CN111504617A - Plant growth light source determination method and system - Google Patents
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- 230000008635 plant growth Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000000243 photosynthetic effect Effects 0.000 claims abstract description 109
- 238000012216 screening Methods 0.000 claims abstract description 9
- 241000196324 Embryophyta Species 0.000 description 18
- 241000208822 Lactuca Species 0.000 description 9
- 235000003228 Lactuca sativa Nutrition 0.000 description 9
- 238000011282 treatment Methods 0.000 description 5
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
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- 229930002875 chlorophyll Natural products 0.000 description 1
- 235000019804 chlorophyll Nutrition 0.000 description 1
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 description 1
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/04—Electric or magnetic or acoustic treatment of plants for promoting growth
- A01G7/045—Electric or magnetic or acoustic treatment of plants for promoting growth with electric lighting
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Abstract
The invention discloses a plant growth light source determining method and a plant growth light source determining system. The method comprises the following steps: taking the net photosynthetic rate of the plant under continuous light and the net photosynthetic rate of the plant under pulsed light with different parameters to obtain the continuous net photosynthetic rate and a plurality of pulse net photosynthetic rates; the parameters include frequency and duty cycle; screening out a net photosynthetic rate closest to the continuous net photosynthetic rate from the plurality of pulse net photosynthetic rates to obtain a target net photosynthetic rate; extracting the frequency and the duty ratio of pulsed light corresponding to the target net photosynthetic rate to obtain a critical frequency and a critical duty ratio; calculating the critical dark period duration by using the critical frequency and the critical duty ratio; and determining the pulsed light with the dark period duration being lower than the critical dark period duration as a plant growth light source. The invention reduces the power consumption of the light source under the condition of not influencing the yield, thereby achieving the purpose of energy saving.
Description
Technical Field
The invention relates to the field of light sources, in particular to a plant growth light source determining method and a plant growth light source determining system.
Background
At present, the consumption of electric energy of an artificial light source is large, especially in a plant factory, 80% of the electric energy consumption is used for a lighting system, and the cost of L ED supplementary lighting is still high.
Compared with continuous light, the pulse light is considered to be a light energy supply mode which can fully exert the photosynthetic kinetic efficiency of the existing plant genotype and realize the efficient conversion and utilization of light energy on the basis of avoiding energy surplus, and especially basically realizes the automatic regulation and control of the pulse light consisting of different frequencies, intermittent light intensity and duty ratio after a high-power L ED lamp and a driving power supply enter a rapid development period.
Pulsed light is an energy-saving light source, but the research on pulsed light only shows that under the condition of high frequency and duty ratio, plants under the light can obtain the same yield or better quality as continuous light. However, the pulse light power consumption is composed of static power consumption (influenced by duty ratio) and dynamic power consumption (influenced by frequency), and the power consumption of the light source is increased due to the excessively high duty ratio and frequency, which is not favorable for the energy-saving effect of the pulse light.
Disclosure of Invention
Therefore, there is a need to provide a method and a system for determining a plant growth light source, so as to reduce power consumption of the light source without affecting yield and achieve the purpose of energy saving.
In order to achieve the purpose, the invention provides the following scheme:
a plant growth light source determination method, comprising:
obtaining the net photosynthetic rate of the plant under continuous light to obtain the continuous net photosynthetic rate;
acquiring net photosynthetic rates of plants under pulsed light with different parameters to obtain a plurality of pulse net photosynthetic rates; the parameters include frequency and duty cycle;
screening out a net photosynthetic rate closest to the continuous net photosynthetic rate from the plurality of pulse net photosynthetic rates to obtain a target net photosynthetic rate;
extracting the frequency and the duty ratio of the pulsed light corresponding to the target net photosynthetic rate to obtain a critical frequency and a critical duty ratio;
calculating a critical dark period duration using the critical frequency and the critical duty cycle;
and determining the pulsed light with the dark period duration being lower than the critical dark period duration as a plant growth light source.
Optionally, the calculation formula of the dark period duration is as follows:
dark period duration is (1-duty cycle)/frequency.
Optionally, the obtaining of the net photosynthetic rate of the plant under the pulsed light of different parameters to obtain a plurality of pulsed net photosynthetic rates specifically includes:
and acquiring the net photosynthetic rate of the plant measured by the L i-6800 type photosynthetic apparatus under the pulsed light with different parameters to obtain a plurality of pulsed net photosynthetic rates.
