JP2015223101A - Plant state determination device, plant state determination method and plant state determination program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant state determination device which can measure the growth state of plant leaves at low costs.SOLUTION: A plant state determination device according to one embodiment of the present invention comprises: light intensity detection means that detects the intensity of light incoming from a cultivation bed in which a plant is grown, using an illuminance sensor; and determination means that determines the state of the growth of the plant on the basis of detection intensity that is the detected intensity of light, and reference intensity that is the intensity of light detected in a state where the plant is not present.

Description

  The present invention relates to a technique for determining the state of a plant.

  The growth state of crops and other plants is determined by, for example, the leaf area and stem diameter of the plant. As a method for determining the growth state of a plant, there is a method of measuring the leaf area and stem diameter of a plant using a ruler by hand. However, the measurement results vary greatly depending on the skill of the worker and the measurement environment. Furthermore, in an environment where the cultivation area is large, an environment where multi-stage cultivation is performed, etc., manual measurement is inefficient and requires high costs. Examples of techniques for determining the growth state of a plant without depending on human hands are described in Patent Documents 1, 2, 3, and 4, for example.

  The crop growth evaluation system described in Patent Document 1 estimates the plant height by processing a plant image acquired using a camera. The crop growth evaluation system determines the growth state of the plant based on the estimated plant height.

  The plant growing apparatus described in Patent Document 2 measures the height of a plant using line sensors installed at a plurality of height positions. The plant growing device determines the growth state of the plant based on the measured plant height.

  The growth degree measuring apparatus of patent document 3 estimates the growth degree showing the growth state of a plant using the reflectance of sunlight divided into a plurality of wavelengths.

  The growth degree measuring apparatus of patent document 4 measures the growth degree showing the growth state of a plant using the reflectance of the reflected light with respect to irradiation light in several wavelengths.

Patent No. 4009441 JP 2012-254058 A JP 2002-168771 A JP 2008-076346 A

  The plant height of a plant does not always accurately represent the growth state of the plant. For example, in an environment where sunlight is insufficient, plant leaves do not grow sufficiently. However, the plant height of plants grown in a sunshine-deficient environment may be higher compared to similar plants that grow in a sufficiently sunshine environment.

  In the techniques of Patent Documents 1 and 2, even if the leaves of a plant are not sufficiently grown, it is determined that the growth state of the plant is good if the plant height is high. Therefore, the techniques of Patent Documents 1 and 2 cannot estimate the leaf growth state of plants.

  In the techniques of Patent Documents 3 and 4, a spectroscopic sensor is required. Therefore, the techniques of Patent Documents 3 and 4 require high costs.

  One of the objects of the present invention is to provide a plant state determination device or the like that can measure the growth state of a plant leaf at a low cost.

  The plant state determination apparatus according to an aspect of the present invention includes a light intensity detection unit that detects, using an illuminance sensor, the intensity of light incident from a cultivation bed on which a plant is grown, and detection that is the detected intensity of the light. Determination means for determining the state of growth of the plant based on the intensity and a reference intensity that is the intensity of the light detected in the absence of the plant.

  In the plant state determination method according to one aspect of the present invention, the intensity of light incident from the cultivation bed on which the plant is grown is detected by an illuminance sensor, and the detected intensity that is the detected light intensity and the plant The state of growth of the plant is determined based on a reference intensity that is the intensity of the light detected in the absence of light.

  The plant state determination program according to an aspect of the present invention includes a light intensity detection unit that detects, by an illuminance sensor, the intensity of light incident from a cultivation bed on which a plant is grown, and the detected intensity of the light. And a determination means for determining the growth state of the plant based on the detected intensity and the reference intensity that is the intensity of the light detected in the absence of the plant.

  The present invention has an effect that the growth state of a plant leaf can be measured at low cost.

FIG. 1 is a diagram schematically showing an overall image of the plant cultivation system 100 according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating an example of a configuration of the plant state determination device 1 according to the first embodiment. FIG. 3 is a diagram illustrating a first example of the shape of the reflector 21 according to the first and second embodiments of the present invention. FIG. 4 is a diagram illustrating a second example of the shape of the reflector 21 according to the first and second embodiments of the present invention. FIG. 5 is a diagram illustrating a third example of the shape of the reflector 21 according to the first and second embodiments of the present invention. FIG. 6 is a diagram illustrating a fourth example of the shape of the reflector 21 according to the first and second embodiments of the present invention. FIG. 7 is a flowchart showing the operation of the plant state determination apparatus 1 according to the first embodiment when the growth state of the plant 30 is determined. FIG. 8 is a diagram schematically showing a change in the intensity of the detected light accompanying the growth of the plant 30. FIG. 9 is a diagram schematically illustrating an overall image of a plant cultivation system 100A according to the second embodiment of the present invention. FIG. 10 is a block diagram showing a configuration of a plant state determination apparatus 1A according to the third embodiment of the present invention. FIG. 11 is a diagram illustrating an example of a hardware configuration of a computer 1000 that can realize the plant state determination device 1 and the plant state determination device 1A.

  Embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram schematically showing an overall image of the plant cultivation system 100 according to the first embodiment of the present invention.

  Referring to FIG. 1, a plant cultivation system 100 according to this embodiment includes a plant state determination device 1, a cultivation bed 20, a reflector 21, an illuminance sensor 22, and a light source 28.

  The cultivation bed 20 is a device for growing the plant 30. A plant 30 is planted and cultivated on the upper surface of the cultivation bed 20, for example, the upper surface. The cultivation bed 20 supplies nutrient solution or the like to the plant 30 that has roots inside the cultivation bed 20. The trunks, branches, and leaves of the plant 30 extend from the upper surface of the cultivation bed 20. The cultivation bed 20 includes a portion for cultivating the plant 30 on the upper surface. In the example shown in FIG. 1, the cultivation bed 20 is a container for growing the plant 30 by hydroponics. The plant 30 is planted in a hole formed in the upper surface of the cultivation bed 20. At least the portion of the upper surface of the cultivation bed 20 where the reflector 21 described later is installed may be, for example, a flat surface or a substantially flat surface. The cultivation bed 20 may be a container in which soil or the like in which plants are planted is placed. The plant 30 may be planted in soil or the like placed in the cultivation bed 20.

  The plant 30 may be one (that is, one) plant 30 or a plant community composed of a plurality of plants 30. As will be described later, the plant 30 is irradiated with light from the light source 28. In this embodiment, the plant 30 grown at once is the same type of plant 30.

  The reflector 21 is realized by a reflector. This reflecting plate is a flat plate having two parallel or substantially parallel surfaces. These two surfaces are flat or substantially flat. At least one of the two parallel or substantially parallel surfaces of the reflecting plate is a reflecting surface. The reflection surface is configured by a surface having a reflectance higher than that of the plant 30. One reflector 21 may be realized by one or more reflectors.

  The reflector 21 is installed on the cultivation bed 20. The place where the reflector 21 is installed is, for example, around the root of the plant 30. The reflector 21 should just be installed so that the amount of light that does not reach the illuminance sensor 22 by being blocked by the leaves of the plant 30 among the light reflected by the reflector 21 increases as the plant 30 grows. . The surface of the cultivation bed 20 may be the reflector 21. In that case, the cultivation bed 20 should just be made so that the surface in which the plant 30 is planted functions as the reflector 21 at least.

  The light source 28 irradiates the plant 30 from above, for example. The light source 28 is a cultivating light source that can grow the plant 30 by the irradiated light. The light source 28 is, for example, a fluorescent lamp, an LED (Light Emitting Diode), or sunlight.

  The illuminance sensor 22 measures the intensity of light incident from the cultivation bed 20 where the plant 30 is grown. The illuminance sensor 22 only needs to be installed so that light from the light source 28 does not enter directly. For example, when the reflector 21 is installed on the cultivation bed 20 and the plant 30 is grown on the cultivation bed 20, the illuminance sensor 22 reaches the illuminance sensor 22 from the reflector 21, the plant 30, and the cultivation bed 20. Detect the light intensity. For example, when the reflector 21 is installed on the cultivation bed 20 and there is no plant 30 grown on the cultivation bed 20, the illuminance sensor 22 is the intensity of light reaching the illuminance sensor 22 from the reflector 21 and the cultivation bed 20. Is detected. In each embodiment of the present invention, the reflectance of the plant 30 and the reflectance of the surface of the cultivation bed 20 are sufficiently smaller than the reflectance of the reflector 21. In that case, the intensity of the light reaching the illuminance sensor 22 can be regarded as the intensity of the reflected light of the light emitted from the illumination 28 that enters the illuminance sensor 22 via the reflector 21 installed in the cultivation bed 20. A signal representing the light intensity measured by the illuminance sensor 22 is transmitted to the plant state determination apparatus 1. The illuminance sensor 22 and the plant state determination device 1 only need to be connected so that a signal indicating the intensity of light measured by the illuminance sensor 22 can be transmitted from the illuminance sensor 22 to the plant state determination device 1.

  FIG. 2 is a block diagram illustrating an example of a configuration of the plant state determination device 1 of the present embodiment. Referring to FIG. 2, the plant state determination device 1 includes a light intensity detection unit 10, an index estimation unit 11, a determination unit 12, an output unit 13, a growth state storage unit 14, and a processing unit 15.

