Method for producing coated granular fertilizer in which dissolution rate and fertilizer effect timing are adjusted according to the content of seaweed mixed with natural oil

Abstract

The present invention relates to a method for producing a coated granular fertilizer in which the dissolution rate and the fertilizer effect time are adjusted according to the content of seaweed mixed with natural oil. More specifically, a first step of mixing natural oil and a seaweed dispersion colloid to produce a mixture, a second step of heating and melting the mixture mixed in the first step and then performing a primary coating on the surface of the granular fertilizer using this as a coating material, a third step of performing a secondary coating using clay powder or silicon dioxide on the surface of the primary coated granular fertilizer produced in the second step to induce hardening, and a fourth step of mixing the fertilizer eluted at a specific time point produced in the first to third steps according to the required amount of the plant to complete a mixed dissolution adjustment fertilizer. The present invention relates to a method for producing a coated granular fertilizer in which the dissolution rate and the fertilizer effect time are adjusted according to the content of seaweed mixed with natural oil.

Description

Technical Field

[0001] The present invention relates to the development of an eco-coating material with a controlled dissolution rate and a method for producing a coated granular fertilizer with a controlled fertilizer effect time using the same.

Background Art

[0002] Generally, fertilizers are substances for supplying nutrients to edible plants and foliage plants or promoting growth, and are culture solutions dissolved by water or moisture to supply nutrients to plants.

[0003] Such fertilizers can be classified into slow-release fertilizers, quick-acting fertilizers, chemical fertilizers, organic fertilizers, and the like.

[0004] Here, slow-release fertilizers are terms compared with quick-acting fertilizers in which the effect of fertilizers applied to the soil appears quickly like ammonium sulfate, and refer to fertilizers whose effects appear slowly. Quick-acting fertilizers not only cause temporary concentration disorders and excessive nutrition, but are also likely to be lost or invalidated, and have the disadvantage of requiring a lot of labor because they must be applied multiple times.

[0005] What compensates for the drawbacks of the above fertilizers is slow-release fertilizers, and various slow-release fertilizers have been developed as qualitative fertilizers.

[0006] In addition, slow-release fertilizers are those in which the ratio of water-soluble components is lowered in the manufacturing process so that the water-soluble components are decomposed slowly, or those coated with a special substance to slow down the dissolution rate.

[0007] Such conventional slow-release fertilizers are classified into the following types.

[0008] First, IBDU (Isobutylidene diurea) is a fertilizer made by mixing urea with aldehyde, which is poorly soluble in water and is designed to gradually release nitrogen components. It is also abbreviated as IB. It is a granular fertilizer with particle size of 1.7 - 4.0 mm. Half of the nitrogen is in the form of IB nitrogen, and the other half is in the form of quick-acting ammonia nitrogen. It is designed to be effective in the early growth stage and last until the later stage. Compared with CDU which dissolves under the action of microorganisms, IBDU has the characteristic of gradually dissolving only in water.

[0009] Also, CDU (Crotonylidene diurea) is a slow-release nitrogen fertilizer and a compound fertilizer containing phosphoric acid and potassium. It is made by reacting urea with acetaldehyde and is hardly soluble in water. Its chemical structure is like a turtle shell. The nitrogen attached to the side dissolves in water and is easily released, while the components in the shell are released only after a long time by the decomposition of microorganisms, so it has the characteristic of maintaining its effect for a very long time.

[0010] Furthermore, UF (Urea formaldehydes) is a slow-release nitrogen fertilizer made by reacting urea with formaldehyde to form methylene urea. It has no odor and is a white solid with a nitrogen content of 38 - 42%. Depending on the amount of formaldehyde mixed, there are multiple types such as urea that is highly soluble in water and urea that is poorly soluble in water, and the effect lasts for a very long time. It has no harmful components, does not cause concentration damage to crops, and does not deteriorate the soil.

[0011] In addition, it is a coated compound fertilizer granule with a quick-acting fertilizer skin with a film that contains about half or no water, so that the fertilizer components gradually dissolve and come out through the small holes in the film. Because of the film, it is also called "coated fertilizer". It contains both phosphoric acid and potassium, and these also gradually dissolve and come out. The nitrogen in this fertilizer has almost no denitrification and solute, and the effect appears slowly and lasts continuously.

