Cultivation system

Abstract

This cultivation system provides a way to maintain a high-humidity environment around the roots of plants, thereby promoting the development of roots in humid conditions. [Solution] The bed body 1 comprises a lower partition plate 3 that defines a lower region SL in the internal space S of the bed body 1 between itself and the bottom surface 1t of the bed body 1 where saltwater W is stored, an upper partition plate 5 that defines an intermediate region SM between itself and the lower partition plate 3 in the internal space S, and also defines an upper region SU between itself and the bed cover 2, a cultivation container 7, and an irrigation unit 8. The cultivation container 7 divides the upper region SU into a first region SU1 where the growing medium M supporting the plant PL is located, and a second region SU2 which is the rest of the area, and has a partition wall with a slit 7x that connects the first region SU1 and the second region SU2. The irrigation unit 8 supplies water to the first region SU1 and / or the second region SU2.

Description

Technical Field

[0001] The present invention relates to a cultivation system for cultivating plants such as crops.

Background Art

[0002] In recent years, due to the influence of abnormal weather and the like, the sea level is also rising. For example, in coastal areas, seawater is invading coastal soil, rivers, and wells, increasing the salt concentration in water and soil, making it difficult to cultivate plants such as vegetables and flowers. Therefore, there is a current demand for a technology that enables plant cultivation even in water and soil containing salt.

[0003] Here, for example, in Patent Document 1, the space in the cultivation bed is partitioned into an upper region and a lower region, and humid air roots are generated in the upper region, and the water (almost pure water) evaporated from the salt water in the lower region is absorbed by the humid air roots, thereby enabling plant cultivation while avoiding the adverse effects of salt water on growth. A technology is disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, the above-mentioned humid air roots are an important adaptation mechanism for plants to survive in a high-humidity environment when sufficient water absorption from the medium is insufficient and the humidity in the air is high. In humid air roots, more root hairs are developed compared to normal roots (such as roots in soil), and thus water and nutrients can be efficiently absorbed. Therefore, in order to promote the development of humid air roots, it is necessary to keep the environment around the humid air roots at a high humidity. In this regard, the sealing performance between the cultivation bed and the cover in the device described in Patent Document 1 is not sufficient, and there is room for improvement in the technology for maintaining a high-humidity state in the upper region.

[0006] Therefore, the present invention provides a cultivation system that can maintain a high humidity environment around the roots of plants and maximize the promotion of root development in humid conditions. [Means for solving the problem]

[0007] A cultivation system according to one aspect of the present invention comprises a container-shaped bed body having an opening at the top, a bed cover provided to cover the opening of the bed body and having a cover through hole in which a plant is placed, and defining an internal space inside the bed body, a lower partition plate portion that divides the internal space vertically and has a lower root passage hole through which the plant's roots can pass, and defines a lower region between the bottom surface of the bed body and the internal space where salt-containing water or nutrient solution (hereinafter referred to as main nutrient solution) is stored, and the lower partition plate portion divides the internal space vertically and the plant's roots The bed cover comprises an upper partition plate having an upper root passage hole through which the plant can pass, defining an intermediate region between it and the lower partition plate in the internal space, and defining an upper region between it and the bed cover; a partition wall that divides the upper region into a first region where a growing medium supporting the plant placed in the cover penetration hole or a nutrient solution in which the roots of the plant are immersed (hereinafter referred to as a growing medium substitute nutrient solution) is located, and a second region which is the region other than the first region, and a region communication hole formed therein that connects the first region and the second region; and an irrigation section that supplies water to the first region and / or the second region.

[0008] The above cultivation system comprises a cultivation container that constitutes the partition wall and contains the culture medium or a nutrient solution substitute for the culture medium, the cultivation container being separate from the bed cover and the bed body, and placed on the upper partition plate through the cover through-hole.

[0009] The above cultivation system may further include an upper water-retaining mat provided on the upper partition plate in the upper region, which has water retention properties and root permeability that allows the roots of the plants to pass through.

