Method for cultivating plant body and plant body cultivation apparatus

Abstract

To provide a method for cultivating a plant body and a plant body cultivation apparatus that allow detection of changes in the condition of the plant body and enable execution of treatment according to the detected result.SOLUTION: According to one embodiment of the present invention, a method for cultivating a plant body is provided, the method including a first step of preparing a plant body having a first root extending in soil, a second step of inducing a second root in a part of an aboveground portion of the plant body, a third step of detecting a condition of the second root or a condition of a surrounding environment of the second root, and a fourth step of performing a predetermined treatment on the plant body based on a detection result in the third step.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and an apparatus for cultivating a plant. [Background technology]

[0002] Conventionally, chemical fertilizers such as nitrogen fertilizers, phosphate fertilizers, and potassium fertilizers have been used in the cultivation of plants. A fertilizer sheet has been proposed in which these fertilizer components are supported on a substrate made of polylactic acid (see Patent Document 1). However, only about 10% of the fertilizer components supplied to the soil are absorbed by the plants, with the majority being wasted. Furthermore, plant growth is easily affected by changes in the environment. Therefore, by growing plants efficiently, it is possible to control the taste, size, and speed of fruit production. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3167415 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above circumstances, the present invention provides a method and an apparatus for cultivating plants that are capable of detecting changes in the state of the plants and taking measures in accordance with the detection results. [Means for solving the problem]

[0005] According to one aspect of the present invention, there is provided a method for cultivating a plant, which comprises a first step of preparing a plant having first roots in the ground, a second step of inducing second roots in a part of the above-ground part of the plant, a third step of detecting the condition of the second roots or the condition of the environment surrounding the second roots, and a fourth step of applying a predetermined treatment to the plant based on the detection result in the third step.

[0006] According to this aspect, it is possible to detect changes in the condition of the plant body and to take measures according to the detection results. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a conceptual diagram showing an embodiment of a plant cultivation device. [Figure 2] FIG. 2 is a conceptual diagram showing the state in which second roots are induced in the plant body of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, a plant cultivation method and a plant cultivation device will be described in detail based on preferred embodiments. [Plant cultivation device] Fig. 1 is a conceptual diagram showing an embodiment of a plant cultivation apparatus, and Fig. 2 is a conceptual diagram showing a state in which second roots have been induced in the plant of Fig. 1. The plant cultivation apparatus 1 shown in FIG. 1 (hereinafter also simply referred to as "cultivation apparatus 1") is an apparatus for cultivating a plant P having first roots R1 (having a root system) in the ground UG.

[0009] This cultivation device 1 includes a water retention unit 2, a shading unit 3, a water supply unit 4, a detection unit 6, and a nutrient component adjustment unit (treatment unit) 5. The cultivation device 1 is configured to induce second roots R2 in a part of the above-ground part S (shoot system) by supplying water to the part of the above-ground part S via the water retention unit 2. The moisture retention unit 2 has the function of retaining moisture around a portion of the above-ground portion S of the plant P. The moisture retention unit 2 has a retention unit main body 21 and a moisture retention body 22 that is arranged between the retention unit main body 21 and the plant P so as to come into contact with a portion of the above-ground portion S.

[0010] The holder body 21 may be made of a hard body or a soft (flexible) body. Examples of materials that can be used to make a hard body include hard resin materials such as polycarbonate, ceramic materials, and metal materials. Examples of materials that can be used to make a soft body include soft resin materials such as polypropylene and rubber materials. The holder body 21 may also be made of a biodegradable material. In this case, the holder body 21 may be biodegraded and used as a nutrient component for the plant P. The moisture retainer 22 may be integrated with the retainer body 21 or may be formed as a separate body from the retainer body 21 and filled inside the retainer body 21 .

[0011] The moisture holder 22 may be made of any material that can retain the supplied moisture, but preferably contains a water-absorbent polymer. By configuring the moisture holder 22 to contain a water-absorbent polymer, the moisture holder 2 can retain a necessary and sufficient amount of moisture. Furthermore, since the water-absorbing polymer swells upon absorbing water, it can apply pressure to a part of the above-ground part S of the plant body P. This can be expected to promote the induction of second roots R2 in that part.

