. 6 is a flowchart showing one embodiment of the flow of a process for estimating the outflow rate of carbon dioxide in a method for estimating carbon dioxide use efficiency according to an embodiment of the present invention.

[0063] 6, first, the data acquisition unit 22 acquires the second carbon dioxide absorption amount derived from the supply during high-concentration carbon dioxide application and the second carbon dioxide supply amount supplied into the facility during high-concentration carbon dioxide application from the absorption amount estimation device 10 (step S41). Next, in step S42, the calculation unit 23 subtracts the second carbon dioxide absorption amount derived from the supply from the second carbon dioxide supply amount to calculate the amount of carbon dioxide flowing in and out between the atmosphere and the facility. The processing of step 42 can be executed, for example, as follows.

[0064] That is, using Equation 7, the second carbon dioxide absorption amount (UCsa) is subtracted from the second carbon dioxide supply amount (SCa) to obtain the amount of carbon dioxide inflow and outflow (LC; g / m) between the atmosphere and the facility. 2 ) is calculated as follows: LC = SCa - UCsa (Equation 7) Then, in step S43, the estimation unit 24 divides the amount of carbon dioxide flowing in and out between the atmosphere and the facility by the second amount of carbon dioxide supplied to estimate the proportion of the carbon dioxide that is flowing out of the outside air to the supplied carbon dioxide. As an example, the processing of step S43 can be executed as follows.

[0065] That is, using Equation 8, LC calculated in step S42 is divided by SCa to estimate the proportion of outside air outflow in the supplied carbon dioxide, and the process ends: The ratio of the carbon dioxide supplied to the outside air = LC / SCa (Equation 8) The estimated ratio of outside air outflow to the supplied carbon dioxide can be used as an indicator to determine whether the supplied carbon dioxide is leaking outside the facility without being absorbed by plants, and can be used to control the amount of carbon dioxide supplied into the facility.

[0066] (Estimation of plant growth rate due to carbon dioxide supplied to the facility) In a method for estimating carbon dioxide use efficiency according to one embodiment of the present invention, the flow of a process for estimating a plant's growth rate due to carbon dioxide supplied into a facility will be described with reference to Fig. 7. Fig. 7 is a flowchart showing one embodiment of the flow of a process for estimating a plant's growth rate due to carbon dioxide in a method for estimating carbon dioxide use efficiency according to one embodiment of the present invention.

[0067] 7, first, the data acquisition unit 22 acquires the second carbon dioxide absorption amount derived from the supply during high-concentration carbon dioxide application and the second carbon dioxide supply amount supplied into the facility during high-concentration carbon dioxide application (step S51). Next, in step S52, the calculation unit 23 calculates the supply-derived plant growth amount, which is the amount of plant growth from the carbon dioxide supplied during high-concentration carbon dioxide application, from the second carbon dioxide absorption amount. The processing of step S52 can be executed, for example, as follows.

[0068] That is, using Equation 9, the second carbon dioxide absorption amount (UCsa) is divided by kcs (conversion factor) to obtain the dry matter production (TDMsa; g / m) derived from the supply of high-concentration carbon dioxide.2 ) is calculated as follows: TDMsa=UCsa / kcs (Equation 9) Then, in step S53, the estimation unit 24 divides the growth rate of the plants derived from the supply by the second amount of carbon dioxide supplied into the facility during high-concentration carbon dioxide application to estimate the growth rate of the plants due to the supplied carbon dioxide. As an example, the processing of step S53 can be executed as follows.

[0069] That is, using Equation 10, the TDMsa calculated in step S52 is divided by the second carbon dioxide supply amount (SCa) to estimate the dry matter production rate due to the supplied carbon dioxide, and the process ends: Dry matter production rate relative to supplied carbon dioxide = TDMsa / SCa (Equation 10) The estimated plant growth rate due to the supplied carbon dioxide can be used as an indicator to determine whether the supplied carbon dioxide is contributing to plant growth, and can be used to control the amount of carbon dioxide supplied to the facility.

[0070] (Estimation of plant growth rates due to atmospheric carbon dioxide) The flow of processing for estimating the growth rate of a plant due to atmospheric carbon dioxide in a method for estimating carbon dioxide use efficiency according to an embodiment of the present invention will be described with reference to Fig. 8. Fig. 8 is a flowchart showing one embodiment of the flow of processing for estimating the growth rate of a plant due to carbon dioxide in a method for estimating carbon dioxide use efficiency according to an embodiment of the present invention.

[0071] As shown in Fig. 8, first, the data acquisition unit 22 acquires a first amount of carbon dioxide absorption derived from the atmosphere when carbon dioxide with a zero concentration difference is applied, and the amount of plant growth when carbon dioxide with a zero concentration difference is applied (step S61). The amount of plant growth when carbon dioxide with a zero concentration difference is applied may be the value calculated in step S12. Next, in step S62, the calculation unit 23 calculates the amount of plant growth derived from the atmosphere, which is the growth of the plant from carbon dioxide absorbed from the atmosphere when carbon dioxide with a zero concentration difference is applied, from the first amount of carbon dioxide absorption. The processing of step S62 can be executed, for example, as follows.

[0072] That is, using Equation 11, the first carbon dioxide absorption amount (UCee) was divided by kcs (conversion factor) to obtain the air-derived dry matter production (TDMee; g / m) when zero concentration difference carbon dioxide was applied. 2 ) is calculated as follows: TDMee=UCee / kcs (Equation 11) Next, in step S63, the calculation unit 23 calculates the supply-derived growth amount of the plant that grew from the carbon dioxide supplied when carbon dioxide with a zero concentration difference was applied by subtracting the atmospheric-derived growth amount of the plant from the growth amount of the plant when carbon dioxide with a zero concentration difference was applied. As an example, the processing of step S63 can be executed as follows.

