Organic fertilizer and method for preparing the same

Abstract

Disclosed are a microbial organic compound fertilizer and a method for preparing the same. The organic fertilizer includes 60 to 80 parts by weight of castor meal and 1 to 15 parts by weight of rice bran. A coating layer is formed on at least a portion of the surface of the organic fertilizer by spraying, drying, and cooling a microbial culture solution.

Description

Technical Field

[0001] This invention relates to microbial organic compound fertilizers with improved mechanical properties and quality, and their preparation methods. Background Technology

[0002] Fertilizer is a general term for nutrients that enrich the soil of orchards or forests, including paddy fields and rice paddies, to promote the growth of crops or vegetation. Generally, unlike nutrients that are directly added to the soil or plants to maintain or enhance soil productivity and promote crop or vegetation growth, fertilizer can be defined as substances that indirectly aid crop growth, even if they do not directly become nutrients for crops. These substances improve the physicochemical properties of the soil, enhance or inhibit beneficial microorganisms, or convert nutrients that cannot be directly used by plants into a usable form, or reduce the toxicity of substances harmful to roots.

[0003] Higher plants absorb water and inorganic components as nutrients through their roots, and utilize solar energy to perform photosynthesis in their leaves, thereby synthesizing various organic substances necessary for growth. Native plants absorb nutrients in a designated location for growth and death, thus experiencing minimal nutrient loss from the soil within their habitat, allowing for optimal growth. In contrast, crops in farmland absorb nutrients existing in the soil's rhizosphere. Once growth is complete, the harvested produce is transported elsewhere, meaning the absorbed nutrients cannot be returned to the soil. Therefore, if the nutrients consumed by crops during their growth stages are not artificially supplied at appropriate times, crop productivity can decline year by year. Thus, to maintain or increase land productivity and sustain crop productivity, fertilization management based on crop type and soil type is necessary.

[0004] Therefore, in order to increase crop productivity, chemical fertilizers (inorganic fertilizers) began to be used continuously after 1960. When appropriate amounts of chemical fertilizers are used, the rapid growth of cultivated crops and the resulting increase in yield can be guaranteed. However, excessive fertilization can lead to soil acidification and salt disturbance caused by salt deposition. As the growth of microorganisms, which are the final decomposers, is inhibited, the soil ecosystem is destroyed, resulting in the degradation of farmland.

[0005] To address the aforementioned problems, organic fertilizers have been proposed as an alternative to chemical fertilizers. Organic fertilizers utilize microorganisms to ferment and decompose organic matter, providing usable nutrients for plants. When organic fertilizers are applied to the cultivation site, inorganic nutrients (N, P, K) and trace elements (Mg, Mn, Cu, B, Mo, etc.) are supplied as nutrients for the cultivated crops. This not only promotes growth but also provides physical porosity to the soil, thereby supplying amino acids, nucleic acids, organic acids, vitamins, etc., through a process that allows rhizosphere microorganisms to settle. Due to the organic acids secreted by the revitalized rhizosphere microorganisms, inorganic salts around the roots are ionized in a way that is easily absorbed by the crops, thus alleviating salt deposition in the cultivation site.

[0006] However, directly using raw materials such as livestock excrement, organic waste, or plant matter that contain raw materials for organic fertilizer presents problems such as difficulty in storage and use. Therefore, it is used in the form of solid organic fertilizer. Furthermore, when organic fertilizer is manufactured by incorporating microorganisms, it is usually applied by adding microorganisms to carriers such as straw, wood chips, or natural minerals. However, when microorganisms are contained in carrier form, the fertilization rate of the organic matter decreases or it is difficult to completely ferment, thereby reducing the soil modification effect and thus reducing the crop growth promotion effect.

