Strong-acidity composite liquid phosphate fertilizer capable of improving saline-alkali land structure

Abstract

The invention discloses a strongly acidic composite liquid phosphate fertilizer capable of improving a saline-alkali land structure, which is prepared by the following steps: mixing a fermentation broth A prepared from animal waste and a fermentation broth B prepared from soybean meal, soybean curb residue, animal bone, rice bran and straw in proportion, adding 2, 5-furandimethanol, mixing, adding an acid-base regulator to regulate the pH value to 2.8-3.2, and fermenting to obtain the strongly acidic composite liquid phosphate fertilizer. The strong-acidity compound liquid phosphate fertilizer is obtained. According to the method, different leavening agents are adopted for fermenting the animal waste twice, ventilation treatment is carried out, the nutrition of fermentation liquor is improved, and stink is reduced. Meanwhile, 2, 5-furandimethanol is added, a cross-linked structure is generated, the release rate of nutritional ingredients in the compound liquid phosphate fertilizer is slowed down, and stable and healthy growth of crops is promoted. The strongly acidic composite liquid phosphate fertilizer prepared by the invention can effectively reduce the pH value of saline-alkali land, improve the saline-alkali land structure, improve the soil microenvironment, increase the emergence rate and survival rate of crops, promote the growth and development of the crops, and improve the yield and quality of the crops.

Description

Technical Field

[0001] The invention relates to the technical field of compound phosphate fertilizers, and in particular to a strongly acidic compound liquid phosphate fertilizer capable of improving saline-alkali soil structure. Background Art

[0002] Saline-alkali land is a general term for saline soil and alkaline soil. Saline-alkali soil mainly refers to salinized soil with high chloride or sulfate content and alkaline soil. Alkaline soil refers to soil containing carbonate or heavy phosphate and has a high pH value. The formation of saline-alkali land is mainly due to the high salt content in the soil, the alkaline soil, and the low organic matter content, which leads to the destruction of soil structure, decreased fertility, poor physical and chemical properties, and many anions and cations that are harmful to crops, affecting plant growth. At the same time, the salinization of the land will also affect the quality of groundwater, leading to an increase in the salt content in the groundwater, further affecting the health of humans and animals. Therefore, it is necessary to improve saline-alkali land through fertilizers.

[0003] At present, most of the organic fertilizers on the market are solid. The nutrient release rate of solid organic fertilizers is relatively slow. It takes a long time to degrade and decompose before it can be absorbed and utilized by plants. In addition, fertilization needs to be carried out under suitable conditions. For example, during the fertilization process, it is usually necessary to cover the organic fertilizer with soil, and it is suitable to apply fertilizer after rainfall or artificial watering after fertilization, etc., so that the solid organic fertilizer can be dissolved and absorbed and utilized by crops. However, this operation is cumbersome, increases labor costs, and has poor nutrient absorption effect, which is not conducive to the growth of crops.

[0004] Therefore, there is an urgent need to provide a composite liquid organic phosphate fertilizer to improve the saline-alkali land structure and increase crop yields. Summary of the invention

[0005] The object of the present invention is to provide a strong acidic composite liquid phosphate fertilizer capable of improving the structure of saline-alkali soil, so as to solve the problems raised in the above-mentioned background technology.

[0006] In the first aspect, the present invention provides a strongly acidic composite liquid phosphate fertilizer capable of improving the structure of saline-alkali soil, the strongly acidic composite liquid phosphate fertilizer comprising fermentation liquid, 2,5-furan dimethanol of 1.8-2.3% of the total mass of the fermentation liquid, and an acid-base regulator. The fermentation liquid is composed of a mixture of fermentation liquid A and fermentation liquid B in a mass ratio of 1:1.5.

[0007] As a preferred technical solution of the present invention, fermentation liquid A comprises the following components in parts by weight, which are obtained by primary fermentation, filtration pressing, secondary fermentation and filtration: 50-55 parts of animal feces, 40-43 parts of water, 2.5-3 parts of fermentation agent A and 1.8-2.3 parts of fermentation agent B.

[0008] As a preferred technical solution of the present invention, the fermentation liquid B includes the following components in parts by weight, which are obtained by fermentation and filtration: 35-38 parts of soybean meal, 30-33 parts of bean curd dregs, 25-28 parts of animal bones, 24-26 parts of rice bran, 20-23 parts of straw, 110-120 parts of water, and 3.5-4 parts of starter C.

