Fertilizer supply device and fertilizer supply method

Abstract

The present invention provides a fertilizer supply device comprising a supply pipe having an opening for supplying fertilizer to aquatic products intended for aquaculture underwater, and a fertilizer dispenser connected to the supply pipe for supplying fertilizer to the supply pipe. In the above fertilizer supply device, the supply pipe has at least one of the openings provided for each of a plurality of depths in the water, and the aquatic products may be secured near the at least one opening provided for each of the plurality of depths.

Description

Technical Field

[0001] The present disclosure relates to a fertilizer supply device and a fertilizer supply method.

Background Art

[0002] Patent Document 1 describes "a method for culturing oysters or scallops, characterized by installing a fertilization container storing fertilizer in a suspended culture farm" (paragraph 0006). [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent Application Laid-Open No. H23-115183

Summary of the Invention

[0003] (1) In a first aspect of the present disclosure, there is provided a fertilizer supply device including a supply pipe provided with an opening for supplying fertilizer to an aquaculture target aquatic product in water, and a fertilizer supply device connected to the supply pipe and supplying fertilizer to the supply pipe.

[0004] (2) In the fertilizer supply device of (1) above, the supply pipe has at least one opening provided for each of a plurality of depths in water, and the aquatic product may be locked in the vicinity of the at least one opening provided for each of the plurality of depths.

[0005] (3) In the fertilizer supply device of (1) or (2) above, the opening may be provided in the direction of the aquatic product.

[0006] (4) In any one of the fertilizer supply devices of (1) to (3) above, the plurality of supply pipes may be provided in different directions with respect to the aquatic product in a horizontal plane.

[0007] (5) In the fertilizer supply device of (4) above, the fertilizer supply device may switch the supply pipe that supplies fertilizer among the plurality of supply pipes according to the water flow.

[0008] (6) In any of the fertilizer supply devices described in (1) to (5) above, the supply pipe may be used to secure the aquatic products to its outer surface.

[0009] (7) Any of the fertilizer supply devices described in (1) to (6) above further comprises a water intake pipe for drawing up low-lying water, and the water intake pipe may supply the low-lying water to the supply pipe as fertilizer.

[0010] (8) In the fertilizer supply device described in (7) above, the supply pipe may be shorter than the intake pipe.

[0011] (9) In any of the fertilizer supply devices described in (1) to (8) above, the supply pipe has an intake port for drawing in low-level water at a location deeper than the opening in the water, and the fertilizer supply device may pump up the low-level water through the supply pipe and discharge the low-level water from the opening of the supply pipe.

[0012] (10) In any of the fertilizer supply devices described in (1) to (9) above, the size of the at least one opening or the distribution of the at least one opening may differ depending on the depth in the water.

[0013] (11) The fertilizer supply device according to claim 1, wherein the fertilizer supply device is installed on water, in any of the above (1) to (10).

[0014] A second aspect of this disclosure provides a fertilizer supply method comprising supplying fertilizer to a supply pipe and supplying fertilizer to aquatic products being cultivated in water through an opening provided in the supply pipe.

[0015] A third aspect of the present disclosure provides a floating structure comprising a supply pipe having an opening for supplying fertilizer to aquatic products to be cultivated in water, a fertilizer dispenser connected to the supply pipe and supplying fertilizer to the supply pipe, an intake pipe for drawing up bottom water, and a rope, wherein the aquatic products are secured to the rope, the supply pipe, or the intake pipe.

[0016] It should be noted that the above summary of the invention does not enumerate all of its features. Furthermore, subcombinations of these features may also constitute an invention. [Brief explanation of the drawing]

[0017] [Figure 1] The configuration of the fertilizer supply device 100 according to this embodiment is shown together with the floating structure 150 and the rope 115. [Figure 2] This diagram shows the operation flow of the fertilizer supply device 100 according to this embodiment. [Figure 3] The configuration of the fertilizer supply device 300 according to the first modified example of this embodiment is shown together with the floating structure 150. [Figure 4] The configuration of the fertilizer supply device 400 according to a second modification of this embodiment is shown together with the floating structure 150. [Figure 5] The configuration of the fertilizer supply device 500 according to a third modified example of this embodiment is shown together with the floating structure 150. [Modes for carrying out the invention]

[0018] The present invention will be described below through embodiments of the invention, but these embodiments are not intended to limit the invention as defined in the claims. Furthermore, not all combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0019] Figure 1 shows the configuration of the fertilizer supply device 100 according to this embodiment, along with the floating structure 150 and the rope 115. The floating structure 150, the rope 115, and the fertilizer supply device 100 are used for cultivating aquatic products 110. The aquatic products 110 are the aquatic products that are cultivated using the fertilizer supply device 100, the floating structure 150, and the rope 115. Here, the aquatic products 110 may be at least one of oysters, scallops, pearl oysters, clams, cockles, and other shellfish.

