WO2013088829A1

WO2013088829A1 - Plant-cultivation illumination device

Info

Publication number: WO2013088829A1
Application number: PCT/JP2012/076554
Authority: WO
Inventors: 山田　真; 石渡　正紀; 青木　慎一
Original assignee: パナソニック株式会社
Priority date: 2011-12-16
Filing date: 2012-10-13
Publication date: 2013-06-20
Also published as: JP2013126382A; TW201325439A; CN103929944A; CN103929944B; JP5874060B2; TWI459895B

Abstract

This plant-cultivation illumination device (1) is provided with a first light source (2) for irradiating a plant (P) with a light that includes a red-colored light component, and a second light source (3) for irradiating the plant (P) with a light that includes a far-red-colored light component. The irradiation operation of the light source (2) is controlled by a control unit (4). A time slot in which the control unit (4) operates is set by a time setting unit (5). The time setting unit (5) performs the setting so that the first light source (2) implements the irradiation operation during a time slot straddling the sunset, and thereafter the second light source (3) implements the irradiation operation for three hours or longer during a time slot lasting until sunrise. This makes it possible to promote the growth of the plant (P), because the plant (P) is irradiated with a light that includes a red-colored light component during a time slot straddling the sunset and is thereafter irradiated with a light that includes a far-red-colored light component.

Description

Plant breeding lighting device

The present invention relates to a plant-growing lighting device that regulates plant growth.

Conventionally, a method for adjusting the growth of a plant by irradiating the plant with light from an artificial light source is known. For example, in Japanese Patent Publication No. 2009-136155 (hereinafter referred to as Document 1), mixed light of red light and far-red light is used in the vicinity of the start period and the end period of the light period in the plant photoperiod, or There has been proposed a method of applying short-day treatment to a plant by irradiating the plant in both.

Further, for example, in Japanese Patent Publication No. 2007-282544 (hereinafter referred to as Reference 2), at least one of red light and far red light is applied to a solanaceous plant (especially tomato) for 1 to 3 hours after sunset. A method for increasing the fruit sugar content of the plant by irradiation has been proposed.

However, the method proposed in Document 1 is mainly for advancing the flowering time of plants and is not necessarily considered to promote plant growth. In addition, the method proposed in Document 2 increases the sugar content of the fruit and is not necessarily considered to promote the growth of plants, and is a method limited to solanaceous plants, so that it can be applied to other plants. It may not be possible.

This invention solves the said subject, and aims at providing the plant growth lighting apparatus which can promote the growth of a plant by irradiating the light from an artificial light source to a plant.

The plant growth lighting device of the present invention includes a light source that irradiates light to a plant, a first light source that irradiates light including a red light component in a wavelength range of 610 to 680 nm, and a far red color in a wavelength range of 685 to 780 nm. A second light source that emits light including a light component; a control unit that controls an irradiation operation of the first light source and the second light source; and the first light source and the second light source for the control unit. A time setting unit for setting a time zone for performing the irradiation operation, wherein the time setting unit has an irradiance of 0.005 W / m ² or more in a time zone in which the first light source sandwiches sunset, and 0. Irradiation operation is performed at a daily integrated irradiance of 015 kJ / m ² or more, and then the second light source emits irradiance of 0.02 W / m ² or more and 0.21 kJ / m for 3 hours or more in the time period until sunrise. It is set to irradiate with a daily integrated irradiance of ² or more.

In this plant growth lighting device, the integrated irradiance of light that the first light source irradiates in the time zone before sunset is greater than the integrated irradiance of light that the first light source irradiates in the time zone after sunset. It is preferable to control so that it may decrease.

In this plant growing lighting device, it is preferable that the integrated irradiance of light irradiated by the first light source is controlled to be smaller than the integrated irradiance of light irradiated by the second light source.

In this plant growing lighting device, the ratio of the cumulative irradiance of light irradiated by the first light source to the cumulative irradiance of light irradiated by the second light source is 0.05: 9.95 to 4.5. : It is preferable to be controlled to be 5.5.