[0007] Therefore, there is a need to develop technologies for organic fertilizers and their preparation methods that improve quality and increase crop productivity while making it easier for organic fertilizers to contain microorganisms. Summary of the Invention

[0008] Technical issues

[0009] The present invention addresses the aforementioned problems of the prior art by providing an organic fertilizer and a method for preparing the same, which can coat at least a portion of the surface of an organic fertilizer containing plant and animal matter with liquid microorganisms to improve its mechanical properties and quality, and result in excellent crop productivity.

[0010] Technical solution

[0011] According to one aspect, a microbial organic compound fertilizer is provided, which is an organic fertilizer comprising 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran, wherein the organic fertilizer includes a coating formed on at least a portion of the surface of the organic fertilizer, the coating being formed by spraying, drying and cooling a microbial culture solution.

[0012] In one embodiment, the organic fertilizer may further comprise at least one selected from the group consisting of 5 to 30 parts by weight of rapeseed oil meal, 1 to 5 parts by weight of palm oil meal, and 5 to 20 parts by weight of processed chicken manure.

[0013] In one embodiment, the microbial culture medium can be selected from the group consisting of Bacillus subtilis culture medium, Saccharomyces cerevisiae culture medium, Pseudomonas protegens culture medium, Aspergillus callestemii culture medium, Rhodotorula aurantiaca culture medium, Bacillus megaterium culture medium, Streptomyces costaricanus culture medium, Thermoascus thermophilus culture medium, and combinations of two or more of them.

[0014] In one embodiment, the thickness of the coating can be 10 μm to 50 μm.

[0015] In one embodiment, the average particle size of the above-mentioned organic fertilizer can be 1 mm to 10 mm.

[0016] In one embodiment, the organic fertilizer can be in granular or pellet form.

[0017] According to another aspect, a method for preparing a microbial organic compound fertilizer is provided, comprising: step (a), mixing and pulverizing 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran; step (b), molding the mixture of step (a) into granules or pellets to prepare organic fertilizer; step (c), spraying microbial culture solution onto the organic fertilizer to form a coating; and step (d), cooling and drying the product of step (c).

[0018] In one embodiment, step (a) above may further include mixing and crushing at least one of the following groups: 5 to 30 parts by weight of rapeseed oil meal, 1 to 5 parts by weight of palm oil meal, and 5 to 20 parts by weight of processed chicken manure.

[0019] In one embodiment, step (c) includes: adding organic fertilizer into the interior of a roller coating machine; and spraying microbial culture solution into the interior of the coating machine, wherein the microbial culture solution is sprayed while the coating machine is rotating, and the application of the organic fertilizer is performed.

[0020] In one embodiment, the cooling and drying in step (d) above can be performed at a temperature of 0°C to 10°C.

[0021] Technical effect

[0022] In one aspect of microbial organic compound fertilizers and their preparation methods, the high NPK content results in fewer weeds generated during fertilization and no foul odor, thus offering excellent usability. Furthermore, the use of liquid-phase microbial culture broth to form a coating enhances the mechanical properties, storage stability, and quality of the organic fertilizer.

[0023] The effects of this specification are not limited to those described above, but should be understood to include all effects that can be inferred from the detailed description or the scope of the invention claims. Attached Figure Description

[0024] Figure 1 The diagram illustrates a method for preparing a microbial organic compound fertilizer according to an embodiment of this specification.

[0025] Invention Implementation Form

[0026] Hereinafter, one aspect of this specification will be described with reference to the accompanying drawings. However, the matters described in this specification can be implemented by various different embodiments, and therefore, it is not limited to the embodiments described herein. Furthermore, in the accompanying drawings, parts unrelated to the description have been omitted for clarity, and similar reference numerals have been used for similar parts throughout the specification.

[0027] Throughout the specification, when it is mentioned that one part is "connected" to another part, it includes not only the case of "direct connection" but also the case of "indirect connection" with other components in between. Furthermore, when it is mentioned that a part "includes" a structural element, it means that other structural elements are included, rather than excluded, unless otherwise stated.