[0073] That is, using Equation 12, the TDMee calculated in step S62 is subtracted from the daily cumulative dry matter production (TDMe) calculated in step S12 to obtain the dry matter production (TDMse; g / m) derived from the supply of carbon dioxide with zero concentration difference. 2 ) is calculated as follows: TDMse = TDMe - TDMee (Equation 12) Then, in step S64, the estimation unit 24 divides the growth rate derived from the supply when carbon dioxide with a zero concentration difference is applied by the growth rate derived from the atmosphere when carbon dioxide with a zero concentration difference is applied to estimate the plant growth rate due to carbon dioxide in the atmosphere. As an example, the processing of step S64 can be executed as follows.

[0074] That is, using Equation 13, the supply-derived dry matter production (TDMse) calculated in step S63 is divided by the atmospheric-derived dry matter production (TDMee) calculated in step S62 to estimate the dry matter production rate with carbon dioxide application relative to the case of only carbon dioxide from the atmosphere, and the process ends: Dry matter production rate with carbon dioxide application compared to atmospheric carbon dioxide alone = TDMse / TDMee (Equation 13).

[0075] [Software implementation example] The functions of the absorption amount estimation device 10 and the utilization efficiency estimation device 20 (hereinafter referred to as the "devices") can be realized by a program that causes a computer to function as the devices, and a program that causes a computer to function as each control block of the devices (particularly each part included in the control unit 11 and the control unit 21).

[0076] In this case, the device includes a computer having at least one control device (e.g., a processor) and at least one storage device (e.g., a memory) as hardware for executing the program. The control device and storage device execute the program, thereby realizing the functions described in each of the above embodiments.

[0077] The program may be non-transitory and may be recorded on one or more computer-readable recording media. The recording media may or may not be included in the device. In the latter case, the program may be supplied to the device via any wired or wireless transmission medium.

[0078] Furthermore, some or all of the functions of the control blocks can be realized by logic circuits. For example, integrated circuits in which logic circuits functioning as the control blocks are formed are also included in the scope of the present invention. In addition, the functions of the control blocks can also be realized by, for example, a quantum computer.

[0079] Furthermore, each process described in each of the above embodiments may be executed by AI (Artificial Intelligence). In this case, the AI ​​may run on the control device or on another device (for example, an edge computer or a cloud server).

[0080] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Example]

[0081] Example 1: Tomato A test was conducted in a facility where tomatoes are grown, using a method according to one embodiment of the present invention to estimate the amount of carbon dioxide absorbed and the efficiency of carbon dioxide use. The test was conducted in Tsukuba City, Ibaraki Prefecture, and the test crop was tomato. Zero concentration difference carbon dioxide application (November 9th) and high concentration carbon dioxide application (November 2nd) were conducted on different days. The carbon dioxide concentration in the greenhouse was set under the following conditions.

[0082] (Setting carbon dioxide concentration) When high-concentration carbon dioxide was applied, from sunrise to sunset, if the carbon dioxide concentration in the greenhouse fell below 450 ppm, carbon dioxide was applied for 5 seconds, with application paused for 55 seconds, and this was repeated. When zero-concentration carbon dioxide was applied, from sunrise to sunset, if the carbon dioxide concentration in the greenhouse fell below 380 ppm, carbon dioxide was applied for 5 seconds, with application paused for 55 seconds, and this was repeated. The amount of carbon dioxide applied was recorded by recording the ON and OFF of the CO2 solenoid valve with a data logger, and the amount of carbon dioxide applied per second (g / m 2 ) was measured separately and calculated as the total application amount by multiplying the application time (seconds) by the amount of carbon dioxide applied per second.

[0083] Table 1 shows the measured and calculated values ​​of each parameter in Example 1. [Table 1]

[0084] (Zero concentration difference carbon dioxide application) <Carbon dioxide supply measurement (1)> The daily cumulative value of carbon dioxide supply when zero concentration difference carbon dioxide was applied (SCe) was measured at 10.8.

[0085] <Measurement of environmental and biological conditions every 5 minutes (2)> As the environmental conditions, in FIG. 9, the carbon dioxide concentration (ppm) in the greenhouse shown in graph 1001, the temperature (°C) in the greenhouse shown in graph 1002, and the amount of solar radiation (MJ / m 2 The leaf area index (LAIe) was measured as a biological condition.

[0086] <Calculation of growth amount (3)> The light utilization efficiency (LUEe) was calculated using Equation 1-1 (described below), which is obtained by substituting coefficients a = 1.4 and b = -5.1 into Equation 1. The light utilization efficiency and amount of received light were calculated every 5 minutes.

[0087] Table 2 shows the carbon dioxide concentration, light utilization efficiency, and amount of light received every 5 minutes when carbon dioxide was applied with zero concentration difference. [Table 2]

[0088] From Table 2, the carbon dioxide concentration from 8:00 to 8:05 is 445.0 ppm, so from Equation 1-1, LUEe=1.4·ln(445.0)-5.1=3.4 The carbon dioxide concentration from 8:00 to 8:05 is 443.4 ppm, so similarly, from equation 1-1, LUEe=1.4·ln(443.4)-5.1=3.4

[0089] In addition, the dry matter production was calculated from the light use efficiency (LUEe) and the amount of light received (ILe) every 5 minutes using the above-mentioned Equation 2. From Table 2, the light use efficiency from 8:00 to 8:05 was 3.4 g / MJ, and the amount of light received was 0.017 (MJ / m 2 ), so according to the above formula 2, the dry matter production is 0.059 (g / m 2 Next, the light utilization efficiency from 8:05 to 8:10 is 3.4 (g / MJ), and the amount of light received is 0.025 (MJ / m 2), so according to the above formula 2, the dry matter production in 5 minutes is 0.085 (g / m 2 ) These were added up for one day to calculate the daily cumulative dry matter production (TDMe) = 8.7.

