A detection system and method for plant cultivation

Abstract

The application relates to a detection system for plant cultivation, comprising a first detection module configured to acquire leaf surface information of a plant, a second detection module configured to acquire physiological information of the plant, and a regulation module configured to regulate humidity of a plant cultivation environment based on the leaf surface information of the plant acquired by the first detection module and the physiological information of the plant acquired by the second detection module, so as to promote growth of the plant. The application has the advantages that a series of detection and corresponding control activities are started based on whether liquid beads exist on the plant leaf surface as a trigger condition, different modes are selected according to reasons for the liquid beads on the leaf surface to differentially dehumidify the cultivation environment, the influence on the plant growth is reduced to a minimum, and the application ensures that the detection system runs more simply and reduces the operation pressure of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plant cultivation, and particularly relates to a detection system and method for plant cultivation. BACKGROUND

[0002] In the process of plant cultivation, the phenomenon of liquid beads distributed on the plant leaves often occurs, and the condensation or plant spitting water will cause the liquid beads to appear on the plant leaves. When the liquid beads are distributed on the plant leaves, the shielding of the liquid beads to the stomata and the leaf surface will hinder the exchange of CO2 and gas, affect the photosynthesis of the plant, and the cultivation personnel cannot clearly and intuitively obtain the information of the shape, color or vein pattern of the plant leaves, so as to know the growth state or disease state of the plant as early as possible. Especially when the plant is infected with infectious diseases, if the disease spots on the leaf surface cannot be found in time, the disease process of the plant will not be effectively monitored. If the infectiousness and pathogenicity of the disease infected by the plant are strong, and the disease is not effectively controlled in the early stage, a large area of the plant will be damaged. For example, Fang Li et al. found in the research of occurrence regularity and infection characteristics of anthracnose disease of yam (2018) that the conidia produced by the anthracnose fungus spread in the air, attached to the tender leaves of the plant, and rapidly expanded when the conditions were suitable. When the conidia attached to the yam seedlings, the disease spots appeared in about 7-10 days. The research results found that the proportion of diseased plants in the field could be as high as 10%-30%, and even could reach 34.7%, which caused a large decrease in yield. Therefore, it is necessary to find the disease of the plant in time.

[0003] Therefore, when liquid beads appear on the plant leaves, the grower needs to take management measures in time. However, there are mainly two reasons for the appearance of liquid beads on the leaves, one is the condensation phenomenon caused by too high environmental humidity (the relative humidity of the cultivation space is increased by the transpiration of the plant, the evaporation of the cultivation substrate, the nutrient solution, etc.), that is, the air humidity is too large, the water vapor content is saturated, at this time, if the temperature changes, the water vapor will be liquefied on the plant leaves to form dew beads, and the liquid beads are mainly formed on the center of the leaf surface; the other is the plant spitting phenomenon caused by too high root humidity and environmental temperature, the "spitting phenomenon" is also called "dripping phenomenon", because the stomata on the leaves are generally closed at night, the amount of water emitted from the leaves is reduced, and the humidity in the soil is large, the plant roots still strongly absorb water, which causes the amount of water absorbed by the plant to be greater than the amount of water consumed by evaporation, and the excess water is discharged from the water pores at the leaf tip or leaf edge to form water beads. For plant cultivation institutions (such as plant factories or greenhouses), too high soil humidity will cause the plant to spit, and at this time the liquid beads are mainly formed at the leaf tip or leaf edge. Too high humidity in the cultivation environment can easily cause plant diseases, and for the regulation of environmental humidity, the commonly used methods are ventilation, heating, humidity absorption or improvement of irrigation method to reduce the evaporation amount of ground water collection. However, for the plant that occurs spitting phenomenon, the water absorbed by the roots is too much, the excess water accumulates in the leaves and is discharged outside through the water discharge device at the end of the leaf vein to form liquid beads distributed at the leaf tip or leaf edge, at this time, adjusting the environmental humidity cannot directly regulate the root humidity of the plant. On the contrary, the vigorous spitting is regarded as an indicator of vigorous physiological activity of the plant roots and strong seedlings, if the environmental temperature or humidity is adjusted at will at this time to eliminate the liquid beads on the leaf surface, it is likely to cause the environmental temperature or humidity to deviate from the optimal conditions for plant growth, hinder the absorption of nutrients by the plant, and then affect the growth efficiency of the plant that is originally growing vigorously, and finally reduce the yield of the plant.

[0004] It can be seen that when liquid beads appear on the plant leaves, it is necessary to judge the cause of the formation of the liquid beads (condensation phenomenon or spitting phenomenon) and then make different adjustments according to different causes. However, judging the cause of the formation of the liquid beads by judging the position of the liquid beads on the leaves will lead to inaccurate judgment results, because the liquid beads will move on the leaf surface under the action of gravity; moreover, due to the small surface area of the leaves and the dense leaves, if the position of the liquid beads is to be accurately detected, it will inevitably face extremely high detection cost.

[0005] Therefore, it is urgently needed to propose a detection method for plant cultivation, which can distinguish the cause of the formation of the liquid beads by a simple and effective way, and solve the problem of liquid beads on the leaf surface in a targeted manner.

