JP7129906B2 - Seedling cultivation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cultivation apparatus and a cultivation method for cultivating Solanaceae seedlings, and more particularly to a cultivation apparatus and a cultivation method for suppressing growth obstacles when cultivating Solanaceae seedlings.

The production of seedlings of various plants has hitherto been the mainstream for horticultural crop farmers. However, since the technique required to produce seedlings of various plants is sophisticated and troublesome, it has changed to use purchased seedlings. This is due to the aging of farmers, the progress of labor shortages, and the progress of corporateization and expansion of scale of horticultural crop farmers in recent years. At the same time, there is a tendency to specialize in only one field. Under these circumstances, the demand for purchased seedlings has been increasing in recent years, and the number of farmers who concentrate only on the production of seedlings and the number of companies engaged in the production of seedlings has also increased.

Even if the seedling producer is a full-time farmer or a large-scale company, seedling production can be performed by (A) a method of producing outdoors using natural light, (B) a method of producing in a greenhouse using natural light, and (C) a method of producing in a closed environment (Patent Document 1 or 2). The production of seedlings by methods (A) and (B) was greatly affected by the weather, especially the amount of solar radiation. For example, strong sunlight and high temperatures in summer make seedling production difficult, and some plants must be grown in cold climates to avoid this. In addition, in method (B), the temperature inside the greenhouse becomes high due to the strong sunlight in summer, making it difficult to produce seedlings smoothly. Rise. Thus, seedling production and seedling quality are susceptible to weather.

The seedling production method (C) above is a closed artificial environment equipped with an air conditioner, an artificial light source, a carbon dioxide fertilization device and a watering device in a structure closed with a heat insulating wall that does not transmit natural light. It is a method to produce high-quality seedlings. In a closed environment, the space required for seedling production is optimal for the growth of seedlings, depending on various environmental conditions such as light quality, light irradiation intensity, irradiation time, temperature, humidity, carbon dioxide gas concentration, irrigation amount, and fertilization concentration. state can be adjusted.

In recent years, even in the cultivation of seedlings of the Solanaceae family, it has been reported that various growth disorders occur as the production method (C) is becoming more popular. Among them, as a growth disorder whose cause is not clear, protrusion-like bumps appear on the leaves and stems of seedlings, and in severe cases, symptoms such as curling of the leaves, yellowing of the leaves, and defoliation are observed. So-called "leaf galls" have been reported.

Japanese Patent Application Laid-Open No. 2001-346450 Japanese Unexamined Patent Application Publication No. 2008-212078

SUMMARY OF THE INVENTION An object of the present invention is to provide a seedling cultivation apparatus and a cultivation method capable of solving the above-mentioned problems, suppressing the growth disorder "leaf galls", and stably producing high-quality Solanaceae seedlings. and

As a result of repeated research to solve the above problems, the present inventors have found that in the cultivation of seedlings, the lighting device is equipped with a semiconductor lighting device that irradiates at least a wavelength region of 450 to 660 nm, and a wavelength region of 295 nm or more and less than 320 nm. It was found that leaf galls occurring in the leaves and stems of Solanaceae seedlings are suppressed by using an illumination device with a UV intensity of 2.5 μW/cm ² or more. The present invention is based on such findings, and has the following gist.

[1] A cultivation device for cultivating seedlings of a plant belonging to the Solanaceae family, the cultivation device comprising a lighting device, the lighting device including a semiconductor lighting device that emits light in a wavelength range of at least 450 to 660 nm, the lighting device. is a seedling cultivation apparatus having a UV intensity of 2.5 μW/cm ² or more in a wavelength region of 295 nm or more and less than 320 nm on a seedling cultivation surface.

[2] The seedling cultivation apparatus according to [1], wherein the illumination device has a photosynthetically active photon flux density of 50 μmol/m ² /sec or more measured on the cultivation surface of the seedling.

[3] The cultivation apparatus is arranged in a closed structure, is provided with an air conditioner for air conditioning the inside of the closed structure, and is provided with a watering device for watering the seedlings [ 1] or the seedling cultivation apparatus according to [2].

[4] The seedling cultivation apparatus according to [3], wherein the humidity inside the closed structure is 30 to 100%.

[5] The seedling cultivation apparatus according to any one of [1] to [4], wherein the illumination device has a UV intensity of 500 μW/cm ² or less in a wavelength region of 295 nm or more and less than 320 nm on the seedling cultivation surface.

[6] The lighting device has a ratio I ₁ /I between the UV intensity I ₁ in the wavelength region of 295 nm or more and less than 320 nm on the seedling cultivation surface and the light intensity I ₂ in the wavelength region of 450 to 660 nm on the seedling cultivation surface. The seedling cultivation apparatus according to any one of [1] to [5], wherein ₂ is 0.0001 to 0.01.

[7] A seedling cultivation method for cultivating Solanaceae seedlings using the seedling cultivation apparatus according to any one of [1] to [6].

[8] The seedling cultivation method according to [7], wherein the seedling is a seedling of tomato, green pepper or eggplant.