[0028] When numerical ranges are described in this specification, unless otherwise specified, the values ​​have the accuracy of significant figures provided in accordance with the standard rules in chemistry for significant figures. For example, 10 includes a range of 5.0 to 14.9, and the number 10.0 includes a range of 9.50 to 10.49.

[0029] Microbial organic compound fertilizer

[0030] According to one aspect, a microbial organic compound fertilizer is provided, which is an organic fertilizer comprising 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran, wherein the organic fertilizer includes a coating formed on at least a portion of the surface of the organic fertilizer, the coating being formed by spraying, drying and cooling a microbial culture solution.

[0031] Traditional organic fertilizers typically use livestock excrement, organic waste, or plant matter as primary raw materials. However, these materials are difficult to store and use, leading to their preparation as solids. In cases where livestock excrement or kitchen waste is used as the main raw material, artificial decomposition (fermentation) is necessary during the preparation process. This often results in a distinctive foul odor and the frequent growth of weeds when the waste is used as fertilizer.

[0032] The organic fertilizer described in this specification may contain 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran. Furthermore, depending on the applicable soil conditions or type, it may also contain at least one selected from the group consisting of 5 to 30 parts by weight of rapeseed oil meal, 1 to 5 parts by weight of palm oil meal, and 5 to 20 parts by weight of processed chicken manure. As described above, by including plant materials such as castor bean meal, rapeseed oil meal, palm oil meal, and rice bran, the NPK content relative to compost can be increased; and by including animal materials such as processed chicken manure, the organic matter content can be increased.

[0033] The castor bean meal, rapeseed oil meal, and palm oil meal mentioned above refer to the by-products remaining after oil extraction from the seeds used as raw materials. Specifically, castor bean meal is the by-product remaining after oil extraction from castor beans, rapeseed oil meal is the by-product remaining after oil extraction from rapeseed, and palm oil meal is the by-product remaining after oil extraction from palm seeds. Compared to animal-derived raw materials, these three products may contain relatively high nitrogen content.

[0034] For example, the castor meal content can be 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight, or 80 parts by weight, but is not limited to these. If the castor meal content exceeds the above range, the nitrogen content in the fertilizer can be reduced.

[0035] Furthermore, for example, the content of the rapeseed oil meal mentioned above may be 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, or 30 parts by weight, but is not limited to these. Similarly, for example, the content of the palm oil meal mentioned above may be 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, or 5 parts by weight, but is not limited to these.

[0036] If the fertilizer also contains rapeseed oil meal or palm oil meal, and the amounts of each component exceed the above ranges, the fertilizer's coatability may be reduced.

[0037] In addition, the aforementioned organic fertilizers may also include processed chicken manure. Generally, compared to cow and pig manure, chicken manure contains higher levels of waste components such as nitrogen, phosphate, and potassium, making it a valuable raw material for fertilizer. Since the composition of feed is generally constant, the composition of chicken manure does not vary significantly. However, the raw material itself has a high moisture content; therefore, to be used as fertilizer, it is usually processed through fermentation or drying. Chicken manure can be prepared into dried chicken manure, processed chicken manure undergoing a prescribed fermentation process, and composted manure that has undergone fermentation and decomposition. In particular, processed chicken manure undergoes a prescribed fermentation period, thus providing more stable crop growth compared to dried chicken manure, and compared to composted manure, the shorter fermentation period results in less nutrient loss.

[0038] The aforementioned processed chicken manure can be prepared by mixing chicken manure with sawdust and then fermenting it. The chicken manure and sawdust can be mixed in a weight ratio of 70-90:10-30. Mixing the chicken manure with sawdust adjusts its moisture content and reduces odor, making it easier to process and suitable as organic fertilizer. This processed chicken manure can be combined with castor oil meal, rapeseed oil meal, and palm oil meal, which are used as plant materials, to improve the performance of the organic fertilizer, thereby increasing crop productivity.