[0010] The above cultivation system further comprises a lower water-retaining mat provided on the lower partition plate in the intermediate region, which has water retention properties and root permeability that allows the roots of the plants to pass through, wherein the lower water-retaining mat and the upper water-retaining mat are made of the same material, and the lower water-retaining mat may be thinner than the upper water-retaining mat.

[0011] The above cultivation system further comprises a lower water-retaining mat provided on the lower partition plate section, which has water-retaining properties and root-permeability that allows the roots of the plants to pass through, and the lower water-retaining mat may have a greater supply of water per unit time to the internal space compared to the upper water-retaining mat.

[0012] In the above cultivation system, the water level of the salt-containing water or the main nutrient solution in the lower region may be located below the lower surface of the lower partition plate.

[0013] The above cultivation system may further include a water temperature control device for controlling the temperature of the water containing salt or the main nutrient solution.

[0014] The above cultivation system may further include a vibration-applying unit in the lower region that applies vibration to the water containing salt or the main nutrient solution.

[0015] The above cultivation system may further include a bubble generating unit that incorporates bubbles into the salt-containing water or the main nutrient solution.

[0016] The above cultivation system may further include a cover sheet provided on the underside of the bed cover, made of a material with a higher thermal conductivity than the bed cover. [Effects of the Invention]

[0017] According to the cultivation system described above, it is possible to maintain a high humidity level in the space around the roots of plants in humid conditions, thereby maximizing the development of humid roots. [Brief explanation of the drawing]

[0018] [Figure 1] A longitudinal sectional view of a cultivation system according to an embodiment of the present invention. [Figure 2] A view of the cultivation system seen from above, which is a view taken in the direction of arrow I in FIG. 1. [Figure 3] A top view showing the upper partition plate portion and the lower partition plate portion of the cultivation system. [Figure 4] A reference diagram (photo) showing the state of actual occurrence of moisture in roots.

Embodiments for Carrying Out the Invention

[0019] (Overall Configuration) As shown in FIG. 1, the cultivation system 100 is installed in a place where the cultivation environment can be adjusted, such as inside a greenhouse or a plant factory, and is a device for cultivating plants PL. Specifically, the cultivation system 100 includes a bed main body 1 having an opening 1x formed upward, a bed cover 2 covering the opening 1x of the bed main body 1, a lower partition plate portion 3 provided on the bed main body 1, a lower water retention mat 4, an upper partition plate portion 5, an upper water retention mat 6, a cultivation container 7, and a watering portion 8 for supplying water to the plants PL. (Bed Main Body)

[0020] The bed main body 1 has a container shape with its internal space S exposed upward through the opening 1x, and is formed of a material such as foamed styrene having heat insulation properties. The material of the bed main body 1 is not particularly limited. Also, as shown in FIG. 2, the bed main body 1 has an elongated shape extending in the horizontal direction (the direction toward the paper surface of FIG. 1) so that a plurality of plants PL can be arranged side by side in a row (two or more rows may be possible). When cultivating plants PL, a plurality of these bed main bodies 1 are arranged and used inside a greenhouse or a plant factory. In FIG. 2, the plants PL are not shown in order to make the structure of the cultivation system 100 easier to visualize.

[0021] (Bed Cover) Returning to FIG. 1, the bed cover 2 is plate-shaped and is detachably provided on the upper part of the bed body 1, thereby defining the above internal space S between the bed cover 2 and the bed body 1. The material of the bed cover 2 is not particularly limited, but for example, styrofoam having heat insulation properties similar to those of the bed body 1 may be used. A plurality of cover through-holes 2x through which plants PL are respectively arranged together with cultivation containers 7, which will be described in detail later, are formed at intervals in the longitudinal direction of the bed body 1 in the bed cover 2.

[0022] Here, between the bed cover 2 and the bed body 1, a cover sheet 10 is provided on the lower surface 2a of the bed cover 2 so as to cover the opening 1x of the bed body 1. The outer edge portion 10a of the cover sheet 10 is disposed outside the bed body 1 so as to face the outer surface of the bed body 1, and the cover sheet 10 is provided so as to cover the bed body 1 from the outside. Further, a sheet through-hole 10x having approximately the same size as the cover through-hole 2x is formed in the cover sheet 10 at a position corresponding to the cover through-hole 2x of the bed cover 2. The cover sheet 10 is made of a material having a higher thermal conductivity than the bed cover 2. As the material of the cover sheet 10, for example, a metal material having a high thermal conductivity such as aluminum or copper is preferably used. Also, it is not necessary for the entire cover sheet 10 to be formed of a material such as aluminum or copper, and a vapor deposition film or the like provided with a coating of aluminum or copper on the surface may be used for the cover sheet 10.