[0090] In this example, the dry matter production was calculated every 5 minutes, but the dry matter production may be calculated at any time interval, such as every minute, every 10 minutes, or every 30 minutes, and integrated for one day to determine the daily integrated dry matter production (TDMe). Furthermore, when the change in carbon dioxide concentration is small, the daily average light use efficiency may be calculated using Equation 1-1 based on the average carbon dioxide during the day, and the daily integrated amount of received light and the daily average light use efficiency calculated from the daily integrated amount of solar radiation may be substituted into Equation 2 to determine the daily integrated dry matter production (TDMe).

[0091] Using the daily cumulative dry matter production (TDMe) of 8.7 obtained from equation 2 and the conversion factor (kcs) of 1.47, the daily cumulative carbon dioxide absorption (UCe) of 12.8 was calculated from equation 3 above.

[0092] <Calculation of atmospheric carbon dioxide absorption and dry matter production (4)> Using the daily cumulative carbon dioxide absorption (UCe) of 12.8 obtained from Equation 3 and the daily cumulative carbon dioxide supply (SCe) of 10.8, the atmospheric carbon dioxide absorption (UCee) of 2.0 was calculated using Equation 4.

[0093] The measured daily cumulative carbon dioxide supply (SCe) was considered to be the carbon dioxide absorption from the supply when carbon dioxide was applied at zero concentration difference (UCse) = 10.8.

[0094] Using the atmospheric carbon dioxide absorption (UCee) of 2.0 and the conversion coefficient (kcs) of 1.47, the atmospheric dry matter production (TDMee) of 1.3 when zero concentration difference carbon dioxide was applied was calculated using the above-mentioned equation 11.

[0095] Using the daily cumulative dry matter production (TDMe) = 8.7 and the atmospheric dry matter production (TDMee) = 1.3 when carbon dioxide with a zero concentration difference was applied, the supply-derived dry matter production (TDMse) = 7.4 when carbon dioxide with a zero concentration difference was calculated using the above-mentioned equation 12.

[0096] (High concentration carbon dioxide application) <Carbon dioxide supply measurement (1)> The daily cumulative value of carbon dioxide supply during high-concentration carbon dioxide application (SCa) was measured at 32.5.

[0097] <Measurement of environmental and biological conditions every 5 minutes (2)> As the environmental conditions, in FIG. 9, the carbon dioxide concentration (ppm) in the greenhouse shown in graph 1001, the temperature (°C) in the greenhouse shown in graph 1002, and the amount of solar radiation (MJ / m 2 The leaf area index (LAIa) was measured as a biological condition of 3.0.

[0098] <Calculation of growth amount (3)> The light utilization efficiency (LUEa) was calculated using Equation 1-2, which was obtained by substituting coefficients a = 1.4 and b = -5.1 into Equation 1. The light utilization efficiency and amount of received light were calculated every 5 minutes.

[0099] Table 3 shows the carbon dioxide concentration, light utilization efficiency, and amount of light received every 5 minutes when high-concentration carbon dioxide was applied. [Table 3]

[0100] From Table 3, the carbon dioxide concentration from 8:00 to 8:05 is 469.6 ppm, so from Equation 1-1, LUEe = 1.4 ln(469.6) - 5.1 = 3.5 (Equation 1-1) The carbon dioxide concentration from 8:00 to 8:05 is 469.8 (ppm), so similarly, from equation 1-1, LUEe=1.4·ln(469.8)-5.1=3.5 In addition, dry matter production was calculated from the light use efficiency (LUEe) and the amount of light received (ILe) every 5 minutes using the above-mentioned formula 2.

[0101] From Table 3, the light utilization efficiency from 8:00 to 8:05 was 3.5, and the amount of light received was 0.010 (MJ / m 2 ), so according to the above formula 2, the dry matter production is 0.037 (g / m 2 Next, the light utilization efficiency from 8:05 to 8:10 is 3.5 (g / MJ), and the amount of light received is 0.011 (MJ / m 2 ), so according to the above formula 2, the dry matter production is 0.040 (g / m 2 ) These were added up for one day to calculate the daily accumulated dry matter production (TDMa) = 9.0. In this example, the dry matter production was calculated every 5 minutes, but the dry matter production may be calculated at any time interval, such as every minute, every 10 minutes, or every 30 minutes, and integrated for one day to determine the daily integrated dry matter production (TDMe). Furthermore, when the change in carbon dioxide concentration is small, the daily average light use efficiency may be calculated using Equation 1-1 based on the average carbon dioxide during the day, and the daily integrated amount of received light and the daily average light use efficiency calculated from the daily integrated amount of solar radiation may be substituted into Equation 2 to determine the daily integrated dry matter production (TDMe).

[0102] Using the daily cumulative dry matter production (TDMa) of 9.0 obtained from equation 2 and the conversion factor (kcs) of 1.47, the daily cumulative carbon dioxide absorption (UCa) of 13.2 was calculated from equation 3 above.

[0103] <Calculation of absorption and dry matter production when high-concentration carbon dioxide is applied (4)> Based on the measured environmental conditions, biological conditions, and carbon dioxide supply amount when carbon dioxide was supplied at zero concentration difference, the light use efficiency (LUEa) and carbon dioxide supply amount (SCa) under the environmental conditions and biological conditions at the time when the daily accumulated carbon dioxide supply amount was measured when high concentration carbon dioxide was applied were calculated.

