JP6233623B2 - Light control device for plant growth, light control method, light control program, and data collection device for light control - Google Patents

Description

  The present invention relates to a light control device, a light control method, and a light control program for controlling light necessary for plant growth, and in particular, forms a light form suitable for a plant to be grown and irradiates the plant. The present invention relates to a light control device that can perform the light control, a light control method, a light control program used in this method, and a data collection device for light control.

For example, in the production site of plants, in order to adjust the formation time of flower buds of short-day plants and long-day plants, it is performed to adjust the time of light irradiating the plants and the spectral radiant intensity (for example, (See Patent Documents 1 and 2).
By the way, in the relationship between light and plants, “red light / far-red light” relates to “morphogenesis, germination, pigment synthesis, germination induction, germination inhibition, growth regulation, stem elongation, leaf area expansion”, etc. It is known to do. Also, “blue light” means “morphogenesis such as stem elongation, leaf emergence speed, leaf thickness, phototropism, stomatal opening, chloroplast movement, flower bud formation such as flowering, synchronization of the day rhythm, It is known to be related to “dye synthesis”.

LEDs are easy to create illumination light of all colors by combining RGB (red, green and blue) emission colors, and are superior to other lighting devices in terms of low power consumption and low heat generation. There is also a proposal to increase the plant productivity in a plant factory or the like by adjusting the spectral radiation intensity (light intensity for each frequency).
For example, in the growing method described in Patent Document 2, two types of LEDs, red and blue, are arranged adjacent to each other, and the red and blue LEDs are caused to emit light alternately or simultaneously at a predetermined timing. In addition to plant photosynthesis, it is trying to promote photomorphogenesis.

JP 2012-39901 A JP 2009-125007 A

However, it is preferable to irradiate with natural light as much as possible in order to further reduce power consumption to reduce the cost of plant production or to produce a plant that is closer to nature. In addition, the light form suitable for plant growth differs depending on the type of plant and the growth process, and it is difficult to sufficiently grow plants with a fixed light form as in Patent Documents 1 and 2. In particular, when an illumination device such as an LED is used in combination with external light that changes depending on the weather, time, and season, such as natural light, the prior art described in Patent Documents 1 and 2 has a light form corresponding to the change. It is difficult to irradiate with. In addition, there is a problem that wasteful energy is consumed when natural light is sufficiently irradiated. Furthermore, if light with a higher spectral radiant intensity than necessary is irradiated, the leaves may shrink or die, which may lead to growth inhibition and a reduction in commercial value.
The present invention has been made in view of the above problems, and can be used in combination with external light that changes like natural light, can cope with the type of plant and the process of growth, and is suitable for growing conditions. Can be adjusted in accordance with the change of the external light and can control light without waste, a light control method, a light control program for the light control method, and data collection for light control The purpose is to provide a device.

In order to achieve the above object, the invention according to claim 1 is a light control device for growing a plant that promotes the growth of the plant by irradiating the plant with light. Photodetector for detecting spectral radiation intensity, spectral radiation intensity determined for each plant by the photodetector, action spectral sensitivity for photosynthesis for each plant, action spectral sensitivity of phytochrome and action spectral sensitivity of cryptochrome From the relationship, the light model creation unit that creates the light control model, the storage unit that stores the light control model created by the light model creation unit and a predetermined value, and the light detection unit A control unit that obtains a shortage of spectral radiant intensity from the result obtained using the light control model based on the spectral radiant intensity and the value, and a command signal from the control unit. And a light supplementing unit for supplementing the insufficient spectral radiation intensity, and detecting the spectral radiation intensity of light irradiated to the plant after supplementation by the light detection unit, and detecting the detected result It is configured to feed back to the control unit.

Specifically, as described in claim 2 , the light control model uses spectral radiant intensity, action spectral sensitivity related to photosynthesis, action spectral sensitivity of phytochrome, and action spectral feeling of cryptochrome.
(PPE: photosynthesis / photomorphogenesis effect, λ: wavelength, φ (λ): spectral radiation intensity (W / m ² ), P (λ): action spectral sensitivity of photosynthesis, Pr (λ): action of phytochrome Pr type Spectral Sensitivity, Pfr (λ): Action Spectral Sensitivity of Phytochrome Pfr Type, Cry (λ): Action Spectral Sensitivity of Cryptochrome, a, b, b ₁ , b ₂ , c: Coefficient, α1-α2: Effective Photosynthesis Sensitivity Β1-β2: effective sensitivity wavelength region of phytochrome Pr type, β3-β4: effective sensitivity wavelength region of phytochrome Pfr type, and γ1-γ2: effective sensitivity wavelength region of cryptochrome). Good.

