A method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils.

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 adjusted dissolution rate and a method for manufacturing a coated granular fertilizer with adjusted fertilizer - effect timing 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, and organic fertilizers, etc.

[0004] Here, slow - release fertilizers are terms contrasted 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 nutrient excesses, but are also easily lost or invalidated, and have the disadvantage of requiring multiple applications, thus involving a lot of labor.

[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 reduced in the manufacturing process so that the water - soluble components are decomposed slowly, or those coated with special substances 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 and aldehyde, which does not dissolve well in water and releases nitrogen gradually. It is also abbreviated as IB. It is a granular fertilizer with particles of 1.7 to 4.0 mm, and half of the nitrogen is IB nitrogen, while the other half is fast-acting ammonia nitrogen. It is designed to be effective in the early stages of growth and to last into the later stages. Unlike CDU, which dissolves through the action of microorganisms, IBDU has the characteristic of dissolving gradually only in water.

[0009] Furthermore, CDU (Crotonylidene diurea) is a slow-release nitrogen fertilizer, and it is a compound fertilizer that also contains phosphorus and potassium. It is made by reacting urea and acetaldehyde and is almost insoluble in water. Its chemical structure resembles a turtle's shell; the nitrogen attached to the sides dissolves easily in water and is released, but the components inside the shell are released only after a considerable amount of time has passed and they are decomposed by 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 produced by reacting urea with poraldehyde to create methylene urea. It is odorless, a white solid, and has a nitrogen content of 38-42%. Depending on the amount mixed with poraldehyde, multiple types of urea are produced, including those that dissolve well in water and those that do not, resulting in a very long-lasting effect. It has the characteristics of containing no harmful components, not causing concentration damage to crops, and not degrading the soil.

[0011] In addition, coated compound fertilizers are granular, fast-acting fertilizers with a film that allows about half the water to penetrate, or not at all, to be applied to the outer layer. This allows the fertilizer components to gradually dissolve and be released through the small pores in the film. Because they are coated with a film, they are also called "coated fertilizers." They contain both phosphorus and potassium, which also dissolve and are released gradually. The nitrogen in this fertilizer undergoes very little denitrification and solute formation, resulting in a slow-acting and sustained effect.

[0012] On the other hand, chemical fertilizers and slow-release fertilizers, being composed of chemical substances like chemical fertilizers, can cause various side effects when used as nutrients for edible plants, such as soil acidification, reduced soil fertility, and environmental pollution.

[0013] Furthermore, to address these issues, mixing organic fertilizers such as compost—that is, livestock manure, chicken manure, fish, and plant fibers like sawdust—into the soil can help prevent environmental pollution.

[0014] However, the nutritional components of feed and the compost production environment vary depending on the plant, or on the time of year, the condition of the livestock, and the environment, so if the nutrients required differ from those required for each edible plant due to other nutritional components, it not only becomes impossible to produce high-quality edible plants, but there is also the problem of producing edible plants of varying quality depending on the growing season.

[0015] Furthermore, if the compost contains pathogens, it can create a fatally harmful environment for edible plants.

[0016] Therefore, there is a need for the development of coating technology for organic fertilizers that can be formed into granules to supply nutrients to plants and use eco-friendly materials free of harmful substances.

[0017] Furthermore, plants have different nutrient requirements at different stages of crop growth. Conventional agriculture addresses this by applying fertilizers at two or more stages of crop growth, but a method of applying fertilizer with an adjustable timing of effect only once has become popular due to reasons such as labor and cost reduction.

[0018] However, controlling the timing of when fertilizer effects appear is extremely difficult. Existing chemical coating methods use techniques such as layering to adjust the timing of fertilizer release. However, coating methods using natural materials have problems such as the uniformity of natural materials and a lower rate of release compared to chemical coating methods, and the limitations of layering. Therefore, new methods for adjusting fertilizer release are needed. [Overview of the project] [Problems that the invention aims to solve]

[0019] The present invention was made to solve the aforementioned problems, and the object of the present invention is to provide a method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils, thereby enabling eco-certification and prevention of solidification phenomena, thereby expanding the possibility of using automated equipment, and reducing the amount of application and the number of work by adjusting the timing of fertilizer effect.

