CN108775858A - A kind of sensor and its application method of monitoring water depth - Google Patents
A kind of sensor and its application method of monitoring water depth Download PDFInfo
- Publication number
- CN108775858A CN108775858A CN201810452075.1A CN201810452075A CN108775858A CN 108775858 A CN108775858 A CN 108775858A CN 201810452075 A CN201810452075 A CN 201810452075A CN 108775858 A CN108775858 A CN 108775858A
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- anode
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- slide rheostat
- cathode
- deposit
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000012544 monitoring process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 7
- 239000000446 fuel Substances 0.000 claims abstract description 17
- 230000002906 microbiologic effect Effects 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000000813 microbial effect Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract 1
- 244000005700 microbiome Species 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- JNUWVIUFGREERU-WOPPDYDQSA-N 4-amino-5-fluoro-1-[(2r,3s,4s,5r)-4-hydroxy-5-(hydroxymethyl)-3-methyloxolan-2-yl]pyrimidin-2-one Chemical compound C[C@H]1[C@H](O)[C@@H](CO)O[C@H]1N1C(=O)N=C(N)C(F)=C1 JNUWVIUFGREERU-WOPPDYDQSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/26—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring depth
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
- G01C13/008—Surveying specially adapted to open water, e.g. sea, lake, river or canal measuring depth of open water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The present invention discloses a kind of sensor of monitoring water depth, including deposit microbiological fuel cell, signal picker, ammeter and height adjustment mechanism, the anode of deposit Microbial fuel is connected cathode with external resistance by conducting wire and forms the first external circuit, anode is set to inside deposit, signal picker connects the first external circuit, acquire electric current, voltage or electric potential signal, height adjustment mechanism includes slide rheostat and height adjuster, height adjuster adjusts the slider of slide rheostat, slider is fixedly connected with the cathode fixed plate for securing cathode, slide rheostat and ammeter are serially connected in the second external circuit.Device sensitivity of the present invention is high, simple in structure, construction operation is low with maintenance cost.The basins such as rivers, Hu Hai, reservoir inspective regulation and flood control are can be widely applied to, there is certain social and economic benefit.
Description
Technical field
The invention belongs to environmental monitoring technology fields, and in particular to a kind of to be monitored using sediment microorganism electrochemical principle
The device and its application method of water depth.
Background technology
Water depth is an important factor for influencing water ecosystem, such as to affect the growth of aquatic animals and plants；Influence light
Photocatalysis is influenced according to the projection depth of condition in turn.Method currently used for sounding the depth of the water usually uses bathysonde, such as
Sounding Rod, water thallium, echo depth sounder, multi-beam echo sounder system and submarine geomorphy survey meter etc., usually portable equipment.
However water depth variation, current monitoring means occur constantly is difficult to accomplish in real time due to evaporation or the factors such as precipitation
Monitoring, there has been no the correlative study reports about water depth real time monitoring at present.
In recent years, microbiological fuel cell（MFC）It rapidly develops, provides a kind of completely new bio-sensing method and dress
It sets, and deposit microbiological fuel cell（SMFC）It is the MFC to play a role in practice up to now.Its action principle
For：Anode material is positioned in the deposit of anaerobism, cathode material is located in the aerobic water phase in upper layer, between cathode and anode
It is connected with resistance by conducting wire, organic matter is deposited indigenous microorganism oxygenolysis in object near anode region and produces in deposit
Raw electronics is transmitted to cathode through conducting wire, and proton also passes to cathode by water body, the oxygen knot in electronics, proton and cathodic region
Symphysis Cheng Shui, while generating electric current.
Invention content
The purpose of the present invention is to provide a kind of water depth is monitored using sediment microorganism electrochemical reaction principle
Sensor has the advantages that removable, device is simple, operation is easy, and application prospect is extensive.
Technical purpose to realize the present invention, the present invention adopt the following technical scheme that：
A kind of sensor of monitoring water depth, including deposit microbiological fuel cell, signal picker 8, ammeter and height
Regulating mechanism is spent,
The deposit microbiological fuel cell includes cathode 1, anode 2 and external resistance 5, and the anode 2 connects institute by conducting wire 6
Cathode 1 is stated, the external resistance 5, which is serially connected on the conducting wire 6, forms the first external circuit, and the anode 2 is set to inside deposit,
The signal picker 8 connects first external circuit, and the signal picker 8 is electric current, voltage or electric potential signal collector,
The height adjustment mechanism includes slide rheostat 10 and height adjuster 7, and the height adjuster 7 connects the sliding
The slider 9 of rheostat 10, the slide rheostat 10 is perpendicularly fixed in water body and a part for the slide rheostat 10
On the water surface, the slider 9 of the slide rheostat 10 is fixedly connected with cathode fixed plate 4, is fixed in the cathode fixed plate
The cathode 1,
The slide rheostat 10 is serially connected in the second external circuit, concatenates the ammeter in second external circuit, and described
Two external circuit include DC power supply.