[0009] As a preferred technical solution of the present invention, the acid-base regulator is composed of citric acid and malic acid in a mass ratio of 2:1.

[0010] As a preferred technical solution of the present invention, leavening agent A is composed of Penicillium, Bifidobacterium, and yeast in a mass ratio of 1:1:(0.8-1); leavening agent B is composed of Bacillus subtilis, lactic acid bacteria, and photosynthetic bacteria in a mass ratio of (1-1.2):1:1; and leavening agent C is composed of Aspergillus, lactic acid bacteria, yeast, and Bacillus subtilis in a mass ratio of (1-1.2):(1-1.2):1:1.

[0011] In a second aspect, the present invention further provides a method for preparing a strongly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure, the preparation method comprising the following steps:

[0012] S1. Place animal manure in a fermentation tank, add fermentation agent A, mix and stir evenly, ferment once, filter press, and obtain the initial fermentation liquid.

[0013] S2. Add fermentation agent B to the initial fermentation liquid, keep the initial fermentation liquid aerated, perform secondary fermentation and filtration to obtain fermentation liquid A.

[0014] S3. Crush the animal bones and straw separately, the diameter of the grinder screen is 0.6mm, and take the sieve-down; put soybean meal, bean curd dregs, rice bran, crushed animal bones and crushed straw into a fermentation tank, add water, mix and stir evenly, add fermentation agent C, mix and stir, ferment, filter, and obtain fermentation liquid B.

[0015] S4. After mixing fermentation liquid A and fermentation liquid B in proportion, add 2,5-furan dimethanol and stir evenly, then add acid-base regulator to adjust the pH value to 2.8-3.2 to obtain a strongly acidic composite liquid phosphate fertilizer.

[0016] As a preferred technical solution of the present invention, in step S1, the fermentation time is 10 to 12 days, stirring is performed every 2 days, and the temperature of the fermentation tank is controlled not to be higher than 45°C.

[0017] As a preferred technical solution of the present invention, in step S2, the secondary fermentation time is 4 to 6 days, and stirring is performed every 24 hours.

[0018] As a preferred technical solution of the present invention, in step S3, the fermentation time is 12 to 14 days, stirring is performed every 2 days, and the temperature of the fermentation tank is controlled not to be higher than 45°C.

[0019] As a preferred technical solution of the present invention, the animal manure is at least one of chicken manure, pig manure and cow manure.

[0020] As a preferred technical solution of the present invention, the animal bone is at least one of pig bone, cattle bone and fish bone.

[0021] As a preferred technical solution of the present invention, the straw is at least one of rice straw, wheat straw and corn straw.

[0022] As a preferred technical solution of the present invention, ventilation is to use a fan to ventilate the first fermentation liquid, and the ventilation flow rate is 85-100m 3 / h, ventilation frequency is 4 to 5 times / h.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses Penicillium, Bifidobacterium, and yeast to ferment animal feces once, converting organic matter such as starch, cellulose, and hemicellulose in animal feces into small molecules that are more easily absorbed by crops, while inhibiting the growth of harmful bacteria in feces, improving the safety of composite liquid phosphate fertilizers, accelerating the decomposition process of animal feces, and shortening the fermentation cycle. The fermentation liquid obtained by the primary fermentation is added to Bacillus subtilis, lactic acid bacteria, and photosynthetic bacteria for secondary fermentation, which can further ferment and decompose organic matter, improve the incomplete fermentation of organic macromolecules, reduce the stench in the fermentation liquid, and increase the content of nitrogen, phosphorus, potassium, and medium and trace elements in the fermentation liquid, thereby improving the nutritional value of the fermentation liquid. The present invention uses different fermentation strains to ferment animal feces twice, improve fermentation efficiency, enhance the nutritional value of the fermentation liquid, and reduce stench; at the same time, during the secondary fermentation process, the fermentation liquid is ventilated to increase the dissolved oxygen content in the fermentation liquid, promote the growth and metabolic activity of microorganisms in the starter, and make the microorganisms more effective in decomposing organic matter, further improve the nutrition of the fermentation liquid and reduce the stench. Aspergillus, lactic acid bacteria, yeast, and Bacillus subtilis can secrete a variety of enzymes such as protease, amylase, cellulase, etc., which can decompose the protein, starch, cellulose, etc. in soybean meal, tofu dregs, rice bran, animal bones, and straw raw materials into small molecules such as glucose, polypeptides, and amino acids, thereby increasing the content of nutrient elements in compound liquid phosphate fertilizers. At the same time, the fermentation of lactic acid bacteria can lower the pH value and inhibit the growth of harmful microorganisms.

