JP2017201929A - Multistage raising seedling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a uniform air flow throughout a raising seedling space and to enable irradiation of an artificial light source evenly, in a multistage raising seedling apparatus that cultivates a plant seedling inside a closed structure using an artificial light source.SOLUTION: An artificial light source 6 is installed at the ceiling part of a raising seedling shelf 3 and a through hole 7 is installed to install a ventilation fan 8, a raising seedling bed 4 is installed through a raising seedling bed-support rod 9 on a ceiling part side-shelf board 2 of the raising seedling shelf 3 in a middle stage to ensure an air exhaust passage in the raising seedling shelf 3 in the lower stage, a reflection member 10 is attached to the side face of the raising seedling shelf 3 to generate a uniform air flow in which the air is drawn in from an opening of the lower part and out upward, light is reflected to inside by a reflecting member 10, whereby unevenness in quantity of light is suppressed, and swinging of the reflecting member 10 while being curved by an air flow allows light to reach until the back side of a leaf.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multistage seedling raising apparatus for growing plant seedlings using an artificial light source inside a closed structure.

  Inside the closed structure, light quality, light intensity and irradiation time can be freely set by an artificial light source, temperature, humidity and the like can be adjusted by an air conditioner, and carbon dioxide concentration can be adjusted. In addition, it is easy to adjust the amount of irrigation, fertilizer concentration, etc., and it is possible to adjust various environmental conditions to the optimum state for seedling growth, high quality without being affected by pathogenic bacteria and pests, and not affected by the weather Can be produced. And production efficiency can be raised by arranging a seedling shelf in multiple stages. Therefore, inside the closed structure where natural light does not enter, the temperature and humidity are adjusted by the air conditioner, the nutrient solution is supplied to the nursery bed by the nutrient solution automatic supply device, the carbon dioxide is supplied by the carbon dioxide supply device, Various multi-stage seedling raising apparatuses that grow plant seedlings using an artificial light source have been developed.

  In order to efficiently produce seedlings of uniform quality using such a multi-stage seedling device inside a closed structure, it is necessary to control the temperature, humidity and carbon dioxide concentration in the seedling space inside the seedling rack to be uniform. It is necessary, and for that purpose, it is necessary to create a uniform air flow throughout the nursery space and to efficiently irradiate seedlings with light from an artificial light source.

  A conventional multi-stage seedling raising apparatus, for example, sends air from a back side to a seedling shelf by a fan and discharges it from the front side (see, for example, Patent Document 1). In addition, a fan is installed by providing a through-hole on the back side of each stage of the multi-stage plant cultivation device, and an opening for ventilation is provided on the other side, or the front side is fully opened, It is also known in the art that the air is sucked in from the opening on the side surface or the front side that is fully open and discharged from the back side (see, for example, Patent Document 2). However, these both perform air suction and discharge from the side, and there is a difference in wind speed between the windward and leeward, making it difficult to create a uniform air flow. In addition, since the conventional apparatus has a wall surface structure in which the front side surface serving as a work outlet is opened and the back side surface reflects light, the amount of light can be uneven between the front side and the back side. Therefore, the quality of the seedling is not constant.

  Separately, it is a multi-stage shelf type plant growing apparatus arranged in a closed facility, and the inside of the growing unit of each stage is divided into an upper chamber and a lower chamber by a top plate, and the upper chamber and the lower chamber are separated. A ventilation window is formed on the side, and a fan that generates airflow from the lower chamber to the upper chamber is installed in the through hole formed in the top plate, and the air sucked from the ventilation window on the lower chamber side is sent to the upper chamber It is known to be sucked up and discharged to the outside through the ventilation window of the upper chamber, and by providing a reflector on the lower chamber surface, it is possible to irradiate the plant from multiple angles (For example, refer to Patent Document 3).

JP 2001-346450 A JP 2008-212078 A JP 2004-121074 A

  If air is sucked into and discharged from each stage of the seedling space of the multistage seedling raising device from the side as before, there is a difference in wind speed between the windward and leeward, creating a uniform flow of air. In addition, there is a difference in the amount of light between the front side part that is opened as a work outlet and the back side part that reflects the light with the wall structure, so the amount of light is uneven, so it is efficient for seedlings throughout the area. Cannot irradiate light.

