JP2016032441A - Hydroponics apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hydroponics apparatus capable of lightening labor of work for installing a light-shielding member that constitutes a ground surface part.SOLUTION: A hydroponics apparatus 100 comprises: a cultivation tank 10 configured so as to receive a chunky nutrient accumulation part 3 of root vegetables; an image sensor 7 or an infrared sensor 17 as a detection part which acquires information regarding the height of a stem 31 extending from the chunky nutrient accumulation part 3; a ground surface part 51 which includes a light-shielding member 45 which can be arranged around the stem 31, and forms an underground space 9A that includes underground parts of the root vegetables integrally with the cultivation tank 10; a drive part 5 which moves the light-shielding member 45 to an area around the stem 31; and a control part 6 which moves the light-shielding member 45 to the drive part 5 when it is specified that the value of the height of the stem 31 has become a predetermined value PV or more based on the information regarding the height of the stem 31 acquired by the detection part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hydroponic cultivation apparatus for growing root vegetables without using soil.

  Conventionally, rootless vegetables, for example, potato medium-less seedling and cultivation, that is, seedling and cultivation without using any medium such as soil and sponge have been performed. In the raising and cultivation of root vegetables, when light is irradiated to the underground part of root vegetables, for example, the elongation of Stron from the underground part is hindered. Therefore, the growth of a new tuber derived from the tuber as an example of the massive nutrient accumulating unit is inhibited. Therefore, at the stage where the stem continues to extend from the tuber, a light shielding member constituting the ground surface portion is installed so as to divide the root vegetables into the ground portion and the underground portion. Thereby, the entrance of light from the ground space where the ground portion exists to the underground space including the underground portion is blocked. As a result, the process from raising seedling to cultivation of root vegetables can be executed in the same hydroponic cultivation apparatus. Techniques relating to this are disclosed in the following Patent Documents 1 and 2.

Japanese Patent Laid-Open No. 5-284864 JP-A-10-113085

  In the conventional hydroponic cultivation apparatus, the light shielding member that constitutes the ground surface is manually installed by an operator. For example, after passing a plant stalk through a through-hole of a plate-like member, in order to suppress the entrance of light from the ground space to the underground space, a flexible foam piece such as a urethane foam piece is provided in the gap between the stalk and the through-hole. An operation of inserting a culture medium having Therefore, according to the conventional hydroponic cultivation apparatus, the operation | work for installation of the light-shielding member which comprises a ground surface part has taken the effort.

  Then, this invention is made | formed in view of the conventional problem mentioned above, The objective is the hydroponic cultivation apparatus which can reduce the effort of the operation | work for installation of the light-shielding member which comprises a ground surface part. Is to provide.

  The hydroponic cultivation apparatus according to the first aspect of the present invention includes a cultivation tank configured to receive a bulk nutrient accumulation unit of root vegetables, and a detection unit that acquires information about the height of a stem extending from the massive nutrient accumulation unit. Including a light shielding member that can be disposed around the stem, and a ground surface portion that forms an underground space that includes the underground portion of the root vegetable together with the cultivation tank, and the light shielding member around the stem And a control unit that moves the light shielding member to the drive unit when the information acquired by the detection unit indicates that the value of the height of the stem is a predetermined value or more. It is equipped with.

  The hydroponic cultivation apparatus according to the second aspect of the present invention includes a cultivation tank configured to receive a bulk nutrient accumulation unit of root vegetables, a light shielding member that can be disposed around the stem, and is integrated with the cultivation tank. A ground surface portion that forms an underground space containing the underground portion of the root vegetable, a drive unit that moves the light shielding member around the stem, and a timer that can start timing based on a predetermined trigger And a control unit that moves the light shielding unit to the drive unit when the timer measures a predetermined time.

  According to the present invention, it is possible to reduce the labor of installation for installing the light shielding member that constitutes the ground surface portion.

It is a schematic diagram of the longitudinal cross-section of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: It is a figure which shows the state in which the light-shielding member is accommodated in the accommodating part. It is a schematic diagram of the longitudinal section of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: It is a figure which shows the state which protruded from the accommodating part so that the light-shielding member might comprise a ground surface part. It is a schematic diagram of the longitudinal cross-section of the accommodating part of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: It is a figure which shows the state which protruded from the accommodating part so that the light-shielding member might comprise a ground surface part. It is a schematic diagram of the cross section of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: It is a figure which shows the state by which the light shielding member is accommodated in the accommodating part. It is a schematic diagram of the cross section of the ground surface part of the 1st example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: It is a figure which shows the state by which the light shielding member was folded and accommodated in the accommodating part. It is a schematic diagram of the cross section of the ground surface part of the 1st example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: The figure which shows the state which protruded from the accommodating part so that the light-shielding member might comprise a ground surface part It is. It is a schematic diagram of the cross section of the ground surface part of the 2nd example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: The figure which shows the state which protruded from the accommodating part so that the light-shielding member might comprise a ground surface part It is. It is a schematic diagram of the cross section of the ground surface part of the 3rd example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: The figure which shows the state which protruded from the accommodating part so that the light-shielding member might comprise a ground surface part It is. It is a schematic diagram of the cross section of the ground surface part of the 4th example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: It is a figure which shows the state by which the light shielding member was folded and accommodated in the accommodating part. It is a schematic diagram of the cross section of the ground surface part of the 4th example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: The figure which shows the state which protruded from the accommodating part so that the light-shielding member might comprise a ground surface part It is. It is a schematic diagram of the cross section of the ground surface part of the 5th example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: The figure which shows the state which protruded from the accommodating part so that the light-shielding member might comprise a ground surface part It is. It is a schematic diagram of the cross section of the ground surface part of the 6th example of the hydroponic cultivation apparatus of embodiment of this invention, Comprising: The figure which shows the state which the light-shielding member moved from the accommodating part so that a ground surface part might be comprised It is. It is a flowchart for demonstrating the height detection process of the 1st example which the control part of the hydroponic cultivation apparatus of embodiment of this invention performs. It is a flowchart for demonstrating the height detection process of the 2nd example which the control part of the hydroponic cultivation apparatus of embodiment of this invention performs. It is a flowchart for demonstrating the height detection process of the 3rd example which the control part of the hydroponic cultivation apparatus of embodiment of this invention performs.

