Co2 application system

Abstract

To provide a CO2 application system enabling reduction of supply amount of CO2.SOLUTION: A CO2 application system comprises: a plurality of support posts which are arranged in such a way as to surround a predetermined area of a farm field; tubes which are arranged between a plurality of support posts, and have openings; a partitioning portion which can partition a space in the predetermined area and a space outside the predetermined area; a supply pipe which supplies gas to the tubes; a concentration meter which detects the concentration of CO2 in the space in the predetermined area; and a supply device which supplies gas from the openings to the predetermined area when CO2 concentration detected by the concentration meter becomes lower than a threshold value. The height of the partitioning portion to the top end is a predetermined height or more of field crop in the predetermined area, a height from the ground surface of the predetermined area to the opening is a predetermined height or more of the field crop and a height of the top end of the partitioning portion or less.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a CO2 application system that supplies a gas containing CO2 at a concentration higher than the CO2 concentration in the air to a farm.

Background Art

[0002] CO2 application for obtaining crops by supplying a gas containing CO2 at a concentration higher than the CO2 concentration in the air has already been put into practical use in greenhouses and used in agriculture as exemplified in Patent Document 1 as prior art. According to the prior art, it is predicted that CO2 application promotes photosynthesis of plants and reduces the aperture of stomata, and an increase in crop yield and an improvement in water use efficiency (production per water consumption) are expected.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] CO2 application has been put into practical use only limitedly in a closed system such as a greenhouse, but not in an open system such as open-field cultivation. The main reason is that in an open system, CO2 diffuses into the atmosphere, so it is necessary to supply more CO2 than in a closed system. As a result, the cost becomes higher when comparing the running cost of supplying CO2 with the income from the increase in crop yield. In order to put CO2 application in open-field cultivation into practical use, a technology for reducing the supply amount of CO2 is desired.

[0005] The present invention has been made to meet this demand, and an object thereof is to provide a CO2 application system capable of reducing the supply amount of CO2.

Means for Solving the Problems

[0006] A first aspect for achieving this object is a CO2 application system that supplies a gas containing CO2 at a concentration higher than the CO2 concentration in the air to a farm, including a plurality of columns arranged to surround a predetermined area of the farm, a tube disposed between the plurality of columns and having an opening, a partition capable of partitioning between the space in the predetermined area and the space outside the predetermined area, a supply pipe for supplying the gas to the tube, a concentration meter for detecting the CO2 concentration in the space in the predetermined area, and a supply device for supplying the gas from the opening toward the predetermined area when the CO2 concentration detected by the concentration meter is lower than a threshold value. The height up to the upper end of the partition is equal to or higher than a predetermined height of the crops in the predetermined area, and the height from the ground surface of the predetermined area to the opening is equal to or higher than the predetermined height of the crops and equal to or lower than the height up to the upper end of the partition.

[0007] A second aspect is that, in the first aspect, the partition is a movable type that can be changed between a first state and a second state in which the area of the partition is smaller than that in the first state, and further includes a movable device for changing between the first state and the second state of the partition.

[0008] A third aspect is that, in the second aspect, when the partition is changed from the first state to the second state, the vertical length becomes shorter.

[0009] A fourth aspect is that, in the second aspect, when the partition is changed from the first state to the second state, the horizontal length becomes shorter.

[0010] A fifth aspect is that, in any of the second to fourth aspects, it further includes an anemometer for detecting the wind speed in the space and a wind vane for measuring the wind direction in the space. When the wind speed detected by the anemometer exceeds a threshold value, the supply device supplies the gas from the opening located on the windward side detected by the wind vane among the openings, and the movable device changes the partition on the windward side to the second state.

[0011] A sixth aspect is that, in any of the first to fifth aspects, it further includes a sensor for detecting sunlight, and the supply device supplies the gas when the sensor detects sunlight.

[0012] The seventh aspect further includes a generation device that separates and recovers CO2 from air to generate CO2 in any of the first to sixth aspects, and the supply device supplies a gas using the CO2 generated by the generation device.