[0020] Another object of the present invention is to provide a method for producing coated granular fertilizer in which the elution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils, which can minimize nutrient loss from granular fertilizer, prevent green algae and red tide phenomena, and minimize the problem of soil and river environmental pollution caused by residual chemical coating material. [Means for solving the problem]

[0021] According to one aspect of the present invention, the present invention provides a method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the amount of seaweed mixed with natural oil. This method is characterized by comprising: a first step of mixing natural oil and seaweed-dispersed colloid to produce a mixture; a second step of heating and melting the mixture produced in the first step, and then using this as a coating material to perform a primary coating on the surface of granular fertilizer; 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 fertilizers that dissolve at specific points in time, produced in the first to third steps, according to the plant's requirements to complete a mixed dissolution-adjusted fertilizer.

[0022] The natural oils include 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 seaweeds include one or a combination of two or more of sea tangle, sea mustard, indigo, wakame, kelp, nori, laver, hijiki, agar, and carrageenan.

[0023] In the first step, the natural fats and oils and seaweeds Dispersed colloid are mixed at a weight ratio of 1:0.1 to 1:10.

[0024] In the first step, the mixture is sufficiently stirred at 八十 to 100 °C and 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 again, 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 produced 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 the hardening phenomenon between the granular fertilizers.

[0028] [[ID=:27]] It should be noted that in the original text, "八十" in line 12 should probably be "80". This translation has been adjusted accordingly.In the fourth step, in order to adjust the fertilizer efficiency time point 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 whose dissolution rate and fertilizer efficiency time point are adjusted by the content of seaweed mixed with natural oil, which is manufactured by the manufacturing method of the present invention.

Effects 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 by enhancing slow-release properties, the spraying amount and the number of operations can be reduced.

[0031] Also, 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-derived clay powder coating to the surface of the granular fertilizer coated with an eco-friendly material, the coating effect is maximized by promoting rapid curing when a coating layer of natural substances is formed, and the solidification phenomenon can be prevented epochally.

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

Brief Description of the Drawings

[0034] [Figure 1]Figure 1 is a photograph showing the fertilizer surface after 1 minute in the electrical conductivity test of the present invention (control group: 1% chemical resin + 3% ATP; treatment group 1: 1% chemical resin + 2% sodium bentonite powder; treatment group 4: 1% chemical resin + 3% sodium bentonite powder). [Figure 2] Figure 2 is an illustrative image showing the rupture phenomenon caused by the difference in swelling degrees between sodium bentonite in water and chemical resin. [Modes for carrying out the invention]

[0035] In the following, if a detailed explanation of related prior art is deemed to unnecessarily obscure the gist of the present invention, such detailed explanation will be omitted. Furthermore, the numbers used in the description of this specification are merely identification symbols to distinguish one component from another.

[0036] Furthermore, the terms used in this specification and claims should not be limited to their dictionary definitions. Rather, in accordance with the principle that inventors can appropriately define the concepts of terms in order to best describe their invention, they should be interpreted in a way that is consistent with the technical idea of ​​the present invention.

[0037] Therefore, it should be understood that the embodiments and configurations shown in the drawings described herein are merely preferred embodiments of the present invention and do not represent the entire technical concept of the present invention, and that various equivalents and modifications that can be substituted for them exist at the time of filing.

[0038] Preferred embodiments of the present invention will be described in more detail, and well-known technical parts will be omitted or shortened for the sake of brevity.

[0039] The present invention provides a method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oil. This method comprises: a first step of mixing natural oil and seaweed-dispersed colloid to produce a mixture; a second step of heating and melting the mixture produced in the first step, and then using this as a coating material to perform a primary coating on the surface of granular fertilizer; 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 fertilizers that dissolve at specific points in time, produced in the first to third steps, according to the plant's requirements to complete a mixed dissolution-adjusted fertilizer.

[0040] More specifically, Figure 1 is a flowchart illustrating a method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils and fats according to an embodiment of the present invention.

[0041] The following describes in detail, with reference to Figure 1, a method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils and fats according to an embodiment of the present invention.

[0042] 1. Mixture formation stage (first stage) In this stage, natural oils and seaweed-dispersed colloids are mixed to produce a mixture.