[0012] Such water-absorbing polymers are not particularly limited, but examples thereof include polyvinylpyrrolidone, cross-linked polyvinylpyrrolidone, polyacrylic acid, polymethacrylic acid, sodium polyacrylate, gelatin, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, carboxyvinyl polymer, polyvinyl alcohol, polyvinyl ether, starch, polyethylene glycol, polypropylene glycol, polyoxyethylene polyoxypropylene glycol, and dextran. In place of the water-absorbent polymer, at least one of moss such as sphagnum moss and soil can be used. The entire water-retaining section 2 can also be made of at least one of water-absorbent polymer, moss, and soil.

[0013] The shading part 3 has the function of preventing light from reaching a part of the above-ground part S of the plant body P (i.e., shading a part of the above-ground part S). By providing the shading part 3, the induction of the second root R2 can be sufficiently promoted. The light-shielding portion 3 may be formed by forming the holder body 21 itself from a light-shielding film, by a light-shielding film placed on the outer periphery of the holder body 21, or by coloring the holder body 21 itself black or a dark color. In the former case, it is sufficient to cover a part of the aboveground portion S together with the moisture retainer 22 with a light-shielding film.

[0014] The moisture supply unit 4 has a function of supplying moisture to the moisture retention unit 2. The moisture supply unit 4 has a first container 41 that stores moisture, a tube 42 that connects (communicates) the first container 41 with the moisture retention unit 2 (retention unit main body 21), and a pump 43 provided midway along the tube 42. According to this configuration, the operation of the pump 43 can be controlled via a control unit (not shown) to accurately adjust the amount of water supplied to the water retainer 22. This makes it possible to control the induction of the second roots R2. The pump 43 may also be configured to drip water by its own weight into the water retention section 2. In this case, the amount of water dripped can be controlled according to the amount of water absorbed by the water retention section 2. Furthermore, if the water retention capacity of the water retention unit 2 is sufficiently large, the water supply unit 4 can be omitted.

[0015] In the illustrated configuration, the water supplying unit 4 is fixed to the water retention unit 2, but it may be configured to be detachable from the water retention unit 2. In this case, the space for arranging the water supplying unit 4 (first container 41) can be saved, and the cultivation area for the plant P can be expanded. Examples of a mode in which the water supply unit 4 can be detached from the water retention unit 2 include a work vehicle equipped with the first container 41, and an air vehicle (e.g., a drone) having the first container 41. If the work vehicle is an air vehicle, there is no need to secure space for the work vehicle to move, which is advantageous from the viewpoint of expanding the cultivation area of ​​the plant P.

[0016] The detection unit 6 has a function of detecting the condition of the second root R2 or the condition of the surrounding environment of the second root R2. The detection unit 6 has a sensor 61 and a transmission device 62 electrically connected to the sensor 61 and transmitting the detection result detected by the sensor 61. Here, the detection results include various detected values ​​or their changes over time, and are not particularly limited to, but are preferably at least one detected value or change over time in a detected value selected from the group consisting of impedance, pH, ion concentration, nitrogen source concentration, water concentration, carbon dioxide concentration, active oxygen (oxygen radical) concentration, plant hormone concentration, volatile organic compound concentration, pigment concentration, and nucleic acid concentration. By detecting these values, the condition of the plant P, such as nutrient deficiency or excess, water deficiency or excess, salt deficiency or excess, heat deficiency or excess, light deficiency or excess, pathogen infection, pest infestation, etc., can be determined.

[0017] Examples of ions include sodium ions, potassium ions, calcium ions, magnesium ions, sulfur ions, sulfide ions, iron ions, manganese ions, boron ions, zinc ions, copper ions, chloride ions, molybdenum ions, and nickel ions. Examples of nitrogen sources include nitrate ions, ammonium ions, and components (ions) derived from organic fertilizers. Examples of volatile organic compounds include ethylene, aldehydes, alcohols, acetic acid, indole, and terpenes. Examples of pigments include anthocyanins, chlorophyll, carotenoids, and flavonoids.

[0018] The detection target may be the second root R2 itself, or the surrounding environment of the second root R2, such as water (liquid) or the atmosphere (gas). The sensor 61 may be, for example, an electrochemical sensor or an optical sensor. Specific examples of electrochemical sensors include amperometric sensors, conductivity meters, glass electrodes, micro-fabricated field effect transistors, printed electrodes, etc. Note that glass electrodes, micro-fabricated field effect transistors, and printed electrodes are used by being directly inserted into the moisture holder 22. Specific examples of optical sensors include optical probes (spectroscopy, imaging), X-ray fluorescence analyzers, Raman spectrometers, positron imagers, spectral imagers, satellite imagers, and the like.