In this case, as described in claim 3 , in the term of action spectral sensitivity of cryptochrome of formula (1), it is applied to the following formula (2) according to the ratio of red light to blue light,
(B3: coefficient, δ1-δ2: wavelength region of blue light, δ3-δ4: wavelength region of red light)
The coefficient c may be switched between BR ≧ 0 and BR <0.

According to the light control method of the present invention, as described in claim 4 , in the light control method for plant growth that promotes the growth of the plant by irradiating the plant with light, the light irradiating the plant A light control model based on the relationship between the step of detecting the spectral radiant intensity, the spectral radiant intensity detected for each plant, the action spectral sensitivity for photosynthesis for each plant, the action spectral sensitivity of phytochrome, and the action spectral sensitivity of cryptochrome. and creating the steps of: storing the said light control model and a predetermined value in the storage unit, shortage of the spectral radiation from said light control model with the read detected the spectral radiant intensity from the storage unit A step of obtaining an intensity; a step of outputting a command to supplement the insufficient spectral radiation intensity; and a spectral radiation intensity of light irradiated on the plant after the supplementary light. And, a step of feeding back the result detected to determining the spectral radiant intensity of the shortage.

As described in claim 5 , the spectral radiation intensity, the action spectral sensitivity related to photosynthesis, the action spectral sensitivity of phytochrome, and the action spectral sensitivity of cryptochrome in the light control model are expressed by the following equations: Also good.
(PPE: photosynthesis / photomorphogenesis effect, λ: wavelength, φ (λ): spectral radiation intensity (W / m ² ), P (λ): action spectral sensitivity of photosynthesis, Pr (λ): action of phytochrome Pr type Spectral Sensitivity, Pfr (λ): Action Spectral Sensitivity of Phytochrome Pfr Type, Cry (λ): Action Spectral Sensitivity of Cryptochrome, a, b, b ₁ , b ₂ , c: Coefficient, α1-α2: Effective Photosynthesis Sensitivity Wavelength region, β1 to β2: effective sensitivity wavelength region of phytochrome Pr type, β3 to β4: effective sensitivity wavelength region of phytochrome Pfr type, and γ1 to γ2: effective sensitivity wavelength region of cryptochrome).

In this case, as described in claim 6 , in the term of action spectral sensitivity of cryptochrome of formula (1), the following formula (2) is applied depending on the ratio of red light and blue light:
(B3: coefficient, δ1-δ2: wavelength region of blue light, δ3-δ4: wavelength region of red light)
The coefficient c may be switched between BR ≧ 0 and BR <0.
According to the light control method described above, the spectral radiant intensity obtained for each plant, the action spectral sensitivity related to the photosynthesis for each plant, the action spectral sensitivity of phytochrome, and the action of cryptochrome as described in claim 7 Creating a light control model from the relationship with spectral sensitivity,
Storing the light control model and a predetermined value in a storage unit; obtaining a shortage of spectral radiation intensity from the spectral radiation intensity obtained for each plant and the light control model read from the storage unit; A step of outputting a command to supplement the insufficient spectral radiant intensity, and a step of feeding back the spectral radiant intensity of light irradiated to the plant detected after the supplemental light to the step of obtaining the insufficient spectral radiant intensity. It can be executed by a light control program for plant growth for executing each of the steps .
Further, the data collection device for light control includes, as described in claim 8 , a light detection unit that detects a spectral radiation intensity of light irradiated on a plant, and a spectral radiation intensity detected by the light detection unit. A light model creation unit that creates a light control model from the relationship between the action spectral sensitivity related to photosynthesis for each plant, the action spectral sensitivity of phytochrome, and the action spectral sensitivity of cryptochrome; and a storage unit that stores the created light control model It can be set as the structure which has these.