  The light intensity detection unit 10 detects the intensity of light from the cultivation bed 20 on which the reflector 21 that reflects light is installed and the plant 30 is grown, using the illuminance sensor 22. In the following description, the intensity of light detected by the light intensity detector 10 is referred to as “detection intensity”. Of the detected intensities, the intensity of light detected in the absence of the plant 30 is referred to as “reference intensity”.

  The index estimation unit 11 derives a plant growth index representing the degree of leaf growth of the plant 30 based on the detected intensity, the planting reference intensity, and the area of the reflector 21. The area of the reflector 21 may be, for example, the area of the reflector 21 included in a region of the upper surface of the cultivation bed 20 that is predetermined as a range that affects the illuminance measured by the illuminance sensor 22. The area of the reflector 21 may be, for example, the ratio of the area of the reflector 21 to the area of the upper surface of the cultivation bed 20.

Specifically, the index estimation unit 11 derives the plant growth index AL represented by the expression (2) using, for example, the illuminance ratio ρ represented by the expression (1). In the formula (1), L ₀ represents a detection intensity detected in a state where only the reflector 21 is installed and the plant 30 does not exist. In Formula (1), L represents the detection intensity detected in the state in which the plant 30 is planted. In the formula (1), “/” represents a division operator.

ρ = (1−L / L ₀ ) (1),
A _L = ρ × A _f (2).
In formula (2), A _f represents the area of the reflector 21. In the formula (2), “×” represents a multiplication operator. Value plant growth index A _L that is derived by Equation (2) is by leaves, etc. of plants 30, represents the degree to which the irradiation light to the reflector 21 and the reflected light from the reflector 21 is blocked.

FIG. 8 is a diagram schematically showing a change in the intensity of the detected light accompanying the growth of the plant 30. When the plant 30 grows smoothly, the plant 30 grows with the passage of time. As the plant 30 grows, the leaves of the plant 30 increase. As the number of leaves increases, the light reaching the illuminance sensor 22 from the reflector 21 decreases. Therefore, as shown in FIG. 8, the intensity of light detected by the illuminance sensor 22 decreases with time. In that case, plant growth index A _L defined by equation (1) and (2) increases with the growth of the plant 30.

  The index estimation unit 11 transmits the derived plant growth index to the determination unit 12.

  The growth state storage unit 14 stores a growth model in which a state value representing a state of standard growth (also expressed as growth) is determined by the plant growth index, for example. The state value is, for example, the length of time (that is, the period) that has elapsed since the reference time. The reference time is, for example, the time when the plant 30 is planted. That is, the state value is, for example, the time that has elapsed since the plant 30 was planted.

  The growth model may be, for example, a growth history representing a process in which another plant 30 is grown of the same type as the plant 30 that is grown in the cultivation bed 20 and whose growth state is estimated. In the description of this embodiment, the growth history is obtained when the plant growth index obtained in the process of growing the plant 30 after the plant 30 is planted and the detection intensity from which the plant growth index is derived are detected. A plurality of combinations with the state value of. The plant growth index and the state value may be associated with each other. The plant growth index included in the growth history may be obtained, for example, at predetermined time intervals. In the following description, a plant 30 in which a growth history as a growth model is recorded is referred to as a “standard strain”. Furthermore, a plant 30 that is grown on the cultivation bed 20 and whose growth state is determined by the determination unit 12 described later is referred to as a “target plant”. In this case, the growth state storage unit 14 uses the plant growth index derived based on the detection intensity detected at a predetermined time interval and the time when the detection intensity is detected in the process of growing the standard strain as the growth history. It is only necessary to store a combination with a state value representing.

  The growth state storage unit 14 may store a plurality of growth histories obtained in the process of growing a plant 30 of the same kind as the target plant that has been cultivated prior to the cultivation of the target plant. In this case, the growth model may be, for example, a growth history designated by an administrator of the plant state determination device 1 via an input unit (not shown) of the plant state determination device 1.

  The growth model may be a growth history that is statistically derived from a plurality of growth histories. Such a growth history is described as, for example, “standard growth history” in the following description. In this case, for example, the plurality of growth histories may be obtained by detecting the detection intensity at the same time interval after the plant 30 is planted. And the standard growth history should just contain the combination of the statistical value of the plant growth index | exponent and state value which were mutually linked | related about several different state values. The statistical value of the plant growth index may be a statistical value derived from the plant growth index associated with the state value associated with the statistical value of the plant growth index in a plurality of growth histories. The statistical value is, for example, an average value, an intermediate value, or a median value.

  The growth model may be represented by, for example, a straight line, a curve, or the like derived by applying a least square method or the like to a plurality of growth histories. In the following description, a straight line or a curve representing a growth model is referred to as a “standard growth curve”. The growth model in that case may be a function representing the above-mentioned standard growth curve, for example, whose state value is determined by the plant growth index.

