Eucommia ulmoides micro-spraying control method and system based on photosynthetically active radiation

Abstract

The invention discloses a photosynthetically active radiation-based eucommia ulmoides micro-spraying control method and system, and the method comprises the steps: obtaining PAR data and soil temperature data, and judging whether the mean value of the PAR data in continuous preset duration is greater than or equal to a PAR data control threshold value or not; if yes, a canopy micro-spraying system is started, and micro-spraying cooling is conducted on the plants according to the preset initial micro-spraying duration; according to the intensity change of the PAR data, the actual micro-spraying duration is dynamically adjusted, and every time a preset PAR data change value is increased by a PAR data mean value in continuous preset duration, the initial micro-spraying duration is increased by a preset prolonged duration to serve as the actual micro-spraying duration; judging whether the soil temperature data is greater than or equal to a soil temperature control threshold; if yes, a root drip irrigation system is started, drip irrigation cooling is conducted on the plants according to the preset drip irrigation duration, and the photosynthetic efficiency of eucommia ulmoides and the water resource utilization rate are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural irrigation, and particularly to a Eucommia micro-spray control method and system based on photosynthetically active radiation. Background Art

[0002] Photosynthetically Active Radiation (PAR) refers to the visible light band that can be absorbed and utilized by chlorophyll in plant photosynthesis, and its intensity directly affects the photosynthetic efficiency and physiological metabolism process of plants. As an important economic forest tree, Eucommia ulmoides is highly sensitive to environmental factors such as light, water, and temperature during its growth process. Especially under the conditions of high temperature and strong light in summer, canopy photoinhibition and root zone heat stress frequently occur, and it is urgent to improve its growth environment through precise irrigation regulation.

[0003] Traditional agricultural irrigation technologies mostly rely on single parameters such as air temperature or soil humidity to control irrigation systems. For example, the spray cooling is triggered by setting a temperature threshold, or the drip irrigation water volume is controlled based on the soil water content threshold. However, such methods do not fully consider the dynamic impact of photosynthetically active radiation on plant photosynthesis, resulting in the difficulty of the existing irrigation strategies to achieve the coordinated optimization of light-water-temperature parameters in the scenes of strong light and high temperature. Therefore, how to construct a precise regulation method coupling light-water-temperature based on the dynamic change of photosynthetically active radiation has become a key technical problem for improving the photosynthetic efficiency and water-saving benefit of Eucommia ulmoides. Summary of the Invention

[0004] The present invention provides a Eucommia micro-spray control method and system based on photosynthetically active radiation to solve the problem that the existing irrigation strategies are difficult to achieve the coordinated optimization of light-water-temperature parameters.

[0005] In a first aspect, the present invention provides a Eucommia micro-spray control method based on photosynthetically active radiation, including:

[0006] Step S1, obtaining the PAR data collected in real time by a photosynthetically active radiation sensor and the soil temperature data collected in real time by a soil temperature sensor, wherein the photosynthetically active radiation sensor is deployed in the Eucommia ulmoides canopy of the plant, and the soil temperature sensor is deployed in the soil layer where the plant is located;

[0007] Step S2, judging whether the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold;

[0008] Step S3, if the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold, starting the canopy micro-spray system and performing micro-spray cooling on the plant according to the preset initial micro-spray duration;

[0009] Step S4: Dynamically adjust the actual micro-spraying duration according to the intensity change of PAR data. For every increase of the preset PAR data change value in the average value of PAR data within a continuous preset duration, add a preset extended duration to the initial micro-spraying duration as the actual micro-spraying duration.

[0010] Step S5: Determine whether the soil temperature data is greater than or equal to the soil temperature control threshold.

[0011] Step S6: If the soil temperature data is greater than or equal to the soil temperature control threshold, activate the root drip irrigation system and irrigate the plant for the preset drip irrigation duration to cool it down.

[0012] Further, in step S2, the continuous preset duration is 5 minutes, and the PAR data control threshold is 800 μmol / m 2 / s.

[0013] Further, in step S3, the preset initial micro-spraying duration is 5 minutes.

[0014] Further, step S3 also includes: when the average value of PAR data within a continuous preset duration drops below the preset PAR data hysteresis release threshold and lasts for the preset falling duration, turn off the canopy micro-spraying system.

[0015] Further, the preset PAR data hysteresis release threshold is 700 μmol / m 2 / s, and the preset falling duration is 10 minutes.

[0016] Further, in step S4, the preset PAR data change value is 100 μmol / m 2 / s, and the preset extended duration is 2 minutes.

[0017] Further, in step S5, the soil temperature control threshold is 28 °C.

[0018] Further, the soil temperature sensor is deployed in the soil layer at a depth of 10 cm in the soil layer where the plant is located.

