Alginic acid type synergistic fertilizer and preparation method thereof

Abstract

The invention discloses an alginic acid type synergistic fertilizer and a preparation method thereof, and belongs to the technical field of soil treatment. The fertilizer is prepared from the following raw materials in parts by weight: 80 to 100 parts of alginic acid extract, 140 to 200 parts of ground phosphate rock, 5 to 10 parts of urea, 3 to 5 parts of potassium sulfate, 7 to 25 parts of magnesium carbonate, 5 to 20 parts of trace elements, 4 to 10 parts of surface cross-linking agent, 20 to 50 parts of limestone, 10 to 30 parts of straw ash, 4 to 12 parts of modified nano material, 2 to 5 parts of sodium selenite and 0.2 to 0.8 part of EM bacteria. The surface of fertilizer particles is coated with the alginic acid extract in the form of a cross-linking agent, alginic acid can be released into soil at first, plant growth is promoted, then a modified nano-material and compound bacteria are introduced into a traditional basic fertilizer, a good improvement effect on acid soil is achieved, and the soil quality is improved. The fertilizer not only can effectively improve the quality of cucumbers, but also can prevent and treat the infection of clasthosporium cucumerinum. Particularly, the modifier can well improve the pH value of the soil.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizers, and in particular relates to an alginate type synergistic fertilizer and a preparation method thereof. Background Art

[0002] Alginate fertilizer is a natural plant nutrient made from seaweed and other marine organic matter. It is rich in nutrients such as plant growth factors, trace elements and multiple amino acids. The use of alginate fertilizer can promote plant growth and increase yields. It can also enhance the plant's cold resistance, drought resistance, stress resistance, etc., and improve the soil environment.

[0003] However, excessive use of alginate fertilizer can cause soil acidity, which is one of the most common soil problems worldwide and has a negative impact on agricultural production and plant growth. In order to improve the texture and properties of acidic soil, researchers are committed to developing an alginate-based enhanced fertilizer. This article introduces a new type of soil conditioner and its preparation method, which uses modified nanomaterials and other additives to increase the pH value of acidic soil, improve soil structure and provide nutrients required by plants.

[0004] Acidic soils usually have low pH values ​​and high acidity, which leads to loose soil structure, nutrient deficiency, and limited microbial activity. These factors restrict plant growth and development, and have a negative impact on agricultural yields and sustainable land use. Therefore, how to improve soil acidity while using alginic acid to promote plant growth is an urgent problem to be solved. Summary of the invention

[0005] 1. Problems to be solved

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides an alginate-type synergistic fertilizer and a preparation method thereof. The present invention applies the alginate extract on the surface of the fertilizer particles in the form of a cross-linking agent, which can first release alginate into the soil to promote plant growth. Subsequently, modified nanomaterials and composite bacteria are introduced into the traditional basic fertilizer, which plays a good role in improving acidic soil. The above-mentioned fertilizer can not only effectively improve the quality of cucumbers, but also prevent and control the infection of cucurbitacinella. In particular, the above-mentioned modifier can well improve the pH value of the soil. pH adjustment: the pH value of acidic soil is low, and the modified nanomaterial may have the potential to adjust the pH value of the soil. By adding modified nanomaterials, the acidity of the soil can be neutralized, the pH value of the soil can be increased, and it can be closer to neutral, thereby providing an environment more suitable for plant growth. Organic matter addition: The modified nanomaterial contains organic matter components, which can provide organic matter for acidic soil, improve soil structure and water retention capacity. The addition of organic matter can increase the fertility of the soil, promote microbial activity, and improve soil texture. Nutrient supply: The modified nanomaterials may contain certain nutrients or have adsorption capacity, which can provide the nutrients required by plants and increase the soil's ability to retain nutrients. This helps improve plant growth and development. Improvement of soil water retention and permeability: The addition of modified nanomaterials may improve soil water retention, reduce water loss, and increase soil permeability. This helps improve plant water use efficiency and root aeration.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0010]

[0011] Preferably, the alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0012] Preferably, the alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0013]

[0014]

[0015] Preferably, the phosphate rock powder is in fine powder form with an apparent density of 2.8 g / cm 3 , whose parameters are as follows:

[0016] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0017] Preferably, the EM bacteria is a mixed bacteria generally including photosynthetic bacteria, yeast, lactic acid bacteria and other beneficial bacteria. It can be used for food addition, aquaculture disease prevention, soil improvement, rooting and strengthening seedlings, sewage treatment, etc. The particle size of the limestone ranges from 100um to 200um.

