Preparation method of bacterium-containing compound fertilizer and method for increasing viable count in fertilizer

Abstract

The invention provides a method for preparing a bacterium-containing compound fertilizer and a method for increasing the viable count in the fertilizer. The method for preparing the bacterium-containing compound fertilizer comprises the following steps: spraying the surfaces of fertilizer particles with a liquid fungicide; performing first mixing treatment on the spraying treatment product and a first powder fungicide to obtain the bacterium-containing compound fertilizer; wherein the liquid fungicide comprises a second powder fungicide, biochemical potassium fulvate and water. Therefore, the method is simple in process and high in operability, and the addition amount of bacteria in the prepared bacteria-containing compound fertilizer and the retention rate of viable bacteria can be effectively increased by adopting the method.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, and in particular to a method for preparing a bacteria-containing compound fertilizer and a method for increasing the number of live bacteria in the fertilizer. Background Art

[0002] It is difficult to add bacteria to fertilizers, and low bacteria retention rate is a common problem in the fertilizer production process, which has a great impact on the quality of fertilizer products. Adding bacteria to fertilizers is a relatively complicated issue. For example, if bacteria are only added to the coating drum, it is difficult to increase the amount of bacteria added.

[0003] At present, the usual method is to use highly active bacterial agents and anti-oil adding bacteria in the coating drum, but the amount added is also limited. If the amount added is too large, the anti-oil bonding effect will be poor, the fertilizer will lose powder, and some bacterial powder will fall off during stacking and transportation.

[0004] How to prepare fertilizers with higher bacterial content and improve the retention rate of live bacteria are issues that need to be addressed urgently. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art to a certain extent. To this end, the present invention proposes a method for preparing a bacterial compound fertilizer, which can effectively increase the amount of bacteria added and the retention rate of live bacteria through a two-stage bacterial addition production process.

[0006] In the first aspect of the present invention, the present invention proposes a method for preparing a bacteria-containing compound fertilizer. According to an embodiment of the present invention, the method comprises: spraying the surface of fertilizer particles with a liquid bacterial agent; performing a first mixing treatment on the spraying treatment product and a first powdered bacterial agent to obtain the bacteria-containing compound fertilizer; wherein the liquid bacterial agent comprises: a second powdered bacterial agent, biochemical potassium humate, and water. Therefore, the method has a simple process and strong operability, and the method can effectively increase the amount of bacteria added and the retention rate of live bacteria in the prepared bacteria-containing compound fertilizer.

[0007] According to an embodiment of the present invention, the method may further include at least one of the following additional technical features:

[0008] According to an embodiment of the present invention, the liquid bacterial agent includes: 30-35 parts by mass of the second powdered bacterial agent; 20-25 parts by mass of the biochemical potassium humate; and 40-50 parts by mass of the water.

[0009] According to an embodiment of the present invention, the mass ratio of the liquid bacterial agent to the fertilizer granules is (1:2):1000.

[0010] According to an embodiment of the present invention, the mass ratio of the first powdered bacterial agent to the fertilizer particles is (1-2):1000.

[0011] According to an embodiment of the present invention, the spraying treatment product, the first powdery bacterial agent and the anti-powdering agent are subjected to the first mixing treatment.

[0012] According to an embodiment of the present invention, before the first mixing treatment of the spraying treatment product with the first powdered microbial agent, the method further includes: performing a second mixing treatment of the spraying treatment product with an anti-oiling agent.

[0013] According to an embodiment of the present invention, the mass ratio of the anti-caking oil, the first powdery bacterial agent and the anti-caking powder is (2-2.5):(1-1.5):(3-3.5).

[0014] According to an embodiment of the present invention, the temperature of the spraying treatment is 60°C-65°C.

[0015] According to an embodiment of the present invention, the temperature of the first mixing treatment is 30°C-40°C.

[0016] According to an embodiment of the present invention, the temperature of the second mixing treatment is 30°C-40°C.

[0017] According to an embodiment of the present invention, the fertilizer is selected from at least one of inorganic fertilizer and organic fertilizer.

