Preparation method of coated granular fertilizer capable of adjusting dissolution rate and fertilizer efficiency time according to content of seaweed mixed with natural oil and fat

Abstract

The present invention relates to a method for preparing a coated granular fertilizer in which the dissolution rate and the fertilizer efficiency time are adjusted according to the content of algae mixed with natural oils and fats, and more particularly, to a method for preparing a coated granular fertilizer in which the dissolution rate and the fertilizer efficiency time are adjusted according to the content of algae mixed with natural oils and fats, and more particularly, to a method for preparing a coated granular fertilizer in which the dissolution rate and the fertilizer efficiency time are adjusted according to the content of algae mixed with natural oils and fats. Comprising the following steps: 1, mixing natural oil and algae dispersion colloid to generate a mixture; a second step of heating and melting the mixture mixed in the first step, and coating the surface of the granular fertilizer for the first time by using the mixture as a coating material; a third step of performing a second coating using a clay powder or silica on the surface of the first coated granular fertilizer generated in the second step to induce solidification; and a fourth step of mixing the fertilizers dissolved out for a specific time generated in the first to third steps in accordance with the demand of the plant to complete the mixed dissolution regulation of the fertilizer.

Description

Technical Field

[0001] The present invention relates to the development of an environmentally friendly coating material capable of adjusting the dissolution rate and a method for preparing a coated granular fertilizer using the same, wherein the fertilizer effect time of the coated granular fertilizer can be adjusted. Background Art

[0002] Generally, fertilizers are used to supply nutrients to edible plants and ornamental plants or promote their growth, and can be regarded as substances that supply nutrients to plants through water or nutrient solutions dissolved in water.

[0003] This type of fertilizer can be divided into slow-release fertilizers, quick-acting fertilizers, chemical fertilizers and organic fertilizers.

[0004] Among them, slow-release fertilizer is a term for quick-release fertilizers that take effect quickly (such as ammonium sulfate) when applied to the soil. It refers to fertilizers whose effects are slowly manifested. The disadvantages of quick-release fertilizers are that they not only cause temporary concentration barriers and excess nutrients, but are also prone to loss or failure. In addition, they require more effort because they need to be applied multiple times.

[0005] Fertilizers for compensating for the disadvantages of the aforementioned fertilizers are slow-release fertilizers, and various slow-release fertilizers are being developed as nitrogen fertilizers.

[0006] In addition, slow-release fertilizers reduce the ratio of water-soluble components during the preparation process and make the water-soluble components decompose slowly, or use special materials to coat them to reduce the dissolution rate.

[0007] Such existing slow-release fertilizers can be divided into the following categories.

[0008] First, Isobutylidene diurea (IBDU) is a fertilizer made by mixing urea and aldehyde to slowly release nitrogen due to its insolubility in water. It is also referred to as IB. It is a granular fertilizer with a particle size of 1.7mm to 4.0mm. Half of the nitrogen is IB nitrogen and the other half is fast-acting ammonia nitrogen, which is effective in the early growth stage and lasts until the later stage. Compared with CDU, which requires the action of microorganisms to dissolve, IBDU has the characteristic of only dissolving slowly in water.

[0009] Moreover, Crotonylidene diurea (CDU) is a slow-release nitrogen fertilizer and a compound fertilizer that also contains phosphorus fertilizer and potash fertilizer. It is made by reacting urea with acetaldehyde and is almost insoluble in water. Its chemical structure is similar to that of a tortoise shell, so the nitrogen attached to the side branches is easily dissolved in water and released, while the components in the tortoise shell need to be decomposed by microorganisms after a considerable period of time before they can be released, so it has the characteristic of maintaining its effect for a long time.

[0010] Urea formaldehydes (UF) is a slow-release nitrogen fertilizer that is produced by the reaction of urea and formaldehyde to form methylene urea. Urea formaldehyde is an odorless, white solid with a nitrogen content of 38% to 42%. Depending on the amount of urea mixed with formaldehyde, it produces a variety of urea such as urea that is easily soluble in water and urea that is difficult to dissolve in water, so its effect lasts for a long time. In addition, it has the following characteristics: it does not contain harmful ingredients, does not cause crop concentration barriers, and does not deteriorate the soil.

