Fertilizer for seaweed, seaweed cultivation facility equipped with the same, method for manufacturing fertilizer for seaweed, and method for cultivating seaweed

Abstract

Provided are a fertilizer material for seaweed that enables easy and inexpensive fertilization and topdressing of seaweed, and also enables enhancement of the strength and reuse of ropes for aquaculture, an aquaculture facility for seaweed equipped with the same, a method for producing the fertilizer material for seaweed, and a method for culturing seaweed. 【Solution means】The fertilizer material 1 for seaweed according to the present invention is a fertilizer material 1 for seaweed for fertilizing seaweed, and contains raw rubber and shell powder obtained by pulverizing the shells of marine organisms, and is formed in a sheet shape or a string shape. The shell powder may be powder of sea urchin shells, and may further contain iron fulvate.

Description

Technical Field

[0001] The present invention relates to a fertilizer for seaweed using shell powder such as sea urchin shells, an aquaculture facility for seaweed equipped with the same, a method for producing the fertilizer for seaweed, and a method for cultivating seaweed.

Background Art

[0002] Conventionally, techniques for cultivating seaweed such as kelp have been proposed. For example, Japanese Patent Application Laid-Open No. 2004-33174 discloses a method for cultivating a laminariaceae plant by vertically installing a rope having spores of a laminariaceae plant in the sea (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in conventional cultivation methods including the invention described in Patent Document 1, nutrients necessary for the growth of seaweed tend to be insufficient. Therefore, in recent years, attempts have been made to mix sea urchin shells containing nutrients such as nitrogen and phosphorus with latex (sap of the rubber tree), soak the mixed solution into the ropes as described above, or install the dried mixed solution on the seabed as a fertilizer.

[0005] However, once the rope used for aquaculture soaks up the mixture, the latex solidifies and cannot soak it up again. Therefore, nutrients cannot be top-dressed later, and the rope that has been used once cannot be reused, resulting in the problem of being disposable. Also, for ropes with high strength such as nylon ropes, since the mixture has difficulty soaking in, there is also the problem that a cotton rope with low strength has to be used. Furthermore, since the latex and cotton ropes used in the mixture are expensive, there is also the problem of increased costs. Also, simply drying the mixture makes it brittle and easy to break, making it difficult to handle.

[0006] The present invention has been made to solve such problems, and an object thereof is to provide a fertilizer for seaweed that can easily and inexpensively fertilize and top-dress seaweed, can increase the strength of aquaculture ropes and enable reuse, a seaweed aquaculture facility equipped with the same, a method for manufacturing the fertilizer for seaweed, and a method for cultivating seaweed.

Means for Solving the Problems

[0007] The fertilizer for seaweed according to the present invention is a fertilizer for seaweed for fertilizing seaweed, which can easily and inexpensively fertilize and top-dress seaweed, and can solve the problem of increasing the strength of aquaculture ropes and enabling reuse. It contains raw rubber and shell powder obtained by pulverizing the shells of marine organisms, and is formed in a sheet shape or a string shape.

[0008] Also, as an aspect of the present invention, in order to effectively utilize the sea urchin shells that are waste and solve the problem of protecting seaweed from sea urchins that are enemies of seaweed, the shell powder may be powder of sea urchin shells.

[0009] Furthermore, as an aspect of the present invention, in order to solve the problem of promoting the growth of seaweed, it may further contain iron fulvate.

[0010] The seaweed cultivation facility according to the present invention has a cultivation rope holding seaweed seedlings in order to solve the problems of being able to fertilize and top-dress seaweed simply and inexpensively, and also strengthening and reusing the cultivation rope. In the cultivation rope, a seaweed fertilizer of any of the above-described modes is fixed at a position near the seedlings.

[0011] Also, as one aspect of the present invention, in order to solve the problem of appropriately fixing the seaweed fertilizer to the cultivation rope according to the shape of the seaweed fertilizer, when the seaweed fertilizer is formed in a sheet shape, the seaweed fertilizer is wound around the cultivation rope in a cylindrical shape and fixed. When the seaweed fertilizer is formed in a string shape, the seaweed fertilizer may be wound around the cultivation rope in a spiral shape or fixed by being sandwiched between the meshes of the cultivation rope.

[0012] Furthermore, as one aspect of the present invention, in order to solve the problem of facilitating the crimping of the sheet-shaped seaweed fertilizer, when the seaweed fertilizer is formed in a sheet shape, an adhesive sheet containing the raw rubber and the shell powder and having a lower content of the shell powder than the seaweed fertilizer may be interposed and fixed at the end of the seaweed fertilizer wound around the cultivation rope.