According to the present invention, it is possible to reduce the power consumption of an illuminating device such as an LED as much as possible by using external light that changes like natural light and an illuminating device such as an LED as much as possible. It is possible to suppress wasteful power consumption when it is sufficiently irradiated. In addition, it is possible to grow plants in a natural environment by irradiation with natural light, and to adjust the light form according to the growth conditions such as plant type and growth process according to changes in external light. It is possible to stably produce high-quality plants while adjusting the harvest time, harvest amount, and number of harvests.
In addition, the data collection device of the present invention is installed on, for example, a farm with a large amount of harvest or a plant that produces plants with excellent taste, and a light control model is created, thereby constructing a database consisting of a light control model with a high profit rate. can do.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG.1 and FIG.2 is based on an example of the cultivation apparatus provided with the light supplement device which supplements light by the light control apparatus of this invention, FIG. 3 is the schematic explaining the structure, FIG. 3 is the light control apparatus of this invention. It is a block diagram explaining the structure concerning one Embodiment.
The cultivation apparatus 10 for cultivating a plant in this embodiment has the same configuration as the cultivation apparatus used for general hydroponics, and, as shown in FIG. 1, a large number of cultivation holes for planting plants. The planting part 101 provided with 101a, and the storage container 102 which stores the culture solution supplied to the plant planted in this planting part 101, and accommodates the planting part 101 in a culture solution in a floating state ing.

The plant cultivated by the cultivation apparatus 10 is irradiated with external light such as natural light, but the external light changes depending on the weather and season, and the light of the wavelength component suitable for the growth of the plant is only natural light. May not get enough.
So, in this embodiment, while providing the light detector 11 which detects the light irradiated to a plant in the cultivation apparatus 10, the supplement light which supplements a required quantity of light based on the detection result of this light detector 11 And a container 12.

The light supplement device 12 includes a pair of arms 122 attached to the liquid storage container 102 and a frame 121 supported by the arms 122, and a number of LEDs 120 that are light emitters are attached to the frame 121. The arm 122 is pivotally attached to the side surface of the liquid storage container 102 by a pivot 123, and a positioning bolt is inserted into a partial arc-shaped groove 125 formed on the side surface of the liquid storage container 102 and tightened. Can be positioned at any angular position.
The cultivation apparatus 10 of the form as shown in FIG. 1 is capable of mass production of plants in a plant factory by arranging a large number of cultivation apparatuses 10 on a shelf, and since it is small and light by itself, It can also be suitably used for in-store vegetable gardens in restaurants.
FIG. 2 is a schematic view showing an example of a shelf-like cultivation device suitable for use in a relatively large-scale facility such as a plant factory according to another example of the cultivation device.
The cultivation apparatus 20 stores a shelf-like planting unit 201 having a large number of cultivation holes 201a for planting a plant and a culture solution supplied to the plant planted in the planting unit 201, and the planting unit 201 is stored in the planting unit 201. A liquid storage container 202 that is stored in a suspended state in the culture solution. The light detector 21 is disposed at an appropriate position in the planting unit 201.
The light supplement device 22 includes a shelf-like frame 221 disposed in parallel with the planting unit 201 above the planting unit 201, and an LED 220 attached to the frame 221.
A large number of plants can be cultivated by arranging a plurality of the cultivating apparatus 20 and the light supplement device 22 in the above configuration in the vertical direction as shown by phantom lines in FIG. .

As shown in FIG. 3, in order to always automatically irradiate light of a suitable form with respect to the plants planted in the cultivation devices 10 and 20, the light control devices 1 and 2 of this embodiment are photodetectors. Based on the control unit 13 that calculates the spectral radiant intensity of the shortage from the detection results of 11 and 21, the model storage unit 14 that gives a light control model for each plant to the control unit 13, the measurement data for each plant, and the like And a model creation unit 15 for creating a light control model and storing it in the model storage unit 14.
As the control unit 13, model storage unit 14, and model creation unit 15, a commercially available personal computer (PC) installed with a model creation application can be used.

[Photodetector]
The photodetectors 11 and 21 detect the spectral radiant intensity of the light irradiated on the plant. A commercially available product can be used as long as it can detect the spectral radiant intensity of light. Spectral radiation intensity can be detected by spectroscopy through a spectroscope, using multiple filters that transmit light in a certain wavelength range to obtain spectral radiation intensity for each wavelength range, or detecting light of a certain wavelength. A detection element is known.
The photodetectors 11 and 21 are arranged at the center or the peripheral portion of the planting unit 101 so that the light irradiated on the plant can be accurately detected. Although the number of photodetectors 11 and 21 may be one, it is preferable to provide a plurality of photodetectors with different arrangement positions.