[0006] In addition, on the one hand, there are differences in the understanding of those skilled in the art; on the other hand, a large number of literatures and patents have been studied by the applicant when making the invention, but due to the limitation of space, all details and contents are not listed in detail, but this does not mean that the invention does not have these prior art characteristics, on the contrary, the invention has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0007] During the growth of plants, the phenomenon of liquid beads distributed on the leaves will appear, which will appear when the humidity of the cultivation space is too large or the plants grow vigorously. The existence of liquid beads not only affects the growth process of plants, but also reduces the accuracy of the judgment of the growth state of plants by management personnel. Therefore, when liquid beads appear on the leaves, they need to be treated. Usually, the humidity of the cultivation environment is adjusted, and the method adopted by the management personnel is ventilation, heating, moisture absorption or improvement of the irrigation method to reduce the evaporation of the ground water collection. However, the reasons for the appearance of liquid beads on the leaves are different, and if only a single dehumidification method is adopted according to whether liquid beads appear, in some cases, it will affect the growth of plants. Therefore, the reasons for the appearance of liquid beads on the leaves of plants need to be judged, and then targeted dehumidification methods are adopted according to the reasons for the formation of liquid beads, so as to ensure that plants can be in the most suitable growth conditions. In the prior art, there has been a technical solution that can detect and monitor the growth state and growth index of plant leaves, especially the water content information, through a flexible sensor. For example, the patent document with publication number CN113702448A discloses a wearable plant leaf surface water content monitoring device. The flexible sensor module in the device can collect the current signal of the plant leaf water content information through the sensing element on the surface of the flexible interdigital electrode, and send the current signal to the signal acquisition module. The signal acquisition module receives the current signal and converts it into a digital signal, and sends the digital signal to the system control module. The system control module processes the received digital signal and sends the water content information to the display module to display the water content information. This technical solution can quickly detect the water content on the leaf surface to realize real-time monitoring of the growth state and growth index of crops, and adjust the development of crops according to the evaluation results. However, this technical solution can only realize the intuitive reflection of the overall expression state of the leaf information, such as real-time detection of the water content information on the leaf surface, but cannot realize further accurate detection and analysis of the formation reasons of the above-mentioned water content information, and thus cannot take appropriate control measures to reduce the accumulation of liquid beads on the leaf surface while improving the efficiency of plant growth, resulting in a decrease in the optimization and adjustment efficiency of plant cultivation.

[0008] In view of the deficiencies of the prior art, the present application provides a detection system for plant cultivation, comprising:

[0009] The first detection module is configured to acquire leaf information of the plant,

[0010] a second detection module configured to acquire physiological information of the plant, and

[0011] The control module is in communication connection with the first detection module and the second detection module, and is configured to adjust the humidity of the space where the underground part or the aboveground part of the plant is located based on the leaf surface information of the plant obtained by the first detection module and the physiological information for judging the root water absorption condition of the plant obtained by the second detection module. The prior art has appeared the technical solution of detecting the relevant parameters of the environmental humidity and adjusting the environmental humidity of the corresponding growth stage of the plant according to the specific species of the plant. For example, the patent document with publication number CN116439049A discloses a humidity control planting system and method based on plant growth cycle, which obtains the species of the plant and the growth state of the plant, determines the humidity suitable for the growth of the plant, then judges whether the existing environmental humidity is suitable for the growth of the plant, and if the existing environmental humidity is not suitable for the growth of the plant, adjusts the environmental humidity, so that the environmental humidity is always in the humidity suitable for the growth of the plant. However, this technical solution can only detect and analyze the change of the humidity in the environment, and cannot detect the specific reason for the formation of liquid beads on the plant leaves. According to this technical solution, only the environmental humidity in the air can be adjusted, and the formation mode of liquid beads caused by the plant itself cannot be solved by adjusting the environmental humidity, and even the possibility of aggravating the formation of liquid beads on the leaves exists. Therefore, it is very important to accurately judge the reason for the appearance of liquid beads on the leaves of the plant to accurately adjust the growth state of the plant. Compared with the above prior art, the present application can analyze the growth state of the plant when the liquid beads are formed on the leaves to determine the specific reason for the formation of the liquid beads, and slow down or eliminate the liquid beads formed on the leaves without affecting the overall growth state of the plant. Based on the above technical features, the problem to be solved by the present application can include: how to accurately detect and analyze the formation reason of the presented leaf related information. Specifically, when liquid beads appear on the leaves, the conventional processing method in the prior art is to directly increase the gas flow rate in the plant planting environment to carry away the water in the plant planting environment, thereby reducing the environmental humidity and the formation rate of liquid beads on the leaves, and finally removing the liquid beads on the leaves. However, if the reason for the appearance of liquid beads on the leaves of the plant is that the roots of the plant absorb too much water, the excess water accumulates in the leaves and is discharged out of the body through the drain at the end of the leaf vein to form liquid beads distributed at the leaf tip or leaf edge, then adjusting the environmental humidity cannot directly adjust the humidity of the roots of the plant, and cannot solve the problem of the appearance of liquid beads on the leaves from the root cause, thereby affecting the normal growth state of the plant.Based on this, the application adopts different dehumidification modes by judging the reason of liquid bead formation on the leaf surface, when the obtained reason of liquid bead formation is that the root humidity of the plant is too large or the physiological activity of the plant root is very active, the root humidity is directly dehumidified to reduce the root humidity, so as to avoid the root disease caused by the plant root in the condition of too large humidity for a long time or the misjudgment of the plant growth state caused by the continuous existence of the liquid bead on the leaf surface; when the obtained reason of liquid bead formation is that the humidity of the space above the ground where the plant grows is too large, the space above the ground of the plant is directly dehumidified, and the targeted dehumidification mode can ensure that the environment condition of too large humidity is improved in time, so that the plant grows in the suitable environment condition, and the plant disease or death is reduced.

[0012] Preferably, the control module is configured to control the second detection module to start working to obtain the physiological information of the plant when the leaf surface information obtained by the first detection module is the information that the liquid bead is generated on the leaf surface. Compared with the prior art, the application can not only detect the leaf surface information, but also further detect and analyze the reason of the change of the leaf surface information when the leaf surface information changes. Based on the above technical features, the problem to be solved by the application can include how to detect and analyze the reason of the liquid bead generated on the leaf surface. Specifically, as described above, when the liquid bead information appears on the leaf, the conventional processing method in the prior art is to directly adjust the environment parameters, and the reason of the liquid bead is not further detected and analyzed. Even if the state of the liquid bead accumulation on the leaf can be changed in a short time, the normal growth state of the leaf cannot be maintained for a long time, and the frequent change of the environment parameters will affect the normal growth state of the plant, thereby reducing the effect of plant cultivation. Further, the detection and analysis of the leaf information and the reason of the change of the leaf information for a long time will significantly increase the energy consumption of the overall plant cultivation system, thereby reducing the overall economic benefit. Based on this, the first detection module is arranged to preliminarily judge whether the plant leaf has liquid bead, and the second detection module is started to judge the growth state of the plant when the liquid bead appears on the leaf, so that the multiple detection modules are not started at the same time, and the unnecessary energy consumption is reduced.

[0013] Preferably, the physiological information includes stem flow, transpiration, and photosynthetic rate of the plant. The stem flow, transpiration, and photosynthetic rate are selected as indexes reflecting whether the physiological activity of the plant is active. The stem flow and the transpiration can directly reflect the water absorption state of the plant root, and the photosynthetic rate indirectly reflects the water absorption state of the plant root. By comparing the actually detected stem flow, transpiration or photosynthetic rate with the preset range, whether the water absorption of the plant root is active is judged, so that different modes of dehumidifying the space where the underground part or the aboveground part is located are selected to improve the dehumidification efficiency.