  Hereinafter, the hydroponic cultivation apparatus of embodiment of this invention is demonstrated, referring drawings.

(Structure of hydroponic cultivation equipment)
As shown in FIG. 1 and FIG. 2, the hydroponic cultivation apparatus 100 of the present embodiment is attached to the cultivation tank 10 for storing the nutrient solution 2 for cultivating root vegetables and the upper end of the cultivation tank 10. The structure 20 is provided. The cultivation tank 10 is composed of a non-translucent member that does not transmit light. On the other hand, the structure 20 may be configured by a translucent member that transmits light or may be configured by a non-translucent member that does not transmit light.

  The cultivation tank 10 has a structure that completely blocks light except for the opening at the upper end so that the entrance of light from the outside can be blocked. On the other hand, the structure 20 does not have to have a structure including a space. The structure 20 may be a frame structure.

  In the hydroponic cultivation apparatus 100 of the present embodiment, the structure 20 is configured by a non-light-transmissive member that does not transmit light to the inner space. The cultivation tank 10 and the structure 20 constitute one sealed light shielding space. Therefore, the light source 8 is installed in the internal space of the structure 20. However, when the structure 20 is configured by a light-transmitting member that transmits light, the light source 8 may be installed in the external space of the housing 30 and without installing an artificial light source. Sunlight may be used as the light source.

  As shown in FIGS. 1 and 2, the mounting table 1 is placed on the bottom surface of the cultivation tank 10. On the mounting table 1, a massive nutrient accumulation unit 3 for root vegetables cultivated by the hydroponic cultivation apparatus 100 of the present embodiment is placed. At the stage of raising seedlings, as shown in FIG. 1, the nutrient solution 2 is stored in the cultivation tank 10 up to a position higher than the upper surface of the mounting table 1. Thereafter, at the stage of cultivation in which the light shielding member 45 is disposed around the stem 31, the nutrient solution 2 is reduced to a position lower than the upper surface of the mounting table 1 as shown in FIG. 2. In this cultivation stage, roots 32 extending from the massive nutrient accumulating unit 3 are immersed in the nutrient solution 2.

  Specifically, the bulk nutrient accumulation unit 3 of root vegetables means a portion enlarged by storing tubers, tuberous roots, and other moisture and nutrients. The root vegetables having tubers are potatoes, konjac, etc., and the root vegetables having tuber roots are sweet potatoes or dahlia. In the present embodiment, the massive nutrient accumulating unit 3 is a potato tuber, that is, a seed pod.

  As shown in FIG. 1 and FIG. 2, the drive unit 5 that moves the light shielding member 45 so that the light shielding member 45 is arranged around the stem 31 is located near the upper end of the inner surface of the cultivation tank 10. Is provided. The light shielding member 45 is configured by a plastic bag-like member having high confidentiality. As shown in FIG. 3, a storage unit 4 that stores the light shielding member 45 in a folded state is provided below the drive unit 5. An infrared sensor 17 for detecting the tip of the stem 31 is provided on the inner surface of the drive unit 5 immediately above the boundary line between the storage unit 4 and the drive unit 5.

  As FIG. 3 shows, the hydroponic cultivation apparatus 100 of this Embodiment is provided with the pressure measurement part 43 which measures the pressure of gas. Further, the control unit 6 controls a gas pump as an example of the drive unit 5 so that the pressure measured by the pressure measurement unit 43 is maintained at a value within a predetermined range. Therefore, it is possible to suppress applying an excessive stress load to the root vegetables stem 31 due to the gas pressure in one or more bag-shaped members being too high. In addition, the light shielding member 45 can be brought into close contact with the stem 31 without a gap by finely adjusting the pressure of the gas in the one or more bag-shaped members.

  The drive unit 5 and the storage unit 4 constitute one unit. In plan view, the two units are arranged so as to face each other. The two units constitute a pair of mechanisms. In the whole hydroponic cultivation apparatus 100, as shown in FIG. 4, a plurality of opposing units sandwich a plurality of massive nutrient accumulation units 3 arranged along the longitudinal direction of the hydroponic cultivation apparatus 100, respectively. A pair of mechanisms are arranged in a line. A light shielding auxiliary portion 11 is provided in a region not sandwiched between two opposing units.

  However, the light shielding auxiliary part 11 may not be provided. When the light shielding auxiliary portion 11 is not provided, all of the light shielding members 45 may be disposed adjacent to each other.

  The length in the short direction of the hydroponic cultivation apparatus 100 depends on the overgrowth of the above-ground part of the root vegetables in the cultivation process, but is preferably about 30 cm to 40 cm. The length in the longitudinal direction of the hydroponic cultivation apparatus 100 is approximately 30 to 40 cm for each massive nutrient accumulating unit 3 and can be appropriately changed according to the number of massive nutrient accumulating units 3 accommodated. . A feeding part (not shown) for the nutrient solution 2 is provided at one end in the longitudinal direction of the cultivation tank 10, and a nutrient solution discharge part (not shown) at the other end in the longitudinal direction of the cultivation tank 10. ) Is provided.

  The infrared sensor 17 transmits a signal to the control unit 6 when any of the heights H1 and H2 of the plurality of stems 31 exceeds the height position of the infrared sensor 17 itself. The infrared sensor 17 is disposed in the vicinity of the light shielding member 45 described later and higher than the light shielding member 45. Therefore, the infrared sensor 17 functions as a tip detection unit that detects that the higher one of the plurality of stems 31 extends to a position higher than the height position of the light shielding member 45.

  As shown in FIG. 1 and FIG. 2, an image sensor 7 is provided on the inner side of the structure 20 to acquire an image of the state of extension of the stem 31 from the bulk nutrient accumulation unit 3 of root vegetables. Further, a control unit 6 that receives information from each of the infrared sensor 17 and the image sensor 7 and controls the drive unit 5 is provided inside the structure 20 and below the image sensor 7. The control unit 6 also controls a pump P for feeding the nutrient solution 2 into the cultivation tank 10 through the pipe 12. In the present embodiment, the control unit 6 and the image sensor 7 are both provided inside the structure 20, but may be provided outside the structure 20.

  As shown in FIG. 2, the light shielding member 45 is configured to be disposed around the stem 31. When the light shielding member 45 is arranged around the stem 31, the light shielding member 45 constitutes the ground surface portion 51 together with the light shielding auxiliary portion 11 described later. The ground surface 51 forms an underground space 9 </ b> A that includes the underground portion of the root vegetables together with the cultivation tank 10. The underground space 9A is blocked from entering light from the external space.