According to the present invention, the plant is irradiated with light containing a red light component in a time zone sandwiching sunset, and then irradiated with light containing a far red light component, thereby promoting the growth of the plant. Can do.

It is the schematic of the plant cultivation lighting apparatus in embodiment of this invention. It is a figure which shows an example of the light irradiation pattern of the plant growth lighting apparatus in embodiment of this invention. It is a perspective view of the state where the 1st light source and the 2nd light source which constitute the plant growth lighting device in an embodiment of the present invention were stored in one case. It is a figure which shows the spectral transmittance | permeability of the far red light filter which comprises the red light filter which comprises the 1st light source of the plant growth lighting apparatus in embodiment of this invention, and the 2nd light source. It is a figure which shows the spectral characteristic of the light irradiated from the 1st light source and 2nd light source of the plant growth lighting apparatus in embodiment of this invention. It is a side view which shows an example of the state by which the 1st light source and 2nd light source of the plant growth lighting apparatus in embodiment of this invention are arrange | positioned with respect to the plant. It is a top view which shows an example of the state by which the 1st light source and 2nd light source of the plant growth lighting apparatus in embodiment of this invention were arrange | positioned with respect to the plant. It is a figure which shows the light irradiation pattern of the plant growth lighting apparatus in Example 1. FIG. It is a figure which shows the light irradiation pattern in the comparative example 1. FIG. It is a figure which shows the light irradiation pattern of the plant growth lighting apparatus in the comparative example 2. FIG. It is a figure which shows the light irradiation pattern of the plant growth lighting apparatus in the comparative example 3. It is a figure which shows the light irradiation pattern of the plant growth lighting apparatus in the comparative example 4. It is a figure which shows the light irradiation pattern of the plant growth lighting apparatus in the comparative example 5. FIG. The ratio (first integrated irradiance ratio) between the integrated irradiance of light irradiated by the first light source before sunset in the plant growing lighting device and the integrated irradiance of light irradiated by the light source after sunset, and chrysanthemum It is a figure which shows the relationship with the growth rate of a. Relationship between the ratio of the integrated irradiance of light from the first light source and the integrated irradiance of light from the second light source (second integrated irradiance ratio) and the growth rate of chrysanthemum in the plant growing lighting device FIG. It is a figure which shows the light irradiation pattern of the plant growth lighting apparatus in Example 2. FIG. It is a figure which shows the light irradiation pattern in the comparative example 6. FIG. It is a figure which shows the yield of the strawberry by Example 2 and Comparative Example 6.

A plant growth lighting device (hereinafter referred to as a lighting device) according to an embodiment of the present invention will be described with reference to FIGS. This lighting device promotes the growth of plants (especially flowers and fruits and vegetables) in a completely closed plant seedling production system, facility cultivation such as an agricultural vinyl house or glass house, or outdoor cultivation. .

As shown in FIG. 1, the illuminating device 1 is provided with the 1st light source 2 and the 2nd light source 3 as a light source which irradiates light with respect to the plant P planted in the fence F. As shown in FIG. The first light source 2 emits light containing a red light component, and the second light source 3 emits light containing a far red light component. In this case, the red light component from the first light source 2 has a wavelength region of 610 to 680 nm, and the far red light component from the second light source 3 has a wavelength region of 685 to 780 nm. These

light sources

2 and 3 are disposed above the plant P. The irradiation operation of the

light sources

2 and 3 is controlled by the control unit 4. The time zone in which the control unit 4 operates is set by the time setting unit 5. The

light sources

2 and 3 and the time setting unit 5 are electrically connected to the control unit 4 through distribution lines 6 respectively.

The first light source 2 includes a light emitter 21 and a red light filter 22 that mainly transmits a red light component of the light emitted from the light emitter 21. The light emitter 21 is configured by, for example, a red LED that emits red light, a red fluorescent lamp, a red EL element, or an incandescent lamp or HID lamp (such as a high-pressure sodium lamp or a xenon lamp) that emits light including red light. The red light filter 22 is configured by, for example, an optical filter subjected to color resin, color glass, or optical multilayer film processing. The first light source 2 is a 0.005 W / m ² or more irradiance, and irradiates light to the plant P in 0.015kJ / m ² or more integrated irradiance per day. The irradiance is measured using a Leica light meter Li-250 and a sensor Li-190SA. In this case, when the light emitter 21 is configured to emit light mainly having a wavelength region of 685 to 780 nm, the first light source 2 may not have the far red light filter 22. .