[0104] As shown in Table 4, the temperature inside the greenhouse when measuring the daily integrated carbon dioxide supply (SCa) during high-concentration carbon dioxide application was 25.6°C, and the solar radiation inside the greenhouse was 5.6 MJ / m2 / d, leaf area index is 3.0m 2 / m 2 In this example, the conditions that most closely matched the conditions were extracted from a database of temperature, solar radiation, and leaf area records. As a result, the temperature inside the greenhouse on November 9 (25.6°C) and the amount of solar radiation inside the greenhouse (5.6 MJ / m 2 / d) and leaf area index (3.0) were the most similar conditions, so we used the light use efficiency (LUEe) and carbon dioxide supply (SCe) under zero concentration difference carbon dioxide application under these conditions.

[0105] Table 4 is the record database when zero concentration difference carbon dioxide was applied. [Table 4]

[0106] By substituting the data from November 9th, which had the closest temperature, solar radiation, and leaf area index conditions to those at the time of SCa measurement, into equations 1 to 4 above, we calculated the amount of carbon dioxide absorbed from the atmosphere (UCee) = 2.0.

[0107] In this example, the light utilization efficiency during high-concentration carbon dioxide application was calculated later, so data measured after the high-concentration carbon dioxide application date was available. By calculating in this way, it was possible to improve the accuracy of the application efficiency.

[0108] Although this example shows an example using a record database of actual zero-concentration difference carbon dioxide application, the carbon dioxide absorption amount when zero-concentration difference carbon dioxide is applied can also be calculated using a relational expression that expresses the relationship between environmental conditions, biological conditions, and the carbon dioxide supply amount. That is, when the daily integrated carbon dioxide supply amount (SCa) was measured (November 2nd) when high-concentration carbon dioxide was applied, the solar radiation in the greenhouse was 5.6 MJ / m 2By substituting / d into the above-mentioned formula I, the daily integrated carbon dioxide supply (SCa) = 12.5 is calculated. From this, the atmospheric carbon dioxide absorption (UCee) can also be calculated. However, in this example, the atmospheric carbon dioxide absorption (UCee) = 2.0 obtained from the actual measurement data on November 9 was used in the subsequent calculations.

[0109] <Calculation of CO2 absorption from supply, dry matter production, and output (7)> Using the daily cumulative carbon dioxide absorption (UCa) of 13.2 obtained from equation 3 and the carbon dioxide absorption from the atmosphere (UCee) of 2.0, the carbon dioxide absorption from the supply during high-concentration carbon dioxide application (UCsa) of 11.3 was calculated from equation 5 above.

[0110] Next, using the supply-derived carbon dioxide absorption amount (UCsa) = 11.3 and the conversion factor (kcs) = 1.47, the supply-derived dry matter production amount (TDMsa) = 7.7 when high-concentration carbon dioxide was applied was calculated using the above-mentioned equation 9.

[0111] Using the measured daily cumulative carbon dioxide supply (SCa) = 32.5 and the calculated carbon dioxide absorption from supply (UCsa) = 11.3, the carbon dioxide inflow / outflow between the atmosphere and the facility (LC) = 21.2 was calculated using the above equation 7.

[0112] <Calculation of carbon dioxide application efficiency: Efficiency for crop production> Using the dry matter production derived from the supply when high-concentration carbon dioxide was applied (TDMsa) = 7.7 and the measured daily accumulated carbon dioxide supply (SCa) = 32.5, the dry matter production rate relative to the supplied carbon dioxide was calculated as 0.24 using equation 10.

[0113] In addition, using the dry matter production derived from the supply when carbon dioxide with zero concentration difference was applied (TDMse) = 7.4 and the dry matter production derived from the atmosphere when carbon dioxide with zero concentration difference was applied (TDMee) = 1.3, the dry matter production efficiency of carbon dioxide application compared to the case of only carbon dioxide from the atmosphere was calculated as 5.6 from the above-mentioned equation 13.

[0114] <Calculation of carbon dioxide application efficiency: Efficiency for CO2 absorption> Using the carbon dioxide absorption amount (UCsa) of 11.3 when high-concentration carbon dioxide was applied and the measured daily cumulative carbon dioxide supply amount (SCa) of 32.5, the absorption efficiency of 0.35 for carbon dioxide supplied when high-concentration carbon dioxide was applied was calculated using the above-mentioned equation 6.

[0115] Using the carbon dioxide inflow / outflow rate between the atmosphere and the facility (LC) = 21.2 and the measured daily cumulative carbon dioxide supply (SCa) = 32.5, the ratio of outside air outflow to the supplied carbon dioxide = 0·65 was calculated using the above-mentioned equation 8.

[0116] In this way, the estimation method of the present invention made it possible to estimate the amount of carbon dioxide absorbed by plants and the carbon dioxide utilization efficiency.

[0117] Example 2: Bell peppers A test was conducted in a facility where bell peppers are grown, using a method according to one embodiment of the present invention to estimate the amount of carbon dioxide absorbed and the efficiency of carbon dioxide use. The test was conducted in Tsukuba City, Ibaraki Prefecture, and the test crop was bell peppers. Zero concentration difference carbon dioxide application (November 28th) and high concentration carbon dioxide application (November 30th) were conducted on different days. The carbon dioxide concentration in the greenhouse was set under the following conditions.

