A high-nitrogen water-soluble fertilizer and its production method

Abstract

The present invention relates to a high-nitrogen water-soluble fertilizer and a production method thereof, characterized in that the high-nitrogen water-soluble fertilizer has a nitrogen content of greater than or equal to 15%, an amide nitrogen content of greater than or equal to 60%, and the amide nitrogen is provided by urea microparticles; the urea microparticles are obtained by crushing urea; the crushing is performed by setting the crusher to a mesh size of 40 to 100; and the urea hardness is greater than or equal to 50N. This application can improve the product quality of the water-soluble fertilizer.

Description

Technical Field

[0001] The invention relates to a high-nitrogen water-soluble fertilizer and a production method thereof. Background Art

[0002] Water-saving agriculture can improve the utilization rate of water and fertilizer, and save manpower and material resources, so it has been widely used. The requirements for the fertilizers used are also high, that is, they must be fully water-soluble and quick-dissolving. In order to ensure quick dissolution, water-soluble fertilizers are usually prepared into powder. Since the powder has a large specific surface area, the equipment requirements during production are very high, that is, the interior of the feeder is required to be smooth. However, even if the interior of the feeder is smooth, the production of water-soluble fertilizers is affected by the seasons, especially the production of high-nitrogen fertilizers. High-nitrogen water-soluble fertilizers can be produced smoothly in spring, autumn and winter, but in summer production, there is a problem that product quality is difficult to meet the standards. Therefore, many water-soluble fertilizer manufacturers increase production in winter or spring, reduce production in summer, and avoid summer production as much as possible.

[0003] However, there are many types of water-soluble fertilizer ratios and market demand also changes. Therefore, even if fertilizer is prepared in advance, it is impossible to fully meet market demand. What is more important is that there is a problem of capital backlog when preparing fertilizer in advance, which puts pressure on the operation of the enterprise. In addition, preparing fertilizer in advance is affected by the market. This market influence includes price changes of fertilizer raw materials and market demand. Any fluctuation may bring operating risks to the enterprise. For example, after the fertilizer is prepared, the market price of raw materials falls, which invisibly leads to an increase in the operating costs of the enterprise.

[0004] At present, there is no solution to the problem that high-nitrogen water-soluble fertilizers are difficult to meet quality standards in summer production. This quality standard includes both weight and nutrients. There is also no solution to the problem that the backlog of funds caused by preparing fertilizers in advance affects the capital operation of the enterprise and poses operational risks. Summary of the Invention

[0005] The present invention provides a high-nitrogen water-soluble fertilizer and a production method thereof, which solve the following technical problems: 1) the problem that the quality of high-nitrogen water-soluble fertilizer is difficult to meet the standards during summer production; and 2) the problem that the backlog of funds caused by preparing fertilizer in advance affects the capital operation of the enterprise and poses an operating risk.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A high-nitrogen water-soluble fertilizer, wherein the nitrogen content of the high-nitrogen water-soluble fertilizer is greater than or equal to 15%, the amide nitrogen content of the nitrogen content is greater than or equal to 60%, and the amide nitrogen is provided by urea microparticles;

[0008] The urea particles are obtained by crushing urea granules;

[0009] The crushing is to set the mesh size of the crusher to 40 to 100 meshes;

[0010] The hardness of the urea granules is greater than or equal to 50N.

[0011] The high-nitrogen water-soluble fertilizer also includes auxiliary materials, which are Fumei powder and polyacrylamide; the mass of the auxiliary materials accounts for 1-3% of the mass of urea; and the mass of the Fumei powder in the auxiliary materials is greater than the mass of the polyacrylamide.

[0012] The mass ratio of the Fumei powder to the polyacrylamide in the auxiliary materials is 2-4:1-2.

[0013] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles and water-soluble fertilizer raw materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain high-nitrogen water-soluble fertilizer.