  Moreover, like the above-mentioned plant growing device, the inside of the growing unit is divided into an upper chamber and a lower chamber by a top plate, ventilation windows are formed on the side surfaces of the upper chamber and the lower chamber, and a through hole formed in the top plate is formed. A fan that generates airflow from the lower chamber to the upper chamber is installed, and the air sucked from the ventilation window on the side of the lower chamber is sucked into the upper chamber and discharged from the ventilation window of the upper chamber to the outside. Even so, it is difficult to efficiently irradiate the plant with the light of the artificial light source throughout the area. With this configuration, the side end portion of the lower chamber has a lower light amount than the center portion, and the light amount is uneven. Therefore, particularly when used as an apparatus for growing vegetable seedlings, the amount of light necessary for growing seedlings cannot be ensured uniformly throughout the entire area, and seedlings with uniform quality cannot be efficiently produced.

  Therefore, in a multistage seedling raising device that uses artificial light sources to grow plant seedlings inside a closed structure, a uniform air flow is created throughout the nursery space to equalize the temperature, humidity, and carbon dioxide concentration. It is a problem to be able to efficiently irradiate seedlings with light from an artificial light source in the entire area and to efficiently produce seedlings of uniform quality, and to solve this problem Is the purpose.

  The multi-stage seedling raising apparatus of the present invention has a plurality of raising seedling shelves, adjusts temperature and humidity with an air conditioner inside a closed structure that does not receive natural light, and supplies nutrient solution with an nutrient solution automatic supply device, In a multistage seedling raising apparatus that feeds carbon dioxide with a carbon dioxide supply apparatus and grows plant seedlings using an artificial light source, the through holes provided in the shelf (preferably the central part) on the top of each seedling shelf A blower fan is installed so as to suck out air upward from the nursery shelf, and above the shelf on the top side of the nursery shelf located in the middle stage between the uppermost stage and the lowermost stage, from the adjacent lower seedling shelf A seedling bed is installed through a seedling bed support rod so as to secure a space to become a discharge passage for air sucked out through the through hole, and the front and rear side surfaces of each seedling shelf are opened and opened. On the front and back sides, at least inside A film-like reflective member made of a material with a high light reflectivity on the surface is mounted so that it can be opened and closed up and down with the upper end as a fulcrum, leaving a ventilation gap at the bottom of the side when closed And

  This multistage seedling raising device has a ventilation gap in the lower part of the front and rear side surfaces of the seedling rack with the reflecting member closed. Then, air is sucked into the nursery space from the gap between the lower portions of the front and rear sides of the nursery shelf by the blower fan, and sucked out from the through hole of the shelf on the top side of the nursery shelf. The air sucked out from the through-hole is discharged as a discharge passage in a nursery shelf other than the uppermost stage, with a gap secured between the shelf on the top and the nursery bed of the upper nursery shelf adjacent to the top. In the uppermost nursery shelf, the air sucked out from the through hole is discharged to the outside as it is, and a uniform air flow is generated in the entire area of the nursery shelf at each stage. Therefore, it becomes easy to control the temperature, humidity and carbon dioxide concentration to be uniform in the nursery space at each stage.

  Moreover, this multistage seedling raising device irradiates the seedlings of plants lined up on the seedling bed from above with the light from the artificial light source inside the seedling rack with the reflecting member closed. And most of the light that is about to leak from the front and rear side surfaces is reflected inward by the reflecting member, thereby suppressing a decrease in the amount of light at the front and rear side end portions on the nursery bed. The difference in the amount of light can be reduced to reduce the unevenness in the amount of light.

  In addition, it is sucked by the air flow sucked from the gap below the reflecting member, and the reflecting member is curved inward, so that the light reflection direction is upward, and the back side of the leaf where light from above is difficult to hit Light can be efficiently irradiated to increase the photosynthesis efficiency of the seedling. Then, the curved reflecting member fluctuates as the air fluctuates, and the light reflection direction constantly changes, so that light reaches the back side of the leaf in a wide range, and the efficiency of photosynthesis increases.

