JPS62215326A - Apparatus for measuring present growth of plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention applies to the field of basic research to embody the idea of developing a plant factory that makes possible what was essentially impossible in conventional agriculture. This invention relates to a device for measuring the current state of growth in the cultivation of 9 leafy vegetables.

[Conventional technology]

Conventionally, the current state of plant growth is 1 weight, 1 volume, and height.

It is supposed to be determined from the planning results such as leaf area, etc., but in reality, all of these are measured (in general, only the items that are suitable for the target plant are measured.

In other words, for leafy vegetables such as saladana and sunny lettuce, there is a way to understand the current state of growth using Ichijusha measurements.

A weight measuring device shown in FIG. 4 has been proposed in the past. This is from page 104 of ``Basic Knowledge and Practice of Plant Factories'' written by Tomiki Takatsuji and published by the Technical Information Center.

The fourth factor is a side view showing the principle of the single tilt measuring device. In the figure, two weights are measured as follows.

The metal rotation ring a and the supported plant support stand a supported the target plants ■ and were immersed in the culture solution Ω of the hydroponic bed ctn. When the superposition of the plant ■ changes, the plant support stand Tsukuda and the metal fixing ring Qυ move up and down, and the pressure transmission disc I connected to the other end of the lever σ fulcrum t13 also moves up and down, so the phosphor bronze plate αe The pressure applied to changes. As a result, the strain in the phosphor bronze plate 1e results in a change in the resistance value of the semiconductor strain gauge αη, and the change in weight is displayed as a voltage change value by the voltmeter 09 via the resistance-voltage converter.

[Problem that the invention seeks to solve]

The conventional weight measuring device shown in FIG. 4 has the advantage of being able to measure the weight of plants in a non-destructive manner while they are still in the cultivation state.

(A1) This measuring device cannot be used for cultivation methods other than hydroponic cultivation.

(b) When used for cultivation, a large amount of measuring equipment is required, which impairs economic efficiency.

(1) When measuring a specific individual with a small number of measuring devices,
If the growth state of the measured individual is different from that of others, it is difficult to measure and grasp the overall growth state.

There was an unresolved issue with the door.

This invention was made to solve the above-mentioned problems, and its purpose is to understand the average growth status when cultivating large quantities of vegetables.

[Means for solving problems]

The plant growth status 21t+1 device according to the present invention includes a light irradiator that irradiates light from above the cultivation bed surface on which plants are planted, and a high reflectance material that emits light reflected from the plants and placed on the cultivation bed surface. The present state of plant growth is measured by measuring the amount of change in the amount of reflected light in combination with a light meter that receives the reflected light from the white reflector.

[For production]

This invention is based on the following features: (1) In the case of leafy vegetables, the orthogonal projection area of the leafy vegetables onto the culture bed surface increases as the leaves spread according to growth, and the apparent reflection is synthesized by integrating the reflectance of the leaves seen from above and the white reflector. The rate decreases with growth (using this fact, 1
Light is emitted downward from the original irradiator, and the current state of growth is measured by measuring changes in the amount of reflected light reflected by the plant and the white reflector using a light meter.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a plant growth status measuring device according to an embodiment of the present invention. In the figure, (1) is a light irradiator, (2) is a light irradiation surface that illuminates the lower part of this light irradiator (1), (3) is a light meter installed in line with the light irradiator (1), (4) is the light receiving surface of this photometer (3) that receives reflected light from below, (5) is a white reflector, and (6) is the culture bed surface, and the white reflector (5) is this culture bed surface. is placed on top of.

■ is a plant that has roots below the surface of the culture bed and grows leaves and stems above the surface of the culture bed.

This device for measuring the current state of plant growth shown in Fig. 1 is installed on a white reflector plate (5) made of a highly reflective material on the culture bed surface (6) on which the plants (2) are planted.
), and above it are a light irradiator (1) with the light emitting surface (2) facing downward and a light meter (1) with the light receiving surface (4) facing downward.
3). Moreover, FIG. 2 is a plan view of the cultivation surface of the plant growth status measuring device shown in FIG. 1.

In this figure, (5) is a white reflective plate.

■ is a plant.