[0013] The method for manufacturing a seaweed fertilizer according to the present invention is a method for manufacturing a seaweed fertilizer for fertilizing seaweed, in order to solve the problem of manufacturing a seaweed fertilizer that can fertilize and top-dress seaweed simply and inexpensively, and can also strengthen and reuse the cultivation rope. The method includes a raw rubber kneading step of kneading raw rubber with an open roll machine, a shell powder kneading step of adding and kneading shell powder obtained by pulverizing the shells of marine organisms into the kneaded raw rubber, and a seaweed fertilizer forming step of forming the kneaded raw rubber and the shell powder into a sheet shape or a string shape.

[0014] Also, as one aspect of the present invention, in order to solve the problem of promoting the growth of seaweed, in the shell powder kneading step, ferric fulvate may be further added and kneaded.

[0015] The seaweed cultivation method according to the present invention is a seaweed cultivation method using a cultivation rope holding seaweed seedlings in order to solve the problems of being able to fertilize and top-dress seaweed simply and inexpensively, and also enhancing the strength and reusing the cultivation rope. The method has a step of fixing a seaweed fertilizer of any of the above-described aspects at a position near the seedlings on the cultivation rope.

[0016] Also, as an aspect of the present invention, in order to solve the problem of appropriately fixing the seaweed fertilizer to the cultivation rope according to the shape of the seaweed fertilizer, when the seaweed fertilizer is formed in a sheet shape, in the step of fixing the seaweed fertilizer, after winding the seaweed fertilizer around the cultivation rope in a cylindrical shape, its end is fixed by crimping. When the seaweed fertilizer is formed in a string shape, in the step of fixing the seaweed fertilizer, the seaweed fertilizer may be wound around the cultivation rope in a spiral shape and fixed, or the seaweed fertilizer may be sandwiched between the meshes of the cultivation rope and fixed.

[0017] Furthermore, as an aspect of the present invention, in order to solve the problem of facilitating crimping of the sheet-shaped seaweed fertilizer, when the seaweed fertilizer is formed in a sheet shape, in the step of fixing the seaweed fertilizer, an adhesive sheet containing the raw rubber and the shell powder and having a lower content of the shell powder than the seaweed fertilizer may be interposed at the end of the seaweed fertilizer and crimped.

Advantages of the Invention

[0018] According to the present invention, it is possible to fertilize and top-dress seaweed simply and inexpensively, and also enhance the strength and reuse the cultivation rope.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

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Figure 7

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of a fertilizer for seaweed according to the present invention, a seaweed cultivation facility equipped with the same, a method for manufacturing the fertilizer for seaweed, and a method for cultivating seaweed will be described with reference to the drawings.

[0021] [1] Fertilizer for Seaweed The fertilizer for seaweed 1 of this embodiment is for fertilizing seaweed, and mainly contains raw rubber, shell powder obtained by pulverizing the shells of marine organisms, and iron fulvate, and is formed in a sheet shape or a string shape.

[0022] In the present invention, seaweed includes all algae that grow in the sea, such as kombu and wakame, and in this embodiment, kombu is the target. Also, raw rubber is obtained by collecting, purifying, coagulating, and drying latex (the sap of the rubber tree) and is not vulcanized. Furthermore, the shells of marine organisms include the shells and spines of sea urchins, the shells of scallops such as scallops, and the soft shells of squids, etc., and contain nitrogen, phosphorus, etc. that are nutrients for seaweed. In this embodiment, sea urchin shells are used.

[0023] In the present invention, the sheet shape refers to a thin and flat shape, and for example, it can have dimensions such as a width of 100 mm × a length of 210 mm × a thickness of 2.5 mm. The string shape refers to an elongated shape such as a ribbon or a line, and it can have an arbitrary length according to the usage form. However, the size of the fertilizer for seaweed 1 is not limited as long as it is a size that can be easily held by the aquaculture rope described later.

[0024] In this embodiment, fulvic acid iron is produced by putting bark compost obtained by fermenting bark and steel wool (steel wool) into hot water and boiling it down to obtain an aqueous solution of fulvic acid iron, and impregnating this into the bark compost and drying it.

[0025] [2] Method for manufacturing fertilizer for seaweed Next, the manufacturing method of the fertilizer for seaweed 1 of this embodiment will be described with reference to FIG. 1. First, lumps of raw rubber are put into an open roll machine and kneaded (step S1: raw rubber kneading step). As a result, the raw rubber becomes smooth and soft, making it easier to mix the shell powder. The open roll machine is a machine that rotates two large rollers in opposite directions and kneads the material while sandwiching it between the rollers.