[0014] The urea particles, water-soluble fertilizer raw materials and auxiliary materials are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer;

[0015] The water-soluble fertilizer raw material is one or more of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, ammonium sulfate, potassium pyrophosphate, potassium sulfate, potassium chloride and ammonium chloride;

[0016] The mass ratio of the urea particles, the water-soluble fertilizer raw material and the auxiliary material is 200-700:286-798:2-14.

[0017] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea granules and auxiliary materials into a crusher for crushing to obtain urea microparticles; adding the urea microparticles and water-soluble fertilizer raw materials into a container for mixing, and then measuring and packaging to obtain high-nitrogen water-soluble fertilizer;

[0018] The water-soluble fertilizer raw material is one or more of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, ammonium sulfate, potassium pyrophosphate, potassium sulfate, potassium chloride and ammonium chloride;

[0019] The mass ratio of the urea granules to the auxiliary materials is 98-99:1-2; the mass ratio of the urea microparticles to the water-soluble fertilizer raw materials is 202-714:286-798.

[0020] The invention has the following beneficial technical effects:

[0021] 1) The high-nitrogen water-soluble fertilizer prepared in this application can solve the problem that the quality of high-nitrogen water-soluble fertilizer is difficult to meet in summer production; the backlog of funds caused by preparing fertilizer in advance affects the capital operation of the enterprise and poses an operating risk.

[0022] 2) This application solves the problem that the quality of high-nitrogen water-soluble fertilizer production in summer is difficult to meet the standards by limiting the hardness of urea used in urea particles and setting the mesh size of the crusher to 40-100 mesh.

[0023] 3) This application further addresses the issue of high-nitrogen water-soluble fertilizers struggling to meet quality standards during summer production by adding auxiliary materials. The Fumei powder in the auxiliary materials improves the fluidity of the high-nitrogen fertilizer, while the polyacrylamide absorbs free water, preventing the water-soluble fertilizer from dissolving and adhering due to high temperatures. The combined effect of these two materials addresses this issue. This application further specifies that the mass of the Fumei powder is greater than that of the polyacrylamide, which can better address this issue of high-nitrogen water-soluble fertilizers struggling to meet quality standards during summer production.

[0024] 4) The present application obtains urea microparticles by adding urea granules and auxiliary materials into a crusher for crushing; during the crushing process, the auxiliary materials are attached to the surface of the urea microparticles, thereby solving the problem that the quality of high-nitrogen water-soluble fertilizer production is difficult to meet the standards in summer; it also solves the problem that the backlog of funds caused by the advance preparation of fertilizers by enterprises affects the capital operation of enterprises and poses operational risks. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution, the technical solution of the present invention is described in detail below with reference to preferred examples. Example 1

[0026] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, and 120 parts of ammonium sulfate; amidic nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.3, P2O5; 14.9, K2O: 10.0, and total nutrients 50.2.

[0027] The urea particles are obtained by crushing urea;

[0028] The crushing is to set the crusher to 80 meshes;

[0029] The urea is large-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 78.2N.

[0030] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade monoammonium phosphate, potassium sulfate and ammonium sulfate into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer. Example 2

[0031] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 120 parts of ammonium sulfate, and 5 parts of auxiliary materials; amidic nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0032] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0033] The urea particles are obtained by crushing urea;

[0034] The crushing is to set the crusher to 80 meshes;

[0035] The urea is large-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 78.2N.

[0036] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade monoammonium phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer. Example 3

[0037] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 100 parts of ammonium sulfate, and 5 parts of auxiliary materials; amidic nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0038] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0039] The urea particles are obtained by crushing urea;

[0040] The crushing is to set the crusher to 80 meshes;

[0041] The urea is large-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 78.2N.

[0042] Production method of high nitrogen water-soluble fertilizer:

[0043] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0044] Urea particles, industrial-grade monoammonium phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer. Example 4

[0045] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 20-20-20, specifically comprising 415 parts of urea microparticles, 385 parts of industrial-grade potassium dihydrogen phosphate, 140 parts of potassium sulfate, and 60 parts of ammonium sulfate; amidic nitrogen accounts for 94.1% of the total nitrogen content; theoretical values: N: 20.3, P2O5; 20.0, K2O: 20.1, and total nutrients 60.4.