[0019] The nutrient component adjusting unit 5 has the function of adjusting the amount of nutrient components necessary for the growth of the plant P, which are supplied via the second roots R2 (i.e., performing a predetermined treatment on the plant P based on the detection results by the detection unit 6). The nutrient component adjusting unit 5 has a second container 51 that stores nutrient components, a tube 52 that connects (communicates) the second container 51 with the water retention unit 2 (retention unit main body 21), and a pump 53 provided midway along the tube 52. According to this configuration, by controlling the operation of the pump 53 via a control unit (not shown), it is possible to accurately adjust the amount of nutrients supplied to the water retainer 22. This makes it possible to accurately control the growth (condition) of the plant P. Pump 53 may also be configured to drip water under its own weight into water retention section 2. In this case, the amount of water dripped can be controlled according to the amount of water absorbed by water retention section 2. Nutrients necessary for the growth of plant P include, for example, nitrogen fertilizers such as ammonium sulfate and urea, phosphate fertilizers such as superphosphate and iodized phosphate fertilizer, potassium fertilizers such as potassium sulfate and potassium chloride, organic fertilizers, and mycorrhizal fungi.

[0020] In the illustrated configuration, the nutrient component adjuster 5 is fixed to the water retention unit 2, but it may be configured to be detachable from the water retention unit 2. In this case, the space for arranging the nutrient component adjuster 5 (second container 51) can be saved, and the cultivation area for the plant P can be expanded. Examples of embodiments in which the nutrient component adjuster 5 can be detached from the water retention unit 2 include a work vehicle equipped with the second container 51, and an aerial vehicle (e.g., a drone) having the second container 51 (and having a treatment function for performing a predetermined treatment). Aerial vehicles are advantageous from the perspective of expanding the cultivation area of ​​the plant P, as there is no need to secure space for the work vehicle to move around. In this case, the entire system, including the aerial vehicle, can be automated, thereby reducing human effort. Moreover, the flying object may further have a first container 41 for storing water, and may be configured to function as the water supply unit 4. In this case, the configuration of the cultivation device 1 can be simplified.

[0021] Using such a cultivation device 1, a plant body P can be cultivated. [Cultivation method of the plant] Hereinafter, one embodiment of a method for cultivating a plant P using the cultivation apparatus 1 (hereinafter also simply referred to as a "cultivation method") will be described. The cultivation method of this embodiment includes a first step of preparing a plant P having a first root R1 extending underground UG; a second step of inducing a second root R2 in a part of the above-ground part S of the plant P; a third step of detecting the condition of the second root R2 or the condition of the environment surrounding the second root R2; and a fourth step of applying a predetermined treatment to the plant P based on the detection results of the third step (in this embodiment, adjusting the amount of nutrients necessary for the growth of the plant P that are supplied via the second root R2). Each step will be explained below in order.

[0022] [1] First step First, in the first step, a plant body P having a first root R1 extending underground UG is prepared. Such a plant P may be a plant cultivated by the worker himself or may be a naturally grown plant. Then, a plant P suitable for cultivation is selected from the plurality of plants.

[0023] [2] Second step Next, in the second step, second roots R2 are induced in a part of the above-ground part S of the selected plant body P. First, as described above, the bark (in the case of woody plants, the bark is removed without leaving the cambium) is removed from a portion of the above-ground part S of the plant body P, and then a moisture retention unit 2 and a shading unit 3 are attached to that portion, a moisture supply unit 4 is placed, and the cultivation device 1 is assembled. The above-ground portion S is preferably a trunk or stem of the plant P. From the above-ground portion S of such a plant P, second roots (adventitious roots as aerial roots) R2 can be induced relatively easily. In this state, moisture is supplied from the moisture supply unit 4 to the moisture retention unit 2 (moisture retention body 22). Then, moisture is supplied to a part of the aboveground portion S via this moisture retention unit 2. With this configuration, it is possible to suppress dissipation due to evaporation of the moisture retention unit 2. At this time, the moisture retained in the moisture retention unit 2 may be heated as necessary.