[0023] (Lower partition plate portion) The lower partition plate section 3 is positioned in the internal space S of the bed body 1 and divides this internal space S vertically. As shown in Figure 3, the lower partition plate section 3 has multiple root passage holes (lower root passage holes) 3x formed therein so that the roots R of the plant PL can pass through. The material of the lower partition plate section 3 is not particularly limited, but it is preferable that it be made of a material that has saltwater resistance or has a saltwater resistance coating on its surface (especially the bottom surface). The lower partition plate section 3 is preferably provided so that it can be attached to the bed body 1. Specifically, for example, a projection (not shown) may be provided on the inner surface of the bed body 1 and the lower partition plate section 3 may be installed on this projection, or it may be placed on the supply pipe 20 described later. Returning to Figure 1, the lower partition plate section 3 defines a lower region SL between itself and the bottom surface 1t of the bed body 1 in the internal space S of the bed body 1.

[0024] The lower region SL stores saline water (hereinafter referred to as brine) W. The saline in brine W may include not only sodium chloride but also other salts such as magnesium chloride, magnesium sulfate, calcium sulfate, and potassium chloride. The salinity (volume percentage concentration) of brine W is not particularly limited. It is also possible to use seawater as brine W or to use diluted seawater. If, for example, seawater diluted 4 to 15 times is used as brine W, it is suitable for cultivating cruciferous vegetables, etc. In this case, considering that the salinity (volume percentage concentration) of seawater is about 3.1% to 3.8%, the salinity (volume percentage concentration) of brine W should be 0.20% to 0.95%, preferably 0.30% to 0.50%, and more preferably 0.40%. A nutrient solution containing fertilizer (main nutrient solution) may be used instead of brine W.

[0025] In the lower region SL, the water surface of the saltwater W is located even lower than the lower surface 3b of the lower partition plate 3, and there is a gap between the lower surface 3b and the water surface. Therefore, an air space AR is formed between the lower surface 3b and the water surface.

[0026] (Water temperature adjustment device) Here, a water temperature control device 15 is installed on the bottom surface 1t of the bed body 1. The water temperature control device 15 is protected from the intrusion of saltwater W by a waterproof cover (not shown). The water temperature control device 15 controls the evaporation rate of saltwater W by adjusting the temperature of saltwater W in the lower region SL. For example, the control device may acquire information on the temperature and humidity of the internal space S and the temperature of the saltwater W from a thermometer and hygrometer, and control the water temperature control device 15 to automatically adjust the temperature and humidity of the internal space S. Preferably, the water temperature control device 15 is composed of a heater for heating the saltwater W, a Peltier cooler for cooling the saltwater W, a cooling fan, etc., so that it can both heat and cool the saltwater W, but it may also be a heater that can only heat the saltwater W.

[0027] (Vibration application section) In the lower region SL, a supply pipe 20 is provided to supply saltwater W. The supply pipe 20 is, for example, a PVC pipe or a metal pipe, and is provided to extend in the longitudinal direction of the bed body 1 (see Figure 2). A pair of supply pipes 20 are provided at intervals in the width direction of the bed body 1, intersecting the longitudinal direction of the bed body 1, and each supply pipe 20 is positioned on the outside in the width direction of the bed body 1. In addition, branch pipes 21, which act as vibration imparting parts, extend inward in the width direction of the bed body 1 from each supply pipe 20. The branch pipes 21 cause the saltwater W from the supply pipes 20 to flow out into the lower region SL. Multiple branch pipes 21 are provided at intervals in the longitudinal direction of the bed body 1 (see Figure 2), and each branch pipe 21 is entirely (or at least partially) placed in the saltwater W and is a flexible rubber or similar tube that can be deformed and moved by the flow of saltwater W. The branch pipes 21 deform and move in response to the flow of saltwater W, thereby imparting vibration to the saltwater W.