  The growth state storage unit 14 further includes a growth history including a combination of the already derived plant growth index of the target plant and a state value representing the time at which the detection intensity from which the plant growth index was derived was detected. You may remember.

  In that case, the light intensity detection unit 10 detects the detection intensity at a predetermined time interval. And the index estimation part 11 should just derive | lead-out a plant growth index | exponent based on the detected intensity | strength whenever the detection intensity | strength is detected by the light intensity detection part 10. FIG. The index estimation unit 11 stores, as a part of the growth history of the target plant, a combination of the derived plant growth index and the state value representing the time at which the detected intensity from which the plant growth index was derived is detected as a part of the growth history of the target plant. It may be stored in the unit 14.

  The determination unit 12 is the above-described reference, which is the detection intensity that is the above-described light intensity detected in a state where the plant 30 is planted on the cultivation bed 20 and the light intensity that is detected in the absence of the plant 30. Based on the strength, the growth state of the plant 30 is determined. The determination unit 12 may determine the growth state of the plant 30 based on the plant growth index derived by the index estimation unit 11 based on the detected intensity, the planting reference intensity, and the area of the reflector 21. Specifically, for example, the determination unit 12 specifies a state value for the derived plant growth index using a growth model stored in the growth state storage unit 14.

  When the growth model is the growth history of the standard strain, the determination unit 12 may specify a plant growth index that approximates the derived plant growth index in the growth history of the standard strain. Furthermore, the determination part 12 should just specify the state value linked | related with the plant growth index which approximated the identified derived plant growth index. The plant growth index that approximates the derived plant growth index may be, for example, the plant growth index closest to the derived plant growth index. When the growth model is a statistically derived standard growth history, the determination unit 12 may specify a statistical value of the plant growth index that approximates the derived plant growth index in the standard growth history. Furthermore, the determination part 12 should just specify the state value linked | related with the statistical value of the specified plant growth index. The statistical value of the plant growth index that approximates the derived plant growth index may be, for example, the statistical value of the plant growth index that is closest to the derived plant growth index. When the growth model is a standard growth curve, the determination unit 12 may specify a state value determined for the derived plant growth index in the standard growth curve.

  And the determination part 12 should just determine with the growth state of the plant 30 currently grown in the cultivation bed 20 equivalent to the growth state which the specified state value represents.

  The output unit 13 outputs the determined growth state of the plant 30. The output unit 13 may be realized using a display device, for example.

  The processing unit 15 derives the above-described growth model based on the plurality of growth histories stored in the growth state storage unit 14. When the growth model is the growth history of the standard strain, the processing unit 15, for example, according to an instruction from the administrator of the plant state determination device 1 acquired via an input unit (not shown) included in the plant state determination device 1. Identify the growth history of a standard stock. When the growth model is a statistically derived standard growth history, the processing unit 15 performs statistical processing on the plurality of growth histories stored in the growth state storage unit 14 as described above. Deriving the standard growth history. When the growth model is represented by a standard growth curve, the processing unit 15 uses the plurality of growth histories stored in the growth state storage unit 14 to derive a standard growth curve.

  Next, an example of the reflector 21 will be described in detail with reference to the drawings.

  FIG. 3 is a diagram illustrating a first example of the shape of the reflector 21. The reflector 21 shown in FIG. 3 is implemented by a single rectangular reflector having a round hole. The reflector 21 shown in FIG. 3 is installed in the cultivation bed 20, for example so that the plant 30 may pass through a round hole. The shape of the hole opened in the reflector 21 is not limited to a perfect circle. The hole opened in the reflector 21 may not be round.

  As described above, the reflector 21 may be realized by a plurality of reflectors. When the reflector 21 is realized by a plurality of reflectors as in the following example, the reflectance of the upper surface of the cultivation block 20 where the reflectors 21 are installed is adjusted by adjusting the interval of the reflectors. Can do. In that case, when the interval between the reflecting plates is shortened, it is only necessary to increase the number of reflecting plates installed in a range that affects at least the observation result by the illuminance sensor 22.

  FIG. 4 is a diagram illustrating a second example of the shape of the reflector 21. The reflector 21 shown in FIG. 4 is realized by a plurality of strip-shaped reflectors. The reflector 21 shown in FIG. 4 is arrange | positioned at the cultivation bed 20 so that the plant 30 may pass through the clearance gap between the long reflector and the short reflector of the center part of FIG.

  FIG. 5 is a diagram illustrating a third example of the shape of the reflector 21. The reflector 21 shown in FIG. 5 is realized by a plurality of square or substantially square reflectors. The reflector 21 shown in FIG. 5 is arrange | positioned at the cultivation bed 20, for example so that the plant 30 may pass through the clearance gap surrounded by the reflecting plate contained in the reflector 21 of the center part of FIG.