The second light source 3 includes a light emitter 31 and a far red light filter 32 that mainly transmits a far red light component of the light emitted from the light emitter 31. The light emitter 31 is, for example, a far-red LED that emits far-red light, a far-red fluorescent lamp, a far-red EL element, or an incandescent lamp or HID lamp (such as a high-pressure sodium lamp or xenon lamp) that emits light containing far-red light. Composed. The far-red light filter 32 is configured by, for example, an optical filter that has been subjected to color resin, color glass, or optical multilayer film processing. The second light source 3 irradiates the plant P with light having an irradiance of 0.02 W / m ² or more and an integrated irradiance of 0.21 kJ / m ² or more per day. Note that when the light emitter 31 is configured to irradiate light mainly having a wavelength region of 685 to 780 nm, the second light source 3 may not include the far red light filter 32.

The control unit 4 includes a microcomputer, a relay, a switch, and the like, and has a light control device that adjusts the irradiance of light emitted from the

light sources

2 and 3. A light control apparatus is comprised by the light controller, for example, and adjusts irradiance electrically.

The time setting unit 5 is constituted by a timer, a microcomputer, etc., and causes the

light sources

2 and 3 to irradiate at a time preset by the user. FIG. 2 shows a state in one day (24 hours) from before sunset to after sunrise. As shown in this figure, the time setting unit 5 shows that the light including red light from the first light source 2 is sunlight. Irradiation is performed in a time zone sandwiching the sun, and thereafter, light including far-red light from the second light source 3 is set to be irradiated for 3 hours or more in the time zone until sunrise. The red light irradiation from the first light source 2 and the far red light irradiation from the second light source 3 are normally performed continuously, but may overlap each other for a short time (for example, several minutes). There may be blanks.

In the case where the

light sources

2 and 3 are configured by a light emitter having a small amount of single light such as an LED, in order to secure a sufficient amount of light, each of the

light sources

2 and 3 has one casing as shown in FIG. 7 is preferably housed together. In this case, the housing 7 is preferably formed of a material having high thermal conductivity and excellent heat dissipation and high light reflectivity, for example, a metal material such as aluminum or stainless steel.

As shown in FIG. 4, the red light filter 22 is configured to have spectral transmittance with respect to light having a wavelength in the range of about 590 to 710 nm (curve A), for example. Is the highest for light of about 660 nm. Further, the far-red light filter 32 is configured to have spectral transmittance with respect to light having a wavelength of about 690 nm or more (curve B).

As shown in FIG. 5, the light C emitted from the first light source 2 constituted by the fluorescent lamp (the light emitter 21) and the red light filter 22 has the highest light intensity at a wavelength of about 660 nm, for example. . Further, the light D emitted from the first light source 2 constituted by the red LED (light emitter 21) has the highest light intensity at a wavelength of about 630 nm, for example.

The light E emitted from the second light source 3 composed of the fluorescent lamp (light emitter 31) and the far red light filter 32 has the highest light intensity at a wavelength of about 740 nm, for example. In addition, the light G emitted from the second light source 3 configured by the far red LED (light emitter 31) has the highest light intensity at a wavelength of about 735 nm, for example.