  In this way, the light from the artificial light source and the reflected light can be efficiently irradiated from multiple angles while securing an appropriate amount of light in the entire nursery space of each stage, and seedlings with uniform quality can be produced.

  In addition, this multistage seedling raising device can open both the front and rear sides of the seedling shelf by opening or removing the reflecting member, and the raising and lowering of the seedling bed etc. can be performed from both the front and rear sides. Workability is improved.

  In the multistage seedling raising device of the present invention, with the reflecting member closed, air is sucked into the seedling raising space from the lower part of the front and rear side surfaces of the seedling shelf by the blower fan, and the through hole of the shelf on the top side of the seedling shelf By being sucked out and discharged, it is possible to generate a uniform air flow across the entire seedling shelf at each stage, and to easily control the temperature, humidity and carbon dioxide concentration in the nursery space Become.

  In addition, with the reflecting member closed, most of the light that leaks from the front and rear side surfaces is reflected inward by the reflecting member, thereby suppressing a decrease in the amount of light at both front and rear end portions on the seedling bed. It is possible to reduce the difference in the amount of light from the central portion and to reduce unevenness in the amount of light.

  In addition, it is sucked by the air flow sucked from the gap below the reflecting member, and the reflecting member is curved inward, so that the light reflection direction is upward, and the back side of the leaf where light from above is difficult to hit Light can be efficiently irradiated to increase the photosynthesis efficiency of the seedling. Then, the curved reflecting member fluctuates with the fluctuation of air, and the light reflection direction constantly changes, so that light reaches the back side of the leaf in a wide range, and the photosynthesis efficiency is further increased.

  In this way, the light from the artificial light source and the reflected light can be efficiently irradiated from multiple angles while securing an appropriate amount of light in the entire nursery space of each stage, and seedlings with uniform quality can be produced.

  In addition, this multistage seedling raising device can open both the front and rear sides of the seedling shelf by opening or removing the reflecting member, and the raising and lowering of the seedling bed etc. can be performed from both the front and rear sides. Workability is improved.

  Thus, according to the present invention, in a multistage seedling raising apparatus that grows plant seedlings using an artificial light source inside a closed structure, a uniform air flow is generated in the entire area of the seedling raising temperature, It is possible to make the humidity and the carbon dioxide concentration uniform, and to efficiently irradiate the seedlings with the light of the artificial light source over the entire area, and to efficiently produce seedlings with uniform quality. In addition, workability for taking in and out the seedling bed is improved.

It is a schematic side view of the multistage seedling raising apparatus as an example of an embodiment of the present invention. It is a schematic plan view which shows the flow of the exhaust air of the multistage type seedling raising apparatus of FIG. It is a schematic diagram which shows schematic arrangement | positioning of the seedling container which installed the multistage type seedling raising apparatus of embodiment of this invention, (a) is a top view, (b) is a side view. It is a light quantity distribution figure at the time of providing a reflective member. It is a light quantity distribution figure when not providing a reflecting member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic structure of a multi-stage seedling raising apparatus (hereinafter abbreviated as “a seedling raising apparatus” as appropriate) as an example of an embodiment of the present invention.