[0025] 2. The present invention adds 2,5-furan dimethanol in the process of making composite liquid phosphate fertilizer. The hydroxyl functional group in the 2,5-furan dimethanol molecule can form hydrogen bonds with phosphate ions, carboxylate ions, amino groups, carboxyl groups, etc. in the composite liquid phosphate fertilizer to construct a stable cross-linked structure, slow down the release rate of nutrients in the composite liquid phosphate fertilizer, and slowly release the nutrients to crops in the soil, thereby promoting the stable and healthy growth of crops. At the same time, 2,5-furan dimethanol can also form a physical barrier, wrapped around the composite liquid phosphate fertilizer droplets, reduce the direct contact probability between nutrients and soil, and slow down the release rate of nutrients. Furthermore, 2,5-furan dimethanol can regulate the enzyme activity level in crops by affecting the synthesis or signal transduction of crop hormones, thereby regulating the growth and development of plants, promoting the growth of crops, and increasing crop yields.

[0026] 3. The present invention uses different fermentation strains to ferment and filter animal feces, soybean meal, bean curd residue, rice bran, animal bones, and straw, and then adds 2,5-furan dimethanol and acid-base regulators to prepare a strong acid composite liquid phosphate fertilizer. The microorganisms and organic matter in the composite liquid phosphate fertilizer can improve the structure of saline-alkali land, improve the air permeability and water retention capacity of the soil, and at the same time, the nutrients and microorganisms in the composite liquid phosphate fertilizer can promote the growth and development of crops and improve the yield and quality of crops.

[0027] 4. The present invention utilizes the composite liquid organic phosphorus fertilizer produced by fermentation technology, and the nutrients in the organic matter exist in the liquid organic fertilizer in the form of ions. Through spraying or drip irrigation, the nutrients in the liquid organic phosphorus fertilizer are more easily absorbed and utilized by plant roots, which helps crops to obtain the required nutrients faster and easier, thereby promoting better and faster growth of crops and increasing crop yields. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a flow chart for preparing the composite liquid phosphate fertilizer;

[0029] Figure 2 It is the wheat yield bar chart of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in 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.

[0031] like Figure 1As shown, the preparation method of a strongly acidic composite liquid phosphate fertilizer capable of improving the structure of saline-alkali soil provided in the embodiment of the present application comprises the following steps: S1. Place animal feces in a fermentation tank, add fermentation agent A, mix and stir evenly, ferment once, filter press, and obtain the initial fermentation liquid. S2. Add fermentation agent B to the initial fermentation liquid, keep the initial fermentation liquid ventilated, ferment twice, filter, and obtain fermentation liquid A. S3. Crush the animal bones and straw separately, the diameter of the crusher screen is 0.6mm, and take the sieve; place soybean meal, bean curd residue, rice bran, crushed animal bones, and crushed straw in a fermentation tank, add water, mix and stir evenly, add fermentation agent C, mix and stir, ferment, filter, and obtain fermentation liquid B. S4. After mixing the fermentation liquid A and the fermentation liquid B in proportion, add 2,5-furan dimethanol and stir evenly, and then add an acid-base regulator to adjust the pH value to 2.8-3.2 to obtain a strongly acidic composite liquid phosphate fertilizer.

[0032] The present invention uses Penicillium, Bifidobacterium and yeast to ferment animal feces, and converts organic substances such as starch, cellulose, hemicellulose and the like in the animal feces into small molecular substances such as nitrogen, phosphorus and potassium that are more easily absorbed and utilized by crops. Bifidobacterium can inhibit the growth of harmful bacteria in animal feces, reduce the content of pathogenic bacteria in the composite liquid phosphate fertilizer, and improve the safety of the composite liquid fertilizer. The yeast generates heat and carbon dioxide during the fermentation process, which helps to promote the maturity and decomposition of animal feces, accelerate the decomposition process of feces, and shorten the fermentation cycle.