[0039] For example, the content of the processed chicken manure may be 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, or 20 parts by weight, but is not limited to these.

[0040] The rice bran mentioned above is a byproduct of milling brown rice into white rice. Due to its high phosphoric acid content, it can be used as animal feed, compost, or environmental protection material. The rice bran contains oil components, which act as a lubricant to ensure uniform mixing of the various raw materials in the organic fertilizer. This uniform mixing enhances the binding force between the raw materials. For example, the rice bran content can be 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, or 15 parts by weight, but is not limited to these. If the rice bran content exceeds the above range, its lubricant effect will be insufficient, or the fertilizer may be difficult to solidify.

[0041] In addition, the aforementioned microbial organic compound fertilizer includes a coating formed on at least a portion of the surface of the aforementioned organic fertilizer, the coating being formed by spraying, drying and cooling the microbial culture solution.

[0042] The above coating can be formed by rotating organic fertilizer in the presence of microbial powder or by immersing organic fertilizer in microbial culture solution. If spraying, drying and cooling methods are used, the characteristics of organic fertilizer and microbial fertilizer can be expressed at the same time, and the mechanical strength can be improved, thereby improving storage stability.

[0043] Organic fertilizers made primarily from organic matter such as oilseed meal, processed chicken manure, and rice bran have undergone a fermentation process. Alternatively, while these components may not require artificial decomposition, they can supply nutrients to the soil through fermentation with soil microorganisms after application. However, their fertilization effect is slower than that of livestock manure compost, and the soil-modifying effect of organic fertilizers can be significantly reduced when soil degradation leads to insufficient microbial supply.

[0044] The coating is formed on at least a portion of the surface of the organic fertilizer, but the penetration into the center of the organic fertilizer is minimal or nonexistent. Microorganisms contained in the coating are applied in a liquid phase, thereby allowing a predetermined amount to be absorbed by the surface portion from the center (0%) to over 75% of the organic fertilizer upon application. This strengthens the bonding force between the materials of the organic fertilizer, thereby improving the mechanical properties of the microbial organic compound fertilizer. Furthermore, the rice bran in the organic fertilizer enhances the bonding force with the coating. Conversely, if the microbial culture solution penetrates into the center portion (below 75%) of the organic fertilizer, the microbial organic compound fertilizer may be damaged during the drying and cooling processes. Unlike conventional chemical fertilizers, organic fertilizers have relatively insufficient bonding force; however, by forming the coating only on the surface portion, mechanical strength and storage stability can be improved.

[0045] The aforementioned microbial culture medium can be selected from one of the following groups: Bacillus subtilis culture medium, Saccharomyces cerevisiae culture medium, Pseudomonas aeruginosa culture medium, Aspergillus schavar-formis culture medium, Rhodotorula glutinis culture medium, Bacillus megaterium culture medium, Streptomyces coastalis culture medium, Ascomycetes thermophilus culture medium, and combinations thereof. The aforementioned microbial culture medium can be diluted 300-500 times in purified water at a concentration of 1×10⁻⁶. 6～7 It is made from microbial powder of cfu / g, but is not limited to this.

[0046] In addition, the thickness of the above coating can be from 10μm to 50μm, for example, it can be 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, 31μm, 32μm, 33μm, 34μm, 35μm, 36μm, 37μm, 38μm, 39μm, 40μm, 41μm, 42μm, 43μm, 44μm, 45μm, 46μm, 47μm, 48μm, 49μm or 50μm, but is not limited to this. If the thickness of the coating is less than 10 μm, the quality of the organic fertilizer will be reduced, or the mechanical strength improvement effect will be insufficient. If the thickness of the coating is greater than 50 μm, too much coating will be formed, thereby reducing the fertilizer efficiency of the organic fertilizer, or the culture solution will penetrate into the interior excessively, thereby reducing the mechanical properties.