[0118] (Setting carbon dioxide concentration) When high-concentration carbon dioxide was applied, from sunrise to sunset, if the window was closed, carbon dioxide was applied for 5 seconds when the carbon dioxide concentration in the greenhouse fell below 700 ppm, with application paused for 55 seconds, repeated. Also, if the window was open, carbon dioxide was applied for 5 seconds when the carbon dioxide concentration in the greenhouse fell below 400 ppm, with application paused for 55 seconds, repeated. When zero-concentration difference carbon dioxide was applied, from sunrise to sunset, if the carbon dioxide concentration in the greenhouse fell below 400 ppm, carbon dioxide was applied for 5 seconds when the carbon dioxide concentration fell below 400 ppm, with application paused for 55 seconds, repeated. The amount of carbon dioxide applied was recorded by recording the ON and OFF of the CO2 solenoid valve with a data logger, and the amount of carbon dioxide applied per second (g / m 2) was measured separately and calculated as the total application amount by multiplying the application time (seconds) by the amount of carbon dioxide applied per second.

[0119] Table 5 shows the measured and calculated values ​​of each parameter in Example 2. [Table 5]

[0120] (Zero concentration difference carbon dioxide application) <Carbon dioxide supply measurement (1)> The daily cumulative value (SCe) of carbon dioxide supply when zero concentration difference carbon dioxide was applied was measured.

[0121] <Measurement of environmental and biological conditions every 5 minutes (2)> As the environmental conditions, in FIG. 10, the carbon dioxide concentration (ppm) in the greenhouse shown in graph 1004, the temperature (°C) in the greenhouse shown in graph 1005, and the amount of solar radiation (MJ / m 2 The leaf area index (LAIe) was measured as a biological condition.

[0122] <Calculation of growth amount (3)> The light utilization efficiency (LUEe) was calculated using Equation 1-1, which was obtained by substituting coefficients a = 1.4 and b = -5.1 into Equation 1. The light utilization efficiency and amount of received light were calculated every 5 minutes.

[0123] Table 6 shows the carbon dioxide concentration, light utilization efficiency, and amount of light received every 5 minutes when carbon dioxide was applied with zero concentration difference. [Table 6]

[0124] From Table 6, the carbon dioxide concentration from 8:00 to 8:05 is 532.6 (ppm), so from Equation 1-1, LUEe = 1.4 ln(532.6) - 5.1 = 3.7 (Equation 1-17) The carbon dioxide concentration from 8:00 to 8:05 is 526.8 ppm, so similarly, from equation 1-1, LUEe=1.4·ln(526.8)-5.1=3.7 In addition, dry matter production was calculated from the light use efficiency (LUEe) and the amount of light received (ILe) every 5 minutes using the above-mentioned formula 2.

[0125] From Table 6, the light utilization efficiency from 8:00 to 8:05 was 3.7, and the amount of light received was 0.004 (MJ / m 2 ), so according to the above formula 2, the dry matter production is 0.013 (g / m 2 Next, the light utilization efficiency from 8:05 to 8:10 is 3.7 (g / MJ), and the amount of light received is 0.005 (MJ / m 2 ), so according to the above formula 2, the dry matter production is 0.017 (g / m 2 ) These were added up for one day to calculate the daily accumulated dry matter production (TDMa) = 7.3.

[0126] In this example, the dry matter production was calculated every 5 minutes, but the dry matter production may be calculated at any time interval, such as every minute, every 10 minutes, or every 30 minutes, and integrated for one day to determine the daily integrated dry matter production (TDMe). Furthermore, when the change in carbon dioxide concentration is small, the daily average light use efficiency may be calculated using Equation 1-1 based on the average carbon dioxide during the day, and the daily integrated amount of received light and the daily average light use efficiency calculated from the daily integrated amount of solar radiation may be substituted into Equation 2 to determine the daily integrated dry matter production (TDMe).

[0127] Using the daily cumulative dry matter production (TDMe) of 7.3 obtained from equation 2 and the conversion factor (kcs) of 1.47, the daily cumulative carbon dioxide absorption (UCe) of 10.8 was calculated from equation 3 above.

[0128] <Calculation of atmospheric carbon dioxide absorption and dry matter production (4)> Using the daily cumulative carbon dioxide absorption (UCe) of 10.8 obtained from Equation 3 and the daily cumulative carbon dioxide supply (SCe) of 10.6, the atmospheric carbon dioxide absorption (UCee) of 0.3 was calculated from Equation 4.

[0129] The measured daily cumulative carbon dioxide supply (SCe) was considered to be the carbon dioxide absorption from the supply when carbon dioxide was applied at zero concentration difference (UCse) = 10.6.

[0130] Using the atmospheric carbon dioxide absorption (UCee) = 0.3 and the conversion coefficient (kcs) = 1.47, the atmospheric dry matter production (TDMee) = 0.2 when zero concentration difference carbon dioxide was applied was calculated using the above-mentioned equation 11.

[0131] Using the daily cumulative dry matter production (TDMe) = 7.3 and the atmospheric dry matter production (TDMee) = 0.2 when carbon dioxide with a zero concentration difference was applied, the supply-derived dry matter production (TDMse) = 7.1 when carbon dioxide with a zero concentration difference was calculated using the above-mentioned equation 12.

[0132] (High concentration carbon dioxide application) <Carbon dioxide supply measurement (1)> The daily cumulative value of carbon dioxide supply during high-concentration carbon dioxide application (SCa) was measured at 15.8.

[0133] <Measurement of environmental and biological conditions every 5 minutes (2)> As the environmental conditions, in FIG. 10, the carbon dioxide concentration (ppm) in the greenhouse shown in graph 1004, the temperature (°C) in the greenhouse shown in graph 1005, and the amount of solar radiation (MJ / m 2 The leaf area index (LAIa) was measured as a biological condition.

