Fertilizing method and system for improving CO2 absorption efficiency of greenhouse plants based on SPAC system

Abstract

The invention discloses a fertilization method and system for improving CO2 absorption efficiency of greenhouse plants based on an SPAC system. The method comprises the following steps: acquiring moisture information and environment information of the greenhouse plants through a biological environment information acquisition module deployed in a greenhouse; according to the obtained moisture information and environment information, the current leaf water potential and the saturation vapor pressure difference are calculated; calculating the stomatal conductance of the plant by combining the soil water potential and the atmospheric pressure according to the calculated current leaf water potential and saturation vapor pressure difference; and regulating and controlling water and CO2 fertilization of the greenhouse plants according to the stomatal conductance of the plants. By means of the method, under the condition that the evaporation intensity is too high, plant water stress can be weakened, stomatal opening is promoted, stomatal conductivity and mesophyll conductivity are improved, CO2 absorption and utilization are promoted, the photosynthesis efficiency of greenhouse fruits and vegetables can be effectively improved, and plant growth and yield formation are promoted.

Description

Technical Field

[0001] This invention relates to the field of facility horticulture technology, specifically to a fertilization method and system based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants. Background Technology

[0002] Greenhouses are an important source of fruit and vegetable production in my country. Currently, global atmospheric CO2 concentrations are continuously rising, and CO2 fertilization technology has been gradually applied in facility agriculture. However, its utilization efficiency and yield-increasing effect as a gaseous fertilizer are still not ideal, and the yield potential of facility-grown fruits and vegetables has not been fully explored. Under conditions where temperature and supplemental lighting can provide sufficient energy and assimilative capacity for photosynthetic carboxylation reactions, improving the absorption and transport capacity of CO2 from its source (atmosphere) to its sink (chloroplasts) becomes an important way to tap the photosynthetic and yield potential of plants.

[0003] In the soil-plant-atmosphere continuum (SPAC system), a water potential gradient exists from the soil to the plant leaves, with the water potential gradually decreasing. This water potential difference creates the driving force for water flow, allowing water to escape into the atmosphere against gravity without the need for metabolic pumps or energy consumption. Based on the SPAC system theory, when plants are under water stress, stomatal conductance decreases, and the resistance of leaf stomata and mesophyll becomes too high. This results in low efficiency of CO2 transport from the atmosphere through stomata to the chloroplast carboxylation sites for absorption and utilization, leading to a lower effect of CO2 fertilization on photosynthesis and yield enhancement.

[0004] Therefore, how to coordinate and regulate the water and CO2 supply of greenhouse crops is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, this application proposes the following technical solution: In a first aspect, embodiments of this application provide a fertilization method based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants, including: The biological environment information acquisition module deployed inside the greenhouse is used to acquire water and environmental information of the greenhouse plants. The current leaf water potential and saturated vapor pressure difference are calculated based on the obtained moisture and environmental information. The stomatal conductance of the plant is calculated based on the current leaf water potential and saturated vapor pressure difference, combined with soil water potential and atmospheric pressure. The water and CO2 fertilization of greenhouse plants can be regulated based on the stomatal conductance of the plants.

[0006] In one possible implementation, the acquisition of moisture and environmental information of greenhouse plants through a biological environment information acquisition module deployed inside the greenhouse includes: The soil water potential and soil volumetric water content in the root zone of the plant were obtained using a soil water potential sensor and a soil moisture content sensor, respectively. The air temperature and relative humidity inside the greenhouse are obtained using an air temperature and humidity sensor.

[0007] In one possible implementation, the formula for calculating the current blade water potential is: in, , , , These are regression parameters between leaf water potential and environmental parameters. For air temperature, This refers to the relative humidity of the air. This refers to the soil volumetric water content.

[0008] In one possible implementation, the formula for calculating the saturated water vapor pressure difference is: in, The saturated water vapor pressure For air temperature, This refers to the relative humidity of the air.

[0009] In one possible implementation, the formula for calculating the stomatal conductance of the plant based on the calculated current leaf water potential, saturated vapor pressure difference, soil water potential, and atmospheric pressure is as follows: in, The current water potential of the blade, For soil water potential, For saturated water vapor pressure difference, Atmospheric pressure. The maximum system hydraulic conductivity under conditions of sufficient water supply and no blockage. For a water potential with a 50% loss in hydraulic conductivity, The shape parameters of the fragility curve, As a basis for plant hydraulic conductivity The established specific model.