[0047] Furthermore, the average particle size of the aforementioned organic fertilizer can be 1mm to 10mm, for example, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, but is not limited to these. If the average particle size of the aforementioned organic fertilizer is less than 1mm, the risk of loss of the organic fertilizer may increase; if the average particle size of the aforementioned organic fertilizer is greater than 10mm, the mechanical properties of the aforementioned organic fertilizer may be reduced.

[0048] Furthermore, the aforementioned organic fertilizer can be in granular or pellet form. Specifically, the organic fertilizer is prepared as granular or pellet-shaped solid particles, thereby minimizing dust generation during fertilizer handling and allowing for even spraying during application, thus improving ease of use.

[0049] Preparation method of microbial organic compound fertilizer

[0050] Figure 1 This diagram illustrates a method for preparing an organic fertilizer according to an embodiment.

[0051] Reference Figure 1 A method for preparing a microbial organic compound fertilizer is provided, comprising: step (a) mixing and pulverizing 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran; step (b) molding the mixture of step (a) into granules or pellets to prepare organic fertilizer; step (c) spraying microbial culture solution onto the organic fertilizer to form a coating; and step (d) cooling and drying the product of step (c).

[0052] First, in step (a), 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran are mixed and pulverized to prepare a mixture. Alternatively, the mixture may also include at least one selected from the group consisting of 5 to 30 parts by weight of rapeseed oil meal, 1 to 5 parts by weight of palm oil meal, and 5 to 20 parts by weight of processed chicken manure, which are then mixed and pulverized to prepare the mixture. The physical properties, content, and specific effects of the above-mentioned raw materials are as described above.

[0053] The mixture from step (a) above can be shaped into granules or pellets in step (b) to prepare organic fertilizer. Specifically, the mixture from step (a) above can be added to a molding machine to solidify into granules or pellets. Step (b) above can be performed at a molding temperature of 300°C to 500°C, for example, 300°C, 325°C, 350°C, 375°C, 400°C, 425°C, 450°C, 475°C, 500°C, or a value between two of these. If the molding temperature is less than 300°C, the moldability of the organic fertilizer may be reduced; if the molding temperature is greater than 500°C, the molding temperature is too high and the organic fertilizer may be damaged.

[0054] In step (c) above, a microbial culture solution can be sprayed onto the organic fertilizer to form a coating. Specifically, step (c) includes: adding the organic fertilizer formed in step (b) into the interior of a roller coating machine; and spraying a microbial culture solution into the interior of the coating machine while rotating the machine to apply the organic fertilizer, thereby uniformly forming a coating on the surface of the organic fertilizer. The coating includes the microbial culture solution, a portion of which is absorbed by the organic fertilizer, thereby firmly increasing the binding force of the organic fertilizer and improving its mechanical properties. Furthermore, the direct application of the microbial culture solution to the organic fertilizer increases its fertilization rate, thereby improving crop productivity. The coating is formed by rotary spraying, preventing excessive penetration of the culture solution and improving mechanical properties and storage stability.

[0055] The aforementioned roller coating machine allows adjustment of the roller's rotation speed and the amount of nutrient solution sprayed, based on the characteristics of the organic fertilizer and the desired coating thickness. For example, the roller's rotation speed can be 5 rpm to 25 rpm, and the amount of nutrient solution sprayed relative to 100 parts by volume of organic fertilizer can be 0.1 parts by volume to 20 parts by volume. Increasing the roller's rotation speed or decreasing the amount of nutrient solution sprayed reduces the coating thickness, while decreasing the roller's rotation speed or increasing the amount of nutrient solution sprayed increases the coating thickness.

[0056] In step (d) above, the product of step (c) can be cooled and dried. The cooling and drying in step (d) can be performed at a temperature of 0°C to 10°C. If the cooling and drying temperature meets the above range, problems such as excessive cooling and drying that reduce mechanical properties or reduce the adhesion between organic fertilizer and coating can be prevented.

