JPH04197113A - Apparatus for cultivating plant - Google Patents

Abstract

PURPOSE:To adapt conditions of temperature, humidity and light to cultivating conditions by providing the interior of an outer chamber with an inner chamber in a nearly hermetically closed state, installing a cooler and temperature regulators for water storage tanks in the interior of the inner chamber, providing a light shielding enclosure of the outer chamber and irradiating plants in the inner chamber with artificial light. CONSTITUTION:An outer chamber 2 is formed from a light shielding enclosure 16 and lamps 10 are provided to irradiate plants in an inner chamber 3 with light at a required illuminance for a prescribed time. Water in water storage tanks 5 in the inner chamber 3 is regulated with temperature regulators 6 and cold water is passed through cooling pipes 7 in the inner chamber 3. The cold water is then sprinkled from water sprinkling holes 43 in a water sprinkling pipe 42 of a cooler 9 over the ceiling part 27.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention promotes plant growth in a favorable manner by making it possible to control temperature, humidity, and light conditions, which are key to plant cultivation conditions, in a well-balanced manner. The present invention relates to a plant cultivation device that improves productivity and reduces production costs.

[Prior Art and Problems to be Solved by the Invention] Taking the conventional growth of young plants, for example, the growth of grafted seedlings formed by grafting panicles onto rootstocks, in normal cases, the growth of seedlings on a potted stand The idea was to graft the ears onto a tree and then let them grow in a natural environment.

However, in the natural world, there are not only sunny days but also cloudy and rainy days, so the length of sunlight and the intensity of light are not constant, and especially in winter and early spring, the length of daylight is short and parents are weak. For this reason, even in greenhouse cultivation, it has not been possible to control the light, temperature, and humidity conditions necessary for growth in a well-balanced manner to suit each individual plant. Therefore, in the past, there have been problems in that the survival rate of grafted seedlings is poor and that it takes a long time for rooting to take root, resulting in poor productivity of grafted seedlings and an increase in production costs.

The present invention solves the problems by making it possible to control the temperature, humidity, and light conditions in a well-balanced manner, allowing seedlings to grow smoothly, and also making cultivation management during acclimatization and germination reliable and easy. The purpose is to provide a plant cultivation device.

[Means for solving the problem] Plant cultivation device according to the present invention (hereinafter referred to as cultivation device)■
An inner space 3 whose inside is in a substantially sealed state is provided in an outer space 2 formed by a surrounding wall 16 having a light-shielding property, and the inner space 3 has a cover that can be closed for taking plants in and out. A barrier entrance 11 is provided, a water storage tank 5 is installed in the inner cavity 3, and a temperature control device 6 for raising or lowering the temperature of the water in the tank is attached to the water storage tank 5. Inner vacant room 3
A cooling pipe 7 for flowing cold water is disposed inside the inner cavity, and a cooling device 9 is disposed above the inner cavity 3 to cool the interior of the inner cavity 3. The interior is characterized by being provided with an illumination device 10 that irradiates the plants housed in the inner chamber 3 with light of a required illuminance for a certain period of time.

In a more preferred embodiment of the cultivation apparatus 1 according to the present invention, an interior space in which a ceiling part 27 is formed in an arch shape using a translucent material in an outer space 2 formed by a surrounding wall 16 having a light-blocking property. An inner empty chamber 3 is provided in a substantially sealed state,
Closable openings 11a and 11b for taking plants in and out are formed at both ends of the inner chamber 3, and a tray-shaped water storage tank is provided at the bottom of the inner chamber 3 over almost its entire length. 5
The water storage tank 5 is equipped with a temperature control pipe 36 through which a temperature control liquid flows to raise or lower the temperature of the water in the tank, and the upper part of the inner cavity is equipped with cold water. A cooling pipe 7 for flowing water is provided, and the cooling pipe 7 is located slightly above the longitudinal center of the ceiling 27 of the inner cavity 3.
A sprinkler pipe 42 is installed to spray cold water in the left and right direction of the room 7, and above the sprinkler pipe 42 is installed a lighting system that irradiates light at a required intensity for a certain period of time from the translucent ceiling part 27 into the vacant room in a substantially uniform state. Examples include those in which the device 10 is arranged. When configured in this way, the temperature control tube 36 is configured such that its lower approximately 1/2 portion 38 is submerged in the water in the water storage tank 5 and its upper approximately 1/2 portion 39 is exposed in the air. It is best to store it in a water tank.