The

light sources

2 and 3 are usually arranged above the plant P. However, when the plant P is tall or has many branches and leaves, there is a possibility that a sufficient amount of light cannot be irradiated to the lower part or the inner part of the plant P only by the

light sources

2 and 3 disposed above. Therefore, as shown in FIG. 6, in addition to the upper first light source 2a and the upper second light source 3a (hereinafter referred to as the

upper light sources

2a and 3a) disposed above the plant P, the side or lower side of the plant P Alternatively, the

light sources

2 and 3 may be arranged. A side first light source 2b and a side second light source 3b (hereinafter referred to as side

light sources

2b and 3b) are arranged on the side of the plant P, and a lower first light source 2c and A lower second light source 3c (hereinafter referred to as

lower light sources

2c and 3c) is arranged. In this case, each of the

upper light sources

2a and 3a, the side

light sources

2b and 3b, and the

lower light sources

2c and 3c is movable vertically and horizontally depending on the size of the plant P (for example, the type and growth state of the plant P). For example, it may be fixed by a frame member that surrounds the periphery of the plant P. However, the present invention is not limited to this, and the frame members may be divided, and the

upper light sources

2a and 3a, the side

light sources

2b and 3b, and the

lower light sources

2c and 3c may be fixed by corresponding frame members. . Thereby, the plant P can be irradiated with a sufficient amount of light from the

light sources

2 and 3. Here, the attachment angles of the side

light sources

2b and 3b and the

lower light sources

2c and 3c can be adjusted so that light can be applied to the plant P at an arbitrary angle.

FIG. 7 shows the arrangement of the

upper light sources

2a and 3a, the side

light sources

2b and 3b, and the

lower light sources

2c and 3c with respect to the plant P when viewed from above. Here, in order to simplify the drawing, the

light sources

2 and 3 are shown as one member. The

upper light sources

2a and 3a are arranged so as to be substantially parallel to the direction Y (the direction in which the plants P are continuous) in which the ridges F extend, and a plurality of the

upper light sources

2a and 3a are arranged at predetermined intervals in the directions X and Y. The side

light sources

2b and 3b are waterproofed by being covered with a cylinder or the like, arranged so as to be substantially parallel to the direction Y in which the heel F extends, and in the direction X and the direction Y of the region between the heel F A plurality are arranged at predetermined intervals. The

lower light sources

2c and 3c are waterproofed by being covered with a cylinder or the like, arranged so as to be substantially parallel to the direction Y in which the ridge F extends, and in the direction X and the direction Y on the ground between the ridges F. A plurality are arranged at predetermined intervals. In this case, the

lower light sources

2c and 3c may be attached so as to irradiate light near the root of the plant P (near the cocoon F). For this reason, the attachment positions of the

lower light sources

2c and 3c are not limited to the ground between the fences F, and a predetermined interval may be provided above the ground (the direction in which the plant P grows and extends). . Thereby, even if it is a case where the plant P is continuing over the wide range with respect to the light irradiation range of each

light source

2 and 3, the plant P can be irradiated with sufficient quantity of light. The side

light sources

2b and 3b and the

lower light sources

2c and 3c may be configured by a continuous light source such as a hollow light guide type lighting device, an optical fiber, or an EL device formed in an elongated shape.

The light distribution and light amount of the

upper light sources

2a and 3a, the side

light sources

2b and 3b, and the

lower light sources

2c and 3c are adjusted according to the growth of the plant P. For example, when the plant P is in the initial growth stage and is still small, the

upper light sources

2a and 3a far from the plant P are turned off, and the side

light sources

2b and 3b and the

lower light sources

2c and 3c close to the plant P are turned on. . At this time, the side

light sources

2b and 3b and the

lower light sources

2c and 3c are adjusted so that light distribution is set narrow by adjusting their mounting angles and the light can be radiated intensively to the plant P. The Further, since the plants P in the initial growth stage have not yet sufficiently developed branches and leaves, the light irradiated to the plants P tends to spread throughout the plants P even if the amount of light is low. Therefore, it is preferable that the side

light sources

2b and 3b and the

lower light sources

2c and 3c respectively reduce the amount of light emitted.

On the other hand, when the plant P grows greatly, all of the

upper light sources

2a and 3a, the side

light sources

2b and 3b, and the

lower light sources

2c and 3c are turned on. At this time, the side

light sources

2b and 3b and the

lower light sources

2c and 3c are adjusted so that light distribution is widely set by adjusting their mounting angles and the like, so that light can be applied to a wide range of the plant P. The Moreover, since the plant P which grew greatly can have many branches and leaves, if the light irradiated with respect to the plant P is not high light quantity, it may not reach the inside of the plant P (the stem part of the plant P). Therefore, it is preferable that the

upper light sources

2a and 3a, the side

light sources

2b and 3b, and the

lower light sources

2c and 3c respectively increase the amount of light to be irradiated.