  The shape of the reflector 21 is not limited to a rectangle.

  FIG. 6 is a diagram illustrating a fourth example of the shape of the reflector 21. The reflector 21 shown in FIG. 6 is realized by a single round reflector having a round hole. The reflector 21 shown in FIG. 6 is arrange | positioned at the cultivation bed 20, for example so that the plant 30 may pass the hole currently opened in the reflecting plate. As described above, the shape of the hole opened in the reflector 21 is not limited to a perfect circle. The hole opened in the reflector 21 may not be round.

  Next, operation | movement of the plant state determination apparatus 1 of this embodiment in the case of determining the growth state of the plant 30 is demonstrated in detail with reference to drawings.

  FIG. 7 is a flowchart showing the operation of the plant state determination apparatus 1 of the present embodiment when determining the growth state of the plant 30.

  At the start of the operation shown in FIG. 7, the growth state storage unit 14 stores the above-described growth model derived by the processing unit 15.

  First, the light intensity detection part 10 detects the intensity | strength of the light from the cultivation bed 20 with which the reflector 21 is arrange | positioned and the plant 30 is cultivated by the illumination intensity sensor 22 (step S101). Next, the index estimation unit 11 derives a plant growth index as described above (step S102). The index estimation unit 11 associates the derived plant growth index with the state value. The state value associated with the derived plant growth index represents, for example, the time when the detected intensity, which is the intensity of light from which the plant growth index is derived, is detected. The index estimation unit 11 stores the plant growth index and the state value associated with each other in the growth state storage unit 14 as a part of the growth history of the plant 30 cultivated in the cultivation bed 20 (step S103). The plant growth index and the state value stored in step S103 are used, for example, to derive a growth model that is used to determine the growth state of the plant 30 to be grown next.

  The determination unit 12 specifies a state value representing the standard growth state of the plant 30 from which the derived plant growth index is obtained based on the growth model stored in the growth state storage unit 14 (step S104). And the determination part 12 determines with the state of the growth of the plant 30 cultivated in the cultivation bed 20 from which the light intensity was detected in step S101 being the state of growth represented by the state value specified in step S104. (Step S105).

  The present embodiment described above has an effect that the growth state of the leaves of the plant 30 can be measured at a low cost. The reason is that the determination unit 12 determines the growth state of the plant 30 based on the intensity of light detected by the illuminance sensor 22. The illuminance sensor 22 need not be a spectroscopic sensor. Therefore, the cost is reduced as compared with the case where the spectroscopic sensor is used.

[Second Embodiment]
Next, a second embodiment of the present invention based on the plant cultivation system 100 according to the first embodiment described above will be described. In the following description, the characteristic part according to the present embodiment will be mainly described. In addition, the overlapping description about the structure similar to 1st Embodiment mentioned above is abbreviate | omitted. Below, the plant cultivation system 100A which concerns on this embodiment is demonstrated in detail with reference to drawings.

  FIG. 9 is a diagram schematically showing an overall image of the plant cultivation system 100A of the present embodiment. The plant cultivation system 100A of the present embodiment includes a plurality of illuminance sensors 22 connected to the plant state determination device 1. In this embodiment, each illumination intensity sensor 22 should just be installed so that it may be easy to receive the light from the reflector 21 installed in the periphery of a different specific plant 30. FIG. Each illuminance sensor 22 may be installed so as not to receive light from the reflectors 21 other than the reflectors 21 installed around different specific plants 30. The reflector 21 in the present embodiment is the same as the reflector 21 in the first embodiment. The shape of the reflector 21 of the present embodiment may be any of the examples shown in FIGS. In addition, a plurality of types of plants 30 may be cultivated on the cultivation bed 20.

  The configuration of the plant state determination device 1 of the present embodiment is the same as the configuration of the plant state determination device 1 of the first embodiment of the present invention shown in FIG.

  In the light intensity detection unit 10 of the present embodiment, the plurality of illuminance sensors 22 detect the detection intensity. The illuminance sensor 22 and the type of the plant 30 planted around the place where the reflector 21 where the illuminance sensor 22 is likely to receive light are associated in advance by, for example, an administrator of the plant cultivation system 100A. It only has to be.

  The index estimation unit 11 derives a plant growth index for each illuminance sensor 22 based on the detected intensity.

  The growth state storage unit 14 stores the above-described growth model for each type of plant 30.

  The determination unit 12 determines, for each illuminance sensor 22, the derived plant growth index and the plant 30 from which the derived plant growth index is obtained based on the growth model corresponding to the type of the plant 30 associated with the illuminance sensor 22. Specifies a state value that represents the standard growth state of.