[0043] Here, natural oils and fats are one 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, flaxseed oil, cotton oil, olive oil, safflower oil, lard oil, etc.

[0044] Furthermore, seaweed is generally a term used to refer to all photosynthetic organisms that inhabit the sea, including algae that emerge from the ocean. Unlike land plants, it does not have clearly separated organs such as roots, stems, and leaves, but is a thallus composed entirely of leaves. These are broadly divided into three types: green algae, brown algae, and red algae. In this invention, any seaweed available in this field can be used, specifically one or more types from among blue seaweed, blue horn, blue dwarf seaweed, wakame, kelp, rock seaweed, nori, Sargassum, agar, and carrageenan. Such seaweed is mainly those with no commercial value, but reusable seaweed can also be used.

[0045] Such seaweed is crushed and used in a dispersed colloidal form. Crushing can be done manually or automatically using any crushing equipment available in the field, such as a vol mill or blade mill. The crushing time is not particularly limited in this invention and can be appropriately adjusted depending on the operator's environment.

[0046] In this stage, the elution rate is adjusted by adding and mixing seaweed-dispersed colloids with natural oils in a specific ratio. Specifically, the natural oils and seaweed-dispersed colloids are mixed in a weight ratio of 1:0.1 to 1:10; deviating from this range will cause problems in adjusting the desired elution rate.

[0047] 2. Primary coating (second stage) In this stage, the mixture prepared in the first stage is heated and melted, and then this is used as a coating material to apply a primary coating to the surface of the granular fertilizer.

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

[0049] At this stage, the objective is to ensure that the coating agent is sufficiently applied to the surface of the granular fertilizer through one or more repeated coatings.

[0050] In other words, in this stage, the surface of the granular fertilizer is pre-coated with the mixture produced in the first stage in a weight ratio of 1:0.001 to 0.02, and if necessary, post-coating is performed by layering the mixture produced in the first stage again in a weight ratio of 1:0.001 to 0.02 on the surface of the granular fertilizer after the pre-coating is completed.

[0051] Furthermore, at this stage, it is desirable that the total content of the coating mixture used in pre-coating and post-coating be 1% or less relative to 100% of the granular fertilizer. This is because if the total content of the coating material exceeds 1%, a clumping phenomenon will occur between the granular fertilizer particles.

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

[0053] By applying such a secondary coating, rapid hardening and surface planarization can be induced, preventing cracking.

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

[0055] The clay powder consists mainly of one or more of the zeolite, bentonite, attapulgite, and perlite available in this field.

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

[0057] 4. Completion stage of mixed leaching controlled fertilizer (Stage 4) In this stage, the fertilizers that are released at specific points in time, generated in stages 1 through 3, are mixed according to the plant's requirements to complete the mixed release-controlled fertilizer.

[0058] In other words, at this stage, in order to adjust the timing of fertilizer effectiveness according to the plant requirements, either the content of the seaweed-dispersed colloid mixed with the natural oil is adjusted in the first stage, or a process is carried out in which fast-acting fertilizer and slow-release fertilizer, manufactured by varying the number of primary and secondary coatings performed in the second and third stages, are mixed in a weight ratio suitable for the plant requirements.

[0059] Specifically, in this stage, the mixture produced in the first stage has a different component content, or in the third stage, various types of coated fertilizers (or uncoated fertilizers) containing specific nutrients are mixed so that their effects appear at a specific time, according to the timing of the plant's nutrient requirements.

[0060] Furthermore, at this stage, the timing of fertilizer effect can be adjusted by mixing coated fertilizers in which the number of primary and secondary coatings in the second and third stages are adjusted according to the type of fertilizer required for the plants. For example, when producing a fertilizer that requires a fast-acting coating, the primary coating in the second stage can be omitted, or only the pre-coating in the secondary coating of the third stage can be performed and mixed in. In addition, if even faster action is required, uncoated fertilizer can also be mixed in.

[0061] Furthermore, at this stage, for fertilizers containing fast-acting nutrients, the amount of seaweed-dispersed colloid added in the first stage is reduced, and for fertilizers containing slow-acting nutrients, the content of seaweed-dispersed colloid is increased in the first stage. After completing the process up to the third stage, the slow-acting or fast-acting fertilizers are mixed according to the plant-specific requirements, thereby completing the production of fertilizers in which the timing of fertilizer effect is adjusted according to each nutrient.

