JP2018174841A - Elevated cultivation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevated cultivation device capable of further promoting growth of a plant.SOLUTION: An elevated cultivation device for cultivating a plant on a medium in an elevated place comprises; a medium holding part for holding a medium; a liquid tank for storing a liquid to be supplied to a medium; a compression dissolution mechanism for compressing and dissolving a gas including oxygen into the liquid stored in the liquid tank; and a discharge tube for discharging the liquid to which the gas is compressed and dissolved by the compression dissolution mechanism to the medium, in which the compression dissolution mechanism comprises: a pipe for liquid extraction for extracting the liquid from the liquid tank; a pump for sucking the liquid in the liquid tank to the pipe for liquid extraction; a gas taking pipe for taking a gas including oxygen to the liquid in the pipe for liquid extraction; and a compression dissolution tank which is connected to the pipe for liquid extraction, and which compresses the liquid to which the gas from the gas taking pipe is mixed, for compressing and dissolving the gas.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-level cultivation apparatus for high-level cultivation of plants.

  BACKGROUND ART Conventionally, a high-level cultivation apparatus for high-level cultivation of plants has been disclosed (see, for example, Patent Document 1).

  The configuration of Patent Document 1 relates to a holding sheet used for a bench (medium holding unit) for holding a medium at the time of high-level cultivation of a plant.

Unexamined-Japanese-Patent No. 2015-228824

  On the other hand, in the high-level cultivation apparatus, it is considered important to be able to further promote the growth of plants. There is a need for the development of techniques that can further promote the growth of plants, including high-level cultivation devices as disclosed in Patent Document 1.

  Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a high-level cultivation apparatus capable of further promoting the growth of plants.

  In order to achieve the above object, the high-level cultivation apparatus of the present invention is a high-level cultivation apparatus for high-level cultivation of a plant with a culture medium, and a culture medium holding unit for holding a culture medium, A liquid tank for storing water, a pressure dissolution mechanism for pressure-dissolving a gas containing oxygen in the liquid stored in the liquid tank, and water spouting the liquid in which the gas is pressure-dissolved by the pressure dissolution mechanism The pressure dissolution mechanism includes: a liquid extraction pipe for extracting liquid from the liquid tank; a pump for sucking out the liquid in the liquid tank to the liquid extraction pipe; and the pump A gas intake pipe for taking in a gas containing oxygen to the liquid of the pipe, and the liquid extraction pipe are connected, and the liquid mixed with the gas from the gas intake pipe is pressurized to dissolve the gas under pressure With pressure dissolution tank Provided.

  ADVANTAGE OF THE INVENTION According to this invention, the high-level cultivation apparatus which can promote the growth of a plant can be provided.

Schematic of the high-level cultivation apparatus of the embodiment (before attachment of the pressure dissolution mechanism) Schematic of the high-level cultivation apparatus of an embodiment (after attachment of a pressure dissolution mechanism) Top view of the medium holder and the spout tube Schematic of the high-level cultivation device in a modification

  Hereinafter, an embodiment according to the present invention will be described in detail based on the drawings.

Embodiment
FIG. 1, FIG. 2 is a figure which shows schematic structure of the height cultivation apparatus 2 in embodiment. FIG. 1 shows a state before the pressure dissolution mechanism 6 is attached to the existing equipment 4, and FIG. 2 shows a state after the pressure dissolution mechanism 6 is attached to the existing equipment 4.

<Overall configuration>
As shown to FIG. 1, FIG. 2, the high-level cultivation apparatus 2 of embodiment is equipped with the existing installation 4 and the pressure dissolution mechanism 6. As shown in FIG. By attaching the pressure dissolution mechanism 6 to the existing equipment 4, the advanced cultivation apparatus 2 shown in FIG. 2 can be configured.

<Existing equipment 4>
The existing facility 4 is a facility for high-level cultivation already installed. As shown in FIG. 1, the existing facility 4 of the present embodiment includes a culture medium holding unit 8, a water discharge tube 10, a liquid tank 11, a liquid supply pipe 12, and a pump 13.

  The medium holding unit 8 is a member for holding a medium (not shown) for cultivating a plant. The culture medium holding unit 8 is, for example, a sponge-like member, and is used in a state of being accommodated in a tank such as a synthetic resin cultivation tank. The culture medium and the culture medium holder 8 in the embodiment are provided to extend along the horizontal direction (longitudinal direction A). The water discharge tube 10 is a tubular member that discharges a liquid such as water to the medium held by the medium holding unit 8.