[0057] In addition, the thickness of the above coating can be from 10μm to 50μm, for example, it can be 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm, 30μm, 31μm, 32μm, 33μm, 34μm, 35μm, 36μm, 37μm, 38μm, 39μm, 40μm, 41μm, 42μm, 43μm, 44μm, 45μm, 46μm, 47μm, 48μm, 49μm or 50μm, but is not limited to this. If the thickness of the coating is less than 10 μm, the quality and mechanical properties of the organic fertilizer will be reduced. If the thickness of the coating is greater than 50 μm, too much coating will be formed, which will reduce the fertilizer efficiency of the organic fertilizer.

[0058] Furthermore, the average particle size of the aforementioned organic fertilizer can be 1mm to 10mm, for example, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, but is not limited to these. If the average particle size of the aforementioned organic fertilizer is less than 1mm, the risk of loss of the organic fertilizer may increase; if the average particle size of the aforementioned organic fertilizer is greater than 10mm, the mechanical properties of the aforementioned organic fertilizer may be reduced.

[0059] The embodiments of this specification are described in more detail below. However, the experimental results described below are only representative of the above embodiments and cannot be used to narrow down or limit the scope and content of this specification. The effects of several examples not explicitly mentioned in this specification will be specifically described in the corresponding sections.

[0060] Example 1

[0061] Add 80 parts by weight of castor bean meal, 10 parts by weight of rapeseed oil meal, 5 parts by weight of palm oil meal and 5 parts by weight of rice bran to a grinder, and mix and grind to prepare a mixture.

[0062] The prepared mixture was added to a granulation machine and extruded at 400°C to form granules of organic fertilizer. The formed organic fertilizer was then added to a roller coating machine, where Bacillus megaterium culture solution was sprayed onto the surface of the organic fertilizer while it was rotating, thereby coating it with a thickness of 30 μm. After cooling and drying at 5°C for 2 hours in a cooler, a microbial organic compound fertilizer with an average particle size of 5 mm was prepared.

[0063] Example 2

[0064] Add 70 parts by weight of castor bean meal, 20 parts by weight of processed chicken manure (mixed with chicken manure and sawdust in a weight ratio of 80:20), and 10 parts by weight of rice bran to a pulverizer, and then mix and pulverize to prepare a mixture.

[0065] The prepared mixture was added to a granulation machine and extruded at 400°C to form granular organic fertilizer. The formed organic fertilizer was then added to a roller coating machine, where Bacillus megaterium culture solution was sprayed while the machine was rotating, thereby coating the surface of the organic fertilizer with a thickness of 30 μm. After cooling and drying at 5°C for 2 hours in a cooler, a microbial organic compound fertilizer with an average particle size of 5 mm was prepared.

[0066] Example 3

[0067] Add 60 parts by weight of castor bean meal, 30 parts by weight of rapeseed oil meal and 10 parts by weight of rice bran to a grinder, and mix and grind them to prepare a mixture.

[0068] The prepared mixture was added to a granulation machine and extruded at 400°C to form granular organic fertilizer. The formed organic fertilizer was then added to a roller coating machine, where Bacillus subtilis culture solution was sprayed while the machine was rotating, thereby coating the surface of the organic fertilizer with a thickness of 30 μm. After cooling and drying at 5°C for 2 hours in a cooler, a microbial organic compound fertilizer with an average particle size of 5 mm was prepared.

[0069] Example 4

[0070] The microbial organic compound fertilizer was prepared using the same method as in Example 1, except that the roller rotation speed was increased and the amount of culture solution sprayed was reduced, and the coating was applied in a manner that resulted in a coating thickness of 15 μm.

[0071] Example 5

[0072] The amount of culture medium sprayed was increased, and the coating was applied in a manner that resulted in a coating thickness of 45 μm. Otherwise, a microbial organic compound fertilizer was prepared using the same method as in Example 1.