[0014] Preferably, the regulating module is configured to dehumidify the space where the underground part of the plant is located in the first mode when the stem flow and / or photosynthetic rate exceeds the upper limit of the preset range, wherein,

[0015] The preset range refers to the variation range of the stem flow and / or photosynthetic rate of the plant under suitable environmental conditions. Compared with the prior art, the regulating module of the present application can start corresponding regulation measures according to different growth information of the plant. Based on the above distinguishing technical features, the problem to be solved by the present application can include: how to improve the regulation efficiency of liquid beads on the leaves of the plant. Specifically, when the water absorption of the plant roots is in a vigorous state, it is judged that the liquid beads on the leaf surface are caused by strong water absorption activity of the roots, and thus the space where the plant roots are located is directly ventilated and dried or drained or the contact area between the roots and the nutrient solution is directly reduced, so as to quickly reduce the humidity of the root environment, and finally reduce the water absorption rate of the plant roots and reduce the formation of liquid beads. Through the above setting mode, the following two technical effects can be achieved: on the one hand, the growth state of the plant can be monitored through the detection of the physiological information of the plant, and on the other hand, the liquid bead formation information on the leaf can be kept under normal conditions under the premise of meeting the regulation requirements of the normal growth state of the plant, further ensuring that the plant maintains normal photosynthesis to improve the effect of plant cultivation.

[0016] Preferably, the first mode refers to dehumidification by ventilating the plant roots and / or reducing the height of the liquid surface in contact with the plant roots. The liquid beads caused by vigorous water absorption of the roots directly reduce the humidity of the space where the roots are located. If the above-ground space where the plant is located is directly dehumidified, the humidity of the space where the roots are located is still too large, and accordingly, the water absorption rate of the roots cannot be controlled, and the liquid beads on the leaf surface cannot be eliminated in time.

[0017] Preferably, the regulating module is configured to dehumidify the space where the above-ground part of the plant is located in the second mode when the stem flow and / or photosynthetic rate is in the preset range. When the water absorption of the plant roots is in a normal state, it is indicated that the generated liquid beads are caused by the high humidity of the surrounding environment, and the humidity of the space where the above-ground part of the plant is located needs to be reduced.

[0018] Preferably, the second mode refers to simultaneously ventilating and heating the space where the above-ground part of the plant is located to dehumidify the cultivation environment. Preferably, the second mode refers to ventilating at a low air speed and heating at a low heating capacity to simultaneously dehumidify the cultivation environment. Preferably, the air speed is set to 0.3-0.5 m / s and the heating capacity is set to 30-50 kW. Compared with the prior art, the regulation module of the present application can adjust the environmental parameters of the above-ground part of the plant in different ways. Based on the above technical features, the problem to be solved by the present application can include: how to reduce the energy consumption burden of the overall system while meeting the overall environmental parameter regulation requirements, thereby improving the regulation efficiency of the plant cultivation system regulation module. Specifically, when the stem flow and / or photosynthetic rate of the plant is detected to be within the preset range, it indicates that the current other environmental conditions are suitable for plant growth, and if ventilation and dehumidification are started, part of the heat in the environment will be taken away, causing the environmental conditions to deviate from the conditions suitable for plant growth, so heating is needed at the same time. The humidity condition has little effect on the growth of the plant, and the dehumidification time can be extended for a certain period of time, so the ventilation condition is controlled to be low air speed, and under the condition of low air speed, the heat loss is not too fast, and a large amount of heat needs to be supplied to maintain the environmental temperature, so the ventilation and heating modules are both in a low power state, avoiding excessive load on the cultivation system.

[0019] Preferably, the regulation module is configured to dehumidify the space where the above-ground part of the plant is located in a third mode when the stem flow and / or photosynthetic rate exceeds the upper limit of the preset range. Preferably, the third mode refers to dehumidifying the space where the above-ground part of the plant is located by alternately ventilating and heating. Preferably, the third mode refers to dehumidifying the cultivation environment by alternately ventilating at a high air speed and heating at a high heating capacity. Preferably, the air speed is set to 1-2 m / s and the heating capacity is set to 100-500 kW. When the detection result is that the stem flow and / or photosynthetic rate is lower than the lower limit of the preset range, it indicates that the water absorption of the plant roots is not in a vigorous state, the liquid beads on the plant leaves are caused by the surrounding environmental humidity, and the growth of the plant is affected, indicating that the humidity condition has affected the normal growth state of the plant, so dehumidification needs to be the first priority to ensure that the plant returns to a normal growth state. To this end, the ventilation condition is controlled to be high air speed to quickly dehumidify, and under the condition of high air speed, the heat loss will also increase accordingly, and a large amount of heat needs to be supplied to maintain the environmental temperature, so a high heating capacity is provided. Since high air speed and high heating capacity require the ventilation module and the heating module to be adjusted to a high power state, the simultaneous operation of the two will increase the operating load of the cultivation system and reduce the service life of the cultivation system, so the ventilation and heating are alternately controlled to quickly dehumidify the cultivation environment of the plant.

[0020] Preferably, the third mode of ventilation air speed is greater than the second mode of ventilation air speed.

[0021] Preferably, the third mode of heating amount is greater than the second mode of heating amount. When the plant leaves form liquid beads and are in a normal growth state, both the conditions of the growth environment of the plant and dehumidification are needed. In the second mode, it is very important to maintain the environmental conditions other than the dehumidification degree, and the dehumidification time does not need to be controlled to be very short, so a low air speed is selected for dehumidification. In the third mode, dehumidification is the first purpose, and it is necessary to achieve the purpose of dehumidification in the shortest possible time, so a high air speed is selected for dehumidification. Accordingly, the heat carried away by the low air speed is less, and the required heating amount is also less; the heat carried away by the high air speed is more, so the required heating amount is more, and increasing the heating amount is also a means to assist dehumidification, that is, the high air speed and high heating in the third mode can both quickly dehumidify and maintain the environmental temperature.