[0046] The urea particles are obtained by crushing urea;

[0047] The crushing is to set the crusher to 60 mesh;

[0048] The urea is Fudao large-particle urea, and its average hardness is 72.3N.

[0049] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade potassium dihydrogen phosphate, potassium sulfate and ammonium sulfate into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer. Example 5

[0050] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 20-20-20, specifically comprising 415 parts of urea microparticles, 385 parts of industrial-grade potassium dihydrogen phosphate, 140 parts of potassium sulfate, 60 parts of ammonium sulfate, and 6 parts of auxiliary materials; amidic nitrogen accounts for 94.1% of the total nitrogen content; theoretical values: N: 20.2, P2O5; 19.9, K2O: 20.0, and total nutrients 60.1.

[0051] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 2:1;

[0052] The urea particles are obtained by crushing urea;

[0053] The crushing is to set the crusher to 60 mesh;

[0054] The urea is Fudao large-particle urea, and its average hardness is 72.3N.

[0055] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade potassium dihydrogen phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer. Example 6

[0056] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 20-20-20, specifically comprising 415 parts of urea microparticles, 385 parts of industrial-grade potassium dihydrogen phosphate, 140 parts of potassium sulfate, 60 parts of ammonium sulfate, and 6 parts of auxiliary materials; amidic nitrogen accounts for 94.1% of the total nitrogen content; theoretical values: N: 20.2, P2O5; 19.9, K2O: 20.0, and total nutrients 60.1.

[0057] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 2:1;

[0058] The urea particles are obtained by crushing urea;

[0059] The crushing is to set the crusher to 60 mesh;

[0060] The urea is Fudao large-particle urea, and its average hardness is 72.3N.

[0061] Production method of high nitrogen water-soluble fertilizer:

[0062] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0063] Urea particles, industrial-grade potassium dihydrogen phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer. Example 7

[0064] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 30-10-10, consisting of 600 parts of urea microparticles, 165 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, and 35 parts of ammonium sulfate; amidic nitrogen accounts for 91.1% of the total nitrogen content; theoretical values: N: 30.3, P2O5; 10.1, K2O: 10.0, and total nutrients 50.4.

[0065] The urea particles are obtained by crushing urea;

[0066] The crushing is to set the crusher to 40 meshes;

[0067] The urea is Friendship large-granular urea, and its average hardness is 68.7N.

[0068] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade ammonium dihydrogen phosphate, potassium sulfate and ammonium sulfate into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer. Example 8

[0069] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 30-10-10, comprising 600 parts of urea microparticles, 165 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 35 parts of ammonium sulfate, and 8 parts of auxiliary materials; amide nitrogen accounts for 91.1% of the total nitrogen content; theoretical values: N: 30.1, P2O5; 10.0, K2O: 9.9, and total nutrients 50.0.

[0070] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 5:3;

[0071] The urea particles are obtained by crushing urea;

[0072] The crushing is to set the crusher to 40 meshes;

[0073] The urea is Friendship large-granular urea, and its average hardness is 68.7N.

[0074] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade ammonium dihydrogen phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer. Example 9

[0075] A high-nitrogen water-soluble fertilizer with a nitrogen, phosphorus, and potassium ratio of 30-10-10, comprising 600 parts of urea microparticles, 165 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 35 parts of ammonium sulfate, and 8 parts of auxiliary materials; amide nitrogen accounts for 91.1% of the total nitrogen content; theoretical values: N: 30.1, P2O5; 10.0, K2O: 9.9, and total nutrients 50.0.

[0076] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 5:3;

[0077] The urea particles are obtained by crushing urea;

[0078] The crushing is to set the crusher to 40 meshes;

[0079] The urea is Friendship large-granular urea, and its average hardness is 68.7N.

[0080] Production method of high nitrogen water-soluble fertilizer:

[0081] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0082] Urea particles, industrial-grade ammonium dihydrogen phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer.