[Function] However, since the outer chamber 2 is formed by the surrounding wall 16 having a light-shielding property and the inside thereof is in a substantially airtight state, the temperature, humidity, or light in the inner chamber 3 where the plants are housed is reduced. Conditions can be arbitrarily controlled as follows.

■ Temperature control in the inner chamber The temperature in the inner chamber 3 is controlled by raising or lowering the temperature of the water stored in the water storage tank 5 by operating the temperature control device 6, thereby increasing the heat dissipation effect of the stored water. This is done using endothermic action. If necessary, this can be done by flowing cold water into the cooling pipe 7 to lower the room temperature.

Temperature adjustment pipe 36 through which temperature adjustment device 6 flows temperature adjustment liquid
If the temperature control pipe 36 is installed in the water tank 5 so that the 1/2 portion 39 of the upper side passage is exposed to the air, the temperature control pipe 36
The liquid flowing through can heat or cool the water in the water tank 5 and at the same time directly warm or cool the air in the inner cavity 3. Therefore, in this case, the air in the inner chamber 3 can be warmed more quickly than in the case where the entire temperature control tube is submerged in water in the water tank.

(2) Humidity control in the inner chamber The humidity in the inner chamber is controlled by evaporating an appropriate amount of water in the water tank by operating the temperature control device W6. Also, if necessary, the cooling device 9 is operated to cool the inner space 3.
This is done by cooling it from the outside and creating a mist inside the interior cavity.

■ Light control inside the inner chamber 3 The light inside the inner chamber 3 is controlled by turning on the illumination lamp 45 for a certain period of time to allow light with the necessary illuminance to enter the inner chamber 3, which corresponds to daytime in the natural world. While creating a time zone,
This is done by turning off the illumination light 45 for a certain period of time to create a time zone that corresponds to night in the natural world, and repeating the time zone corresponding to daytime and the time zone corresponding to night alternately a required number of times.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, a growing device 1 according to the present invention has an outer cavity 2
An inner cavity 3 is provided inside, a water tank 5 is installed at the bottom of the inner cavity 3, a temperature control device 6 is attached to this water tank 5, and a cooling pipe 7 is installed above the inner cavity. In addition, a cooling device 9 and a lighting device 10 are provided above the inner cavity 3. In particular, in this embodiment, in order to automate the accommodation of plants in the inner cavity 3 and the removal of grown plants, the cart on which the plants are placed is directed from the entrance end 11a of the inner cavity 3 to the exit end 11b. A trolley conveying device 13 is installed, and the trolley taken out from the outlet end 11b of the inner chamber 3 is transported to the inner chamber 3.
The trolley recovery device 15 is transported toward the entrance end 11a of the
are equipped. A concrete explanation of this is as follows.

Way 11L! As shown in FIGS. 2 to 4, the outer chamber 2 is formed as a vertically elongated rectangular parallelepiped chamber whose interior is substantially sealed and is defined by a surrounding wall 16 having a light-shielding property.

In the outer cavity 2, a cavity frame is formed by arranging a pair of pillars 17, 17 and 1119 facing each other at a required interval on the concrete surface 20 at a required interval in the length direction. , longitudinally adjacent columns 1
7. The wall boards 21 are sequentially fitted and fixed between 7.17 to form the empty room side wall part 22, and the upper frontage part is covered with the ceiling board 23 to form the ceiling part 24. Regarding the openings at both ends, The lower end side opening is covered by an end face plate 25, and the upper opening of the lower end side opening can be closed by opening/closing M26 at a portion near the upper edge thereof. When the opening/closing lid 26 closes the upper opening, an outer chamber 2 whose interior is substantially sealed is formed.

In this embodiment, the wall plate 22, ceiling plate 23, end plate 25, and opening/closing lid 26 are made of a heat insulating material such as foamed synthetic resin, and their inner surfaces are reflective surfaces. There is.

Old! Sky! As shown in FIGS. 1 to 2 and 4, the inner cavity 3 is located within the outer cavity 2, with its cavity side wall also serving as the cavity side wall 22 of the outer cavity 2. It is provided along the entire length, and its ceiling portion 27 is formed in an arch shape with transparency. In this embodiment, the ceiling portion 27 is formed of a curved ceiling plate 29 made of a light-transmitting material such as reinforced glass, and the lower end portion 30. .22 A gutter body 31 provided continuously in the longitudinal direction at the center height position below the road on the inner surface.
31 and is fixed.