[0028] (Circulation device / bubble generation unit) The supply pipe 20 also penetrates the bed body 1 and extends to the outside of the bed body, and is connected to a circulation device 30 that circulates the saltwater W. The circulation device 30 mainly consists of a pump 31 and a bubble generating unit 32 that imparts bubbles (e.g., nanobubbles) to the saltwater W. The bubble generating unit 32 imparts bubbles to the saltwater W by common techniques such as taking in air from the outside and stirring the taken-in air together with the saltwater W.

[0029] (Upper partition plate section) The upper partition plate section 5 is positioned above the lower partition plate section 3 in the internal space S of the bed body 1, creating a vertical division of the internal space S. As shown in Figure 3, the upper partition plate section 5, like the lower partition plate section 3, has multiple root passage holes (upper root passage holes) 5x formed therein to allow the roots R of the plant PL to pass through. In this embodiment, the upper partition plate section 5 is the same as that of the lower partition plate section 3, and it is preferable that it be detachably attached to the bed body 1, similar to the lower partition plate section 3. Returning to Figure 1, the upper partition plate section 5 defines an intermediate region SM between itself and the lower partition plate section 3 in the internal space S, and defines an upper region SU between itself and the bed cover 2. Here, the intermediate region SM is enclosed by the side walls of the bed body 1, the upper partition plate section 5, and the lower partition plate section 3, creating a highly sealed space. Furthermore, since there is no device for directly irrigating the intermediate region SM, there are no water supply pipes or the like connecting the inside and outside of the intermediate region SM. Therefore, moisture enters and exits the intermediate region SM only through the minute gap between the upper partition plate 5 and the side wall of the bed body 1, the minute gap between the lower partition plate 3 and the side wall of the bed body 1, the root passage holes 5x in the upper partition plate 5, and the root passage holes 3x in the lower partition plate 3.

[0030] (Lower water-retaining mat) The lower water-retaining mat 4 is laminated on the lower partition plate 3 in the intermediate region SM so as to cover the entire upper surface 3a of the lower partition plate 3, and is made of a nonwoven fabric, a cloth made from natural or synthetic fibers, or a blend of natural and synthetic fibers, which has moisture permeability, transpiration, water retention, and root permeability that allows plant PL roots R to pass through. The lower water-retaining mat 4 has the function of absorbing and releasing moisture evaporated from the salt water W, and the function of moving the moisture absorbed by the cloth throughout the cloth, and has voids inside that trap moisture. The lower water-retaining mat 4 may be a very thin sheet-like member, or it may be a sheet-like member with a material having moisture absorption, moisture permeability, transpiration, and expandability laminated on its surface.

[0031] (Upper water-retaining mat) The upper water-retaining mat 6 is laminated on the upper partition plate portion 5 so as to cover the entire upper surface 5a of the upper partition plate portion 5 in the upper region SU, and is made of a material such as a nonwoven fabric, a cloth made from natural or synthetic fibers, or a blend of natural and synthetic fibers, which has moisture permeability, transpiration, water retention, and root permeability that allows the roots R of plants PL to pass through. In this embodiment, the lower water-retaining mat 4 and the upper water-retaining mat 6 are made of the same material, and the lower water-retaining mat 4 is thinner than the upper water-retaining mat 6, so the lower water-retaining mat 4 has superior moisture permeability and transpiration, and the amount of moisture supplied from itself to the internal space S per unit time is greater than that of the upper water-retaining mat 6. The "amount of moisture supplied" here includes the amount of moisture (water vapor) that is retained in itself and the amount of moisture (water vapor) that permeates through itself. The upper water-retaining mat 6 may be a very thin sheet-like member, or it may be a sheet-like member with a material having moisture permeability, evaporation, and water retention properties laminated on its surface.