[0011] Meanwhile, coated compound fertilizer is a kind of fertilizer that is coated with a layer of film (which can allow half of the water to enter or prevent water from entering) on ​​the outer shell of granular quick-acting fertilizer, so that the fertilizer components can be slowly dissolved through the small holes on the film. Because it is coated with a film, it is also called "coated fertilizer". It is a compound fertilizer that contains both phosphate and potassium and dissolves slowly together. The characteristics of nitrogen in this fertilizer are that there is almost no denitrification and dissolution, and the effect is late and lasting.

[0012] On the other hand, chemical fertilizers and slow-release fertilizers are composed of the same chemical substances as chemical fertilizers, and therefore have various side effects such as reducing soil fertility by acidifying the soil and causing environmental pollution when provided as nutrients to edible plants.

[0013] And, in order to solve this problem, environmental pollution can be prevented by mixing and incorporating compost (i.e., animal manure, chicken manure, fish) as organic fertilizers, plant fibers (such as sawdust) into the soil.

[0014] However, for different plants or animal manure, chicken manure, fishery by-products and sawdust, the nutritional components of feed and the production environment of compost will be different depending on the period and the condition and environment of livestock. Therefore, the following problem will arise: due to the different nutritional components of each, the nutritional components required by different edible plants are different, not only can high-quality edible plants not be produced, but different growers and cultivation areas produce edible plants of different qualities.

[0015] In addition, when pathogenic bacteria are contained in compost, there is a problem of providing a harmful environment that is fatal to edible plants.

[0016] Therefore, it is necessary to develop a coating technology for organic fertilizers, which is in a granular form, can provide nutrients to plants, and uses environmentally friendly materials that do not contain harmful substances.

[0017] In addition, plants have different nutrient requirements depending on the growth period of crops, so in traditional agriculture, this is dealt with by spraying fertilizers adapted to the growth period of crops twice or more. However, for reasons of labor and cost saving, the method of spraying fertilizers once to adjust the fertilizer effect time is generally used.

[0018] However, the time when the effect of fertilizer appears is very difficult to adjust. In the existing chemical coating method, methods such as stacking are used to adjust the fertilizer effect time. However, in the coating method using natural substances, there are problems such as the uniformity of natural substances, the slow effect compared to the chemical coating method, and the limitations of stacking. Therefore, a new method for adjusting the fertilizer effect time is needed. Summary of the invention

[0019] Technical Problems to be Solved by the Invention

[0020] The present invention is proposed to solve the above-mentioned problems. The purpose of the present invention is to provide a method for preparing a coated granular fertilizer that adjusts the dissolution rate and the fertilizer effect time according to the content of seaweed mixed with natural oils and fats. The coated granular fertilizer is a coated granular fertilizer coated with environmentally friendly materials (only natural raw materials are used instead of synthetic resins). It can expand the usability of automated equipment by obtaining environmental certification and preventing solidification, and reduce the spraying amount and the number of operations by adjusting the fertilizer effect time.

[0021] In addition, the present invention aims to provide a method for preparing 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 oils and fats, wherein the preparation method can prevent green tide and red tide phenomena by minimizing the loss of nutrients in the granular fertilizer and minimize the environmental pollution problems of soil and rivers caused by the residue of chemical coating materials.

[0022] Technical Solution

[0023] According to an embodiment of the present invention, the present invention provides a method for preparing a coated granular fertilizer that adjusts the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats, the method comprising:

[0024] In the first step, natural oil and seaweed dispersed colloid are mixed to form a mixture;

[0025] The second step is to heat and melt the mixture mixed in the first step, and then use it as a coating material to coat the surface of the granular fertilizer for the first time;

[0026] A third step is to perform a second coating using clay powder or silicon dioxide on the surface of the first coated granular fertilizer produced by the second step to induce solidification; and

[0027] The fourth step is to mix the fertilizers dissolved at a specific time generated through the first step to the third step according to the demand of the plant to complete the mixed dissolved regulated fertilizer.

[0028] In a preparation method of an implementation example of the present invention, the natural oil includes one or a combination of two or more selected from the natural oil group consisting of palm oil, coconut oil, soybean oil, corn oil, peanut oil, palm kernel oil, sunflower oil, rapeseed oil, grape seed oil, linseed oil, cottonseed oil, olive oil, safflower oil and lard, and the seaweed includes one or a combination of two or more selected from the group consisting of sea lettuce, spiny pine algae, indigo, undaria pinnatifida, kelp, sea lettuce, glycoside moss, micro-lao sargassum, agar, nori and carrageenan.