[Auxiliary light device]
In this embodiment, the light supplementers 12 and 22 are configured by combining a plurality of types of illumination bodies having different wavelengths. It is preferable that the illuminator is an LED that can easily adjust the light intensity, consumes less power, and generates less heat. As described above, “red light / far-red light” acts on “morphogenesis such as germination induction, germination inhibition, growth regulation, stem elongation / leaf area expansion, germination formation, pigment synthesis”, and “blue” Acting on morphogenesis such as stem elongation, leaf emergence speed and leaf thickness, phototropism, stomatal opening, chloroplast movement, flower bud formation such as flowering, synchronism of day rhythm, pigment synthesis Thus, the light supplement device 12 preferably includes at least red and blue LEDs. A green LED may be further provided, and the provision of the three primary colors of RGB makes it possible to expand the range of spectral radiation that can be supplemented.

[Control unit and light control model]
4A to 4D show a white fluorescent lamp (illuminance 100), a green fluorescent lamp (illuminance 100, 150, 200), a red LED (illuminance 100, 200, 250, 300, 400, 600) as light sources, It is a graph which shows the relationship between the cultivation days in a lettuce and dry weight at the time of using blue LED (illuminance 100), red / blue LED (illuminance: red 50 + blue 50, red 500 + blue 500), green LED (illuminance 200). is there. 4A to 4D, the vertical axis represents the dry weight (g), and the horizontal axis represents the elapsed days. In order to create a light control model, various light sources having different wavelengths are prepared and data similar to those shown in FIGS.
As a method for measuring the relationship between plant growth and light using such data, PPFD (photosynthetic effective photon flux density: μmol m ⁻² · s ⁻¹ ) is used as a photometric quantity for plant growth. It has been known. PPFD is expressed by the following equation.
Here, h: blank constant, c: speed of light, φ (λ): spectral radiation intensity (W / m ² ), λ: wavelength of light.
FIG. 5A is a graph showing the relationship between relative dry weight (ratio of dry weight with white fluorescent lamp (FL (white)) being 1) and PPFD. The regression line equation of this graph based on the data obtained by the measurement as shown in FIG. 4 is represented by Y = 0.0001X + 0.242. As shown in the figure, since the variation of data is large with respect to this regression line equation (determination coefficient R ² = 0.5458), PPFD is not suitable as a light control model.

FIG. 6 shows the relationship between absorbance and wavelength in the case of lettuce.
In the example of FIG. 6, the effect of photosynthesis is expressed by the relationship between the spectral radiation intensity φ (λ) (W / m ² ) and the photosynthesis action distribution photosensitivity P (λ) in a wavelength range of approximately 400 nm to 700 nm. Is done.
The action by phytochrome is generally in the wavelength range of 300 nm to 800 nm, and the relational expression between the spectral radiant intensity φ (λ) (W / m ² ) and the phytochrome Pr type action spectral sensitivity Pr (λ) and the spectral radiant intensity φ ( (λ) (W / m ² ) and the phytochrome Pfr type action spectral sensitivity Pfr (λ).
The action of cryptochrome is generally represented by the relationship between the spectral radiation intensity φ (λ) (W / m ² ) and the action spectral sensitivity Crv (λ) of cryptochrome within a wavelength range of 300 nm to 800 nm.
Based on the above relationship, the inventor of the present application quantified the contribution of the irradiated light to the dry weight using the spectral radiation intensity, the action spectral sensitivity related to photosynthesis, and the action spectral sensitivity of phytochrome and cryptochrome (phototropin). The following formula (1) was devised.