  As shown in FIG. 4, the cultivation tank 10 is configured to receive a plurality of massive nutrient accumulation units 3. The ground surface portion 51 includes a light shielding auxiliary portion 11 whose position is fixed with respect to the cultivation tank 10. The ground surface portion 51 includes a plurality of light shielding members 45 respectively corresponding to the plurality of massive nutrient accumulation units 3. The light shielding auxiliary part 11 is disposed between each of the plurality of light shielding members 45 in plan view. According to this configuration, since the light shielding auxiliary portion 11 is a fixed portion, the certainty of light shielding can be improved.

  In the present embodiment, the plurality of massive nutrient accumulating units 3 are accommodated in one large underground space 9 </ b> A surrounded by the four inner surfaces and one bottom surface of the cultivation tank 10 and the lower surface of the ground surface portion 51. Has been. However, the partition wall which spreads from the lower surface of the light shielding auxiliary | assistance part 11 to the bottom face of the cultivation tank 10 is provided between the massive nutrient accumulation parts 3 adjacent to each other, and the multiple massive nutrient accumulation parts 3 are respectively provided in plural dedicated spaces. It may be accommodated.

(Light shielding member)
As shown in FIGS. 3 to 5, the light shielding member 45 is housed in the housing portion 4 in a compact state in which air is removed and folded like a camping air mat. A portion of the light shielding member 45 located in the storage portion 4 is provided with a valve 41 for introducing air into and out of the inside. The light shielding member 45 is a flexible bag-like member preliminarily coated with a light shielding paint, and is made of a highly confidential member such as a plastic bag. The driving unit 5 is provided with a gas pump, and the gas pump can fill the light shielding member 45 with a gas, for example, air, or can extract the gas from the light shielding member 45. Therefore, the light shielding member 45 expands when the gas is filled, and contracts when the gas is extracted.

  The light shielding member 45 according to the present embodiment is changed by the drive unit 5 from the state stored in the storage unit 4 shown in FIG. 5 to the state protruding from the storage unit 4 shown in FIG. . Thereby, the light shielding member 45 moves so as to be arranged around the stem 31. As a result, as shown in FIG. 6, the stem 31 is sandwiched between the light shielding members 45. Since the light shielding member 45 is formed of a flexible bag-like member, the light shielding member 45 is elastically deformed to match the shape of the stem 31. Therefore, the stem 31 is not adversely affected by the pressing force from the light shielding member 45. At this time, it is preferable that no gap is formed between the stem 31 and the light shielding member 45 and between the light shielding members 45. However, a gap may be formed between the stem 31 and the light shielding member 45 and between the light shielding members 45 as long as the gap is small enough not to adversely affect the growth of the cultivated root vegetables.

(Example of light shielding member)
As shown in FIG. 5, the two light shielding members 45 are accommodated in the opposing accommodating portions 4. The gas pump as an example of the drive unit 5 sends gas, for example, air, into a bag-shaped member. Accordingly, as shown in FIG. 6, each of the two light shielding members 45 swells when the inside is filled with gas, and is simply extended from one storage unit 4 to the other storage unit 4. Become a beam. According to this simple beam configuration, since both ends of the light shielding member 45 are supported by the storage portion 4, their support state is stable.

(Other examples of light shielding members)
As illustrated in FIG. 7, the light shielding member 45 may be spanned from one storage unit 4 to the other storage unit 4 and may be four simple beams. The larger the number of the plurality of light shielding members 45, the smaller the movement distance of the position of the stem 31 when the stem 31 is sandwiched between the light shielding members 45, so the burden on the stem 31 is smaller.

(Another example of the light shielding member)
Further, as shown in FIG. 8, the four light shielding members 45 are each fixed to the end of one storage portion 4 and extend from one storage portion 4 toward the other storage portion 4. It may be. In this case, the length of one light shielding member 45 in the longitudinal direction can be reduced.

(Other examples of light-shielding auxiliary part)
As illustrated in FIGS. 9 and 10, the light shielding auxiliary unit 11 may have a circular through hole. As shown in FIG. 10, the control unit 6 moves the light shielding member 45 to the drive unit 5 so that the light shielding member 45 extends below the light shielding auxiliary unit 11. Thereby, the circular through hole is closed by the tip portions of the four light shielding members 45. As a result, the ground surface portion 51 is formed by the light shielding member 45 and the light shielding auxiliary portion 11.

  In the structure shown in FIGS. 9 and 10, a light shielding member 45 may be provided so as to extend above the light shielding auxiliary portion 11. According to this, since the light shielding auxiliary part 11 can support the light shielding member 45 from the lower side, the support of the light shielding member 45 is more stable.

(Another example of the light shielding auxiliary part)
As shown in FIG. 11, the light shielding assisting part 11 may be provided with a rail as an example of a guide part 11 </ b> A on the inner surface thereof. In this case, on the side surface of the light shielding member 45 facing the guide portion 11A, a hook portion installed on the curtain rail as an example of the guided portion 111 guided by the guide portion 11A or a slide portion that moves while contacting the rail is provided. It has been. Therefore, since the light shielding member 45 moves while being guided by the guide portion 11A, the moving state is stabilized.

(Modifications of light shielding member and drive unit)
As shown in FIG. 12, the light shielding member 45 may be formed of a sponge or rubber having a fan shape in which a disk is equally divided into four. In this case, the drive unit 5 may move the light shielding member 45 so that the four fan-shaped light shielding members 45 block the circular through holes formed in the light shielding auxiliary unit 11. Also in this case, the sponge or rubber is elastically deformed so as to conform to the shape of the stem 31. Therefore, the light shielding member 45 and the light shielding auxiliary portion 11 form a ground surface portion 51 that can suppress light from entering the underground space 9A. Sponge or rubber has a light-shielding property to such an extent that even if light transmitted through the sponge or rubber is irradiated to the massive nutrient accumulating portion 3, the irradiation of the light does not adversely affect the elongation of strons from the massive nutrient accumulating portion 3. It is desirable that The four fan-shaped light shielding members 45 shown in FIG. 12 may have any shape. Moreover, only the linear part along the radial direction of the four fan-shaped light shielding members 45 shown by FIG. 12 may be comprised with sponge or rubber | gum.