[0012] On the one hand, chemical fertilizers and slow-release fertilizers are composed of chemical substances such as chemical fertilizers. When provided as nutrients to edible plants, they cause various side effects such as acidifying the soil, reducing soil fertility, and environmental pollution.

[0013] In addition, in order to solve such problems, compost, which is an organic fertilizer, that is, a mixture of livestock manure, chicken manure, fish, and plant fibers such as sawdust, can be mixed into the soil to prevent environmental pollution.

[0014] However, for each plant, or livestock manure and chicken manure, fish by-products, and sawdust, the nutritional components of the feed and the production environment of the compost change depending on the season, the state of the livestock, and the environment. If they are different from the nutrients required for each edible plant due to other nutritional components, not only can high-quality edible plants not be produced, but there is also a problem of producing edible plants of different qualities for each cultivation period.

[0015] In addition, when the compost contains pathogenic bacteria, there is a problem of providing a fatal harmful environment for edible plants.

[0016] Therefore, there is a need for the development of a coating technology for organic fertilizers provided in granular form that can supply nutrients to plants and apply eco-friendly materials without harmful substances.

[0017] In addition, plants have different nutrient requirements at different stages of crop growth. In conventional agriculture, this is addressed by applying fertilizers adapted to the crop growth stage two or more times. However, due to reasons such as labor force and cost reduction, a method of applying fertilizers once, where the fertilizer effect timing is adjusted, has become popular.

[0018] However, since it is extremely difficult to adjust the timing when the fertilizer effect appears, existing chemical coating methods use methods such as laminating to adjust the fertilizer effect timing. In coating methods using natural products, due to problems such as the uniformity of natural products and the lower slow-release effect compared to chemical coating methods, a new method for adjusting the fertilizer effect perspective is needed due to problems such as lamination limits. Summary of the Invention

Problems to be Solved by the Invention

[0019] The present invention has been made to solve the above problems, and an object of the present invention is a coated granular fertilizer coated with an eco-friendly material using only natural product raw materials instead of synthetic resin, which expands the applicability of automated equipment through eco-certification and prevention of solidification phenomenon, and reduces the application rate and the number of operations by adjusting the timing of fertilizer effect. The present invention provides a method for producing a coated granular fertilizer in which the dissolution rate and the timing of fertilizer effect are adjusted by the content of seaweed mixed in natural oil.

[0020] Another object of the present invention is to minimize nutrient loss of granular fertilizer, prevent green algae and red tide phenomena, and minimize problems of environmental pollution of soil and rivers caused by residues of chemical coating materials. The present invention provides a method for producing a coated granular fertilizer in which the dissolution rate and the timing of fertilizer effect are adjusted by the content of seaweed mixed in natural oil.

Means for Solving the Problems

[0021] According to one aspect of the present invention, the present invention includes a first step of mixing natural oil and seaweed dispersion colloid to produce a mixture, a second step of heating and melting the mixture mixed in the first step, and then performing a primary coating on the surface of granular fertilizer using this as a coating material, a third step of performing a secondary coating using clay powder or silicon dioxide on the surface of the primary coated granular fertilizer produced in the second step to induce curing, and a fourth step of mixing fertilizers eluted at a specific time point produced in the first to third steps according to the required amount of plants to complete a mixed dissolution adjusted fertilizer. The present invention provides a method for producing a coated granular fertilizer in which the dissolution rate and the timing of fertilizer effect are adjusted by the content of seaweed mixed in natural oil.

[0022] The natural oil includes one or a combination of two or more selected from the group consisting of palm oil, coconut oil, soy milk, corn oil, peanut oil, palm kernel oil, sunflower oil, rapeseed oil, grape seed oil, linseed oil, cottonseed oil, olive oil, safflower oil, and lard oil. The seaweed includes one or a combination of two or more of seaweed, wakame, kelp, nori, mozuku, agar, carrageenan, and indigo naturalis.

[0023] In the first step, the natural wax and the seaweed are mixed at a weight ratio of 1:0.1 to 1:10.