[0022] The present application provides a detection method for plant cultivation, comprising the following steps:

[0023] Obtaining leaf surface information of the plant;

[0024] Obtaining physiological information for judging the root water absorption condition of the plant;

[0025] Adjusting the humidity of the space where the underground part or the aboveground part of the plant is located based on the leaf surface information and the physiological information of the plant.

[0026] Preferably, the leaf surface information refers to information about whether liquid beads are generated on the leaves of the plant, including information about liquid beads generated on the leaves and information about no liquid beads generated on the leaves of the plant.

[0027] Beneficial effects:

[0028] Based on the problem of liquid beads appearing on the leaves of the plant during cultivation, the traditional method is to take a single means, such as reducing the humidity of the environment by ventilating and heating the cultivation environment of the plant, and the reason for the liquid beads appearing on the leaves is not analyzed, such as the plant itself being in a vigorous growth period, accordingly, the physiological activity of the plant roots will be active, and thus the phenomenon of spitting water appears, or the humidity in the closed cultivation environment is large and the condensation phenomenon appears. The traditional dehumidification method does not distinguish the reason for the liquid beads appearing and directly dehumidifies the cultivation environment, although the humidity of the surrounding space environment can be reduced, but this dehumidification method cannot guarantee that the humidity of the environment where the roots are located is also reduced, and when the humidity condition of the roots is not improved for a long time, the problem of root rot and even plant death is easily caused.

[0029] Therefore, the present application sets the first detection module to preliminarily judge whether the plant leaf surface has liquid beads, and when it is determined that the leaf surface has liquid beads, the second detection module is started to judge the growth state of the plant. The advantage of this setting is that it avoids starting multiple detection modules at the same time and reduces unnecessary energy consumption. In the present application, the photosynthetic rate of the plant is measured to reflect the growth state of the plant, and the real-time measured photosynthetic rate of the plant is compared with the preset range of the photosynthetic rate to determine whether the plant is in a vigorous growth state, so as to analyze whether the liquid beads on the leaf surface are caused by the vigorous physiological activity of the root of the plant, and then targeted dehumidification measures are taken.

[0030] When the detection result of the second detection module is that the stem flow and / or the photosynthetic rate exceeds the upper limit of the preset range, it indicates that the plant is in a vigorous growth state, and the physiological activity of the root of the plant is very active, and the root system will have strong water absorption activity. Therefore, the regulation module dehumidifies in the first mode, which is to directly ventilate and dry the space where the plant root is located or drain water or directly reduce the contact area between the root and the nutrient solution, so as to finally achieve the purpose of rapidly reducing the humidity of the root environment. In the past, although the phenomenon of liquid beads on the plant leaf surface can be eliminated by adjusting the humidity in the cultivation environment, this measure does not dehumidify the root, and the humidity of the plant root is still high. If the root humidity is high for a long time, it will lead to the occurrence of diseases and pests.

[0031] When the detection result of the second detection module is that the stem flow and / or the photosynthetic rate is within the preset range, it indicates that the plant is in a normal growth condition, and the liquid beads on the plant leaf surface are caused by the high humidity of the surrounding environment, but this humidity condition does not affect the normal growth of the plant. The regulation module dehumidifies in the second mode, which is to ventilate and heat the cultivation environment of the plant growth at the same time. This is because the photosynthetic rate of the plant is within the preset range, indicating that the current other environmental conditions are suitable for plant growth. Ventilating the cultivation environment will take away part of the heat, resulting in a decrease in the temperature of the cultivation environment, deviating from the suitable conditions for plant growth. Therefore, heating is needed at the same time as ventilation. On the other hand, although liquid beads appear and dehumidification is needed, the stem flow and / or the photosynthetic rate of the plant is not affected, indicating that the humidity condition has little effect on the plant. Therefore, the ventilation condition is controlled to be low wind speed, and under the condition of low wind speed, the heat loss is not too fast, and a large amount of heat does not need to be supplemented to maintain the temperature of the environment. That is, under the condition of starting low wind speed ventilation, the heating capacity of the cultivation environment can be set to 30-50 kW. The advantage of this setting is that the temperature condition of the cultivation environment is maintained in the suitable range during the ventilation process, and the modules of ventilation and heating are both in a low power state. Even if they are running at the same time, they will not bring too much load to the operation of the whole system.

[0032] When the detection result of the second detection module is that the stem flow and / or the photosynthetic rate is lower than the lower limit of the preset range, it indicates that the plant is in a non- vigorous growth state, or the growth of the plant is affected, the liquid beads on the leaf surface of the plant are caused by high ambient humidity, and the ambient humidity conditions have affected the normal state of the plant. Therefore, the first purpose is to dehumidify the environment, and the ambient humidity needs to be quickly reduced. Therefore, the control ventilation condition is high wind speed. Under the condition of high wind speed, the heat loss will also be correspondingly accelerated, and a large amount of heat needs to be supplied to maintain the ambient temperature. Therefore, a high heating capacity of 100-500 kW is provided. In this case, the control ventilation and heat supply are alternately performed to dehumidify the plant cultivation environment. The reason for this setting is that high wind speed and a large amount of heat supply require stronger power to realize, so a large power is needed to drive the ventilation module and the heat supply module, so that the temperature can be quickly restored when high wind speed is performed. However, simultaneously operating the high-power ventilation module and the heat supply module will increase the operating load of the cultivation environment. The high wind speed and the large amount of heat supply are alternately performed to relieve the operating pressure of the cultivation environment. In addition, high wind speed ventilation is performed for a period of time to reduce the ambient humidity. After stopping the high wind speed, the heat supply is started to supplement the heat loss of the cultivation environment, so as to maintain the ambient temperature. In addition, the heat supply is also an auxiliary means for dehumidification.

[0033] Therefore, the present application applies corresponding dehumidification measures according to the specific reasons for the appearance of liquid beads on the plant, and selects different dehumidification methods for different cultivation systems (substrateless cultivation system and solid cultivation system). The targeted and differential detection and adjustment method can efficiently detect and process the liquid beads on the leaf surface without damaging or hindering the growth state of the plant, thereby providing a clear observation field for the cultivation personnel to observe the shape of the leaf. The growth conditions of the plant can be maintained in a suitable range, and the purpose of dehumidification can be achieved, thereby minimizing the operating pressure of the system. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a simplified module connection relationship schematic diagram of the detection system of a preferred embodiment provided by the present application;

[0035] Figure 2 is a simplified schematic diagram of a water culture system of a preferred embodiment provided by the present application.