[0024] That is, in the second step, it is preferable to keep a part of the above-ground part S shaded by a shading film, in an environment of 30% RH or more and 100% RH or less, or in the presence of moisture, at a temperature of about 15° C. or more and 40° C. or less. This allows the second roots R2 to be appropriately induced in the part of the above-ground part S. The temperature of the water when inducing the second root R2 is set based on the type of plant P being cultivated and is not particularly limited, but is preferably about 20° C. to 40° C., and more preferably about 20° C. to 35° C. Setting the temperature within such a range makes it easy to adjust the degree of induction of the second root R2. In this way, second roots R2 are induced in part of the above-ground portion S, as shown in Figure 2.

[0025] Thereafter, the water supply unit 4 supplies a liquid containing nutrients to the water retention unit 2 (moisture retention body 22). This allows the plant P to be cultivated. This method allows selective application of nutrients in amounts necessary and sufficient for the growth of the plant P, thereby preventing the nutrients from being wasted, i.e., increasing the utilization efficiency of the nutrients (fertilizer components). At this time, the content of the nutrients may be adjusted depending on the season, the growth status of the plant P (immature, old, etc.), the condition of the fruit, and the disease status of the plant P. When nutrients are supplied to the first root R1, the amount of nutrients to be supplied is determined taking into account the amount that is not absorbed by the first root R1 and is dissipated into the soil.

[0026] In this embodiment, it is preferable to supply the second root R2 with nutrient components in an amount of 1% to 90% of the amount supplied to the first root R1. When supplying nutrient components to the second root R2, even such a small amount can allow the plant P to grow sufficiently. It is more preferable that the amount of nutrient components supplied to the second root R2 be approximately 1% to 70% of the amount supplied to the first root R1, and even more preferably approximately 1% to 40%. The method for inducing the second root R2 in a portion of the above-ground part S is not limited to the method of this embodiment, and may also be, for example, a method of supplying (injecting or applying) a drug or hormone that promotes the induction of adventitious roots to a portion of the above-ground part S.

[0027] [3] Third step Next, as shown in FIG. 2, a detection unit 6 is attached to the water retention unit 2, and a nutritional component adjusting unit (treatment unit) 5 is connected to the water retention unit 2. In this state, in the third step, the detection unit 6 detects the state of the second root R2 or the state of the surrounding environment of the second root R2. As described above, the detection result in the third step is preferably at least one detection value selected from the group consisting of impedance, pH, ion concentration, nitrogen source concentration, water concentration, carbon dioxide concentration, active oxygen concentration, plant hormone concentration, volatile organic compound concentration, dye concentration, and nucleic acid concentration, or a change in the detection value over time. The detection unit 6 transmits the test results via the transmission device 62 to the nutritional component adjustment unit 5 or the control unit described above.

[0028] [4] Fourth step Next, in the fourth step, the nutrient component adjusting unit 5 adjusts the amount of the nutrient component required for the growth of the plant P to be supplied via the second root R2 based on the detection result in the third step. For example, the nutrient component adjusting unit 5 determines whether the plant P is lacking or oversupplied with nutrients based on detected values ​​such as a predetermined ion concentration or pH value or their changes over time, and increases or decreases the amount of nutrient components supplied to the plant P. This allows the plant P to grow appropriately. As a result, the quality (taste), number, size, etc. of the fruits that can be harvested can be controlled according to the season.

[0029] The nutritional component adjuster 5 may generate suggestive information based on the detected value or its change over time and a pre-established trained model. The suggestive information is information on the type of treatment for the plant P. Here, the trained model is a model that has been trained to be able to output suggestive information based on a predetermined detected value or its change over time. The trained model may be constructed by a learning method such as supervised learning, unsupervised learning, or self-supervised learning. The trained model may also include, as artificial intelligence, a model capable of general-purpose natural language processing, such as a large language model (LLM) trained on a huge amount of data.

[0030] The above-described functions of the nutritional component adjuster 5 are executed by a computer or processor built into the nutritional component adjuster 5. Furthermore, the nutritional component adjuster 5 may be connected to an external computer (for example, the control unit) via the Internet. In this case, the nutritional component adjuster 5 may transmit data to the external computer, and cause the external computer to generate a trained model or output suggestive information from the trained model. In the above embodiment, the water supplying section 4 and the nutritional component adjusting section 5 are configured separately, but they may also be integrated.