[0024] In the first step, the mixture is sufficiently stirred at 80 to 100 °C, heated for 30 minutes to be melted, and then left to cool at a temperature of 15 to 25 °C until the temperature reaches 50 to 60 °C.

[0025] In the second step, the mixture produced in the first step is pre-coated on the surface of the granular fertilizer at a weight ratio of 1:0.001 to 0.02, and then the mixture produced in the first step is laminated on the surface of the granular fertilizer after the pre-coating is completed at a weight ratio of 1:0.001 to 0.02 to perform post-coating.

[0026] The clay powder includes one or a combination of two or more of zeolite, bentonite, attapulgite, and perlite.

[0027] In the third step, the granular fertilizer is manufactured by performing a secondary coating of the clay powder on the surface of the primary coated granular fertilizer at a weight ratio of 1:0.001 to 0.02 so as to induce curing on the surface of the granular fertilizer to form a surface flattening and prevent hardening between the granular fertilizers.

[0028] In the fourth step, in order to adjust the fertilizer effect timing according to the required amount for each plant, the content of seaweed mixed with the natural oil in the first step is adjusted, or quick-acting fertilizers and slow-acting fertilizers manufactured with different numbers of primary coating and secondary coating performed in the second and third steps are mixed at a weight ratio suitable for the required amount for each plant.

[0029] Also, according to another aspect of the present invention, the present invention provides a coated granular fertilizer in which the elution rate and the fertilizer effect timing are adjusted according to the content of seaweed mixed with the natural oil, manufactured by the manufacturing method of the present invention.

Advantages of the Invention

[0030] The present invention is a granular fertilizer coated with an eco-friendly material using only natural raw materials instead of synthetic resins harmful to the environment. By eco-certification, the possibility of using automated equipment by preventing solidification phenomena, and enhancing slow-acting properties, the application amount and the number of operations can be reduced.

[0031] In addition, in the present invention, since a multi-coating layer using an eco-coating material is formed on the surface of the granular fertilizer, nutrient loss of the granular fertilizer is minimized, green algae and red tide phenomena are prevented, and problems of environmental pollution of soil and rivers caused by residues of chemical coating materials can be minimized.

[0032] Furthermore, in the present invention, by applying a natural clay powder coating to the surface of the granular fertilizer coated with an eco-friendly material, the coating effect is maximized by promoting rapid hardening when a coating layer of natural substances is formed, and the solidification phenomenon can be remarkably prevented.

[0033] The present invention can reduce agricultural labor and fertilizer application amount by adjusting the fertilizer effect timing of the eco-fertilizer so that the fertilizer effect is exerted according to the nutrient requirement amount at each stage of plant crop growth with a single fertilizer application.

Brief Description of the Drawings

[0034]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0035] Hereinafter, when it is determined that the specific description of the related known technology obscures the gist of the present invention unnecessarily, the detailed description thereof will be omitted. Also, the numbers used in the description process of this specification are merely identification symbols for distinguishing one component from another component.

[0036] In addition, the terms used in this specification and the claims should not be construed as being limited to their dictionary meanings. The inventor should analyze them in a meaning and concept consistent with the technical idea of the present invention in accordance with the principle that the concept of the terms can be appropriately defined in order to explain his invention in the best way.

[0037] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and that there can already be various equivalents and modifications that can replace them at the time of this application.

[0038] The preferred embodiments of the present invention will be described more specifically, and for well-known technical parts, they will be omitted or compressed for the sake of brevity of the description.

[0039] Aspects of the present invention include a first step of mixing natural fats and oils and seaweed dispersion colloids to produce a mixture; a second step of heating and melting the mixture mixed in the first step and then performing a primary coating on the surface of granular fertilizer using this as a coating material; a third step of inducing curing by performing a secondary coating using clay powder or silicon dioxide on the surface of the primary coated granular fertilizer produced in the second step; and a fourth step of mixing fertilizers eluted at a specific time point produced in the first to third steps according to the requirements of plants to complete a mixed elution regulated fertilizer. A method for producing a coated granular fertilizer is provided, in which the elution rate and the fertilizer effect time point are regulated by the content of seaweed mixed in natural fats and oils.