[0036] LIST OF REFERENCE NUMERALS

[0037] 100: first detection module; 200: second detection module; 300: regulation and control module; 400: ventilation module; 500: heat supply module; 600: water culture system; 610: cultivation tank; 620: nutrient supply pool; 630: pipeline assembly; 631: pump. DETAILED DESCRIPTION

[0038] The application will be described in detail below with reference to the accompanying drawings.

[0039] The temperature and humidity of the environment have a great impact on plants. Temperature and humidity are closely related. Plants are not simply affected by temperature or humidity, but by a combination of the two. Therefore, in a certain temperature, the humidity of the air should also be relatively stable to ensure the normal growth of plants.

[0040] The leaf information refers to information about whether the plant's leaves produce liquid beads, including information about the plant's leaves producing liquid beads and information about the plant's leaves not producing liquid beads. The root water absorption condition refers to the speed of water absorption by the plant's roots and the amount of water absorbed by the plant's roots, which is used to determine the water absorption state of the plant's roots. The reaction physiological information refers to physiological indicators that reflect the growth conditions of the plant, including at least information about photosynthetic characteristics, transpiration rate, transpiration amount, transpiration flow, stem flow, water absorption amount, stomatal conductance, etc. Among them, the photosynthetic characteristics mainly refer to the photosynthetic rate and photosynthetic productivity of the plant.

[0041] In this embodiment, the suitable environmental conditions refer to environmental conditions that can enable the plant to exert maximum productivity. For example, changes in environmental conditions such as light intensity, light duration, temperature, moisture, air, and nutrients can affect the growth and yield of the plant. When the environmental conditions are within the range suitable for the growth and development of the plant, the growth efficiency of the plant reaches a high level, ensuring that its yield reaches an optimal level. For example, when cultivating corn, the environmental temperature needs to be 28-35℃, the light duration needs to be no less than 8h, and the soil humidity needs to be 60%~70%. Under these conditions suitable for the growth of corn, the yield of corn can reach the theoretical maximum.

[0042] Embodiment 1

[0043] As shown in Figure 1 The present embodiment provides a detection system for plant cultivation, comprising:

[0044] The first detection module 100 is configured to obtain leaf information of the plant, the second detection module 200 is configured to obtain physiological information of the plant, and the regulation module 300 is configured to adjust the humidity of the space where the underground part or the aboveground part of the plant is located based on the leaf information of the plant obtained by the first detection module 100 and the physiological information obtained by the second detection module 200 to judge the root water absorption condition of the plant, so as to promote the growth of the plant.

[0045] Preferably, the first detection module 100 is configured to obtain information about whether the plant's leaves produce liquid beads.

[0046] Preferably, the physiological information is photosynthetic characteristic information of the plant. The physiological information is photosynthetic rate of the plant. Preferably, the second detection module 200 is configured to acquire photosynthetic characteristics of the plant. Specifically, the second detection module 200 is configured to acquire photosynthetic rate and / or photosynthetic productivity of the plant. Detecting photosynthetic characteristics of the plant can obtain photosynthetic capacity of the plant, and in turn measure the level of energy storage and organic matter production of the plant, i.e. reflect the growth activity state of the plant.

[0047] Preferably, the control module 300 is configured to control the second detection module 200 to start working to acquire the photosynthetic rate of the plant when the leaf surface information shows information with liquid beads.

[0048] Preferably, the control module 300 is configured to dehumidify the plant cultivation environment in a first mode when the photosynthetic rate exceeds the upper limit of the preset range.

[0049] Preferably, the first mode refers to ventilating and dehumidifying the root of the plant.

[0050] Preferably, the preset range refers to the range of variation of the rate of photosynthesis of the plant under suitable environmental conditions.

[0051] Preferably, the control module 300 is configured to dehumidify the plant cultivation environment in a second mode when the photosynthetic rate is within the preset range.

[0052] Preferably, the second mode refers to ventilating and heating the cultivation environment of the plant at the same time to dehumidify the cultivation environment. Preferably, the second mode refers to ventilating at a low air speed and heating at a low heating capacity at the same time to dehumidify the cultivation environment. According to an embodiment, the air speed in the second mode is set to 0.3-0.5 m / s, and the heating capacity is set to 30-50 kW.

[0053] Preferably, the control module 300 is configured to dehumidify the plant cultivation environment in a third mode when the photosynthetic rate is below the lower limit of the preset range.

[0054] Preferably, the third mode refers to ventilating and heating alternately to dehumidify the cultivation environment of the plant. Preferably, the third mode refers to ventilating at a high air speed and heating at a high heating capacity alternately to dehumidify the cultivation environment. Specifically, the air speed in the third mode is set to 1-2 m / s, and the heating capacity is set to 100-500 kW.

[0055] Since high air speed and large heating capacity require higher power bands to quickly restore temperature, the power consumption is large, which will increase the load operation of the system.

[0056] Preferably, the photosynthetic rate is net photosynthetic rate. The size of the photosynthetic rate can be expressed by the carbon dioxide absorbed or the oxygen released per unit time per unit leaf area.

[0057] Different plants have different growth characteristics, and therefore, the preset range is set according to the actual cultivated plant. In this embodiment, taking tomato as an example, the preset range of the photosynthetic rate is set to 7.04-13.55 μmol·m -2 ·s -1 The upper limit of the preset range of the photosynthetic rate is 13.55 μmol·m -2 ·s -1 The lower limit of the preset range of the photosynthetic rate is 7.04 μmol·m -2 ·s -1 Preferably, the second detection module 200 is in communication connection with the control module 300, so as to send the acquired photosynthetic rate of the plant to the control module 300.

[0058] When the photosynthetic rate is greater than 13.55 μmol·m -2 ·s -1 , it indicates that the physiological activity of the plant root system is vigorous, the growth state of the plant is vigorous, and the liquid bead on the leaf surface is the plant spitting phenomenon. The control module 300 adopts the first mode to dehumidify the root system of the plant based on the plant spitting phenomenon.

[0059] Preferably, the bottom and / or side of the planting pot or planting box for cultivating plants is provided with a plurality of drainage ports, and the drainage ports have a closed state and an open state. The control module 300 can control the drainage ports to be closed or open. When the control module 300 selects the first mode to dehumidify the root system of the plant, the drainage ports are controlled to be in the open state, so that the excess water of the root part flows out from the drainage ports, and the humidity of the root part environment is reduced.