[0020] The floating structure 150 is a floating structure that floats on the water surface. The floating structure 150 is used to install or fix the fertilizer supply device 100 and the rope 115. The floating structure 150 may install or fix at least a part of the components of the fertilizer supply device 100. The floating structure 150 is not particularly limited as long as it is made of a material that floats on the water surface 160. For example, the floating structure 150 may be a raft. The floating structure 150 has a first surface positioned above the water surface 160 and a second surface that is in contact with the water surface 160 or positioned below the water surface 160. The floating structure 150 may have a rectangular or other shape. The floating structure 150 may be plate-shaped and may be formed from a plurality of plate-shaped or rod-shaped objects (floating bodies, etc.). In addition, an underwater structure fixed to the seabed or bottom and extending toward the water surface may be used instead of the floating structure 150. Furthermore, the floating structure 150 may be considered a structure that includes, in addition to the floating structure 150 itself, at least one of the following components: a rope 115, a supply pipe 120, a fertilizer dispenser 130, a measuring instrument 135, and a storage container 140.

[0021] One end of the rope 115 is connected to the second surface of the floating structure 150. The rope 115 is a string-like object for securing the fishery products 110. The rope 115 may be flexible. A rod-shaped object that is not easily bent may be used instead of the rope 115. The rope 115 may secure the fishery products 110 in an area shallower than 10m.

[0022] The fertilizer supply device 100 is a device that supplies fertilizer to the aquaculture target aquatic product 110 placed in water such as seawater. Generally, the food for the aquatic product 110 is phytoplankton. Nutrient salts, which are one of the growth factors of phytoplankton, are present in the smallest amounts in the surface layer of the water, and their amounts increase as the water depth increases. Therefore, when cultivating the aquatic product 110 in the surface layer of the water, by supplying fertilizer that promotes the reproduction of phytoplankton and the like, which serve as food for the aquatic product 110, such as nutrient salts, to the aquatic product 110, the growth of the aquatic product 110 can be promoted. The fertilizer supply device 100 includes one or more supply pipes 120, a fertilizer feeder 130, a measuring device 135, and a storage container 140.

[0023] The supply pipe 120 is a passage for flowing fluid (liquid) fertilizer. In the example of this figure, one end of the supply pipe 120 is connected to the fertilizer feeder 130, and the fertilizer supplied from the fertilizer feeder 130 flows toward the other end side. At least a part of the supply pipe 120 may be installed in the water. The supply pipe 120 may be a pipe having a fixed shape or a flexible tube. As an example, the supply pipe 120 may be formed of polyvinyl chloride resin or other resins. The supply pipe 120 may be provided such that the downstream end is at a lower position than the upstream end so that the fertilizer flows from the upstream to the downstream by gravity. As an example, the supply pipe 120 may be provided substantially vertically. The supply pipe 120 may have a constant cross-sectional area in the longitudinal direction. The supply pipe 120 may have a circular or polygonal cross-section. The supply pipe 120 may be provided with one or more openings 125. The supply pipe 120 does not necessarily have to have an opening at the downstream end. A weight may be connected to the downstream end of the supply pipe 120.

[0024] When a plurality of supply pipes 120 are provided, the plurality of supply pipes 120 may be provided in different directions with respect to the aquatic product 110 in the horizontal plane. For example, four supply pipes 120 may be provided at intervals of 90° with respect to the aquatic product 110 in the horizontal plane. By providing the plurality of supply pipes 120 in different directions with respect to the aquatic product 110 in the horizontal plane, the fertilizer supply device 100 can supply fertilizer near the aquatic product 110 regardless of the direction of the tidal current.