[0031] The treatment unit is not limited to the nutrient component adjusting unit 5 that adjusts the amount of nutrient components necessary for the growth of the plant P to be supplied via the second root R2 based on the detection result in the third step. For example, the treatment unit may adjust the amount of water supplied to the plant body P through at least one of the first root R1 and the second root R2 in the fourth step based on the detection results in the third step. Furthermore, the treatment unit may adjust the amount of light to be irradiated onto the plant body P in the fourth step based on the detection result in the third step. Furthermore, the treatment unit may supply, in a fourth step, a drug to the plant body that controls the pathogen that has infected the plant body, based on the detection result in the third step. Furthermore, it may be provided in the following aspects.

[0032] (1) A method for cultivating a plant, comprising: a first step of preparing a plant having first roots in the ground; a second step of inducing second roots in a portion of the above-ground part of the plant; a third step of detecting the condition of the second roots or the condition of the environment surrounding the second roots; and a fourth step of applying a predetermined treatment to the plant based on the detection results in the third step.

[0033] (2) A method for cultivating a plant body according to (1) above, wherein the detection result in the third step is at least one detection value selected from the group consisting of impedance, pH, ion concentration, nitrogen source concentration, water concentration, carbon dioxide concentration, active oxygen concentration, plant hormone concentration, volatile organic compound concentration, pigment concentration, and nucleic acid concentration, or a change in the detection value over time.

[0034] (3) A method for cultivating a plant body according to (1) or (2) above, wherein in the fourth step, the amount of nutrients necessary for the growth of the plant body to be supplied through the second root is adjusted based on the detection results in the third step.

[0035] (4) A method for cultivating a plant body according to any one of (1) to (3) above, wherein in the fourth step, the amount of water supplied to the plant body through at least one of the first root and the second root is adjusted based on the detection result in the third step.

[0036] (5) A method for cultivating a plant body according to any one of (1) to (4) above, wherein the amount of light irradiated to the plant body is adjusted in the fourth step based on the detection result in the third step.

[0037] (6) A method for cultivating a plant body according to any one of (1) to (5) above, wherein in the fourth step, a drug for controlling a pathogen that has infected the plant body is supplied to the plant body based on the detection result in the third step.

[0038] (7) A method for cultivating a plant body according to any one of (1) to (6) above, wherein in the second step, the plant body is cultivated in a state where a portion of the above-ground part is shaded, in an environment of 30% RH or more and 100% RH or less, or in the presence of moisture, and at a temperature of 15°C or more and 40°C or less.

[0039] (8) A method for cultivating a plant body according to (7) above, wherein in the second step, a moisture-retaining body is placed so as to be in contact with a portion of the above-ground part, and the moisture is supplied to the moisture-retaining body.

[0040] (9) The method for cultivating a plant according to (8) above, wherein in the second step, a part of the above-ground part of the water-retaining structure is covered with a light-shielding film.

[0041] (10) The method for cultivating a plant according to (8) or (9) above, wherein the water-retaining material contains a water-absorbent polymer.

[0042] (11) The method for cultivating a plant according to any one of (1) to (10) above, wherein the above-ground part is a trunk or stem of the plant.

[0043] (12) A cultivation device for a plant having first roots in the ground, comprising: a moisture retention unit that retains moisture around a portion of the above-ground portion of the plant; a moisture supply unit that supplies the moisture to the portion of the above-ground portion through the moisture retention unit, thereby inducing second roots in the portion of the above-ground portion; a detection unit that detects the condition of the second roots or the condition of the environment surrounding the second roots; and a treatment unit that applies a predetermined treatment to the plant based on the detection results by the detection unit.

[0044] (13) The plant cultivation device according to (12) above, further comprising a shading section that shades a portion of the above-ground part.

[0045] (14) The plant cultivation device according to (12) or (13) above, wherein the water supply unit is detachable from the water retention unit.

[0046] (15) The plant cultivation apparatus according to (14) above, wherein the water supply unit is a flying object having a first container for storing the water.

[0047] (16) The plant cultivation device according to any one of (10) to (15) above, wherein the treatment unit is detachable from the water retention unit.

[0048] (17) The plant cultivation device according to (16), wherein the treatment unit is a flying object having a treatment function of performing the predetermined treatment.

[0049] (18) In the plant cultivation device described in (17) above, the flying object further has a first container for storing the water and also functions as the water supply unit. Of course, this is not the case.