[0040] More specifically, FIG. 1 is a flowchart showing a method for producing a coated granular fertilizer in which the elution rate and the fertilizer effect time point are regulated by the content of seaweed mixed in natural fats and oils according to an embodiment of the present invention.

[0041] Hereinafter, with reference to FIG. 1, a method for producing a coated granular fertilizer in which the elution rate and the fertilizer effect time point are regulated by the content of seaweed mixed in natural fats and oils according to an embodiment of the present invention will be described in detail.

[0042] 1. Mixture generation step (first step) In this step, natural fats and oils and seaweed dispersion colloids are mixed to produce a mixture.

[0043] Here, the natural fats and oils are one or a combination of two or more selected from the group consisting of palm oil, coconut oil, soy milk, corn oil, peanut oil, palm kernel oil, sunflower oil, rapeseed oil, grape seed oil, linseed oil, cotton oil, olive oil, safflower oil, lard oil, and the like.

[0044] In addition, seaweed generally refers to all photosynthetic organisms inhabiting the sea and is a term commonly used to refer to algae emerging from the sea. Unlike terrestrial plants, it does not have organs clearly differentiated into roots, trunks, and leaves, and is a thallus composed entirely of leaves. It is broadly divided into three types: green algae, brown algae, and red algae. In the present invention, any seaweed that can be used in the art can be used. Specifically, one or a combination of two or more of green seaweed, green horn, indigo, wakame, kelp, nori, sea lettuce, agar, and carrageenan is used. Such seaweed mainly uses those without commercial value, and reusable seaweed can also be used.

[0045] Such seaweed is crushed and used in a dispersed colloidal form. The crushing can be performed manually or automatically using any crushing device available in the art. As an example, a ball mill or a blade mill is used. The crushing time is not particularly limited in the present invention and can be appropriately adjusted according to the operator's environment.

[0046] In this stage, the seaweed dispersed colloid is added and mixed with natural oil at a certain ratio to adjust the elution rate. Specifically, the natural oil and the seaweed dispersed colloid are mixed at a weight ratio of 1:0.1 to 1:10. If outside such a range, problems will occur in adjusting the desired elution rate.

[0047] 2. Primary coating (the second stage) In this stage, after heating and melting the mixture mixed in the first stage, it is used as a coating material to perform a primary coating on the surface of the granular fertilizer.

[0048] First, in this stage, the mixture is sufficiently stirred at 80 to 100 °C, heated and melted for 30 minutes, and then left to cool at a temperature of 15 to 25 °C until the temperature reaches 50 to 60 °C.

[0049] The purpose of this stage is to ensure that the coating agent is sufficiently coated on the surface of the granular fertilizer through one or more repeated coatings.

[0050] That is, in this stage, the surface of the granular fertilizer is pre-coated with the mixture produced in the first stage at a weight ratio of 1:0.001 to 0.02. If necessary, the mixture produced in the first stage is again laminated on the surface of the pre-coated granular fertilizer at a weight ratio of 1:0.001 to 0.02 to perform post-coating.

[0051] Also, in this stage, it is desirable that the total content of the coating mixture used for pre-coating and post-coating is provided at a content of 1% or less with respect to 100% of the granular fertilizer. This is because when the total content of the coating material exceeds 1%, a hardening phenomenon occurs between the granular fertilizer particles.

[0052] 3. Secondary coating (the third stage) In this stage, a secondary coating using clay powder or silicon dioxide is performed on the surface of the primary coated granular fertilizer produced in the second stage to induce hardening.

[0053] By performing such a secondary coating, rapid hardening and surface flattening can be induced, and cracking can be prevented.

[0054] Also, in this stage, in order to prevent the hardening phenomenon between the granular fertilizers by inducing rapid hardening and surface flattening and preventing cracking on the surface of the granular fertilizer, a secondary coating of clay powder or silicon dioxide is performed on the surface of the primary coated granular fertilizer at a weight ratio of 1:0.001 to 0.02.

[0055] The clay powder is mainly one or a combination of two or more of zeolite, bentonite, attapulgite, and perlite available in the field.