[0010] In one possible implementation, the regulation of water and CO2 fertilization of greenhouse plants based on stomatal conductance includes: The calculated stomatal conductance of the plant is compared with the preset stomatal conductance. When the calculated stomatal conductance of the plant is greater than or equal to the preset stomatal conductance, the CO2 fertilization module is immediately activated to increase the CO2 concentration in the greenhouse to the preset target value. Alternatively, when the calculated stomatal conductance of the plant is less than the preset stomatal conductance, the causes of water deficit in the plant are judged based on the soil water potential and air saturation vapor pressure difference in the greenhouse, and the plant is regulated according to the judged water deficit. After the adjustment is completed, the CO2 fertilization module is activated to increase the CO2 concentration in the greenhouse to the preset target value.

[0011] In one possible implementation, based on the soil water potential and the air saturation vapor pressure difference within the greenhouse, the causes of water deficit in the plants are determined, and then the plants are regulated according to the determined water deficit, including: When the soil water potential in the greenhouse is lower than the preset soil water potential and the air saturation water vapor pressure difference is greater than the preset value, soil irrigation is given priority until the soil water potential in the greenhouse is greater than the preset soil water potential. When the soil water potential in the greenhouse is greater than or equal to the preset soil water potential and the air saturated water vapor pressure difference is less than the preset value, air cooling and humidification are performed until the air saturated water vapor pressure difference is greater than the preset value. When the soil water potential in the greenhouse is lower than the preset soil water potential and the air saturated water vapor pressure difference is lower than the preset water vapor pressure value, soil irrigation and air cooling and humidification are carried out simultaneously until the soil water potential and air saturated water vapor pressure difference in the greenhouse are within the normal range.

[0012] Secondly, embodiments of this application provide a fertilization system based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants, including: The biological environment information acquisition module is used to acquire water and environmental information of greenhouse plants; The NB-IoT wireless communication module is used to transmit the acquired real-time greenhouse environmental monitoring information to the greenhouse analysis and decision-making module; The greenhouse analysis and decision-making module is used to analyze and calculate the plant's water status and stomatal conductance based on real-time greenhouse environmental monitoring information, and at the same time send control commands to the greenhouse environmental control module. The greenhouse environment control module is used to regulate the water and CO2 fertilization of greenhouse plants according to control instructions.

[0013] Compared with the prior art, the beneficial effects of this application are as follows: The method adopted in this application can be automatically adjusted. Based on the environmental information of greenhouse plant growth, the current water status of the plant is judged, and feedback control is carried out according to the plant water status and drought inducing factors. The plant water and CO2 fertilization are coordinated and regulated to maintain the dynamic balance of "root water absorption - plant water transport - atmospheric evaporation demand", so that the plant has a large stomatal opening and improves the yield increase effect of CO2 fertilization.

[0014] The method used in this application can reduce plant water stress and promote stomatal opening under conditions of excessively high evaporation intensity, improve stomatal conductance and mesophyll conductance, and promote CO2 absorption and utilization. This can effectively improve the photosynthetic efficiency of greenhouse fruits and vegetables, and promote plant growth and yield formation. Attached Figure Description

[0015] Figure 1 A schematic flowchart illustrating a fertilization method for improving CO2 absorption efficiency of greenhouse plants based on a SPAC system, provided in this application embodiment; Figure 2 This is a schematic diagram of a fertilization system based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants, provided as an embodiment of this application. Detailed Implementation

[0016] The present solution will now be described in conjunction with the accompanying drawings and specific embodiments.

[0017] Figure 1 A schematic flowchart illustrating a fertilization method based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants, provided in this application embodiment, is shown below. Figure 1 This embodiment of a fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on a SPAC system includes: S101 acquires water and environmental information of greenhouse plants through a biological environment information acquisition module deployed inside the greenhouse.

[0018] In this embodiment, air temperature and humidity sensors, CO2 concentration sensors, soil moisture sensors, and soil water potential sensors are arranged at selected locations in the greenhouse. The soil water potential sensor and soil moisture sensor are used to acquire the soil water potential and soil volumetric water content in the root zone of the plant, respectively. The air temperature and relative humidity sensors are used to acquire the air temperature and relative humidity in the greenhouse. Real-time data is acquired every 1 minute.