[0032] (Cultivation container) In this embodiment, the cultivation container 7 is a pot. The structure of this pot is not particularly limited, but for example, multiple slits 7x are formed on its side. A growing medium M, such as culture soil, is contained inside the cultivation container 7, and the plant PL is supported by this growing medium M. The cultivation container 7 is separate from the bed cover 2 and the bed body 1, and is placed on the upper partition plate 5 with the upper water-retaining mat 6 sandwiched between it and the upper partition plate 5 through the cover penetration holes 2x of the bed cover 2. When the cultivation container 7 is placed on the upper partition plate 5, the upper end of the cultivation container 7 is positioned above the bed cover 2. As a result, the cultivation container 7 has a partition wall that divides the upper region SU into a first region SU1, which is the area inside the container where the growing medium M is placed, and a second region SU2, which is the area outside the cultivation container 7 other than the first region SU1. Thus, the slits 7x of the cultivation container 7 are region-communicating holes that connect the first region SU1 and the second region SU2.

[0033] (Irrigation section) In this embodiment, the irrigation unit 8 is a pipe for supplying water to the first region SU1 in the upper region SU, and has a culture medium water supply pipe 40 with a water inlet for supplying water to the culture medium M in the cultivation container 7 located above the bed cover 2. Furthermore, the irrigation unit 8 is a pipe for supplying water to the second region SU2, that is, it has a mat water supply pipe 41 with a water inlet for supplying water to the upper water retention mat 6 located above the upper water retention mat 6 in the second region SU2. The irrigation unit 8 is controlled by a control device (not shown), and for example, irrigation is stopped at night.

[0034] (Condition of plant roots) With the above configuration, the roots R of the plant PL functionally differentiate into medium roots (generally called soil roots) R1 in the culture medium M contained in the cultivation container 7, moisture-intensive roots R2 extending from the medium roots R1 to the upper region SU, the intermediate region SM, and the lower region SL through the slits 7x of the cultivation container 7, and underwater roots R3 extending from the moisture-intensive roots R2 into the saltwater W. The underwater roots R3 directly absorb the saltwater W, absorbing not only the water but also the salt (minerals) in the saltwater W. The moisture-intensive roots R2 extend downward from the upper region SU through the intermediate region SM to the lower region SL through the root passage holes 5x in the upper partition plate 5, the upper water-retaining mat 6, the root passage holes 3x in the lower partition plate 3, and the lower water-retaining mat 4. As shown in Figure 4, in a space with a certain level of humidity, the moisture-intensive roots R2 become very densely spread throughout the space, and absorb surrounding moisture (freshwater, pure water) by condensation at the roots.

[0035] (Effects and Benefits) As described above, the cultivation system 100 of this embodiment allows the internal space S defined by the bed body 1 and the bed cover 2 to be divided into three layers by the lower partition plate 3 and the upper partition plate 5, namely the lower region SL, the intermediate region SM, and the upper region SU. Therefore, the intermediate region SM can be made into a more airtight space by being sandwiched between the upper region SU and the lower region SL. As a result, it is possible to suppress the outflow of moisture from the intermediate region SM to the outside of the cultivation system 100, maintain the intermediate region SM in a high-humidity state, and maximize the generation of moisture-containing roots R2 in the intermediate region SM. The moisture-containing roots R2 then function like a desalination device for saltwater W, making it possible to supply sufficient salt-free water to the plant PL through the moisture-containing roots R2.

[0036] Furthermore, since the cultivation container 7 is separate from the bed body 1 and bed cover 2, tasks such as replacing the growing medium M and replanting the plants PL can be made easier, and the cultivation system 100 can be reused repeatedly.

[0037] Furthermore, by providing the upper water-retaining mat 6, it is possible to maintain a high humidity level in the upper region SU, and also to suppress the escape of moisture from the intermediate region SM, thereby further promoting the generation of moisture-containing roots R2 in the intermediate region SM.

[0038] Furthermore, by providing a lower water-retaining mat 4 and making its thickness thinner than that of the upper water-retaining mat 6, the amount of moisture transpiration from the lower water-retaining mat 4 is increased, thereby increasing the amount of moisture supplied to the intermediate region SM per unit time, while the thicker upper water-retaining mat 6 prevents moisture from escaping upward from the intermediate region SM. In particular, when the upper water-retaining mat 6 is water-retaining, the voids in the upper water-retaining mat are filled with moisture, making it difficult for moisture from the intermediate region SM to pass through the upper water-retaining mat 6, which further promotes the generation of moisture-filled roots R2 in the intermediate region SM.