[0060] Preferably, the planting box for cultivating plants is provided with a ventilation duct. The ventilation duct is arranged adjacent to the root of the plant. A plurality of openings are formed on the wall of the ventilation duct. The ventilation duct has an air inlet and an air outlet. One end of the air inlet is provided with a fan unit to provide air volume. The adjustment module can control the on-off of the fan unit. When the fan unit starts to work, the generated air enters the ventilation duct from the air inlet, flows along the extension direction of the duct, and due to the plurality of openings formed on the wall of the ventilation duct, the entering air can flow from each opening to the root and the gap, and finally discharged from the air outlet. This arrangement increases the air flow rate of the root space, and plays a role in reducing the humidity of the root space. During the first mode of dehumidifying the root environment, the first detection module 100 monitors whether the leaf surface of the plant still has liquid beads in real time. Preferably, the first detection module 100 continuously monitors the leaf surface of the plant. Preferably, the first detection module 100 monitors the leaf surface of the plant at certain interval time. Specifically, the interval time can be set to 10 min, 20 min, 30 min, 40 min, 50 min, 60 min. When it is detected that the leaf surface of the plant does not have liquid beads, the first detection module 100 sends the information to the control module 300, and the control module 300 controls to close the first mode of dehumidification.

[0061] When the photosynthetic rate is detected to be 7.04-13.55 μmol·m -2 ·s -1 , it indicates that the plant is in a normal growth state, and the control module 300 adopts the second mode to dehumidify the cultivation environment of the plant. Specifically, the wind speed is set to 0.3-0.5 m / s; the heating capacity is set to 30-50 kW.

[0062] When the photosynthetic rate is detected to be less than 7.04 μmol·m -2 ·s -1 , it indicates that the plant is in an abnormal growth state, and the humidity of the environment has affected the normal growth of the plant, and the control module 300 adopts the third mode to dehumidify the cultivation environment of the plant. Specifically, the wind speed is set to 1-2 m / s; the heating capacity is set to 100-500 kW.

[0063] Preferably, the cultivation environment of the plant has a heating module 500 and a ventilation module 400. Preferably, the ventilation module 400 includes a fan unit and a ventilation port. Preferably, the heating module 500 is in communication connection with the control module 300. The ventilation module 400 is in communication connection with the control module 300. The ventilation module 400 and the heating module 500 can respond to the control instructions of the control module 300. Preferably, the heating module 500 has heating and / or refrigeration functions, which can be a central control air conditioner, an electric heater, an air source heat pump, a multi-source heat pump, etc.

[0064] When the second mode or the third mode is used for ventilation and dehumidification, the temperature in the cultivation environment is correspondingly affected. Especially in winter, the outside temperature is low, and the closed time of the cultivation environment is longer. After the humidity in the cultivation environment increases, dehumidification measures need to be taken in time, and ventilation will take away the heat in the cultivation environment, thereby reducing the temperature of the cultivation environment. In particular, in the second mode, the plants are in a normal growth state, but the ventilation causes the temperature of the cultivation environment to decrease, so that the temperature of the cultivation environment deviates from the optimal growth conditions of the plants, thereby reducing the growth efficiency of the plants. Dehumidification and temperature regulation are performed simultaneously. The wind speed for dehumidification is small, and the temperature difference will not be too large, and the power consumption for heating will not be too large, so simultaneous performance will not increase the load of the plant factory.

[0065] In the third mode, the photosynthetic rate of the plants is lower than the preset range, indicating that the high environmental humidity has affected the normal growth of the plants. At this time, the primary purpose is dehumidification, and high-speed ventilation and high heating are alternately performed. High-speed ventilation can quickly remove the humidity in the cultivation environment, but it will also take away the heat in the cultivation environment. Therefore, heat needs to be supplemented. In this embodiment, the alternation of high-speed ventilation and high heating can avoid the simultaneous performance of high-speed ventilation and large heating, which causes the load of the plant factory to be too large. The alternation of ventilation and heating ensures the uniform distribution of the load. If high-speed ventilation and high heating are started at the same time, even if a large amount of heat is generated, the heat will be quickly taken away due to the excessively large wind speed, resulting in waste.

[0066] The detection module of the present embodiment starts a series of detection and corresponding control activities as a trigger condition for whether liquid beads exist on the plant leaves. Only the first detection module 100 needs to complete the real-time monitoring task, and the remaining detection modules, the heating module 500 and the ventilation module 400 are all in a standby state waiting to be awakened. Such a setting avoids the high energy consumption of long-term and indiscriminate real-time monitoring of multiple modules, ensures more streamlined system operation, and reduces the system operation pressure.

[0067] Preferably, the first detection module 100 can be an infrared sensor, an infrared thermal imager. Specifically, the first detection module 100 can be an infrared light / heat sensor. Preferably, the connection between the first detection module 100 and the control module 300 is Bluetooth connection, wireless connection.

[0068] Preferably, the first detection module 100 can be an image acquisition module. Specifically, the first detection module 100 is a high-definition camera.

[0069] Preferably, the second detection module 200 can be a plant photosynthesis meter. Specifically, the second detection module 200 can be a TP-PM-1 photosynthetic rate meter, a FK-GH30 photosynthesis meter. Preferably, the second detection module 200 is in communication connection with the control module 300. Preferably, the connection between the second detection module 200 and the control module 300 is Bluetooth connection, wireless connection.

[0070] Preferably, the first detection module 100 is in communication connection with the control module 300. The first detection module 100 sends the acquired plant leaf surface information in the cultivation environment to the control module 300, and the control module 300 receives the information and extracts and analyzes it. Preferably, the control module 300 can be a computer, a PLC, or a single-chip microcomputer. For example, a QS30 H20 photoelectric sensor is used to detect whether there are liquid droplets on the leaf surface. When liquid droplets are detected on the plant leaf surface, the first detection module 100 sends the information that the leaf surface has liquid droplets to the control module 300, and the control module 300 receives the signal and controls the second detection module 200 to start working; when no liquid droplets are detected on the plant leaf surface, the control module 300 does not start the control action.