[0018] According to an embodiment of the present invention, the number of live bacteria in the bacterial agent is 170 billion / g-190 billion / g.

[0019] In the second aspect of the present invention, the present invention provides a bacteria-containing compound fertilizer. According to an embodiment of the present invention, the bacteria-containing fertilizer is prepared by the method described in the first aspect. As mentioned above, the method of the present invention can effectively increase the amount of bacteria added and the retention rate of live bacteria in the bacteria-containing compound fertilizer. Therefore, the bacteria-containing compound fertilizer of the present invention has a high bacteria content, can enhance the biological activity and effect of the fertilizer, and at the same time prolong the shelf life of the fertilizer.

[0020] In a third aspect of the present invention, the present invention proposes a method for increasing the number of live bacteria in a fertilizer. According to an embodiment of the present invention, the method comprises: performing a bacterial treatment on the fertilizer using the method described in the first aspect. As mentioned above, the method of the present invention can effectively increase the amount of bacteria added and the retention rate of live bacteria in the bacteria-containing compound fertilizer, thereby increasing the number of live bacteria in the fertilizer.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 The process of preparing bacterial compound fertilizer according to the embodiment of the present invention is Figure 1 ;

[0024] Figure 2 The process of preparing bacterial compound fertilizer according to the embodiment of the present invention is Figure 2 . DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0026] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Further, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0027] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0028] In this document, the terms “include” or “comprising” are open expressions, that is, including the contents specified in the present invention but not excluding other contents.

[0029] As used herein, the terms "optionally", "optional" or "optionally" generally mean that the subsequently described event or circumstance may but need not occur, and that the description includes instances where the event or circumstance occurs and instances where it does not.

[0030] At present, the method of adding bacteria to fertilizers is to use anti-caking oil to add bacteria to the fertilizers in a coating drum so that the bacteria adhere to the surface of the fertilizer. However, the inventors found in experiments that if too much bacteria is added without changing the anti-caking oil, the anti-caking oil cannot effectively adhere and the excess bacteria will fall off, that is, the amount of bacteria added will be limited by the amount of anti-caking oil added. Therefore, the inventors have developed a new method for preparing bacteria-containing compound fertilizers. The method adopts a two-stage bacteria addition process to increase the amount of bacteria added and the retention rate of live bacteria, providing a simple method for producing fertilizers with high live bacteria. The method for preparing bacteria-containing compound fertilizers, bacteria-containing compound fertilizers, and methods for increasing the number of live bacteria in fertilizers will be introduced in detail below.

[0031] Method for preparing bacteria-containing compound fertilizer

[0032] The present invention provides a method for preparing a bacterial compound fertilizer. Figure 1 , the method comprising:

[0033] S100: Spray treatment

[0034] In this process, the surface of the fertilizer particles is sprayed with a liquid bacterial agent so that the liquid bacterial agent forms a coating layer on the surface of the fertilizer particles.

[0035] In some embodiments of the present invention, the liquid bacterial agent includes: a second powdered bacterial agent, biochemical potassium humate, and water. After a large number of experiments, the inventors found that the killing and destructive effects of fertilizers on bacteria are relatively obvious, and this phenomenon is the main reason for the low retention rate of bacteria added to fertilizers and the short shelf life. For this reason, the inventors added biochemical potassium humate to the liquid bacterial agent. This substance can not only act as a binder to enhance the combination between the bacterial agent and the fertilizer, but also form a protective isolation layer on the surface of the fertilizer when it is sprayed on the surface of the fertilizer, which can effectively isolate the bacteria from the surface of the fertilizer particles, reduce the destructive effect of inorganic salts on the bacteria, and greatly improve the retention rate of the bacteria.

[0036] In some embodiments of the present invention, the liquid bacterial agent includes: 30-35 parts by weight of the second powdered bacterial agent; 20-25 parts by weight of the biochemical potassium humate; and 40-50 parts by weight of the water. Thus, the liquid bacterial agent not only has good fluidity and is easy to spray with a pump, but also can form a protective isolation layer on the surface of the fertilizer, reduce the damage of inorganic salts to bacteria, and improve the retention rate of bacteria.