[0073] Comparative Example 1

[0074] Comparative Example 1 is an organic fertilizer prepared primarily from livestock excrement.

[0075] Comparative Example 2

[0076] No coating containing microbial culture solution was formed; otherwise, the organic fertilizer was prepared using the same method as in Example 1.

[0077] Comparative Example 3

[0078] A coating was formed by combining organic fertilizer shaped by rotary mixing with microbial powder. Otherwise, a microbial organic compound fertilizer was prepared using the same method as in Example 1. The microbial powder was not evenly coated onto the organic fertilizer, making it difficult to measure the coating thickness.

[0079] Comparative Example 4

[0080] The formed organic fertilizer was immersed in a microbial culture solution for 30 seconds, then cooled and dried to form a coating. Otherwise, the microbial organic compound fertilizer was prepared using the same method as in Example 1. The coating thickness was approximately 80 μm. When the microbial culture solution penetrated into the formed organic fertilizer and was cooled and dried, the proportion of damaged microbial organic compound fertilizer was greater than 30%, resulting in poor yield.

[0081] Comparative Example 5

[0082] The organic fertilizer was prepared using the same method as in Example 1, except that the drum rotation speed was increased, the amount of microbial culture solution sprayed was reduced, and the coating thickness was adjusted to 5 μm.

[0083] Comparative Example 6

[0084] The amount of microbial culture solution sprayed was increased, and the coating thickness was adjusted to 75 μm. Otherwise, the organic fertilizer was prepared using the same method as in Example 1. When the microbial culture solution penetrated into the formed organic fertilizer and was cooled and dried, a portion of the microbial organic compound fertilizer was damaged. The damaged microbial organic compound fertilizer lost approximately 15% of its diameter, suggesting that the amount of such damage would increase with excessive penetration of the microbial culture solution.

[0085] Experimental Example 1: Composition Evaluation of Organic Fertilizer

[0086] To evaluate the composition of the organic fertilizers prepared in the examples and comparative examples, the pH, OM (organic components), TN (total nitrogen), P2O5 (phosphorus), K2O (potassium), CaO (calcium), MgO (magnesium), Na2O (sodium) and moisture content of each organic fertilizer were measured, and the results are shown in Table 1.

[0087] Table 1

[0088]

[0089] Referring to Table 1 above, it can be confirmed that, apart from Comparative Example 1, which was previously used as livestock manure compost, the organic fertilizers showed slight differences, but the organic content was above 75%. In particular, the organic fertilizers of Examples 1 and 2 showed the highest values ​​for the most effective components: nitrogen (N), phosphorus (P), and potassium (K). Therefore, it can be expected that when fertilized, the soil quality can be improved and the crop productivity increased. Conversely, it can be confirmed that the NPK content of the organic fertilizers without coating (Comparative Example 2) or in cases where the organic fertilizer is impregnated in a culture solution to form a coating (Comparative Example 4) is reduced.

[0090] Experimental Example 2: Evaluation of the Mechanical Properties of Organic Fertilizers

[0091] To confirm the mechanical properties of the organic fertilizers prepared in the examples and comparative examples, impact strength and tensile strength were measured, and the results are shown in Table 2.

[0092] - Impact strength (1 / 8”, kg·cm / cm): Measured according to ASTM D256 method. (Notched-IzodImpact)

[0093] - Tensile strength (kg·cm / cm): Measured according to ASTM D638 method.

[0094] Table 2

[0095] category Impact strength Tensile strength Example 1 10.4 251 Example 2 10.2 247 Example 3 10.3 253 Example 4 9.8 237 Example 5 10.1 238 Comparative Example 1 5.1 154 Comparative Example 2 7.4 174 Comparative Example 3 7.2 162 Comparative Example 4 6.3 137 Comparative Example 5 7.5 177 Comparative Example 6 6.8 141

[0096] Referring to Table 2, the impact strength and tensile strength of the microbial organic compound fertilizer of the reference embodiment confirm its excellent mechanical properties. Therefore, when applying the microbial organic compound fertilizer of the reference embodiment, it can be sprayed without loss or runoff. Thus, compared with the use of the above-mentioned organic fertilizer, the fertilizer effect is excellent, thereby predictably improving crop productivity.