The length of slide rheostat is arranged according to water depth so that it is always greater than water depth.
Further, the height adjuster 7 is air bag, and the air bag is connected with two-way gas by tracheae
Pump, the air bag are set to the lower section of the slider 9.
Further, the slider 9 is also associated with clump weight.
By the inflation to air bag, it can be achieved that slider moves up, after slider reaches above the water surface, by filling
The deflation of gas air bag so that slider moves down under the action of its own gravity or clump weight gravity.
Further, the slide rheostat 10 is waterproof slide rheostat.
Further, the sensor further includes anode carrier 3, and the anode carrier is the tubular of top closure, described
Permeable hole is provided at the top of anode carrier, the anode is set in the anode carrier.Further, the anode carrier
Bottom end be inclined-plane, facilitate be inserted into deposit in.
Further, the anode or the cathode are carbon felt or graphite cake.
Further, the carbon felt thickness is 0.5cm.
Further, the material of the anode carrier is the plastic material that hardness is 60 ~ 90.
Preferably, the material of the anode carrier is polyvinyl chloride.
Further, the external resistance 5 is 100 Ω.
Further, the material of the cathode fixed plate 4 is plastics or fiberglass.
Further, the signal picker 8 and the ammeter are integral type binary channels electric current and voltmeter.
Further, the signal picker 8 connects computer, by computer analysis, change data.
Further, the water body is rivers, Hu Hai or reservoir.
The present invention second is designed to provide a kind of method monitoring water depth using the sensor, including walks as follows
Suddenly：
（1）Described device is set so that the anode is placed in water body deposit；
（2）The current signal when slider 9 is located at different location is recorded, and draws electric current-depth curve；
（3）The height of the slider 9 is adjusted by the height adjuster 7 so that the slider 9 is bottom-up along the sliding
Rheostat moves, and after slider is higher than the water surface, is adjusted by the height adjuster 7 so that and slider moves from up to down again,
During this, the signal picker 8 monitors the signal of the deposit microbiological fuel cell；Signal is increased or decreased by 0
Correspondence depth of the corresponding electric current meter reading in the electric current-depth curve, as water depth when to 0.
Preferably, constantly the moving up and down by computer program controlling cycle of height adjuster 7, you can realize to water
The real-time monitoring of body depth.
The present invention is quick on the draw this characteristic, i.e., one using the signal of microbiological fuel cell to whether cathode is placed in the water surface
Denier cathode leaves the water surface, can't accept proton, and voltage is reduced to rapidly zero.The present invention is accordingly, electric according to deposit Microbial fuel
The monitoring for the water depth that the voltage signal that cell system generates is realized.
The beneficial effects of the present invention are：
（1）The present invention builds the device of a set of real-time monitoring water depth using sediment microorganism electrochemical reaction principle.More
The blank about monitoring technology in this respect is mended.
（2）The anode part that deposit is biological fuel cell is placed in deposit by the present invention, is in anaerobic environment,
Cathode is in overlying water, on the cathode arrival water surface, does not receive electronics, current or voltage signal disappears, can pass through
Water depth is reflected in the position of the catastrophe point, to realize the monitoring to water depth；
（3）Transducer arrangement configuration of the present invention is simple, it is quick to measure, and the maintenance of device, construction and operating cost are relatively low.
Description of the drawings
Fig. 1 is the structural schematic diagram of sensor of the present invention.
Fig. 2 is that the deposit microbiological fuel cell measured by the embodiment of the present invention 1 is moved in slider in a cycle
Voltage responsive figure.
Fig. 3 is electric current-depth standards curve measured by the embodiment of the present invention 1.
Wherein, 1 is cathode, and 2 be anode, and 3 be anode carrier, and 4 be cathode fixed plate, and 5 be external resistance, and 6 be conducting wire, and 7 are
Height adjuster, 8 be signal picker, and 9 be slider, and 10 be slide rheostat.
Specific implementation mode
Below by specific embodiment, the following further describes the technical solution of the present invention.
