Strawberry four-season planting system and method using artificial light source

Abstract

This invention relates to the field of planting technology, specifically disclosing a strawberry four-season planting system and method using artificial light sources, including the following steps: Step S1: Determine the current growth stage of the strawberry, obtain the target temperature range based on a preset growth temperature database, collect the current ambient temperature, and generate an allowable temperature rise margin value based on the difference between the two; Step S2: Obtain the electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameters of the planting area, calculate the maximum supplemental lighting duration based on the temperature rise margin, supplement light for this duration, then turn off the lights and enter an intermittent phase, the two constituting a supplemental lighting cycle; Step S3: During the intermittent phase, continuously monitor the ambient temperature. When the temperature drops to a preset lower threshold, terminate the intermittent phase and return to execute steps S1-S2 to start a new supplemental lighting cycle; This method, through dynamic cyclical regulation, avoids overheating due to supplemental lighting, ensures a suitable environment for strawberries at key stages, and achieves stable planting throughout the four seasons.

Description

Technical Field

[0001] This invention relates to the field of planting technology, specifically to a strawberry year-round planting system and method using artificial light sources. Background Technology

[0002] Strawberry cultivation throughout the year requires strict control over light, temperature, and humidity. The duration of light exposure must be precisely matched with temperature and humidity to ensure the quality of flower bud differentiation and fruit development. Especially during the critical period of flower bud differentiation, a low-temperature environment is necessary to induce flower bud formation.

[0003] However, existing artificial lighting technology has significant shortcomings. The light source generates a lot of heat during operation, which can easily disrupt the low-temperature conditions required for flower bud differentiation, leading to an imbalance between temperature and light. This not only inhibits the process of flower bud differentiation but also reduces the quality of flower buds, directly affecting the subsequent fruit setting rate and fruit quality. Summary of the Invention

[0004] The purpose of this invention is to provide a strawberry year-round planting system and method using artificial light sources, and to solve the following technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions: A method for growing strawberries year-round using artificial light, applied in enclosed growing areas, includes the following steps: Step S1: Determine the current growth stage of the strawberry plants in the closed planting area, obtain the target temperature range of the current growth stage based on the preset growth temperature database, and obtain the current ambient temperature in the closed planting area; obtain the temperature difference between the target temperature range and the current ambient temperature, and generate the allowable temperature rise margin value based on the temperature difference. Step S2: Obtain the electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameter of the enclosed planting area. Based on the electro-optical conversion heat loss power, volumetric heat capacity parameter, and allowable temperature rise margin, obtain the maximum supplementary lighting duration. Set the continuous supplementary lighting duration based on the maximum supplementary lighting duration. The artificial light source provides supplementary lighting within the continuous supplementary lighting duration. After the continuous supplementary lighting duration ends, the artificial light source is turned off, and a preset interval period is entered. The continuous supplementary lighting duration and the interval period constitute the supplementary lighting cycle. Step S3: During the intermittent period, continuously monitor the real-time ambient temperature in the enclosed planting area. When the real-time ambient temperature is detected to drop back to the preset lower limit threshold, terminate the intermittent period and return to execute steps S1 to S2 to enter a new supplemental lighting cycle.

[0006] As a further aspect of the present invention: the process of determining the current growth stage of the strawberry plants within the enclosed planting area includes: A growth stage image library of strawberry plants is established, including the plant height corresponding to each growth stage. A side view image of a strawberry plant is obtained, and the side view image is divided into several pixels. The total number of pixels occupied by the strawberry plant is recorded as the plant height. In the growth stage image library, the plant height of the growth stage with the smallest absolute value of the difference from the plant height is obtained and recorded as the current growth stage plant height. The growth stage corresponding to the current growth stage plant height is recorded as the current growth stage of the strawberry plant in the closed planting area.

[0007] As a further aspect of the present invention: the process of establishing the growth stage image library includes: Obtain several strawberry plant samples of the same variety. For any strawberry plant sample, record the planting time and harvest time. The total growth cycle of the strawberry plant sample is obtained from the planting and harvesting times. The average of the total growth cycle of all strawberry plant samples is obtained to obtain the total growth cycle of the strawberry plant. Based on the artificial division of the entire growth cycle into several growth stages, for any growth stage, several growth nodes are selected within the growth stage. When the strawberry plant reaches each growth node during the growth process, a side sample image of the strawberry plant is obtained. The plant height of the strawberry plant in the side sample image at each growth node is obtained, and the average plant height at each growth node is obtained, which is recorded as the plant height of the growth stage.