[0026] Next, when the raw rubber kneaded in the raw rubber kneading step becomes smooth, shell powder is added to the raw rubber and kneaded by an open roll machine (step S2: shell powder kneading step). As a result, nitrogen, phosphorus, etc., which are nutrients for seaweed, are contained in the kneaded product of raw rubber and shell powder, and at the same time, the strength of the kneaded product is improved, so it is easy to adhere under environments such as low temperature and water, while it is difficult to peel off after adhesion.

[0027] In this embodiment, in the above-described shell powder kneading step, in addition to the shell powder, bark compost as fulvic acid iron is added and kneaded. As a result, fulvic acid iron that promotes the growth of seaweed will also be contained in the kneaded product. The order of adding the shell powder and the bark compost (fulvic acid iron) can be either first or at the same time.

[0028] Finally, the kneaded mixture of the raw rubber and the shell powder is formed into a sheet shape or a string shape (Step S3: Seaweed fertilizer forming step). At this time, compared with the liquid latex, the raw rubber kneaded as a raw material makes the kneaded mixture stronger and less likely to collapse, which facilitates handling and also makes it easier to form. In addition, since it becomes easier to deform by being formed into a sheet shape or a string shape, the seaweed fertilizer 1 can be easily held on the aquaculture rope and effectively fertilize and top-dress nutrients to the seaweed.

[0029] [3] Seaweed aquaculture facilities and aquaculture methods Next, the seaweed aquaculture facility 10 and aquaculture method of the present embodiment will be described. First, as shown in FIG. 2, an aquaculture facility 10 equipped with an aquaculture rope 11 is installed in the sea (Step S11: Aquaculture facility installation step). As the aquaculture facility 10, mainly, as shown in FIG. 3, the main rope 111 stretched in a substantially horizontal direction in the sea is used as the aquaculture rope 11, and the main rope direct attachment method in which the seaweed seedlings are directly held thereon, and as shown in FIG. 5, the branch rope 112 hanging from the main rope 111 into the sea is used as the aquaculture rope 11, and there is a branch rope attachment method in which seaweed seedlings are held thereon.

[0030] In any type of aquaculture facility 10, both ends of the main rope 111 are fixed to the seabed by anchor bolts 12, and a plurality of floats 13 are connected to the central portion of the main rope 111. Thereby, the main rope 111 maintains a floating state at a predetermined depth position from the seabed.

[0031] Also, in the main rope direct attachment method, as shown in FIG. 4(a), there is a case where a short seedling thread 14 is sandwiched and held in the mesh of the main rope 111, and as shown in FIG. 4(b), a long seedling thread 14 is spirally wound around the main rope 111, and both ends thereof are sandwiched and held in the mesh of the main rope 111.

[0032] On the one hand, in the branch line attachment method, as shown in Fig. 6(a), there are cases where the short seedling thread 14 is sandwiched and held in the mesh of the branch line 112, and as shown in Fig. 6(b), the long seedling thread 14 is spirally wound around the branch line 112, and both ends are sandwiched and held in the mesh of the branch line 112.

[0033] Note that the aquaculture rope 11 is not limited to the main line 111 and the branch line 112, and it may be something like a weight attached to the lower end of a single rope and submerged. Also, the method of holding seaweed seedlings on the aquaculture rope 11 is not limited to the method of sandwiching or winding the seedling thread 14, as long as the seaweed seedlings are held in a state where they are not easily detached from the aquaculture rope 11.

[0034] Subsequently, the seaweed fertilizer 1 is fixed at a position near the seedlings on the aquaculture rope 11 installed in the sea (Step S12: Seaweed fertilizer fixing step). Specifically, when the seedling thread 14 is sandwiched in the mesh of the main line 111 or the branch line 112, which is the aquaculture rope 11, as shown in Figs. 4(a) and 6(a), the sheet-like seaweed fertilizer 1 is wound around the aquaculture rope 11 in a cylindrical shape and fixed at a position near the seedling thread 14.

[0035] Specifically, after the seaweed fertilizer 1 is wound around the aquaculture rope 11, its end is strongly pressed against the lower layer of the seaweed fertilizer 1 using a crimping pliers or hands. As a result, the seaweed fertilizers 1 are easily crimped together and fixed to the aquaculture rope 11, and thus the seaweed aquaculture facility 10 equipped with the seaweed fertilizer 1 is completed. Note that in this embodiment, as shown in Fig. 7, the seaweed fertilizer sheet 1 is wound around the aquaculture rope 11 for about two turns, but it is not limited to this, and the number of turns may be appropriately increased or decreased according to the required fertilization amount.