According to the Solanaceae seedling cultivation apparatus of the present invention, it is possible to suppress leaf galls occurring in the leaves and stems of Solanaceae seedlings, and to stably produce high-quality seedlings.

1a and 1b are horizontal cross-sectional views of the cultivation apparatus according to the embodiment, FIG. 1a being a cross-sectional view taken along line Ia-Ia in FIG. 2b, and FIG. 1b being a cross-sectional view along line Ib-Ib in FIG. 2b. 2a is a sectional view taken along line IIa-IIa of FIG. 1a, and FIG. 2b is a sectional view taken along line IIb-IIb of FIG. 1a. FIG. 3 is a front view of the multi-shelf plant growing apparatus according to the embodiment. FIG. 4 is a cross-sectional view taken along line IV--IV of FIG. FIG. 5 is a plan view of a tray of the multi-shelf plant growing apparatus according to the embodiment. 6 is a perspective view of the tray of FIG. 5. FIG. FIG. 7 is a cross-sectional view taken along line VII--VII of FIG. FIG. 8 is a bottom view of the artificial illuminator. 9 is a cross-sectional view taken along the line IX-IX of FIG. 8. FIG. FIG. 10 is a cross-sectional view of a tray of a multi-shelf plant growing apparatus according to another embodiment.

A seedling cultivation apparatus of the present invention is for cultivating seedlings of a plant belonging to the Solanaceae family, and includes a lighting device. The lighting device includes a semiconductor lighting device that irradiates at least a wavelength region of 450 to 660 nm, and the UV intensity in the wavelength region of 295 nm or more and less than 320 nm on the seedling cultivation surface is 2.5 μW/cm ² or more.
In the present invention, the "light intensity on the seedling cultivation surface" such as UV light (hereinafter sometimes referred to as "cultivation surface UV intensity" or "cultivation surface light intensity") is the spectral irradiance at the position of the leaf of the seedling. This value is measured with the light receiving surface of the meter placed horizontally and upward.
The irradiation time of light to the seedlings by the lighting device is preferably about 8 to 20 hours, particularly about 12 to 18 hours per day.

Solanaceous plants include tomatoes, eggplants, green peppers, paprika, green peppers, hot peppers, habaneros, jalapenos and the like, with tomatoes, green peppers and eggplants, especially tomatoes being preferred.

4. The illumination device used in the seedling cultivation apparatus of the present invention has a UV intensity on the cultivation surface of 2.5 μW/cm ² or more, preferably 3.0 μW/cm ² or more in the wavelength range of 295 nm or more and less than 320 nm. It is more preferably 0 μW/cm ² or more, still more preferably 6.0 μW/cm ² or more, and particularly preferably 10 μW/cm ² or more. By setting the UV intensity of the cultivation surface in the wavelength region of 295 nm or more and less than 320 nm to the above range, leaf galls occurring in the leaves and stems of Solanaceae seedlings can be suppressed, and normal seedlings can be stably produced. .

The upper limit of the UV intensity on the cultivation surface in the wavelength region of 295 nm or more and less than 320 nm is not particularly limited, but considering the damage to seedlings by ultraviolet rays and the effects on the eyes and skin of workers during cultivation work, it is 500 μW / cm ² or less. is preferably 400 μW/cm ² or less, more preferably 300 μW/cm ² or less, and particularly preferably 200 μW/cm ² or less.

The illumination device used in the seedling cultivation apparatus of the present invention preferably has a UV intensity of 0.5 μW/cm ² or more on the cultivation surface in a wavelength range of 320 nm or more, specifically 320 nm or more and less than 340 nm, and 1.0 μW. /cm ² or more, more preferably 1.5 μW/cm ² or more, and particularly preferably 2.0 μW/cm ² or more. By setting the UV intensity of the cultivation surface in the wavelength region of 320 nm or more and less than 340 nm within the above range, leaf galls occurring in the leaves and stems of seedlings can be further suppressed.

The upper limit of the UV intensity on the cultivation surface in the wavelength region of 320 nm or more and less than 340 nm is not particularly specified, but considering the effect on the eyes and skin of the worker during cultivation work, it is preferable to be 300 μW/cm ² or less. It is preferably 250 μW/cm ² or less, and even more preferably 200 μW/cm ² or less.

The illumination device used in the seedling cultivation apparatus of the present invention preferably has a UV intensity on the cultivation surface of 5.0 μW/cm ² or less, 3.0 μW/cm ² at a wavelength of less than 295 nm, specifically 280 nm or more and less than 295 nm. It is more preferably 1.5 μW/cm ² or less, particularly preferably 1.0 μW/cm ² or less. By setting the UV intensity of the cultivation surface in the wavelength region of 280 nm or more and less than 295 nm to the above range, it is possible to suppress the occurrence of UV damage such as leaf curling, curling, and death due to UV damage to seedlings.

The lower limit of the UV intensity on the cultivation surface in the wavelength range of 280 nm or more and less than 295 nm is not particularly limited, and is preferably as close to zero as possible.