[0056] Also, in the present invention, as a natural substance, in addition to the clay powder, silicon dioxide can be used.

[0057] 4. Completion stage of the mixed elution control fertilizer (stage 4) In this stage, fertilizers eluted at specific time points generated in the first to third stages are mixed according to the requirements of the plants to complete the mixed elution control fertilizer.

[0058] That is, in this stage, in order to adjust the fertilizer efficiency time point of the fertilizer according to the requirements of different plants, in the first stage, the content of the seaweed dispersion colloid mixed with the natural oil is adjusted, or the quick-acting fertilizer and slow-acting fertilizer produced with different numbers of primary coating and secondary coating performed in the second and third stages are mixed at a weight ratio suitable for the requirements of different plants.

[0059] Specifically, in this stage, the component content of the mixture generated in the first stage is made different, or in the third stage, various types of coated fertilizers (or uncoated fertilizers) coated so that specific nutrients are contained in the fertilizer at a specific time point according to the nutrient requirement time point of the plant are mixed.

[0060] Also, in this stage, according to the type of fertilizer required by the plant, coated fertilizers with the number of primary coating and secondary coating in the second and third stages adjusted can be mixed to adjust the fertilizer efficiency time point. For example, when producing a fertilizer that requires a quick-acting coating, fertilizers that do not perform the primary coating in the second stage or only perform pre-coating among the secondary coatings in the third stage can be mixed. Additionally, when a higher quick-acting effect is required, uncoated fertilizers can also be mixed.

[0061] Also, in this stage, for fertilizers of nutrients that require quick-acting effects, the addition amount of the seaweed dispersion colloid is reduced in the first stage, and for fertilizers of nutrients that require slow-acting effects, the content of the seaweed dispersion colloid is increased in the first stage. After the process of the third stage is completed, fertilizers that require slow-acting effects or quick-acting effects are mixed according to the requirements of different plants, thereby completing the production of fertilizers whose fertilizer efficiency time points are adjusted by different nutrients.

[0062] Also, at this stage, the fertilizers whose fertilizer effects are adjusted at specific times are one or a combination of two or more kinds.

[0063] In this way, depending on the content of the seaweed-dispersed colloid mixed with the natural oil produced by the above-described first to third stages, or the first to fourth stages, the coating granular fertilizer whose elution rate and fertilizer effect time are adjusted is coated with a natural coating material, and the seaweed-dispersed colloid is added to the natural oil (oil), so that hardening proceeds quickly and the coating film becomes hard, thereby obtaining slow-release properties. This is environmentally friendly and can significantly enhance the coating effect. Of course, it can prevent the cracking and solidification phenomena of the granular fertilizer. Also, by adjusting or specifying the fertilizer effect time, it is possible to adjust so that specific nutrients are supplied to the plant at the time required by the plant with a single application.

[0064] On the other hand, when the hardening speed becomes slow during actual factory production, the colloidal coating can be induced to harden within a short time through clay powder or silicon dioxide coating, and cracking prevention and surface flattening can be induced. Therefore, during actual factory production, by implementing this, after the primary coating, clay powder or silicon dioxide can be mixed to complete the secondary coating, and then production can be completed. After the production of the coating fertilizer is completed, a stabilization stage will occur during the storage or transportation stage. In this case, if the third stage is not passed, solidification, cracking, and powdering between products will occur.

[0065] Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples are merely illustrative of the present invention and are not limited thereto.

[0066] <Example> Production of the granular fertilizer of the present invention Natural oil (palm oil) and kelp-dispersed colloid were mixed at a weight ratio of 1:5.

[0067] While heating the mixture, it was heated for 30 minutes to melt it, then cooled to a temperature of 50°C, and this was used as a coating material to coat granular fertilizer at a weight ratio of 1:0.001 - 0.02 (granular fertilizer: mixture).

[0068] The primary coated granular fertilizer was coated with clay powder at a weight ratio of 1:0.001 - 0.02 (granular fertilizer: clay powder) to produce granular fertilizer.