[0037] Exemplarily, the mass fraction of the second powdered bacterial agent is 30, 31, 32, 33, 34, 35, etc., or can be a range consisting of any of the above values.

[0038] Illustratively, the mass fraction of the biochemical potassium humate is 20, 21, 22, 23, 24, 25, etc., or can be a range consisting of any of the above numerical values.

[0039] Illustratively, the mass fraction of water is 40, 42, 45, 47, 50, etc., or can be a range consisting of any of the above values.

[0040] In some embodiments of the present invention, the mass ratio of the liquid bacterial agent to the fertilizer granules is (1-2):1000. For example, it can be 1:1000, 1.2:1000, 1.5:1000, 1.7:1000, 2:1000, etc., or can be a range composed of any of the above values. Therefore, by making the mass ratio of the liquid bacterial agent to the fertilizer granules within the above range, the liquid bacterial agent can be evenly sprayed on the surface of the fertilizer granules, so that an isolation layer is formed on the surface of the fertilizer granules, reducing the damage of inorganic salts to the bacteria, and improving the retention rate of the bacteria.

[0041] In some embodiments of the present invention, the temperature of the spraying treatment is 60°C-65°C. For example, it can be 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, etc., or can be a range of any of the above values. Therefore, by making the temperature of the spraying treatment within the above range, the water in the liquid bacterial agent can be evaporated, and the bacterial agent can be fixed on the surface of the fertilizer under the action of biochemical potassium humate.

[0042] In some embodiments of the present invention, the present invention does not specifically limit the type of fertilizer particles. The method described in the present invention is applicable to any fertilizer that can be prepared as a bacterial compound fertilizer. Those skilled in the art can make a selection according to specific needs. For example, the fertilizer particles can be selected from but not limited to at least one of inorganic fertilizer particles and organic fertilizer particles.

[0043] It should be noted that the liquid bacterial agent and the powdered bacterial agent described in the present invention represent different forms of the same bacterial agent. In some embodiments of the present invention, the present invention does not specifically limit the type of bacterial agent. It can be understood by those skilled in the art that the method of the present invention can be used for fungi suitable for fertilizers. Exemplarily, the bacterial agent can be, but is not limited to, Bacillus subtilis, or a bacterial agent formed by combining at least one of the following bacterial species with Bacillus subtilis: Bacillus licheniformis, Bacillus amyloliquefaciens, Bacillus megaterium, Streptomyces jingyangensis, mycorrhizal fungi, round brown nitrogen-fixing bacteria, actinomycetes, photosynthetic bacteria, lactic acid bacteria, yeast, Aspergillus oryzae, Aspergillus niger, Trichoderma viride, etc.

[0044] In some embodiments of the present invention, the number of viable bacteria in the bacterial agent is 170 billion / g to 190 billion / g, for example, 170 billion / g, 175 billion / g, 180 billion / g, 185 billion / g, 190 billion / g, etc.

[0045] S200: First mixing process

[0046] In this process, the spraying product obtained by the spraying treatment is subjected to a first mixing treatment with the first powdered bacterial agent to obtain the bacterial compound fertilizer. Thus, by adopting the two-step method of adding bacteria of the present invention, the amount of bacteria added can be increased without causing the bacteria to fall off, and the retention rate of live bacteria can be effectively improved.

[0047] In some embodiments of the present invention, the mass ratio of the first powdered bacterial agent to the fertilizer granules is (1-2):1000. For example, it can be 1:1000, 1.2:1000, 1.5:1000, 1.7:1000, 2:1000, or a range of any of the above values. Thus, by making the mass ratio of the first powdered bacterial agent to the fertilizer granules within the above range, the powdered bacterial agent can be evenly coated on the surface of the fertilizer granules, increasing the amount of bacteria added and avoiding the shedding of bacteria.