[0019] S102 calculates the current leaf water potential and saturated vapor pressure difference based on the acquired moisture and environmental information.

[0020] In this embodiment, the formula for calculating the current blade water potential is: in, , , , These are regression parameters between leaf water potential and environmental parameters. For air temperature, This refers to the relative humidity of the air. This refers to the soil volumetric water content.

[0021] The formula for calculating the saturated water vapor pressure difference is: in, The saturated water vapor pressure For air temperature, This refers to the relative humidity of the air.

[0022] S103 calculates the stomatal conductance of the plant based on the calculated current leaf water potential, saturated vapor pressure difference, soil water potential, and atmospheric pressure.

[0023] In this embodiment, the formula for calculating the stomatal conductance of the plant based on the calculated current leaf water potential, saturated vapor pressure difference, soil water potential, and atmospheric pressure is as follows: The plant hydraulic conductance is fitted based on a vulnerability curve of the plant leaf water potential, and the calculation formula is as follows: in, The current water potential of the blade, For soil water potential, For saturated water vapor pressure difference, Atmospheric pressure. The maximum system hydraulic conductivity under conditions of sufficient water supply and no blockage. For a water potential with a 50% loss in hydraulic conductivity, The shape parameters of the fragility curve, As a basis for plant hydraulic conductivity The established specific model.

[0024] S104 regulates water and CO2 fertilization of greenhouse plants based on the stomatal conductance of the plants.

[0025] In this embodiment, the calculated stomatal conductance of the plant is compared with the preset stomatal conductance. When the calculated stomatal conductance of the plant is greater than or equal to the preset stomatal conductance, it indicates that the plant's water status is suitable and the water supply and demand are balanced. The CO2 fertilization module is immediately activated to increase the CO2 concentration in the greenhouse to the preset target value.

[0026] When the calculated stomatal conductance of the plant is less than the preset stomatal conductance, the stomatal resistance is too high, indicating that the plant is under water stress. Based on the soil water potential and air saturation vapor pressure difference in the greenhouse, the causes of plant water deficit are judged and the plant is regulated according to the judged water deficit. After the plant water is restored to a normal state, the CO2 fertilization module is activated to increase the CO2 concentration in the greenhouse to the preset target value.

[0027] In this embodiment, when the stomatal conductance decreases below the critical value due to plant water deficit, water regulation of greenhouse plants is initiated. Based on the soil water potential and air saturated vapor pressure difference in the greenhouse, the cause of plant water deficit is determined. When the soil water potential in the greenhouse is less than the preset soil water potential and the air saturated vapor pressure difference is greater than the preset value, it is determined that the soil is dry, and soil irrigation is performed first until the soil water potential in the greenhouse is greater than the preset soil water potential.

[0028] When the soil water potential inside the greenhouse is greater than or equal to the preset soil water potential and the air saturated vapor pressure difference is less than the preset value, it is determined that the air saturated vapor pressure difference is too low. In this case, air cooling and humidification are implemented until the air saturated vapor pressure difference is greater than the preset value. When the soil water potential inside the greenhouse is less than the preset soil water potential and the air saturated vapor pressure difference is less than the preset vapor pressure value, soil irrigation and air cooling and humidification are implemented simultaneously until the soil water potential and air saturated vapor pressure difference inside the greenhouse are within the normal range.

[0029] Corresponding to the above embodiment of a fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on a SPAC system, this application also provides an embodiment of a fertilization system for improving the CO2 absorption efficiency of greenhouse plants based on a SPAC system.

[0030] See Figure 2 This application provides a fertilization system 20 based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants, comprising: The biological environment information acquisition module 201 is used to acquire water and environmental information of greenhouse plants; The NB-IoT wireless communication module 202 is used to transmit the acquired real-time greenhouse environmental monitoring information to the greenhouse analysis and decision-making module; The greenhouse analysis and decision-making module 203 is used to analyze and calculate the plant's water status and stomatal conductance based on real-time greenhouse environmental monitoring information, and at the same time send control instructions to the greenhouse environmental control module. The greenhouse environment control module 204 is used to regulate the water and CO2 fertilization of greenhouse plants according to control instructions.