The lighting device used in the seedling cultivation apparatus of the present invention preferably has a cultivation surface light intensity of 4000 μW/cm ² or more, more preferably 4500 μW/cm ² or more, and more preferably 5000 μW/cm in the wavelength range of 450 to 660 nm. It is more preferably ² or more, and particularly preferably 6000 μW/cm ² or more. Moreover, it is preferable that there is no wavelength region in which the light intensity is zero in the wavelength region of 450 to 660 nm. By setting the cultivation surface light intensity at a wavelength of 450 to 660 nm within the above range, it is possible to suppress the occurrence of leaf galls on the leaves and stems of seedlings, while suppressing abnormalities in the morphogenesis of seedlings, resulting in normal seedlings. can be cultivated more stably.

The upper limit of the cultivation surface light intensity with a wavelength of 450 to 660 nm is not particularly limited, but it is preferably 60000 μW/cm ² or less, and 50000 μW/cm ² or less from the viewpoint of suppressing the occurrence of growth disorders such as leaf scorch. It is more preferably 40,000 μW/cm ^{2 or less, and particularly preferably 30,000 μmW/cm 2 or} less.

In the lighting device used in the seedling cultivation apparatus of the present invention, the ratio K between the cultivation surface UV intensity I1 in the wavelength region of 295 nm or more and _less than 320 nm and the cultivation surface light intensity _I2 in the wavelength region of 450 to 660 nm is It is preferably 1/10000 to 1/100, ie 0.0001 to 0.01. By setting K within the above range, it is possible to suppress the occurrence of leaf galls on the leaves and stems of seedlings, suppress abnormal morphogenesis of seedlings, and cultivate more normal seedlings. is preferable. K is represented by the following formula.
K = I1 _{/ I2}

The lighting device used in the seedling cultivation apparatus of the present invention includes a semiconductor lighting device that emits light in a wavelength range of at least 450 to 660 nm. The semiconductor lighting device preferably has a first emission peak wavelength in the range of 400-480 nm. Having the first emission peak wavelength in the range of 400 to 480 nm suppresses the elongation of seedling internodes, making it possible to cultivate seedlings with short and firm hypocotyls.

The semiconductor lighting device preferably has a second emission peak wavelength in the range of 500-620 nm, more preferably in the range of 500-610 nm, even more preferably in the range of 500-600 nm. The second emission peak wavelength preferably has a half width of 100 nm or more, more preferably 120 nm or more, and even more preferably 140 nm or more. By setting the second emission peak wavelength of the semiconductor lighting device within the above range, abnormal morphogenesis of seedlings can be suppressed, and normal seedlings can be cultivated more efficiently.

In the seedling cultivation apparatus of the present invention, at least a part of the lighting devices may be lighting devices that irradiate the above-described UV light. For example, all of the lighting devices to be used may be lighting devices having the above-described UV irradiation function, and among the lighting devices to be used, some lighting devices shall have the above-described UV irradiation function, and the remaining lighting devices The device may not have the UV irradiation function described above. A lighting device with high UV intensity and a lighting device with low UV intensity or no UV light irradiation may be used together.

In the seedling cultivation apparatus of the present invention, the photosynthetically active photon flux density measured on the cultivation surface of the seedling is preferably 50 μmol/m ² /sec or more, more preferably 100 μmol/m ² /sec or more. , 200 μmol/m ² /sec or more. By making the photosynthetically active photon flux density of the cultivation surface equal to or higher than the above lower limit, the photosynthesis of the seedlings can be made more efficient, and the occurrence of leaf galls can be further suppressed, which is preferable.

The lighting device used in the seedling cultivation apparatus of the present invention is not particularly limited, and lighting devices such as fluorescent lamps, semiconductor lighting such as organic EL, lasers, and LEDs can be used. Considering power consumption and ease of finer wavelength control, it is preferable to use LEDs.

Preferably, the cultivation apparatus is arranged in a closed structure, includes an air conditioner that air-conditions the inside of the closed structure, and a watering device that waters the seedlings.

The humidity within the closed structure is preferably in the range of 30-100%, more preferably in the range of 40-99%, and even more preferably in the range of 40-95%. By keeping the humidity within the closed structure within the above range, it is possible to suppress the occurrence of various growth disorders that occur in Solanaceae seedlings.

In one aspect of the present invention, the seedling cultivation apparatus has a growing module with an open front surface, and the growing module forms a seedling-raising space by arranging seedling-raising racks in multiple stages in the vertical direction.

A preferred form of such a cultivation apparatus will now be described with reference to FIGS. 1a-9 and 10. FIG. As shown in FIGS. 1a to 2b, a plurality of box-shaped multi-tiered plants (six in the illustrated example) are grown in a room of a completely light-shielding closed building structure 1 surrounded by heat-insulating walls. Devices (seedling growing modules) 3 to 8 are installed. The room 1 has a rectangular shape in plan view, and a door 2 is provided on one lateral wall surface 1i.