[0134] <Calculation of growth amount (3)> The light utilization efficiency (LUEa) was calculated using Equation 1-4, which was obtained by substituting coefficients a = 1.4 and b = -5.1 into Equation 1. The light utilization efficiency and amount of received light were calculated every 5 minutes. Table 7 shows the carbon dioxide concentration, light utilization efficiency, and amount of light received every 5 minutes when high-concentration carbon dioxide was applied. [Table 7]

[0135] From Table 7, the carbon dioxide concentration from 8:00 to 8:05 is 737.8 ppm, so from Equation 1-1, LUEe=1.4·ln(737.8)-5.1=4.1 (Equation 1-17) The carbon dioxide concentration from 8:00 to 8:05 is 731.0 (ppm), so similarly, from equation 1-1, LUEe=1.4·ln(731.0)-5.1=4.1 In addition, dry matter production was calculated from the light use efficiency (LUEe) and the amount of light received (ILe) every 5 minutes using the above-mentioned formula 2.

[0136] From Table 7, the light utilization efficiency from 8:00 to 8:05 was 4.1 (g / MJ), and the amount of light received was 0.013 (MJ / m 2 ), so according to the above formula 2, the dry matter production is 0.054 (g / m 2 Next, the light utilization efficiency from 8:05 to 8:10 is 4.1 (g / MJ), and the amount of light received is 0.014 (MJ / m 2 ), so according to the above formula 2, the dry matter production is 0.058 (g / m 2 ) These were added up for one day to calculate the daily accumulated dry matter production (TDMa) = 8.6.

[0137] In this example, the dry matter production was calculated every 5 minutes, but the dry matter production may be calculated at any time interval, such as every minute, every 10 minutes, or every 30 minutes, and integrated for one day to determine the daily integrated dry matter production (TDMe). Furthermore, when the change in carbon dioxide concentration is small, the daily average light use efficiency may be calculated using Equation 1-1 based on the average carbon dioxide during the day, and the daily integrated amount of received light and the daily average light use efficiency calculated from the daily integrated amount of solar radiation may be substituted into Equation 2 to determine the daily integrated dry matter production (TDMe).

[0138] Using the daily cumulative dry matter production (TDMa) of 8.6 obtained from equation 2 and the conversion factor (kcs) of 1.47, the daily cumulative carbon dioxide absorption (UCa) of 12.7 was calculated using equation 3 above.

[0139] <Calculation of absorption and dry matter production when high-concentration carbon dioxide is applied (4)> Based on the measured environmental conditions, biological conditions, and first carbon dioxide absorption amount when carbon dioxide was supplied at zero concentration difference, the light utilization efficiency (LUEa) and carbon dioxide supply amount (SCa) under the environmental conditions and biological conditions at the time when the daily cumulative carbon dioxide supply amount was measured when high concentration carbon dioxide was applied were calculated.

[0140] When the daily cumulative carbon dioxide supply (SCa) was measured (November 30th), the temperature inside the greenhouse was 27.2°C and the amount of solar radiation inside the greenhouse was 4.5MJ / m 2 / d, leaf area 2.5m 2 / m 2 In this example, the conditions that most closely matched the conditions were extracted from a database of records of temperature, solar radiation, and leaf area. As a result, the temperature inside the greenhouse on November 28th (27.2°C) and the amount of solar radiation inside the greenhouse (4.5MJ / m 2 / d), leaf area (2.5m 2 / m 2 ) was the most similar condition, so the light use efficiency (LUEe) and carbon dioxide supply (SCe) under zero concentration difference carbon dioxide application were used.

[0141] Table 8 is the record database when zero concentration difference carbon dioxide was applied. [Table 8]

[0142] By substituting the data from November 28th, which had the closest temperature, solar radiation, and leaf area index conditions to those at the time of SCa measurement, into equations 1 to 4 above, we calculated the amount of carbon dioxide absorbed from the atmosphere (UCee) = 0.3.

[0143] <Calculation of CO2 absorption from supply, dry matter production, and output (7)> Using the daily cumulative carbon dioxide absorption (UCa) of 12.7 obtained from equation 3 and the carbon dioxide absorption from the atmosphere (UCee) of 0.3, the carbon dioxide absorption from the supply during high-concentration carbon dioxide application (UCsa) of 12.4 was calculated from equation 5 above.

[0144] Next, using the supply-derived carbon dioxide absorption amount (UCsa) = 12.4 and the conversion factor (kcs) = 1.47, the supply-derived dry matter production amount (TDMsa) = 8.4 when high-concentration carbon dioxide was applied was calculated using the above-mentioned equation 9.

[0145] Using the measured daily cumulative carbon dioxide supply (SCa) = 15.8 and the calculated carbon dioxide absorption from the supply (UCsa) = 12.4, the carbon dioxide inflow / outflow between the atmosphere and the facility (LC) = 3.2 was calculated using the above equation 7.

[0146] <Calculation of carbon dioxide application efficiency: Efficiency for crop production> Using the dry matter production derived from the supply when high-concentration carbon dioxide was applied (TDMsa) = 8.4 and the measured daily accumulated carbon dioxide supply (SCa) = 15.8, the dry matter production rate relative to the supplied carbon dioxide = 0.54 was calculated using equation 10.

[0147] In addition, using the dry matter production derived from the supply when carbon dioxide was applied with zero concentration difference (TDMse) = 7.1 and the dry matter production derived from the atmosphere when carbon dioxide was applied with zero concentration difference (TDMee) = 0.2, the dry matter production rate of carbon dioxide applied compared to the case of only carbon dioxide from the atmosphere was calculated as 36.4 from the above-mentioned equation 13.