Effects of the Invention

[0013] According to the present invention, a space in a predetermined area of a farm is partitioned by a partition portion, the height up to the upper end of the partition portion is set to be equal to or higher than a predetermined height of the agricultural crop, and the height from the ground surface to the opening in the predetermined area is set to be equal to or higher than the predetermined height of the agricultural crop and lower than the height up to the upper end of the partition portion. Since the gas is supplied from the opening toward the predetermined area when the CO2 concentration falls below the threshold value, the diffusion of CO2 outside the predetermined area is reduced by the partition portion, and the heavier CO2 than air flows near the ground surface of the predetermined area and reaches the entire predetermined area. Therefore, the supply amount of CO2 can be reduced.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Best Mode for Carrying Out the Invention

[0015] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of a CO2 application system 10 in one embodiment. In FIG. 1, the illustration of the movable device 30 (described later) is omitted. FIG. 2 is a front view of the CO2 application system 10 as viewed from the direction of arrow II in FIG. 1. In FIG. 2, the illustration of the portions located on the left and right of the portion visible from the front of the CO2 application system 10 is omitted (the same applies to FIGS. 3(a), 3(b), 4(a) and 4(b)). The CO2 application system 10 is a system that supplies a gas containing CO2 at a concentration higher than the CO2 concentration in the air to the farm 11.

[0016] As shown in FIG. 2, the farm 11 is a field for cultivating the crop P. Examples of the crop P include cereals, leafy vegetables, fruit vegetables, root vegetables, tubers, fruit trees, and flowers. Examples of cereals include rice, wheat, and beans. Examples of leafy vegetables include spinach, cabbage, and komatsuna. Examples of fruit vegetables include tomatoes, cucumbers, eggplants, peppers, watermelons, and melons. Examples of root vegetables include daikon radishes, carrots, and burdocks. Examples of tubers include potatoes, sweet potatoes, and yams. Examples of fruit trees include oranges, apples, pears, and grapes. Examples of flowers include chrysanthemums, carnations, lilies, tulips, and cyclamens.

[0017] The crop P is preferably a crop having a C3 photosynthesis circuit such as wheat, rice, barley, and soybeans, because the effect of increasing the yield by high-concentration CO2 is large. Crops having a C4 photosynthesis circuit suitable for a low CO2 concentration such as corn and sorghum are also preferable because the aperture of the stomata decreases due to high-concentration CO2, water consumption decreases, and water use efficiency increases.

[0018] A plurality of support columns 13 are provided in the farm 11. The support column 13 is fixed to the farm 11 by driving the root of the support column 13 into the farm 11 in paddy fields and fields, or by arranging an anchor (not shown) at the root of the support column 13 placed on the ground surface 12 of the farm 11 in fields and driving the anchor into the farm 11 or placing a heavy stone (not shown) at the root of the support column 13.

[0019] The support column 13 supports the tube 14 provided with the opening 15. The tube 14 is spanned between the support columns 13 arranged at intervals. The tube 14 is exemplified as being made of polyethylene and having a thickness of about 20 mm, and the opening 15 of the tube 14 is exemplified as having a plurality of holes with different diameters of about 0.5 - 1.0 mm. A small column (not shown) may be provided between the support columns 13, and the tube 14 may be supported by the support columns 13 and the small column.

[0020] As shown in FIG. 1, a plurality (16 in this embodiment) of support columns 13 are arranged so as to surround a predetermined area 16 of the farm 11. In this embodiment, two support columns 13 are bundled together, and the bundles are arranged at eight locations at equal intervals (for example, 5 - 10 m). The tubes 14 supported by the support columns 13 are arranged with the openings 15 (see FIG. 2) facing the center of the predetermined area 16, and eight tubes are arranged so as to surround the predetermined area 16.

[0021] The partition part 17 is a wind-blocking member capable of separating the space of the predetermined area 16 from the space outside the predetermined area 18. The partition parts 17 in this embodiment are respectively arranged between the bundles of the support columns 13 (a total of eight sheets), and the overall shape of the partition parts 17 and the support columns 13 together forms an octagonal cylindrical shape, partitioning the octagonal predetermined area 16. In order to give the energy of sunlight to the crops P and give rainwater to the farm 11, the roof covering the predetermined area 16 is not provided on the partition part 17. The tubes 14 are arranged in the space of the predetermined area 16 partitioned by the partition parts 17 so as to surround the predetermined area 16.

