Bio-organic fertilizer for improving yield of crops in saline-alkali soil and preparation method of bio-organic fertilizer

Abstract

The invention discloses a bio-organic fertilizer for improving crop yield in saline-alkali soil and a preparation method thereof, and belongs to the technical field of saline-alkali soil improvement, the bio-organic fertilizer comprises the following raw materials: a microbial agent, an inorganic fertilizer, decomposed animal manure, corncob powder, turfy soil and a crop accelerator; the crop accelerant is prepared from glutathione and betaine; the mass ratio of the two is (1-3): (3-4); the raw materials are simply fermented to prepare the microbial compound fertilizer which not only can improve the soil environment of saline-alkali soil and improve the stress tolerance and yield of crops, but also can reduce environmental pollution.

Description

Technical Field

[0001] The invention belongs to the technical field of saline-alkali land improvement, and in particular relates to a bio-organic fertilizer for increasing the yield of crops in saline-alkali land and a preparation method thereof. Background Art

[0002] Saline-alkali land refers to land with a high salt content and a high pH value. The salt and alkalinity levels in this type of land exceed the tolerance of most crops, severely impacting their growth. Currently, the most common approach to saline-alkali land is to apply compound fertilizers to improve soil structure and reduce salinity. However, existing compound fertilizers still have the following problems:

[0003] 1. Compound fertilizers usually contain high salt content. Long-term application will lead to further accumulation of soil salt, exacerbating the problem of salinization. In addition, certain components in compound fertilizers (such as phosphates) may further increase the soil pH value, affecting crop growth.

[0004] 2. The ratio of nutrients in compound fertilizers may not meet the needs of crops in saline-alkali soil, resulting in nutritional imbalance and affecting crop growth;

[0005] 3. The soil microbial activity in saline-alkali land is low, and compound fertilizers lack beneficial microorganisms, which affects soil fertility and crop growth, that is, reduces crop yield and quality;

[0006] 4. The application of compound fertilizers may cause salt to accumulate on the soil surface, affecting the growth of crop roots;

[0007] 5. Excessive application of compound fertilizers may lead to environmental pollution, such as groundwater pollution, soil compaction, etc., further accelerating salinization.

[0008] Therefore, there is an urgent need to provide a bio-organic fertilizer and a preparation method that can improve soil structure, reduce salinity and alkalinity, and increase crop yield. Summary of the Invention

[0009] In view of the above technical problems, the present invention provides a bio-organic fertilizer for increasing the yield of crops in saline-alkali land and a preparation method thereof.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] One of the technical solutions of the present invention:

[0012] A bio-organic fertilizer for increasing the yield of crops in saline-alkali land, the raw materials comprising:

[0013] Microbial agents, inorganic fertilizers, decomposed animal manure, corn cob meal, peat soil and crop promoters;

[0014] The crop promoter comprises glutathione and betaine, and the mass ratio of the two is (1-3): (3-4).

[0015] Beneficial effects: The interactions between the raw materials in the microbial compound fertilizer defined by the present invention are:

[0016] 1. Use the combined effects of decomposed animal manure, corn cob powder and peat soil to increase soil organic matter content and improve soil structure, that is, improve soil aeration and water retention, and enhance soil fertility and structural stability;

[0017] 2. By limiting the use of organic fertilizers and inorganic fertilizers, the present invention, on the one hand, utilizes the large amount of nutrients provided by inorganic fertilizers to quickly replenish the nutrient deficiency in the soil; on the other hand, it utilizes microbial agents to decompose organic matter, releasing nutrients that can be absorbed by crops, thereby improving soil fertility. This allows the bio-organic fertilizer of the present invention to better meet the needs of crops in saline-alkali land, promote nutritional balance, and increase crop yields.

[0018] 3. Glutathione and betaine work synergistically in saline-alkali land bio-compound fertilizers, significantly improving crop salt tolerance and yield. Betaine maintains intracellular water balance through osmotic regulation, while glutathione protects cells from oxidative damage through antioxidant effects. The two work together to improve crop salt tolerance and stress resistance. Specifically, betaine promotes cell expansion and division by maintaining cell membrane structure and osmotic balance; glutathione protects intracellular enzymes and proteins through antioxidant effects, promoting crop growth and development. Therefore, betaine and glutathione work together to maintain the health and vitality of root cells and improve the root system's ability to absorb water and nutrients.