[0083] The hardness testing method in the above embodiment is to randomly select 30 grains, use a fertilizer hardness tester to test the hardness, and obtain the average hardness of the 30 grains.

[0084] The beneficial effects of the present invention are further illustrated below in conjunction with test data:

[0085] Test materials

[0086] 1.1 Experimental location: Shandong Aiguozhe Biotechnology Co., Ltd.

[0087] 1.2 Experimental testing: Test the weight (kg) and nutrients of the prepared products, including nitrogen (N) (%), phosphorus (P2O5) (%), potassium (K2O) (%) and total nutrients (%).

[0088] 1.3 Test objects: CK1 (except that small-particle urea was purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness was 9.8N, the other preparations were consistent with Example 1), CK2 (except that the mesh number of the crusher was 120 mesh, the other preparations were consistent with Example 1), CK3 (except that the mesh number of the crusher was 20 mesh, the other preparations were consistent with Example 1), CK4 (except that the auxiliary material was a composition of Fumei powder and polyacrylamide in a mass ratio of 2:3, the others were consistent with Example 2), Examples 1 to 3, CK5 (except that small-particle urea was purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness was 9.8N, the other preparations were consistent with Example 4), CK6 (except that the mesh number of the crusher was 120 mesh, the other preparations were consistent with Example 1 Example 4 is consistent), CK7 (except that the mesh number of the crusher is 20 mesh, the other preparations are consistent with Example 4), CK8 (except that the auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 1:2, the others are consistent with Example 5) and Examples 4 to 6; CK9 (except that small-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd. is used, and its average hardness is 9.8N. The other preparations are consistent with Example 7), CK10 (except that the mesh number of the crusher is 120 mesh, the other preparations are consistent with Example 7), CK11 (except that the mesh number of the crusher is 20 mesh, the other preparations are consistent with Example 7), CK12 (except that the auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:5, the others are consistent with Example 8) and Examples 7 to 9.

[0089] 1.4 Test method: Nutrients were added in accordance with NY / T 1107-2020 Macronutrient Water-Soluble Fertilizers. 50 bags were weighed, each weighing 5 kg, and the average value was taken.

[0090] Note: The production environment temperature is 28°C, the relative humidity is 67%, and the metering setting is 5.50kg;

[0091] The diameter of large-particle urea is 2 to 4.8 mm, and the diameter of small-particle urea is 0.8 to 2 mm.

[0092] The weight requirement is greater than or equal to 5-0.005kg; the absolute value of the negative deviation between the measured value of a single nutrient content and the marked value is ≤1.5%, and the absolute value of the negative deviation between the measured value of the total nutrient content and the marked value is not greater than 0.5%.

[0093] The sampling adopts the four-corner sampling method. For sampling with high nitrogen content, the angle of insertion of the sampler is slightly tilted upward. This is because the specific gravity of nitrogen is lower than that of phosphorus and potassium, so the sampling angle is slightly tilted upward.

[0094] 2 Results and Analysis

[0095] The average values of weight (kg), N (%), P2O5 (%), K2O (%) and total nutrients (%) of each treatment are shown in Table 1

[0096]

[0097] From the data comparison between CK1 and Example 1, CK5 and Example 4, and CK9 and Example 7 in Table 1, it can be seen that the different hardness of the selected urea directly affects the metering packaging and nutrient content of production. CK1, CK5, and CK9 are unqualified in terms of both weight and nitrogen content in nutrient content, and cannot meet the needs of summer production.

[0098] From the data comparison of CK2 and Example 1, CK6 and Example 4, CK10 and Example 7 in Table 1, it can be seen that the mesh size of the selected urea is 120 mesh, which affects the production measurement packaging and nutrient content. CK2, CK6, and CK10 are unqualified in terms of weight and nitrogen content in nutrient content, and cannot meet the needs of summer production.