Here, PPE is a photosynthesis / photomorphic effect (Photosynthetic
and Photomorphogenesis Effect [W / m ² ]), and the spectral radiant intensity φ (λ) in the formula is substituted with the detection result from the photodetector 11, and the spectral sensitivities P (λ), Pr (λ), As Pfr (λ) and Crv (λ), those obtained by measurement or the like for each plant are used.
Α1 and α2 are the upper and lower limits of the range in which the effect of photosynthesis is obtained. In the example of FIG. 6, α1 = 400 nm, α2 = 700 nm, and β1 and β2 are the upper and lower limits of the range in which the action of phytochrome Pr type occurs. Β1 = 300 nm, β2 = 800 nm, β3, β4 are the upper and lower limits of the range where the action of phytochrome Pfr type occurs, and β3 = 300 nm, β4 = 800 nm, γ1, γ2 are the upper limits of the range where action of cryptochrome occurs At the lower limit, γ1 = 300 nm and γ2 = 800 nm.
The coefficients a, b, b1, b2, c are determined for each plant. In the case of lettuce, a = 0.8 to 1.2, b = 0.6 to 1.0, b1 = 0.2 to 0.35, b2 = 0.65 to 0.8, the coefficient c is determined by the ratio of blue light and red light, and the following formula
When the left side BR of (coefficient b3 = 0.1) is BR ≧ 0, coefficient c = 0.25, and when BR <0, coefficient c = 1.25.
σ1 and σ2 are wavelength ranges of blue light, σ1 = 300 nm, σ2 = 500 nm, σ3 and σ4 are wavelength ranges of red light, σ1 = 500 nm, and σ2 = 800 nm.
FIG. 5B is a graph showing the relationship between relative dry weight (ratio of dry weight with white fluorescent lamp (FL (white)) being 1 as in FIG. 5A) and PPE. The regression line equation of this graph is represented by Y = 0.0979X-0.0974, and the coefficient of determination R ² = 0.8942 for the regression line equation is obtained. By using PPE, the data distribution is on the regression line equation. Converge as much as possible. In the light control apparatus and method of the present invention, this PPE is used as a light control model.

As described above, the light control model used in the light control apparatus and method of the present invention has the data obtained by the measurement as shown in FIG. 4 for each type of plant, as shown in FIG. It is obtained by obtaining each coefficient (including the sign +-) of the PPE expression by the model creation unit 15 such as a personal computer so that it converges as much as possible on one regression line. Then, the obtained light control model is classified for each plant and stored in the model storage unit 14.
The control unit 13 reads out a light control model corresponding to the plant to be cultivated from the model storage unit 14, and uses each of the spectral radiant intensity (light intensity for each frequency) input from the photodetector 11 as the light control model. substitute. And the control part 13 calculates | requires the spectral radiant intensity of deficiency so that PPE may be previously calculated | required by experiment etc. for every plant, and may become a value (henceforth appropriate value) suitable for cultivation of a plant.
The insufficient spectral radiant intensity obtained in this way is transmitted to the optical compensator 12, and the spectral radiant intensity of the light emitted from the optical compensator 12 is adjusted according to the insufficient spectral radiant intensity.

FIG. 7 is a flowchart for explaining the operation of the light control device 1 having the above-described configuration.
With the activation of the light control device (step S1), the spectral radiation intensity is detected by the photodetector 11 (step S2).
The detection result is transmitted to the control unit 13 and substituted into the light control model read from the model storage unit 14 (step S3).
The control unit 13 compares the appropriate value of PPE with the calculation result of the light control model (step S4), and obtains the insufficient spectral radiation intensity (step S5). Then, a light supplement command is output from the control unit 13 to the light supplement device 12 (step S6). As a result, the illuminance of the light supplement device 12 changes, but the result of light compensation is detected by the light detector (step S1), and thereafter, the operations of steps S2 to S6 are repeated until the light control is completed (step S7). Each of these steps is performed by executing a program installed in a processing device such as a personal computer and stored in a memory.
By the above procedure, the plant planted in the cultivation apparatus 10 is always irradiated with light in a suitable form.

[Data collection device]
Of the light control device 1 described above, a predetermined plant growth and the plant were irradiated by the photodetector 11 (21), the control unit 13, the model creation unit 15, and the model storage unit 14. It is possible to configure a data collection device that collects data related to spectral radiation intensity and creates a light control model.
By installing this data collection device on a farm, for example, by continuously measuring the spectral radiant intensity of the light irradiated on the plant during the period from sowing to harvesting, the growth of the plant and the spectrum irradiated on the plant are measured. Collect data showing the relationship with radiation intensity. Then, based on the obtained data, the model creation unit 15 creates a light control model. The created light control model is stored in the model storage unit 14. By performing such measurement and model creation on a farm with a large yield and a farm producing a plant with excellent taste, a database composed of a light control model with a high profit rate can be constructed.