[0062] Furthermore, at this stage, the fertilizers whose effectiveness is regulated at a specific point in time are one type or a combination of two or more types.

[0063] Thus, coated granular fertilizers, whose elution rate and timing of fertilizer release are adjusted by the content of seaweed-dispersed colloid mixed with natural oils produced in the aforementioned first to third or first to fourth stages, are coated with a natural coating material. The addition of seaweed-dispersed colloid to the natural oil accelerates hardening, causing the coating film to harden and thus achieving slow-release properties. This is environmentally friendly, significantly enhances the coating effect, and prevents cracking and hardening of the granular fertilizer. Furthermore, by adjusting or specifying the timing of fertilizer release, it is possible to supply specific nutrients to plants at the time they require them with a single application.

[0064] On the other hand, if the hardening rate is slow during actual factory production, the production efficiency of coated fertilizer will decrease. Therefore, by using clay powder or silicon dioxide coating, it is possible to induce the colloidal coating to harden in a short time, thereby preventing cracking and flattening the surface. For this reason, during actual factory production, by doing so, it is possible to mix clay powder or silicon dioxide after the primary coating, complete the secondary coating, and then complete production. After the production of coated fertilizer is complete, a stabilization stage occurs during storage or transportation. In this case, if the third stage described above is not performed, solidification, cracking, and powdering will occur between the products.

[0065] The present invention will be described in more detail below with reference to examples. However, the following examples are merely illustrative and not limiting to the present invention.

[0066] <Example> Production of the granular fertilizer of the present invention A mixture of natural oil (palm oil) and wakame seaweed dispersion colloid was prepared in a weight ratio of 1:5.

[0067] The mixture was heated for 30 minutes until it melted, then the temperature was lowered to 50°C. This was used as a coating material to coat granular fertilizer in a weight ratio of 1:0.001 to 0.02 (granular fertilizer:mixture).

[0068] Granular fertilizer was manufactured by coating primary coated granular fertilizer with clay powder in a weight ratio of 1:0.001 to 0.02 (granular fertilizer:clay powder).

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

[0070] To investigate the coating effect of a granular fertilizer with controlled dissolution rate, produced by a method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed-dispersed colloid mixed with natural oils according to an embodiment of the present invention, an underwater dissolution test was measured using an EC test.

[0071] The changes in electrolyte concentration in water over time while the sample was left standing are shown in Table 1 below, and the results are shown graphically in Figure 2. [Table 1]

[0072] Comparative example: Control group (highly soluble fertilizer) Example 1: Fertilizer with weakened coating Example 2: Comparative Example: Fertilizer mixed in a ratio of 3:3:4 (Example 1:Example 3). Example 3: Fertilizer with stronger coating

[0073] Referring to Table 1 and Figure 2, it can be seen that the comparative examples, which were not coated at all, dissolved within 10 minutes of being placed in water, while Examples 1 to 3 dissolved slowly over time. From the changes in the composition of the vegetable oil, which is the coating material produced in the first stage, it can be seen that the dissolution rate of Example 1, in which the coating strength was set to be slightly weaker, was higher than that of Example 3, in which the coating strength was set to be stronger.

[0074] Specifically, Example 1 is a fertilizer that has progressed to the pre-coating stage in the third stage, Example 3 is a fertilizer that has progressed from the third stage to the post-coating stage, and Example 2 is a fertilizer that is a mixture of a comparative example in which no coating was performed at all 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] Example 2 shows that the elution rate falls between that of the comparative example and Examples 1 and 3. This demonstrates that by changing the composition of the mixture produced in the first step, it is possible to produce fertilizers with various coating capabilities, and that by combining these various combinations, it is possible to produce elution-controlled organic fertilizers that can be adjusted to elute at a desired time.

[0076] Thus, by adding a natural seaweed-dispersed colloid to natural oils, a synergistic effect is created with the components of the natural oils. When coated with this substance, the coating effect can be maximized, suggesting that both slow-release and leaching control functions can be obtained simultaneously. This suggests that it will be possible to produce leaching-controlled organic fertilizers coated with 100% natural materials in the domestic fertilizer market in the future, which is of great importance to eco-farming.