Optionally, the critical dark period duration is 0.0015625 s.
The present invention also provides a plant growth light source determination system, comprising:
the first net photosynthetic rate acquisition module is used for acquiring the net photosynthetic rate of the plant under continuous light to obtain the continuous net photosynthetic rate;
the second net photosynthetic rate acquisition module is used for acquiring net photosynthetic rates of plants under pulsed light with different parameters to obtain a plurality of pulse net photosynthetic rates; the parameters include frequency and duty cycle;
the screening module is used for screening out a net photosynthetic rate closest to the continuous net photosynthetic rate from the pulse net photosynthetic rates to obtain a target net photosynthetic rate;
a critical value determining module, configured to extract a frequency and a duty ratio of pulsed light corresponding to the target net photosynthetic rate to obtain a critical frequency and a critical duty ratio;
the critical dark period duration calculation module is used for calculating the critical dark period duration by utilizing the critical frequency and the critical duty ratio;
and the light source determining module is used for determining the pulsed light with the dark period duration being lower than the critical dark period duration as a plant growth light source.
Optionally, the calculation formula of the dark period duration is as follows:
dark period duration is (1-duty cycle)/frequency.
Optionally, the second net photosynthetic rate obtaining module specifically includes:
and the net photosynthetic rate acquisition unit is used for acquiring the net photosynthetic rates of the plants measured by the L i-6800 type photosynthetic instrument under the pulsed light with different parameters to obtain a plurality of pulsed net photosynthetic rates.
Optionally, the critical dark period duration is 0.0015625 s.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a plant growth light source determining method and system, wherein the critical dark period duration is determined through the continuous net photosynthetic rate and the pulse net photosynthetic rates, and the pulse light with the dark period duration lower than the critical dark period duration is determined as the plant growth light source, so that the power consumption of the light source is reduced under the condition of not influencing the yield, and the aim of saving energy is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flowchart of a method for determining a light source for plant growth according to embodiment 1 of the present invention;
FIG. 2 is a graph of net photosynthetic rate of lettuce leaves at different frequencies and duty cycles in accordance with example 2 of the present invention;
FIG. 3 is a graph showing the comparison results of different frequency and duty cycle combinations with continuous light in example 2 of the present invention;
fig. 4 is a schematic structural diagram of a plant growth light source determination system according to embodiment 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a method for determining a plant growth light source according to embodiment 1 of the present invention.
Referring to fig. 1, the method for determining a plant growth light source of the present embodiment includes:
step S1: and acquiring the net photosynthetic rate of the plant under continuous light to obtain the continuous net photosynthetic rate.
Step S2: acquiring net photosynthetic rates of plants under pulsed light with different parameters to obtain a plurality of pulse net photosynthetic rates; the parameters include frequency and duty cycle.
The step S2 specifically includes:
and acquiring the net photosynthetic rate of the plant measured by the L i-6800 type photosynthetic apparatus under the pulsed light with different parameters to obtain a plurality of pulsed net photosynthetic rates.
Step S3: and screening out the net photosynthetic rate closest to the continuous net photosynthetic rate from the pulse net photosynthetic rates to obtain the target net photosynthetic rate.
Step S4: and extracting the frequency and the duty ratio of the pulse light corresponding to the target net photosynthetic rate to obtain the critical frequency and the critical duty ratio.
Step S5: calculating a critical dark period duration using the critical frequency and the critical duty cycle.
The calculation formula of the dark period duration is as follows: the critical dark period duration is (1-critical duty cycle)/critical frequency.
Step S6: and determining the pulsed light with the dark period duration being lower than the critical dark period duration as a plant growth light source.
The calculation formula of the dark period duration is as follows:
dark period duration is (1-duty cycle)/frequency.
As an alternative embodiment, the critical dark period duration is 0.0015625 s.
The method for determining the plant growth light source can reduce the power consumption of the light source under the condition of not influencing the yield, and achieves the purpose of energy conservation.
A more specific embodiment is provided below.