In this embodiment, the three multi-shelf plant growing apparatuses 3 to 5 are arranged in a line so that their open front faces face the same direction, and the three multi-shelf plant growing apparatuses 6 to 8 are also arranged in one row. They are arranged in one row so that the open front faces face the same direction, and two rows are arranged in the room so that the open front faces face each other. Hereinafter, the extending direction of the rows of the multi-shelf plant growing apparatuses 3 to 5 and 6 to 8 (longitudinal direction of the room) is referred to as the Y direction, and the lateral direction of the room (the multi-shelf plant growing apparatuses 3 to 5 and the multi-stage The direction in which the shelf-type plant growing apparatuses 6 to 8 face each other) is sometimes referred to as the X direction. Between these two rows of multi-shelf plant growing apparatuses 3 to 5 and 6 to 8, there is provided a space A large enough for one or more workers to work. A space B with a width of about 50 to 500 mm is provided between the longitudinal wall surfaces 1j and 1k of the room and the rear surfaces of the multi-shelf plant growing apparatuses 3-8, and the multi-shelf plant growing apparatuses 3-8 are passed through. air passages.

One end side of the rows of the multi-shelf plant growing apparatuses 3 to 5 and 6 to 8 is in contact with the building wall surface 1h on the side opposite to the door 2. As shown in FIG. The other end side of the rows of the multi-shelf plant growing apparatuses 3 to 5 and 6 to 8 is slightly separated from the wall surface 1i on the door 2 side.

When warmed air flows into the space A from the above-mentioned separated space of the wall surface 1i on the side of the door 2, a control plate for suppressing this flow can be provided at an appropriate location.

It is preferable to install an air curtain on the inner side of the door 2 for entering and exiting the room because it can prevent outside air from entering when the worker enters and exits the room.

As shown in FIGS. 3 and 4, the multi-shelf plant growing apparatuses 3 to 8 each have a pedestal 3c, left and right side panels 3a, a back panel 3b, and a top panel 3e at the zenith, and the front is open. It has a box structure. Inside this box-shaped structure, a plurality of seedling racks 12 are arranged in multiple stages at regular intervals in the vertical direction.

The height of each of the multi-shelf plant growing apparatuses 3 to 8 is about 2000 mm, which is a height that allows workers to work. A plurality of resin cell trays arranged in a shape can be placed side by side, and the width of the upper space of each shelf 12 can be adjusted to a constant temperature and humidity, for example, about 1000 mm to 2000 mm. 1000 mm is preferred. A plurality of cell trays 40 (see FIG. 1b) are placed substantially horizontally on each seedling rack 12. As shown in FIG. The dimensions of one cell tray are generally about 300 mm in width and 600 mm in depth.

The seedling rack 12 at the bottom is mounted on the pedestal 3c. The levelness of the seedling rack 12 can be adjusted by an adjuster (not shown) provided on the base 3c.

Each seedling rack 12 is provided with a watering device 30, which will be described later.

An artificial illuminator 13 is installed on the lower surface of each seedling rack 12 and the top panel 3e on the second or higher stage from the bottom, and the plants growing on the cell tray 40 of the seedling rack 12 directly below each artificial illuminator 13 are irradiated with light. is configured to In this embodiment, the artificial illuminators 13 other than the top are attached to the underside of the irrigation tray 31, which will be described later.

Details of the configuration of this artificial illuminator 13 are shown in FIGS. 8 is a bottom view of the artificial illuminator 13, and FIG. 9 is a sectional view taken along line IX-IX of FIG. This artificial illuminator 13 has a plurality of pairs (six pairs in this embodiment) of sockets 13b attached to the lower surface of a box 13a, and both ends of a fluorescent lamp 13c are attached to the sockets 13b, 13b. A switch 13s is installed on the bottom surface of the box 13a.

The box 13a is a box-like body having a top plate 13d and a bottom plate 13e, and the bottom plate 13e also serves as a reflector for reflecting light from the fluorescent lamp 13c. A power supply unit 13g containing electric circuit members 13f such as a ballast, an inverter, a constant current circuit, a constant voltage circuit, and a current limiting resistor is installed in the box 13a. In this embodiment, three power supply units 13g are provided between the fluorescent lamps 13c, that is, between the fluorescent lamps 13c of the first and second rows, between the fluorescent lamps 13c of the third and fourth rows, and between the fluorescent lamps 13c of the third and fourth rows. It is arranged between the fluorescent lamps 13c of the 1st and 6th columns. Each power supply unit 13g is attached to the bottom plate 13e of the box 13a. A gap of about 3 to 30 mm is provided between each power supply unit 13g and the top plate 13d of the box 13a. In this artificial illuminator 13, the heat generated by the power supply unit 13g is transferred to the bottom plate 13e and radiated from the bottom plate 13e. That is, it is transmitted to the air flowing through the seedling-raising space below the artificial lighting device 13 . Heat from the fluorescent lamp 13c is also transferred to this air flow.