[0022] The concentration meter 19 is a device that detects the concentration of CO2, and a plurality of them are arranged in a predetermined area 16 at intervals from each other. The wind direction and speed meter 20 is a device that detects the speed and direction of the wind blowing in the space of the predetermined area 16, and is arranged at the center of the predetermined area 16. The sensor 21 is a device that detects the sunlight in the predetermined area 16, and is arranged in the predetermined area 16. The sensor 21 in the present embodiment is a sunlight amount sensor that detects light. Examples of the sunlight amount sensor include those that directly measure the intensity of light using a photodiode, a phototube, etc., and a thermopile type sensor that detects the amount of infrared rays and calculates the energy of light.

[0023] The generating device 22 is a device that generates carbon dioxide (gas). The generating device 22 in the present embodiment includes a tank 23 that stores liquefied carbon dioxide (liquid), a regulating valve 24 that regulates the amount of liquefied carbon dioxide flowing out from the tank 23, and a heat exchanger 25 that heats and vaporizes the liquefied carbon dioxide that has passed through the regulating valve 24 to convert it into CO2 (gas).

[0024] The supply device 26 includes a branch pipe 27 that branches into eight and is connected downstream of the heat exchanger 25, and a regulating valve 28 arranged in each of the branch pipes 27. The supply pipe 29 connects between the regulating valve 28 and each tube 14. One end of each tube 14 is connected to the supply pipe 29, and the other end of each tube 14 is closed. One or more regulating valves 28 can be arbitrarily opened and closed. When the regulating valve 28 opens, the CO2 that has entered the tube 14 through the supply pipe 29 is discharged from the opening 15 into the predetermined area 16 and mixes with the air in the predetermined area 16.

[0025] The partition part 17 that partitions the predetermined area 16 will be described with reference to FIG. 3. FIG. 3(a) is a front view of the CO2 application system 10 when the partition part 17 is in the first state as viewed from the direction of arrow III in FIG. 1 (from outside the predetermined area 16). The partition part 17 is a movable type that can be changed between a first state and a second state in which the area of the partition part 17 is smaller than the first state.

[0026] The movable device 30 is a device that changes the first state and the second state of the partition part 17. The movable device 30 includes a motor (not shown) and is disposed at the upper part of the support column 13. The partition part 17 is a flexible sheet-like member (curtain) and is suspended by the movable device 30. In order to reduce the left and right gaps formed between the partition part 17 and the support column 13, the left and right ends of the partition part 17 are respectively constrained by the support column 13. The partition part 17 is integrally formed with a belt 17a having a tensile strength higher than the tensile strength of the partition part 17. When the partition part 17 is in the first state, the belt 17a extends in the vertical direction.

[0027] Figure 3(b) is a front view of the CO2 application system 10 when the partition part 17 is in the second state. When the motor of the movable device 30 winds up the belt 17a of the partition part 17 in the first state, the partition part 17 is also wound up by being pulled by the belt 17a and changes to the second state. The vertical length L2 of the partition part 17 in the second state is shorter than the vertical length L1 (see Figure 3(a)) of the partition part 17 in the first state. The second state allows air to flow more easily through the predetermined area 16 than the first state.

[0028] The movable device 30 disposed at the upper part of the support column 13 is a part of the partition part 17 for blocking wind and partitioning the predetermined area 16 together with the partition part 17. The lengths L1 and L2 are the sum of the vertical length of the movable device 30 and the vertical length of the partition part 17. The distance L3 between the lower end 17b of the partition part 17 and the ground surface 12 in the second state is longer than the distance between the lower end 17b of the partition part 17 (see Figure 3(a)) and the ground surface 12 in the first state. Since the partition part 17 is disposed between the support columns 13 that support the tubes 14, compared with the case where the partition part 17 is disposed separately from the support column 13, the number of parts can be reduced, and the area occupied by the support column 13 and the partition part 17 in the field 11 can be decreased.

[0029] Returning to FIG. 2 for explanation, the densitometer 19 is disposed at a position lower than the opening 15 of the tube 14. This is because CO2 is heavier than air, and it is for detecting the concentration of CO2 in the space where the CO2 released from the opening 15 exists. The wind direction and speed meter 20 is disposed at a position higher than the height H1 from the ground surface 12 to the upper end of the partition 17 (the upper end of the partition combining the support column 13 and the movable device 30) (for example, at a height of 2.5 m from the ground surface 12). This is for detecting the direction and speed of the wind that is not blocked by the support column 13, the partition 17, etc.