  A plan view of the medium holding portion 8 and the water discharge tube 10 is shown in FIG.

  As shown in FIG. 3, the culture-medium holding part 8 of this Embodiment is formed in the rectangular shape which has the longitudinal direction A and the transversal direction B in planar view. Above the medium holding unit 8, the water discharge tube 10 is arranged to be folded back in a double manner. Specifically, the water discharge tube 10 includes a first extending portion 10a, a second extending portion 10b, and a third extending portion 10c. The first extending portion 10a and the third extending portion 10c extend along the longitudinal direction A, and their respective ends are connected by the second extending portion 10b. The second extending portion 10 b extends so as to curve 180 degrees from the first extending portion 10 a to the third extending portion 10 c. Thus, the second extension 10b is arranged to turn the water discharge tube 10 at the end in the longitudinal direction A.

  According to such a configuration, the first extension portion 10a and the third extension portion 10c are arranged doubly along the longitudinal direction A, and configured to dually discharge water to the same medium. .

  Referring back to FIGS. 1 and 2, the liquid tank 11 is a reservoir that stores a liquid (for example, water) supplied to the culture medium. The liquid supply pipe 12 is a pipe that supplies the liquid stored in the liquid tank 11 to the water discharge tube 10. The pump 13 is a pump for sucking out the liquid in the liquid tank 11 to the liquid supply pipe 12.

  Although not illustrated, piping or the like for adding liquid fertilizer that promotes the growth of a plant to the liquid in the liquid tank 11 may be provided.

<Pressure dissolution mechanism 6>
Next, the pressure dissolution mechanism 6 will be described. The pressure dissolution mechanism 6 is a mechanism for pressure-dissolving a gas containing oxygen to the liquid stored in the liquid tank 11. As described above, the pressure dissolution mechanism 6 of the present embodiment is configured to be retrofittable to the existing equipment 4. By attaching the pressure dissolution mechanism 6, the dissolved oxygen concentration of the liquid stored in the liquid tank 11 of the existing facility 4 can be improved, and thereby the growth of plants can be promoted.

  As shown in FIGS. 1 and 2, the pressure dissolution mechanism 6 according to the present embodiment includes the liquid extraction pipe 16, the gas intake pipe 17, the pump 18, the pressure dissolution tank 20, and the float chamber 22. And a liquid return pipe 24.

  The liquid extraction pipe 16 is a pipe that extracts the liquid from the liquid tank 11. The upstream end 16a of the liquid extraction pipe 16 is disposed in the liquid of the liquid tank 11 in the state after attachment shown in FIG. That is, the upstream end 16a of the liquid extraction pipe 16 functions as a liquid inlet. On the other hand, the downstream end 16 b of the liquid extraction pipe 16 is connected to a pump 18 described later.

  A gas intake pipe 17 is connected in the middle of the liquid extraction pipe 16. The gas intake pipe 17 is a pipe that takes in a gas (for example, air) containing oxygen into the liquid extraction pipe 16. The pump 18 is a pump for sucking out the liquid of the liquid tank 11 to the liquid extraction pipe 16. The pump 18 of the embodiment is a self-contained pump.

  The pressure dissolution tank 20 is a tank that pressurizes the liquid mixed with the gas supplied from the liquid extraction piping 16 to pressure dissolve the gas. The pressure dissolution tank 20 not only mixes the gas into the liquid but also applies pressure above a predetermined level to pressure dissolve the gas. Such pressure dissolution can significantly improve the concentration of dissolved oxygen in the liquid.

  Although not shown, a member for causing cavitation in the liquid is provided in the pressure dissolution tank 20. By providing such a member to cause cavitation, it is possible to reduce the pressure of the liquid in which the gas is pressurized to generate fine bubbles. That is, the member that causes cavitation functions as a micro bubble generation unit.

  The fine bubbles are bubbles having a diameter of 100 μm or less. The microbubbles include microbubbles (for example, 1 μm to 100 μm in diameter) and nanobubbles (for example, less than 1 μm in diameter). The fine bubbles have different properties from ordinary bubbles, such as long residence time in water, large contact area, and easy chemical reaction. When a liquid containing microbubbles is supplied to the culture medium, oxygen gas in the microbubbles is redissolved in the liquid during the supply process to stably contain dissolved oxygen in the liquid even in a long channel system. It is thought that it can be supplied in a state and can promote the growth of plants.