(Light source control)
The hydroponic cultivation apparatus 100 includes a light source that is provided above the light shielding member 45 and controlled by the control unit 6. The controller 6 causes the light source 8 to emit light before and after the light blocking member 45 is moved around the stem 31. According to this, before the light shielding member 45 moves around the stem 31, bath light sprouting can be promoted by irradiating light to the massive nutrient accumulation unit 3 of root vegetables. In addition, after the light shielding member 45 has moved around the stem 31, it is possible to irradiate the ground part of the root vegetables while suppressing the irradiation of the light to the massive nutrient accumulation unit 3. Accordingly, since the stron can grow into a tuber without changing to a ground stalk, the ground part can be subjected to photosynthesis. It can promote hypertrophy. However, the light source 8 may be turned on by a worker who performs hydroponics.

(Control of drive unit example)
An example of the height detection process of the hydroponic cultivation apparatus 100 of the present embodiment will be described using FIG. As shown in FIG. 13, first, in step S1, the control unit 6 determines whether or not the cultivation of root vegetables has been started. For example, the control unit 6 may determine that cultivation has started when a signal indicating that a switch instructing the cultivation start provided in the hydroponic cultivation apparatus 100 has been pressed is received. The control unit 6 is provided with a weight sensor on the mounting table 1, and determines that cultivation has started when a signal indicating that the massive nutrient accumulation unit 3 is placed on the mounting table 1 is received. May be.

  In Step S1, when it is determined that the cultivation has not been started, the control unit 6 repeats the determination process in Step S1 until the cultivation is started. On the other hand, when it is determined in step S1 that cultivation has started, the control unit 6 turns on the light source 8 in step S2. Thereafter, the light source 8 continues to be lit until the cultivation is completed. Therefore, unless the light shielding member 45 is moved by the drive unit 5 and the underground space 9A is formed, a state in which light can be irradiated from the light source 8 to the massive nutrient accumulation unit 3 is always formed.

  Next, in step S <b> 3, the height of the stem 31 is detected by the image sensor 7. At this time, when the plurality of massive nutrient accumulating units 3 are accommodated in the cultivation tank 10, the height of the stem 31 extending from each of the plural massive nutrient accumulating units 3 is detected by one image sensor 7. . Next, in step S4, the height H1 of the stem 31 is compared with the predetermined value PV. In step S4, if the height H1 of the stem 31 is smaller than the predetermined value PV, the detection of the height H of the stem 31 is continued.

  On the other hand, if the height H of the stem 31 is equal to or greater than the predetermined value PV in step S4, the control unit 6 causes the drive unit 5 to move the light shielding member 45 around the stem 31 in step S5. That is, the gas pump is driven, and gas, for example, air is filled from the pump into the bag-shaped member. As a result, the light shielding member 45 changes from the state shown in FIG. 5 to the state shown in FIG. In the state shown in FIG. 6, the light shielding member 45 swells in a state where one or two or more bag-shaped members have a predetermined internal pressure, contact each other so as to press each other, and press the stem 31 with a predetermined pressure. .

  Therefore, until the height H of the stalk 31 reaches the predetermined value PV, it is not hindered that light is applied to the massive nutrient accumulation unit 3 of root vegetables. On the other hand, after the height H of the stalk 31 becomes equal to or greater than the predetermined value PV, it is possible to suppress the irradiation of light to the bulk nutrient accumulation unit 3 of root vegetables. Accordingly, bath light germination can be promoted by irradiating the massive nutrient accumulating unit 3 with light during the seedling stage of root vegetables. Moreover, after the seedling stage of root vegetables, by suppressing the irradiation of the massive nutrient accumulating unit 3 with light, the stron can be satisfactorily extended without changing to a ground stem. Therefore, the new massive nutrient accumulation part 3 can be enlarged from Stron.

  When the detection unit is the image sensor 7, the image sensor 7 acquires the height of the stem 31 as information on the height of the stem 31. In this case, the predetermined value PV to be compared with the height of the stem 31 is set to a value larger than the height of the light shielding member 45 from the reference position.

  A plurality of stems 31 may extend from the massive nutrient accumulation unit 3. In such a case, when the height H1 of the highest stem 31 among the heights H1 and H2 (see FIG. 1) of the plurality of stems 31 is equal to or greater than the predetermined value PV, the control unit 6 performs the driving unit. The light shielding member 45 is moved to 5.

  If the light shielding member 45 is sufficiently flexible and the stem 31 passes through the gap between the light shielding members 45 and the burden on the stem 31 is small, the stem 31 lower than the light shielding member 45 is present. Even if the light shielding member 45 is moved, it is considered that no significant problem occurs. On the other hand, even when the stem 31 cannot pass through the gap between the light shielding members 45, the stem 31 already extending above the light shielding member 45 can perform photosynthesis. Therefore, in any case, if it does not have a particularly great adverse effect on the growth of root vegetables, it can be applied to the cultivation of root vegetables by the hydroponic cultivation apparatus of the present embodiment.

  However, when the image sensor 7 is used, for example, information regarding the position, thickness, and shape of the potato mass nutrient accumulating unit 3, that is, the stem 31 extending from the seed pod can be acquired. Therefore, based on the information acquired by the image sensor 7, the case where the control part 6 can detect the lowest stem height H2 among the several stems 31 is considered. In this case, the control unit 6 may move the light shielding member 45 to the drive unit 5 when the height H2 of the lowest stem 31 is equal to or greater than the predetermined value PV. According to this, after the light shielding member 45 forms the ground surface portion 51 together with the light shielding auxiliary portion 11, the problem that the stem 31 must pass through the gap of the light shielding member 45 and extend above the light shielding member 45 is generated. Can be prevented.

  Next, in step S5, after the gas pump as an example of the drive unit 5 is driven, the pressure of the gas in the bag-shaped member as an example of the light shielding member 45 is measured by the pressure measurement unit 43 (see FIG. 3). In step S <b> 6, the control unit 6 determines whether or not the gas pressure in the bag-like member measured by the pressure measurement unit 43 exceeds the upper limit value. In step S6, when it is determined by the control unit 6 that the pressure of the gas in the bag-shaped member does not exceed the upper limit value, the process of step S8 is executed. On the other hand, if it is determined in step S6 that the pressure of the gas in the bag-shaped member exceeds the upper limit value, the control unit 6 reduces the pressure of the gas sent out by the gas pump in step S7. Thereby, the pressure of the gas in the bag-shaped member is reduced.