The integral body 31 is divided into an inner and outer part by a lower end portion 30 of the ceiling plate 29, and a drain port 33 connected to a hose 32 is provided at the bottom of the inner and outer divided gutter.

The lower space of the outer chamber 2 partitioned by the ceiling plate 29 is an inner chamber 3, and the openings at both ends are covered by the end plate 25 and the opening/closing lid 2.
The opening/closing lid 26a, 2 can be closed by the opening/closing lid 26a.
When the lid is closed by 6b, the interior is in a substantially airtight state. The end face plate 25 is made to cover the end face of the water tank 5 installed as described below, and an endless chino 52 of a chino conveyance device to be described later is provided at the center part in the width direction.
A notch 35 is provided for passing through.

The bottom of the inner cavity 3 is formed of a foamed synthetic resin board, and a tray-shaped water storage tank 5. 5 is installed.

The temperature control device 6 is for raising or lowering the temperature of the water in the water tank 5, and in this embodiment, the second
As shown in Figure 4, the temperature control pipe 36a through which hot water flows
and a temperature control pipe 36b through which cold water flows.

These two types of temperature control pipes 36a and 36b are connected to the water storage tank 5.
．． It is installed in each of the 5. The temperature control tubes 36a, 3
6b are both formed in the shape of a hairpin that is open at one end of the water storage tank 5 and bent into a U-shape at the other end. The upper half portion 39 is set so as to be exposed in the air in the open state (see FIG. 2). One end of the temperature control pipe 36a through which hot water flows is connected to hot water (for example, set at about 60°C) in a hot water tank 40 (see Figure 5).
The other end of the temperature control pipe 36a is connected to the inside of the hot water tank 40, and hot water is circulated by the operation of the pump. On the other hand, one end of the temperature control pipe 36b through which cold water flows is connected to the cold water (for example, set at about 0 to 5°C) of the cold water tank 41 (see Part 5). The other end is the cold water tank 41
It is configured so that cold water is circulated by the operation of the pump.

As shown in FIGS. 2 and 4, the Ryudangaya cooling pipe 7
It is formed as a meandering pipe arranged so as to cover the upper side of the inner chamber, and is suspended from the ceiling part 27 of the inner chamber 3. One end of the cooling pipe 7 is connected to the cold water in the cold water tank 41, and the other end of the cooling pipe 7 is connected to the inside of the cold water tank 41, so that the cold water is circulated by the operation of the pump. ing.

The dish cooling device 9 cools the inside of the inner chamber 3, and in this embodiment, as shown in FIGS. has been done. The water sprinkler pipe 42 is located slightly above the longitudinal center of the ceiling 27 of the inner cavity 3 and is disposed over almost the entire length of the inner cavity 3, and is suspended from the ceiling of the outer cavity 2. It is set up. One end thereof is communicated with the cold water of the cold water tank 41, and the other end is sealed, and water sprinkling holes 43 are provided at required intervals on both sides of the lower surface.

When cold water is pumped into the water sprinkling pipes 42 by operation of the pump, the cold water is sprayed from each water sprinkling hole 43 in the left and right direction of the ceiling portion 27, and the cold water flows down the ceiling portion 27. This cools the interior of the inner chamber 3.

Note that the water that has flowed down the ceiling section 27 and flowed into the outer divided gutter, and the condensed water that has adhered to the inner surface of the ceiling section and flowed down into the inner divided gutter due to water spraying, is drained from the drain port 33 and passed through the hose 32. It will be collected.

■As shown in FIGS. 2 and 4, the lighting device 10 includes a large number of lighting lights 45 arranged in parallel in the length direction on the lower surface of the ceiling of the outer space 2, and their illuminance. It includes a controller for adjusting the light and a switch for turning on and off the illumination light.

Hill cart I transport 11 The cart transport device 13 moves a cart 46 on which plants are placed from the entrance end 11a of the inner cavity 3 toward the exit end 11b. As shown, a rail member 49.49 is fixed to the inner surface of the opposing side wall of the inner cavity 3 in the stacked portion of the water storage tank, and both end portions 47.47 slightly protrude outward from both ends of the outer cavity 2.
and a chino transport device 50.