[0029] In the preparation method of an implementation example of the present invention, the first step includes: a step of mixing natural wax and seaweed in a ratio of 1:0.1 to 1:10.

[0030] In a preparation method of an implementation example of the present invention, the mixture is fully stirred and heated for 30 minutes at a temperature of 80°C to 100°C to melt it, and then placed and cooled at a temperature of 15°C to 25°C until the temperature reaches 50°C to 60°C.

[0031] In the preparation method of one embodiment of the present invention, the second step includes: pre-coating the mixture generated by the first step on the surface of the granular fertilizer at a weight ratio of 1:0.001 to 0.02, and stacking the mixture generated by the first step on the surface of the pre-coated granular fertilizer at a weight ratio of 1:0.001 to 0.02 to perform a post-coating step.

[0032] In the preparation method of an implementation example of the present invention, the clay powder includes one or a combination of two or more of zeolite, bentonite, attapulgite and perlite.

[0033] In the preparation method of one embodiment of the present invention, in the third step, in order to induce surface solidification of the granular fertilizer and form surface flatness at the same time, and to prevent agglomeration between the granular fertilizers, the clay powder is coated for a second time on the surface of the first-coated granular fertilizer at a weight ratio of 1:0.001 to 0.02 to prepare the granular fertilizer.

[0034] In the preparation method of one embodiment of the present invention, in the fourth step, in order to adjust the fertilizer effect time according to the fertilizer requirement of each plant, the quick-acting fertilizer and the slow-release fertilizer are mixed in a weight ratio matching the requirement of each plant, and the quick-acting fertilizer and the slow-release fertilizer are prepared by adjusting the content of seaweed mixed with the natural oil in the first step, or by changing the number of first coating and second coating performed through the second step and the third step.

[0035] In addition, according to another embodiment of the present invention, the present invention provides a coated granular fertilizer that adjusts the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats, which is prepared by the preparation method of the present invention.

[0036] Beneficial Effects

[0037] The present invention may relate to a coated granular fertilizer coated with an environmentally friendly material (using only natural raw materials instead of synthetic resins), which can expand the usability of automated equipment by obtaining environmental certification and preventing solidification, and reduce the amount of spraying and the number of operations by enhancing slow release.

[0038] In addition, in the present invention, a multi-layer coating layer using environmentally friendly coating materials is formed on the surface of the granular fertilizer, thereby not only minimizing the nutrient loss of the granular fertilizer, but also preventing green tide and red tide phenomena, and minimizing the environmental pollution problems of the soil and rivers caused by the residue of chemical coating materials.

[0039] Furthermore, the present invention further coats the surface of the granular fertilizer coated with environmentally friendly materials with clay powder derived from nature, thereby promoting rapid solidification when forming a coating layer of natural substances, thereby maximizing the coating effect and significantly preventing agglomeration.

[0040] According to the present invention, the effective time of the environmentally friendly fertilizer can be adjusted, so that the fertilizer effect can be exerted according to the nutrient requirements of plants and crops in various growth stages by spraying the fertilizer once, thereby reducing agricultural labor and the amount of fertilizer sprayed. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a graph showing the fertilizer surface after 1 minute in the 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).

[0042] Figure 2 is an image that graphically illustrates the cracking phenomenon caused by the difference in swelling degree between sodium bentonite and chemical resin in water. DETAILED DESCRIPTION

[0043] Hereinafter, when it is determined that the detailed description of the related known technology unnecessarily confuses the gist of the present invention, the detailed description will be omitted. In addition, the numbers used in the description process of this specification are only used as identification symbols for distinguishing one component from another component.

[0044] In addition, the terms used in this specification and claims should not be interpreted restrictively as their dictionary meanings, but should be interpreted based on the principle that the inventor can appropriately define the concept of the term in order to best explain his invention, and with the meaning and concept that are consistent with the technical idea of ​​the present invention.

[0045] Therefore, the embodiments described in this specification and the structures shown in the accompanying drawings are merely preferred embodiments of the present invention and do not express all the technical ideas of the present invention. Therefore, it should be understood that when applying for the present invention, there may be multiple equivalents and modifications that can replace these.

[0046] The preferred embodiments of the present invention will be described in more detail, and for the sake of brevity, well-known technical parts will be omitted or simplified.