[0019] Further, in step S6, the preset drip irrigation duration is 30 minutes.

[0020] In a second aspect, the present invention provides a Eucommia ulmoides micro-spraying control system based on photosynthetically active radiation, including: a photosynthetically active radiation sensor, a soil temperature sensor, a data analysis processor, and an actuator. The photosynthetically active radiation sensor and the soil temperature sensor are respectively connected to the data analysis processor, and the data analysis processor is connected to the actuator; the photosynthetically active radiation sensor is deployed in the Eucommia ulmoides canopy of the plant, and the soil temperature sensor is deployed in the soil layer where the plant is located;

[0021] The photosynthetically active radiation sensor is used to collect PAR data of the canopy of Eucommia ulmoides plants in real time;

[0022] The soil temperature sensor is used to collect soil temperature data of the soil layer where the plants are located in real time;

[0023] The data analysis processor is used to obtain the PAR data collected in real time by the photosynthetically active radiation sensor and the soil temperature data collected in real time by the soil temperature sensor; determine whether the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold; if the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold, start the canopy micro-spraying system and perform micro-spraying cooling on the plants according to the preset initial micro-spraying duration; dynamically adjust the actual micro-spraying duration according to the intensity change of the PAR data, and for every increase of the preset PAR data change value in the average value of the PAR data within a continuous preset duration, increase the initial micro-spraying duration by the preset extended duration as the actual micro-spraying duration; determine whether the soil temperature data is greater than or equal to the soil temperature control threshold; if the soil temperature data is greater than or equal to the soil temperature control threshold, start the root drip irrigation system and perform drip irrigation cooling on the plants;

[0024] The actuator is used to receive the control signal of the data analysis processor and start or close the canopy micro-spraying system and start or close the root drip irrigation system.

[0025] The present invention has the following beneficial effects: The Eucommia ulmoides micro-spraying control method and system based on photosynthetically active radiation of the present invention use PAR data as the core parameter for Eucommia ulmoides irrigation control, breaking through the single-dimensional control that only depends on air / soil temperature in the prior art; establishing a dynamic mathematical model between PAR intensity and spraying duration to avoid the waste of resources in the fixed-duration irrigation in the prior art; setting a PAR fallback buffer interval to prevent frequent start and stop, and avoiding root zone heat stress through coordinated control of soil temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a flowchart of the Eucommia ulmoides micro-spraying control method based on photosynthetically active radiation of the present invention;

[0028] Figure 2 It is a schematic diagram of the Eucommia ulmoides micro-spraying control system based on photosynthetically active radiation of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the drawings.

[0030] Please refer to Figure 1 , an embodiment of the present invention provides a Eucommia micro-spray control method based on photosynthetically active radiation, including:

[0031] Step S1, obtaining the PAR data collected in real time by a photosynthetically active radiation sensor and the soil temperature data collected in real time by a soil temperature sensor, wherein the photosynthetically active radiation sensor is deployed in the Eucommia ulmoides canopy of the plant, and the soil temperature sensor is deployed in the soil layer where the plant is located.

[0032] In this embodiment, the soil temperature sensor is deployed in the soil layer at a depth of 10 cm in the soil layer where the plant is located.

[0033] Step S2, determining whether the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold.

[0034] In this embodiment, the continuous preset duration is 5 minutes, and the PAR data control threshold is 800 μmol / m 2 / s.

[0035] Step S3, if the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold, start the canopy micro-spray system, and perform micro-spray cooling on the plant according to a preset initial micro-spray duration.

[0036] In this embodiment, the preset initial micro-spray duration is 5 minutes. When the average value of the PAR data for 5 consecutive minutes ≥ 800 μmol / m 2 / s, start the canopy micro-spray system and perform micro-spray cooling on the plant for 5 minutes.

[0037] In addition, a hysteresis release mechanism can be set. When the average value of the PAR data drops below 700 μmol / m 2 / s and lasts for 10 minutes, turn off the canopy micro-spray system, and prevent frequent start and stop by setting a PAR fallback buffer range of 700 - 800 μmol / m 2 / s.

[0038] Step S4: Dynamically adjust the actual micro-spraying duration according to the intensity change of PAR data. For every increase of the preset PAR data change value in the average value of PAR data within a continuous preset duration, increase the initial micro-spraying duration by a preset extended duration as the actual micro-spraying duration.

[0039] In this embodiment, the preset PAR data change value is 100 μmol / m 2 / s, and the preset extended duration is 2 minutes. For every increase of 100 μmol / m 2 / s in the average value of PAR data within 5 minutes, the actual micro-spraying duration increases by 2 minutes. The maximum actual micro-spraying duration is 15 min to prevent waterlogging on the leaf area.