[0025] One or more openings 125 are openings for supplying fertilizer to the aquaculture target aquatic product 110 in water. The opening 125 is not particularly limited as long as it has a size through which the fertilizer can pass. When a plurality of openings 125 are provided, each of the openings 125 may have the same size or may have different sizes. The one or more openings 125 may be provided in a portion of the supply pipe 120 installed in water. The plurality of openings 125 may be provided for each of a plurality of depths in water. In this case, the aquatic product 110 may be locked near at least one opening 125 provided for each of the plurality of depths. By locking the aquatic product 110 near the opening 125, the supply pipe 120 can efficiently supply fertilizer to the aquatic product 110. The opening 125 may be provided regularly or irregularly. As an example, a group consisting of a plurality of openings 125 may be provided regularly or irregularly. In the example of this figure, a group consisting of eight openings 125 is provided at regular intervals. The opening 125 may be provided in the direction of the aquatic product 110. By providing the opening 125 in the direction of the aquatic product 110, the supply pipe 120 can efficiently supply fertilizer to the aquatic product 110.

[0026] The size or distribution of the one or more openings 125 of the supply pipe 120 may differ according to the depth in water. For example, the size of the opening 125 of the supply pipe 120 may increase as the depth in water becomes deeper. When a group consisting of a plurality of openings 125 is provided, the number of openings 125 in each group of the supply pipe 120 may differ according to the depth in water. For example, the number of openings 125 in one group of the supply pipe 120 may increase as the depth in water becomes deeper. According to such a supply pipe 120, it is possible to keep, for example, the amount of fertilizer released at locations with different depths in water, that is, locations with different water pressures, to be about the same.

[0027] The storage container 140 is provided on the first surface of the floating structure 150. The storage container 140 is a container for storing fertilizer raw materials. The storage container 140 may store liquid or solid raw materials. In this embodiment, the storage container 140 may store liquid or solid materials containing nutrients (nitrogen or phosphorus) as fertilizer raw materials. The storage container 140 may be refillable with raw materials. The storage container 140 may be installed on the water. By installing the storage container 140 on the water, fertilizer raw materials can be refilled without lifting the storage container 140 out of the water.

[0028] The fertilizer dispenser 130 is installed on the first surface of the floating structure 150. The fertilizer dispenser 130 is connected to one or more supply pipes 120 and a storage container 140. The fertilizer dispenser 130 receives fertilizer raw materials from the storage container 140. The fertilizer dispenser 130 may collect water from the vicinity. The fertilizer dispenser 130 may mix the fertilizer raw materials received from the storage container 140 with the water to prepare fertilizer to be supplied to the aquatic products 110. The fertilizer dispenser 130 supplies fertilizer to the supply pipes 120. The fertilizer dispenser 130 may be installed on the water. By installing the fertilizer dispenser 130 on the water, deterioration and damage due to components contained in the water and water flow can be prevented. Since the storage container 140 for supplying fertilizer raw materials to the fertilizer dispenser 130 is also installed on the water when the fertilizer dispenser 130 is installed on the water, fertilizer replenishment becomes easier.

[0029] The measuring instrument 135 is connected to the fertilizer dispenser 130. The measuring instrument 135 may be connected to the fertilizer dispenser 130 by a rope or the like. The measuring instrument 135 may be able to communicate with the fertilizer dispenser 130 via a cable or wireless network. The measuring instrument 135 measures the direction of water flow near the rope 115 or the supply pipe 120. The measuring instrument 135 may be installed underwater or on the water surface 160. The measuring instrument 135 may have a float and measure the direction of water flow from the direction in which the float is drifting. The measuring instrument 135 may have an image sensor and measure the direction in which the float is drifting using the image sensor. The measuring instrument 135 may also be a tidal current meter.

[0030] Figure 2 shows the operation flow of the fertilizer supply device 100 according to this embodiment. In step 210 (S210), the measuring instrument 135 measures the direction of the water flow. The measuring instrument 135 may transmit the measured direction of the water flow to the fertilizer supply device 130.

[0031] In step S220, the fertilizer supplier 130 switches which of the multiple supply pipes 120 to supply fertilizer according to the water flow. For example, the fertilizer supplier 130 may select a supply pipe 120 installed upstream of the water flow as the supply pipe 120 to supply fertilizer, and supply fertilizer to the selected supply pipe 120 while not supplying fertilizer to the unselected supply pipes 120. By switching which supply pipe 120 to supply fertilizer according to the water flow, the fertilizer supply device 100 can efficiently supply fertilizer to the aquatic products 110.