[0033] The present invention adds Bacillus subtilis, lactic acid bacteria, and photosynthetic bacteria to the fermentation liquid obtained by the primary fermentation for secondary fermentation, which can further ferment and decompose organic matter, improve the incomplete fermentation of organic macromolecules, reduce the stench in the fermentation liquid, increase the content of nitrogen, phosphorus, potassium, and medium and trace elements in the fermentation liquid, and thus improve the nutritional value of the fermentation liquid. At the same time, during the secondary fermentation process, the fermentation liquid is ventilated to increase the dissolved oxygen content in the fermentation liquid, promote the growth and metabolic activity of microorganisms in the fermentation agent, and make the microorganisms more effective in decomposing organic matter, further improve the nutrition of the fermentation liquid and reduce the stench. The present invention uses different fermentation strains to ferment animal feces twice, improve fermentation efficiency, enhance the nutritional value of the fermentation liquid, and reduce the stench.

[0034] Aspergillus, lactic acid bacteria, yeast and Bacillus subtilis are used to ferment soybean meal, bean curd dregs, rice bran, animal bones and straw. Aspergillus and Bacillus subtilis can secrete a variety of enzymes such as protease, amylase and cellulase, thereby decomposing the protein, starch, cellulose and other raw materials in soybean meal, bean curd dregs, rice bran, animal bones and straw, producing small molecules such as glucose, polypeptide and amino acid, and increasing the content of nutrients in the compound liquid fertilizer. At the same time, the fermentation of lactic acid bacteria can lower the pH value and inhibit the growth of harmful microorganisms.

[0035] 2,5-furan dimethanol contains two hydroxyl (-OH) functional groups. The hydroxyl functional groups in its molecules can form hydrogen bonds with phosphate ions, carboxylate ions, amino groups, carboxyl groups, etc. in the composite liquid phosphate fertilizer, thereby constructing a stable cross-linked structure. This cross-linked structure can slow down the release rate of nutrients in the composite liquid phosphate fertilizer, allowing nutrients to be slowly released to crops in the soil, promoting stable and healthy growth of crops. At the same time, 2,5-furan dimethanol can also form a physical barrier wrapped around the droplets of composite liquid phosphate fertilizer. This barrier can reduce the probability of direct contact between nutrients and soil and slow down the release rate of nutrients. Furthermore, 2,5-furan dimethanol can regulate the enzyme activity level in crops by affecting the synthesis or signal transduction of crop hormones, thereby regulating the growth and development of plants, promoting the growth of crops, and increasing crop yields.

[0036] In the process of making compound liquid phosphate fertilizer, citric acid and malic acid are added to adjust the pH value of liquid phosphate fertilizer to 2.8-3.2, which effectively reduces the pH value of saline-alkali land, improves the structure of saline-alkali land, increases the emergence rate and survival rate of crops, and promotes the increase of crop yield and income. At the same time, citric acid and malic acid can form chelates with some minerals in the soil, increase the solubility of liquid phosphate fertilizer nutrients, and thus promote the absorption of nutrients by the root system.

[0037] The invention is to ferment animal feces twice, filter the obtained fermentation liquid A, mix it with soybean meal, bean curd residue, animal bones, rice bran, straw, ferment the obtained fermentation liquid B, and then add 2,5-furan dimethanol and acid-base regulator to prepare a strong acid composite liquid phosphate fertilizer. The microorganisms and organic matter in the composite liquid phosphate fertilizer can improve the structure of saline-alkali land, improve the soil microenvironment, improve the soil permeability, granulation ability and water retention ability, facilitate the growth of probiotics in the soil, promote the growth and development of crops, and improve the yield and quality of crops.

[0038] The composite liquid organic phosphorus fertilizer produced by the present invention adopts fermentation technology, which can dissolve the nutrients in organic matter in water, so that the nutrients exist in the liquid organic fertilizer in the form of ions, so that the nutrients in the liquid organic fertilizer are more easily absorbed and utilized by plant roots, which helps crops to obtain required nutrients faster and easier, thereby promoting better and faster growth of crops and increasing crop yields.