[0099] From the data comparison of CK3 and Example 1, CK7 and Example 4, CK11 and Example 7 in Table 1, it can be seen that the mesh size of the selected urea is 20 mesh, which mainly affects the nutrient content. There is a high nitrogen nutrient content, and the phosphorus and potassium contents are lower than the designed content, that is, there is a large deviation between the theoretical value and the actual value. Although the weight meets the requirements, the large deviation between the theoretical value and the actual value brings difficulty to the formula calculation, and it is easy to have a single nutrient unqualified phenomenon. Therefore, it is difficult to meet the requirements of summer production.

[0100] It can be seen that the mesh size of the selected urea also affects the summer production of the product.

[0101] Comparing the data of CK4 and Example 1, CK8 and Example 4, and CK12 and Example 7 in Table 1 shows that CK4 and CK2 failed, CK8 barely passed, and Examples 1, 4, and 7 all passed, though Example 7 barely passed. This is related to the urea content in the formula. As can be seen, when the mass fraction of polyacrylamide in the excipient is greater than that of Fumei powder, the product metering is affected. Choosing a higher mass fraction of Fumei powder than polyacrylamide significantly reduces metering deviations during production, meeting summer production needs.

[0102] By comparing the data of Example 1 and Example 2, Example 4 and Example 5, and Example 7 and Example 8, it can be seen that the addition of auxiliary materials can make the metering more accurate. Therefore, it is recommended that when the temperature and humidity are high in summer, appropriate addition of auxiliary materials can smoothly carry out the production of high-nitrogen fertilizer.

[0103] By comparing the data of Example 2 and Example 3, Example 5 and Example 6, and Example 8 and Example 9, it can be seen that the measurement of Example 3, Example 6 and Example 9 in which urea and auxiliary materials are added to the crusher for crushing is more accurate than that of Example 2, Example 5 and Example 8 in which the auxiliary materials and fertilizer raw materials are mixed.

Claims

1. A high-nitrogen water-soluble fertilizer, characterized in that The high-nitrogen water-soluble fertilizer has a nitrogen content of 20-30%, a phosphorus content of 10-20%, and a potassium content of 10-20%. The amide nitrogen content in the nitrogen content is greater than or equal to 79%, and the amide nitrogen is provided by urea particles, which are obtained by crushing urea particles with a hardness of 68.7-78.2N through a crusher set to a mesh size of 40-80.

2. high nitrogen water-soluble fertilizer as claimed in claim 1, is characterized in that, The high-nitrogen water-soluble fertilizer further comprises an auxiliary material, which is a mixture of Fumei powder and polyacrylamide; the mass of the Fumei powder in the auxiliary material is greater than the mass of the polyacrylamide.

3. high nitrogen water-soluble fertilizer as claimed in claim 2, is characterized in that, The mass ratio of the Fumei powder to the polyacrylamide in the auxiliary materials is 2-4:1-2.

4. the production method of high nitrogen water-soluble fertilizer as claimed in claim 1, is characterized in that, The urea particles and the water-soluble fertilizer raw materials are added into a container and mixed evenly, and then measured and packaged to obtain the high-nitrogen water-soluble fertilizer; The urea particles, water-soluble fertilizer raw materials and auxiliary materials are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer; The water-soluble fertilizer raw material is one or more of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, ammonium sulfate, potassium pyrophosphate, potassium sulfate, potassium chloride and ammonium chloride; The mass ratio of the urea particles, the water-soluble fertilizer raw material and the auxiliary material is 200-700:286-798:2-14.

5. The production method of high nitrogen water-soluble fertilizer as claimed in claim 2 or 3, wherein The urea granules and auxiliary materials are added to a crusher for crushing to obtain urea microparticles; the urea microparticles and water-soluble fertilizer raw materials are added to a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer; The water-soluble fertilizer raw material is one or more of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, ammonium sulfate, potassium pyrophosphate, potassium sulfate, potassium chloride and ammonium chloride; The mass ratio of the urea granules to the auxiliary materials is 98-99:1-2; the mass ratio of the urea microparticles to the water-soluble fertilizer raw materials is 202-714:286-798.

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