[0008] As a further aspect of the present invention: the growth temperature database includes the optimal growth temperature range for strawberry plants at each growth stage, and the growth temperature database is based on manual settings; the target temperature range is the optimal growth temperature range corresponding to the current growth stage in the growth temperature database.

[0009] As a further aspect of the present invention: the difference between the upper limit of the target temperature range and the current ambient temperature is obtained and denoted as the temperature difference.

[0010] As a further aspect of the present invention: the process of generating the allowable temperature rise margin value includes: Set a temperature safety factor for the current growth stage, with the value range being (0, 1). Multiply the temperature safety factor by the temperature difference to obtain the product result, and record the product result as the allowable temperature rise margin value.

[0011] As a further aspect of the present invention: the process of obtaining the maximum supplementary lighting duration includes multiplying the allowable temperature rise margin value by the volumetric heat capacity parameter to obtain the allowable heat increment value, dividing the allowable heat increment value by the electro-optical conversion heat loss power, and the resulting quotient value is the maximum supplementary lighting duration.

[0012] A strawberry year-round cultivation system using artificial light sources, applied in enclosed cultivation areas, includes: Temperature rise margin determination module: Determines the current growth stage of strawberry plants in the closed planting area, obtains the target temperature range for the current growth stage based on a preset growth temperature database, and acquires the current ambient temperature in the closed planting area; obtains the temperature difference between the target temperature range and the current ambient temperature, and generates an allowable temperature rise margin value based on the temperature difference. The supplementary lighting cycle determination module acquires the electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameter of the enclosed planting area. Based on the electro-optical conversion heat loss power, volumetric heat capacity parameter, and allowable temperature rise margin, the maximum supplementary lighting duration is obtained. A continuous supplementary lighting duration is set based on the maximum supplementary lighting duration. The artificial light source provides supplementary lighting within the continuous supplementary lighting duration. After the continuous supplementary lighting duration ends, the artificial light source is turned off, and a preset interval period begins. The continuous supplementary lighting duration and the interval period constitute the supplementary lighting cycle. Cyclic module: During the intermittent period, the real-time ambient temperature in the enclosed planting area is continuously monitored. When the real-time ambient temperature is detected to drop to the preset lower limit threshold, the intermittent period is terminated, and the execution steps S1 to S2 are returned to enter a new supplemental lighting cycle.

[0013] The beneficial effects of this invention are: Existing technologies often passively dissipate heat after the light source generates heat through air conditioning, water cooling, etc. This not only consumes a huge amount of energy but also causes a lag in temperature response due to thermal inertia, making it prone to short-term overshoot and repeatedly breaking the strict low-temperature threshold during flower bud differentiation. This method abandons this "pollute first, then clean up" approach, instead starting from the first law of thermodynamics. Before each supplemental lighting action, it pre-quantifies the maximum heat increment that the planting space can currently bear based on the difference between the current ambient temperature and the upper limit of the target temperature range. Then, combined with the known electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameters of the planting area, it reverse-calculates the longest permissible supplemental lighting duration that will not cause overheating. This heat-determined light-determining reverse calculation mechanism means that the photoperiod is no longer a fixed preset value but a dynamic value that changes with real-time temperature. The system incorporates variables to achieve an adaptive balance between light radiation supply and heat carrying capacity. Furthermore, by introducing a safety factor dynamically generated based on historical overshoot data and the system's thermal inertia hysteresis characteristics, the allowable temperature rise margin is conservatively discounted, further reserving buffer space for unforeseen temperature fluctuations and ensuring the system's robustness under complex operating conditions. The entire solution requires no additional heat dissipation hardware or complex light guide structures; it can be deployed and implemented in existing planting facilities simply through intelligent orchestration of the light source timing, significantly reducing system complexity and deployment costs. Simultaneously, it significantly improves the accuracy and stability of temperature and light synergistic control for strawberry production throughout the four seasons in a closed planting environment, providing a reliable and easily promoted technical path for precise light environment management of perennial crops in facility agriculture. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram illustrating the steps of a strawberry cultivation method using artificial light sources throughout the four seasons according to the present invention.

[0016] Figure 2 This is a flowchart illustrating a method for year-round strawberry cultivation using artificial light sources, as per the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 As shown, this invention is a method for year-round strawberry cultivation using artificial light sources, applicable to enclosed planting areas, and includes the following steps: Step S1: Determine the current growth stage of the strawberry plants in the enclosed planting area, obtain the target temperature range for the current growth stage based on a preset growth temperature database, and obtain the current ambient temperature in the enclosed planting area; obtain the temperature difference between the target temperature range and the current ambient temperature, and generate an allowable temperature rise margin value based on the temperature difference.