  The multi-stage seedling raising apparatus of this embodiment (hereinafter, abbreviated as “nursing seedling apparatus” as appropriate) E is an apparatus for growing plant seedlings, especially vegetables for hydroponics (green soybeans, etc.). The width dimension (the direction perpendicular to the paper surface in FIG. 1 is the width direction and corresponds to the left-right direction as viewed from the front of the apparatus) is 1800 to 2000 mm (for example, 1800 mm), and the depth dimension (the left-right direction in FIG. (It corresponds to the front-rear direction when viewed from the front of the apparatus.) Is 650 to 1000 mm (for example, 1000 mm) and the height is 1800 to 2000 mm (for example, 1800 mm). 5 sheets of shelf boards 2 are attached at intervals of 400 to 500 mm (for example, 400 mm) in the upper and lower directions, and the space between these shelf boards 2 and the shelf boards 2 is a seedling raising shelf 3, respectively. Multistage having Naetana 3 (although in the illustrated example is a four-stage, the number of stages can be appropriately changed.) Constitutes a seedling device E for. Each stage of the seedling shelf 3 is divided into a top plate and a bottom plate by a shelf board 2, and the top shelf board 2 constitutes the top part of the top nursery rack 3, and the second shelf from the top. The plate 2 constitutes the bottom of the uppermost nursery shelf 3 and constitutes the top of the seedling shelf 3 in the second (lower) side adjacent from the top, and the third and lower shelf 2 excluding the bottom are In the same manner, the bottom part of the upper seedling shelf 3 and the top part of the adjacent lower seedling shelf 3 are formed, and the bottom shelf 2 forms the bottom part of the lower seedling shelf 3. Yes.

  In each stage of the seedling rack 3, a seedling bed 4 (also a water supply tray) is installed on the shelf 2 on the bottom side via a seedling bed support bar 9 as described later. And the cell tray 5 which has many cultivation holes is arrange | positioned at the seedling raising bed 4. FIG. The cell tray 5 is a molded product of a resin sheet such as polyethylene or polystyrene foam.

  An artificial light source (artificial lighting device) 6 is installed on the lower surface of the shelf 2 on the top of the seedling shelf 3 in each stage (in this embodiment, LEDs are used. However, instead of LEDs, fluorescent lamps are used. Etc. can also be used.) The artificial light sources 6 are provided on the lower surface of the shelf 2 in a plurality of rows at intervals in the front-rear direction (left-right direction in FIG. 1) (in the illustrated example, there are six rows, but the number of rows is It can be changed as appropriate.) A reflective film such as aluminum or a reflective plate can be installed on the lower surface of the top shelf 2 on which the artificial light source 6 is installed (the shelf 2 other than the lowest shelf 2).

  And the shelf 2 on the top side of the seedling shelf 3 of each stage has a predetermined position (not shown) arranged in a line at intervals in the width direction of the shelf 2 (direction perpendicular to the paper surface of FIG. 1). In the example, there are three places, but the number of places can be changed as appropriate.) Is provided with a through hole 7 for mounting a fan, and a blower fan 8 is installed in this through hole 7 so as to suck air upward from the nursery rack 3. ing.

  A plurality of seedling bed support bars 9 are installed on the shelf 2 on the top side of the seedling rack 3 excluding the uppermost stage. The plurality of seedling bed support rods 9 extend in the front-rear direction of the shelf 2 (the left-right direction in FIG. 1) with two adjacent seedling bed support rods 9 sandwiching one fan mounting through hole 7. Arranged in parallel with a gap in the width direction of the shelf 2 (direction perpendicular to the paper surface of FIG. 1) (in the example shown in the figure, four seedling bed support bars 9 are provided for three through holes 7. However, if the number of through holes 7 changes, the number of seedling bed support rods 9 changes accordingly.) A seedling bed 4 is installed above the shelf board 2 with the seedling bed support rod 9 as a support.

  The middle stage seedling rack 3 positioned between the uppermost stage and the lowermost stage is provided with the seedling bed 4 on the shelf board 2 on the top side via the seedling bed support rod 9, so that each through hole is provided. Between the two parallel seedling bed support rods 9 on both sides of 7 and between the shelf 2 and the seedling bed 4, the air sucked through the through hole 7 from the adjacent lower seedling rack 3 An interval t of 20 to 50 mm (preferably 50 mm) is secured so as to be a discharge passage. FIG. 2 schematically shows the flow of exhaust air of the multistage seedling raising apparatus of the present embodiment in a plan view. The air sucked upward from the seedling rack 3 through the through hole 7 by the blower fan 8 passes between two parallel seedling bed support rods 9 on both sides of the through hole 7 as shown by arrows in FIG. Discharged through. The left-right direction in FIG. 2 is the front-rear direction of the seedling rack 3 (left-right direction in FIG. 1). And the up-down direction of FIG. 2 is the horizontal width direction (direction perpendicular | vertical to the paper surface of FIG. 1) of the seedling raising rack 3. As shown in FIG. The inside of the nursery rack 3 is a nursery space between the top shelf 2 and the nursery bed 3. The air sucked through the through hole 7 on the top side of the uppermost seedling raising shelf 3 is directly discharged to the upper part of the apparatus. In the illustrated example, a seedling bed support bar 9 is also installed on the shelf 2 on the top side in order to adjust the height of the seedling bed 4 in the lowermost seedling rack 3.