Example 2
Designing 14 levels of frequency (1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz, 64Hz, 128Hz, 256Hz, 512Hz, 1024Hz, 2048Hz, 4096Hz, 8192Hz) and 5 levels of duty cycle (20%, 40%, 60%, 80%, 100%) parameters, totaling 70 combinations of pulsed light treatments, with light intensity set to 180 [ mu ] mol m-2·s-1The net photosynthetic rate (Pn) of lettuce under pulsed light of different parameters was measured using a model L i-6800 photosynthesizer, and the results are shown in table 1:
TABLE 1 Net photosynthetic Rate at different frequencies, Duty cycles
Pulsed light at 100% duty cycle was considered as continuous light and used as a control for this measurement. From the above data, it is concluded that when the frequency and duty cycle reach a certain level, the net photosynthetic rate is not significantly different compared to the continuous light. At the same time, the dark period durations of the 70 combinations were calculated, and the results are shown in table 2:
TABLE 2 duration of corresponding dark period under different frequencies and duty ratios
It can be found from the combination of table 1 and table 2 that when the duration of the dark period is less than 0.0015625s, the net photosynthetic rate of the lettuce leaves under the pulsed light satisfying the condition has no obvious difference from that of the continuous light, and the magnitude of the net photosynthetic rate of the leaves determines the crop yield to a certain extent because the net photosynthetic rate directly affects the biomass accumulation of the plants. Experiments prove that the lettuce under the condition of the pulse light irradiation of the frequency and the duty ratio has no significant difference between the growth and development and biomass accumulation and the continuous light, and is superior to the continuous light in the quality aspects of soluble total sugar, reducing sugar, nitrate nitrogen and the like. The frequency and duty cycle under this condition are the optimal frequency and duty cycle parameters.
The validity of the plant growth light source determination method of the embodiment is verified below.
The net photosynthetic rates of the lettuce leaves at different frequencies and duty ratios are shown in fig. 2 through actual measurement.
The long-term light test treatment is performed under the same instantaneous light intensity by selecting three frequency and duty ratio combinations of 20%, 2048Hz (T1), 40%, 512Hz (T2), 80%, 128Hz (T3), namely three groups of pulse light with dark period duration less than or equal to 0.0015625s, the light period is 12h, and the result is shown in FIG. 3 by comparing with continuous light (CK), wherein part (a) of FIG. 3 is a result graph of T1 combination, part (b) of FIG. 3 is a result graph of T2 combination, part (c) of FIG. 3 is a result graph of T3 combination, and part (d) of FIG. 3 is a result graph of CK. The results show that: the indexes of the lettuce under different pulsed light treatments, such as the dry fresh weight, the plant height, the leaf width and the like, and the indexes of the net photosynthetic rate, the chlorophyll fluorescence parameters and the like, have no significant difference compared with continuous light, the soluble total sugar, the reducing sugar and the nitrate nitrogen content of the lettuce under each pulsed light treatment in the aspect of quality are superior to those of the continuous light, the lettuce under the T1 treatment has the best quality, compared with the continuous light, the content difference of VC and soluble protein is not significant, but the content of the soluble total sugar and the reducing sugar is respectively improved by 64.32 percent and 72.98 percent, and the content of the nitrate nitrogen is reduced by 41.94 percent.
According to the method for determining the plant growth light source, the lettuce is irradiated under the frequency and duty ratio parameters corresponding to the dark period time less than or equal to 0.0015625s, the yield is not influenced, better quality can be obtained, the power consumption of the light source is reduced, and the purpose of energy conservation is achieved.
Example 3
Fig. 4 is a schematic structural diagram of a plant growth light source determination system according to embodiment 3 of the present invention. Referring to fig. 4, the plant growth light source determination system of the present embodiment includes:
a first net photosynthetic rate obtaining module 401, configured to obtain a net photosynthetic rate of the plant under continuous light, so as to obtain a continuous net photosynthetic rate.
A second net photosynthetic rate obtaining module 402, configured to obtain net photosynthetic rates of the plant under pulsed light with different parameters, so as to obtain a plurality of pulse net photosynthetic rates; the parameters include frequency and duty cycle.
A screening module 403, configured to screen a net photosynthetic rate closest to the continuous net photosynthetic rate from the plurality of pulse net photosynthetic rates, so as to obtain a target net photosynthetic rate.