[0019] In a preferred embodiment of the present invention, the process of determining the current growth stage of the strawberry plants within the enclosed planting area includes: A growth stage image library of strawberry plants is established, including the plant height corresponding to each growth stage. A side view image of a strawberry plant is obtained, and the side view image is divided into several pixels. The total number of pixels occupied by the strawberry plant is recorded as the plant height. In the growth stage image library, the plant height of the growth stage with the smallest absolute value of the difference from the plant height is obtained and recorded as the current growth stage plant height. The growth stage corresponding to the current growth stage plant height is recorded as the current growth stage of the strawberry plant in the closed planting area.

[0020] The process of establishing the growth stage image library includes: Obtain several strawberry plant samples of the same variety. For any strawberry plant sample, record the planting time and harvest time. The total growth cycle of the strawberry plant sample is obtained from the planting and harvesting times. The average of the total growth cycle of all strawberry plant samples is obtained to obtain the total growth cycle of the strawberry plant. Based on the artificial division of the entire growth cycle into several growth stages, for any growth stage, several growth nodes are selected within the growth stage. When the strawberry plant reaches each growth node during the growth process, a side sample image of the strawberry plant is obtained. The plant height of the strawberry plant in the side sample image at each growth node is obtained, and the average plant height at each growth node is obtained, which is recorded as the plant height of the growth stage.

[0021] In a preferred embodiment of the present invention, the growth temperature database includes the optimal growth temperature range for strawberry plants at each growth stage, and the growth temperature database is based on manual settings; the target temperature range is the optimal growth temperature range corresponding to the current growth stage in the growth temperature database.

[0022] In a preferred embodiment of the present invention, the difference between the upper limit of the target temperature range and the current ambient temperature is obtained and denoted as the temperature difference.

[0023] In a preferred embodiment of the present invention, the process of generating the allowable temperature rise margin value includes: Set a temperature safety factor for the current growth stage, with the value range being (0, 1). Multiply the temperature safety factor by the temperature difference to obtain the product result, and record the product result as the allowable temperature rise margin value.

[0024] The process of setting the safety factor includes: Several sets of reference temperature control deviation records were obtained from an external database. These records were derived from similar planting facilities with the same thermal characteristics as the enclosed planting area. The records documented all temperature overshoot events that occurred during the actual operation of the strawberry plants at the current growth stage. Each reference temperature control deviation record included the overshoot amplitude when the ambient temperature exceeded the upper limit of the target temperature range at the time of each overshoot event, and the duration of the last supplemental lighting cycle before the overshoot event's emitter. Based on all reference temperature control deviation records, a scatter plot dataset was constructed with supplemental lighting duration as the independent variable and overshoot amplitude as the dependent variable. Curve fitting was performed on the scatter plot dataset to obtain a regression curve showing the overshoot amplitude as a function of supplemental lighting duration. The overshoot amplitude corresponding to the maximum supplemental lighting duration was obtained from the regression curve and used as the predicted overshoot. The predicted overshoot was divided by the width of the target temperature range to obtain the overshoot percentage, which was then subtracted from the value 1. The absolute value of the subtraction result was used as the temperature safety factor.

[0025] Step S2: Obtain the electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameter of the enclosed planting area. Based on the electro-optical conversion heat loss power, the volumetric heat capacity parameter, and the allowable temperature rise margin, obtain the maximum supplementary lighting duration. Set the continuous supplementary lighting duration based on the maximum supplementary lighting duration. The artificial light source provides supplementary lighting within the continuous supplementary lighting duration. After the continuous supplementary lighting duration ends, the artificial light source is turned off, and a preset interval period is entered. The continuous supplementary lighting duration and the interval period constitute the supplementary lighting cycle.

[0026] In a preferred embodiment of the present invention, the electro-optical conversion heat loss power is the difference between the rated input electrical power of the artificial light source and the rated output optical radiation power of the artificial light source, and the rated output optical radiation power is determined based on the integral value of the optical radiation flux of the artificial light source in the visible light band.

[0027] In a preferred embodiment of the present invention, the volumetric heat capacity parameter is the product of the total volume participating in heat exchange within the enclosed planting area and the weighted average volumetric specific heat capacity corresponding to the total volume. The total volume includes the air volume, the wall surface, and the ground surface structure volume. The weighted average volumetric specific heat capacity is the quotient obtained by summing the products of the material density and the material specific heat capacity corresponding to each total volume within the enclosed planting area and dividing by the sum of the total volumes.

[0028] In a preferred embodiment of the present invention, the process of obtaining the maximum supplementary lighting duration includes multiplying the allowable temperature rise margin value by the volumetric heat capacity parameter to obtain the allowable heat increment value, and dividing the allowable heat increment value by the electro-optical conversion heat loss power, the resulting quotient being the maximum supplementary lighting duration.