[0039] The raw materials used in the present invention are all commercially available raw materials.

[0040] Embodiment 1:

[0041] A highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure comprises fermentation liquid (fermentation liquid A and fermentation liquid B are mixed in a mass ratio of 1:1.5), 2,5-furan dimethanol accounting for 1.8% of the total mass of the fermentation liquid, and an acid-base regulator (composed of citric acid and malic acid in a mass ratio of 2:1).

[0042] Fermentation liquid A includes the following components in parts by weight, which are obtained by primary fermentation, filtration, secondary fermentation and filtration: 50 parts of animal manure (chicken manure and pig manure in a mass ratio of 1:4), 40 parts of water, 2.5 parts of fermentation agent A (Penicillium, Bifidobacterium, and yeast in a mass ratio of 1:1:0.8), and 1.8 parts of fermentation agent B (Bacillus subtilis, lactic acid bacteria, and photosynthetic bacteria in a mass ratio of 1:1:1).

[0043] Fermentation liquid B includes the following components in parts by weight, which are obtained by fermentation and filtration: 35 parts of soybean meal, 30 parts of tofu dregs, 25 parts of animal bones (pork bones and fish bones in a mass ratio of 3:1), 24 parts of rice bran, 20 parts of straw (rice straw and wheat straw in a mass ratio of 2:1), 110 parts of water, and 3.5 parts of starter C (Aspergillus, lactic acid bacteria, yeast, and Bacillus subtilis in a mass ratio of 1:1:1:1).

[0044] A method for preparing a strongly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure comprises the following steps:

[0045] S1. Place animal manure in a fermentation tank, add fermentation agent A, mix and stir evenly, ferment once, filter press, and obtain the initial fermentation liquid. The fermentation time is 10 days, stir every 2 days, and control the temperature of the fermentation tank not higher than 45°C.

[0046] S2. Add fermentation agent B to the initial fermentation liquid, keep the initial fermentation liquid ventilated, perform secondary fermentation and filtration to obtain fermentation liquid A. The secondary fermentation time is 4 days, stirring once every 24 hours, and the ventilation flow rate is 100m 3 / h, ventilation frequency is 4 times / h.

[0047] S3. Crush the animal bones and straw separately, the diameter of the grinder screen is 0.6mm, and take the sieve material; put the soybean meal, bean curd dregs, rice bran, crushed animal bones and crushed straw into a fermentation tank, add water, mix and stir evenly, add the fermentation agent C and mix and stir, ferment and filter to obtain fermentation liquid B, the fermentation time is 12 days, stir every 2 days, and control the temperature of the fermentation tank not higher than 45°C.

[0048] S4. After mixing fermentation liquid A and fermentation liquid B in proportion, add 2,5-furan dimethanol and stir evenly, then add an acid-base regulator to adjust the pH value to 2.8 to obtain a strongly acidic composite liquid phosphate fertilizer.

[0049] Embodiment 2:

[0050] A highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure comprises fermentation liquid (fermentation liquid A and fermentation liquid B are mixed in a mass ratio of 1:1.5), 2,5-furan dimethanol accounting for 2.3% of the total mass of the fermentation liquid, and an acid-base regulator (composed of citric acid and malic acid in a mass ratio of 2:1).

[0051] Fermentation liquid A includes the following components in parts by weight, which are obtained by primary fermentation, filtration pressing, secondary fermentation and filtration: 55 parts of animal manure (chicken manure, pig manure and cow manure in a mass ratio of 1:3:2), 43 parts of water, 3 parts of fermentation agent A (Penicillium, Bifidobacterium and yeast in a mass ratio of 1:1:1), and 2.3 parts of fermentation agent B (Bacillus subtilis, lactic acid bacteria and photosynthetic bacteria in a mass ratio of 1.2:1:1).

[0052] Fermentation liquid B includes the following components in parts by weight, which are obtained by fermentation and filtration: 38 parts of soybean meal, 33 parts of bean curd dregs, 28 parts of animal bones (pork bones, cattle bones, fish bones in a mass ratio of 2:2:1), 26 parts of rice bran, 23 parts of straw (rice straw, wheat straw, corn straw in a mass ratio of 2:1:2), 120 parts of water, and 4 parts of starter C (Aspergillus, lactic acid bacteria, yeast, Bacillus subtilis in a mass ratio of 1.2:1.2:1:1).