  The float chamber 22 is a member for discharging the undissolved gas in the pressure dissolution tank 20 to the outside. By providing the float chamber 22, undissolved gas can be released from the float chamber 22 while maintaining the pressure dissolution state in the pressure dissolution tank 20. Thereby, the pressure dissolution mechanism 6 can be operated stably. Although not shown, the float chamber 22 is connected to a discharge port for discharging the gas in the float chamber 22, a valve body that closes the discharge port so as to be able to open and close, and a liquid in the float chamber 22 And a float floating on the surface.

  The liquid return pipe 24 is a pipe for returning the liquid in which the gas is pressure-dissolved in the pressure dissolution tank 20 to the liquid tank 11. The upstream end 24a of the liquid return pipe 24 is connected to the pressure dissolution tank 20, and the downstream end 24b is disposed in the liquid of the liquid tank 11 in the mounted state shown in FIG. That is, the downstream end 24b of the liquid return pipe 24 functions as a liquid supply port.

  By providing the pressure dissolution mechanism 6 having the liquid return pipe 24 and the liquid extraction pipe 16 as described above, the pressure dissolution mechanism 6 can be retrofitted to the existing equipment 4 and a gas containing oxygen can be added to the liquid tank 11. It is possible to construct a circulation line which is pressure-dissolved in liquid.

  When the pressure dissolution mechanism 6 is retrofitted to the existing equipment 4, the upstream end 16 a of the liquid extraction pipe 16 and the downstream end 24 b of the liquid return pipe 24 may be arranged to be immersed in the liquid of the liquid tank 11.

<Operation of the high-level cultivation device 2>
An example of the operation method of the above-mentioned high cultivation device 2 will be described with reference to FIG. In FIG. 2, the flow of liquid is indicated by arrows.

(Step S1)
First, the high-level cultivation apparatus 2 shown in FIG. 2 is prepared. Specifically, as shown in FIG. 1, the pressure dissolving mechanism 6 is retrofitted to the existing equipment 4 already installed. As described above, the upstream end 16 a of the liquid extraction pipe 16 and the downstream end 24 b of the liquid return pipe 24 are disposed in the liquid in the liquid tank 11.

(Step S2)
Next, the pressure dissolution mechanism 6 is operated. Specifically, the liquid in the liquid tank 11 is extracted into the liquid extraction pipe 16 by operating the pump 18. Further, by taking in the gas containing oxygen from the gas intake pipe 17, the gas containing oxygen is mixed with the liquid extracted to the liquid extraction pipe 16.

  In the liquid extraction pipe 16, only the gas is mixed with the liquid, and no pressure dissolution is performed. The liquid flowing through the liquid extraction pipe 16 is passed through the pump 18 to the pressure dissolution tank 20.

(Step S3)
In the pressure dissolution tank 20, the gas mixed with the liquid is pressure-dissolved. Specifically, a predetermined pressure or more is applied to the liquid in which the gas is mixed in a pressure dissolution space (not shown) provided in the pressure dissolution tank 20. Thereby, the gas mixed with the liquid is pressure-dissolved in the liquid. The dissolved oxygen concentration in the liquid can be greatly improved by performing pressure dissolution instead of simple mixing.

  As described above, the pressure dissolution tank 20 is provided with a member that causes cavitation. Thus, it is possible to generate fine bubbles in the liquid in which the gas is pressure-dissolved. This produces a liquid containing fine bubbles. Thereafter, the liquid is returned to the liquid tank 11 by passing water through the liquid return pipe 24.

  By continuing the operation of the pressure dissolution mechanism 6 described above, it is possible to pressure-dissolve the oxygen-containing gas sequentially in the liquid in the liquid tank 11 to continuously improve the concentration of dissolved oxygen in the liquid.

(Step S4)
Next, the pump 13 of the existing facility 4 is operated. By the operation of the pump 13, the liquid having the increased dissolved oxygen concentration stored in the liquid tank 11 is sucked into the liquid supply pipe 12. The sucked liquid is supplied to the downstream water discharge tube 10 and is discharged from the water discharge tube 10 to the medium.