[0029] In a preferred embodiment of the present invention, the continuous supplementary lighting duration is the duration of the artificial light source being turned on during the supplementary lighting cycle, and the duration of the continuous supplementary lighting duration is the same as the maximum supplementary lighting duration.

[0030] It is understood that the maximum supplemental lighting duration is taken as the duration of a single continuous supplemental lighting session within the supplemental lighting cycle, and the artificial light source remains off during the remaining period of the supplemental lighting cycle.

[0031] Step S3: During the intermittent period, continuously monitor the real-time ambient temperature in the enclosed planting area. When the real-time ambient temperature is detected to drop back to the preset lower limit threshold, terminate the intermittent period and return to execute steps S1 to S2 to enter a new supplemental lighting cycle.

[0032] It is worth noting that, in addition to monitoring that the real-time ambient temperature drops back to the preset lower limit threshold, the intermittent period will also be terminated when the duration of the intermittent period reaches the preset maximum safe dark period duration; that is, even if the temperature does not drop, the machine can be forcibly turned on through the maximum safe dark period duration to ensure the basic physiological needs of the strawberry plants.

[0033] Specifically, during the intermittent time period, real-time ambient temperature signals are continuously acquired at a preset sampling frequency, and the real-time ambient temperature value obtained from each sampling is compared with a preset lower temperature threshold.

[0034] The process of determining the preset lower temperature threshold includes: Obtain the lower limit value of the target temperature range, and subtract the lower limit value from the preset hysteresis bandwidth value. The difference obtained is the lower limit threshold value of the temperature range. The hysteresis bandwidth value is a positive number, and its curvature makes a temperature buffer band formed between the lower limit value of the target temperature range and the lower limit threshold value of the temperature range.

[0035] Furthermore, when the real-time ambient temperature values ​​obtained from N consecutive samplings are all less than or equal to the lower limit threshold, it is determined that the real-time ambient temperature has stably fallen back to the preset lower limit threshold, and the intermittent time period is terminated; if the real-time ambient temperature value of any one of the N consecutive samplings is higher than the lower limit threshold, the counting starts again; where N is the preset number of times threshold; after terminating the intermittent time period, the process returns to step S1, where the current ambient temperature mentioned in step S1 is the real-time ambient temperature re-collected at this moment, and the controller regenerates a new allowable temperature rise margin value accordingly, and enters step S2 to calculate the maximum supplementary lighting duration for the next supplementary lighting cycle, so as to start a new round of supplementary lighting cycle.

[0036] A strawberry year-round cultivation system using artificial light sources, applied in enclosed cultivation areas, includes: Temperature rise margin determination module: Determines the current growth stage of strawberry plants in the closed planting area, obtains the target temperature range for the current growth stage based on a preset growth temperature database, and acquires the current ambient temperature in the closed planting area; obtains the temperature difference between the target temperature range and the current ambient temperature, and generates an allowable temperature rise margin value based on the temperature difference. The supplementary lighting cycle determination module acquires the electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameter of the enclosed planting area. Based on the electro-optical conversion heat loss power, volumetric heat capacity parameter, and allowable temperature rise margin, the maximum supplementary lighting duration is obtained. A continuous supplementary lighting duration is set based on the maximum supplementary lighting duration. The artificial light source provides supplementary lighting within the continuous supplementary lighting duration. After the continuous supplementary lighting duration ends, the artificial light source is turned off, and a preset interval period begins. The continuous supplementary lighting duration and the interval period constitute the supplementary lighting cycle. Cyclic module: During the intermittent period, the real-time ambient temperature in the enclosed planting area is continuously monitored. When the real-time ambient temperature is detected to drop to the preset lower limit threshold, the intermittent period is terminated, and the execution steps S1 to S2 are returned to enter a new supplemental lighting cycle.

[0037] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A method for year-round strawberry cultivation using artificial light sources, applied in enclosed cultivation areas, characterized in that: Includes the following steps: Step S1: Determine the current growth stage of the strawberry plants in the closed planting area, obtain the target temperature range of the current growth stage based on the preset growth temperature database, and obtain the current ambient temperature in the closed planting area; obtain the temperature difference between the target temperature range and the current ambient temperature, and generate the allowable temperature rise margin value based on the temperature difference. Step S2: Obtain the electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameter of the enclosed planting area. Based on the electro-optical conversion heat loss power, volumetric heat capacity parameter, and allowable temperature rise margin, obtain the maximum supplementary lighting duration. Set the continuous supplementary lighting duration based on the maximum supplementary lighting duration. The artificial light source provides supplementary lighting within the continuous supplementary lighting duration. After the continuous supplementary lighting duration ends, the artificial light source is turned off, and a preset interval period is entered. The continuous supplementary lighting duration and the interval period constitute the supplementary lighting cycle. Step S3: During the intermittent period, continuously monitor the real-time ambient temperature in the enclosed planting area. When the real-time ambient temperature is detected to drop back to the preset lower limit threshold, terminate the intermittent period and return to execute steps S1 to S2 to enter a new supplemental lighting cycle.