Although a preferred embodiment of the present invention has been described, the present invention is not limited to the above description.
For example, the cultivation apparatus to which the present invention is applied is not limited to the one shown in FIGS. 1 and 2, and may be, for example, a round table-like one or a water tank-like one.
Moreover, although the light emitter has been described as an LED, other light emitters such as a fluorescent lamp and an incandescent lamp can be used as long as the spectral radiation intensity can be adjusted. Many of these light emitters themselves do not have red or blue light emission colors, so that red or blue light emitters are obtained by filtering or coloring.

It is the schematic concerning an example of the cultivation apparatus provided with the light supplement device which supplements light with the light control apparatus of this invention, and demonstrates the structure. It is the schematic concerning the other example of the cultivation apparatus provided with the light supplement device which supplements light with the light control apparatus of this invention, and demonstrates the structure. 1 is a block diagram illustrating a configuration of a light control apparatus according to an embodiment of the present invention. Cultivation in lettuce when using white fluorescent lamp (illuminance 100), green fluorescent lamp (illuminance 100), red LED (illuminance 100), red / blue LED (illuminance 50 + 50), blue LED (illuminance 100) as light source It is a graph which shows the example of a measurement of days and dry weight, and shows the relationship. Cultivation days and dry weight in lettuce when white fluorescent lamp (illuminance 100), green fluorescent lamp (illuminance 200), red LED (illuminance 200), red LED (illuminance 400), red LED (illuminance 600) are used as the light source. It is a graph which shows the measurement example and shows the relationship. Cultivation in lettuce when using white fluorescent lamp (illuminance 100), green fluorescent lamp (illuminance 150), red LED (illuminance 300), red LED (illuminance 500), red / blue LED (illuminance 500 + 100) as the light source It is a graph which shows the example of a measurement of days and dry weight, and shows the relationship. Cultivation days and dry weight in lettuce when using white fluorescent lamp (illuminance 100), green fluorescent lamp (illuminance 200), red LED (illuminance 200), red LED (illuminance 250), green LED (illuminance 200) as the light source It is a graph which shows the measurement example and shows the relationship. It is a graph which shows the relationship between relative dry weight and PPFD. It is a graph which shows the relationship between relative dry weight and PPF. It is a graph which shows the relationship between the light absorbency and wavelength in the case of lettuce. It is a flowchart explaining the effect | action of the light control apparatus of this invention.

DESCRIPTION OF SYMBOLS 1, 2 Light control apparatus 10, 20 Cultivation apparatus 11, 21 Photo detector 12, 22 Light supplement device 13 Control part 14 Model memory | storage part 15 Model preparation part

Claims (8)

In the light control device for plant growth that promotes the growth of the plant by irradiating the plant with light,
A light detection unit for detecting a spectral radiant intensity of light irradiated on the plant;
The light control model is created from the relationship between the spectral radiant intensity detected for each plant by the photodetector and the action spectral sensitivity for photosynthesis for each plant, the action spectral sensitivity of phytochrome, and the action spectral sensitivity of cryptochrome. A light model creation unit;
A storage unit for storing the light control model and predetermined value created by the optical modeling unit,
A control unit for obtaining a deficient spectral radiation intensity from the value obtained using the light control model based on the spectral radiation intensity detected by the light detection unit and the value;
Based on the command signal from this control unit, an auxiliary light unit that supplements the insufficient spectral radiation intensity,
Have
Detecting the spectral radiant intensity of light irradiated on the plant after supplementary light by the light detection unit, and feeding back the detected result to the control unit;
A light control device for growing plants. The light control model, the spectral radiation intensity, the working spectral sensitivity for photosynthesis, a working spectral sensitivity of the phytochrome, to claim 1, characterized by being represented by the following equation using the action spectral sensitivity of cryptochrome The light control apparatus for plant growth as described.