The side surface of the front seedling shelf 3 (left side in FIG. 1) and rear (right in FIG. 1), opened and closed freely up and down the upper portion as a fulcrum, to secure the opening space for work in opened upward The reflective member 10 is attached to be openable and closable up and down so that the side surface is opened widely and closed with a gap for ventilation between the seedling bed 3 and closed. The reflecting member 10 is, for example, a vinyl film having an aluminum vapor deposition layer on the surface. At least the inner surface may be a film-like member (preferably a flexible member) made of a material having a high light reflectance. And the reflecting member 10 is attached to the shelf 2 on the top part of the seedling rack 3 as shown in FIG. 1, and is separated from the front and rear ends of the seedling bed 4 by a distance S1 (about 10 to 25 mm) in the horizontal direction. The air inlet to the seedling raising space is secured by installing it at a position and disposing a gap with a distance S2 (about 20 to 30 mm) in the vertical direction from the upper edge surface of the seedling raising bed 4.

This seedling raising device E is installed inside a closed structure such as a container that does not allow natural light, adjusts temperature and humidity with an air conditioner, supplies nutrient solution with a nutrient solution automatic supply device, and supplies carbon dioxide. Is used to grow plant seedlings using artificial light sources. The seedling raising container C (closed structure) is a closed structure that does not receive natural light, for example, having a width of 3600 mm, a length of 11700 mm, and a height of 2500 mm (the size is not limited to this), and is shown in FIG. As described above, a lighting device (fluorescent lamp) 12, an air conditioner 13, a circulation fan 14 and the like are provided in the room, and a circulation nutrient solution tank 15, a liquid manure tank 16, an operation panel 17, a CO ₂ stand 18 and the like are provided outside the room.

  Inside the seedling container C, a plurality of seedling devices E are arranged in a line. Then, a nutrient solution automatic supply in which seeds of vegetables such as green soybeans are seeded on a sponge-like porous carrier such as a sponge or a culture soil fitted in the cultivation hole of the cell tray 5, and the nutrient solution in the circulation nutrient solution tank 15 is supplied and circulated. The nutrient solution is supplied by the device. The nutrient solution in the circulation nutrient solution tank 15 is sent to the uppermost nursery bed 4 by a pump (not shown) to moisten the sponge-like porous carrier or soil. The supply and discharge of nutrient solution is performed independently on each shelf.

The inside of the seedling container C is adjusted to a temperature of 19 to 28 ° C. (preferably 19 to 23 ° C.) and a humidity of 60 to 85% (preferably 65 to 85%) by the air conditioner 13, and carbon dioxide in the CO ₂ stand 18. The carbon dioxide concentration is adjusted to 1000 ppm or more, preferably 1000 to 1500 ppm.

  As shown in FIG. 3, the seedling raising device E is usually installed in a row in a seedling container C. In this case, the seedling raising device E placed in the middle of the row has left and right side surfaces as open surfaces. The side surface on the row end side of the seedling raising apparatus E located at the row end is a closed wall surface. Moreover, when installing the single seedling raising apparatus E independently, it is set as the wall surface which closed the right and left side surface. A reflective film such as aluminum or a reflective plate can be installed on these closed wall surfaces.