[0036] In addition, in the present embodiment, as shown in FIG. 7, when the sheet-shaped fertilizer material 1 for seaweed is used in the above-described fertilizer material fixing step for seaweed, an adhesive sheet 2 for facilitating the crimping of the fertilizer material 1 for seaweed is interposed at the end of the fertilizer material 1 for seaweed and crimped. In the present embodiment, the adhesive sheet 2 contains raw rubber and shell powder and is manufactured by the same manufacturing method as the fertilizer material 1 for seaweed, but has a lower content rate of shell powder than the fertilizer material 1 for seaweed.

[0037] For example, the content rate of the shell powder in the fertilizer material 1 for seaweed can be set to 80%, and the content rate of the shell powder in the adhesive sheet 2 can be set to 50%. Thereby, the adhesive sheet 2 with a lower content rate of shell powder has higher viscosity than the fertilizer material 1 for seaweed, so that an adhesive effect can be obtained, and the fertilizer material 1 for seaweed can be firmly adhered by setting an appropriate content rate. Note that the content rates of the shell powder in the fertilizer material 1 for seaweed and the adhesive sheet 2 are not limited to the above numerical values and can be set as appropriate.

[0038] On the other hand, when the seedling thread 14 is spirally wound around the main rope 111 or the branch rope 112 of the aquaculture rope 11, as shown in FIGS. 4(b) and 6(b), a string-shaped fertilizer material 1 for seaweed is spirally wound around the aquaculture rope 11 so as to overlap the seedling thread 14 and fixed. Alternatively, the string-shaped fertilizer material 1 for seaweed may be cut short into a plurality of pieces and sandwiched and fixed in the meshes of the aquaculture rope 11 at a predetermined interval.

[0039] As described above, in the present invention, the vicinity position of the seedling includes not only the range within a short distance from the seedling but also the state of contacting the seedling.

[0040] In addition, when the fertilizer 1 for seaweed becomes smaller due to natural decomposition or detaches from the aquaculture rope 11 due to rough waves, etc., the fertilizer 1 for seaweed is top-dressed on the aquaculture rope 11 (step S13: seaweed fertilizer top-dressing step). Specifically, after approaching the aquaculture rope 11 by boat, simply reel it in and wrap the fertilizer 1 for seaweed around it or sandwich it in the mesh of the aquaculture rope 11 to complete the top-dressing. Therefore, there is no need to land the aquaculture rope 11 for work, and it is possible to easily top-dress the desired location with the desired amount whenever top-dressing is desired.

[0041] [4] Function and effect Next, the function of the fertilizer 1 for seaweed according to the present invention, the seaweed aquaculture facility 10 equipped with this, the manufacturing method of the fertilizer 1 for seaweed, and the seaweed aquaculture method will be described.

[0042] As described above, since the fertilizer 1 for seaweed fixed at the position near the seedlings in the aquaculture rope 11 is made of unvulcanized raw rubber, it is gradually naturally decomposed in the sea, and the nutrients of the shell powder are eluted into the surroundings over a long period. Therefore, in the aquaculture facility 10 equipped with the fertilizer 1 for seaweed, the seaweed seedlings held on the aquaculture rope 11 stably absorb the nutrients eluted from the nearby fertilizer 1 for seaweed and grow soundly and large.

[0043] In addition, the raw rubber used for the fertilizer 1 for seaweed is cheaper in cost compared to conventionally used latex, etc. Furthermore, the fertilizer 1 for seaweed can be easily fixed simply by winding it around the aquaculture rope 11 and crimping it or sandwiching it in the mesh. Therefore, the fertilizer 1 for seaweed can perform fertilization and top-dressing on seaweed simply and inexpensively. Moreover, since the fertilizer 1 for seaweed does not need to penetrate into the aquaculture rope 11 as in the past, a high-strength and inexpensive nylon rope, etc. can be used, and it becomes possible to increase the strength and reuse of the aquaculture rope 11.

[0044] In addition, the shell powder contained in the fertilizer for seaweed 1 improves the strength of the fertilizer for seaweed 1, makes it easy to adhere even in environments such as low temperatures and underwater, and makes it difficult to peel off after adhesion. Furthermore, in this embodiment, since the adhesive sheet 2 having a lower shell powder content rate than the fertilizer for seaweed 1 has high viscosity, when the fertilizer for seaweed 1 is wound and fixed, the ends of the fertilizer for seaweed 1 are easily and firmly adhered by interposing this sheet.