[0032] In S230, the fertilizer dispenser 130 supplies fertilizer to the supply pipe 120. In S240, the fertilizer supply device 100 supplies fertilizer to the aquatic products 110 being cultivated in water through an opening 125 provided in the supply pipe 120.

[0033] In conventional technology, containers holding fertilizer were placed at various locations underwater, making it difficult to determine the remaining amount of fertilizer, and requiring the containers to be lifted out of the water to replace the fertilizer. With the fertilizer supply device 100 described above, fertilizer is supplied through the opening 125 of the supply pipe 120, thus reducing costs compared to the case where containers holding fertilizer are placed underwater.

[0034] Figure 3 shows the configuration of the fertilizer supply device 300 according to the first modified example of this embodiment, together with the floating structure 150. The floating structure 150 may be the same as that in Figure 1. The fertilizer supply device 300 comprises aquatic products 110, a supply pipe 310, a fertilizer dispenser 130, and a storage container 140. Since the fertilizer supply device 300 is a modified example of the fertilizer supply device 100 shown in Figure 1, the explanation will be omitted below except for the differences.

[0035] The supply pipe 310 is a passage for flowing fertilizer. The supply pipe 310 has one or more openings 125. The supply pipe 310 also functions as the rope 115 in Figure 1, securing the aquatic products 110 to its outer surface. The supply pipe 310 may secure the aquatic products 110 near the openings 125. In other respects, the supply pipe 310 may be the same as the supply pipe 120 in Figure 1. With the fertilizer supply device 300 described above, since the supply pipe 310 secures the aquatic products 110 to its outer surface, the distance between the openings 125 and the aquatic products 110 becomes shorter, and fertilizer can be efficiently supplied to the aquatic products 110.

[0036] Furthermore, the floating structure 150 shown in Figure 3 may be considered a structure that includes, in addition to the floating structure 150 itself, at least one of the following components: a supply pipe 310, a fertilizer dispenser 130, and a storage container 140.

[0037] Figure 4 shows the configuration of a fertilizer supply device 400 according to a second modification of this embodiment, together with a floating structure 150. The floating structure 150 may be the same as that in Figure 1. The fertilizer supply device 400 comprises a water intake pipe 410, a supply pipe 420, and a fertilizer dispenser 130. Since the fertilizer supply device 400 is a modification of the fertilizer supply device 100 shown in Figure 1, the explanation will be omitted below except for the differences.

[0038] The intake pipe 410 is connected to the fertilizer supply unit 130. The intake pipe 410 draws up bottom-water. Here, bottom-water may be water located deeper than the position where the marine products are fixed. For example, bottom-water may be water at a depth of 50m or more, water below the euphotic zone, or water near the seabed. The intake pipe 410 may be installed approximately vertically. The intake pipe 410 has an intake port 415. The intake pipe 410 may have an intake port 415 at its lower end, or it may have an intake port at a location other than the lower end. The intake pipe 410 may draw up bottom-water from the intake port 415. The intake pipe 410 supplies the drawn-up bottom-water to the fertilizer supply unit 130. Therefore, the intake pipe 410 supplies bottom-water as fertilizer to the supply pipe 420 via the fertilizer supply unit 130.

[0039] The supply pipe 420 is connected to the fertilizer dispenser 130. The supply pipe 420 is a channel for carrying low-sea water. The supply pipe 420 may be shorter than the intake pipe 410. Therefore, the supply pipe 420 may have its downstream end at a shallower location than the lower end of the intake pipe 410. The supply pipe 420 may have one or more openings 125 at a shallower location than the intake port 415 of the intake pipe 410. With such a supply pipe 420, the deep-sea water drawn up by the intake pipe 410 can be supplied to a location shallower than the location from which the deep-sea water was drawn up, and to a location with fewer nutrients. The supply pipe 420 may have aquatic products attached to its outer surface, as in Figure 2. Alternatively, the fertilizer dispenser 400 may be equipped with a rope or the like, which may attach the aquatic products. The supply pipe 420 may be otherwise the same as the supply pipe 120 in Figure 1.

[0040] Furthermore, the floating structure 150 shown in Figure 4 may be considered a structure comprising, in addition to the floating structure 150 itself, at least one of the following components: a supply pipe 510, a fertilizer dispenser 130, and a rope. In this case, aquatic products may be secured to the rope or the supply pipe 510.