Since there is a gap between the power supply unit 13g and the box top plate 13d, the amount of heat transmitted from the power supply unit 13g to the top plate 13d is extremely small. Therefore, the nutrient solution flowing on the irrigation tray 31 and the rhizosphere of the plant planted on the cell tray 40 are prevented from being warmed by the heat of the artificial illuminator 13 .

As shown in FIG. 4, ventilation holes are provided in the back panel 3b behind the space (seedling space) between the seedling shelves 12 and between the uppermost seedling shelf 12 and the top plate panel 3e. An air fan 15 is attached to each.

By providing the air fan 15 on the rear side of each seedling-raising space in this way, the air flow in the seedling-raising space becomes uniform, which is preferable.

An air conditioner 9 is installed in the upper part of the room and has a function of adjusting the temperature and humidity of the air in the room and circulating the air whose temperature and humidity are adjusted to the set conditions. The air conditioner 9 has an air conditioner main body (air conditioner) 9A having a heat exchanger, and a wind direction control plate 10 attached to the lower surface of the air conditioner main body 9A. The compressor of the air conditioner body 9A is installed outside the building structure 1 .

In this embodiment, the air conditioner body 9A is positioned above the center of the room in plan view of the room. The intake port 9a of the air conditioner main body 9A is provided on the lower surface of the air conditioner main body 9A, and the wind direction control plate 10 is provided with an opening 10a at a position overlapping the intake port 9a.

The air conditioner main body 9A is attached to the ceiling 1t of the building structure, and has a structure in which the side surface is exposed to the inside of the room. Air outlets 9b are provided on four side surfaces of the air conditioner main body 9A.

The wind direction control plate 10 has a portion around the opening 10a that overlaps the intake port 9a of the air conditioner main body 9A. The opening 10a is the same size as or larger than the inlet 9a.

The wind direction control plate 10 is supported on the ceiling 1t by a hanger (not shown).

One end of the wind direction control plate 10 in the Y direction is in contact with the wall surface 1h. The other end side of the wind direction control plate 10 in the Y direction extends closer to the wall surface 1i than the multi-shelf plant growing apparatuses 3 to 5 and 6 to 8, but is slightly away from the wall surface 1i. An upright plate 10r is erected over the entire length of the other end side of the wind direction control plate 10, and the upper end of the upright plate 10r is in contact with the ceiling 1t.

The wind direction control plate 10 extends in the X direction between the ceiling 1t and the upper surfaces of the multi-shelf plant growing apparatuses 3-8.

As shown in FIG. 2a, both ends of the wind direction control plate 10 in the X direction are vertically above or behind the front surfaces of the space A side of the multi-shelf plant growing apparatuses 3 to 5 and the multi-shelf plant growing apparatuses 6 to 8. It is located on the space B side. The horizontal distance L between both ends of the wind direction control plate 10 in the X direction and the front surfaces of the multi-shelf plant growing apparatuses 3 to 5 and 6 to 8 may be 0 mm, but is preferably 30 mm or more, more preferably 40 mm. 90 mm or more, more preferably 140 mm or more.

In this embodiment, an outlet 9f of the air conditioner 9 is provided between both ends of the wind direction control plate 10 in the X direction and the ceiling 1t. The air outlet 9f may overlap the front surfaces of the multi-shelf plant growing apparatuses 3 to 8 in a plan view of the cultivation apparatus, but is preferably located behind the front surfaces by the distance L.

In this embodiment, an intake port 9a of an air conditioner main body 9A serves as an air intake port of the air conditioner 9. As shown in FIG. This intake port is positioned forward of the front surfaces of the multi-shelf plant growing apparatuses 3 to 8, that is, on the space A side in plan view of the cultivation apparatus.

By operating the air fan 15, a circulation flow of air is generated in the room as indicated by the arrows in FIG. 2a. That is, the air whose temperature and humidity are controlled by the air conditioner 9 is sucked into the seedling growing space on each stage of the seedling growing shelf 12 from the space A on the open front side of the multi-shelf plant growing devices 3 to 8, and then from the air fan 15 to the rear side. It is discharged to the rear of the panel 3b, rises through the space B between the rear of the rear panel 3b and the building wall surface, passes through the upper space C of the multi-shelf plant growing devices 3 to 8, and is blown out from the air conditioner 9. After being mixed with the supplied air and subjected to temperature and humidity control, it passes through between the wind direction control plate 10 and the multi-shelf plant growing apparatuses 3 to 8 and again into the space on the open front side of the multi-shelf plant growing apparatuses 3 to 8. Blown to A.

Also, part of the air that is about to flow into the space A through the space between the airflow direction control plate 10 and the multi-shelf plant growing devices 3 to 8 passes through the opening 10a and enters the intake port 9a of the air conditioner main body 9A. After the temperature and humidity are adjusted, the air is blown out from the outlet 9f through the outlet 9b.

As shown in FIGS. 1a to 2b, when two rows of multi-shelf plant growing apparatuses 3 to 5 and multi-shelf plant growing apparatuses 6 to 8 are arranged so that a working space is formed between them, this The working space also functions as a space A for air circulation, forming an effective circulation flow.