[0045] Also, in this embodiment, since the shell powder of sea urchin shells is used as the shell powder, the waste sea urchin shells are effectively utilized, and an effect of protecting from sea urchins that are enemies of seaweed can also be expected. Furthermore, since the iron fulvate contained in the fertilizer for seaweed 1 is utilized when seaweed takes in nitrogen or performs photosynthesis, the growth of seaweed is further promoted.

[0046] According to the fertilizer for seaweed 1 according to the present invention as described above, the seaweed cultivation facility 10 equipped with this, the manufacturing method of the fertilizer for seaweed 1, and the seaweed cultivation method, the following effects are achieved. 1. With the fertilizer for seaweed 1, fertilization and topdressing can be easily and inexpensively performed on seaweed, and the strength of the cultivation rope 11 can be increased and reused. 2. By using the powder of sea urchin shells as the shell powder, the waste sea urchin shells can be effectively utilized, and protection from sea urchins that are enemies of seaweed can be achieved. 3. By containing iron fulvate in the fertilizer for seaweed 1, the growth of seaweed can be promoted. 4. It can be appropriately fixed to the cultivation rope according to the shape of the fertilizer for seaweed 1 such as sheet-like or string-like. 5. When the sheet-like fertilizer for seaweed 1 is wound and fixed, by interposing the adhesive sheet 2 at the end of the fertilizer for seaweed 1, it is possible to make the fertilizer for seaweed 1 easy to adhere. 6. Since the fertilizer for seaweed 1 can be manufactured only from naturally-derived raw materials, fertilization and topdressing can be performed on seaweed without having an adverse effect on the environment.

[0047] Note that the fertilizer for seaweed 1, the seaweed cultivation facility 10 equipped with the same, the method for manufacturing the fertilizer for seaweed 1, and the method for cultivating seaweed according to the present invention are not limited to the above-described embodiments and can be appropriately changed.

Explanation of Signs

[0048] 1 Fertilizer for seaweed 2 Adhesive sheet 10 Cultivation facility 11 Cultivation rope 111 Main rope 112 Branch rope 12 Anchor bolt 13 Float 14 Seedling thread

Claims

1. A fertilizer for seaweed for fertilizing seaweed, containing unvulcanized raw rubber and shell powder obtained by pulverizing the shells of marine organisms, and is formed in a sheet shape or a string shape, a fertilizer for seaweed.

2. The fertilizer for seaweed according to claim 1, further containing bark compost impregnated with an iron fulvate aqueous solution.

3. The fertilizer for seaweed according to claim 1, wherein the shell powder is powder of sea urchin shells.

4. having a cultivation rope holding seaweed seedlings, when the fertilizer for seaweed is formed in a sheet shape, on the cultivation rope, the fertilizer for seaweed according to any one of claims 1 to 3 is wound around and fixed in a cylindrical shape at a position near the seedlings, a seaweed cultivation facility.

5. At the end of the fertilizer for seaweed wound around the cultivation rope, an adhesive sheet containing the raw rubber and the shell powder and having a lower content of the shell powder than the fertilizer for seaweed is interposed and fixed, the seaweed cultivation facility according to claim 4.

6. A method for manufacturing a fertilizer for seaweed for fertilizing seaweed, a raw rubber kneading step of kneading unvulcanized raw rubber with an open roll machine, a shell powder kneading step of adding and kneading shell powder obtained by pulverizing the shells of marine organisms to the kneaded raw rubber, a fertilizer for seaweed forming step of forming the kneaded raw rubber and the shell powder into a sheet shape or a string shape, having, a method for manufacturing a fertilizer for seaweed.

7. In the shell powder kneading step, the method for manufacturing a fertilizer for seaweed according to claim 6, further adding and kneading bark compost impregnated with an iron fulvate aqueous solution.

8. A method for cultivating seaweed using a cultivation rope holding seaweed seedlings, when the fertilizer for seaweed is formed in a sheet shape, at a position near the seedlings on the cultivation rope, a fertilizer for seaweed according to any one of claims 1 to 3 is wound around in a cylindrical shape, and then an end portion thereof is crimped and fixed, a method for cultivating seaweed having a fertilizer for seaweed fixing step.

9. In the fertilizer for seaweed fixing step, an adhesive sheet containing the raw rubber and the shell powder and having a lower content of the shell powder than the fertilizer for seaweed is interposed at the end of the fertilizer for seaweed and crimped, the method for cultivating seaweed according to claim 8.

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