[0071] For example, an infrared sensor is used to collect the leaf surface information of the plant. Since the leaf surface and the liquid droplets on the leaf surface belong to different substances, different substances have different transmittances to infrared rays. When the infrared sensor emits infrared rays to the detection area, the infrared rays contact different substances after reaching the detection area, the emission characteristics change, different signals are generated and detection information is formed, and the detection information is sent to the control module 300, so that it can be judged whether the plant leaf surface has liquid droplets. Preferably, the control module 300 is provided with a storage unit, and the storage unit at least stores reference information of the plant leaf surface with liquid droplets and reference information of the plant leaf surface without liquid droplets. Specifically, the storage unit stores reference information of the plant leaf surface with liquid droplets and reference information of the plant leaf surface without liquid droplets obtained by the infrared sensor. When the control module 300 receives the leaf surface information from the first detection module 100, the real-time acquired leaf surface information is compared with the reference information in the storage unit to obtain information of whether the leaf surface has liquid droplets. When the control module 300 obtains information that the leaf surface does not have liquid droplets, the control module 300 controls to stop the dehumidification work.

[0072] Embodiment 2

[0073] This embodiment is a further improvement of embodiment 1, and the repeated contents will not be described again.

[0074] This embodiment takes tomato cultivation as an example for illustration.

[0075] According to a preferred embodiment, the detection system further comprises a third detection module. Preferably, the third detection module is a humidity sensor. Preferably, the ventilation module 400 comprises a ventilation pipe arranged at the root of the plant and a fan unit for providing air flow. Preferably, the humidity sensor is capable of detecting the humidity of the environment where the root of the plant is located and the humidity of the environment where the above-ground part of the plant is located. Preferably, the third detection module comprises a soil humidity detector and a humidity sensor. Preferably, the third detection module is in communication connection with the control module 300. Specifically, the connection between the third detection module and the control module 300 is a Bluetooth connection or a wireless connection. After the first detection module 100 obtains the leaf surface information of the plant, the first detection module 100 sends the leaf surface information to the control module 300. The control module 300 receives the leaf surface information and compares the leaf surface information with reference information. When it is determined that the leaf surface of the plant has liquid beads, the control module 300 controls the second detection module 200 to be turned on. Preferably, the second detection module 200 detects the water absorption amount of the root system of the plant. Preferably, the water absorption amount of the plant is obtained by an LD-ZSS digital display plant moisture condition detector.

[0076] When the water absorption amount exceeds the upper limit of the preset range, the control module 300 controls the ventilation module 400 to dehumidify the plant cultivation environment in the first mode. The control module 300 controls the ventilation module 400 to be turned on to dehumidify the root of the plant. When the water absorption amount of the root system of the plant is too large, it indicates that the humidity in the soil is large, and the root system absorbs water strongly, resulting in that the water absorption amount of the plant is greater than the evaporation consumption, and thus liquid beads are formed on the leaf surface.

[0077] Preferably, the preset range refers to the change range of the water absorption amount of the plant under suitable environmental conditions. Preferably, the preset range is set to 10% to 12%. After the liquid beads on the leaf surface are eliminated, the third detection module detects the soil humidity and the humidity of the environment where the above-ground part of the plant is located. When the humidity is in the suitable range, the control module 300 controls the ventilation module 400 and the second detection module 200 to be turned off.

[0078] When the water absorption amount is within the preset range, the control module 300 controls the ventilation module 400 to dehumidify the plant cultivation environment in the second mode. The control module 300 controls the ventilation module 400 to be turned on to dehumidify the plant cultivation environment. After the liquid beads on the leaf surface are eliminated, the third detection module detects the soil humidity and the humidity of the environment where the above-ground part of the plant is located. When the humidity is in the suitable range, the control module 300 controls the ventilation module 400 and the second detection module 200 to be turned off.

[0079] When the water absorption amount is below the lower limit of the preset range, the regulating module 300 controls the ventilation module 400 to dehumidify the plant cultivation environment in the third mode. The regulating module 300 controls the ventilation module 400 to start working to dehumidify the plant cultivation environment. After the liquid beads on the leaf surface are eliminated, the third detection module detects the soil humidity and the humidity of the environment where the aboveground part is located. When the humidity is in the appropriate range, the regulating module 300 controls to close the ventilation module 400 and the second detection module 200.

[0080] According to a preferred embodiment, the regulating module 300 generates a time-varying curve of the plant producing liquid beads according to the detection results of the first detection module 100 and the second detection module 200. According to the law of the time-varying curve of the plant producing liquid beads, the regulating module 300 automatically selects different modes to ventilate the cultivation environment.

[0081] Example 3

[0082] This embodiment is a further improvement of Example 1, and the repeated contents will not be described again.

[0083] This embodiment provides a hydroponic system 600 to illustrate the working process of the system taking hydroponic lettuce as an example.

[0084] As shown in Figure 2 , the system includes a cultivation tank 610 for cultivating lettuce. A nutrient supply pool 620 containing nutrient solution is arranged below the cultivation tank 610. Preferably, the nutrient supply pool 620 is connected with the cultivation tank 610 through a pipeline assembly 630. Preferably, the pipeline assembly 630 includes a pipeline and a pump 631. Preferably, the pipeline includes an inlet pipe and a recovery pipe. Preferably, one end of the inlet pipe is provided with the pump 631. The pump 631 is immersed in the nutrient solution. The opposite end of the inlet pipe is in communication with the cultivation tank 610. One end of the recovery pipe is in communication with the nutrient supply pool 620. The other end of the recovery pipe is in communication with the cultivation tank 610. The pump 631 can pump the nutrient solution in the nutrient supply pool 620 into the inlet pipe. The nutrient solution enters the cultivation tank 610 to provide nutrients for the lettuce. Preferably, the hydroponic method of this embodiment is a flowing cultivation method. Preferably, the regulating module 300 is in communication connection with the pump 631. Preferably, the regulating module 300 is in Bluetooth connection with the pump 631. The regulating module 300 can control the pumping amount or pumping speed of the pump 631. The nutrient solution enters from the inlet pipe and is discharged from the recovery pipe, and returns to the nutrient supply pool 620.

[0085] When the first detection module 100 detects the presence of liquid beads on the leaves of the plant, the control module 300 controls the second detection module 200 to start working to detect the sap flow of the cultivated plant. Preferably, the physiological information of the cultivated plant detected by the second detection module 200 is the sap flow flux or the sap flow rate, so as to determine the water absorption condition of the plant roots. Preferably, the preset range of the sap flow flux is set to 40-100 g / (cm 2 ·h). The upper limit of the preset range is 100 g / (cm 2 ·h), and the lower limit of the preset range is 40 g / (cm 2 ·h).