  The liquid discharged from the water discharge tube 10 to the culture medium has a high dissolved oxygen concentration, and thus can promote plant growth. In addition, since the liquid discharged to the culture medium contains fine bubbles, the growth of plants can be further promoted.

  Here, the liquid discharged from the water discharge tube 10 loses dissolved oxygen as it proceeds to the downstream side. Therefore, the concentration of dissolved oxygen in the liquid gradually decreases, while the discharge tube 10 is folded back at the end in the longitudinal direction A, as described with reference to FIG. It is arranged to spout double against. Such arrangement of the water discharge tube 10 enables the liquid to be supplied to the culture medium while making the dissolved oxygen concentration uniform.

<Operation and effect>
As described above, the high-level cultivation apparatus 2 of the embodiment is a high-level cultivation apparatus 2 for high-level cultivation of a plant in a culture medium, and the pressure dissolution mechanism 6, the culture medium holding unit 8, and the water discharge tube 10 and a liquid tank 11 are provided. The pressure dissolution mechanism 6 pressure-dissolves a gas containing oxygen in the liquid stored in the liquid tank 11. The medium holding unit 8 holds the medium, the water discharge tube 10 discharges the liquid in which the gas is pressure dissolved by the pressure dissolution mechanism 6 into the medium, and the liquid tank 11 stores the liquid supplied to the medium It is.

  The pressure dissolution mechanism 6 further includes a liquid extraction pipe 16, a gas intake pipe 17, a pump 18, and a pressure dissolution tank 20. The liquid extraction pipe 16 is a pipe that extracts the liquid from the liquid tank 11. The gas intake pipe 17 is a pipe that takes in a gas containing oxygen into the liquid of the liquid extraction pipe 16. The pump 18 is a pump for sucking out the liquid of the liquid tank 11 to the liquid extraction pipe 16. The pressure dissolution tank 20 is a tank that pressurizes the liquid mixed with the gas from the gas intake pipe 17 to pressure dissolve the gas.

  According to such a configuration, since the gas containing oxygen is pressure-dissolved in the liquid supplied to the culture medium, the liquid having the improved dissolved oxygen concentration can be supplied to the culture medium, thereby promoting plant growth. be able to. Furthermore, the dissolved oxygen concentration can be greatly improved by dissolving the gas not only by mixing the gas into the liquid but also by "pressure dissolution", and plant growth can be further promoted.

  Moreover, according to the high-level cultivation apparatus 2 of the embodiment, the water discharge tube 10 extends along the longitudinal direction A in which the culture medium extends, and is folded at the end in the longitudinal direction A to double the same culture medium. It is arranged to discharge water. The dissolved oxygen concentration of the liquid discharged from the water discharge tube 10 becomes lower as it goes downstream, but it is possible to supply the medium with the dissolved oxygen concentration of the liquid uniform by folding the water discharge tube and arranging in duplicate. .

  Moreover, according to the high-level cultivation apparatus 2 of the embodiment, the liquid supply pipe 12 for supplying the liquid of the liquid tank 11 to the water discharge tube 10 is further provided, and the pressure dissolution mechanism 6 adds the gas in the pressure dissolution tank 20 It further comprises a liquid return pipe 24 for returning the pressure-melted liquid to the liquid tank 11. By providing such a liquid supply pipe 12 and a liquid return pipe 24, unlike the case where the liquid is supplied directly from the pressure dissolution tank 20 to the culture medium, the existing configuration of the liquid supply pipe 12 and the like is not changed. The pressure dissolution mechanism 6 can be retrofitted to increase the dissolved oxygen concentration of the liquid. Thereby, the convenience can be improved.

  Moreover, according to the high-level cultivation apparatus 2 of the embodiment, the pressure dissolution mechanism 6 further includes the float chamber 22 for discharging the undissolved gas in the pressure dissolution tank 20 to the outside. By providing such a float chamber 22, the undissolved gas can be released from the float chamber 22 while maintaining the pressure dissolution state in the pressure dissolution tank 20, and the pressure dissolution mechanism 6 can be operated stably. can do.

  Moreover, according to the high-level cultivation apparatus 2 of the embodiment, the pressure dissolution mechanism 6 further includes a micro-bubble generating unit that generates a micro-bubble by reducing the pressure of the liquid in which the gas is pressure-dissolved. By providing such a microbubble generation part, it is possible to further promote plant growth.

<Example>
Next, Examples 1 and 2 will be described.