[0040] Step S5: Determine whether the soil temperature data is greater than or equal to the soil temperature control threshold.

[0041] In this embodiment, the soil temperature control threshold is 28 °C.

[0042] Step S6: If the soil temperature data is greater than or equal to the soil temperature control threshold, start the root drip irrigation system and irrigate the plant for a preset drip irrigation duration to cool it down.

[0043] In this embodiment, the preset drip irrigation duration is 30 minutes. When the temperature of the soil layer at a depth of 10 cm ≥ 28 °C, start the root drip irrigation system to irrigate and cool the plant for 30 minutes, and the soil temperature is synergistically controlled to avoid root zone heat stress.

[0044] By conducting an experimental comparison between the Eucommia ulmoides micro-spraying control method based on photosynthetically active radiation of the present invention and the traditional temperature control method, the following comparison table of index data is obtained. It can be seen that by adopting the method of the present invention, the photosynthetic efficiency and water resource utilization rate of Eucommia ulmoides are significantly improved.

[0045] Table 1 Comparison table of index data obtained from the experimental comparison between the Eucommia ulmoides micro-spraying control method based on photosynthetically active radiation of the present invention and the traditional temperature control method

[0046] Index Traditional temperature control The solution of the present invention Net photosynthetic rate <![CDATA[8.2μmol / m 2 / s]]> <![CDATA[9.8μmol / m 2 / s]]> Stomatal conductance <![CDATA[0.15mol / m 2 / s]]> <![CDATA[0.21mol / m 2 / s]]> Irrigation water volume <![CDATA[450m 3 / mu]]> <![CDATA[320m 3 / mu]]>

[0047] Please refer to Figure 2 , the embodiment of the present invention provides a Eucommia ulmoides micro-spraying control system based on photosynthetically active radiation, including: a photosynthetically active radiation sensor, a soil temperature sensor, a data analysis processor, and an actuator. The photosynthetically active radiation sensor and the soil temperature sensor are respectively connected to the data analysis processor, and the data analysis processor is connected to the actuator; the photosynthetically active radiation sensor is deployed in the Eucommia ulmoides canopy of the plant, and the soil temperature sensor is deployed in the soil layer where the plant is located.

[0048] Photosynthetically Active Radiation (PAR) sensor, which is used to collect PAR data of the canopy of Eucommia ulmoides Oliv. in real time. The PAR sensor adopts the Apogee SQ-520 type PAR sensor, with a measurement range of 0 - 3000 μmol / m 2 / s. The installation height is 30 cm from the top of the Eucommia ulmoides Oliv. canopy, and the sampling frequency is 1 time per minute.

[0049] Soil temperature sensor, which is used to collect soil temperature data of the soil layer where the plant is located in real time. The soil temperature sensor adopts Decagon5TM.

[0050] The data analysis processor adopts a PLC, Siemens S7-1200, which is used to obtain the PAR data collected in real time by the PAR sensor and the soil temperature data collected in real time by the soil temperature sensor; judge whether the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold; if the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold, start the canopy micro-spraying system and spray the plants for cooling according to the preset initial micro-spraying duration; dynamically adjust the actual micro-spraying duration according to the intensity change of the PAR data. For every increase of the preset PAR data change value in the average value of the PAR data within a continuous preset duration, increase the initial micro-spraying duration by the preset extended duration as the actual micro-spraying duration; judge whether the soil temperature data is greater than or equal to the soil temperature control threshold; if the soil temperature data is greater than or equal to the soil temperature control threshold, start the root drip irrigation system and carry out drip irrigation cooling for the plants.

[0051] The data analysis processor executes a light-temperature coupling algorithm, which satisfies the following relational expression:

[0052]

[0053] Where: T spray represents the actual micro-spraying duration, unit: minute; PAR represents the average value of the 5-minute photosynthetically active radiation data.

[0054] The actuator is used to receive the control signal of the data analysis processor to start or stop the canopy micro-spraying system and start or stop the root drip irrigation system. The actuator includes the solenoid valve group and variable frequency water pump of the canopy micro-spraying system and the root drip irrigation system. The canopy micro-spraying system adopts a rotary atomizing nozzle, and the droplet size is controlled in the range of 100 - 200 μm. The canopy micro-spraying system is 30 cm from the plant canopy, with an inclination angle of 15°.

[0055] An embodiment of the present invention also provides a storage medium, in which a computer program is stored. When the computer program is executed by a processor, some or all of the steps in each embodiment of the method for controlling micro-spraying of Eucommia ulmoides based on photosynthetically active radiation provided by the present invention are implemented. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM for short), a random access memory (RAM for short), or the like.

[0056] Those skilled in the art can clearly understand that the technologies in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solutions in the embodiments of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments of the present invention.