[0086] The control module 300 is configured to dehumidify the space where the underground part of the plant is located in the first mode when the sap flow flux exceeds the upper limit of the preset range, wherein the preset range refers to the change range of the sap flow and / or photosynthetic rate of the plant under suitable environmental conditions. The absorption activity of the plant roots is vigorous, and the control module 300 reduces the pumping amount or pumping speed of the pump 631. For example, for a cultivation tank 610 with a length of 20 m and a width of 50 cm, the pumping speed of the pump 631 is reduced from the original 6 L / min to 4 L / min, so as to reduce the liquid level of the nutrient solution and reduce the contact area between the plant roots and the nutrient solution, thereby reducing the transpiration amount.

[0087] Preferably, the second detection module 200 can be a plant sap flow meter. Preferably, the second detection module 200 can be a sap flow sensor.

[0088] The control module 300 is configured to dehumidify the space where the aboveground part of the plant is located in the second mode when the sap flow is in the preset range. The second mode refers to dehumidifying the cultivation environment by simultaneously performing low air speed ventilation and low heating capacity. Preferably, the ventilation air speed is set to 0.3-0.5 m / s, and the heating capacity is set to 30-50 kW.

[0089] Preferably, the control module 300 is configured to dehumidify the space where the aboveground part of the plant is located in the third mode when the sap flow is lower than the lower limit of the preset range. Preferably, the third mode refers to dehumidifying the space where the aboveground part of the plant is located by alternately performing ventilation and heating. Preferably, the third mode refers to dehumidifying the cultivation environment by alternately performing high air speed ventilation and high heating capacity. Preferably, the ventilation air speed is set to 1-2 m / s, and the heating capacity is set to 100-500 kW.

[0090] Embodiment 4

[0091] This embodiment is a further improvement of embodiment 3, and the repeated contents will not be described again.

[0092] For example, in the case of a hydroponic system, the nutrient supply tank 620 is connected to the cultivation tank 610 by a pipe assembly 630. Preferably, the pipe assembly 630 comprises a pipe and a pump 631. Preferably, the pipe is arranged in the cultivation tank 610 in the direction of extension of the cultivation tank 610. Preferably, the pipe is provided with a spray head. The pump 631 pumps the nutrient solution into the pipe, and the nutrient solution is sprayed by the spray head to provide nutrients for the plants. Preferably, the control module 300 can control the intermittent time and the pumping amount of the pump 631, thereby controlling the spraying frequency and the spraying amount of the spray head.

[0093] When the stem flow of the plants exceeds the upper limit of the preset range, it indicates that the absorption activity of the roots of the plants is vigorous, and the control module 300 increases the intermittent time or the pumping amount of the pump 631. For example, the pump 631 is managed in the following manner: supplying liquid for 20 minutes and stopping for 30 minutes. Due to the vigorous absorption activity of the roots, the management manner of the pump 631 is changed to supplying liquid for 20 minutes and stopping for 50 minutes, or supplying liquid for 10 minutes and stopping for 30 minutes, and so on. The plants are supplied with nutrients in this way, which can ensure that the plants absorb a normal amount of nutrients, and can also reduce the excessive absorption activity of the roots of the plants, thereby reducing the transpiration amount and reducing the formation of liquid beads on the leaves.

[0094] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and not constitute a limitation on the claims. The protection scope of the present application is defined by the claims and their equivalents. The specification of the present application contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment", or "optionally", which all indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application according to each inventive concept. Throughout the text, the features introduced by "preferably" are only optional ways, and should not be understood as necessarily provided, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A detection system for plant cultivation, characterized by, The application relates to a plant moisture control system, comprising: a first detection module (100) configured to acquire leaf surface information of a plant, a second detection module (200) configured to acquire physiological information of the plant, and a control module (300) in communication connection with the first detection module (100) and the second detection module (200), configured to adjust humidity of a space where an underground part or an aboveground part of the plant is located based on the leaf surface information of the plant acquired by the first detection module (100) and the physiological information for judging a root water absorption condition of the plant acquired by the second detection module (200), and the control module (300) is configured to control the second detection module (200) to acquire the physiological information of the plant when the leaf surface information acquired by the first detection module (100) is information that liquid beads are generated on the leaf surface.

2. The system of claim 1, wherein, The physiological information comprises stem flow, transpiration amount and photosynthetic rate of the plant.

3. The system of claim 2, wherein, The control module (300) is configured to dehumidify the space where the underground part of the plant is located in a first mode when the stem flow and / or the photosynthetic rate exceeds an upper limit of a preset range, wherein The preset range refers to a variation range of the stem flow and / or the photosynthetic rate of the plant under suitable environmental conditions.

4. The system of claim 3, wherein, The first mode refers to ventilating the root of the plant and / or lowering the height of a liquid surface in contact with the root of the plant.

5. The system of claim 2, wherein, The control module (300) is configured to dehumidify the space where the aboveground part of the plant is located in a second mode when the stem flow and / or the photosynthetic rate is in the preset range.

6. The system of claim 5, wherein, The second mode refers to simultaneously ventilating and heating the space where the aboveground part of the plant is located.

7. The system of claim 2, wherein, The control module (300) is configured to dehumidify the space where the aboveground part of the plant is located in a third mode when the stem flow and / or the photosynthetic rate is lower than a lower limit of the preset range.

8. The system of claim 7, wherein, The third mode refers to dehumidifying the space where the aboveground part of the plant is located in a mode that ventilation and heating are alternately performed.

9. The system of claim 8, wherein, The ventilation wind speed of the third mode is greater than that of the second mode, and the heating amount of the third mode is greater than that of the second mode.

10. A detection method for plant breeding, characterized by, The application further relates to a plant moisture control method, comprising the following steps: acquiring leaf surface information of a plant; acquiring physiological information for judging a root water absorption condition of the plant; adjusting humidity of a space where an underground part or an aboveground part of the plant is located based on the leaf surface information and the physiological information of the plant; and acquiring the physiological information of the plant when the acquired leaf surface information is information that liquid beads are generated on the leaf surface.

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