When the circulating flow passes through each seedling-raising space of the multi-shelf plant growing apparatuses 3 to 8, the circulating flow is accompanied by water vapor evaporated from the watering device, the culture medium, the plants, etc., and the heat emitted from the artificial lighting device 13. By continuously circulating this circulating flow with the temperature and humidity controlled by the air conditioner 9, it is possible to maintain the temperature and humidity environment in the room optimal for the growth of the plant body. The flow velocity of air flowing through the seedling-raising space is preferably 0.1 m/sec or more, more preferably 0.2 m/sec or more, and even more preferably 0.3 m/sec or more. If the airflow velocity is too high, there is a risk of causing problems in plant growth, so it is generally preferred that the airflow velocity is 2.0 m/sec or less.

In this embodiment, the airflow is flowed from the front of the seedling-raising space through the fan 15 to the space B on the back side of the shelf in a state of negative pressure. good too. However, the airflow in the seedling-raising space is more uniform if the air is flown from the front side to the rear side of the shelf under a negative pressure.

In this embodiment, a watering tray 31 of a watering device (bottom watering device) 30 constitutes a shelf plate of each seedling-raising shelf 12, and water is watered from the bottom surface of the cell tray 40 placed on the watering tray 31. ing. A configuration example of the watering device 30 will be described with reference to FIGS. 5 to 7. FIG. 5 is a plan view of the sprinkling device, FIG. 6 is a perspective view, and FIG. 7 is a cross-sectional view taken along line VII-VII of FIG.

This irrigation apparatus 30 has a quadrangular irrigation tray 31 having a bottom plate 31d with side walls 31a, 31b, 31c erected on the rear and left and right sides thereof. A drainage groove 32 is provided on the front side of the irrigation tray 31 without side walls so as to be connected to the bottom plate 31d, and one end of the drainage groove 32 is formed with a drainage port 32a. The drain 32 and the bottom slab 31 d are partitioned by a weir 34 , and the nutrient solution flows out into the drain 32 through notches 34 a at both ends of the weir 34 . Along the side wall 31a on the rear side of the irrigation tray 31, a water supply pipe 33 for supplying the nutrient solution into the irrigation tray 31 is provided. 31.

A plurality of ribs 35 having a height of about 7 mm are provided on the upper surface of the irrigation tray bottom plate 31d and extend parallel to each other toward the drainage groove 32. The cell tray 40 is placed on these ribs 35. ing.

As shown in FIG. 4, in this watering device 30, when the watering tray 31 is placed on the seedling rack 12 of the multi-shelf plant growing devices 3-8, the drainage groove 32 protrudes from the open front surface of the growing devices 3-8. dimensioned. By protruding the drain groove 32 from the open front surface of the growing apparatus, the nutrient solution discharged from the drain outlet 32a of the drain groove 32 of the watering tray 31 placed on each stage of the seedling rack 12 is collected and discharged to the outside of the building structure 1. Easier to eject.

When the nutrient solution is continuously supplied from the small hole 33a provided in the water supply pipe 33 of the irrigation device 30, the nutrient solution is dammed up by the weir 34 and accumulates to a predetermined water level to form a pool. While the nutrient solution is being supplied from the water supply pipe 33, the nutrient solution flows out to the drainage groove 32 little by little from the notch 34a. By adjusting the amount of nutrient solution supplied and the amount of outflow from the notch 34a, it is preferable to maintain a pool state with a water level of about 10 to 12 mm in the irrigation tray 31, for example. Water is sucked up into the medium in the cells by capillary action through the cell holes 42 formed in the bottom of each cell 41 of the cell tray 40 placed on the rib 35, and the medium in all the cells 41 is filled with water in a short period of time. become saturated.

An artificial illuminator 13 is attached to the lower surface of the bottom plate 31 d of the irrigation tray 31 . In this embodiment, the top plate 13d of the box 13a of the artificial illuminator 13 is in direct contact with the lower surface of the watering tray 31, but a spacer or heat insulating material may be interposed.

In this watering device 30, the upper surface of the bottom plate 31d of the watering tray 31 is inclined toward the drainage groove 32 as shown in FIG. As a result, the nutrient solution can be drained to the drainage groove 32 in a short period of time when watering is stopped. Further, when the upper surface of the bottom plate 31d is inclined, the height of the ribs 35 is changed so that the tops 35a of the ribs are horizontal. can be held to

FIG. 10 shows another example of the irrigation apparatus used in the present invention, and the same members as those in FIGS. 5 to 7 are given the same reference numerals. In this watering device 30 ′, when the cell tray 40 is placed on the bottom plate 31 d of the watering tray 31 , the undertray 50 is interposed between the bottom plate 31 d and the cell tray 40 . The undertray 50 has sufficient rigidity to support the cell tray 40 containing the culture medium in each cell 41, and has a plurality of small holes 51 formed on its bottom wall surface and a plurality of small holes 51 on its back surface. are formed. These protrusions 52 function as gap holding means for holding a gap between the bottom plate 31 d and the bottom surface of the cell tray 40 when the cell tray 40 is accommodated in the irrigation tray 31 together with the undertray 50 .