Example 1
A present Example 1 is what carried out the high growth cultivation of the plant on condition of the following using the high equipment cultivation apparatus 2 of embodiment.

(conditions)
Test product: Fukuoka S6 "Amaou"
Test field: Single pipe house Cultivation style: High-level cultivation using synthetic resin cultivation tank as a tank for containing culture medium holding section Cultivation outline: Normal forcing cropping type, late September 2013 fixed planting, temperature control at minimum temperature 8 ° C Liquid stored in the liquid tank 11: Water Gas taken in from the gas intake pipe 17: Air Concentration and amount of liquid fertilizer: 150 ml / day of 3000 times solution of horticultural fertilizer "OK-F-1" (September, 10 Mon, March-May), 2000x solution 100 ml / day per share (November-February)
Dissolved oxygen concentration of liquid supplied to the implementation section: 11 to 12 mg / L
Dissolved oxygen concentration of liquid supplied to target area: 7 mg / L

  As described above, the difference between the "working section" and the "target section" is the concentration of oxygen dissolved in the liquid supplied to the culture medium.

  As a result of experimenting under the above conditions, the results shown in Table 1 below were obtained.

  As can be seen from the results shown in Table 1, it can be seen that the yield of plants is greater in the working section in which the liquid having a high dissolved oxygen concentration is supplied to the culture medium.

(Example 2)
In the second embodiment, a plant is cultivated under the following conditions using the elevated cultivation apparatus 2 of the embodiment.

(conditions)
Test product: Fukuoka S6 "Amaou"
Test field: Single pipe house Cultivation style: High-level cultivation using synthetic resin cultivation tank as a tank for containing culture medium holding section Cultivation outline: Normal forcing cropping type, late September, fixed planting, temperature control at minimum temperature 8 ° C Liquid stored in the liquid tank 11: Water Gas taken in from the gas intake pipe 17: Air Concentration and amount of liquid fertilizer: 150 ml / day of 3000 times solution of horticultural fertilizer "OK-F-1" (September, 10 Mon, March-May), 2000x solution 100 ml / day per share (November-February)
Dissolved oxygen concentration of liquid supplied to the implementation section: 10 to 12 mg / L
Dissolved oxygen concentration of liquid supplied to target area: 2 to 7 mg / L

  As in Example 1, the difference between the "working section" and the "target section" is the concentration of oxygen dissolved in the liquid supplied to the culture medium.

  As a result of experimenting under the above conditions, the results shown in Table 2 below were obtained.

  As can be seen from the results shown in Table 2, it can be seen that the yield of plants is greater in the working section in which the liquid having a high dissolved oxygen concentration is supplied to the culture medium.

  As shown in the results of Examples 1 and 2 described above, it is confirmed that the growth of plants can be promoted by increasing the concentration of dissolved oxygen in the liquid supplied to the culture medium using the advanced cultivation apparatus 2 of the present embodiment. I was able to. In particular, according to the high-level cultivation apparatus 2 of the present embodiment, since the gas containing oxygen is "pressure-dissolved" in the liquid, the concentration of dissolved oxygen in the liquid is improved more than when the gas is simply mixed in the liquid And can promote the growth of plants more.

  As mentioned above, although the present invention was described with the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment. For example, in the above embodiment, the liquid dissolving pipe 6 is provided in the pressurizing and dissolving mechanism 6 and the liquid obtained by pressure-dissolving the gas in the pressurizing and dissolving tank 20 is returned to the liquid tank 11. Not limited to. The liquid obtained by pressure-dissolving the gas in the pressure dissolution tank 20 may be directly supplied to the culture medium without providing the liquid return pipe 24.

  Further, in the above embodiment, the case where a member for causing cavitation in the pressure dissolution tank 20 is provided as the fine bubble generation part for generating the gas dissolved under pressure as a fine bubble in the liquid has been described. It is not limited to such a case. Any minute bubble generating portion may be used as long as it is a member that can generate pressurized and dissolved gas as fine bubbles (for example, a nozzle having a large number of minute holes, a pressurized liquid, etc. Depressurize under atmospheric pressure to generate fine bubbles, etc.).

  Moreover, although the said embodiment provided the member which produces a cavitation inside the pressure dissolution tank 20 and demonstrated the case where a micro bubble was produced, it does not restrict to such a case. A micro bubble may not be generated without providing a member that causes cavitation.