[0077] As mentioned above, the specific details of the present invention are provided by the examples, but since these examples merely illustrate 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 the claims and equivalent concepts described later. Industrial applicability

[0078] The present invention provides a method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils. This method uses eco-friendly materials made only from natural raw materials instead of synthetic resins that are harmful to the environment. The granular fertilizer is coated with eco-certified materials, has the potential to be used with automated equipment due to the prevention of solidification, and has enhanced slow-release properties, thereby reducing the amount of application and the number of applications. Since a multi-layer coating using eco-coating material is formed on the surface of the granular fertilizer, the loss of nutrients from the granular fertilizer can be minimized, preventing green algae and red tide phenomena, and minimizing the problem of soil and river environmental pollution caused by residual chemical coating materials. By coating the surface of the granular fertilizer coated with eco-friendly materials with naturally derived clay powder, the coating effect is maximized by promoting rapid hardening when the natural substance coating layer is formed, and solidification is dramatically prevented. By adjusting the timing of fertilizer effect of the eco-fertilizer, the fertilizer effect can be exerted in accordance with the nutrient requirements at each stage of plant and crop growth with a single application, thereby reducing agricultural labor and the amount of fertilizer applied, and thus has industrial applicability.

Claims

1. A first step involves mixing natural oils and seaweed-dispersed colloids to produce a mixture, In the second step, the mixture prepared in the first step is heated and melted, and this is used as a coating material to perform a primary coating on the surface of the granular fertilizer. A method for producing coated granular fertilizer, wherein the elution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils, comprising 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.

2. A method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils according to claim 1, characterized in that it includes a fourth step of mixing fertilizers that are dissolved at specific time points, generated in the first to third steps, according to the requirements of plants, to complete a mixed dissolution-adjusted fertilizer.

3. The aforementioned natural oils and fats include one 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, flaxseed oil, cotton oil, olive oil, safflower oil, and lard oil. A method for producing coated granular fertilizer, characterized in that the seaweed includes one or a combination of two or more types from among blue seaweed, blue horn, blue dwarf seaweed, wakame, kelp, rock seaweed, nori, Sargassum, agar, and carrageenan, wherein the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with the natural oil according to claim 1.

4. A method for producing coated granular fertilizer, characterized in that, in the first step, natural oil and seaweed dispersed colloid are mixed in a weight ratio of 1:0.1 to 1:10, wherein the elution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with the natural oil according to claim 1 or 3.

5. A method for producing coated granular fertilizer, 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 cool at a temperature of 15 to 25°C until it reaches a temperature of 50 to 60°C, wherein the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with the natural oil according to claim 1.

6. A method for producing coated granular fertilizer, in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils, as described in claim 1, characterized in that, in the second stage, the mixture produced in the first stage 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 stage is layered again on the surface of the granular fertilizer after the pre-coating is completed in a weight ratio of 1:0.001 to 0.02 to perform post-coating.

7. A method for producing coated granular fertilizer, characterized in that the clay powder contains one or more of zeolite, bentonite, attapulgite, and perlite, wherein the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with the natural oil according to claim 1.

8. A method for producing coated granular fertilizer, characterized in that in the third step, the clay powder is applied as a secondary coating to the surface of the primary coated granular fertilizer in a weight ratio of 1:0.001 to 0.02 to induce hardening on the surface of the granular fertilizer, form a surface flattening, and prevent clumping between the granular fertilizer particles, thereby producing granular fertilizer, as described in claim 1 or claim 7, wherein the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oils and fats.

9. The method for producing coated granular fertilizer in which the dissolution rate and timing of fertilizer effect are adjusted by the content of seaweed mixed with natural oil according to claim 2, characterized in that, in the fourth step, in order to adjust the timing of fertilizer effect according to the requirements of each plant, the content of seaweed mixed with the natural oil in the first step is adjusted, or fast-acting fertilizer and slow-release fertilizer produced by differently performing primary and secondary coatings in the second and third steps are mixed in a weight ratio suitable for the requirements of each plant.

Images