As for the growth promotion effect which the lighting device 1 configured as described above gives to the plant P, actually using the lighting device 1 cultivates chrysanthemums (variety: Say Prince) and about 80% of chrysanthemums are stems. It confirmed by calculating the average number of days required to become 80 cm or more in height.

Example 1
Chrysanthemum was planted in early November and harvested after approximately 3.5 months of cultivation until March of the following year. Immediately after planting, in order to maintain the vegetative growth of chrysanthemum, the dark period was interrupted for 4 hours at night by incandescent lighting. This dark period interruption was continued until the end of December 45 days after the start of planting when chrysanthemum stem length was 20 cm or more. Thereafter, the chrysanthemum was transferred to reproductive growth, and at the same time, the lighting device 1 started to irradiate the chrysanthemum. Light irradiation by the lighting device 1 was continued until the chrysanthemum flowered.

As the first light source 2, the above-described red LED was used (see FIG. 5). The first light source 2 was disposed above the chrysanthemum at a density of 5 / m ² , and the chrysanthemum was irradiated with red light at an irradiance of 0.005 W / m ² . As the second light source 3, the above-described far red LED was used (see FIG. 5). The second light source 3 is arranged into 20 / m above the chrysanthemum at a density of ^2, it was irradiated with far-red light irradiance of 0.02 W / m ² with respect chrysanthemum.

FIG. 8 shows a state in one day (24 hours) from before sunset to after sunrise, and as shown in this figure, the red light from the first light source 2 starts from 15 minutes before sunset. Irradiation was applied to chrysanthemum for a total of 1 hour until 45 minutes after Far-red light from the second light source 3 was applied to chrysanthemum for 3 hours from 45 minutes after sunset. That is, the red light from the first light source 2 and the far red light from the second light source 3 were continuously applied to the chrysanthemum. As a result, as shown in Table 1, the chrysanthemum according to the present example required an average of 90 days for the stem height to be 80 cm or more.

On the other hand, FIG. 9 shows a state in one day (24 hours) from before sunset to after sunrise, and in this comparative example 1, light from the

light sources

2 and 3 is not irradiated. Only sunlight was applied to chrysanthemum. As a result, as shown in Table 1, the chrysanthemum according to Comparative Example 1 required an average of 111 days for the stem height to be 80 cm or more. This result shows that the lighting device 1 efficiently promotes chrysanthemum growth.

FIG. 10 shows a state in one day (24 hours) from before sunset to after sunrise. In this comparative example 2, in addition to sunlight, red light from the first light source 2 is shown. Only the far red light from the second light source 3 was not irradiated. As a result, the chrysanthemum according to Comparative Example 2 required an average of 110 days for the stem height to be 80 cm or more as shown in Table 1. This result indicates that far-red light from the second light source 3 is required to significantly promote chrysanthemum growth.

FIG. 11 shows a state in one day (24 hours) from before sunset to after sunrise. In this comparative example 3, in addition to sunlight, far red light from the second light source 3 is shown. Only the light was irradiated, and the red light from the first light source 2 was not irradiated. Far-red light from the second light source 3 was irradiated for 3 hours immediately after sunset. As a result, as shown in Table 1, the chrysanthemum according to Comparative Example 3 required an average of 102 days for the stem height to be 80 cm or more. This result indicates that red light from the first light source 2 is necessary to significantly promote chrysanthemum growth.

FIG. 12 shows a state in one day (24 hours) from before sunset to after sunrise. In this comparative example 4, in addition to sunlight, red light from the first light source 2 is shown. Was irradiated for 1 hour from sunset 1 hour to sunset, and far-red light from the second light source 3 was irradiated for 3 hours immediately after sunset. As a result, as shown in Table 1, the chrysanthemum according to Comparative Example 4 required an average of 97 days for the stem height to be 80 cm or more. This result shows that it is important to irradiate red light from the first light source 2 across sunset in order to significantly promote chrysanthemum growth.