[0019] 4. Halophilic bacteria and betaine improve the salt tolerance of crops by reducing soil salinity and maintaining intracellular osmotic pressure, further increasing crop yields; Pseudomonas fluorescens and glutathione enhance the disease resistance and antioxidant capacity of crops through antagonistic bacteria and antioxidant effects; Rhizobia increase the nitrogen supply of crops and promote root growth through nitrogen fixation.

[0020] In summary, the above raw materials defined according to the present invention can improve the soil environment and provide comprehensive nutrition for crops, promote the growth and development of crops, and increase the yield and quality of crops.

[0021] Preferably, the microbial agent comprises: halophilic bacteria, cellulolytic bacteria, Pseudomonas fluorescens and rhizobium, with a mass ratio of 1:1:1:1.

[0022] Beneficial effects: The present invention defines four types of microorganisms, among which halophilic bacteria can survive and reproduce in a high-salt environment, can improve the microbial environment of saline-alkali land, and can also reduce the salt content in the soil through metabolism, reducing salt damage; cellulolytic bacteria can decompose cellulose and other complex organic matter in the soil, convert them into small molecular organic matter and inorganic salts that can be absorbed by crops, and by decomposing organic matter, increase the organic matter content of the soil, improve the aeration and water retention of the soil; fluorescent Pseudomonas has strong antagonistic activity, can inhibit the growth of harmful pathogens in the soil, reduce the occurrence of diseases, and can also decompose insoluble phosphates in the soil, convert them into a form that can be absorbed by crops, and improve the utilization rate of phosphate fertilizers; through nitrogen fixation and secretion of organic matter, it improves soil structure and increases soil fertility.

[0023] In summary, the present invention compounds four microorganisms and utilizes the complementary and synergistic effects of halophilic bacteria, cellulolytic bacteria, Pseudomonas fluorescens and rhizobia in saline-alkali land compound fertilizer, thereby significantly improving the soil environment and increasing crop yields.

[0024] Preferably, the concentrations of halophilic bacteria, cellulolytic bacteria, fluorescing pseudomonas and rhizobia in the microbial agent are all (2.5-3)×10 8 CFU.

[0025] Preferably, the bio-organic fertilizer comprises the following raw materials in parts by weight:

[0026] 10-12 parts of microbial agents, 20-25 parts of inorganic fertilizers, 30-40 parts of decomposed animal manure, 8-10 parts of corn cob powder, 8-10 parts of peat soil and 5-10 parts of crop promoters.

[0027] Preferably, the bio-organic fertilizer comprises the following raw materials in parts by weight:

[0028] 12 parts of microbial agent, 25 parts of inorganic fertilizer, 40 parts of decomposed animal feces, 10 parts of corn cob powder, 10 parts of peat soil and 10 parts of crop promoter.

[0029] Preferably, the bio-organic fertilizer comprises the following raw materials in parts by weight:

[0030] 11 parts of microbial agents, 23 parts of inorganic fertilizers, 37 parts of decomposed animal manure, 9 parts of corn cob powder, 9 parts of peat soil and 9 parts of crop promoters.

[0031] Preferably, the bio-organic fertilizer comprises the following raw materials in parts by weight:

[0032] 10 parts of microbial agent, 20 parts of inorganic fertilizer, 30 parts of decomposed animal feces, 8 parts of corn cob powder, 8 parts of peat soil and 5 parts of crop promoter.

[0033] Preferably, the corncob powder has a particle size of 1-2 mm, an organic matter content of 60-80%, and a C / N ratio (carbon-nitrogen ratio) of 20-30:1.

[0034] Preferably, the peat soil has a particle size of 1-5 mm, an organic matter content of 60-80%, and an electrical conductivity of 0.5-1.5 mS / cm.

[0035] Beneficial effects: Within the particle size range of corn cob powder and peat soil defined by the present invention, corn cob powder and peat soil can be better mixed with other components of compound fertilizer, while providing good air permeability and water retention; an organic matter content of 60-80% can improve soil structure and increase the soil's water and fertilizer retention capacity; in addition, corn cob powder with a C / N ratio within the above range can promote microbial activity, accelerate the decomposition of organic matter, and improve fertilizer utilization; peat soil with an electrical conductivity of 0.5-1.5 mS / cm can avoid excessive salt content and further improve the salt tolerance and yield of crops in saline-alkali land.

[0036] The inorganic fertilizer comprises ammonium nitrate, phosphogypsum and potassium sulfate; the mass ratio of the three is (6-8): (6-10): (7-9).

[0037] Preferably, the saline-alkali land crop is rice.

[0038] Preferably, during the process of growing rice in saline-alkali land, the application amount of the microbial compound fertilizer is 100-120 kg / ha.

[0039] The second technical solution of the present invention:

[0040] A method for preparing a bio-organic fertilizer for increasing crop yield in saline-alkali land comprises the following steps:

[0041] (1) Place decomposed animal manure, corn cob powder and peat soil into a mixer and stir at low speed for 10 minutes to ensure uniform mixing;

[0042] (2) Add the inorganic fertilizer into the mixer and continue stirring at low speed for 10 minutes to ensure that the inorganic fertilizer is evenly dispersed;

[0043] (3) Add glutathione and betaine to the mixer and continue stirring at low speed for 10 minutes to ensure that the crop promoters are evenly dispersed;

[0044] (4) Spray the microbial agent on the mixed raw materials and stir at low speed for 10 minutes to ensure that the agent is evenly attached to the raw materials;

[0045] (5) placing the mixed raw materials into a fermentation tank for fermentation;

[0046] (6) Spreading the fermented raw materials flat and placing them in a drying device for drying;

[0047] (7) The dried raw material is crushed and sieved to ensure that the particle size is less than 2 mm, and finally the bio-organic fertilizer is obtained.

[0048] Beneficial effects: In the inorganic fertilizer used in the present invention, phosphogypsum is used as industrial solid waste, and after fermentation, it can reduce the adverse effects of impurities contained in it on crops; further, the raw materials of the present invention are used after fermentation, and during the fermentation process, part of the raw materials are degraded or reacted to generate nutrients that are more conducive to crop absorption, which can further promote the improvement of soil fertility in saline-alkali land.

[0049] Preferably, the rotation speed of the low-speed stirring is 20-50 r / min.

[0050] Preferably, the conditions during the fermentation process are: temperature 30-40° C., humidity 60-70%, sealed fermentation for 4-6 days, and stirring once a day during the fermentation to ensure uniform fermentation.

[0051] Preferably, the conditions in the drying process are: drying at a temperature of 60-70° C. for 12-24 hours until the moisture content is less than 10%.

[0052] Compared with the prior art, the present invention has the following advantages and technical effects:

[0053] The invention discloses a bio-organic fertilizer for increasing the yield of crops in saline-alkali land. Through the synergistic effect of various raw materials, the bio-organic fertilizer can significantly improve the soil environment, increase soil fertility, and ultimately improve the yield and quality of crops.

[0054] The preparation method of the present invention is simple and easy to implement. By using the method of the present invention, a microbial compound fertilizer can be prepared that can not only improve the soil environment of saline-alkali land, increase the stress tolerance and yield of crops, but also reduce environmental pollution, and further promote the development of sustainable agriculture. DETAILED DESCRIPTION

[0055] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0056] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0057] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0058] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the description of the invention. The description and examples are intended to be illustrative only.

[0059] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0060] The "parts" described in the present invention, unless otherwise specified, refer to parts by mass.

[0061] The raw materials used in the present invention are all purchased. The halophilic bacteria used in the following examples are Bacillus halogenus, purchased from the China Agricultural Microbial Culture Collection Center with a deposit number of ACCC 02786; the cellulose-decomposing bacteria were purchased from the China Center for Type Culture Collection with a deposit number of CCTCC No.M208166; the fluorescing Pseudomonas was purchased from the China General Microbial Culture Collection Center with a deposit number of CGMCC No.13703; and the rhizobium was purchased from the China Center for Type Culture Collection with a deposit number of CCTCC No.M2017611. The above strains are activated and expanded before use. The activation and expansion methods can be carried out by conventional techniques in the art. After expansion, the microbial concentration reaches 2.5-3×10 8 CFU.

[0062] The technical solution of the present invention is further illustrated by the following examples.

[0063] Example 1

[0064] A bio-organic fertilizer for increasing the yield of crops in saline-alkali land, comprising the following raw materials in parts by weight:

[0065] 12 parts of microbial agent, 25 parts of inorganic fertilizer, 40 parts of decomposed animal manure, 10 parts of corn cob powder, 10 parts of peat soil and 10 parts of crop promoter;

[0066] The crop promoter includes glutathione and betaine; the mass ratio of the two is 3:4;

[0067] The microbial agents were: halophilic bacteria, cellulolytic bacteria, Pseudomonas fluorescens, and rhizobia, with a mass ratio of 1:1:1:1; the concentration of each microorganism was 3×10 8 CFU;

[0068] The corn cob powder has a particle size of 2 mm; an organic matter content of 80%; a C / N ratio (carbon-nitrogen ratio) of 30:1;

[0069] The particle size of peat soil is 5mm; the organic matter content is 80%; the electrical conductivity is 1.5mS / cm;

[0070] The inorganic fertilizers are ammonium nitrate, phosphogypsum, and potassium sulfate; the mass ratio of the three is 8:10:9;

[0071] The method for preparing the above-mentioned bio-organic fertilizer for increasing crop yield in saline-alkali land comprises the following steps:

[0072] (1) Place decomposed animal manure, corn cob powder, and peat soil into a mixer and stir at 50 rpm for 10 minutes to ensure uniform mixing;

[0073] (2) Add the inorganic fertilizer into the mixer and continue stirring at a speed of 50 r / min for 10 minutes to ensure that the inorganic fertilizer is evenly dispersed;

[0074] (3) Add glutathione and betaine to the mixer and continue stirring at 50 r / min for 10 minutes to ensure that the crop promoters are evenly dispersed;

[0075] (4) Spray the microbial agent on the mixed raw materials and stir at a speed of 50 r / min for 10 minutes to ensure that the agent is evenly attached to the raw materials;

[0076] (5) placing the mixed raw materials into a fermentation tank for fermentation under the following conditions: temperature of 30-40°C, humidity of 60-70%, sealed and fermented for 6 days, with the tank turned once a day;

[0077] (6) The fermented raw materials were flattened and placed in a drying equipment for drying. The drying conditions were: drying at 70°C for 24 hours until the moisture content was less than 10%;

[0078] (7) The dried raw material is crushed and sieved to ensure that the particle size is less than 2 mm, and finally the bio-organic fertilizer is obtained.

[0079] Example 2

[0080] The difference from Example 1 is that

[0081] Bio-organic fertilizer, calculated in parts by weight, comprises the following raw materials:

[0082] 11 parts of microbial agent, 23 parts of inorganic fertilizer, 37 parts of decomposed animal manure, 9 parts of corn cob powder, 9 parts of peat soil and 9 parts of crop promoter;

[0083] The crop growth promoter includes glutathione and betaine in a mass ratio of 1:1. Other raw material ratios and preparation conditions are the same as those in Example 1.

[0084] Example 3

[0085] The difference from Example 1 is that

[0086] Bio-organic fertilizer, calculated in parts by weight, comprises the following raw materials:

[0087] 10 parts of microbial agent, 20 parts of inorganic fertilizer, 30 parts of decomposed animal manure, 8 parts of corn cob powder, 8 parts of peat soil and 5 parts of crop promoter;

[0088] The crop growth promoter includes glutathione and betaine in a mass ratio of 1:1. Other raw material ratios and preparation conditions are the same as those in Example 1.

[0089] Example 4

[0090] The difference from Example 1 is that

[0091] The microbial agents were: halophilic bacteria, cellulolytic bacteria, Pseudomonas fluorescens, and rhizobia, with a mass ratio of 1:1:1:1; the concentration of each microorganism was 2.5×10 8 CFU.

[0092] Example 5

[0093] The difference from Example 1 is that

[0094] The corn cob powder has a particle size of 1 mm; an organic matter content of 60%; a C / N ratio (carbon-nitrogen ratio) of 20:1;

[0095] The particle size of peat soil is 1mm; the organic matter content is 60%; the electrical conductivity is 0.5mS / cm;

[0096] The inorganic fertilizers are: ammonium nitrate, phosphogypsum, and potassium sulfate; the mass ratio of the three is: 6:6:7.

[0097] Example 6

[0098] The difference from Example 1 is that

[0099] The corn cob powder has a particle size of 2 mm; an organic matter content of 70%; a C / N ratio (carbon-nitrogen ratio) of 25:1;

[0100] The particle size of peat soil is 3mm; the organic matter content is 70%; the electrical conductivity is 1mS / cm;

[0101] The inorganic fertilizers are: ammonium nitrate, phosphogypsum, and potassium sulfate; the mass ratio of the three is: 6:8:9.

[0102] Example 7

[0103] The difference from Example 1 is that

[0104] In the preparation process of the bio-organic fertilizer, the fermentation conditions in step (5) are: temperature 36° C., humidity 67%, sealed fermentation for 5 days, and stirring once a day;

[0105] The drying conditions in step (6) are: drying at a temperature of 65° C. for 18 hours until the moisture content is less than 10%.

[0106] Example 8

[0107] The difference from Example 1 is that

[0108] Step (5) fermentation conditions are: temperature 30°C, humidity 60%, sealed and fermented for 4 days, during which time the mixture is stirred once a day;

[0109] The drying conditions in step (6) are: drying at 60° C. for 12 hours until the moisture content is less than 10%.

[0110] Comparative Example 1

[0111] The difference from Example 1 is that glutathione is not added, and the amounts of other raw materials and preparation conditions are the same as in Example 1.

[0112] Comparative Example 2

[0113] The difference from Example 1 is that betaine is not added. The amounts of other raw materials and preparation conditions are the same as those in Example 1.

[0114] Comparative Example 3

[0115] The difference from Example 1 is that the mass ratio of glutathione to betaine is 2:1. The amounts of other raw materials and preparation conditions are the same as those in Example 1.

[0116] Comparative Example 4

[0117] The difference from Example 1 is that the microbial agents are: cellulolytic bacteria, Pseudomonas fluorescens and Rhizobium, with a mass ratio of 1:1:1. The other raw material amounts and preparation conditions are the same as in Example 1.

[0118] Comparative Example 5

[0119] The difference from Example 1 is that the microbial agents are: halophilic bacteria, cellulolytic bacteria and rhizobium, with a mass ratio of 1:1:1. The other raw material amounts and preparation conditions are the same as in Example 1.

[0120] Comparative Example 6

[0121] The difference from Example 1 is that the microbial agents are: halophilic bacteria, Pseudomonas fluorescens and rhizobium, with a mass ratio of 1:1:1. The amounts of other raw materials and preparation conditions are the same as in Example 1.

[0122] Comparative Example 7

[0123] The difference from Example 1 is that the fermentation process of step (5) is omitted.

[0124] Effect verification

[0125] 1. Output

[0126] The biocomposite fertilizers prepared in Examples 1-8 and Comparative Examples 1-7 were used in a rice planting and fertilization test. The biocomposite fertilizers prepared in the present invention met the requirements of GB / T 15063-2020.

[0127] The soil parameter conditions of the selected saline-alkali land are shown in Table 1:

[0128] Table 1

[0129] pH Salt content Organic matter content Cation Exchange Capacity (CEC) Electrical conductivity (EC value) 8-8.5 0.4-0.5％ 2-5％ 10-20 cmol / kg 3-5mS / cm

[0130] Yanfeng No. 6 was selected as the test material for growing rice, and saline-alkali land in the same area was selected and divided into 16 test plots (corresponding to Examples 1-8, Comparative Examples 1-7, and a control group (applied with conventional organic fertilizer)) for conventional breeding and cultivation experiments; the field management measures of each test plot were consistent;

[0131] The fertilization method is as follows: before rice planting, the microbial compound fertilizers prepared in Examples 1-8 and Comparative Examples 1-7 and conventional organic fertilizers are applied at once through furrow application, with the application amount of both being 100 kg / ha.

[0132] The effects of compound fertilizer application on the Yanfeng No. 6 rice variety in each experimental field were statistically analyzed, as shown in Table 2:

[0133] Table 2

[0134] <![CDATA[Yield / (t·hm -2 )]]> Example 1 620 Example 2 616 Example 3 608 Example 4 612 Example 5 606 Example 6 611 Example 7 613 Example 8 617 Comparative Example 1 430 Comparative Example 2 445 Comparative Example 3 438 Comparative Example 4 428 Comparative Example 5 422 Comparative Example 6 426 Comparative Example 7 418 Conventional organic fertilizer 387

[0135] As can be seen from Table 2, the application of the microbial compound fertilizers prepared in Examples 1-8 of the present invention on saline-alkali land can significantly increase rice yield. Comparison of Comparative Examples 1-2 with Example 1 shows that glutathione and betaine, when used in saline-alkali land biocompound fertilizers, work synergistically to significantly improve the salt tolerance and yield of crops.

[0136] 2. Soil desalination rate of saline-alkali land

[0137] The desalination rate refers to the percentage of the reduction in soil salt content in the test area to the initial value, which can evaluate the desalination effect of the soil layer.