[0069] <Experimental Example> Coating Test and Elution Test Figure 2 is a graph showing the change in the concentration of electrolyte in water over time for the slow - release granular fertilizers according to the examples and comparative examples of the present invention.

[0070] To examine the coating effect of the elution - controlled granular fertilizer produced by the method for producing a coating granular fertilizer in which the elution rate and the fertilizer - effective time are adjusted according to the content of the seaweed - dispersed colloid mixed with natural oil according to the examples of the present invention, the elution test in water was measured by an EC test.

[0071] With the passage of the time when left standing in water, the change in the concentration of electrolyte in water is shown in Table 1 below, and the results represented by the graph are shown in Figure 2.

Table 1

[0072] Comparative Example: Control group (highly soluble fertilizer) Example 1: Fertilizer with weakened coating Example 2: Fertilizer mixed at a ratio of Comparative Example: Example 1: Example 3 = 3:3:4 Example 3: Fertilizer with strengthened coating

[0073] Referring to Table 1 and Figure 2 above, it can be seen that in the comparative examples where no coating was applied, all of them dissolved within less than 10 minutes after being put into water, and in Examples 1 to 3, it can be seen that they dissolved slowly over time. From the change in the components of the vegetable oil, which is the coating material generated in the first stage, it can be seen that the dissolution rate of Example 1, where the coating force was set slightly weaker, was higher than that of Example 3, where the coating force was set stronger.

[0074] That is, Example 1 is a fertilizer that has progressed to pre - coating in the third stage, Example 3 is a fertilizer that has progressed through post - coating in the third stage, and Example 2 is a fertilizer obtained by mixing a comparative example where no coating was applied in the fourth stage, Example 1 with a weakened coating, and Example 3 with a strengthened coating in a ratio of 3:3:4.

[0075] For Example 2, it can be confirmed that the dissolution rate is between that of the comparative example and Examples 1 and 3. From the change in the components of the mixture generated in the first stage, it shows that fertilizers with various coating forces can be produced, and through these various combinations, it is possible to produce an elution - regulated organic fertilizer that can be adjusted to dissolve at a desired time.

[0076] In this way, by adding the natural material of seaweed - dispersed colloid to natural oil (fat), a synergistic effect with the components of the natural oil is achieved. When coating with a substance that has such an effect, the coating effect can be maximized, suggesting that a sustained - release and elution - regulating function can be obtained simultaneously. This implies that it has become possible to produce an elution - regulated organic fertilizer coated with 100% natural materials in the future domestic fertilizer market, which has very important significance in ecological farming methods.

[0077] As described above, the specific description of the present invention has been made by way of examples. However, since the above examples are only illustrative of preferred examples of the present invention, the present invention should not be understood as being limited to the above examples, and the scope of the rights of the present invention should be understood in terms of the claims described below and their equivalent concepts. Industrial Applicability

[0078] The method for producing a coated granular fertilizer in which the elution rate and the fertilizer effect timing are adjusted according to the content of seaweed mixed with natural oils and fats of the present invention is a granular fertilizer coated with an eco-friendly material using only natural raw materials instead of synthetic resins harmful to the environment. By means of eco-certification, the availability of automated equipment for preventing solidification phenomena, and the enhancement of slow-release properties, the application amount and the number of operations can be reduced. Since a multi-coating layer using an eco-coating material is formed on the surface of the granular fertilizer, nutrient loss of the granular fertilizer can be minimized, the occurrence of green algae and red tide phenomena can be prevented, and the problems of soil and river environmental pollution caused by the residue of chemical coating materials can be minimized. By performing a natural-derived clay powder coating on the surface of the granular fertilizer coated with an eco-friendly material, rapid hardening is promoted when a coating layer of natural substances is formed, so that not only can the coating effect be maximized, but also the solidification phenomenon can be remarkably prevented. By adjusting the fertilizer effect timing of the eco-fertilizer, the fertilizer effect can be exerted in accordance with the nutrient requirement amount at each stage of plant crop growth with a single fertilizer application, so that the agricultural labor force and the fertilizer application amount can be reduced, and thus it has industrial applicability.