[0050] As described above, various embodiments of the present invention have been described, but these are presented as examples and do not limit the scope of the invention in any way. The novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Such embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as set forth in the claims. [Explanation of symbols]

[0051] 1:Cultivation equipment 2: Moisture retention part 21: Holding part body 22: Moisture retainer 3: Light blocking section 4: Moisture supply section 41: First container 42: Tube 43: Pump 5: Nutrition supply section 51: Second container 52: Tube 53: Pump P: Plant body 6: Nutritional component adjustment section 61: Sensor 62: Transmitting device R1: First root R2: Second root S: Ground part UG: Underground

Claims

1. A method for cultivating a plant, comprising: A first step of preparing a plant body having a first root in the ground; a second step of inducing second roots in a portion of the above-ground part of the plant body; a third step of detecting the condition of the second root or the condition of the surrounding environment of the second root; A method for cultivating a plant, comprising a fourth step of applying a predetermined treatment to the plant based on the detection result in the third step.

2. The method for cultivating a plant according to claim 1, A method for cultivating a plant body, wherein the detection result in the third step is at least one detection value selected from the group consisting of impedance, pH, ion concentration, nitrogen source concentration, water concentration, carbon dioxide concentration, active oxygen concentration, plant hormone concentration, volatile organic compound concentration, pigment concentration, and nucleic acid concentration, or a change in the detection value over time.

3. The method for cultivating a plant according to claim 1, A method for cultivating a plant, wherein in the fourth step, the amount of nutrients necessary for the growth of the plant to be supplied through the second root is adjusted based on the detection results in the third step.

4. The method for cultivating a plant according to claim 1, A method for cultivating a plant, wherein in the fourth step, the amount of water supplied to the plant through at least one of the first root and the second root is adjusted based on the detection result in the third step.

5. The method for cultivating a plant according to claim 1, A method for cultivating a plant, comprising adjusting the amount of light to be irradiated onto the plant in the fourth step based on the detection result in the third step.

6. The method for cultivating a plant according to claim 1, A method for cultivating a plant, wherein in the fourth step, a drug for controlling a pathogen that has infected the plant is supplied to the plant based on the detection result in the third step.

7. The method for cultivating a plant according to claim 1, In the second step, the plant body is cultivated in a state where a portion of the above-ground part is shaded, in an environment of 30% RH or more and 100% RH or less, or in the presence of moisture, at a temperature of 15°C or more and 40°C or less.

8. The method for cultivating a plant according to claim 7, In the second step, a water-retaining body is disposed so as to be in contact with a part of the above-ground part, and the water is supplied to the water-retaining body.

9. The method for cultivating a plant according to claim 8, In the second step, a part of the above-ground part of the plant body is covered with a light-shielding film together with the water-retaining body.

10. The method for cultivating a plant according to claim 8, A method for cultivating a plant, wherein the moisture-retaining material contains a water-absorbent polymer.

11. The method for cultivating a plant according to claim 1, A method for cultivating a plant, wherein the above-ground part is a trunk or stem of the plant.

12. A cultivation device for a plant body having a first root in the ground, a moisture retaining portion that retains moisture around a portion of the above-ground part of the plant body; a water supplying unit that supplies the water to the portion of the above-ground portion through the water retention unit, thereby inducing second roots in the portion of the above-ground portion; a detection unit that detects a state of the second root or a state of the surrounding environment of the second root; A plant cultivation device comprising: a treatment unit that applies a predetermined treatment to the plant based on the detection result by the detection unit.

13. The plant cultivation device according to claim 12, The plant cultivation device further comprises a shading section that shades a portion of the above-ground portion.

14. The plant cultivation device according to claim 12, A plant cultivation device, wherein the water supply unit is detachable from the water retention unit.

15. The plant cultivation device according to claim 14, The plant cultivation device, wherein the water supply unit is a flying object having a first container that stores the water.

16. The plant cultivation device according to claim 10, A plant cultivation device, wherein the treatment unit is detachable from the water retention unit.

17. The plant cultivation device according to claim 16, The plant cultivation device, wherein the treatment unit is a flying object having a treatment function of performing the predetermined treatment.

18. The plant cultivation device according to claim 17, The plant cultivation device, wherein the flying object further has a first container for storing the water and also functions as the water supply unit.

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