[0053] A method for preparing a strongly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure comprises the following steps:

[0054] S1. Place animal manure in a fermentation tank, add fermentation agent A, mix and stir evenly, ferment once, filter press, and obtain the initial fermentation liquid. The fermentation time is 12 days, stir every 2 days, and control the temperature of the fermentation tank not higher than 45°C.

[0055] S2. Add fermentation agent B to the initial fermentation liquid, keep the initial fermentation liquid aerated, perform secondary fermentation and filtration to obtain fermentation liquid A. The secondary fermentation time is 6 days, stirring once every 24 hours, and the ventilation flow rate is 85m 3 / h, ventilation frequency is 5 times / h.

[0056] S3. Crush the animal bones and straw separately, the diameter of the grinder screen is 0.6mm, and take the sieve material; put the soybean meal, bean curd dregs, rice bran, crushed animal bones and crushed straw into a fermentation tank, add water, mix and stir evenly, add the fermentation agent C, mix and stir, ferment and filter to obtain fermentation liquid B, the fermentation time is 14 days, stir every 2 days, and control the temperature of the fermentation tank not higher than 45°C.

[0057] S4. After mixing fermentation liquid A and fermentation liquid B in proportion, add 2,5-furan dimethanol and stir evenly, then add acid-base regulator to adjust the pH value to 3.2 to obtain a strongly acidic composite liquid phosphate fertilizer.

[0058] Comparative Example 1:

[0059] The difference from Example 1 is that no secondary fermentation is performed during the preparation of fermentation liquid A, and the initial fermentation liquid after pressure filtration is directly mixed with fermentation liquid B to obtain the fermentation liquid.

[0060] Comparative Example 2:

[0061] The difference from the first embodiment is that no ventilation treatment is performed during the secondary fermentation process.

[0062] Comparative Example 3:

[0063] The difference from Example 1 is that 2,5-furan dimethanol is not added.

[0064] Comparative Example 4:

[0065] The difference from the first embodiment is that no acid-base regulator is added.

[0066] The contents of nitrogen, phosphorus, potassium, calcium, magnesium and iron in the composite liquid phosphate fertilizers prepared in Examples 1 and 2 and Comparative Examples 1, 2, 3 and 4 were determined by liquid chromatography. The results are shown in Table 1.

[0067] Table 1: Nutrient content of compound liquid phosphate fertilizer

[0068]

[0069] As shown in Table 1, the contents of nitrogen, phosphorus, potassium, calcium, magnesium and iron in the composite liquid phosphate fertilizers prepared in Example 1 and Example 2 are relatively high, the contents of nitrogen, phosphorus, potassium, calcium, magnesium and iron in the composite liquid phosphate fertilizers prepared in Comparative Example 1 and Comparative Example 2 are relatively low, and the contents of nitrogen, phosphorus, potassium, calcium, magnesium and iron in the composite liquid phosphate fertilizers prepared in Comparative Example 3 and Comparative Example 4 are not significantly different from those in the embodiments. The composite liquid phosphate fertilizer prepared in Comparative Example 1 has a relatively obvious odor, while the composite liquid phosphate fertilizer prepared in Comparative Example 2 has a slight odor.

[0070] It can be seen that the fermentation liquid obtained from the first fermentation is added with Bacillus subtilis, lactic acid bacteria, and photosynthetic bacteria for secondary fermentation, which can further ferment and decompose organic matter, improve the incomplete fermentation of organic macromolecules, reduce the malodor in the fermentation liquid, and increase the content of nitrogen, phosphorus, potassium, and medium and trace elements in the fermentation liquid. During the secondary fermentation process, the fermentation liquid is ventilated to increase the dissolved oxygen content in the fermentation liquid, promote the growth and metabolic activity of microorganisms in the starter, and enable microorganisms to decompose organic matter more effectively, further improve the nutrition of the fermentation liquid and reduce the malodor.