  Next, in step S8, the control unit 6 determines whether or not the gas pressure in the bag-like member is below the lower limit value. In step S8, if it is determined by the control unit 6 that the pressure of the gas in the bag-shaped member is not lower than the lower limit value, the process of step S10 is executed. On the other hand, if it is determined in step S8 that the pressure of the gas in the bag-shaped member is below the lower limit value, the control unit 6 increases the pressure of the gas sent out by the gas pump in step S9. Thereby, the pressure of the gas in the bag-shaped member increases.

  The pressure applied from the bag-shaped member to the stem 31 by the above-described processing of Step S6 to Step S9 does not form a gap between the stem 31 and the bag-shaped member, and excessively burdens the stem 31. It is maintained at a value within an appropriate range that is not multiplied.

  Then, in step S10, the control part 6 discriminate | determines whether cultivation was complete | finished. For example, the control unit 6 may determine that the cultivation has ended when it receives a signal indicating that a switch instructing the end of cultivation provided in the hydroponic cultivation apparatus 100 has been pressed. Moreover, when the control unit 6 is provided with a weight sensor on the mounting table 1 and receives a signal indicating that the root vegetables such as the massive nutrient accumulation unit 3 have been removed from the mounting table 1, the cultivation has ended. May be determined.

  In Step S10, while control part 6 has not judged with cultivation having ended, processing of Step S6-Step S10 is repeated. Thereby, the pressure of the gas in the bag-shaped member is maintained at a value between the upper limit value and the lower limit value. In Step S10, when it judges with cultivation having ended, control part 6 makes the pressure of the gas sent out by the gas pump as drive part 5 zero in Step S11. Thereafter, in step S12, the control unit 6 turns off the light source 8. The bag-shaped member is folded by the grower and stored in the storage unit 4. However, when the hydroponic cultivation apparatus 100 includes a folding mechanism that can fold the bag-shaped member, the bag-shaped member may be stored in the storage unit 4 in a state of being folded by the folding mechanism.

(Control of another example of drive unit)
The other example of the height detection process of the hydroponic cultivation apparatus 100 of this Embodiment is demonstrated using FIG. FIG. 14 is different from FIG. 13 only in that steps S3 and S4 in the example of the height detection process surrounded by a dotted line in FIG. 13 are replaced with steps S3A and S4A surrounded by a dotted line in FIG. Is different.

  In another example of the height detection process shown in FIG. 14, an infrared sensor 17 is used as the detection unit. In FIG. 14, in step S <b> 3 </ b> A, the infrared sensor 17 detects the stem 31 when the height H <b> 1 of the stem 31 exceeds the height H <b> 1 of the light shielding member 45. Therefore, the infrared sensor 17 acquires information indicating that the tip of the stem 31 has reached the same height position as the information on the height H of the stem 31.

  A plurality of stems 31 may extend from the massive nutrient accumulation unit 3. In this case, it is detected that the height H1 of the highest stem 31 out of the heights H1 and H2 of the plurality of stems 31 (see FIGS. 1 and 2) exceeds the height of the infrared sensor 17.

  In the case of this example, the control unit 6 receives a signal from the infrared sensor 17 in step S3A, and determines whether or not the infrared sensor 17 as the tip detection unit has detected the tip of the stem 31 in step S4A. doing. In step S4A, when the control unit 6 receives a signal indicating that the infrared sensor 17 has detected the tip of the stem 31, the height H of the stem 31 is determined to be equal to or greater than a predetermined value PV. Thereby, in step S <b> 5, the control unit 6 moves the light shielding member 45 by driving the drive unit 5.

  Even by the above control, when the height of the stem 31 is increased to some extent, the light shielding member 45 is arranged around the stem 31 to suppress the irradiation of the massive nutrient accumulation unit 3 with light. it can.

(Control of yet another example of drive unit)
Still another example of the height detection process of the hydroponic cultivation apparatus 100 of the present embodiment will be described with reference to FIG. FIG. 15 is different from FIG. 13 only in that steps S3 and S4 in the example of the height detection process surrounded by a dotted line in FIG. 13 are replaced with steps S3B and S4B surrounded by a dotted line in FIG. Is different.

  In yet another example of the height detection process shown in FIG. 15, in step S <b> 3 </ b> B, the control unit 6 causes the timer to start measuring time based on a predetermined trigger. Next, in step S4B, the control unit 6 determines whether or not the timer has counted the predetermined time PT. In step S4B, the control unit 6 waits until the timer counts the predetermined time PT. On the other hand, in step S4B, when the timer counts the predetermined time PT, the control unit 6 causes the drive unit 5 to move the light shielding member 45 around the stem 31 in step S5. In the case of using this further example of control, it is necessary to appropriately set a predetermined trigger and a predetermined time PT in advance.

  The predetermined opportunity may be, for example, that the control unit 6 has recognized that a predetermined switch has been turned on after the cultivation worker has put the massive nutrient accumulation unit 3 of root vegetables into the cultivation tank 10. Moreover, the mounting base 1 for mounting the massive nutrient storage part 3 in the cultivation tank 10 is provided, and some sensor which detects that the massive nutrient storage part 3 was mounted on the mounting base 1 May be provided. In this case, the predetermined trigger may be that the control unit 6 has recognized that the sensor has placed the massive nutrient accumulating unit 3 on the mounting table 1.

  Further, the predetermined time PT may be, for example, a time determined in advance by a cultivation worker as a time for the stem 31 to pass the height H position of the light shielding member 45. This predetermined time PT is a time determined in advance by performing an experiment for each root vegetable to be cultivated or based on a past cultivation record for each root vegetable to be cultivated. It is desirable. The predetermined time PT is set to a value at which the height of at least one stalk 31 exceeds the height of the light shielding member 45 and the stron is not yet extended from the massive nutrient accumulation unit 3. It is desirable.

  Even in the control of this further example, bath light germination is promoted during the seedling stage of root vegetables, and a new massive nutrient accumulating unit 3 is formed based on the elongation of stron after the seedling stage of root vegetables. Can be enlarged.