  The output unit 13 outputs a standard growth state represented by the specified state value for each illuminance sensor 22.

  Next, operation | movement of the plant state determination apparatus 1 of this embodiment is demonstrated in detail with reference to drawings. FIG. 7 is a flowchart showing the operation of the plant state determination apparatus 1 of the present embodiment. The plant state determination apparatus 1 performs the operation shown in FIG. 7 for each illuminance sensor 22. The operation of the plant state determination device 1 for each illuminance sensor 22 is the same as the operation of the plant state determination device 1 of the first embodiment.

  In addition, the kind of the plant 30 cultivated in the cultivation bed 20 of this embodiment may not be different. In that case, the plant state determination apparatus 1 of this embodiment can determine a standard growth state for each strain of the plant 30.

  The present embodiment described above has the same effect as the first embodiment. The reason is the same as the reason for the effect of the first embodiment.

  This embodiment further has an effect that a standard growth state can be determined for each strain of the plant 30. This embodiment further has an effect that a standard growth state can be determined for each type of plant 30.

  The reason is that the determination unit 12 specifies the state value for each illuminance sensor 22 based on the detected intensity obtained for each illuminance sensor 22. In the present embodiment, each illuminance sensor 22 is installed so as to easily receive light from the reflector 21 installed around different specific plants 30. Furthermore, each illuminance sensor 22 is installed so that it is difficult to receive light from the reflectors 21 other than the reflectors 21 installed around different specific plants 30. Accordingly, the reflection intensity obtained by each illuminance sensor 22 is greatly influenced by the way the leaves of the plant 30 are attached, which blocks the reflected light from the reflector 21 where the illuminance sensor 22 easily receives light. Therefore, the state value specified for each illuminance sensor 22 can be regarded as representing the state of growth of the plant 30 strain. That is, a standard growth state can be determined for each plant 30 strain. And when the kind of the plant 30 planted in the cultivation bed 20 differs for every stock | strain, a standard state of growth can be determined for every kind of plant 30.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. The present embodiment represents a concept common to the above-described embodiments. Below, 1 A of plant state determination apparatuses which concern on this embodiment are demonstrated in detail with reference to drawings.

  FIG. 10 is a block diagram showing the configuration of the plant state determination device 1A of the present embodiment.

  Referring to FIG. 10, the plant state determination device 1A according to the present embodiment detects the intensity of light incident from a cultivation bed on which a plant is grown using an illuminance sensor, and the detected light intensity is detected. And a determination unit 12 that determines a growth state of the plant based on a detection intensity that is an intensity of light and a reference intensity that is an intensity of the light detected in the absence of the plant.

[Other embodiments]
Each of the plant state determination device 1 and the plant state determination device 1A can be realized by a computer and a program for controlling the computer, dedicated hardware, or a combination of the computer and the computer control program and dedicated hardware. .

  FIG. 11 is a diagram illustrating an example of a hardware configuration of a computer 1000 that can realize the plant state determination device 1 and the plant state determination device 1A. Referring to FIG. 11, a computer 1000 includes a processor 1001, a memory 1002, a storage device 1003, and an I / O (Input / Output) interface 1004. The computer 1000 can access the recording medium 1005. The memory 1002 and the storage device 1003 are storage devices such as a RAM (Random Access Memory) and a hard disk, for example. The recording medium 1005 is, for example, a storage device such as a RAM or a hard disk, a ROM (Read Only Memory), or a portable recording medium. The storage device 1003 may be the recording medium 1005. The processor 1001 can read and write data and programs from and to the memory 1002 and the storage device 1003. The processor 1001 can access, for example, the illuminance sensor 22 via the I / O interface 1004. The processor 1001 can access the recording medium 1005. The recording medium 1005 stores a program that causes the computer 1000 to operate as the plant state determination device 1 or the plant state determination device 1A.

  The processor 1001 loads a program stored in the recording medium 1005 that causes the computer 1000 to operate as the plant state determination device 1 or the plant state determination device 1A into the memory 1002. Then, when the processor 1001 executes the program loaded in the memory 1002, the computer 1000 operates as the plant state determination device 1 or the plant state determination device 1A.

  The light intensity detection unit 10, the index estimation unit 11, the determination unit 12, the output unit 13, and the processing unit 15, for example, have functions of each unit read into the memory 1002 from a recording medium 1005 that stores a program. It can be realized by a dedicated program that can be realized and a processor 1001 that executes the program. The growth state storage unit 14 can be realized by a memory 1002 included in the computer 1000 or a storage device 1003 such as a hard disk device. Alternatively, a part or all of the light intensity detection unit 10, the index estimation unit 11, the determination unit 12, the output unit 13, the growth state storage unit 14, and the processing unit 15 is dedicated for realizing the function of each unit. This circuit can also be realized.