[0071] Saline-alkali land was selected for the performance test of the composite liquid phosphate fertilizer. Wheat was planted on the saline-alkali land. Six days after the wheat emerged from the soil, the composite liquid phosphate fertilizer prepared in Examples 1 and 2 and Comparative Examples 1, 2, 3 and 4 was sprayed on the wheat for fertilization. The fertilizer application rate was 35 to 40 kg per mu of wheat. Three parallel experiments were selected for each group of Examples and Comparative Examples to determine the wheat yield. The control group 1 was sprayed with commercially available ordinary liquid organic fertilizer, the control group 2 was sprayed with commercially available ordinary solid organic fertilizer (after fertilization, soil was used to cover the surface of the solid organic fertilizer), and the blank group was a group without fertilization. The pH value and organic matter content of the soil were measured 6 days after fertilization.

[0072] The pH value and organic matter content of the soil 6 days after fertilization are shown in Table 2. The initial pH value is the soil pH value measured before fertilization, and the initial organic matter is the soil organic matter measured before fertilization. NY / T 1121.6-2006 "Soil Testing" was used to detect the organic matter content in the soil.

[0073] Table 2: Soil pH and organic matter content

[0074]

[0075] As shown in Table 2, the initial pH values ​​of the soils in the embodiments, comparative examples, control group and blank group were all alkaline, with a pH value of more than 8. After 6 days of fertilization, the pH values ​​of the soils in the embodiments 1 and 2 and comparative examples 1, 2, 3 and 4 dropped to 7.02, 7.11, 7.15, 7.28, 7.22 and 7.82, respectively, and the pH values ​​of the soils in the control group 1, control group 2 and blank group were 8.02, 8.10 and 8.21, respectively.

[0076] After fertilizing wheat with the composite liquid phosphate fertilizers prepared in Examples 1, 2 and Comparative Examples 1, 2, 3 and 4 for 6 days, the soil organic matter content increased by 23.0%, 24.7%, 17.4%, 20.5%, 21.9% and 10.5%, respectively; the organic matter content of the control group 1 and the control group 2 increased by 6.6% and 2.0%, and the organic matter content of the blank group decreased by 10.2%.

[0077] The blank group was not sprayed with organic fertilizer, and the organic matter in the soil was absorbed by crops, resulting in a decrease in organic matter content. The control group 2 was solid organic fertilizer. After fertilization for 6 days, the organic matter content in the soil was low, and the organic matter in the solid was not easy to dissolve. The composite liquid phosphate fertilizer made by the present invention can improve the soil microenvironment, reduce the soil pH value, improve the structure of saline-alkali land, increase soil permeability and organic matter content, and the nutrients of the liquid organic fertilizer are more easily absorbed and utilized by plant roots, thereby promoting the growth and development of crops.

[0078] Wheat yield results are shown in Figure 2As shown, the wheat yields of Example 1, Example 2, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Control Group 1, Control Group 2 and Blank Group were 563.8kg / mu, 576.3kg / mu, 540.2kg / mu, 548.3kg / mu, 498.6kg / mu, 482.5kg / mu, 462.8kg / mu, 431.7kg / mu and 412.7kg / mu respectively, and the wheat yields of Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Control Group 1, Control Group 2 and Blank Group were 4.2%, 2.7%, 11.6%, 14.4%, 17.9%, 23.4% and 26.8% lower than those of Example 1 respectively.

[0079] It can be seen that the hydroxyl functional group in the 2,5-furan dimethanol molecule can form hydrogen bonds with phosphate ions, carboxylate ions, amino groups, carboxyl groups, etc. in the composite liquid phosphate fertilizer to construct a stable cross-linked structure, which can slow down the release rate of nutrients in the composite liquid phosphate fertilizer, so that nutrients are slowly released to crops in the soil, and promote the stable and healthy growth of crops. At the same time, 2,5-furan dimethanol can regulate the enzyme activity level in crops by affecting the synthesis or signal transduction of crop hormones, thereby regulating the growth and development of plants, promoting the growth of crops, and increasing crop yields. The nutrients in the composite liquid phosphate fertilizer exist in the liquid organic fertilizer in the form of ions, so that the nutrients in the liquid organic fertilizer are more easily absorbed and utilized by the plant roots. The microorganisms and organic matter in the composite liquid organic phosphate fertilizer can improve the structure of saline-alkali land, improve the soil microenvironment, improve the soil permeability, granulation ability and water retention capacity, facilitate the growth of probiotics in the soil, promote the growth and development of crops, and improve the yield and quality of crops.