The endless chino conveying device 50 includes an endless chino 5 guided by a chino guide path 51 that is continuously provided in the longitudinal center of the bottom part of the inner chamber 3 (the gap formed between the water tanks).
2 are wound around chain wheels 53 and 55 disposed slightly outward from the end of the outer cavity 2, and one of the chain wheels 53 is rotated by the drive of the deceleration motor 56.
The upper running part of the endless chino 52 is the entrance end 11 of the inner cavity.
It is configured to rotate at a low speed from point a toward the outlet end 11b. The trolley 46 has a width approximately equal to the width of the inner chamber 3, and wheels 57 that can be moved on the rail member 49 are fixed to both ends of the lower surface of both side edges of the trolley 46. It has been made possible to drive. The carriage 46 is moved from the entrance end 11a of the inner cavity 3 to the exit by engaging the roller of the endless chino 52 with the engagement protrusion 59 protruding from the lower surface of the trolley 46 as the chino rotates. It is moved toward the end 11b.

As shown in FIGS. 2 to 5, the rising plate double device trolley recovery device 15 includes a lifting device 60, 60 installed outside the inlet end 11a and outlet end 11b of the inner empty chamber 3, and an outer empty chamber 3. A chino transport device 61 provided on the upper side of the ceiling of the chamber 2 is fixed to the inner surface of the upwardly protruding portions of the pillar rows on both sides in a facing state, and both end portions 62 and 62 are arranged outwardly from both ends of the outer empty chamber 2. It consists of a rail member 63, 63 that slightly protrudes from the top.

The lifting bag W60 is provided with rail members 49 on both sides of the upper surface of an lifting table 65 that can be moved up and down in accordance with the expansion and contraction of the hydraulic cylinder.
．． A short rail member 66.66 is provided continuous with the end portion 47.47 of 49.

When the elevating table 65 is in the lowest position, the short rail members 66, 66 are connected to the lower rail member 49,
4.9, and when the elevating table 65 is at the highest position, the short rail members 66.66 are continuous with the upper rail members 63.63.

The chino conveying device 61 moves both end portions of the endless chino 69 guided by a chino guide path 67 provided continuously in the longitudinal center of the upper surface of the outer cavity 2 to a position slightly outside the end of the outer cavity 2. By winding the chain wheels 70 and 71 disposed in the inner chamber and rotating one of the chain wheels 70 by the drive of the deceleration motor 72, the upper running part of the endless chainer 69 moves from the outlet end 11b of the inner cavity to the entrance. The trolley 46, which has been moved from the lifting table 65 to the upper guide rail 63, 63 so as to rotate at a low speed toward the end 11a, is moved by the engagement between the engaging portion on the lower surface of the trolley and the roller of the chino. As the chino rotates, it can be moved toward the entrance end 11a of the inner chamber 3.

The operation of the cultivation apparatus I having the above configuration will be explained based on FIGS. 1 and 6, taking as an example the case where it is used for growing a grafted larval surface.

First, as shown in FIG.
6a is opened, and a storage box 7 in which a grafted larva surface 73 is stored.
The carts 46 on which the carts 5 are placed are sequentially housed in the inner chamber 3 by rotating the endless chino 52 of the cart conveyance device 13. As shown in FIG. 7, the grafted larval surface 73 is produced by rooting the cut end of a cut-off rootstock 76 from which the root has been cut off and its vicinity, and then attaching the panicle 7 to this rootstock.
As shown in FIG. 8, they are housed side by side closely on the water-retaining pine door 9.

In this way, the grafted larval surface 73 is accommodated in the inner cavity 3, and the opening/closing lid is then closed to make the interior of the inner cavity 3 into a substantially airtight state. The conditions are controlled as follows.

■ Temperature control When it is necessary to raise the temperature inside the inner chamber 3, the pump is operated to flow hot water into the temperature control pipe 36a.This raises the temperature of the stored water, and the heated stored water Raise the room temperature by the heat dissipation effect.

In addition, the air inside the chamber is directly heated by the upper air exposed portion 39 of the temperature control tube 36a.

On the other hand, when it is necessary to lower the temperature in the inner chamber, the pump is operated to flow cold water into the temperature adjustment pipe 36b, and also into the cooling pipe 7 as necessary. This lowers the temperature of the stored water, and the room temperature is lowered by the endothermic action of the cooled stored water. In addition, the air within the chamber is directly cooled by the upper air-exposed portion 39 of the temperature control tube 36b. The cooling pipe 7 is conveniently used when the temperature inside the inner cavity particularly rises due to an increase in the outside temperature, etc., and the cooling water temperature yI node pipe 36 is increased by the endothermic action of the cooling pipe 7.
It supplements the cooling capacity of b and contributes to lowering the room temperature to the set temperature as quickly as possible.