10, when the nutrient solution is supplied from the water supply pipe 33 and the pool is at a predetermined water level, the nutrient solution is introduced into the undertray 50 through the small holes 51 of the undertray 50. , water is sucked up from the cell hole 42 formed in the bottom surface of each cell 41 of the cell tray 40 to the culture medium in the cell by capillary action.

In FIG. 10 as well, the artificial illuminator 13 is attached to the lower surface of the bottom plate 31d of the irrigation tray 31. As shown in FIG.

As described above, the cell tray 40 placed on the watering tray 31 is formed by arranging tens to hundreds of cells 41 in a grid and integrating them into a tray shape. 300 mm and a depth of about 600 mm, but not limited to this.

In order to artificially supply the carbon dioxide consumed by the seedlings in photosynthesis, as shown in FIGS. Carbon dioxide gas is supplied from the carbon dioxide cylinder 16 so that the carbon dioxide gas concentration inside becomes constant.

By cultivating seedlings using this seedling cultivation apparatus, it is possible to automatically adjust environmental conditions suitable for growing seedlings, such as the amount of light, temperature, humidity, carbon dioxide, and moisture. In addition, since all the seedlings on each nursery rack can grow under the same environment, the uniformity of the quality of the obtained seedlings can be improved.

In this embodiment, since the air outlet 9f of the air conditioner 9 is located 30 mm or more behind the front surface of the multi-shelf plant growing apparatuses 3-8, the multi-shelf plant growing apparatuses 3-8 (cultivating modules) are installed. The air warmed through the passage and the air cooled by the air conditioner 9 are mixed and flow into the space A. As a result, the air flowing into the space A has a uniform temperature and is taken into each of the multi-shelf plant growing apparatuses 3-8.

When the air cooled by the air conditioner 9 flows directly into the space A, the cold air is partially taken in from the front of the multi-shelf plant growing apparatuses 3 to 8, so that the temperature between the multi-shelf plant growing apparatuses 3 to 8 increases. unevenness occurs, resulting in uneven plant growth.

In this embodiment, since the main body 9 of the air conditioner and the air direction control plate 10 are integrated, it is not necessary to install many duct pipes, etc., which is preferable.

In this multi-shelf plant growing apparatus, the heat of the artificial illuminator 13 is transmitted to the box bottom plate 13e, which also serves as a reflector, and is transmitted from the bottom plate 13e to the air flowing through the seedling-raising space. Significantly less heat is transferred from the artificial light 13 to the upper irrigation tray 31 . Therefore, the temperature of the nutrient solution on the watering tray 31 is controlled within a predetermined range.

In the present invention, the ratio Wb/Wa between the total cooling capacity (Wb) of all air conditioners 9 and the total power consumption (Wa) of all lighting devices (fluorescent lamps 13c in the above embodiment) is 1 or more and 5 It is preferably 1 or more, more preferably 1 or more and 4 or less, even more preferably 1 or more and 3 or less, and particularly preferably 1 or more and 2 or less. By setting Wb/Wa within the above range, it is possible to keep the environment in the closed space appropriate and constant, and furthermore, it is possible to further reduce environmental changes caused by turning on and off the air conditioning. Ws is the power consumption per lighting device such as a fluorescent lamp, n is the number of lighting devices, Wk is the cooling capacity of one air conditioner, and m is the number of air conditioners installed. is represented by A in the following formula.

A = Wb/Wa
= (Wk×m)/(Ws×n)
m: Number of air conditioners (units)
n: Number of lighting devices (number)

The above embodiment is an example of the present invention, and the present invention is not limited to this. For example, the size of the room in the closed building structure and the number of multi-shelf plant growing apparatuses installed may be other than those described above. Also, the main body of the air conditioner may be installed in a place other than the central part. Two or more air conditioner main bodies may be installed, but it is preferable that the number is as small as possible.

Examples and comparative examples are described below. In the following examples and comparative examples, a seedling cultivation apparatus having the structure shown in FIGS. cultivated.

[Measurement of UV intensity, light intensity, and photosynthetically effective photon flux density]
A spectral irradiance meter (product name: S-2431 model II) manufactured by Soma Optical Co., Ltd. was used to measure the UV intensity, light intensity, and photosynthetically active photon flux density in each wavelength range on the cultivation surface. Measurement was performed with the light receiving surface of the spectral irradiance meter placed horizontally upward at the position of the leaf of the seedling.

[Evaluation of seedling growth]
Tomato seedlings were grown for 12 days under the conditions shown in Table 1, using a seedling cultivation apparatus using a lighting device, lighting for 16 hours per day. The growing condition was evaluated according to the following criteria. Table 1 shows the results.
VG (very good): no occurrence of leaf galls.
G (good): Some seedlings have mild leaf galls. (Some of the seedlings have protruding bumps on the leaves, but the degree is slight, and severe yellowing and defoliation are not seen on the leaves.)
NG (bad): Leaf galls occur in many seedlings, and serious symptoms are observed. (Many seedlings develop leaf bumps, leaf curling, severe yellowing, and defoliation.)