[0080] In summary, the strongly acidic composite liquid phosphate fertilizer produced by the present invention can effectively reduce the pH value of saline-alkali land, improve the structure of saline-alkali land, improve the soil microenvironment, increase the emergence rate and survival rate of crops, promote the growth and development of crops, and increase the yield and quality of crops.

[0081] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure, characterized in that: The strong acid composite liquid phosphate fertilizer comprises fermentation liquid, 2,5-furan dimethanol, and an acid-base regulator; wherein: The fermentation liquid is composed of a mixture of fermentation liquid A and fermentation liquid B in a mass ratio of 1:1.5; The fermentation liquid A comprises the following components in parts by weight, which are obtained by primary fermentation, filter pressing, secondary fermentation, and filtration: 50-55 parts of animal feces, 40-43 parts of water, 2.5-3 parts of fermentation agent A, and 1.8-2.3 parts of fermentation agent B; The fermentation liquid B comprises the following components in parts by weight, which are obtained by fermentation and filtration: 35-38 parts of soybean meal, 25-28 parts of bean curd residue and animal bones, 24-26 parts of rice bran, 20-23 parts of straw, 110-120 parts of water, and 3.5-4 parts of fermentation agent C; The amount of 2,5-furan dimethanol added is 1.8-2.3% of the total mass of the fermentation liquid; The acid-base regulator is composed of citric acid and malic acid in a mass ratio of 2:

1.

2. The highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 1, characterized in that: The fermentation agent A is composed of Penicillium, Bifidobacterium and yeast in a mass ratio of 1:1:(0.8-1); The fermentation agent B is composed of Bacillus subtilis, lactic acid bacteria, and photosynthetic bacteria in a mass ratio of (1-1.2):1:1; The fermentation agent C is composed of Aspergillus, lactic acid bacteria, yeast and Bacillus subtilis in a mass ratio of (1-1.2):(1-1.2):1:

1.

3. The highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 1, characterized in that: The preparation method of the strongly acidic composite liquid phosphate fertilizer comprises the following steps: S1. Place animal manure in a fermentation tank, add fermentation agent A, mix and stir evenly, ferment once, filter press, and obtain the initial fermentation liquid; S2. Adding fermentation agent B to the initial fermentation liquid, keeping the initial fermentation liquid aerated, secondary fermentation, filtration, to obtain fermentation liquid A; S3. The soybean meal, tofu residue, rice bran, animal bones, straw were placed in a fermentation tank, water was added, mixed and stirred, and then the fermentation agent C was added and mixed and stirred, fermented, filtered, and the fermentation liquid B was obtained; S4. After mixing fermentation liquid A and fermentation liquid B in proportion, add 2,5-furan dimethanol and stir evenly, then add acid-base regulator to adjust the pH value to 2.8-3.2 to obtain a strongly acidic composite liquid phosphate fertilizer.

4. The highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 3, characterized in that: In S1, the fermentation time is 10 to 12 days, stirring is performed every 2 days, and the temperature of the fermentation tank is controlled not to be higher than 45°C; In S2, the secondary fermentation time is 4 to 6 days, and stirring is performed every 24 hours; In S3, the fermentation time is 12 to 14 days, stirring is performed every 2 days, and the temperature of the fermentation tank is controlled not to be higher than 45°C.

5. A strongly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 1 or 3, characterized in that: The animal manure is at least one of chicken manure, pig manure and cow manure.

6. The highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 3, characterized in that: Before fermenting soybean meal, rice bran, animal bones, bean curd dregs and straw, the method further includes: crushing the animal bones and straw respectively, with the diameter of the crusher screen being 0.6 mm, and taking the sieve-down material.

7. A strongly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 1 or 3, characterized in that: The animal bones are at least one of pig bones, cattle bones and fish bones.

8. A strongly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 1 or 3, characterized in that: The straw is at least one of rice straw, wheat straw and corn straw.

9. The highly acidic composite liquid phosphate fertilizer capable of improving saline-alkali soil structure according to claim 3, characterized in that: The ventilation is to use a fan to blow air to the first fermentation liquid, and the ventilation flow rate is 85-100m 3 / h, ventilation frequency is 4 to 5 times / h.

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