(PPE: photosynthesis / photomorphogenesis effect, λ: wavelength, φ (λ): spectral radiation intensity (W / m ² ), P (λ): action spectral sensitivity of photosynthesis, Pr (λ): action of phytochrome Pr type Spectral Sensitivity, Pfr (λ): Action Spectral Sensitivity of Phytochrome Pfr Type, Cry (λ): Action Spectral Sensitivity of Cryptochrome, a, b, b ₁ , b ₂ , c: Coefficient, α1-α2: Effective Photosynthesis Sensitivity (Wavelength region, β1-β2: effective sensitivity wavelength region of phytochrome Pr type, β3-β4: effective sensitivity wavelength region of phytochrome Pfr type, γ1-γ2: effective sensitivity wavelength region of cryptochrome) In the term of action spectral sensitivity of cryptochrome of formula (1) in the light control device for plant growth according to claim 2 , the following formula (2) is applied according to the ratio of red light and blue light:
(B3: coefficient, δ1-δ2: wavelength region of blue light, δ3-δ4: wavelength region of red light)
Light control device for growing a plant and also changes a coefficient c at the time of the BR <0 when BR ≧ 0. In the light control method for plant growth that promotes the growth of the plant by irradiating the plant with light,
Detecting a spectral radiant intensity of light irradiated on the plant;
Creating a light control model from the relationship between the spectral radiant intensity detected for each plant and the action spectral sensitivity for photosynthesis for each plant, the action spectral sensitivity of phytochrome and the action spectral sensitivity of cryptochrome ;
Storing the light control model and a predetermined value in a storage unit;
Determining a spectral radiant intensity of the shortage from the detected the spectral radiation intensity and the light control model read from the storage unit,
Outputting a command to supplement the insufficient spectral radiation intensity;
Detecting the spectral radiant intensity of light irradiated to the plant after supplemental light, and feeding back the detected result to the step of obtaining the insufficient spectral radiant intensity ;
A light control method for growing plants characterized by comprising: 5. The light control method for plant growth according to claim 4 , wherein a portion including the action spectral sensitivity related to photosynthesis of the light control model, the action spectral sensitivity of phytochrome, and the action spectral sensitivity of cryptochrome is represented by the following formula: A light control method for plant growth characterized by being represented.
(PPE: photosynthesis / photomorphogenesis effect, λ: wavelength, φ (λ): spectral radiation intensity (W / m ² ), P (λ): action spectral sensitivity of photosynthesis, Pr (λ): action of phytochrome Pr type Spectral Sensitivity, Pfr (λ): Action Spectral Sensitivity of Phytochrome Pfr Type, Cry (λ): Action Spectral Sensitivity of Cryptochrome, a, b, b ₁ , b ₂ , c: Coefficient, α1-α2: Effective Photosynthesis Sensitivity (Wavelength region, β1-β2: effective sensitivity wavelength region of phytochrome Pr type, β3-β4: effective sensitivity wavelength region of phytochrome Pfr type, γ1-γ2: effective sensitivity wavelength region of cryptochrome) In terms of the action spectral sensitivity of cryptochrome of formula (1), the following formula (2) is applied according to the ratio of red light and blue light:
(B3: coefficient, δ1-δ2: wavelength region of blue light, δ3-δ4: wavelength region of red light)
The light control method for plant growth according to claim 5 , wherein the coefficient c is switched between BR ≧ 0 and BR <0. On the computer,
Creating a light control model from the relationship between the spectral radiant intensity determined for each plant and the action spectral sensitivity for photosynthesis for each plant, the action spectral sensitivity of phytochrome and the action spectral sensitivity of cryptochrome;
Storing the light control model and a predetermined value in a storage unit;
A step of obtaining a shortage of spectral radiant intensity from the spectral radiant intensity determined for each plant and the light control model read from the storage unit;
Outputting a command to supplement the insufficient spectral radiant intensity;
Feeding back the spectral radiant intensity of light radiated to the plant detected after supplemental light to the step of determining the spectral radiant intensity of the shortage,
Light control program for plant growth to execute each step . It is a data collection device for creating the light control model used for the light control method for plant growth according to any one of claims 4-6 , and detects the spectral radiation intensity of the light irradiated to a plant Create a light model that creates a light control model based on the relationship between the light detection unit and the spectral radiant intensity detected by this light detection unit, the action spectral sensitivity related to photosynthesis for each plant, the action spectral sensitivity of phytochrome, and the action spectral sensitivity of cryptochrome And a storage unit for storing the created light control model. A data collection device for light control, characterized by comprising: