Special soil testing formula fertilizer for oilseed rape and preparation method of special soil testing formula fertilizer

Abstract

The invention discloses a special soil testing formula fertilizer for oilseed rape and a preparation method thereof, and belongs to the technical field of agricultural fertilizers. The invention relates to a special soil testing formula fertilizer for oilseed rape, which is prepared from the following components in parts by weight: 70 to 80 parts of leavening, 10 to 15 parts of modified nano zeolite, 5 to 8 parts of MgSO4. 7H2O, 3 to 5 parts of Na2B4O7. 10H2O, 2 to 3 parts of Ca3 (PO4) 2, 1 to 3 parts of KCl and 1 to 3 parts of NaNO3, wherein the leavening comprises 90-100 parts of rape straw, 30-40 parts of rapeseed dregs and 0.5-1 part of compound zymophyte; wherein the modified nano zeolite comprises 70-75 parts of sodium silicate, 10-15 parts of ethylene glycol, 24-27 parts of aluminum sulfate, 8-9 parts of sodium hydroxide and 2-3 parts of hexadecyl trimethyl ammonium bromide. Organic fertilizer and inorganic fertilizer are cooperatively applied, so that the utilization rate of the fertilizer is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a soil testing formula fertilizer special for rapeseed and a preparation method thereof. Background Art

[0002] Frequent application of single fertilizers or ordinary compound fertilizers leads to low rapeseed yields and unstable oil content. These rapeseed-specific fertilizers are usually made into compound fertilizers by adding raw materials containing sulfur, boron, iron, manganese, molybdenum and other raw materials on the basis of nitrogen, phosphorus and potassium raw materials. This type of rapeseed-specific fertilizer usually has obvious effects, such as improving the stable growth of rapeseed in various growth periods, improving drought resistance, disease resistance, and lodging resistance, increasing rapeseed yield, and increasing rapeseed oil content; but it also has the disadvantages of too complex ingredients, too many types of raw materials, unreasonable formula, too high raw material cost, complicated preparation process, and high cost.

[0003] Soil testing and formula fertilizer are based on soil testing and fertilizer field tests. According to the fertilizer requirements of crops, soil fertilizer supply performance and fertilizer effect, nitrogen, phosphorus and potassium mixed inorganic fertilizers are reasonably added to organic fertilizers. The two are reasonably applied in combination and complement each other. The organic acid produced by the decomposition of organic matter can also promote the dissolution of mineral nutrients in soil and chemical fertilizers. Organic fertilizers and chemical fertilizers promote each other, which is beneficial to crop absorption and improves the utilization rate of fertilizers. The patent application with publication number CN 102826898 A discloses a special fertilizer for rapeseed, which hydrolyzes hair into amino acids to generate amino acid chelated medium and micro fertilizer liquid, then sintering quartz sand to obtain a fertilizer carrier, organic fertilizer fermentation, and then mixing nitrogen, phosphorus and potassium fertilizers with carriers and organic fertilizers and botanical pesticides, granulating, and finally coating with holly oil. The fertilizer applied for can significantly improve the fertilizer utilization rate and have a slow-release effect; however, the process is relatively complicated, and the raw materials and energy consumption are high. Developing a new soil-tested formula fertilizer specifically for rapeseed, which has a simple and easy process, readily available raw materials, and can achieve a balanced supply of crop nutrients to meet the needs of crops is an urgent problem to be solved today. Summary of the invention

[0004] The purpose of the present invention is to provide a soil testing formula fertilizer special for rapeseed and a preparation method thereof, so as to improve the yield and quality of rapeseed.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A soil-testing formula fertilizer for rapeseed, comprising, by weight, 70 to 80 parts of fermentation product, 10 to 15 parts of modified nano zeolite, 5 to 8 parts of MgSO 4 7H 2 O, 3 to 5 parts of Na 2 B 4 O 7 10H 2 O, 2-3 parts Ca3 (PO 4 ) 2 , 1 to 3 parts KCl, 1 to 3 parts NaNO 3 ;

[0007] The fermented material comprises 90-100 parts of rape straw, 30-40 parts of rapeseed meal and 0.5-1 part of composite fermentation bacteria.

[0008] Furthermore, the modified nano zeolite is prepared by the following steps:

[0009] Sodium silicate and ethylene glycol are placed in deionized water and mixed to obtain a mixed solution, an aluminum sulfate aqueous solution and a sodium hydroxide aqueous solution are slowly added dropwise to the mixed solution, heated and stirred, the pH value is adjusted to neutral, filtered, dried, and sintered to obtain nano zeolite; the nano zeolite and a hexadecyltrimethylammonium bromide aqueous solution are mixed, heated and stirred, and washed and dried to obtain a modified nano zeolite.

[0010] Furthermore, the mass ratio of the sodium silicate, ethylene glycol, aluminum sulfate and sodium hydroxide is (70-75): (10-15): (24-27): (8-9); the mass ratio of the nano zeolite and hexadecyltrimethylammonium bromide is (10-15): (2-3).

[0011] Furthermore, the heating and stirring conditions are stirring at 50-60°C for 8-10 hours; the drying temperature is 100-110°C; and the sintering is sintering at 600-700°C for 6-8 hours.

[0012] Furthermore, the concentration of the aluminum sulfate aqueous solution is 0.2-0.3 g / mL; the concentration of the sodium hydroxide aqueous solution is 0.05-0.1 g / mL; and the content of hexadecyltrimethylammonium bromide in the hexadecyltrimethylammonium bromide aqueous solution is 1%-2%.

[0013] A method for preparing a soil testing formula fertilizer specifically for rapeseed comprises the following steps:

[0014] S1, mixing rape straw, rapeseed meal and composite fermentation bacteria, fermenting and drying to obtain a fermentation product;

[0015] S2, modified nano zeolite, MgSO 4 7H 2 O、Na 2 B 4 O 7 10H 2 O, Ca 3 (PO 4 ) 2 , KCl, NaNO 3The product is mixed with water, heated and stirred, dried, fermented material is added, mixed and granulated to obtain a soil-testing formula fertilizer specially used for rapeseed.

[0016] Furthermore, the composite fermentation bacteria include white rot fungi, Bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria, and the dosage ratio of the white rot fungi, Bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria is (1-2):(0.5-1):(0.5-1).

[0017] Furthermore, the fermentation condition is 30-35°C for 7-10 days; the drying temperature is 55-60°C.

[0018] Furthermore, the stirring in S2 is carried out at 50-60°C for 4-5 hours, and the drying temperature in S2 is 100-110°C.

[0019] Furthermore, the particle size of the granulation is 3 to 5 mm.

[0020] Beneficial effects of the present invention:

[0021] (1) The present invention provides a soil-tested formula fertilizer specifically for rapeseed, which uses organic fertilizer and reasonably adds mixed inorganic fertilizer. The organic acid produced by the decomposition of organic matter can also promote the dissolution of mineral nutrients in the soil and chemical fertilizer. The organic fertilizer and chemical fertilizer promote each other, which is beneficial to crop absorption and improves the utilization rate of fertilizer.

[0022] (2) The composite fermentation bacteria used in the present invention, the white rot fungi, can not only secrete lignin decomposing enzymes, destroy the lignin barrier, change the structure of lignocellulose, and make the cellulose and hemicellulose therein easier to bioconvert; they can also kill most parasites and pathogens, shorten the composting time, and greatly improve the yield and quality of organic fertilizer. Bacillus amyloliquefaciens, as a Bacillus, can not only decompose the cellulose in the straw, but also effectively reduce the content of acids and phenols produced by the fermentation of white rot fungi, thereby improving the decomposition effect of the straw. And brown ball nitrogen-fixing bacteria can improve the nitrogen utilization efficiency of crops and reduce the loss of nitrogen fertilizer.

[0023] (3) The nano zeolite used in the present invention is artificially synthesized and has a smaller particle size and a larger specific surface area, and can adsorb the cations required for rapeseed growth. After being modified with hexadecyltrimethylammonium bromide, the adsorption of the nano zeolite to anions is improved, and it can provide nutrients for rapeseed for a longer period of time, achieving a slow-release effect. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] This embodiment provides a soil testing formula fertilizer for rapeseed, which is prepared by the following steps:

[0027] S1, 100g rape straw, 40g rapeseed meal and 1g composite fermentation bacteria (white rot fungi, Bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria were mixed in a mass ratio of 2:1:0.5), fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0028] 75 g of sodium silicate and 15 g of ethylene glycol were placed in 150 mL of deionized water and mixed to obtain a mixed solution, 80 mL of an aluminum sulfate aqueous solution with a concentration of 0.3 g / mL and 80 mL of a sodium hydroxide aqueous solution with a concentration of 0.1 g / mL were slowly added dropwise to the mixed solution, stirred at 60° C. for 8 h, the pH was adjusted to neutral, filtered, dried, and sintered to obtain nano zeolite; 15 g of nano zeolite was mixed with 120 mL of a 2% hexadecyltrimethylammonium bromide aqueous solution, stirred at 60° C. for 8 h, and washed and dried to obtain modified nano zeolite.

[0029] S2, 15g modified nano zeolite, 8g MgSO 4 7H 2 O, 5g Na 2 B 4 O 7 10H 2 O, 3gCa 3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3 The mixture was mixed with 500 mL of water, stirred at 60° C. for 4 h, dried at 105° C., and 80 g of fermentation product was added. The mixture was mixed and granulated into a particle size of 4 mm to obtain a soil-testing formula fertilizer specially for rapeseed.

[0030] Example 2

[0031] The difference between this embodiment and embodiment 1 is that the "15g modified nano zeolite, 8g MgSO 4 7H 2 O, 5gNa 2 B 4 O 7 10H 2 O, 3g Ca3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3 ", "80g fermentation product" was changed to "10g modified nano zeolite, 8g MgSO 4 7H 2 O, 5g Na 2 B 4 O 7 10H 2 O, 3gCa 3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3 ”, “70g fermentation product”.

[0032] The remaining raw materials and preparation process remain the same as in Example 1.

[0033] Example 3

[0034] The difference between this embodiment and embodiment 1 is that the "15g modified nano zeolite, 8g MgSO 4 7H 2 O, 5gNa 2 B 4 O 7 10H 2 O, 3g Ca 3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3 ", "80g fermentation product" was changed to "15g modified nano zeolite, 6g MgSO 4 7H 2 O, 4g Na 2 B 4 O 7 10H 2 O, 3gCa 3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3 ”, “70g fermentation product”.

[0035] The remaining raw materials and preparation process remain the same as in Example 1.

[0036] Example 4

[0037] The present embodiment is different from the embodiment 1 in that "1 g of compound fermentation bacteria" in S1 is changed to "0.5 g of compound fermentation bacteria".

[0038] The remaining raw materials and preparation process remain the same as in Example 1.

[0039] Example 5

[0040] Compared with Example 1, the present embodiment is different in that "white rot fungi, Bacillus amyloliquefaciens and Azotobacter chlororaphis are mixed in a mass ratio of 2:1:0.5" in S1 is changed to "white rot fungi, Bacillus amyloliquefaciens and Azotobacter chlororaphis are mixed in a mass ratio of 1:1:1".

[0041] The remaining raw materials and preparation process remain the same as in Example 1.

[0042] Example 6

[0043] The present embodiment is different from the embodiment 1 in that the “fermentation at 30° C. for 8 days” in S1 is changed to “fermentation at 35° C. for 7 days”.

[0044] The remaining raw materials and preparation process remain the same as in Example 1.