  And the seedling raising apparatus E is normally used in the state which closed the reflection member 10. FIG. In this state, on the front and rear side surfaces of the nursery rack 3, a gap for ventilation (a gap of a distance S2 (about 20 to 30 mm) in the vertical direction from the upper edge surface of the seedling bed 4) is opened in the lower part. Air is sucked into the seedling space from this gap, and is sucked out by the blower fan 8 from the through hole 7 of the shelf 2 on the top side of the seedling rack 3. The air sucked out from the through hole 7 serves as a discharge passage in the seedling rack 3 other than the uppermost stage, with a gap t between the shelf 2 on the top and the seedling bed 4 of the upper nursery rack 3 adjacent thereto. In the uppermost seedling rack 3, the air sucked out from the through hole 7 is discharged upward as it is. In this way, a uniform air flow (the air flow rate is 0.1 m / sec or more, preferably 0.2 to 1.0 m / sec) is generated over the entire seedling space of the seedling rack 3 of each stage, and the temperature, humidity, and dioxide A nursery environment with uniform carbon concentration. Moreover, the cultivation which maintained the suitable transpiration rate is attained by maintaining a suitable airflow rate.

  In addition, the seedling raising device E closes the reflecting member 10, and the light from the artificial light source 6 irradiates the seedlings of the seedling bed 4 from above inside the seedling rack 3 and tries to leak from the front and rear sides. Since most of the light is reflected inward by the reflecting member 10, a decrease in the amount of light at the front and rear side end portions on the nursery bed 4 is suppressed, the difference in the amount of light from the central portion is reduced, and unevenness in the amount of light is reduced. The photosynthesis efficiency is increased over the entire area of the nursery bed 4. In addition, the reflective member 10 is bent inward by being sucked by the air flow sucked from the gap below the reflective member 10, and the light is reflected upward so that the back side of the leaf is efficiently irradiated with light. To do.

FIG. 4 shows a state in which three areas are set by dividing the upper surface of the seedling bed 4 in the left-right direction (left and right in the figure) in a state where the closed reflecting members 10 are arranged on the front and rear sides (up and down in the figure) of the seedling bed 4. Each of the areas is further divided into 50 partial areas in 5 columns on the left and right, and 10 columns on the front and back, and 6 high-intensity LEDs, which are artificial light sources 6, are lit, at a height of 27 cm from the bottom of the tray on the nursery bed 4 The amount of light for each partial region is measured, and the distribution of the amount of light for each partial region is displayed in PPFD (photosynthesis effective light bundle density, unit: μmol / m ² / s). The left and right sides of the nursery bed 4 are open.

FIG. 5 shows a comparative example in which the reflecting member 10 is removed, the light quantity is measured with the same settings as in FIG. 4, and the light quantity distribution for each partial region is expressed by PPFD (photosynthesis effective light quantity bundle density, unit: (μmol / m ² / s). Also in this case, the left and right sides of the nursery bed 4 are open.

  By providing the reflecting member 10, the amount of light at the front and rear end portions of the seedling bed 4 is increased by 10 to 30% at a position about 10 cm away from the reflecting member 10 compared to before the reflecting member 10 is provided. The rate of increase attenuates as the distance from the reflecting member 10 increases. However, since the amount of light at the center portion is originally high, the amount of light at the side end portion increases, thereby reducing the unevenness of light at the center portion and the side end portion. 4 and FIG. 5, the light quantity distribution in the central region is high as a whole because the right and left sides of the seedling bed 4 are open. However, in actual use, a plurality of seedlings are grown. Since the devices E are arranged in a row, the left and right regions are also irradiated with light from the artificial light source 6 of the adjacent seedling raising device E, and the side wall on the row end side of the seedling raising device E located at the row end is closed. Therefore, the light reflected by the wall surface is irradiated to the region on the row end side, and therefore, the amount of light in the left and right regions of the seedling bed 4 is not significantly different from the central region. In addition, when only one seedling raising apparatus E is installed, the left and right side surfaces are actually closed wall surfaces, so that the amount of light in the left and right areas of the seedling bed 4 is not much different from the central area.