  Moreover, although a part or all of said embodiment can be described also as the following additional remarks, it is not restricted to the following.

(Appendix 1)
A light intensity detection means for detecting the intensity of light incident from the cultivation bed where the plant is grown, with an illuminance sensor;
A determination means for determining a state of growth of the plant based on a detection intensity that is the intensity of the detected light and a reference intensity that is an intensity of the light detected in a state without the plant;
A plant state determination apparatus comprising:

(Appendix 2)
The light intensity detection means detects the intensity of the light incident through the reflector installed on the cultivation bed from the cultivation bed on which a reflector is installed,
The plant state determination device includes index estimation means for deriving a plant growth index representing the degree of leaf growth based on the detected intensity, the planting reference intensity, and the area of the reflector,
The plant state determination device according to claim 1, wherein the determination unit determines a state of growth of the plant based on the plant growth index.

(Appendix 3)
A growth state storage means for storing a growth model representing the relationship between the plant growth index and the state of growth of the plant;
The determination means specifies the state of growth of the plant from which the derived plant growth index is obtained based on the growth model, and the plant that is grown in the cultivation bed with the specified state of growth The plant state determining apparatus according to appendix 2, wherein the plant state is determined to be a growth state of the plant.

(Appendix 4)
The growth state storage means stores, as the growth model, a plurality of different combinations of a state value representing any growth state after the start of plant growth and the plant growth index associated with the growth state. And
The determination means identifies the plant growth index that approximates the derived plant growth index among the plant growth indices stored by the growth state storage means, and is associated with the identified plant growth index The plant state determination apparatus according to appendix 3, wherein the state of growth represented by the state value is determined to be a state of growth of the plant grown in the cultivation bed.

(Appendix 5)
The plant state determination device according to any one of supplementary notes 1 to 4, wherein the reflector is a single flat plate or a plurality of flat plates arranged so as not to overlap each other.

(Appendix 6)
A plant cultivation system provided with the said cultivation bed, the light source which irradiates the said cultivation bed, the said illumination intensity sensor, the said reflector, and the plant state determination apparatus in any one of appendix 1 thru | or 5.

(Appendix 7)
The intensity of light incident from the cultivation bed where the plant is grown is detected by an illuminance sensor,
Based on the detected intensity that is the intensity of the detected light and the reference intensity that is the intensity of the light detected in the absence of the plant, the growth state of the plant is determined.
Plant state determination method.

(Appendix 8)
From the cultivation bed where the reflector is installed, the intensity of the light incident through the reflector installed in the cultivation bed is detected,
Based on the detected intensity, the planting reference intensity, and the area of the reflector, a plant growth index representing the degree of leaf growth of the plant is derived,
The plant state determination method according to appendix 7, wherein the state of growth of the plant is determined based on the plant growth index.

(Appendix 9)
Storing a growth model representing the relationship between the plant growth index and the state of growth of the plant in the state storage means;
Based on the growth model, the state of growth of the plant from which the derived plant growth index is obtained is identified, and the state of growth of the identified plant is the state of growth of the plant grown in the cultivation bed The plant state determination method according to appendix 8, wherein the plant state is determined to be present.

(Appendix 10)
A plurality of different combinations of a state value representing any growth state after the start of plant growth and the plant growth index associated with the growth state are stored in the growth state storage means as the growth model. ,
Among the plant growth indices stored by the growth state storage means, the plant growth index that approximates the derived plant growth index is identified, and the state value associated with the identified plant growth index is represented. The plant state determination method according to appendix 9, wherein the growth state is determined to be a growth state of the plant grown on the cultivation bed.

(Appendix 11)
The plant state determination method according to any one of appendices 7 to 10, wherein the reflector is a single flat plate or a plurality of flat plates arranged so as not to overlap each other.

(Appendix 12)
Computer
A light intensity detection means for detecting the intensity of light incident from the cultivation bed where the plant is grown, with an illuminance sensor;
A determination means for determining a state of growth of the plant based on a detection intensity that is the intensity of the detected light and a reference intensity that is an intensity of the light detected in a state without the plant;
Plant condition determination program to be operated.

(Appendix 13)
Computer
From the cultivation bed in which a reflector is installed, the light intensity detection means for detecting the intensity of the light incident through the reflector installed in the cultivation bed,
Index estimation means for deriving a plant growth index representing the degree of leaf growth of the plant based on the detected intensity, the planting reference intensity, and the area of the reflector;
The determination means for determining the state of growth of the plant based on the plant growth index;
The plant state determination program according to appendix 12, which is operated as described above.