[0097] Conversely, in the case of conventional livestock compost (Comparative Example 1), it was confirmed that the high moisture content significantly reduced impact and tensile strength. When no coating was applied (Comparative Example 2) or when a coating was formed using microbial powder (Comparative Example 3), both impact and tensile strengths showed low values. In the case of coating formation by impregnation with a microbial culture solution (Comparative Example 4), the culture solution excessively penetrated into the interior of the microbial organic compound fertilizer, thereby reducing impact and tensile strength. Furthermore, even when coating was performed by spraying the culture solution, if the coating thickness was too thin (Comparative Example 5), the binding force of the organic fertilizer was reduced, resulting in minimal strength improvement. If the coating thickness was too thick (Comparative Example 6), it was confirmed that excessive penetration of the culture solution into the interior reduced mechanical strength.

[0098] The foregoing description in this specification is for illustrative purposes only. It will be understood by those skilled in the art that other specific embodiments can be readily derived without altering the technical concepts or essential features described herein. Therefore, the embodiments described above are merely illustrative in all respects and should not be construed as limiting. For example, components described as a single element can also be implemented separately; similarly, components described separately can also be implemented in combination.

[0099] The scope of this specification is indicated by the claims, and the meaning and scope of the claims, as well as all changes or modifications derived from their equivalents, shall be interpreted as being included within the scope of this specification.

Claims

1. A microbial organic compound fertilizer, comprising 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran, characterized in that, The organic fertilizer is in granular form and includes a coating formed on at least a portion of the surface of the organic fertilizer. The coating is formed by spraying a microbial culture solution inside a roller coating machine while the machine is rotating, and then drying and cooling the product at a temperature of 0°C to 10°C. The thickness of the coating is 10μm to 50μm.

2. The microbial organic compound fertilizer according to claim 1, characterized in that, The aforementioned organic fertilizer also includes at least one selected from the group consisting of 5 to 30 parts by weight of rapeseed oil meal, 1 to 5 parts by weight of palm oil meal, and 5 to 20 parts by weight of processed chicken manure.

3. The microbial organic compound fertilizer according to claim 1, characterized in that, The aforementioned microbial culture medium is selected from one of the following groups: Bacillus subtilis culture medium, Saccharomyces cerevisiae culture medium, Pseudomonas, Aspergillus schavarrei culture medium, Rhodotorula rubra culture medium, Bacillus megaterium culture medium, Streptomyces coastalis culture medium, Ascomycetes thermophilus culture medium, and combinations of two or more of them.

4. The microbial organic compound fertilizer according to claim 1, characterized in that, The average particle size of the above-mentioned organic fertilizers is 1mm to 10mm.

5. A method for preparing a microbial organic compound fertilizer, characterized in that, include: Step (a): Mix and crush 60 to 80 parts by weight of castor bean meal and 1 to 15 parts by weight of rice bran. Step (b) involves shaping the mixture from step (a) into granules to prepare organic fertilizer. Step (c): The organic fertilizer is sprayed with microbial culture solution inside a roller coating machine containing the organic fertilizer while the coating machine is rotating to form a coating with a thickness of 10 μm to 50 μm. as well as Step (d): Cool and dry the product of step (c) at a temperature of 0°C to 10°C.

6. The method for preparing microbial organic compound fertilizer according to claim 5, characterized in that, In step (a) above, the process further includes mixing and crushing at least one of the following groups: 5 to 30 parts by weight of rapeseed oil meal, 1 to 5 parts by weight of palm oil meal, and 5 to 20 parts by weight of processed chicken manure.

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