[0045] Comparative Example 1

[0046] Compared with Example 1, this comparative example differs in that no modified nano zeolite is added, and the specific implementation steps are as follows:

[0047] S1, 100g rape straw, 40g rapeseed meal and 1g composite fermentation bacteria (white rot fungi, Bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria were mixed in a mass ratio of 2:1:0.5), fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0048] S2, 8g MgSO 4 7H 2 O, 5g Na 2 B 4 O 7 10H 2 O, 3g Ca 3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3 The mixture was mixed with 80 g of fermented product and granulated into a particle size of 4 mm to obtain a soil-testing formula fertilizer specially used for rapeseed.

[0049] The remaining raw materials and preparation process remain the same as in Example 1.

[0050] Comparative Example 2

[0051] Compared with Example 1, the difference between this comparative example is that the nano zeolite is not modified, and the specific implementation steps are as follows:

[0052] S1, 100g rape straw, 40g rapeseed meal and 1g composite fermentation bacteria (white rot fungi, Bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria were mixed in a mass ratio of 2:1:0.5), fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0053] 75 g of sodium silicate and 15 g of ethylene glycol were placed in 150 mL of deionized water and mixed to obtain a mixed solution, 80 mL of an aqueous solution of aluminum sulfate with a concentration of 0.3 g / mL and 80 mL of an aqueous solution of sodium hydroxide with a concentration of 0.1 g / mL were slowly added dropwise to the mixed solution, stirred at 60° C. for 8 h, the pH was adjusted to neutral, filtered, dried, and sintered to obtain nano zeolite;

[0054] S2, 15g nano zeolite, 8g MgSO 4 7H 2 O, 5g Na 2 B 4 O 7 10H 2 O, 3g Ca 3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3 The mixture was mixed with 500 mL of water, stirred at 60° C. for 4 h, dried at 105° C., and 80 g of fermentation product was added. The mixture was mixed and granulated into a particle size of 4 mm to obtain a soil-testing formula fertilizer specially for rapeseed.

[0055] The remaining raw materials and preparation process remain the same as in Example 1.

[0056] Comparative Example 3

[0057] Compared with Example 1, this comparative example differs in that natural zeolite is used, and the specific implementation steps are as follows:

[0058] S1, 100g rape straw, 40g rapeseed meal and 1g composite fermentation bacteria (white rot fungi, Bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria were mixed in a mass ratio of 2:1:0.5), fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0059] S2, 15g natural zeolite, 8g MgSO 4 7H 2 O, 5g Na 2 B 4 O 7 10H 2 O, 3g Ca 3 (PO 4 ) 2 , 2g KCl, 3g NaNO 3The mixture was mixed with 500 mL of water, stirred at 60° C. for 4 h, dried at 105° C., and 80 g of fermentation product was added. The mixture was mixed and granulated into a particle size of 4 mm to obtain a soil-testing formula fertilizer specially for rapeseed.

[0060] The remaining raw materials and preparation process remain the same as in Example 1.

[0061] Comparative Example 4

[0062] Compared with Example 1, this comparative example differs in that no white rot fungi are added in S1, and the specific implementation steps are as follows:

[0063] S1, 100g rape straw, 40g rapeseed meal and 1g composite fermentation bacteria (Bacillus amyloliquefaciens and Azotobacter chlororossi were mixed in a mass ratio of 1:0.5), fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0064] The remaining raw materials and preparation process remain the same as in Example 1.

[0065] Comparative Example 5

[0066] Compared with Example 1, this comparative example differs in that no Bacillus amyloliquefaciens is added to S1, and the specific implementation steps are as follows:

[0067] S1, 100g rape straw, 40g rapeseed meal and 1g composite fermentation bacteria (white rot fungi and brown ball nitrogen-fixing bacteria are mixed in a mass ratio of 2:0.5) were mixed, fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0068] The remaining raw materials and preparation process remain the same as in Example 1.