  Table 1 shows the distribution of the amount of light (PPFD) in the 50 divided partial regions of the left and right regions of the three regions divided into left and right in FIG. 4 and FIG. The case where there is (FIG. 4) and the case where there is no (FIG. 5) are displayed in comparison, and the rate of increase in the amount of light when the reflecting member 10 is present is displayed. Here, the left end region is shown, but the light amount distribution in the right end region is the same as that in the left end region, with the left and right being reversed. In addition, the light amount distribution in the central region has a high light amount as a whole, but the increase rate is substantially the same as that of the left and right regions.

  In addition, the reflecting member 10 that is sucked and curved by the air flow sucked in as described above fluctuates as the air fluctuates, so that the light reflection direction constantly changes, and light reaches the back side of the leaf in a wide range. Thus, the photosynthetic efficiency is further increased. The reflection member 10 can be swung back and forth with a width of about 10 to 25 mm by attaching a bar-like weight w to the lower part.

In this way, the PPFD (photosynthesis effective light intensity bundle density) 200-350 μmol / m ² / s necessary across the entire seedling space of each stage can be secured and efficiently irradiated from multiple angles, so that uniform quality seedlings can be obtained. Can be produced.

  And this seedling raising apparatus E can open | release both the front and back side surfaces of the seedling raising shelf 3 by opening the reflection member 10, or removing it, and can take in and out the cell tray 5 from both sides. it can.

  The result of investigating the growth status of tomato seedlings in Examples using the multistage seedling raising apparatus E of the embodiment shown in FIGS.

  Table 2 shows the growth status of tomato seedlings grown on the seedling device E at the light setting of 19 hours in the light period and 5 hours in the dark period, and at the temperature setting of 24 ° C. and the dark period of 19 ° C. The survey results are shown. In this table, five seedlings a to e (see FIG. 1) grown in different positions from the side end to the side end in the front-rear direction on the seedling bed 4 are indicated by “seedling Nos. 1 to 5”. Yes. “Seedling No. 1” is the seedling a in FIG. 1, “Seedling No. 2” is the seedling b, “Seedling No. 3” is the seedling c, “Seedling No. 4” is the seedling d, and “Seedling No. 5” is Corresponds to seedling e. And seedling No. Every 17 days, plant height (height from the ground to the growth point), hypocotyl length (length from the ground to the cotyledonary node), number of leaves (number of deployed leaves with a leaf length of 3 cm or more), embryo The measured value (unit: cm) of the shaft diameter (thickness of the hypocotyl) is shown.

  The growth conditions of the seedlings a to e grown at different positions in the front-rear direction on the nursery bed 4 are generally good, the difference in the growth conditions due to the difference in position is small, and almost constant quality is ensured.

E Multi-stage seedling raising device 1 Main body frame 2 Shelf 3 Nursery shelf 4 Nursery bed 5 Cell tray 6 Artificial light source 7 Through hole 8 Blower fan 9 Nursery bed support rod t Interval 10 Reflective member w Weight C Nursery container (closed structure)
12 illumination device 13 air conditioning system 14 circulating fan 15 circulating nutrient solution tank 16 liquid fertilizer tank 17 operating panel 18 CO ₂ stand

Claims (1)

There are multiple stages of seedling racks, the temperature and humidity are adjusted by an air conditioner inside a closed structure where natural light does not enter, nutrient solution is supplied by an automatic nutrient solution supply device, and carbon dioxide is supplied by a carbon dioxide supply device In a multistage seedling raising apparatus that grows plant seedlings using an artificial light source,
Install a blower fan to suck out air upward from the nursery shelf in the through hole provided in the shelf on the top side of each nursery shelf,
Above the shelf on the top of the nursery shelf located in the middle stage between the uppermost stage and the lowermost stage, an interval that becomes a discharge passage for the air sucked through the through hole from the adjacent lower seedling rack Set up a seedling bed through a seedling bed support rod to ensure
Open the front and rear side surfaces of each nursery shelf, and open and close the film-like reflecting member on the opened front and back side surfaces with the upper end as a fulcrum. A multi-stage seedling raising device that is attached so as to leave a gap for ventilation.

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