[0148] <Calculation of carbon dioxide application efficiency: Efficiency for CO2 absorption> Using the carbon dioxide supply amount (UCsa) of 12.4 when high-concentration carbon dioxide was applied and the measured daily cumulative carbon dioxide supply amount (SCa) of 15.8, the absorption efficiency of carbon dioxide derived from the supply when high-concentration carbon dioxide was applied was calculated as 0.79 using the above-mentioned equation 6.

[0149] Using the carbon dioxide inflow / outflow rate between the atmosphere and the facility (LC) = 3.2 and the measured daily cumulative carbon dioxide supply (SCa) = 15.8, the ratio of outside air outflow to the supplied carbon dioxide = 0.21 was calculated using the above-mentioned equation 8.

[0150] In this way, the estimation method of the present invention made it possible to estimate the amount of carbon dioxide absorbed by plants and the carbon dioxide utilization efficiency.

[0151] Example 3: Calculation of the amount of carbon dioxide absorbed from the atmosphere by tomatoes using a function formula Using a method according to one embodiment of the present invention, the amount of carbon dioxide absorbed from the atmosphere when high-concentration carbon dioxide was applied was calculated using a function equation. The test was conducted in Tsukuba City, Ibaraki Prefecture, and the test crop was tomato. Zero-concentration carbon dioxide application was conducted from November 6th to January 9th, followed by high-concentration carbon dioxide application (600 ppm) from January 11th to January 20th, and then high-concentration carbon dioxide application (800 ppm) from January 24th to January 26th. Figure 11 shows the carbon dioxide concentration (ppm) and cumulative carbon dioxide application amount (L) measured or calculated during high-concentration carbon dioxide application.

[0152] (Setting carbon dioxide concentration) The carbon dioxide concentration in the greenhouse was set under the following conditions. (1) When carbon dioxide was applied with zero concentration difference (from November 6th to January 9th), from sunrise to 4:00 p.m., when the carbon dioxide concentration in the greenhouse fell below 400 ppm, carbon dioxide was applied for 5 seconds and then stopped for 150 seconds. (2) For the high-concentration carbon dioxide application (600 ppm, January 11th to January 20th), from sunrise to 4:00 p.m., when the carbon dioxide concentration in the greenhouse fell below 600 ppm, carbon dioxide was applied for 5 seconds, followed by a 150-second pause in application. (3) For the application of high-concentration carbon dioxide (800 ppm, January 24th to January 26th), from sunrise to 4:00 p.m., when the carbon dioxide concentration in the greenhouse fell below 800 ppm, carbon dioxide was applied for 5 seconds, followed by a 150-second pause in application.

[0153] In Examples 1 and 2, the target carbon dioxide concentration during high-concentration carbon dioxide application was set to 450 ppm or 700 ppm, but in Example 3, it was set to 600 ppm and 800 ppm. In addition, the application rate of carbon dioxide was set to the carbon dioxide application rate per second (g / m) in Examples 1 and 2. 2) was measured separately and calculated as the total application amount by multiplying the application time (seconds) by the amount of carbon dioxide applied per second. In Example 3, a flow meter was installed on the CO2 piping, and the flow rate (L) per application and the number of applications (times) were recorded to calculate the total application amount.

[0154] (Calculation of atmospheric carbon dioxide absorption using a function formula) FIG. 12 is a graph showing the function used in Example 3 to calculate the amount of carbon dioxide absorption from the atmosphere. The amount of carbon dioxide absorption from the atmosphere can be calculated as a function of the daily accumulated solar radiation in the greenhouse, the variety, and the LAI (leaf area index). In other words, once the variety and LAI of a plant are determined, the amount of carbon dioxide absorption from the atmosphere is a function proportional to the daily accumulated solar radiation. However, the slope of this function differs depending on the variety. Specifically, the more vigorous the variety, the steeper the slope. When multiple varieties are grown simultaneously in one greenhouse, the amount of carbon dioxide absorption according to the function for each variety can be tallied and apportioned according to the proportion of the number of plants. This calculates the amount of carbon dioxide absorption in the greenhouse. The amount of carbon dioxide absorption and utilization efficiency can also be calculated in a similar manner when different products (e.g., tomatoes and peppers) are grown in one greenhouse.

[0155] The graph shown in Figure 12 is a linear regression of values ​​measured when the atmospheric concentration of carbon dioxide was applied and the windows were closed all day to calculate the amount of carbon dioxide absorbed from the atmosphere by tomatoes having an LAI similar to that of the test tomato varieties when high concentrations of carbon dioxide of 600 ppm and 800 ppm were applied in Example 3. In Example 3, the regression equation y = 1.363x of this graph was used to calculate the amount of carbon dioxide absorbed from the atmosphere by the test tomatoes.

[0156] Table 9 shows the set carbon dioxide concentrations when high concentrations of 600 ppm and 800 ppm of carbon dioxide were applied, the actual measured daily accumulated solar radiation inside the greenhouse, the calculated amount of carbon dioxide absorption at the time of application, the calculated amount of carbon dioxide absorption from the atmosphere using a function formula, and a portion of the calculated amount of carbon dioxide absorption from supply (the calculated amount of carbon dioxide absorption at the time of application minus the calculated amount of carbon dioxide absorption from the atmosphere using a function formula).