[0041] According to the fertilizer supply device 400 described above, by using deep-sea water as fertilizer, fertilizer replenishment becomes unnecessary, and operating costs can be reduced.

[0042] Figure 5 shows the configuration of a fertilizer supply device 500 according to a third modification of this embodiment, together with a floating structure 150. The floating structure 150 may be the same as that in Figure 1. The fertilizer supply device 500 comprises a supply pipe 510 and a fertilizer dispenser 130. Since the fertilizer supply device 500 is a modification of the fertilizer supply device 100 shown in Figure 1, the explanation will be omitted below except for the differences.

[0043] The supply pipe 510 is connected to the fertilizer dispenser 130. The supply pipe 510 pumps up the bottom water and supplies the pumped-up bottom water to the aquaculture products. The supply pipe 510 may be a single-walled or double-walled pipe. The supply pipe 510 may have internal partitions. The supply pipe 510 has one or more openings 125. The supply pipe 510 has an intake port 515 that draws in bottom water at a depth greater than the openings 125 in the water. Therefore, the fertilizer dispenser 130 pumps up the bottom water through the supply pipe 510 and discharges the bottom water from the openings 125 of the supply pipe 510. If the supply pipe 510 is a double-walled pipe, the fertilizer dispenser 130 may pump the bottom water up to near the water surface 160 through the inner pipe of the supply pipe 510, flow the bottom water into the outer pipe of the supply pipe 510, and discharge the bottom water from the openings 125. If the supply pipe 510 has a partition wall inside, the fertilizer dispenser 130 may pump the low-level water up to near the water surface 160 through one region of the supply pipe 510 separated by the partition wall, flow the low-level water into the other region of the supply pipe 510 separated by the partition wall, and discharge the low-level water from the opening 125. If the supply pipe 510 is a single pipe, the fertilizer dispenser 130 may pump the low-level water drawn in from the intake port 515 upward and discharge a portion of the low-level water from each opening 125 along the supply pipe 510. The supply pipe 510 may have marine products attached to its outer surface, as in Figure 2. Alternatively, the fertilizer supply device 500 may be equipped with a rope or the like, which will attach the marine products. The supply pipe 510 may be otherwise the same as the supply pipe 120 in Figure 1.

[0044] Furthermore, the floating structure 150 shown in Figure 5 may be considered a structure that includes, in addition to the floating structure 150 itself, at least one of the following components: a supply pipe 310, a fertilizer dispenser 130, and a storage container 140.

[0045] According to the fertilizer supply device 500 described above, by using deep-sea water as fertilizer, fertilizer replenishment becomes unnecessary, and operating costs can be reduced.

[0046] Various embodiments of the present invention may be described with reference to flowcharts and block diagrams, where a block may represent (1) a stage in a process in which an operation is performed or (2) a section of a device having the role of performing the operation. Specific stages and sections may be implemented by dedicated circuits, programmable circuits supplied with computer-readable instructions stored on a computer-readable medium, and / or processors supplied with computer-readable instructions stored on a computer-readable medium. Dedicated circuits may include digital and / or analog hardware circuits, and may include integrated circuits (ICs) and / or discrete circuits. Programmable circuits may include reconfigurable hardware circuits, including logical AND, logical OR, logical XOR, logical NAND, logical NOR, and other logic operations, flip-flops, registers, memory elements such as field-programmable gate arrays (FPGAs), programmable logic arrays (PLAs), etc.

[0047] Computer-readable media may include any tangible device capable of storing instructions to be executed by a suitable device, and as a result, computer-readable media having instructions stored therein will comprise a product containing instructions that can be executed to create means for performing operations specified in a flowchart or block diagram. Examples of computer-readable media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, etc. More specific examples of computer-readable media may include floppy disks, diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), electrically erasable programmable read-only memory (EEPROM), static random access memory (SRAM), compact disk read-only memory (CD-ROM), digital multipurpose disc (DVD), Blu-ray® disc, memory stick, integrated circuit card, etc.

[0048] Computer-readable instructions may include assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk®, Java®, C++, and traditional procedural programming languages ​​such as the C programming language or similar programming languages.