[0047] An embodiment of the present invention provides a method for preparing a coated granular fertilizer that adjusts the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats, and the preparation method comprises:

[0048] In the first step, natural oil and seaweed dispersed colloid are mixed to form a mixture;

[0049] The second step is to heat and melt the mixture mixed in the first step, and then use it as a coating material to coat the surface of the granular fertilizer for the first time;

[0050] A third step is to perform a second coating using clay powder or silicon dioxide on the surface of the first coated granular fertilizer produced by the second step to induce solidification; and

[0051] The fourth step is to mix the fertilizers dissolved at a specific time generated through the first step to the third step according to the demand of the plant to complete the mixed dissolved regulated fertilizer.

[0052] More specifically, Figure 1 The present invention is a flowchart showing a method for preparing 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 oils and fats, which is an implementation example of the present invention.

[0053] Below, refer to Figure 1 The method for preparing the coated granular fertilizer for adjusting the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats according to the embodiment of the present invention is described in detail.

[0054] 1. Mixture generation step (first step)

[0055] In this step, the natural oil and the seaweed dispersed colloid are mixed to form a mixture.

[0056] The natural oil can be one or a combination of two or more selected from the group consisting of palm oil, coconut oil, soybean oil, corn oil, peanut oil, palm kernel oil, sunflower oil, rapeseed oil, grapeseed oil, linseed oil, cottonseed oil, olive oil, safflower oil and lard.

[0057] In addition, seaweed generally refers to all photosynthetic organisms that inhabit the ocean, which is a term that collectively refers to algae in the ocean. Unlike terrestrial plants, the seaweed does not have clearly differentiated organs, such as roots, stems and leaves, but is a thallus composed entirely of leaves. It can be roughly divided into three types: green algae, brown algae and red algae. In the present invention, all seaweeds that can be used in the art can be used, specifically, one or more combinations of seaweed, spiny pine algae, indigo, undaria, kelp, seaweed, glycoside moss, micro-labor sargassum, agar, seaweed and carrageenan can be used. These seaweeds can mainly use seaweed without commercial value, and recyclable seaweeds can also be used.

[0058] The seaweed is crushed and used in the form of a dispersed colloid. The crushing can be performed manually or automatically using any crushing device available in the art, and as an example, a ball mill or a blade mill can be used. The crushing time is not particularly limited in the present invention and can be appropriately adjusted according to the environment of the worker.

[0059] In this step, the dissolution rate can be adjusted by adding and mixing the seaweed dispersed colloid into the natural oil at a certain ratio. Specifically, the natural oil and the seaweed dispersed colloid are mixed at a weight ratio of 1:0.1 to 1:10. When the weight ratio exceeds this range, the problem of not being able to adjust the desired dissolution rate may occur.

[0060] 2. First coating (second step)

[0061] In this step, after the mixture mixed in the first step is heated and melted, it is used as a coating material to perform the first coating on the surface of the granular fertilizer.

[0062] First, in this step, the mixture can be fully stirred and heated for 30 minutes at a temperature of 80°C to 100°C to melt it, and then placed and cooled at a temperature of 15°C to 25°C until the temperature reaches 50°C to 60°C.

[0063] The purpose of this step is to allow the coating agent to be fully coated on the surface of the granular fertilizer by repeating the coating once or twice or more.

[0064] That is, in this step, the mixture generated by 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 if necessary, the mixture generated by the first step is again layered on the surface of the pre-coated granular fertilizer at a weight ratio of 1:0.001 to 0.02 for post-coating.

[0065] Furthermore, in this step, the total content of the coating mixture used in the pre-coating and post-coating is preferably less than 1% relative to 100% of the granular fertilizer. This is because when the total content of the coating material exceeds 1%, agglomeration may occur between the granular fertilizer particles.

[0066] 3. Second coating (third step)

[0067] In this step, a second coating using clay powder or silicon dioxide is performed on the surface of the first coated granular fertilizer produced by the second step to induce solidification.

[0068] This second coating can be performed to induce rapid solidification and surface flattening and prevent cracks.

[0069] In addition, in this step, depending on the implementation situation, in order to induce rapid solidification and surface flattening on the surface of the granular fertilizer and prevent cracks while preventing agglomeration between the granular fertilizers, clay powder or silica can be coated for a second time on the surface of the first coated granular fertilizer at a weight ratio of 1:0.001 to 0.02.