[0138] The calculation formula of soil desalination rate is: N = (S1-S2) / S1×100%;

[0139] Where: N is the desalination rate, %; S1 is the electrical conductivity of the saline-alkali soil before the test, ms / cm; S2 is the electrical conductivity of the saline-alkali soil after the test, ms / cm.

[0140] Table 3 Desalination rate of saline-alkali land after applying different compound fertilizers

[0141] Desalination rate / % Example 1 15.6 Example 2 14.9 Example 3 15.0 Example 4 15.1 Example 5 14.8 Example 6 14.7 Example 7 14.4 Example 8 14.2 Comparative Example 1 7.6 Comparative Example 2 6.8 Comparative Example 3 7.4 Comparative Example 4 6.2 Comparative Example 5 7.9 Comparative Example 6 7.6 Comparative Example 7 6.5 Conventional organic fertilizer 4.5

[0142] As shown in Table 3, the application of the microbial compound fertilizers of Examples 1-8 of the present invention in saline-alkali soil can significantly reduce the soil electrical conductivity, and the maximum desalination rate reaches 15.6%, indicating that the application of the microbial compound fertilizers prepared by the present invention can effectively alleviate salt stress.

[0143] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A bio-organic fertilizer for increasing crop yield in saline-alkali land, characterized in that: Including the following ingredients: Microbial agents, inorganic fertilizers, decomposed animal manure, corn cob meal, peat soil and crop promoters; The crop promoter comprises glutathione and betaine; the mass ratio of the two is (1-3): (3-4).

2. A biological organic fertilizer for improving crop yield in saline-alkali land according to claim 1, characterized in that, The microbial agent comprises: halophilic bacteria, cellulose decomposing bacteria, fluorescing pseudomonas and rhizobium, with a mass ratio of 1:1:1:

1.

3. A biological organic fertilizer for improving crop yield in saline-alkali land according to claim 2, characterized in that, The concentrations of halophilic bacteria, cellulose decomposing bacteria, fluorescent pseudomonas and rhizobium in the microbial agent are all (2.5-3)×10 8 CFU.

4. A biological organic fertilizer for improving crop yield in saline-alkali land according to claim 1, characterized in that, The bio-organic fertilizer comprises the following raw materials in parts by weight: 10-12 parts of microbial agents, 20-25 parts of inorganic fertilizers, 30-40 parts of decomposed animal manure, 8-10 parts of corn cob powder, 8-10 parts of peat soil and 5-10 parts of crop promoters.

5. A biological organic fertilizer for improving crop yield in saline-alkali land according to claim 4, characterized in that, The bio-organic fertilizer comprises the following raw materials in parts by weight: 11 parts of microbial agents, 23 parts of inorganic fertilizers, 37 parts of decomposed animal manure, 9 parts of corn cob powder, 9 parts of peat soil and 9 parts of crop promoters.

6. A biological organic fertilizer for increasing crop yield in saline-alkali land according to claim 1, characterized in that: The corncob powder has a particle size of 1-2 mm, an organic matter content of 60-80%, and a C / N ratio (carbon-nitrogen ratio) of 20-30:

1.

7. A biological organic fertilizer for increasing crop yield in saline-alkali land according to claim 1, characterized in that: The peat soil has a particle size of 1-5 mm, an organic matter content of 60-80%, and an electrical conductivity of 0.5-1.5 mS / cm.

8. A biological organic fertilizer for increasing crop yield in saline-alkali land according to claim 1, characterized in that: The inorganic fertilizers include: ammonium nitrate, phosphogypsum, and potassium sulfate; The mass ratio of the three is: (6-8): (6-10): (7-9).

9. A method for preparing a bio-organic fertilizer for improving crop yield in saline-alkali land as described in any one of claims 1 to 8, characterized in that: The following steps are involved: Add the decomposed animal excrement, corn cob powder, peat soil, inorganic fertilizer, crop promoter and microbial agent into a mixer in this order and stir and mix at a low speed to obtain a mixture; The mixture is sequentially sealed for fermentation, dried and crushed to prepare the bio-organic fertilizer.

10. The method for preparing a bio-organic fertilizer for increasing crop yield in saline-alkali land according to claim 9, characterized in that: The conditions during the fermentation process are: temperature 30-40°C, humidity 60-70%, sealed fermentation for 4-6 days; The conditions in the drying process are: drying at a temperature of 60-70° C. for 12-24 hours until the moisture content is less than 10%.