A total of two IliJ methods of the plant growth status measuring device will be explained with reference to FIGS. 1 and 2. In Fig. 2, if the reflectance of the white reflector (5) is R1, the area is A, the reflectance of the plant (■) is R1, and the area of orthogonal projection of the plant (■) onto the white reflector (5) is A1, then this cultivation surface is Average reflectance R seen from above
E is RE yo (A-AI)・R1A4・R10,,011
,,t.

In addition, the light irradiated from the upper light irradiation plate 3 (1) to the white reflector plate (5) and the plant ■ is reflected, and the light beam P that enters the light receiving surface (41) of the light meter (3) is calculated by the above-mentioned average reflection. It is proportional to the rate RE. That is, P=C-RE...
・ljl However, C is an ore corresponding to the irradiance of the white reflector (5) and the surface of the plant (2), and is the amount of light emitted by the light emitter 111.

When the area irradiated with light and the light receiving area of the light meter (3) are constant, it becomes a constant.

Substituting equation U into equation (11) yields.

If R, A, R1, and C are known, the orthogonally projected area A1 of the plant (2) can be determined by measuring the light -P.

The above explanation is the measurement principle, and the practical method is (11
There is no deviation in measuring the average reflectance RE obtained by changing the i1 formula to female form, and in this case, the average reflectance RE8 can be directly determined by calibrating the light meter (3) with a reflector whose reflectance is known. be able to.

Next, as a specific example of measurement, data on saladana will be shown.

Figure 3 is a characteristic diagram showing the relationship between the weight of saladana, the orthogonal projected area A1 on the culture bed surface, and the average reflectance RE, where the horizontal axis (X-axis) is the weight and the vertical axis (Y-axis) is the culture of saladana. A curve α indicates the relative value of the orthogonally projected area A1 onto the floor surface, and a curve β indicates the average reflectance RE.

Here, the reflectance R of the white fouling plate is 80%, the reflectance R1 of the saladana is 13.5%, and the orthogonal projected area A1 is the weight i1
For QOg, it was set as 100%.

As can be understood from this figure, by measuring the average reflectance RE, the state of the orthogonal projected area AI (Y-axis value) and! HaCX-axis value) can be determined, and the current growth status can be understood.

In addition, in this plant growth current measuring device, the irradiation area of the light irradiator il+ and the light receiving area of the light meter (3) are on the culture bed surface (6).
Since it changes in proportion to the square of the height from
It is also possible to measure the average growth status of multiple plants.

In the above example, the white reflector (5) was placed on the culture bed surface (6) (although the case was explained above). It goes without saying that in equipment that uses a high reflectance material such as white Styrofoam, measurements can be made in the same way even if the white reflector (5) is used instead.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a light irradiator with a white reflector mounted on the culture bed surface, the light irradiation surface facing downward above the culture bed surface, and a light meter with the light receiving surface facing downward. Since the device is constructed by installing both, the following effects can be obtained.

tAl It does not depend on the cultivation method and can be used in any cultivation equipment such as hydroponics and soil cultivation.

IB+ It is possible to measure multiple types of plants at the same time, making it easy to understand the current state of growth in mass cultivation equipment.

Since Ic+ can be measured non-destructively, it can be determined at any time without inhibiting the growth of plants.

IDI Measurement conditions can be set without moving the plant, and measurements can be taken at any time during the cultivation period.

[Brief explanation of drawings]

Fig. 1 is a side view showing the principle of a plant growth status measuring device according to an embodiment of the present invention, Fig. 2 is a plan view explaining the invention in detail, and Fig. 3 is an example of the effects obtained by implementing the invention. The characteristic diagram shown in FIG. 4 is a side view showing the principle of a conventional heavy THL measuring device. In the figure, (1) is a light irradiator, (2) is a light irradiation surface, (31 is a light meter, (4) is a light receiving surface, (5) is a white reflector, (6)
is the culture bed surface. The connoisseur is a plant. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In flat plant cultivation equipment for cultivating leafy vegetables such as saladana and sunny lettuce, there is a light irradiator installed above the cultivation bed surface with the light irradiation surface facing the cultivation bed surface below, and a light irradiation device installed alongside this light irradiation device. A light meter with the light-receiving surface facing downward toward the culture bed surface,
A device for measuring the current state of plant growth, characterized in that a white reflector made of a highly reflective material is provided on the cultivation bed surface.