(2) Humidity Control When the humidity in the inner chamber decreases, hot water is flowed through the hot water temperature control pipe 36a to raise the temperature of the stored water, thereby evaporating an appropriate amount of the stored water. If it is not possible to dry the interior of the chamber by evaporation of the water in the water storage tank alone, cold water is supplied to the sprinkler pipe 42 and water is sprinkled on the ceiling 27 of the inner chamber through the water sprinkling hole 43 to dry the interior of the chamber. The room 3 is cooled from the outside to generate fog inside the room, and each part of the room is kept in a substantially uniform required humidity state.

■ Light control The light inside the inner chamber 3 is controlled by the lighting device 10 because the outer chamber 2 is formed by a surrounding wall that has a light-blocking property.
This can be done freely by

When the illumination lamp 45 is turned on, light is irradiated from the ceiling part 27 into the inner empty room 3, creating a state equivalent to daytime in the natural world, and when the illumination light 45 is turned off, a state equivalent to night in the natural world is created. . The illuminance, the time for turning on and off the illumination light, and the number of times the illumination light is turned on and off are set to the optimum value, taking into consideration the cultivation conditions of the plant.

By controlling the temperature, humidity, and light conditions necessary for the growth of grafted larval seedlings in the manner described above, the joint portion of the panicle of the grafted larval seedlings can be well established, resulting in grafted seedlings that can be planted. . The grafted seedlings that have been grown as required are sequentially taken out from the inner chamber 3 by opening the opening/closing lid 26b on the exit side and rotating the endless chino 52 of the rear carriage transport device 13. The left end of FIG. 1 shows the cart 46 that has been moved to the lifting table 65 at the lowest position and the storage box 75 for grafted seedlings placed on the cart 46. When the storage box 75 is removed from the cart 46 in this state, the cart can be recovered by raising the display table 65 to the highest position, and then moving the cart 46 to the short rail member 66 of the lifting table 65. The trolley 46 is then transferred to the upper rail member 63, 63 by the operation of the chino transport device 61 toward the entrance end 11a, and is lowered by the lifting device 60 installed outside the entrance end. This is done by If necessary, the storage box 75 for grafted seedlings taken out from the inner empty space 3 is moved to the outer empty space 2 in the same manner as for collecting the trolley, as shown by the dashed line in Fig. 2.
Place them on the top of the room and allow them to acclimate to the natural environment for a certain period of time. The trolley recovery device 15 may be utilized in this way.

Next, the results of an experiment in which grafted watermelon and tomato larvae were grown using the cultivation apparatus according to the present invention will be shown.

■ In the case of watermelons, the temperature inside the inner chamber should be set to 20-25°C.The temperature difference between the daytime equivalent state with the lights on and the nighttime equivalent state with the lights turned off is 3-5°CL, and the humidity should be set to about 90%. The day is divided into 2 hours, with 6 hours each for the daytime period and 6 hours for the nighttime period.
It will be used every day, and the illuminance will be set at 3,000 to 6,000.
As a result of growing the grafted seedlings in Runcus, it was possible to grow them into fully rooted grafted seedlings in about two days. In addition, when grown using the conventional method, it usually takes about 4 days, so the number of days for growing can be reduced to about half.

■ In the case of tomatoes, set the temperature in the inner chamber to 18 to 23°C (the temperature difference between the daytime equivalent state with the lights on and the nighttime equivalent state with the lights turned off is 3 to 5°C), and the humidity to about 90°C. %, the day time period and the night time period are set to 6 hours each, and one day is used for 2 days, and the illuminance is set to 3000 on the first day.
~4000 lux, 6000-8000 lux on the 2nd day, 12000 lux on the 3rd day, 4th day +;! As a result of growing at a setting of about 15,000 lux, it was possible to grow the grafted seedlings into fully rooted grafted seedlings in about 4 days. It should be noted that when grown using the conventional method, it took about 8 days to grow, so the number of days for growth could be reduced to about half.

In the device according to the present invention, when the temperature control device is configured with a temperature control tube through which temperature control liquid flows, the temperature control tube may be configured as separate tubes for heating and cooling. In some cases, it is constructed as a tube that serves both heating and cooling purposes.

Further, the cooling device for cooling the inside of the inner cavity may be configured as a cold air blowing pipe that blows cold air into the inner cavity.