[0030] The height H1 is determined according to the height H2 of the crop P. As the crop P grows, the support column 13 is replaced with a longer one, or a support column 13 longer than the height that the crop P will reach in the future is used without replacing the support column 13, so that H1≧H2. Also, the height H3 from the ground surface 12 to the opening 15 (the highest opening) of the tube 14 is in the relationship of H2≦H3≦H1. Since CO2 is heavier than air, due to the relationship of H2≦H3, CO2 can be released from the opening 15 so that the crop P can absorb it. Furthermore, due to the relationship of H3≦H1, the amount of CO2 that leaks out of the partition 17 and into the area outside the predetermined area 18 among the CO2 supplied to the predetermined area 16 can be reduced.

[0031] Referring to FIG. 4, the partition 31 in the modified example will be described. FIG. 4(a) is a front view of the CO2 application system 10 in the modified example when the partition 31 is in the first state as viewed from the direction of arrow III in FIG. 1 (from outside the predetermined area 16). The partition 31 is a movable type that can be changed between a first state and a second state in which the area of the partition 31 is smaller than that in the first state.

[0032] The partition 31 is a flexible sheet-like member (curtain) and is suspended by a movable device 30 including a motor (not shown). One end in the horizontal direction (the left end in the figure) of the partition 31 is fixed to the support column 13, and the other end in the horizontal direction (the right end in the figure) moves horizontally in conjunction with the operation of the motor.

[0033] FIG. 4(b) is a front view of the CO2 application system 10 in a modification when the partition part 31 is in the second state. When the motor moves the end of the partition part 31 in the first state horizontally and folds the partition part 31 on the support column 13, the partition part 31 changes to the second state. The horizontal length W2 of the partition part 31 in the second state is shorter than the horizontal length W1 (see FIG. 4(a)) of the partition part 31 in the first state. The support column 13 on which the partition part 31 is folded is a part of the partition part 17 in order to block the wind together with the partition part 31 and partition a predetermined area 16. The lengths W1 and W2 are the sum of the horizontal length of the support column 13 and the horizontal length of the partition part 31.

[0034] FIG. 5 is a block diagram showing the electrical configuration of the CO2 application system 10. The CO2 application system 10 includes a control device 32 that controls each device. The control device 32 includes a CPU, a ROM, a RAM, and a backup RAM (none of which are shown). The concentration meter 19 and the wind direction and wind speed meter 20 detect, for example, the CO2 concentration and the wind speed at 1-second intervals, and average the five detection results in 5 seconds and input them to the control device 32. The wind direction and wind speed meter 20 and the sensor 21 detect the wind direction and the sunshine amount at 1-second intervals, for example, and input the results to the control device 32.

[0035] Based on the results input by the concentration meter 19, the wind direction and wind speed meter 20, and the sensor 21, the control device 32 operates the generating device 22, the supply device 26, and the movable device 30. The control device 32 opens the regulating valve 24 and operates the heat exchanger 25 to generate CO2, and opens and closes a specific regulating valve 28 to control the release of CO2 from the tube 14 connected to the regulating valve 28. The control device 32 operates a specific movable device 30 to set the partition part 17 to the first state or the second state.

[0036] FIG. 6 is a flowchart of the CO2 application process repeatedly executed by the CPU of the control device 32. The CO2 application process is a process of supplying CO2 to the farm 11. Based on the inputs from the densitometer 19, the wind direction and speed meter 20, and the sensor 21, the CPU acquires the sunlight amount, the CO2 concentration, the wind direction, and the wind speed (S1), and determines whether the sunlight amount is more than a predetermined threshold value (S2). The threshold value in S2 is, for example, the sunlight amount corresponding to the energy of light that allows the crop P to perform photosynthesis. If the sunlight amount is less than or equal to the threshold value (S2: No), since the sunlight amount required for photosynthesis is insufficient, the CPU ends the CO2 application process, prevents the supply of CO2 that cannot be used by the crop P for photosynthesis, and reduces the CO2 supply amount.