[0049] Computer-readable instructions may be provided locally or via a wide area network (WAN) such as a local area network (LAN) or the internet to the processor or programmable circuit of a programmable data processing device such as a general-purpose computer, a special-purpose computer, or another computer, and may be executed to create means for performing operations specified in a flowchart or block diagram. Here, the computer may be a PC (personal computer), a tablet computer, a smartphone, a workstation, a server computer, a general-purpose computer, or a special-purpose computer, and may also be a computer system in which multiple computers are connected. Such a computer system in which multiple computers are connected is also called a distributed computing system and is a computer in a broad sense. In a distributed computing system, multiple computers execute a program by having each computer execute a part of the program and by passing data during program execution between computers as needed.

[0050] Examples of processors include computer processors, central processing units (CPUs), processing units, microprocessors, digital signal processors, controllers, and microcontrollers. A computer may have one or more processors. In a multiprocessor system with multiple processors, each processor executes a portion of the program, and the processors collectively execute the program by passing program execution data between them as needed. For example, in the execution of multitasking, each of the multiple processors may execute a portion of each task in small chunks by switching tasks at each time slice. In this case, which part of a program each processor executes changes dynamically. Which part of a program each of the multiple processors executes may also be statically determined by multiprocessor-aware programming.

[0051] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. It will be clear from the claims that such modified or improved forms may also be included in the technical scope of the present invention.

[0052] It should be noted that the execution order of operations, procedures, steps, and stages in the apparatus, systems, programs, and methods shown in the claims, specifications, and drawings is not explicitly stated as "before," "prior to," etc., and that these can be implemented in any order unless the output of a previous process is used in a later process. Even if the operation flow in the claims, specifications, and drawings is described using phrases such as "first," "next," etc. for convenience, it does not mean that it is essential to perform the operations in that order. [Explanation of symbols]

[0053] 100 Fertilizer supply device, 110 Aquatic products, 115 Rope, 120 Supply pipe, 125 Opening, 130 Fertilizer dispenser, 135 Measuring instrument, 140 Storage container, 150 Water structure, 160 Water surface, 300 Fertilizer supply device, 310 Supply pipe, 400 Fertilizer supply device, 410 Water intake pipe, 415 Inlet, 420 Supply pipe, 500 Fertilizer supply device, 510 Supply pipe, 515 Inlet

Claims

1. A supply pipe having an opening for supplying fertilizer to aquatic products being farmed in water, A fertilizer dispenser connected to the supply pipe and supplying fertilizer to the supply pipe, A fertilizer supply device equipped with the following features.

2. The aforementioned supply pipe is Having at least one of the openings provided for each of the multiple depths in the water, The aquatic products are secured near the at least one opening provided for each of the plurality of depths. The fertilizer supply device according to claim 1.

3. The fertilizer supply device according to claim 1, wherein the opening is provided in the direction of the aquatic products.

4. The supply pipes are provided in multiple locations. The fertilizer supply device according to claim 1, wherein the plurality of supply pipes are arranged in different directions relative to the aquatic products in the horizontal plane.

5. The fertilizer supply device according to claim 4, wherein the fertilizer supply device switches the supply pipe that supplies fertilizer from among the plurality of supply pipes according to the water flow.

6. The fertilizer supply device according to claim 1, wherein the supply pipe has an outer surface that secures the aquatic products.

7. It is further equipped with an intake pipe to draw up water from the lower levels. The fertilizer supply device according to claim 1, wherein the intake pipe supplies the low-lying water as fertilizer to the supply pipe.

8. The fertilizer supply device according to claim 7, wherein the supply pipe is shorter than the intake pipe.

9. The supply pipe has an intake port that draws in lower-level water at a location deeper than the opening in the water. The fertilizer dispenser pumps up the low-lying water through the supply pipe and discharges the low-lying water from the opening of the supply pipe. The fertilizer supply device according to claim 1.

10. The fertilizer supply device according to claim 2, wherein the size of the at least one opening or the distribution of the at least one opening differs depending on the depth in the water of the supply pipe.

11. The fertilizer supply device according to claim 1, wherein the fertilizer supply device is installed on the water.

12. Supplying fertilizer to the supply pipe, The supply pipe is used to supply fertilizer to aquatic products being cultivated in water through an opening provided in the supply pipe. A fertilizer supply method comprising the following features.

13. A supply pipe having an opening for supplying fertilizer to aquatic products being farmed in water, A fertilizer dispenser connected to the supply pipe and supplying fertilizer to the supply pipe, A water intake pipe that draws up water from the lower levels, rope and A floating structure equipped with, A floating structure to which the aquatic products are attached to the rope, the supply pipe, or the intake pipe.

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