A critical value determining module 404, configured to extract a frequency and a duty ratio of pulsed light corresponding to the target net photosynthetic rate, so as to obtain a critical frequency and a critical duty ratio.
A critical dark period duration calculation module 405, configured to calculate a critical dark period duration using the critical frequency and the critical duty cycle.
A light source determining module 406, configured to determine pulsed light with a dark period duration less than the critical dark period duration as a plant growth light source.
As an alternative embodiment, the calculation formula of the dark period duration is:
dark period duration is (1-duty cycle)/frequency.
As an optional implementation manner, the second net photosynthetic rate obtaining module 402 specifically includes:
and the net photosynthetic rate acquisition unit is used for acquiring the net photosynthetic rates of the plants measured by the L i-6800 type photosynthetic instrument under the pulsed light with different parameters to obtain a plurality of pulsed net photosynthetic rates.
As an alternative embodiment, the critical dark period duration is 0.0015625 s.
The plant growth light source determining system of the embodiment can reduce the power consumption of the light source under the condition of not influencing the yield, and achieves the purpose of energy conservation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A method for determining a light source for plant growth, comprising:
obtaining the net photosynthetic rate of the plant under continuous light to obtain the continuous net photosynthetic rate;
acquiring net photosynthetic rates of plants under pulsed light with different parameters to obtain a plurality of pulse net photosynthetic rates; the parameters include frequency and duty cycle;
screening out a net photosynthetic rate closest to the continuous net photosynthetic rate from the plurality of pulse net photosynthetic rates to obtain a target net photosynthetic rate;
extracting the frequency and the duty ratio of the pulsed light corresponding to the target net photosynthetic rate to obtain a critical frequency and a critical duty ratio;
calculating a critical dark period duration using the critical frequency and the critical duty cycle;
and determining the pulsed light with the dark period duration being lower than the critical dark period duration as a plant growth light source.
2. The method for determining the light source for plant growth according to claim 1, wherein the dark period duration is calculated by the formula:
dark period duration is (1-duty cycle)/frequency.
3. The method for determining the light source for plant growth according to claim 1, wherein the obtaining the net photosynthetic rate of the plant under the pulsed light with different parameters to obtain a plurality of pulsed net photosynthetic rates comprises:
and acquiring the net photosynthetic rate of the plant measured by the L i-6800 type photosynthetic apparatus under the pulsed light with different parameters to obtain a plurality of pulsed net photosynthetic rates.
4. The method for determining the light source for plant growth according to claim 1, wherein the critical dark period duration is 0.0015625 s.
5. A plant growth light source determination system, comprising:
the first net photosynthetic rate acquisition module is used for acquiring the net photosynthetic rate of the plant under continuous light to obtain the continuous net photosynthetic rate;
the second net photosynthetic rate acquisition module is used for acquiring net photosynthetic rates of plants under pulsed light with different parameters to obtain a plurality of pulse net photosynthetic rates; the parameters include frequency and duty cycle;
the screening module is used for screening out a net photosynthetic rate closest to the continuous net photosynthetic rate from the pulse net photosynthetic rates to obtain a target net photosynthetic rate;
a critical value determining module, configured to extract a frequency and a duty ratio of pulsed light corresponding to the target net photosynthetic rate to obtain a critical frequency and a critical duty ratio;
the critical dark period duration calculation module is used for calculating the critical dark period duration by utilizing the critical frequency and the critical duty ratio;
and the light source determining module is used for determining the pulsed light with the dark period duration being lower than the critical dark period duration as a plant growth light source.
6. The plant growth light source determining system of claim 5, wherein the dark period duration is calculated by the formula:
dark period duration is (1-duty cycle)/frequency.
7. The system for determining plant growth light source according to claim 5, wherein the second net photosynthetic rate obtaining module specifically comprises:
and the net photosynthetic rate acquisition unit is used for acquiring the net photosynthetic rates of the plants measured by the L i-6800 type photosynthetic instrument under the pulsed light with different parameters to obtain a plurality of pulsed net photosynthetic rates.
8. The plant growth light source determining system of claim 5, wherein the critical dark period duration is 0.0015625 s.
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| ZA2020/04449A ZA202004449B (en) | 2020-06-05 | 2020-07-20 | Method and system for determining light source for plant growth |
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| CN111504617B (en) | 2022-02-08 |
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