(Control by the operator of the drive unit)
The hydroponic cultivation apparatus 100 includes a predetermined operation unit that is operated by a cultivation worker, and the control unit stems the light shielding member 45 in the drive unit based on a predetermined operation by the cultivation worker of the operation unit. It may be moved around. Also by this, since the cultivation worker can install the light shielding member 45 around the stem 31 only by performing a predetermined operation on the operation unit, the work load is reduced.

(First to fifth examples of the light shielding member)
The light shielding member 45 of the present embodiment includes a flexible member that deforms so as to conform to the shape of the stem 31. In the present embodiment, the flexible member includes a plurality of bag-shaped members filled with gas, as shown in FIGS. Moreover, in this Embodiment, the drive part 5 contains the gas pump which fills each of a some bag-shaped member with gas. Instead of a plurality of bag-shaped members, even if a portion arranged around the stem 31 is divided into a plurality of portions, a single bag-shaped member having one internal space as a whole may be used. Good.

  The bag-shaped member as the light shielding member 45 protrudes inward from the storage portion 4 so as to extend in the horizontal direction like a beam when the gas inside is filled. When a plurality of bag-like members filled with gas project, it is desirable that they come into contact with each other and are in close contact with the periphery of the stem 31. According to this, the light which approachs underground space 9A (refer FIG. 2) can be interrupted | blocked completely. However, a slight gap may be generated between the light shielding members 45 and between the light shielding members 45 and the stem 31 as long as it does not adversely affect the growth of the root vegetables to be cultivated.

  As shown in FIGS. 3, 4, and 5, the light shielding member 45 is folded and stored in the storage unit 4 in a state where the gas is removed. In this state, when the infrared sensor 17 detects the stem 31, the control unit 6 causes a gas pump, which is an example of the drive unit 5, to fill one or more bag-shaped members with gas. Thereby, one or two or more bag-shaped members move around the stem 31. However, when the image sensor 7 detects that the height of the stem 31 is higher than the height of the ground surface portion 51, the control unit 6 adds one or more to the gas pump that is an example of the driving unit 5. A bag-shaped member may be filled with gas.

  According to said structure, the clearance gap between the 1 or 2 or more bag-shaped member and the stem 31 can be made small as much as possible. Therefore, light leakage from the gap between the ground surface portions 51 to the underground space 9A can be suppressed as much as possible. Therefore, it is suppressed that formation of the new massive nutrient accumulation part 3 resulting from trouble in the extension of the stron from the massive nutrient accumulation part 3 is inhibited.

  As shown in FIG. 11, the light shielding assisting part 11 includes a guide part 11 </ b> A configured to guide the light shielding member 45. The light shielding member 45 includes a guided portion 111 configured to move along the guide portion 11A. According to this, the certainty of positioning after movement of the moving part is improved. 11 A of guide parts may be a rail etc., for example. The guided portion 111 may be a slide mechanism such as a hook or a wheel guided to a rail.

(Sixth example of light shielding member)
As shown in FIG. 12, the flexible member constituting the light shielding member 45 is urethane foam (sponge) or rubber that elastically deforms so as to conform to the shape of the stem 31 even when contacting the stem 31. May be. Also in this case, the light shielding member 45 can be prevented from damaging the stem 31.

(Advantages of the hydroponic cultivation apparatus of the present embodiment)
In general, there is no established technique for hydroponics of root vegetables, for example, hydroponics of potato. Therefore, in the hydroponic cultivation of root vegetables, the technique which prevents the irradiation of the massive nutrient accumulation part 3 as an underground part of root vegetables, for example, a seed pod, is not established. Specifically, in hydroponic cultivation of root vegetables, there is no member that blocks light such as soil around the seed pods. Therefore, it tends to be in a state where the light shielding of the underground part of root vegetables, especially tubers, is insufficient. As a result, when the tuber is irradiated with light, the stron does not form a new seed bud by growing as a tuber, but changes to a ground stem. On the other hand, in the initial stage of cultivation, when a member that blocks light irradiation to the tubers is installed in the hydroponic cultivation apparatus 100, there is a light shielding member above the stem, and the stem cannot extend above the light shielding portion. . Therefore, the above-ground part, that is, the leaf cannot be exposed to light, so that photosynthesis cannot be performed.

  According to the hydroponic cultivation apparatus 100 described above, in the seedling raising process, the shoots extending from the tubers are irradiated with light, and in the cultivation process with a stem length of several centimeters or more, only the stems and leaves are irradiated with light. Can be shielded from light. Specifically, the light emitted from the light source 8 is applied to the massive nutrient accumulation unit 3 and the lower part of the stem 31 until the length of the stem (bud) reaches the order of several centimeters from 10 mm or less. After the light shielding member 45 constitutes the ground surface portion 51, the light emitted from the light source 8 is irradiated to the ground portion of root vegetables existing above the light shielding member 45, but is blocked by the light shielding member 45. Therefore, after the length of the stem 31 reaches the order of several centimeters, the light from the light source 8 is suppressed from being irradiated to the underground portion of the root vegetables, that is, the massive nutrient accumulating portion 3, for example, the tubers.

  Moreover, according to said hydroponic cultivation apparatus 100, it is not necessary to provide a some light source so that it may respond | correspond to each of the above-ground part of root vegetables, and the underground part of root vegetables. According to said hydroponic cultivation apparatus 100, it is also possible to use sunlight as a light source instead of an artificial light source. The light source 8 is provided inside the hydroponic cultivation apparatus 100, but may be provided outside the hydroponic cultivation apparatus 100.

  Further, since the bag-shaped member is filled with gas and the bag-shaped member is inflated, the light shielding member 45 is disposed around the stem 31 so that the root vegetables are not excessively stressed. It is possible to always suppress the irradiation of light to the underground part of. This continues until the withering stage when the stem 31 becomes thinner due to atrophy. Therefore, it is possible to execute the seedling raising process and the cultivation process in the same hydroponic cultivation apparatus. In other words, the labor for transplanting the cultivated root vegetables can be reduced, and the roots and the like are prevented from being damaged during the transplantation.

  The configuration of the hydroponic cultivation apparatus 100 according to the embodiment of the present invention and the effects obtained by the configuration are as follows.