[0048] In some embodiments of the present invention, reference Figure 2 , before the spraying treatment product and the first powdered bacterial agent are subjected to a first mixing treatment, the method further comprises:

[0049] S300: Second Mixing Process

[0050] In this process, the spraying product obtained after the spraying treatment is subjected to a second mixing treatment with the anti-caking oil. Thus, the anti-caking oil can not only enhance the adhesion between the powdered microbial agent and the fertilizer particles, ensure the uniform distribution and firm adhesion of the microbial agent on the fertilizer surface, but also prevent the fertilizer from agglomerating during storage and transportation.

[0051] In some embodiments of the present invention, the spraying product, the first powdered bacterial agent and the anti-caking powder are subjected to the first mixing treatment, wherein the anti-caking powder can produce a synergistic effect with the anti-caking oil to prevent the fertilizer from agglomerating during storage and transportation.

[0052] In some embodiments of the present invention, the mass ratio of the anti-caking oil, the first powdered microbial agent and the anti-caking powder is (2-2.5): (1-1.5): (3-3.5). For example, it can be 2:1:3, 2.1:1.1:3.1, 2.2:1.2:3.2, 2.3:1.3:3.3, 2.4:1.4:3.4, 2.5:1.5:3.5, 2.5:1.2:3.5, etc., or it can be a range of any of the above values. In this way, it can not only ensure that the anti-caking oil and the powdered microbial agent form a good bond, enhance the adhesion of the microbial agent on the surface of the fertilizer particles, ensure the effectiveness of the microbial agent, but also prevent the fertilizer from agglomerating during storage and transportation.

[0053] In some embodiments of the present invention, the temperature of the first mixing treatment is 30° C.-40° C. For example, it can be 30° C., 32° C., 35° C., 37° C., 40° C., etc., or can be a range consisting of any of the above values.

[0054] In some embodiments of the present invention, the temperature of the second mixing treatment is 30° C.-40° C. For example, it can be 30° C., 32° C., 35° C., 37° C., 40° C., etc., or can be a range consisting of any of the above values.

[0055] It should be noted that the anti-caking oil in the present invention refers to an oily anti-caking agent, and the anti-caking powder refers to a powdery anti-caking agent. The anti-caking oil and anti-caking powder used in the present invention are both conventional products that can be purchased commercially.

[0056] Bacteria-containing compound fertilizer

[0057] The present invention provides a bacteria-containing compound fertilizer. According to an embodiment of the present invention, the bacteria-containing compound fertilizer is prepared by the aforementioned method for preparing bacteria-containing compound fertilizer. As mentioned above, the method of the present invention can effectively increase the amount of bacteria added and the retention rate of live bacteria in the bacteria-containing compound fertilizer. Therefore, the bacteria-containing compound fertilizer of the present invention has a high bacteria content, can enhance the biological activity and effect of the fertilizer, and at the same time prolong the shelf life of the fertilizer.

[0058] Methods for increasing the number of live bacteria in fertilizers

[0059] The present invention proposes a method for increasing the number of live bacteria in a fertilizer. According to an embodiment of the present invention, the method comprises: performing a bacterial addition treatment on the fertilizer using the method described in the first aspect. As mentioned above, the method of the present invention can effectively increase the amount of bacteria added and the retention rate of live bacteria in the bacteria-containing compound fertilizer, thereby increasing the number of live bacteria in the fertilizer.

[0060] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. If no specific techniques or conditions are specified in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used that do not specify the manufacturer are all conventional products that can be obtained commercially.

[0061] Preparation method of liquid bacterial agent: add bacterial powder (Bacillus subtilis, viable bacteria count 180 billion / g), biochemical potassium humate and water into a beaker, stir evenly to obtain bacterial liquid, and detect the viable bacteria count in the liquid bacterial agent.

[0062] ① Bacterial solution 1: Add 30g bacterial powder (Bacillus subtilis, viable bacteria count 180 billion / g), 20g biochemical potassium humate, and 50g water into a beaker and stir well to obtain bacterial solution 1 with a viable bacteria count of 54 billion / g.

[0063] ② Bacterial liquid 2: Add 35g bacterial powder (Bacillus subtilis, viable bacteria count 180 billion / g), 25g biochemical potassium humate, and 40g water into a beaker and stir well to obtain bacterial liquid 2, with a viable bacteria count of 63 billion / g.