[0070] The clay powder may mainly be one or a combination of two or more of zeolite, bentonite, attapulgite and perlite available in the technical field.

[0071] In the present invention, silicon dioxide other than clay powder may be used as a natural substance.

[0072] 4. Completion step of mixing and dissolving the fertilizer (the fourth step)

[0073] In this step, the fertilizers dissolved at a specific time generated through the first step to the third step are mixed according to the demand of the plant to complete the mixed dissolved regulated fertilizer.

[0074] That is, the following process is performed in this step: in order to adjust the fertilizer effect time according to the fertilizer requirement of each plant, the quick-acting fertilizer and the slow-release fertilizer are mixed in a weight ratio matching the requirement of each plant, and the quick-acting fertilizer and the slow-release fertilizer are prepared by adjusting the content of the seaweed dispersed colloid mixed with the natural oil in the first step, or by changing the number of the first coating (performed through the second step) and the second coating (performed through the third step).

[0075] Specifically, in this step, a plurality of coated fertilizers (or uncoated fertilizers) are mixed, and the plurality of coated fertilizers are prepared by changing the component content of the mixture generated in the first step, or are prepared by coating the fertilizer containing specific nutrients in the third step in such a way that the fertilizer effect is produced at a specific time according to the nutrient demand time of the plant.

[0076] In addition, in this step, the fertilizer effect time can be adjusted by mixing coated fertilizers according to the type of fertilizers required by the plants, and the coated fertilizers are fertilizers that adjust the number of times of the first coating and the second coating in the second and third steps. For example, when preparing fertilizers that require quick-acting coating, fertilizers that are not subjected to the first coating in the second step, or fertilizers that are only pre-coated in the second coating in the third step can be mixed, and when quick-acting properties are further required, uncoated fertilizers can also be mixed.

[0077] In addition, in this step, for fertilizers that require fast-acting nutrients, the amount of seaweed dispersed colloid added in the first step is reduced, and for fertilizers that require slow-release nutrients, the content of seaweed dispersed colloid in the first step is increased. Therefore, after the process of the third step is completed, fertilizers that require slow release or fertilizers that require fast-acting nutrients are mixed in a manner that matches the needs of each plant, thereby completing the preparation of fertilizers that adjust the fertilizer effect time according to each nutrient.

[0078] In addition, in this step, the fertilizer that can adjust the fertilizer effect at a specific time can be one or a combination of two or more.

[0079] As described above, the coated granular fertilizer prepared by the aforementioned first step to the third step or the first step to the fourth step, which adjusts the dissolution rate and fertilizer effect time according to the content of the seaweed dispersed colloid mixed with natural oils and fats, uses a natural coating material for coating, and adds seaweed dispersed colloids to natural oils and fats (oils), so it is quickly solidified, and as the coating becomes firm, a slow release can be obtained, which is not only environmentally friendly, but also can significantly improve the coating effect, and can prevent cracks and agglomeration of granular fertilizers. In addition, by adjusting or specifying the fertilizer effect time, it can be regulated by spraying once in a manner that specific nutrients are supplied separately at the time required by the plant.

[0080] On the other hand, when prepared in an actual factory, if the curing speed is slow, the production efficiency of the coated fertilizer is reduced, so the colloidal coating can be induced to cure in a short time by clay powder or silica coating, and cracks can be prevented and surface flattening can be induced. Therefore, when prepared in an actual factory, according to the implementation situation, after the first coating, the second coating can also be completed by mixing clay powder or silica, thereby completing the production. In the storage or transportation step after the production of the coated fertilizer is completed, a stabilization step will be generated. In this case, if the third step is not performed, solidification, cracks, powder and other phenomena between products may occur.

[0081] Hereinafter, the present invention will be described in more detail by the following examples. However, the following examples are only used to illustrate the present invention, and the scope of the present invention is not limited to these.

[0082] <Example> Preparation of granular fertilizer of the present invention

[0083] Natural oil (palm oil) and kelp dispersion colloid were mixed in a weight ratio of 1:5.

[0084] The mixture was heated and melted for 30 minutes, then cooled to 50°C and used as a coating material to coat granular fertilizer at a weight ratio of 1:0.001 to 0.02 (granular fertilizer: mixture).

[0085] The granular fertilizer was prepared by coating the clay powder on the first coated granular fertilizer at a weight ratio of 1:0.001 to 0.02 (granular fertilizer: clay powder).