  (1) The hydroponic cultivation apparatus 100 of this Embodiment is provided with the cultivation tank 10 comprised so that the massive nutrient storage part 3 of root vegetables might be received. Further, the hydroponic cultivation apparatus 100 includes an image sensor 7 or an infrared sensor 17 as an example of a detection unit that acquires information regarding the height of the stem 31 extending from the massive nutrient accumulation unit 3. The hydroponic cultivation apparatus 100 includes a light shielding member 45 that can be disposed around the stem 31, and includes a ground surface portion 51 that forms an underground space 9 </ b> A that includes the underground portion of the root vegetables together with the cultivation tank 10. Yes. The hydroponic cultivation apparatus 100 includes a drive unit 5 that moves the light shielding member 45 around the stem 31. The hydroponic cultivation apparatus 100 determines that the height value of the stem 31 is greater than or equal to the predetermined value PV based on the information about the height of the stem 31 acquired by the detection unit. The control unit 6 for moving the light shielding member 45 is provided.

  According to the above configuration, the height H of the stalk 31 is set to the predetermined level without preventing light from irradiating the massive nutrient accumulation unit 3 of the root vegetables until the height H of the stalk 31 reaches the predetermined value PV. After the value PV is reached, it is possible to prevent light from being applied to the bulk nutrient accumulation unit 3 of root vegetables. Therefore, in the seedling stage of root vegetables, bath light germination and seedling can be promoted by irradiating the massive nutrient accumulating unit 3 with light. Moreover, after the seedling period of root vegetables, it can irradiate light to the above-ground part of root vegetables, suppressing that the massive nutrient storage part 3 is irradiated with light. Therefore, it is possible to promote the elongation of the stron and the formation of a new massive nutrient accumulating unit 31 based thereon. According to such a hydroponic cultivation apparatus 100, the light shielding member 45 is automatically installed without requiring any work by an operator. For this reason, it is possible to reduce the labor of installing the light shielding member 45 constituting the ground surface portion 51.

  (2) The hydroponic cultivation apparatus 100 of this Embodiment is provided with the cultivation tank 10 comprised so that the massive nutrient storage part 3 of root vegetables might be received. The hydroponic cultivation apparatus 100 includes a light shielding member 45 that can be disposed around the stalk 31 extending from the massive nutrient accumulation unit 3, and forms an underground space 9 </ b> A that includes the underground portion of the root vegetables together with the cultivation tank 10. A ground surface portion 51 is provided. The hydroponic cultivation apparatus 100 includes a driving unit 5 that moves the light shielding member 45 around the stem 31 and a timer that can start timing based on a predetermined trigger, and is driven when the timer counts a predetermined time PT. The unit 5 includes a control unit 6 that moves the light shielding member 45.

  As a precondition of the above configuration, it is necessary to appropriately set a predetermined trigger and a predetermined time PT. Thereby, for the same reason as described above, bath germination and seedling can be promoted during the seedling stage of root vegetables. For the same reason as described above, the growth of the massive nutrient accumulating unit 3 can be promoted based on the elongation of the stron after the seedling stage of the root vegetables. Also with such a hydroponic cultivation apparatus 100, the light shielding member 45 is automatically installed without requiring any work by an operator. For this reason, it is possible to reduce the labor of installing the light shielding member 45 constituting the ground surface portion 51.

  (3) It is desirable that the hydroponic cultivation apparatus 100 includes the light source 8 provided above the light shielding member 45 and controlled by the control unit 6. In this case, it is desirable that the control unit 6 causes the light source 8 to emit light before and after the light shielding member 45 is moved around the stem 31.

  According to said structure, before the light-shielding member 45 moves to the circumference | surroundings of the stalk 31, by irradiating the light emitted from the light source 8 to the bulk nutrient accumulation | storage part 3 of root vegetables, bath light germination and raising seedling are carried out. Can be promoted. In addition, after the light blocking member 45 has moved around the stem 31, the light from the light source 8 is irradiated to the ground portion of the root vegetables while suppressing the irradiation of the light from the light source 8 to the massive nutrient accumulation unit 3. be able to. Thereby, since the above-ground part can carry out photosynthesis in a state where the elongation of the stron from the massive nutrient accumulating unit 3 is not inhibited, the enlargement of the new massive nutrient accumulating unit 3 derived from the massive nutrient accumulating unit 3 is promoted. be able to. Moreover, by using the artificial light source 8, the amount of light irradiated to the root vegetables can be stabilized as compared with the case of using sunlight.

  However, the controller 6 may turn off the light source 8 before the drive unit 5 moves the light shielding member 45 around the stem 31. In either case, the light source 8 may be turned on by a cultivation worker who performs hydroponics.

  (4) It is preferable that the light shielding member 45 includes a flexible member that is elastically deformed so as to conform to the shape of the stem 31. According to this configuration, the light shielding member 45 can be prevented from damaging the stem 31 even when the light shielding member 45 is in contact with the stem 31. The member having flexibility is sponge or rubber. This flexible member is not only elastically deformed so as to be in close contact with each other, but also elastically deformed in conformity with the shape of the stem, so that it is difficult to form a gap between each other and between the stem and the flexible member. Therefore, when using a flexible member, it can prevent reliably that the light which leaked from the clearance gap between light shielding members is irradiated to a basement part.

  (5) It is preferable that the flexible member includes one or more bag-shaped members filled with gas. Moreover, it is preferable that the drive part 5 contains the gas pump which fills gas in the 1 or 2 or more bag-shaped member. In this case, the control unit 6 preferably moves the one or more bag-shaped members around the stem 31 by filling the gas pump with gas in one or more bag-shaped members.

  According to said structure, the clearance gap between the 1 or 2 or more bag-shaped member and the stem 31 can be made small as much as possible. Therefore, light leakage from the gap between the ground surface portions 51 to the underground space 9A can be suppressed as much as possible. Therefore, it is suppressed that formation of the new massive nutrient accumulation part 3 resulting from trouble in the extension of the stron from the massive nutrient accumulation part 3 is inhibited. In this case, the drive unit 5 may be a moving mechanism, and the flexible member may be a sponge that is moved by the moving mechanism.

  (6) It is preferable that the hydroponic cultivation apparatus 100 further includes a pressure measurement unit 43 that measures the pressure of the gas. In this case, it is preferable that the control unit 6 controls the gas pump so that the pressure measured by the pressure measurement unit 43 is maintained at a value within a predetermined range. According to this configuration, it is possible to suppress an excessive stress from being applied to the root vegetables stem 31 due to the gas pressure in the one or more bag-shaped members being too high.