(Effects of the Invention) When the cultivation device according to the present invention is used, it becomes possible to control the temperature, humidity, and light conditions, which are the key to the cultivation conditions of plants, in a well-balanced manner so as to best suit the cultivation conditions of each individual plant. .

Therefore, it is possible to significantly shorten the time for rooting in areas such as the growth of grafted larval seedlings, which have traditionally been affected by natural weather conditions and have been particularly problematic in terms of productivity and production costs. Cultivation management for acclimatization of tissue culture and germination of seeds, which requires a special environment, can be carried out reliably and easily.

Further, the device according to the present invention provides an inner cavity within the outer cavity formed by the surrounding wall having a light-shielding property, and a water storage tank and a temperature adjustment device for regulating the temperature and humidity in the interior cavity. A configuration in which a cooling pipe is provided, a cooling device is provided to cool the inside of the inner cavity to expose water vapor evaporated from the water storage tank, and a lighting device is further provided to irradiate light of a required intensity into the inner cavity. Since this method is adopted, the temperature, humidity, and light conditions in the inner chamber can be arbitrarily set to suit the cultivation conditions of individual plants.

For this reason, according to the present invention, the growth of plants can be promoted in a very favorable manner, and productivity can be improved and production costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a cultivation device according to the present invention, and FIG. 2 is a sectional view showing the device according to the present invention in its usage state.
FIG. 3 is a perspective view showing the device according to the present invention, FIG. 4 is a partially cutaway perspective view thereof, FIG. 5 is a partial perspective view thereof, and FIG. 6 is a state in which plants are accommodated in the inner cavity. FIG. 7 is a perspective view showing a grafted larval seedling, and FIG. 8 is a perspective view illustrating a state in which the grafted larval seedling is accommodated in a storage box. DESCRIPTION OF SYMBOLS 1...Cultivation device, 2...Outer empty room, 3...Inner empty room, 5...Water tank, 6...Temperature control device, 7...
Cooling pipe, 9... Cooling device, lO... Lighting device, 11
... Opening, 13... Dolly transport device, 15... Dolly recovery device, 16... Surrounding wall, 27... Ceiling part, 36
... Temperature control tube, 38 ... Approximately 1 on the lower side of the temperature control tube
/2 part, 39...Approximately 1/2 part above the temperature control pipe, 42...Water pipe.

Claims (3)

[Claims] (1) Inside the outer space 2 formed by the surrounding wall 16 having light-blocking properties, there is provided an inner space 3 whose interior is in a substantially airtight state, and the inner space 3 can be closed with a lid for taking plants in and out. an opening 11 is provided, a water storage tank 5 is installed in the inner cavity 3, and the water storage tank 5
is equipped with a temperature control device 6 for raising or lowering the temperature of the water in the tank, and a cooling pipe 7 for flowing cold water is installed in the inner cavity 3. A cooling device 9 is disposed on the upper side to cool the interior of the inner chamber 3, and a cooling device 9 is provided in the outer chamber 2 to illuminate the plants housed in the inner chamber 3 with light at a required intensity for a certain period of time. A plant cultivation device characterized by being provided with a lighting device 10 for illumination. (2) Inside the outer space 2 formed by the surrounding wall 16 having a light-shielding property, there is provided an inner space 3 whose interior is substantially sealed and whose ceiling part 27 is formed in an arch shape using a translucent material. Closable openings 11a and 11b for taking plants in and out are formed at both ends of the inner chamber 3, and a tray-shaped water storage tank 5 is provided at the bottom of the inner chamber 3 over almost its entire length. The water storage tank 5 is equipped with a temperature control pipe 36 through which a temperature control liquid flows to raise or lower the temperature of the water in the tank, and the upper part of the inner cavity is equipped with cold water. A water sprinkling pipe 42 is disposed slightly above the longitudinal center of the ceiling 27 of the inner cavity 3 to spray cold water in the left-right direction of the ceiling 27. A plant cultivation device characterized in that an illumination device 10 is disposed above the translucent ceiling portion 27 to allow light of a required illuminance to enter each part of the empty room in a substantially uniform state for a certain period of time. . (3) The temperature control tube 36 has a lower approximately 1/2 portion 38
3. The plant cultivation device according to claim 2, wherein the plant cultivation device is installed in the water tank so that the plant exists in the water in the water tank 41 and approximately 1/2 part 39 of the upper side thereof is exposed to the air.