[0064] Example 1

[0065] (1) In a small drum in the laboratory, add 1000 g of 18-14-19 (a ratio of nitrogen, phosphorus and potassium nutrients) drum granulation fertilizer with particles of 2-4 mm, heat to 60°C, add 1 g of bacterial solution 1, and rotate the equipment until the liquid bacterial agent is evenly coated with the fertilizer particles.

[0066] (2) Cooling to 35°C, adding 2 g of anti-caking oil, rotating the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, adding 1 g of bacterial powder and 3 g of anti-caking powder, rotating the equipment until the bacterial agent is evenly coated by the fertilizer particles, and obtaining a bacterial compound fertilizer.

[0067] Example 2

[0068] (1) In a small drum in the laboratory, add 1000 g of 18-14-19 drum granulated fertilizer with particles of 2-4 mm, heat to 65 °C, add 2 g of bacterial solution 2, and rotate the equipment until the liquid bacterial agent is evenly coated with the fertilizer particles.

[0069] (2) Cooling to 40°C, adding 2.5 g of anti-caking oil, rotating the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, adding 1.5 g of bacterial powder and 3.5 g of anti-caking powder, rotating the equipment until the bacterial agent is evenly coated by the fertilizer particles, and obtaining a bacterial compound fertilizer.

[0070] Example 3

[0071] (1) In a small drum in the laboratory, add 1000 g of 18-14-19 drum granulated fertilizer with particles of 2-4 mm, heat to 60°C, add 1.2 g of bacterial solution 1, and rotate the equipment until the liquid bacterial agent is evenly coated with the fertilizer particles.

[0072] (2) Cooling to 37°C, adding 2 g of anti-caking oil, rotating the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, adding 1 g of bacterial powder and 3 g of anti-caking powder, rotating the equipment until the bacterial agent is evenly coated by the fertilizer particles, and obtaining a bacterial compound fertilizer.

[0073] Example 4

[0074] (1) In a small drum in the laboratory, add 1000 g of 18-14-19 drum granulated fertilizer with particles of 2-4 mm, heat to 62°C, add 1.0 g of bacterial solution 2, and rotate the equipment until the liquid bacterial agent is evenly coated with the fertilizer particles.

[0075] (2) Cooling to 35°C, adding 2.5 g of anti-caking oil, rotating the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, adding 1.5 g of bacterial powder and 3.5 g of anti-caking powder, rotating the equipment until the bacterial agent is evenly coated by the fertilizer particles, and obtaining a bacterial compound fertilizer.

[0076] Example 5

[0077] (1) In a small drum in the laboratory, add 1000 g of 18-14-19 drum granulated fertilizer with particles of 2-4 mm, heat to 65 °C, add 1.5 g of bacterial solution 1, and rotate the equipment until the liquid bacterial agent is evenly coated with the fertilizer particles.

[0078] (2) Cooling to 40°C, adding 2.0 g of anti-caking oil, rotating the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, adding 1 g of bacterial powder and 3 g of anti-caking powder, rotating the equipment until the bacterial agent is evenly coated by the fertilizer particles, and obtaining a bacterial compound fertilizer.

[0079] Example 6

[0080] (1) In a small drum in the laboratory, add 1000 g of 18-14-19 drum granulated fertilizer with particles of 2-4 mm, heat to 62°C, add 1.2 g of bacterial solution 2, and rotate the equipment until the liquid bacterial agent is evenly coated with the fertilizer particles.

[0081] (2) Cooling to 40°C, adding 2.5 g of anti-caking oil, rotating the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, adding 1.2 g of bacterial powder and 3.5 g of anti-caking powder, rotating the equipment until the bacterial agent is evenly coated by the fertilizer particles, and obtaining a bacterial compound fertilizer.

[0082] Comparative Example 1

[0083] (1) Add 1000 g of 18-14-19 drum granulated fertilizer with granules of 2-4 mm into a small drum in the laboratory, heat it to 35°C, and rotate the equipment to ensure uniform heating.