FIG. 13 shows a state in one day (24 hours) from before sunset to after sunrise, and in this comparative example 5, in addition to sunlight, red light from the first light source 2 is shown. Was irradiated for 1 hour immediately after sunset, and immediately after that, far-red light from the second light source 3 was irradiated for 3 hours. As a result, the chrysanthemum according to Comparative Example 5 required an average of 96 days for the stem height to be 80 cm or more as shown in Table 1. This result also shows that it is important to irradiate red light from the first light source 2 across the sunset in order to significantly promote chrysanthemum growth, as in Comparative Example 4 above. Yes.

In the present embodiment, the ratio of the accumulated irradiance R1 of red light irradiated by the first light source 2 before sunset to the accumulated irradiance R2 of red light irradiated by the first light source 2 after sunset ( The first cumulative irradiance ratio (R1 / R2) is 0.33 (calculated from 15 (minutes) / 45 (minutes)). FIG. 14 shows changes in the growth period (growth period) of chrysanthemum required for the stem height to be 80 cm or more when R1 / R2 is variously changed. When R1 was zero, that is, when red light from the first light source 2 was not irradiated to chrysanthemum before sunset, chrysanthemum took an average of 96 days to reach a stem height of 80 cm or more. From this state, increasing R1 promoted chrysanthemum growth and shortened the period required to reach 80 cm or more in stem length. This growth promoting effect was significant when R1 / R2 was in the range of 0.09 to 0.71, and R1 / R2 was not seen to be greater than 1. This result shows that R1 is preferably less than R2 in order to efficiently promote chrysanthemum growth.

In this embodiment, the ratio of the integrated irradiance R (= R1 + R2) of the light from the first light source 2 to the integrated irradiance FR of the light from the second light source 3 (second integrated radiation). The illuminance ratio (R / FR) is 0.083 (calculated from (0.005 W / m ² × 1 hour) / (0.02 W / m ² × 3 hours)). FIG. 15 shows changes in the growth period (growth period) of chrysanthemum required for the stem height to be 80 cm or more when the R / FR is variously changed. When R was zero, that is, when red light from the first light source 2 was not irradiated to chrysanthemum, it took 102 days on average for chrysanthemum to have a stem height of 80 cm or more. From this state, as R was increased, chrysanthemum growth was promoted, and the period required to reach a stem height of 80 cm or more was shortened. This growth promoting effect was particularly remarkable when R / FR was in the range of 0.005 to 0.82. As a result, in order to efficiently promote chrysanthemum growth, R is preferably less than FR, and in particular, R / FR is 0.005 (corresponding to R: FR = 0.05: 9.95). It is shown that it is preferable to set to 0.82 (corresponding to R: FR = 4.5: 5.5).

Next, the growth promotion effect given to the plant P by the lighting device 1 is actually cultivating strawberries (variety: Tochiotome) belonging to fruit and vegetables using the lighting device 1, and calculating the yield of strawberry (per 10 strains). Confirmed with.

(Example 2)
Strawberries were planted at the end of September and were harvested after being cultivated for approximately 6 months until March of the following year. Light irradiation to the strawberry by the lighting device 1 started in mid-November and continued until the strawberry was harvested.

As the

light sources

2 and 3, the same light sources as those in Example 1 were used. Further, the installation location and the number of installation of the

light sources

2 and 3 were also the same as those in Example 1. The first light source 2 irradiates red strawberries with an irradiance of 0.01 W / m ² , and the second light source 3 emits far red lights with irradiance 0.02 W / m ² to the strawberries. Irradiated.

FIG. 16 shows a state in one day (24 hours) from before sunset to after sunrise. In this example, in Example 2, the red light from the first light source 2 is 20 minutes after sunset. The strawberry was irradiated for a total of 2 hours from before to 100 minutes after sunset, and the far red light from the second light source 3 was irradiated to the strawberry for 3 hours from 100 minutes after sunset. That is, this indicates that the first cumulative irradiance ratio (R1 / R2) is 0.2 and the second cumulative irradiance ratio (R / FR) is 0.33. In contrast to Example 2, FIG. 17 shows a state in one day (24 hours) from before sunset to after sunrise, and in Comparative Example 6, light from

light sources

2 and 3 is irradiated. In addition to sunlight, the strawberry was irradiated with light from an incandescent lamp for 5 hours immediately after sunset.