[0069] Comparative Example 6

[0070] Compared with Example 1, the difference between this comparative example is that white rot fungi and Bacillus amyloliquefaciens are not added in S1 at the same time, and the specific implementation steps are as follows:

[0071] S1, 100g rape straw, 40g rapeseed meal and 1g brown ball nitrogen-fixing bacteria were mixed, fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0072] The remaining raw materials and preparation process remain the same as in Example 1.

[0073] Comparative Example 7

[0074] Compared with Example 1, this comparative example differs in that no inorganic fertilizer is added, and the specific implementation steps are as follows:

[0075] S1, 100g rape straw, 40g rapeseed meal and 1g composite fermentation bacteria (white rot fungi, Bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria were mixed in a mass ratio of 2:1:0.5), fermented at 30°C for 8d, and dried at 55°C to obtain a fermentation product;

[0076] 75 g of sodium silicate and 15 g of ethylene glycol were placed in 150 mL of deionized water and mixed to obtain a mixed solution, 80 mL of an aluminum sulfate aqueous solution with a concentration of 0.3 g / mL and 80 mL of a sodium hydroxide aqueous solution with a concentration of 0.1 g / mL were slowly added dropwise to the mixed solution, stirred at 60° C. for 8 h, the pH was adjusted to neutral, filtered, dried, and sintered to obtain nano zeolite; 15 g of nano zeolite was mixed with 120 mL of a 2% hexadecyltrimethylammonium bromide aqueous solution, stirred at 60° C. for 8 h, and washed and dried to obtain modified nano zeolite.

[0077] S2. 15 g of modified nano-zeolite and 80 g of fermented product were mixed and granulated. The particle size of the granulated product was 4 mm, and a soil-testing formula fertilizer specially used for rapeseed was obtained.

[0078] The remaining raw materials and preparation process remain the same as in Example 1.

[0079] This soil-tested formula fertilizer specifically for rapeseed should be applied in combination with land preparation before sowing or transplanting, at a rate of 35-45 kg / mu, by broadcasting, furrow application or hole application. Care should be taken to keep a distance of 6-10 cm between the fertilizer particles and the rapeseed seeds or roots to prevent seed, root and seedling burns. Cover with soil promptly after application.

[0080] The rapeseed soil testing formula fertilizers prepared by Examples 1 to 6 and Comparative Examples 1 to 7 were used to record the rapeseed yield (kg), oil yield (%) and rapeseed oil erucic acid content (%). The results are shown in Table 1:

[0081] Table 1

[0082]

[0083]

[0084] It can be seen from Table 1 that by applying the rapeseed-specific soil-testing formula fertilizer prepared in Example 1, the per-acre yield of rapeseed reaches 465.7 kg, and the oil yield and rapeseed oil erucic acid content are 36.3% and 2.9%, respectively; compared with Example 1, the only difference between Examples 2 to 6 is the change in the raw material ratio within a reasonable range. From the results in Table 1, it can be seen that the yield and oil yield of rapeseed can be increased.

[0085] Compared with Example 1, since the modified nano zeolite not only adsorbs cations by ion exchange, but also absorbs anions such as B 4 O7 2- and PO 4 3- It also has adsorption properties, which provides nutrients for the long-term growth and development of rapeseed and achieves a slow-release effect; compared with comparative example 1, the zeolite synthesized by the present invention has a smaller and more uniform particle size and a larger specific surface area than natural zeolite, and has better adsorption properties for ions, so it can better promote the growth of rapeseed; compared with example 1, comparative examples 4 to 6, since white rot fungi can not only secrete lignin decomposing enzymes to decompose lignin, but also kill most parasites and pathogens, shorten the composting time, and Bacillus amyloliquefaciens can not only decompose cellulose in straw but also effectively reduce the content of acids and phenols produced by white rot fungal fermentation, improve the decomposition effect of straw, and thus increase rapeseed yield; compared with example 1, comparative example 7 reasonably adds mixed inorganic fertilizers on the basis of organic fertilizers, and the two are used in combination. The organic acids produced by the decomposition of organic matter can also promote the dissolution of mineral nutrients in soil and fertilizers, which can meet the nutrient requirements of rapeseed at different growth stages and are more conducive to crop absorption.