[0084] (2) Add 2 g of anti-caking oil, rotate the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, add 1 g of bacterial powder and 3 g of anti-caking powder, rotate the equipment until the bacterial agent is evenly coated by the fertilizer particles, and prepare a bacterial compound fertilizer.

[0085] Comparative Example 2

[0086] (1) Add 1000 g of 18-14-19 drum granulated fertilizer with a particle size of 2-4 mm into a small drum in the laboratory, heat it to 40°C, and rotate the equipment to ensure uniform heating.

[0087] (2) Add 2.5 g of anti-caking oil, rotate the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, add 1.5 g of bacterial powder and 3.5 g of anti-caking powder, rotate the equipment until the bacterial agent is evenly coated by the fertilizer particles, and prepare a bacterial compound fertilizer.

[0088] Comparative Example 3

[0089] (1) Add 1000 g of 18-14-19 drum granulated fertilizer with granules of 2-4 mm into a small drum in the laboratory, heat it to 35°C, and rotate the equipment to ensure uniform heating.

[0090] (2) Add 2 g of anti-caking oil, rotate the equipment until the anti-caking oil is evenly distributed on the surface of the fertilizer particles, add 1.2 g of bacterial powder and 3 g of anti-caking powder, rotate the equipment until the bacterial agent is evenly coated by the fertilizer particles, and prepare a bacterial compound fertilizer.

[0091] The number of live bacteria and the particle strength of the bacterial compound fertilizers prepared in Examples 1-6 and Comparative Examples 1-3 were tested. The experimental results are shown in Table 1. Compared with the one-stage addition of bacteria in the comparative example, the fertilizer using the two-stage addition of bacteria of the present invention has a significantly improved live bacteria retention rate, and the live bacteria retention rate has been improved by 19.4%. In addition, the particle strength of the fertilizer does not decrease when the two-stage addition of bacteria and the one-stage addition of bacteria are used.

[0092] Table 1

[0093]

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0095] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a bacterial compound fertilizer, characterized in that: include: The surface of the fertilizer particles is sprayed with liquid bacterial agent; The spraying product is mixed with the first powdered bacterial agent to obtain the bacterial compound fertilizer; Wherein, the liquid bacterial agent includes: a second powdered bacterial agent, biochemical potassium humate, and water.

2. The method according to claim 1, characterized in that: The liquid bacterial agent comprises: 30-35 parts by weight of the second powdered bacterial agent; 20-25 parts by mass of the biochemical potassium fulvic acid; 40-50 parts by mass of the water.

3. The method according to claim 2, characterized in that The mass ratio of the liquid bacterial agent to the fertilizer particles is (1-2): 1000; Optionally, the mass ratio of the first powdered bacterial agent to the fertilizer particles is (1-2):1000.

4. The method according to claim 1, characterized in that: The spraying treatment product, the first powdery bacterial agent and the anti-powdering agent are subjected to the first mixing treatment; Optionally, before the spraying treatment product is mixed with the first powdered microbial agent for the first time, the method further comprises: mixing the spraying treatment product with an anti-oiling agent for the second time.

5. The method according to claim 4, characterized in that The mass ratio of the anti-caking oil, the first powdery bacterial agent and the anti-caking powder is (2-2.5):(1-1.5):(3-3.5).

6. The method according to claim 4, characterized in that The temperature of the spraying treatment is 60°C-65°C; Optionally, the temperature of the first mixing treatment is 30°C-40°C; Optionally, the temperature of the second mixing treatment is 30°C-40°C.

7. The method according to any one of claims 1 to 6, characterized in that: The fertilizer is selected from at least one of inorganic fertilizer and organic fertilizer.

8. The method according to any one of claims 1 to 6, characterized in that: The number of live bacteria in the bacterial agent is 170 billion / g-190 billion / g.

9. A bacterial compound fertilizer, characterized in that: The method is used to prepare the product according to any one of claims 1 to 8.

10. A method for increasing the number of viable bacteria in a fertilizer, characterized in that: include: The fertilizer is treated with bacteria using the method described in any one of claims 1 to 8.

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