[0086] <Experimental example> Coating test and dissolution test

[0087] Figure 2 : is a graph showing the change of electrolyte concentration in water over time in the slow-release granular fertilizers according to the examples of the present invention and the comparative examples.

[0088] In order to understand the coating effect of the dissolution-regulated granular fertilizer prepared by the method for preparing a coated granular fertilizer in which the dissolution rate and the fertilizer effect time are adjusted according to the content of seaweed dispersed colloids mixed with natural oils and fats in an embodiment of the present invention, a water dissolution test was carried out through an EC (electrical conductivity) test.

[0089] The changes in the electrolyte concentration in water with the passage of time when the electrolyte was left standing in water are shown in Table 1 below, and the results are shown in a graph. Figure 2 middle.

[0090] Table 1

[0091] 0 minutes 10 minutes 30 minutes 1 hour 2 hours 24 hours Comparative Example 0 16.02±0.25 17.05±0，01 18.02±0.02 18.01±0.15 18.75±0.56 Example 1 0 4.52±0.26 6.97±0.53 8.95±0.06 13.31±0.56 19.87±0.57 Example 2 0 7.85±0.53 11.87±0.35 13.72±0.65 15.02±0.99 19.38±0.49 Example 3 0 2.24±0.07 3.93±0.19 6.64±0.26 10.53±0.65 18.26±0.26

[0092] The comparative example is a control group (easily soluble fertilizer); Example 1 is a fertilizer with a weaker coating.

[0093] Example 2 is a comparative example: Example 1: Example 3 is a fertilizer mixed in a ratio of 3:3:4.

[0094] Example 3 is to produce a stronger coated fertilizer.

[0095] Referring to Tables 1 and 2, it can be seen that the comparative example without any coating dissolved completely in less than 10 minutes after being put into water, while in Examples 1 to 3, the coating dissolved slowly over time. It can be seen that the dissolution rate of Example 1, which has a weaker coating force due to the change in the composition of the coating material vegetable oil generated in the first step, is higher than the dissolution rate of Example 3, which has a stronger coating force.

[0096] That is, Example 1 is a fertilizer that has been pre-coated only in the third step, Example 3 is a fertilizer that has been post-coated in the third step, and Example 2 is a fertilizer obtained by mixing the comparative example that has not been coated at all, Example 1 that has been weakly coated, and Example 3 that has been strongly coated in the fourth step in a ratio of 3:3:4.

[0097] It can be confirmed that the dissolution rate of Example 2 is between the comparative example and Example 1 and Example 3. This shows that fertilizers having various coating forces can be prepared by changing the mixture components in the first step, and that dissolution-regulated organic fertilizers that can be regulated so that dissolution can be achieved at a desired time can be produced by various combinations thereof.

[0098] As shown above, adding the seaweed dispersion colloid of natural materials to natural fats and oils produces a synergistic effect with the natural fat components, and when the substance causing this effect is used for coating, the coating effect can be maximized, and the slow release and dissolution regulating functions can be obtained at the same time. This means that dissolution regulating organic fertilizers coated with 100% natural materials can be produced in the Korean fertilizer market in the future, so it has a very important significance in environmentally friendly farming methods.

[0099] As described above, the present invention is specifically described through embodiments, but the above embodiments are only preferred examples of the present invention for illustration, so the present invention should not be understood as being limited to the above embodiments, and the scope of rights of the present invention should be understood through the following claims and their equivalent concepts.

[0100] Industrial Applicability

[0101] As a method for preparing a coated granular fertilizer of the present invention that adjusts the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils, it can expand the availability of automated equipment by obtaining environmental certification and preventing solidification phenomenon and reduce the spraying amount and the number of operations by strengthening the slow release, wherein the coated granular fertilizer is a coated granular fertilizer coated with environmentally friendly materials (only natural material raw materials are used instead of synthetic resins). In addition, a multi-layer coating layer using environmentally friendly coating materials is formed on the surface of the granular fertilizer, so that not only the nutrient loss of the granular fertilizer can be minimized, but also the green tide and red tide phenomena can be prevented, and the environmental pollution problems of soil and rivers caused by the residue of chemical coating materials can be minimized. In addition, by further coating the surface of the granular fertilizer coated with environmentally friendly materials with clay powder derived from nature, rapid solidification is promoted when the coating layer of natural materials is formed, thereby maximizing the coating effect and significantly preventing the caking phenomenon. In addition, the present invention can adjust the fertilizer effect time of the environmentally friendly fertilizer, so that the fertilizer effect can be exerted according to the nutrient requirements of plants and crops in various growth periods by spraying the fertilizer once, thereby reducing agricultural labor and the amount of fertilizer spraying. In summary, the present invention has industrial applicability.