  (7) It is preferable that the cultivation tank 10 is configured to receive a plurality of massive nutrient accumulation units 3. The ground surface part 51 preferably includes at least one light shielding auxiliary part 11 whose position is fixed with respect to the cultivation tank 10 and a plurality of light shielding members 45 respectively corresponding to the plurality of massive nutrient accumulation parts 3. . According to this configuration, light shielding can be performed more reliably by using at least one light shielding auxiliary unit 11. The at least one light shielding auxiliary part 11 and the plurality of light shielding members 45 cooperate with each other to shield the underground space 9 </ b> A containing the plurality of massive nutrient accumulating parts 3. In this case, it is preferable that at least one light shielding auxiliary portion 11 is disposed between each of the plurality of light shielding members 45 in plan view.

  (8) It is preferable that at least one light shielding auxiliary portion 11 includes at least one guide portion 11A configured to guide the light shielding member 45, respectively. Each of the plurality of light shielding members 45 preferably includes a guided portion 111 configured to move along at least one guide portion 11A.

  According to said structure, the certainty of the positioning after the movement of a movement part improves. 11 A of guide parts may be a rail etc., for example. The guided portion 111 may be a slide mechanism such as a hook or a wheel guided to a rail.

  (9) It is preferable that the cultivation tank 10 is configured to receive a plurality of massive nutrient accumulation units 3. The ground surface part 51 preferably includes a plurality of light shielding members 45 respectively corresponding to the plurality of massive nutrient accumulating parts 3. It is preferable that the image sensor 7 or the infrared sensor 17 as the detection unit can independently acquire information on the height of the stem 31 extending from each of the plurality of massive nutrient accumulation units 3. In this case, it is preferable that the control unit 6 independently controls each of the plurality of light shielding members 45 in accordance with the information regarding the height of the stem 31 extending from each of the plurality of massive nutrient accumulation units 3. According to this, the underground space 9 </ b> A shielded by the light shielding member 45 can be formed at a timing suitable for the degree of growth of the individual massive nutrient accumulating unit 3.

  In this case, a light shielding auxiliary part 11 as a partition wall may be provided between the adjacent massive nutrient accumulating parts 3. Thereby, when the light shielding member 45 becomes a part of the ground surface portion 51, a plurality of underground spaces 9A in which light entry is blocked by the light shielding auxiliary portion 11 and the light shielding member 45 as partition walls are formed. Also good.

  In addition, when there is no partition wall between the adjacent massive nutrient accumulating units 3, all of the plurality of light shielding members 45 are arranged around the stem 31 of the corresponding massive nutrient accumulating unit 3 all at once. You may move as follows. Accordingly, the plurality of light shielding members 45 can be controlled by one detection unit.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

DESCRIPTION OF SYMBOLS 3 Mass nutrient storage part 5 Drive part 6 Control part 7 Image sensor 9A Underground space 10 Cultivation tank 11 Shading assistance part 11A Guide part 17 Infrared sensor 31 Stem 43 Pressure measurement part 45 Light shielding member 51 Ground surface part 100 Hydroponic cultivation apparatus 111 Covered Guide part PV Predetermined value H1, H2 Height

Claims (9)

A cultivation tank configured to accept a bulk nutrient accumulation section of root vegetables;
A detection unit for acquiring information on the height of a stem extending from the massive nutrient accumulation unit;
Including a light-shielding member that can be arranged around the stem, and a ground surface part that forms an underground space that includes the underground part of the root vegetables together with the cultivation tank;
A drive unit for moving the light shielding member around the stem;
When it is specified that the value of the height of the stem is equal to or greater than a predetermined value based on the information about the height of the stem acquired by the detection unit, the light shielding member is moved to the drive unit A hydroponic cultivation apparatus comprising a control unit. A cultivation tank configured to accept a bulk nutrient accumulation section of root vegetables;
Including a light-shielding member that can be arranged around a stem extending from the massive nutrient accumulating portion, and a ground surface portion that forms an underground space that includes the root portion of the root vegetable together with the cultivation tank;
A drive unit for moving the light shielding member around the stem;
A hydroponic cultivation apparatus comprising: a timer that can start timing based on a predetermined opportunity, and a control unit that moves the light shielding member to the drive unit when the timer counts a predetermined time. A light source provided above the light shielding member and controlled by the control unit;
The hydroponic cultivation apparatus according to claim 1 or 2, wherein the control unit causes the light source to emit light before and after the light shielding member is moved around the stem.   The hydroponic cultivation apparatus in any one of Claims 1-3 containing the flexible member which elastically deforms so that the said light-shielding member may match the shape of the said stem. The flexible member includes one or more bag-shaped members filled with gas,
The drive unit includes a gas pump that fills the gas into the one or more bag-shaped members,
The said control part moves the said 1 or 2 or more bag-shaped member to the circumference | surroundings of the said stem by making the said gas pump fill the said gas to the said 1 or 2 or more bag-shaped member. Hydroponics equipment. A pressure measuring unit for measuring the pressure of the gas;
The hydroponic cultivation apparatus according to claim 5, wherein the control unit controls the gas pump so that the pressure measured by the pressure measurement unit is maintained at a value within a predetermined range. The cultivation tank is configured to receive a plurality of the massive nutrient accumulation units,
The ground surface portion includes at least one light shielding auxiliary portion whose position is fixed with respect to the cultivation tank, and a plurality of the light shielding members respectively corresponding to the plurality of massive nutrient accumulating portions. The hydroponic cultivation apparatus in any one of. Each of the at least one light shielding auxiliary portion includes at least one guide portion configured to guide the light shielding member;
8. The hydroponic cultivation apparatus according to claim 7, wherein each of the plurality of light shielding members includes a guided portion configured to move along the at least one guide portion. The cultivation tank is configured to receive a plurality of the massive nutrient accumulation units,
The hydroponic cultivation apparatus includes a plurality of the light shielding members respectively corresponding to the plurality of massive nutrient accumulation units,
The detection unit can independently acquire information on the height of the stem extending from each of the plurality of massive nutrient accumulation units,
The hydroponic cultivation apparatus according to claim 1, wherein the control unit independently controls each of the plurality of light shielding members according to information on a height of a stem extending from each of the plurality of massive nutrient accumulation units. .

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