[0037] If the sunlight amount is more than the threshold value (S2: Yes), the CPU determines whether the CO2 concentration is lower than the threshold value (S3). The threshold value in S3 is a value higher than the CO2 concentration in the atmosphere (about 400 ppm) (for example, a value in the range of 500 - 1000 ppm). If the CO2 concentration is equal to or higher than the threshold value (S3: No), since the crop P is in a state where high-concentration CO2 is being supplied, the CPU ends the CO2 application process, prevents the supply of excessive CO2, and reduces the CO2 supply amount.

[0038] If the CO2 concentration is lower than the threshold value (S3: Yes), the CPU determines whether the wind speed is 0.3 m / s or less (S4). If the wind speed is 0.3 m / s or less (S4: Yes), the CPU executes the supply process in a windless state (S5). In the supply process, the CPU sets the eight partition parts 17 to the first state, releases CO2 from the openings 15 of every other one of the eight tubes 14 (a total of 4 tubes), and stops the release of CO2 from the remaining every other one of the tubes 14 (a total of 4 tubes). The CPU alternately switches the set of the four tubes 14 that release CO2, for example, every 10 seconds as long as the windless state continues.

[0039] In the supply process in S5, since all of the partition parts 17 are in the first state, the amount of CO2 leaking beyond the partition part 17 to the outside area 18 can be reduced. Since CO2 is released from every other tube 14 (a total of 4 tubes), CO2 can be efficiently distributed throughout the entire predetermined area 16 inside the partition part 17.

[0040] When the wind speed is not 0.3 m / s or less (S4: No), the CPU determines whether the wind speed exceeds 0.3 m / s and is 15 m / s or less (S6). When the wind speed exceeds 0.3 m / s and is 15 m / s or less (S6: Yes), the CPU releases CO2 from the openings 15 of the tubes 14 located on the upwind side among the 8 tubes 14, and the tubes located on both sides adjacent to that tube (a total of 3 tubes), and stops the release of CO2 from the remaining tubes (a total of 5 tubes) (S7). The partition parts 17 (a total of 3 sheets) located behind the tubes 14 from which CO2 is being released are set to the second state, and the remaining partition parts 17 (a total of 5 sheets) are set to the first state (S8).

[0041] Thereby, wind enters the predetermined area 16 from the partition part 17 in the second state, and the CO2 is carried from the upwind side to the downwind side of the predetermined area 16. Since the partition part 17 on the downwind side is in the first state, the CO2 flowing out from the downwind side to the outside area 18 can be reduced. Since it is not necessary to supply CO2 in anticipation of the amount flowing out to the outside area 18, the supply amount of CO2 can be reduced.

[0042] When the wind speed does not exceed 0.3 m / s and is 15 m / s or less (S6: No), the CPU stops the release of CO2 from all the tubes (a total of 8 tubes) (S9), and sets all the partition parts 17 to the second state (S10). Thereby, damage to the partition part 17 due to strong wind can be prevented.

Example

[0043] The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0044] Using a computer, a physical model of the CO2 application system 10 and the agricultural crop P (rice) in the embodiment was created, and the diffusion properties of CO2 were calculated. The object of the simulation was a three-dimensional axisymmetric model. The dimensions of each part of the model were as follows. The predetermined area 16 was a regular octagon surrounded by eight partition parts 17 and eight tubes 14. The height H1 of the partition part 17 was 1 m, the width of one partition part 17 was 5 m, the length of one tube 14 was 5 m, the inner diameter of the tube 14 was 38 mm, the height H3 of the tube 14 was 80 cm, the diameter of the opening 15 was 6 mm, the interval between the openings 15 in the length direction of the tube 14 was 40 mm, the agricultural crop P was arranged at the lattice points of a rectangular lattice with a short side of 16 cm and a long side of 30 cm, and the height H2 of the agricultural crop P was 46 cm.

[0045] The analysis conditions were as follows. The analysis model was a steady-state analysis ideal gas K-ε turbulence model, and the analysis grid was 2.1 million (hexahedral grid). Under atmospheric pressure (gauge pressure 0 Pa), when all the partition parts 17 were in the first state and CO2 was released from the opening 15 into the inside of the predetermined area 16 at a speed of 100 m / s, the concentration distribution of CO2 was calculated when a wind with a wind speed of 0.8 m / s was blowing from the outside of the predetermined area 18 toward one of the partition parts 17.