  Moreover, although the case where the pump 18 of the pressurizing and dissolving mechanism 6 is self-contained has been described in the above embodiment, the invention is not limited to such a case, and a non-self-contained pump may be used. An example using a non-self-contained pump is shown in FIG.

  In the high-level cultivation apparatus 30 of the modification shown in FIG. 4, a non-self-contained pump 26 is provided instead of the self-contained pump 18 in the high-level cultivation apparatus 2 shown in FIG. Further, a priming pump 28 is provided at the upstream end 16 a of the liquid extraction pipe 16. About the other structure, since it is the same as that of the high growth cultivation apparatus 2 shown in FIG. 2, description is abbreviate | omitted.

  By providing the priming pump 28 as shown in FIG. 4, the liquid in the liquid tank 11 can be extracted to the liquid extraction pipe 16 even if the pump 26 is not self-contained. Moreover, by making the pump 26 non-self-contained, the high-level cultivation apparatus 30 can be configured at a lower cost than in the case where the self-contained pump 18 is used.

  On the other hand, when the self-contained pump 18 as shown in FIG. 2 is used, a pump for priming is unnecessary, and the number of parts of the high-level cultivation device 2 can be reduced.

  In addition, the effect which each has can be exhibited by combining suitably the arbitrary embodiment of the said various embodiment and modification.

  While the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art. Such variations and modifications are to be understood as included within the scope of the present disclosure as set forth in the appended claims unless they depart therefrom. In addition, changes in combination or order of elements in each embodiment can be realized without departing from the scope and spirit of the present disclosure.

  This invention is applicable if it is a high-level cultivation apparatus for carrying out high-level cultivation of a plant.

2 High-level cultivation apparatus 4 Existing equipment 6 Pressure dissolution mechanism 8 Medium holding unit 10 Water discharge tube 10a 1st extension 10b 2nd extension 10c 3rd extension 11 liquid tank 12 liquid supply piping 13 pump 16 Liquid extraction piping 16a upstream end (liquid intake)
16b downstream end 18 pump 20 pressure dissolution tank 22 float chamber 24 liquid return piping 24a upstream end 24b downstream end (liquid supply port)
A Longitudinal direction B Shortwise direction

Claims (6)

A high-level cultivation apparatus for high-level cultivation of plants with a culture medium,
A medium holding unit that holds the medium;
A liquid tank for storing a liquid to be supplied to the culture medium;
A pressure dissolution mechanism for pressure-dissolving a gas containing oxygen to the liquid stored in the liquid tank;
A water discharge tube for discharging the liquid in which gas is pressure-dissolved by the pressure dissolution mechanism to the medium;
The pressure dissolution mechanism includes a liquid extraction pipe for extracting liquid from the liquid tank, a pump for sucking the liquid in the liquid tank to the liquid extraction pipe, and oxygen in the liquid for the liquid extraction pipe. It has a gas intake pipe for taking in gas, and a pressure dissolution tank connected to the liquid extraction pipe and pressurizing and dissolving the liquid mixed with the gas from the gas intake pipe so as to pressurize and dissolve the gas. , Height cultivation equipment.   2. The water discharge tube according to claim 1, wherein the water discharge tube extends along a longitudinal direction in which the medium extends, and is arranged to double discharge water to the same medium by being folded back at the longitudinal end. High-level cultivation equipment. It further comprises a liquid supply pipe for supplying the liquid in the liquid tank to the water discharge tube,
The high-growth cultivation apparatus according to claim 1 or 2, wherein the pressure dissolution mechanism further includes a liquid return pipe configured to return the liquid in which the gas is pressure-dissolved in the pressure dissolution tank to the liquid tank. The pump of the pressure dissolution mechanism is non-self-contained;
The high cultivation equipment according to any one of claims 1 to 3, wherein a pump for priming water is provided at a liquid intake port for taking in the liquid of the liquid tank in the liquid extraction piping.   The high-level cultivation apparatus according to any one of claims 1 to 4, wherein the pressure dissolution mechanism further includes a float chamber for discharging undissolved gas in the pressure dissolution tank to the outside.   The high-pressure cultivation apparatus according to any one of claims 1 to 5, wherein the pressure dissolution mechanism further includes a microbubble generation unit configured to generate microbubbles by reducing the pressure of the liquid in which the gas is pressurely dissolved.

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