[0039] Furthermore, since the surface of the saltwater W stored in the lower region SL is positioned away from the lower surface 3b of the lower partition plate 3, an air space AR is formed in the lower region SL, allowing moisture-filled roots R2 to spread throughout this lower region SL as well.

[0040] In this case, simply storing saltwater W in the lower region SL may not provide sufficient moisture to the intermediate region SM. However, in this embodiment, a water temperature control device 15 is provided in the bed body 1 to control (heat) the saltwater W, thereby controlling (increasing) the evaporation rate of the saltwater W and maintaining the humidity of the internal space S at an appropriate level, thereby promoting the generation of moisture-induced roots R2. Furthermore, a branch pipe 21 is provided as a vibration-applying section in the supply pipe 20 that supplies saltwater W to the lower region SL, and by applying vibration to the stored saltwater W, the evaporation of saltwater W can be promoted, increasing the humidity of the internal space S and further promoting the generation of moisture-induced roots R2.

[0041] Furthermore, by mixing air into the saltwater W using the bubble generation unit 32, air can be efficiently supplied to the internal space S.

[0042] Furthermore, by providing a cover sheet 10 made of a material with higher thermal conductivity than bed cover 2 on bed cover 2, condensation will occur, for example, when the temperature of the environment in which the cultivation system 100 is installed is lower than the temperature of the internal space S. Therefore, this condensed water can be absorbed by the plant PL as moisture.

[0043] Although embodiments of the present invention have been described in detail above with reference to the drawings, the configurations and combinations thereof in the above embodiments are merely examples, and additions, omissions, substitutions, and other modifications to the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited by the embodiments, but is limited only by the claims.

[0044] For example, the irrigation section 8 is not limited to the form described above, and can be any structure that can supply water to at least the culture medium M or the upper water-retaining mat 6.

[0045] Furthermore, the cultivation container 7 may be integrated with the bed body 1 or the bed cover 2. For example, partition walls may be provided at intervals in the longitudinal direction to divide the upper region SU in the longitudinal direction of the bed body 1, and the culture medium M may be placed in the first region SU1 which is the space between the partition walls. In this case, through holes may be provided in the partition walls as region communication holes instead of the slits 7x of the cultivation container 7.

[0046] Furthermore, the lower water-retaining mat 4 only needs to have a higher rate of moisture supply (moisture release) per unit time to the internal space S compared to the upper water-retaining mat 6, and its water retention capacity may be lower than that of the upper water-retaining mat 6. They may also be made of different materials (fibers). Even if the lower water-retaining mat 4 and the upper water-retaining mat 6 are made of the same material and thickness, the lower water-retaining mat 4 may have a structure with a higher porosity than the upper water-retaining mat 6, thereby making the lower water-retaining mat 4 superior in moisture permeability and evaporation.

[0047] Alternatively, instead of the branch pipe 21, a vibration generating device that vibrates the saltwater W in the lower region SL may be used as the vibration generating unit. The vibration generating device may be an ultrasonic generator that uses ultrasound to vibrate the saltwater W.

[0048] The water temperature control device 15 may be placed in the saltwater W to directly control the temperature of the saltwater W, or it may be located outside the bed body 1 and control the temperature of the saltwater W on the circulation path.

[0049] Furthermore, the intermediate region SM within the internal space S may be divided into multiple layers. In other words, it does not have to be a three-layer structure as described above, but may have a structure of three or more layers.

[0050] Alternatively, a substitute nutrient solution may be placed in the cultivation container 7 instead of the culture medium M. In this case, it is advisable to provide a structure in the cultivation container 7 or bed cover 2, etc., to support the plant PL.

[0051] Alternatively, the upper partition plate section 5 and the lower partition plate section 3 can be made into a tray shape, and soil or solid growing medium can be placed on the upper water-retaining mat 6 and the lower water-retaining mat 4 to encourage the roots R to intertwine, thereby further promoting the development of moist roots R2.