[0031] In this embodiment, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0032] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A fertilization method based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants, characterized in that, include: The biological environment information acquisition module deployed inside the greenhouse is used to acquire water and environmental information of the greenhouse plants. The current leaf water potential and saturated vapor pressure difference are calculated based on the obtained moisture and environmental information. The stomatal conductance of the plant is calculated based on the current leaf water potential and saturated vapor pressure difference, combined with soil water potential and atmospheric pressure. The water and CO2 fertilization of greenhouse plants can be regulated based on the stomatal conductance of the plants.

2. The fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on the SPAC system according to claim 1, characterized in that, The process of acquiring moisture and environmental information of greenhouse plants through a biological environment information acquisition module deployed inside the greenhouse includes: The soil water potential and soil volumetric water content in the root zone of the plant were obtained using a soil water potential sensor and a soil moisture content sensor, respectively. The air temperature and relative humidity inside the greenhouse are obtained using an air temperature and humidity sensor.

3. The fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on the SPAC system according to claim 1, characterized in that, The formula for calculating the current blade water potential is: in, , , , These are regression parameters between leaf water potential and environmental parameters. For air temperature, This refers to the relative humidity of the air. This refers to the soil volumetric water content.

4. The fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on the SPAC system according to claim 1, characterized in that, The formula for calculating the saturated water vapor pressure difference is: in, The saturated water vapor pressure For air temperature, This refers to the relative humidity of the air.

5. The fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on the SPAC system according to claim 1, characterized in that, The formula for calculating the stomatal conductance of a plant based on the calculated current leaf water potential, saturated vapor pressure difference, soil water potential, and atmospheric pressure is as follows: in, The current water potential of the blade, For soil water potential, For saturated water vapor pressure difference, Atmospheric pressure. The maximum system hydraulic conductivity under conditions of sufficient water supply and no blockage. For a water potential with a 50% loss in hydraulic conductivity, The shape parameters of the fragility curve, As a basis for plant hydraulic conductivity The established specific model.

6. The fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on the SPAC system according to claim 1, characterized in that, The method of regulating water and CO2 fertilization of greenhouse plants based on stomatal conductance includes: The calculated stomatal conductance of the plant is compared with the preset stomatal conductance. When the calculated stomatal conductance of the plant is greater than or equal to the preset stomatal conductance, the CO2 fertilization module is immediately activated to increase the CO2 concentration in the greenhouse to the preset target value. Alternatively, when the calculated stomatal conductance of the plant is less than the preset stomatal conductance, the causes of water deficit in the plant are judged based on the soil water potential and air saturated water vapor pressure difference in the greenhouse, and the plant is regulated according to the judged water deficit. After the adjustment is completed, the CO2 fertilization module is activated to increase the CO2 concentration in the greenhouse to the preset target value.

7. The fertilization method for improving the CO2 absorption efficiency of greenhouse plants based on the SPAC system according to claim 6, characterized in that, Based on the soil water potential and air saturation vapor pressure difference within the greenhouse, the causes of water deficit in the plants are determined, and then the plants are regulated accordingly, including: When the soil water potential in the greenhouse is lower than the preset soil water potential and the air saturation water vapor pressure difference is greater than the preset value, soil irrigation is given priority until the soil water potential in the greenhouse is greater than the preset soil water potential. When the soil water potential in the greenhouse is greater than or equal to the preset soil water potential and the air saturated water vapor pressure difference is less than the preset value, air cooling and humidification are performed until the air saturated water vapor pressure difference is greater than the preset value. When the soil water potential in the greenhouse is lower than the preset soil water potential and the air saturated water vapor pressure difference is lower than the preset water vapor pressure value, soil irrigation and air cooling and humidification are carried out simultaneously until the soil water potential and air saturated water vapor pressure difference in the greenhouse are within the normal range.

8. A fertilization system based on a SPAC system to improve the CO2 absorption efficiency of greenhouse plants, characterized in that, include: The biological environment information acquisition module is used to acquire water and environmental information of greenhouse plants; The NB-IoT wireless communication module is used to transmit the acquired real-time greenhouse environmental monitoring information to the greenhouse analysis and decision-making module; The greenhouse analysis and decision-making module is used to analyze and calculate the plant's water status and stomatal conductance based on real-time greenhouse environmental monitoring information, and at the same time send control commands to the greenhouse environmental control module. The greenhouse environment control module is used to regulate the water and CO2 fertilization of greenhouse plants according to control instructions.

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