[0046] Figure 7(a) shows the calculation result (example) of the CO2 concentration distribution in the cross-section at a height of H2 = 46 cm. Figure 7(b) shows the calculation result (comparative example) of the CO2 concentration distribution in the cross-section at the same height when there is no partition part 17. Figures 7(a) and 7(b) represent the CO2 concentration with white and black shades. The part closer to black has a lower CO2 concentration, and the part closer to white has a higher CO2 concentration. The white part has a CO2 concentration of 1×10 -4 kmol / m 3 or more.

[0047] As shown in Figure 7(a), when there is a partition part 17, except for a part on the upwind side of the predetermined area 16 surrounded by the partition part 17, the white part almost forms a regular octagon. Therefore, it is clear that the partition part 17 can widely secure a range where the CO2 concentration is 1×10 -4 kmol / m 3 or more.

[0048] On the other hand, as shown in Fig. 7(b), if there is no partition part 17, the range (white part) where the CO2 concentration is 1×10 -4 kmol / m 3 or more disappears. Further, compared with Fig. 7(a), the width of the range where CO2 exists becomes narrower, and the range moves downwind. From this, it is clarified that when there is the partition part 17, the diffusion of CO2 can be reduced, and the CO2 concentration of almost the entire predetermined area 16 surrounded by the partition part 17 can be increased. According to the embodiment, it is clarified that the supply amount of CO2 can be reduced because it is not necessary to supply CO2 in anticipation of the amount flowing out to the outside 18 of the predetermined area.

[0049] As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above embodiments at all, and it can be easily inferred that various improvements and modifications are possible without departing from the gist of the present invention. For example, the wind speed threshold values in the processes of S4 and S6 of the CO2 application process are examples, and the threshold values are appropriately set according to the type of the crop P and the geography of the farm 11.

[0050] In the embodiment, the case where an octagonal range is provided in the predetermined area 16 using eight linear tubes 14 has been described, but it is not necessarily limited to this. The number and length of the tubes 14 can be set as appropriate. It is of course possible to increase the number of the tubes 14 and make the shape of the range provided in the predetermined area 16 a polygon having more corners than an octagon. Since the shape of the tube 14 can also be set as appropriate, it is of course possible to use an arc-shaped tube 14 to make the range provided in the predetermined area 16 circular.

[0051] In the embodiment, the generator 22 that generates CO2 has been described as vaporizing the liquefied carbon dioxide gas (liquid) stored in the tank 23 to obtain CO2 (gas), but it is not necessarily limited to this. Other generators include, for example, devices that utilize direct air capture (DAC) technology to separate and recover CO2 from air (including exhaust gas containing CO2 generated from factories, power plants, etc.) to generate CO2. DAC includes technologies such as adsorbing or absorbing CO2 in solids or liquids and recovering CO2 by membrane separation. DAC is preferable because it eliminates the need to store liquefied carbon dioxide gas in the tank 23.

[0052] In the embodiment, since CO2 vaporized from liquefied carbon dioxide gas is supplied to the farm 11, the case where 100% of the gas supplied to the farm 11 is CO2 has been described, but it is not necessarily limited to this. This is because promoting the photosynthesis of the crop P can be achieved by supplying a gas containing a higher concentration of CO2 than the CO2 concentration in the atmosphere (about 400 ppm) to the farm 11.

[0053] In the embodiment, the partition parts 17, 31 that block the wind have been described as sheet-like members, but it is not necessarily limited to this. Other members include, for example, curtain-like members formed by arranging and connecting thin rods or plates. Also in this case, the partition parts 17, 31 can be rolled up or folded into a roll shape to be in a second state.

[0054] In the embodiment, the case where the partition parts 17, 31 are arranged between the support columns 13 that support the tube 14 and the support columns 13, and the movable device 30 is arranged on the support columns 13 has been described, but it is not necessarily limited to this. It is of course possible to arrange the partition parts 17, 31 and the movable device 30 separately from the support columns 13.