[0057] The above-described embodiments of the present invention do not constitute a limitation on the protection scope of the present invention.

Claims

1. A control method for micro-spraying of Eucommia ulmoides based on photosynthetically active radiation, characterized in that, Including: Step S1: Obtain the PAR data collected in real time by a photosynthetically active radiation sensor and the soil temperature data collected in real time by a soil temperature sensor. Among them, the photosynthetically active radiation sensor is deployed in the Eucommia ulmoides canopy of the plant, and the soil temperature sensor is deployed in the soil layer where the plant is located; Step S2: Determine whether the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold; Step S3: If the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold, start the canopy micro-spraying system and perform micro-spraying cooling on the plant according to the preset initial micro-spraying duration; Step S4: Dynamically adjust the actual micro-spraying duration according to the intensity change of the PAR data. For every increase of the preset PAR data change value in the average value of the PAR data within a continuous preset duration, increase the preset extension duration to the initial micro-spraying duration as the actual micro-spraying duration; Step S5: Determine whether the soil temperature data is greater than or equal to the soil temperature control threshold; Step S6: If the soil temperature data is greater than or equal to the soil temperature control threshold, start the root drip irrigation system and perform drip irrigation cooling on the plant according to the preset drip irrigation duration.

2. The method for controlling the micro-spraying of Eucommia ulmoides based on photosynthetically active radiation according to claim 1, wherein, In step S2, the continuous preset duration is 5 minutes, and the PAR data control threshold is 800 μmol / m 2 / s.

3. The method for controlling micro-spraying of Eucommia ulmoides based on photosynthetically active radiation according to claim 1, wherein In step S3, the preset initial micro-spraying duration is 5 minutes.

4. The micro-spraying control method for Eucommia ulmoides based on photosynthetically active radiation according to claim 1, characterized in that, Step S3 further includes: When the average value of the PAR data within a continuous preset duration drops below the preset PAR data hysteresis release threshold and lasts for the preset drop duration, turn off the canopy micro-spraying system.

5. The micro-spraying control method for Eucommia ulmoides based on photosynthetically active radiation according to claim 4, wherein The preset PAR data lag release threshold is 700 μmol / m 2 / s, and the preset fallback duration is 10 minutes.

6. The method for controlling micro-spraying of Eucommia ulmoides based on photosynthetically active radiation according to claim 1, wherein In step S4, the preset PAR data change value is 100 μmol / m 2 / s, and the preset extended duration is 2 minutes.

7. The microspray control method for Eucommia ulmoides based on photosynthetically active radiation according to claim 1, characterized in that, In step S5, the soil temperature control threshold is 28°C.

8. The microspray control method of Eucommia ulmoides based on photosynthetically active radiation according to claim 1, wherein, The soil temperature sensor is deployed in the soil layer at a depth of 10 cm in the soil layer where the plant is located.

9. The microspray control method of Eucommia ulmoides based on photosynthetically active radiation according to claim 1, characterized in that, In step S6, the preset drip irrigation duration is 30 minutes.

10. A Eucommia micro-spray control system based on photosynthetically active radiation, characterized in that, Including: A photosynthetically active radiation sensor, a soil temperature sensor, a data analysis processor, and an actuator. The photosynthetically active radiation sensor and the soil temperature sensor are respectively connected to the data analysis processor, and the data analysis processor is connected to the actuator; the photosynthetically active radiation sensor is deployed in the Eucommia ulmoides canopy of the plant, and the soil temperature sensor is deployed in the soil layer where the plant is located; The photosynthetically active radiation sensor is used to collect the PAR data of the Eucommia ulmoides canopy of the plant in real time; The soil temperature sensor is used to collect the soil temperature data of the soil layer where the plant is located in real time; The data analysis processor is used to obtain the PAR data collected in real time by the photosynthetically active radiation sensor and the soil temperature data collected in real time by the soil temperature sensor; determine whether the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold; if the average value of the PAR data within a continuous preset duration is greater than or equal to the PAR data control threshold, start the canopy micro-spraying system and perform micro-spraying cooling on the plant according to the preset initial micro-spraying duration; dynamically adjust the actual micro-spraying duration according to the intensity change of the PAR data. For every increase of the preset PAR data change value in the average value of the PAR data within a continuous preset duration, increase the preset extension duration to the initial micro-spraying duration as the actual micro-spraying duration; Determine whether the soil temperature data is greater than or equal to the soil temperature control threshold; If the soil temperature data is greater than or equal to the soil temperature control threshold, start the root drip irrigation system to drip-irrigate and cool the plant; The actuator is configured to receive a control signal from the data analysis processor to start or stop the canopy micro-spray system and start or stop the root drip irrigation system.

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