<Examples 1 to 7, Comparative Examples 1 to 4>
Two multi-stage shelf plant growing apparatuses 3 with 5 stages and 3 shelves are installed in a completely closed space in a closed building structure 1 (internal dimensions: depth 450 cm, width 300 cm, height 240 cm), and tomatoes are grown. (Dimensions of cell tray 40: depth 60 cm, width 30 cm). As the air conditioner, one air conditioner with a cooling capacity of 14 kW was installed. Table 1 shows the results obtained.

As shown in Table 1, in Examples 1, 2 and 7, leaf galls did not develop and seedlings in extremely good growth conditions could be grown. In Examples 3 to 6, leaf galls were slightly developed, but did not lead to yellowing of the leaves or defoliation, resulting in only minor symptoms. On the other hand, good results were not obtained in Comparative Examples 1 to 4, in which the UV intensity of the cultivated surface at 295 nm or more and less than 320 nm was lower than 2.5 μW/cm ² . Specifically, in Comparative Examples 1, 2 and 4, leaf galls developed, causing serious growth failure leading to yellowing of leaves and defoliation. As a result, the leaves curled up and died.

The above-described embodiment is an example of the present invention, and the present invention may be in forms other than those shown in the drawings.
This application is based on Japanese Patent Application No. 2016-111043 filed on June 2, 2016, which is incorporated by reference in its entirety.

1 closed building structure 3-8 multi-shelf type plant growing device 3a side panel 3b rear panel 3c pedestal 3e top panel 9 air conditioner 9A main body of air conditioner 9a inlet 9b outlet 9f outlet 10 wind direction control plate 10a opening 12 Seedling shelf 13 Artificial illuminator 13a Box 13b Socket 13c Fluorescent lamp 13d Top plate 13e Bottom plate 13f Electric circuit member 13g Power supply unit 13s Switch 15 Air fan 16 Carbon dioxide gas cylinder 30, 30' Watering device 31 Watering tray 31d Bottom plate 32 Drain 32a Drain port 33 water supply pipe 33a small hole 34 weir 34a notch 35 rib 40 cell tray 41 cell 42 cell hole 50 undertray 51 small hole 52 projection

Claims (10)

A method for cultivating seedlings of a plant of the Solanaceae family, comprising:
The cultivation device is a cultivation device equipped with a lighting device,
The lighting device includes a semiconductor lighting device that emits light in a wavelength range of at least 450 to 660 nm,
The illumination device is a seedling cultivation device in which the UV intensity in the wavelength region of 295 nm or more and less than 320 nm on the seedling cultivation surface is 2.5 μW/cm ² or more, and the method for cultivating the seedlings of Solanaceae is the leaf knob of the seedlings. A seedling cultivation method that suppresses disease,
The seedling cultivation method, wherein the illumination device irradiates the seedlings with light for 8 to 20 hours per day. The UV intensity in the wavelength region of less than 295 nm on the cultivation surface of the seedling is 5.0 μW / cm ² below The seedling cultivation method according to claim 1. Cultivation surface UV intensity in the wavelength range of 320 nm or more and less than 340 nm is 0.5 μW / cm ² 300 μW/cm or more ² The method for cultivating seedlings according to claim 1, wherein: The UV intensity in the wavelength region of less than 295 nm on the cultivation surface of the seedling is 5.0 μW / cm ² below Yes, the cultivation surface UV intensity in the wavelength range of 320 nm or more and less than 340 nm is 0.5 μW / cm ² 300 μW/cm or more ² The method for cultivating seedlings according to claim 1, wherein: The seedling cultivation method according to any one of claims 1 to 4 , wherein the illumination device has a photosynthetically active photon flux density of 50 µmol/m ² /sec or more measured on the cultivation surface of the seedling. The cultivation device is arranged in a closed structure,
An air conditioner is provided for air conditioning the inside of the closed structure,
The seedling cultivation method according to any one of claims 1 to 5, further comprising a watering device for watering the seedlings. The method for cultivating seedlings according to claim 6 , wherein the humidity in said closed structure is 30 to 100%. The seedling cultivation method according to any one of claims 1 to 7 , wherein the illumination device has a UV intensity of 500 μW/cm ² or less in a wavelength region of 295 nm or more and less than 320 nm on the seedling cultivation surface. In the lighting device, the ratio I ₁ /I ₂ between the UV intensity I1 in the wavelength region of 295 nm or more and less than 320 nm on the seedling cultivation surface and the light intensity I2 in the wavelength region of 450 to 660 nm on the seedling cultivation surface is 0.00. 9. The method for cultivating seedlings according to any one of claims 1 to 8 , wherein the ratio is 0001 to 0.01. The method for cultivating seedlings according to any one of claims 1 to 9 , wherein the seedlings are seedlings of tomatoes, green peppers or eggplants.

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