[0055] In the embodiment, the case where the partition part 31 in the modified example is single-opening has been described, but it is not necessarily limited to this. It is of course possible to make the partition part 31 double-opening.

[0056] Although the case where the CO2 application system 10 includes the wind direction and speed meter 20 has been described in the embodiment, it is not necessarily limited to this. Instead of the wind direction and speed meter 20, it is of course possible to use a wind vane that does not have a function of detecting wind speed, detect the wind direction, and put the partition part 17 on the upwind side into the second state according to the wind direction.

[0057] It is of course possible to make the second state of the partition part 17 on the upwind side in the process of S8 of the embodiment and the second state in the process of S10 different states. For example, in the second state in the process of S10, the area of the partition part 17 is minimized to prevent damage to the partition part 17, and in the second state in the process of S8, as long as the wind can be put into the predetermined area 16, the area of the partition part 17 can be set to an appropriate size between the minimum and the maximum. At this time, the area of the partition part 17 may be changed according to the wind speed.

[0058] Although the case where the sensor 21 detects the sunlight amount and the control device 32 ends the CO2 application process when the sunlight amount is below the threshold has been described in the embodiment, it is not necessarily limited to this. It is of course possible that the sensor 21 detects the date and time, and the control device 32 determines whether it is the time from sunrise to sunset (the time when the sun is out) based on the date and time, ends the CO2 application process at night when the sun has set, and executes the CO2 application process when the sun is out. In this case, since CO2 is not supplied at night when photosynthesis cannot occur, the supply amount of CO2 can be reduced.

Explanation of Signs

[0059] 10 CO2 application system 11 Farm 12 Ground surface 13 Support column 14 Tube 15 Opening 16 Predetermined area 17, 31 Partition part 19 Concentration meter 20 Wind direction and speed meter 21 Sensor 22 Generation device 26 Supply device 29 Supply pipe 30 Movable device P Crop H1 Height to the upper end of the partition part H2 Height of the crop H3 Height from the ground surface to the opening L1, L2 Vertical length of the partition part W1, W2 Horizontal length of the partition part

Claims

1. CO in the air ２ CO at a concentration higher than the concentration ２ A CO application system that supplies a gas containing CO to a farm ２ is provided, A plurality of columns arranged to surround a predetermined area of the farmland; A tube disposed between the plurality of columns and having an opening; A partition capable of partitioning between the space in the predetermined area and the space outside the predetermined area; A supply pipe for supplying the gas to the tube; A CO concentration meter for detecting the CO concentration in the space within the predetermined area ２ and a concentration meter for detecting the concentration CO detected by the concentration meter ２ a supply device configured to supply the gas from the opening toward the predetermined area when the concentration falls below a threshold value; and The height up to the upper end of the partition is equal to or greater than a predetermined height of the crops in the predetermined area; The height from the ground surface of the predetermined area to the opening is CO which is equal to or greater than the predetermined height of the agricultural crop and equal to or less than the height to the upper end of the partition portion ２ Application system

2. The partition is a movable type that can be changed between a first state and a second state in which the area of the partition is smaller than the first state; The CO application system according to claim 1, further comprising a movable device that changes the first state and the second state of the partition portion. ２ Application system.

3. The partition part is a CO according to claim 2, the vertical length of which becomes shorter when changed from the first state to the second state. ２ Application system.

4. The partition part is a CO application system according to claim 2, the horizontal length of which becomes shorter when changed from the first state to the second state. ２ Application system.

5. A wind speed meter for detecting the wind speed of the space; A wind direction meter for measuring the wind direction of the space; and When the wind speed detected by the wind speed meter exceeds a threshold value, The supply device supplies the gas from the opening located on the windward side detected by the wind direction meter among the openings toward the predetermined area; The movable device is the CO application system according to any one of claims 2 to 4, which sets the partition portion on the upwind side to the second state. ２ application system.

6. Further comprising a sensor for detecting sunlight; The supply device is the CO application system according to any one of claims 1 to 4, which supplies the gas when the sensor detects sunlight. ２ Application system.

7. Separate and recover CO from air and further provide a production device for generating CO ２ and generate CO ２ and further include a production device for generating CO The supply device supplies the gas using the CO generated by the generation device. ２ The CO application system according to any one of claims 1 to 4. ２ ​

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