(Appendix 14)
Computer
A growth state storage means for storing a growth model representing a relationship between the plant growth index and the state of growth of the plant;
Based on the growth model, the state of growth of the plant from which the derived plant growth index is obtained is identified, and the state of growth of the identified plant is the state of growth of the plant grown in the cultivation bed Said determination means for determining that there is,
The plant state determination program according to appendix 13, which is operated as described above.

(Appendix 15)
Computer
The growth state storage means for storing a plurality of different combinations of a state value representing any growth state after the start of plant growth and the plant growth index associated with the growth state as the growth model; ,
Among the plant growth indices stored by the growth state storage means, the plant growth index that approximates the derived plant growth index is identified, and the state value associated with the identified plant growth index is represented. The determination means for determining that the state of growth is the state of growth of the plant grown in the cultivation bed,
The plant state determination program according to appendix 14, which is operated as described above.

(Appendix 16)
The plant state determination program according to any one of appendices 12 to 15, wherein the reflector is a single flat plate or a plurality of flat plates arranged so as not to overlap each other.

  The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  According to the present invention, for example, in plant cultivation such as cultivation in a plant factory, it can be applied to plant growth management when cultivating a plant.

DESCRIPTION OF SYMBOLS 1, 1A Plant state determination apparatus 10 Light intensity detection part 11 Index estimation part 12 Determination part 13 Output part 14 Growth state memory | storage part 15 Processing part 20 Cultivation bed 21 Reflector 22 Illuminance sensor 28 Light source 30 Plant 100, 100A Plant cultivation system 1000 Computer 1001 Processor 1002 Memory 1003 Storage device 1004 I / O interface 1005 Recording medium

Claims (10)

A light intensity detection means for detecting the intensity of light incident from the cultivation bed where the plant is grown, with an illuminance sensor;
A determination means for determining a state of growth of the plant based on a detection intensity that is the intensity of the detected light and a reference intensity that is an intensity of the light detected in a state without the plant;
A plant state determination apparatus comprising: The light intensity detection means detects the intensity of the light incident through the reflector installed on the cultivation bed from the cultivation bed on which a reflector is installed,
The plant state determination device includes index estimation means for deriving a plant growth index representing the degree of leaf growth based on the detected intensity, the planting reference intensity, and the area of the reflector,
The plant state determination apparatus according to claim 1, wherein the determination unit determines a state of growth of the plant based on the plant growth index. A growth state storage means for storing a growth model representing the relationship between the plant growth index and the state of growth of the plant;
The determination means specifies the state of growth of the plant from which the derived plant growth index is obtained based on the growth model, and the plant that is grown in the cultivation bed with the specified state of growth The plant state determination apparatus according to claim 2, wherein the plant state is determined to be a growth state of the plant. The growth state storage means stores, as the growth model, a plurality of different combinations of a state value representing any growth state after the start of plant growth and the plant growth index associated with the growth state. And
The determination means identifies the plant growth index that approximates the derived plant growth index among the plant growth indices stored by the growth state storage means, and is associated with the identified plant growth index The plant state determination apparatus according to claim 3, wherein the state of growth represented by the state value is determined to be a state of growth of the plant grown on the cultivation bed. The plant state determination device according to any one of claims 1 to 4, wherein the reflector is a single flat plate or a plurality of flat plates arranged so as not to overlap each other.   A plant cultivation system provided with the said cultivation bed, the light source which irradiates the said cultivation bed, the said illumination intensity sensor, the said reflector, and the plant state determination apparatus in any one of Claims 1 thru | or 5. The intensity of light incident from the cultivation bed where the plant is grown is detected by an illuminance sensor,
Based on the detected intensity that is the intensity of the detected light and the reference intensity that is the intensity of the light detected in the absence of the plant, the growth state of the plant is determined.
Plant state determination method. Computer
A light intensity detection means for detecting the intensity of light incident from the cultivation bed where the plant is grown, with an illuminance sensor;
A determination means for determining a state of growth of the plant based on a detection intensity that is the intensity of the detected light and a reference intensity that is an intensity of the light detected in a state without the plant;
Plant condition determination program to be operated. Computer
From the cultivation bed in which a reflector is installed, the light intensity detection means for detecting the intensity of the light incident through the reflector installed in the cultivation bed,
Index estimation means for deriving a plant growth index representing the degree of leaf growth of the plant based on the detected intensity, the planting reference intensity, and the area of the reflector;
The determination means for determining the state of growth of the plant based on the plant growth index;
The plant state determination program according to claim 8, which is operated as described above. Computer
A growth state storage means for storing a growth model representing a relationship between the plant growth index and the state of growth of the plant;
Based on the growth model, the state of growth of the plant from which the derived plant growth index is obtained is identified, and the state of growth of the identified plant is the state of growth of the plant grown in the cultivation bed Said determination means for determining that there is,
The plant state determination program according to claim 9 to be operated.

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