Embodiment 1
A kind of sensor of monitoring water depth as shown in Figure 1, including deposit microbiological fuel cell, signal picker 8,
Ammeter（Not drawn in the figure）And height adjustment mechanism,
The deposit microbiological fuel cell includes cathode 1, anode 2 and external resistance 5, and the anode 2 connects institute by conducting wire 6
Cathode 1 is stated, the external resistance 5, which is serially connected on the conducting wire 6, forms the first external circuit, and the anode 2 is set to inside deposit,
The signal picker 8 connects first external circuit, and the signal picker 8 is voltage signal collector,
The height adjustment mechanism includes slide rheostat 10 and height adjuster 7, and the height adjuster 7 connects the sliding
The slider 9 of rheostat 10, the slide rheostat 10 is perpendicularly fixed in water body and a part for the slide rheostat 10
On the water surface, the slider 9 of the slide rheostat 10 is fixedly connected with cathode fixed plate 4, is fixed in the cathode fixed plate
The cathode 1,
The slide rheostat 10 is serially connected in the second external circuit, and the ammeter is concatenated in second external circuit（Do not scheming
In draw）, second external circuit includes DC power supply（Not drawn in the figure）.
The length of slide rheostat is arranged according to water depth so that it is always greater than water depth.
The height adjuster 7 is air bag, and the air bag is connected with two-way air pump by tracheae（Not in figure
It draws）, the air bag is set to the lower section of the slider 9.
The slider 9 is also associated with clump weight（Not drawn in the figure）.
The slide rheostat 10 is waterproof slide rheostat.
The sensor further includes anode carrier 3, and the anode carrier is the tubular of top closure, the anode carrier
Top is provided with permeable hole, and the anode is set in the anode carrier.
The bottom end of the anode carrier is inclined-plane, facilitates and is inserted into deposit.
The anode or the cathode are carbon felt or graphite cake.
The carbon felt thickness is 0.5cm.
The material of the anode carrier is the plastic material that hardness is 60 ~ 90.
The material of the anode carrier is polyvinyl chloride.
The external resistance 5 is 100 Ω.
The material of the cathode fixed plate 4 is plastics or fiberglass.
The signal picker 8 is integral type binary channels electric current and voltmeter with the ammeter.
The signal picker 8 connects computer（Not drawn in the figure）, by computer analysis, change data.
The water body is rivers, Hu Hai or reservoir.
The deposit in domestic Taihu Lake, the Jiangsu of 1500 g is taken to be placed in reactor, the plant being added after 1% drying and crushing is residual
Body mixes well, and 400 milliliters of simulation lake water is added later.
The sensor is set so that anode is placed in deposit.Record the electric current when slider 9 is located at different location
Signal, and draw electric current-depth curve（Fig. 3）；
By to the inflatable and deflatable of air bag so that slider floats and upwards to sinking, to realize slider on move down
It is dynamic.The air pump that computerizeds control is adopted, realizes that slider periodically moves back and forth.
Corresponding ammeter is read when being increased or decreased to 0 by 0 by the voltage measured by computer tracer signal collector
Number, and according to the electric current-depth curve drawn, feed back water depth.When slider reciprocating motion a cycle is shown in Fig. 2
The voltage responsive figure of deposit microbiological fuel cell.
Add water to change water depth as 4cm, 6cm, 8cm, which can make a response quickly.
Claims (10)
1. a kind of sensor of monitoring water depth, which is characterized in that including deposit microbiological fuel cell, signal acquisition
Device, ammeter and height adjustment mechanism,
The deposit microbiological fuel cell includes cathode, anode and external resistance, and the anode connects described the moon by conducting wire
Pole, the external resistance, which is serially connected on the conducting wire, forms the first external circuit, and the anode is set to inside deposit, the signal
Collector connects first external circuit, and the signal picker is electric current, voltage or electric potential signal collector,
The height adjustment mechanism includes slide rheostat and height adjuster, and the height adjuster connects the sliding variable resistance
The slider of device, the slide rheostat is perpendicularly fixed in water body and a part for the slide rheostat is located on the water surface,
The slider of the slide rheostat is fixedly connected with cathode fixed plate, and the cathode is fixed in the cathode fixed plate,
The slide rheostat is serially connected in the second external circuit, concatenates the ammeter in second external circuit, and described second
External circuit includes DC power supply.
2. sensor according to claim 1, which is characterized in that the height adjuster is air bag, the inflation
Air bag is connected with two-way air pump by tracheae, and the air bag is set to the lower section of the slider.
3. sensor according to claim 2, which is characterized in that the slider is also associated with clump weight.
4. sensor according to claim 1, which is characterized in that the slide rheostat is waterproof slide rheostat.
5. sensor according to claim 1, which is characterized in that the sensor further includes anode carrier, the anode
Holder is the tubular of top closure, is provided with permeable hole at the top of the anode carrier, the anode is set to the anode branch
In frame.
6. sensor according to claim 1, which is characterized in that the anode or the cathode are carbon felt or graphite cake.
7. sensor according to claim 6, which is characterized in that the carbon felt thickness is 0.5cm.
8. sensor according to claim 5, which is characterized in that the material of the anode carrier is that hardness is 60 ~ 90
Plastic material.