[0157] [Table 9]

[0158] Other than those shown in Table 9, light use efficiency, dry matter production, carbon dioxide outflow from the atmosphere, dry matter production relative to supplied carbon dioxide, carbon dioxide absorption rate, and outside air outflow rate can be calculated as explained in Examples 1 and 2. As described above, it was found that the amount of carbon dioxide absorbed by plants, carbon dioxide use efficiency, and the like can be calculated even when a higher concentration of carbon dioxide is applied than in Examples 1 and 2, or when the amount of carbon dioxide absorbed from the atmosphere is calculated using a predetermined function formula obtained in advance. [Explanation of symbols]

[0159] 10. Absorption amount estimation device (carbon dioxide absorption amount estimation device) 13 Calculation section 14 Estimation part 20. Utilization efficiency estimation device (carbon dioxide utilization efficiency estimation device) 23 Calculation section 24 Estimation part

Claims

1. A method for estimating the amount of carbon dioxide absorbed by plants grown in a facility, comprising: a first calculation step of calculating, based on environmental conditions and biological conditions within the facility, the amount of growth of the plant when carbon dioxide is supplied in a first supply step of supplying carbon dioxide into the facility so that the carbon dioxide concentration within the facility coincides with the carbon dioxide concentration in the atmosphere; A second calculation step of calculating a first total carbon dioxide absorption amount absorbed by the plant based on the growth amount; a first estimation step of estimating a value obtained by subtracting the first amount of carbon dioxide supplied in the first supply step from the first total amount of carbon dioxide absorption as the first amount of carbon dioxide absorption absorbed by the plant from the atmosphere; A method for estimating carbon dioxide absorption, comprising:

2. a third calculation step of calculating, based on environmental conditions and biological conditions within the facility, the amount of growth of the plant when carbon dioxide is supplied in the second supply step of supplying carbon dioxide into the facility so that the carbon dioxide concentration within the facility is higher than the carbon dioxide concentration in the atmosphere; A fourth calculation step of calculating a second total carbon dioxide absorption amount absorbed by the plant based on the growth amount; a second estimation step of estimating a value obtained by subtracting the first carbon dioxide absorption amount from the second total carbon dioxide absorption amount as a second carbon dioxide absorption amount obtained by absorbing the supplied carbon dioxide by the plant; The method for estimating the amount of carbon dioxide absorption according to claim 1, further comprising:

3. a step of estimating a carbon dioxide utilization efficiency based on at least one of the first carbon dioxide absorption amount and the second carbon dioxide absorption amount estimated using the method for estimating a carbon dioxide absorption amount according to claim 2; A method for estimating carbon dioxide utilization efficiency, comprising:

4. In the step of estimating the carbon dioxide utilization efficiency, 4. The method for estimating carbon dioxide utilization efficiency according to claim 3, wherein an absorption efficiency of the supplied carbon dioxide is estimated based on the second carbon dioxide absorption amount and the supply amount of carbon dioxide supplied in the second supply step.

5. In the step of estimating the carbon dioxide utilization efficiency, 4. The method for estimating carbon dioxide utilization efficiency according to claim 3, wherein a proportion of the supplied carbon dioxide that flows out of the facility is estimated based on the second carbon dioxide absorption amount and the amount of carbon dioxide supplied in the second supply step.

6. In the step of estimating the carbon dioxide utilization efficiency, 4. The method for estimating carbon dioxide use efficiency according to claim 3, wherein the carbon dioxide use efficiency within the facility is estimated from at least one of a first growth amount of the plant grown from the carbon dioxide absorbed from the atmosphere, calculated from the first carbon dioxide absorption amount, and a second growth amount of the plant grown from the carbon dioxide supplied in the second supply step, calculated from the second carbon dioxide absorption amount.

7. In the step of estimating the carbon dioxide utilization efficiency, 7. The method for estimating carbon dioxide utilization efficiency according to claim 6, wherein a growth rate due to the supplied carbon dioxide is estimated based on the second growth amount and the amount of carbon dioxide supplied in the second supply step.

8. In the step of estimating the carbon dioxide utilization efficiency, 7. The method for estimating carbon dioxide use efficiency according to claim 6, wherein a growth rate using atmospheric carbon dioxide is estimated based on the first growth amount and a third growth amount produced by the plant from the carbon dioxide supplied in the first supply step.

9. A carbon dioxide absorption amount estimation device that estimates the carbon dioxide absorption amount of plants grown in a facility, a calculation unit that calculates, based on environmental conditions and biological conditions within the facility, a growth amount of the plant when carbon dioxide is supplied into the facility so that the carbon dioxide concentration within the facility coincides with the carbon dioxide concentration in the atmosphere, and calculates a first total carbon dioxide absorption amount absorbed by the plant based on the calculated growth amount; an estimation unit that estimates, as a first carbon dioxide absorption amount absorbed by the plant from the atmosphere, a value obtained by subtracting a first carbon dioxide supply amount when carbon dioxide is supplied into the facility so that the carbon dioxide concentration inside the facility coincides with the carbon dioxide concentration in the atmosphere from the first total carbon dioxide absorption amount; A carbon dioxide absorption estimation device equipped with the above.

10. The calculation unit further calculates, based on environmental conditions and biological conditions within the facility, a growth amount of the plant when carbon dioxide is supplied into the facility so that the carbon dioxide concentration within the facility is higher than the carbon dioxide concentration in the atmosphere, and calculates a second total carbon dioxide absorption amount absorbed by the plant based on the calculated growth amount; The estimation unit further estimates a value obtained by subtracting the first carbon dioxide absorption amount from the second total carbon dioxide absorption amount as a second carbon dioxide absorption amount obtained by absorbing the supplied carbon dioxide by the plant. The carbon dioxide absorption amount estimation device according to claim 9.

11. an estimation unit that estimates a carbon dioxide utilization efficiency based on at least one of the first carbon dioxide absorption amount and the second carbon dioxide absorption amount estimated using the carbon dioxide absorption amount estimation device according to claim 10; A carbon dioxide utilization efficiency estimation device equipped with the above.

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