Claims

1. A first step of mixing natural fats and oils and seaweed dispersion colloids to form a mixture; A second step of heating and melting the mixture mixed in the first step, and then using the melted mixture as a coating material to perform a primary coating on the surface of the granular fertilizer; and a third step of applying a secondary coating using clay powder or silicon dioxide to the surface of the primary coated granular fertilizer produced in the second step to induce hardening. The method for producing a coated granular fertilizer in which the dissolution rate and the time point of fertilizer effect are controlled according to the content of seaweed mixed with natural oils and fats.

2. 2. The method for producing a coated granular fertilizer in which the dissolution rate and the time of fertilizer effect are controlled according to the content of seaweed mixed with natural oils and fats as described in claim 1, further comprising a fourth step of mixing the fertilizers that are dissolved at specific times produced by the first to third steps according to the amount required by the plant to produce a mixed and controlled dissolution fertilizer.

3. The natural fats and oils include one or a combination of two or more selected from the group consisting of palm oil, coconut oil, soybean milk, corn oil, peanut oil, palm kernel oil, sunflower oil, rapeseed oil, grape seed oil, flax oil, cotton oil, olive oil, safflower oil, and lard oil; 2. The method for producing a coated granular fertilizer, the dissolution rate and the time of fertilizer effect being controlled according to the content of the seaweed mixed with the natural oils and fats according to claim 1, characterized in that the seaweed includes one or a combination of two or more of green seaweed, blue horn, blue seaweed, wakame, kelp, rock laver, laver, sargassum, agar, and carrageenan.

4. The method for producing a coated granular fertilizer in which the dissolution rate and the time point of fertilizer effect are controlled according to the content of seaweed mixed with the natural oils and fats according to claim 1 or 3, wherein in the first step, the natural wax and seaweed are mixed in a weight ratio of 1:0.1 to 1:

10.

5. The method for producing a coated granular fertilizer, the dissolution rate and fertilizer effect time of which are controlled according to the content of seaweed mixed with natural oils and fats, according to claim 1, characterized in that in the first step, the mixture is thoroughly stirred at 80 to 100°C, heated for 30 minutes to melt, and then left to stand at a temperature of 15 to 25°C until the temperature reaches 50 to 60°C, and then cooled.

6. In the second step, the mixture produced in the first step is pre-coated on the surface of the granular fertilizer in a weight ratio of 1:0.001 to 0.02, and then the mixture produced in the first step is layered again on the surface of the granular fertilizer after the pre-coating in a weight ratio of 1:0.001 to 0.02 to perform post-coating.

7. The method for producing a coated granular fertilizer, the dissolution rate and fertilizer effect time of which can be controlled according to the content of seaweed mixed with the natural oils and fats according to claim 1, characterized in that the clay powder comprises one or a combination of two or more of zeolite, bentonite, attapulgite, and perlite.

8. The third step is characterized in that the surface of the first coated granular fertilizer is coated with the clay powder in a weight ratio of 1:0.001 to 0.02 to induce hardening of the surface of the granular fertilizer, form a flat surface, and prevent compaction between the granular fertilizer, thereby producing a granular fertilizer. This is a method for producing a coated granular fertilizer whose dissolution rate and fertilizer effect time point are controlled depending on the content of seaweed mixed with natural oils and fats as described in claim 1 or claim 7.

9. The method for producing a coated granular fertilizer, the dissolution rate and the time when the fertilizer is effective being controlled depending on the content of seaweed mixed with the natural oil as described in claim 2, characterized in that in the fourth step, in order to control the time when the fertilizer is effective depending on the requirement of each plant, the content of seaweed mixed with the natural oil in the first step is adjusted, or fast-acting fertilizer and slow-acting fertilizer prepared by varying the number of times of first coating and second coating performed in the second and third steps are mixed in a weight ratio suitable for the requirement of each plant.

10. A coated granular fertilizer in which the dissolution rate and the time when the fertilizer is effective are controlled according to the content of seaweed mixed with natural fats and oils, characterized in that the coated granular fertilizer is manufactured by the manufacturing method of the coated granular fertilizer in which the dissolution rate and the time when the fertilizer is effective are controlled according to the content of seaweed mixed with natural fats and oils of claim 1.

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