[0052] Furthermore, to promote evaporation from the saltwater W, a device may be provided to irradiate the saltwater W stored in the lower region SL with light. Specifically, for example, a window may be provided in the bed body 1 at the location of the lower region SL, and light may be irradiated from outside the bed body 1 through this window to heat the saltwater W. [Industrial applicability]

[0053] According to the cultivation system of the present invention, it is possible to maintain a high humidity level in the space around the roots of plants in a humid environment, thereby promoting the development of humid roots. [Explanation of Symbols]

[0054] 1…Bed frame 1x…Aperture 2… Bedspread 3…Lower partition plate section 3x…Root passage hole (lower root passage hole) 4…Lower water-retaining mat 5…Upper partition plate section 5x…Root passage hole (upper root passage hole) 6…Upper water-retaining mat 7…Cultivation container 8…Irrigation section 10... Cover sheet 15...Water temperature control device 32... Bubble generation section 100... Cultivation System AR…Air space M…Medium PL…Plant R…root R1...Roots in the culture medium R2...Humidity-resistant roots R3…Underwater roots S…interior space SL…Lower area SM…middle area SU…upper area SU1…first area SU2…Second area W... Saltwater

Claims

1. A container-shaped bed body with an opening formed upwards, A bed cover is provided to cover the opening of the bed body, forming a cover through-hole for plant placement, and defining an internal space inside the bed body. The internal space is divided vertically, and a lower root passage hole is formed through which the plant roots can pass. The lower partition plate defines a lower region between the bottom surface of the bed body and the internal space, where salt-containing water or nutrient solution (hereinafter referred to as the main nutrient solution) is stored. The upper partition plate divides the internal space vertically and has an upper root passage hole through which the plant roots can pass, and defines an intermediate region between the lower partition plate and the internal space, and defines an upper region between the bed cover and the upper partition plate, The upper region is divided into a first region where a culture medium supporting the plant, which is placed in the cover through-hole, or a nutrient solution in which the roots of the plant are immersed (hereinafter referred to as a culture medium substitute nutrient solution), is located, and a second region which is the region other than the first region, and a partition wall is formed which a region communication hole is formed that connects the first region and the second region, An irrigation unit that supplies water to the first region and / or the second region, A cultivation system equipped with the following features.

2. The partition wall is formed and further comprises a cultivation container for containing the culture medium or a nutrient solution that replaces the culture medium, The cultivation system according to claim 1, wherein the cultivation container is separate from the bed cover and the bed body, and is placed on the upper partition plate through the cover through-hole.

3. The cultivation system according to claim 1, further comprising an upper water-retaining mat provided on the upper partition plate portion in the upper region, having water retention properties and root permeability that allows the roots of the plant to pass through.

4. The intermediate region is further provided with a lower water-retaining mat that is placed on the lower partition plate and has water-retaining properties and root-permeability that allows the roots of the plant to pass through. The lower water-retaining mat and the upper water-retaining mat are made of the same material. The cultivation system according to claim 3, wherein the lower water-retaining mat is thinner than the upper water-retaining mat.

5. The lower water-retaining mat is provided on the lower partition plate and has water-retaining properties and root-permeability that allows the roots of the plant to pass through. The cultivation system according to claim 3, wherein the lower water-retaining mat supplies a greater amount of water per unit time to the internal space compared to the upper water-retaining mat.

6. The cultivation system according to any one of claims 1 to 5, wherein in the lower region, the water surface of the salt-containing water or the main nutrient solution is located below the lower surface of the lower partition plate.

7. The cultivation system according to any one of claims 1 to 5, further comprising a water temperature control device for controlling the temperature of the water containing the salt or the main nutrient solution.

8. The cultivation system according to any one of claims 1 to 5, further comprising a vibration-applying unit for applying vibration to the water containing salt or the main nutrient solution in the lower region.

9. The cultivation system according to any one of claims 1 to 5, further comprising a bubble generating unit for introducing bubbles into the salt-containing water or the main nutrient solution.

10. The cultivation system according to any one of claims 1 to 5, further comprising a cover sheet provided on the underside of the bed cover and made of a material with higher thermal conductivity than the bed cover.

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