As a result, as shown in Table 2, the total yield of strawberries according to Example 2 was 14222 grams, and the total yield of strawberries according to Comparative Example 6 was 11,653 grams, which was about 20% less than that of Example 2. From this, also in this example, in order to promote the growth of strawberry and improve its total yield, it is preferable to reduce R to less than FR, and in particular, R / FR is 0.005 (R: FR = 0.05: 9.95) to 0.82 (R: FR = 4.5: 5.5) is preferable. Moreover, the monthly yield and the total yield of strawberries in Example 2 and Comparative Example 6 from December to March were as shown in FIG. The yield of strawberries according to Comparative Example 6 was less than that of Example 2 in any month. This result has shown that the illuminating device 1 promotes the growth of a strawberry.

As described above, according to the lighting device 1 of the present embodiment, the light including the red light component is irradiated to the plant P in the time zone sandwiching the sunset, and then the light including the far red light component is irradiated. Is done. Thereby, compared with the case where the sunlight which mixed a red light component and a far red light component is irradiated, since the conversion from Pr type | mold phytochrome to Pfr type phytochrome in plant P can be sharpened, plant P Growth is promoted. Therefore, the cultivation cycle of the plant P can be shortened or the yield of the plant P can be increased.

Further, by reducing R1 to less than R2 and R to less than FR (preferably, R / FR = 0.005 to 0.82), it is possible to further change from Pr-type phytochrome to Pfr-type phytochrome. The conversion can be sharpened. Thereby, the growth of the plant P can be further promoted.

The lighting device 1 may be installed in a completely closed plant production factory where sunlight does not reach. In this case, the 1st light source 2 and the 2nd light source 3 are on / off-controlled on the basis of the light / dark period schedule of the artificial light source used for the growth of the plant P, for example. Moreover, although the illuminating device 1 can be used over the whole year, it is especially effective in the short day period from autumn to early spring when sunlight decreases.

In addition, the plant growth lighting device according to the present invention is not limited to the above embodiment, and various modifications are possible. For example, the first light source and the second light source may be realized by controlling the wavelength of light emitted from one type of light source. This can be realized, for example, by using an incandescent lamp that emits visible light of any wavelength as a light source, and appropriately combining the incandescent lamp with a red light filter or a far red light filter.

Claims

A plant growing lighting device equipped with a light source for irradiating light to a plant,
A first light source that emits light including a red light component in a wavelength range of 610 to 680 nm;
A second light source that emits light including a far-red light component in the wavelength range of 685 to 780 nm;
A control unit for controlling the irradiation operation of the first light source and the second light source;
A time setting unit for setting a time zone for irradiating the first light source and the second light source to the control unit, and
The time setting unit irradiates the first light source with an irradiance of 0.005 W / m 2 or more and a daily integrated irradiance of 0.015 kJ / m 2 or more in a time zone sandwiching sunset, and thereafter The second light source is set to irradiate with a daily irradiance of 0.02 W / m 2 or more and a daily integrated irradiance of 0.21 kJ / m 2 or more in the time period until sunrise. A plant-growing lighting device characterized by comprising:
The integrated irradiance of light irradiated by the first light source in the time zone before sunset is controlled to be less than the integrated irradiance of light irradiated by the first light source in the time zone after sunset. The plant growing lighting device according to claim 1, wherein
3. The integrated irradiance of light irradiated by the first light source is controlled so as to be less than the integrated irradiance of light irradiated by the second light source. The plant cultivation lighting device described in 1.
The ratio of the cumulative irradiance of light irradiated by the first light source to the cumulative irradiance of light irradiated by the second light source is 0.05: 9.95 to 4.5: 5.5. The plant growing lighting device according to claim 3, wherein the plant growing lighting device is controlled.