9. sensor according to claim 1, which is characterized in that the signal picker 8 is integrated with the ammeter
Formula binary channels electric current and voltmeter.
10. a kind of method using Sensor monitoring water depth described in claim 1-9, which is characterized in that including walking as follows
Suddenly：
（1）Described device is set so that the anode is placed in water body deposit；
（2）The current signal when slider 9 is located at different location is recorded, and draws electric current-depth curve；
（3）The height of the slider 9 is adjusted by the height adjuster 7 so that the slider 9 is bottom-up along the sliding
Rheostat moves, and after slider is higher than the water surface, is adjusted by the height adjuster 7 so that and slider moves from up to down again,
During this, the signal picker 8 monitors the signal of the deposit microbiological fuel cell；Signal is increased or decreased by 0
Correspondence depth of the corresponding electric current meter reading in the electric current-depth curve, as water depth when to 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810452075.1A CN108775858B (en) | 2018-05-12 | 2018-05-12 | Sensor for monitoring depth of water body and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810452075.1A CN108775858B (en) | 2018-05-12 | 2018-05-12 | Sensor for monitoring depth of water body and application method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108775858A true CN108775858A (en) | 2018-11-09 |
| CN108775858B CN108775858B (en) | 2024-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114041347A (en) * | 2021-11-09 | 2022-02-15 | 繁昌县雄风家庭农场 | Distributed uniform fertilizing device for lotus seed planting and fertilizing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967181A (en) * | 1988-09-12 | 1990-10-30 | Yazaki Corporation | Fuel level gauge provided with an apparatus for issuing a warning on the amount of remaining fuel |
| JP2009008650A (en) * | 2007-05-31 | 2009-01-15 | Yazaki Corp | Liquid level detecting apparatus and design method of same |
| CN101607781A (en) * | 2009-07-17 | 2009-12-23 | 广东省生态环境与土壤研究所 | A kind of microbiological cell device and municipal sludge disposal method |
| CN101710626A (en) * | 2009-11-12 | 2010-05-19 | 南京大学 | Single-chamber microbial fuel cell and application thereof in wastewater treatment |
| CN101962232A (en) * | 2010-10-26 | 2011-02-02 | 中国科学院南京地理与湖泊研究所 | Sediment microorganism electrochemical device and application thereof |
| US20140260602A1 (en) * | 2013-03-18 | 2014-09-18 | Hon Hai Precision Industry Co., Ltd. | Water-level detecting system and water-level detecting method |
| CN206523798U (en) * | 2017-03-07 | 2017-09-26 | 杭州杭景模型有限公司 | The water surface Light Control Unit of sand table model |
| CN108007983A (en) * | 2017-12-29 | 2018-05-08 | 环境保护部南京环境科学研究所 | Utilize the apparatus and method of microbiological fuel cell evaluating water quality organic contamination situation |
| CN208155256U (en) * | 2018-05-12 | 2018-11-27 | 中国科学院南京地理与湖泊研究所 | A kind of sensor monitoring water depth |
-
2018
- 2018-05-12 CN CN201810452075.1A patent/CN108775858B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967181A (en) * | 1988-09-12 | 1990-10-30 | Yazaki Corporation | Fuel level gauge provided with an apparatus for issuing a warning on the amount of remaining fuel |
| JP2009008650A (en) * | 2007-05-31 | 2009-01-15 | Yazaki Corp | Liquid level detecting apparatus and design method of same |
| CN101607781A (en) * | 2009-07-17 | 2009-12-23 | 广东省生态环境与土壤研究所 | A kind of microbiological cell device and municipal sludge disposal method |
| CN101710626A (en) * | 2009-11-12 | 2010-05-19 | 南京大学 | Single-chamber microbial fuel cell and application thereof in wastewater treatment |
| CN101962232A (en) * | 2010-10-26 | 2011-02-02 | 中国科学院南京地理与湖泊研究所 | Sediment microorganism electrochemical device and application thereof |
| US20140260602A1 (en) * | 2013-03-18 | 2014-09-18 | Hon Hai Precision Industry Co., Ltd. | Water-level detecting system and water-level detecting method |
| CN206523798U (en) * | 2017-03-07 | 2017-09-26 | 杭州杭景模型有限公司 | The water surface Light Control Unit of sand table model |
| CN108007983A (en) * | 2017-12-29 | 2018-05-08 | 环境保护部南京环境科学研究所 | Utilize the apparatus and method of microbiological fuel cell evaluating water quality organic contamination situation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114041347A (en) * | 2021-11-09 | 2022-02-15 | 繁昌县雄风家庭农场 | Distributed uniform fertilizing device for lotus seed planting and fertilizing method thereof |
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| CN108775858B (en) | 2024-08-16 |
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