2. The method for year-round strawberry cultivation using artificial light source according to claim 1, characterized in that, In step S1, the process of determining the current growth stage of the strawberry plants within the enclosed planting area includes: A growth stage image library of strawberry plants is established, including the plant height corresponding to each growth stage. A side view image of a strawberry plant is obtained, and the side view image is divided into several pixels. The total number of pixels occupied by the strawberry plant is recorded as the plant height. In the growth stage image library, the plant height of the growth stage with the smallest absolute value of the difference from the plant height is obtained and recorded as the current growth stage plant height. The growth stage corresponding to the current growth stage plant height is recorded as the current growth stage of the strawberry plant in the closed planting area.

3. A method for year-round strawberry cultivation using artificial light as described in claim 2, characterized in that, In step S1, the process of establishing the growth stage image library includes: Obtain several strawberry plant samples of the same variety. For any strawberry plant sample, record the planting time and harvest time. The total growth cycle of the strawberry plant sample is obtained from the planting and harvesting times. The average of the total growth cycle of all strawberry plant samples is obtained to obtain the total growth cycle of the strawberry plant. Based on the artificial division of the entire growth cycle into several growth stages, for any growth stage, several growth nodes are selected within the growth stage. When the strawberry plant reaches each growth node during the growth process, a side sample image of the strawberry plant is obtained. The plant height of the strawberry plant in the side sample image at each growth node is obtained, and the average plant height at each growth node is obtained, which is recorded as the plant height of the growth stage.

4. A method for year-round strawberry cultivation using artificial light as described in claim 1, characterized in that, In step S1, the growth temperature database includes the optimal growth temperature range for strawberry plants at each growth stage, and the growth temperature database is based on manual settings; the target temperature range is the optimal growth temperature range corresponding to the current growth stage in the growth temperature database.

5. A method for year-round strawberry cultivation using artificial light as described in claim 1, characterized in that, In step S1, the difference between the upper limit of the target temperature range and the current ambient temperature is obtained and recorded as the temperature difference.

6. A method for year-round strawberry cultivation using artificial light as described in claim 1, characterized in that, In step S1, the process of generating the allowable temperature rise margin value includes: Set a temperature safety factor for the current growth stage, with the value range being (0, 1). Multiply the temperature safety factor by the temperature difference to obtain the product result, and record the product result as the allowable temperature rise margin value.

7. A method for year-round strawberry cultivation using artificial light as described in claim 1, characterized in that, In step S2, the process of obtaining the maximum supplementary lighting duration includes multiplying the allowable temperature rise margin value by the volumetric heat capacity parameter to obtain the allowable heat increment value, dividing the allowable heat increment value by the electro-optical conversion heat loss power, and the resulting quotient is the maximum supplementary lighting duration.

8. A strawberry year-round planting system using artificial light sources, applied in enclosed planting areas, characterized in that, include: Temperature rise margin determination module: Determines the current growth stage of strawberry plants in the closed planting area, obtains the target temperature range for the current growth stage based on a preset growth temperature database, and acquires the current ambient temperature in the closed planting area; obtains the temperature difference between the target temperature range and the current ambient temperature, and generates an allowable temperature rise margin value based on the temperature difference. The supplementary lighting cycle determination module acquires the electro-optical conversion heat loss power of the artificial light source and the volumetric heat capacity parameter of the enclosed planting area. Based on the electro-optical conversion heat loss power, volumetric heat capacity parameter, and allowable temperature rise margin, the maximum supplementary lighting duration is obtained. A continuous supplementary lighting duration is set based on the maximum supplementary lighting duration. The artificial light source provides supplementary lighting within the continuous supplementary lighting duration. After the continuous supplementary lighting duration ends, the artificial light source is turned off, and a preset interval period begins. The continuous supplementary lighting duration and the interval period constitute the supplementary lighting cycle. Cyclic module: During the intermittent period, the real-time ambient temperature in the enclosed planting area is continuously monitored. When the real-time ambient temperature is detected to drop to the preset lower limit threshold, the intermittent period is terminated, and the execution steps S1 to S2 are returned to enter a new supplemental lighting cycle.

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