[0086] In summary, the soil-testing formula fertilizer for rapeseed and the preparation method thereof provided by the present invention improve the per-acre yield, oil yield rate and quality of rapeseed oil of rapeseed, and have good application prospects in the field of agricultural fertilizer technology.

[0087] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0088] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil testing formula fertilizer for rapeseed, characterized in that: In parts by weight, it comprises 70 to 80 parts of fermentation material, 10 to 15 parts of modified nano zeolite, 5 to 8 parts of MgSO4·7H2O, 3 to 5 parts of Na2B4O7·10H2O, 2 to 3 parts of Ca3(PO4)2, 1 to 3 parts of KCl, and 1 to 3 parts of NaNO3; The fermented material comprises 90-100 parts of rape straw, 30-40 parts of rapeseed meal and 0.5-1 part of composite fermentation bacteria.

2. A soil testing formula fertilizer for rapeseed according to claim 1, characterized in that: The modified nano zeolite is prepared by the following steps: Sodium silicate and ethylene glycol are placed in deionized water and mixed to obtain a mixed solution, an aluminum sulfate aqueous solution and a sodium hydroxide aqueous solution are slowly added dropwise to the mixed solution, heated and stirred, the pH value is adjusted to neutral, filtered, dried, and sintered to obtain nano zeolite; the nano zeolite and a hexadecyltrimethylammonium bromide aqueous solution are mixed, heated and stirred, and washed and dried to obtain a modified nano zeolite.

3. A soil testing formula fertilizer for rapeseed according to claim 2, characterized in that: The mass ratio of the sodium silicate, ethylene glycol, aluminum sulfate and sodium hydroxide is (70-75): (10-15): (24-27): (8-9); the mass ratio of the nano zeolite and hexadecyltrimethylammonium bromide is (10-15): (2-3).

4. The soil testing formula fertilizer for rapeseed according to claim 2, characterized in that: The heating and stirring conditions are stirring at 50-60° C. for 8-10 hours; the drying temperature is 100-110° C.; and the sintering is sintering at 600-700° C. for 6-8 hours.

5. The soil testing formula fertilizer for rapeseed according to claim 2, characterized in that: The concentration of the aluminum sulfate aqueous solution is 0.2-0.3 g / mL; the concentration of the sodium hydroxide aqueous solution is 0.05-0.1 g / mL; and the content of hexadecyltrimethylammonium bromide in the hexadecyltrimethylammonium bromide aqueous solution is 1%-2%.

6. A method for preparing a soil testing formula fertilizer for rapeseed according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, mixing rape straw, rapeseed meal and composite fermentation bacteria, fermenting and drying to obtain a fermentation product; S2. Mix the modified nano zeolite, MgSO4·7H2O, Na2B4O7·10H2O, Ca3(PO4)2, KCl, NaNO3 and water, heat and stir, dry, add the fermentation product, mix and granulate, and obtain a soil testing formula fertilizer specially for rapeseed.

7. The method for preparing a soil testing formula fertilizer for rapeseed according to claim 6, characterized in that: The composite fermentation bacteria include white rot fungi, bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria, and the dosage ratio of the white rot fungi, bacillus amyloliquefaciens and brown spherical nitrogen-fixing bacteria is (1-2):(0.5-1):(0.5-1).

8. The method for preparing a soil testing formula fertilizer for rapeseed according to claim 6, characterized in that: The fermentation conditions are as follows: fermentation at 30-35°C for 7-10 days; and the drying temperature is 55-60°C.

9. The method for preparing a soil testing formula fertilizer for rapeseed according to claim 6, characterized in that: The stirring in S2 is performed at 50-60°C for 4-5 hours, and the drying temperature in S2 is 100-110°C.

10. The method for preparing a soil testing formula fertilizer specifically for rapeseed according to claim 6, characterized in that: The particle size of the granulation is 3 to 5 mm.

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