Claims

1. A method for preparing a coated granular fertilizer that adjusts the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats, characterized in that: include: The first step is to mix the natural oil and the seaweed dispersed colloid to form a mixture. The second step is to heat and melt the mixture mixed in the first step, and then use it as a coating material to coat the surface of the granular fertilizer for the first time, and In the third step, a second coating using clay powder or silicon dioxide is performed on the surface of the first coated granular fertilizer produced by the second step to induce solidification.

2. The method for preparing a coated granular fertilizer for adjusting the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats according to claim 1, characterized in that: The method comprises a fourth step of mixing the fertilizers dissolved at a specific time generated through the first step to the third step according to the demand of the plant to complete the mixed dissolved regulated fertilizer.

3. The method for preparing a coated granular fertilizer for adjusting the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats according to claim 1, characterized in that: The natural oil comprises one or a combination of two or more selected from the group consisting of palm oil, coconut oil, soybean oil, corn oil, peanut oil, palm kernel oil, sunflower seed oil, rapeseed oil, grape seed oil, linseed oil, cottonseed oil, olive oil, safflower oil and lard. The seaweeds include one or a combination of two or more of the following: seaweed, spinulosa, indigo, undaria, kelp, seaweed, sargassum, sphaerocephala, agar, nori and carrageenan.

4. The method for preparing a coated granular fertilizer for adjusting the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats according to claim 1 or 3, characterized in that: The first step comprises: mixing natural wax and seaweed in a weight ratio of 1:0.1 to 1:

10.

5. The method for preparing coated granular fertilizer according to claim 1, wherein the dissolution rate and fertilizer effect time are adjusted according to the content of seaweed mixed with natural oils and fats, characterized in that: In the first step, the mixture is stirred and heated at 80°C to 100°C for 30 minutes to be melted, and then allowed to stand and cool at 15°C to 25°C until the temperature reaches 50°C to 60°C.

6. The method for preparing coated granular fertilizer according to claim 1, wherein the dissolution rate and fertilizer effect time are adjusted according to the content of seaweed mixed with natural oils and fats, characterized in that: The second step comprises: The mixture produced by 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 the mixture produced by the first step is layered on the surface of the pre-coated granular fertilizer at a weight ratio of 1:0.001 to 0.02 to perform a post-coating step.

7. The method for preparing coated granular fertilizer according to claim 1, wherein the dissolution rate and fertilizer effect time are adjusted according to the content of seaweed mixed with natural oils and fats, characterized in that: The clay powder includes one or a combination of two or more of zeolite, bentonite, attapulgite and perlite.

8. The method for preparing a coated granular fertilizer according to claim 1 or 7, wherein the dissolution rate and fertilizer effect time are adjusted according to the content of seaweed mixed with natural oils and fats, characterized in that: In the third step, in order to induce surface solidification of the granular fertilizer and form surface flatness, and to prevent agglomeration between the granular fertilizers, the granular fertilizer is prepared by coating the clay powder on the surface of the first-coated granular fertilizer for a second time at a weight ratio of 1:0.001 to 0.

02.

9. The method for preparing coated granular fertilizer for adjusting dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats according to claim 2, characterized in that: In the fourth step, in order to adjust the fertilizer effect time according to the requirement of each plant, the quick-acting fertilizer and the slow-release fertilizer are mixed in a weight ratio matching the requirement of each plant, and the quick-acting fertilizer and the slow-release fertilizer are prepared by adjusting the content of seaweed mixed with the natural oil in the first step, or by changing the number of first coating and second coating performed through the second step and the third step.

10. A coated granular fertilizer that adjusts the dissolution rate and fertilizer effect time according to the content of seaweed mixed with natural oils and fats, characterized in that: The method for preparing the coated granular fertilizer according to claim 1, wherein the dissolution rate and the fertilizer effect time are adjusted according to the content of seaweed mixed with natural oils and fats.

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