[0018] Preferably, the trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer, and iron fertilizer.

[0019] Preferably, the surface cross-linking agent is an aziridine cross-linking agent.

[0020] Preferably, the preparation method of the modified nanomaterial is as follows:

[0021] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, and the mixture is stirred and mixed evenly. Finally, the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0022] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0023] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0024] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0025] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance;

[0026] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0027] Preferably, the mass percentage of the phosphorus tail slurry in step (1) is 40%-55%.

[0028] 3. Beneficial effects

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention applies alginic acid extract on the surface of fertilizer particles in the form of a cross-linking agent, which can first release alginic acid into the soil to promote plant growth. Subsequently, modified nanomaterials and composite bacteria are introduced into traditional basic fertilizers, which play a good role in improving acidic soil. The above fertilizer can not only effectively improve the quality of cucumbers, but also prevent and control the infection of cucurbitacinella. In particular, the above modifier can well improve the soil pH value, pH adjustment: the pH value of acidic soil is low, and the modified nanomaterial may have the potential to adjust the soil pH value. By adding modified nanomaterials, the acidity of the soil can be neutralized, the pH value of the soil can be increased, and it is closer to neutral, thereby providing an environment more suitable for plant growth. Organic matter addition: The modified nanomaterial contains organic matter components, which can provide organic matter for acidic soil, improve soil structure and water retention capacity. The addition of organic matter can increase soil fertility, promote microbial activity, and improve soil texture. Nutrient element supply: The modified nanomaterial may contain certain nutrients or have adsorption capacity, which can provide nutrients required by plants and increase the soil's ability to retain nutrients. This helps to improve plant growth and development. Improved soil water retention and permeability: The addition of modified nanomaterials may improve soil water retention, reduce water loss, and increase soil permeability. This helps improve plant water use efficiency and root aeration. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments.

[0032] Example 1

[0033] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0034]

[0035]

[0036] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0037] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0038] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0039] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0040] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0041] The surface cross-linking agent is an aziridine cross-linking agent.

[0042] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0043] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, and the mixture is stirred and mixed evenly. Finally, the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0044] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0045] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0046] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0047] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance;

[0048] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0049] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 40%.

[0050] Example 2

[0051] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0052]

[0053] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0054] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0055] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0056] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0057] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0058] The surface cross-linking agent is an aziridine cross-linking agent.

[0059] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0060] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol and ultrasonically dispersed evenly. Finally, zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixture, and the mixture is stirred and mixed evenly. After that, the above-mentioned mixture is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0061] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0062] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0063] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0064] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance;

[0065] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0066] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 55%.

[0067] Example 3

[0068] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0069]

[0070] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0071] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0072] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0073] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0074] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0075] The surface cross-linking agent is an aziridine cross-linking agent.

[0076] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0077] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. First, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, and the mixture is stirred and mixed evenly. Finally, the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0078] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0079] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0080] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0081] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance;

[0082] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0083] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 55%.

[0084] Example 4

[0085] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0086]

[0087] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0088] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0089] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0090] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0091] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0092] The surface cross-linking agent is an aziridine cross-linking agent.

[0093] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0094] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, stirred and mixed evenly, and then the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0095] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0096] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0097] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0098] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance;

[0099] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0100] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 50%.

[0101] Example 5

[0102] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0103]

[0104]

[0105] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0106] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0107] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0108] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0109] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0110] The surface cross-linking agent is an aziridine cross-linking agent.

[0111] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0112] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, stirred and mixed evenly, and then the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0113] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0114] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0115] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0116] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance;

[0117] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0118] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 47%.

[0119] Comparative Example 1

[0120] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0121]

[0122] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0123] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0124] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0125] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0126] The surface cross-linking agent is an aziridine cross-linking agent.

[0127] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0128] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, stirred and mixed evenly, and then the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0129] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0130] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0131] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0132] (3) The mud cake obtained in step (2) is mixed with straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulation device to obtain a granular substance;

[0133] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0134] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 47%.

[0135] Comparative Example 2

[0136] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0137]

[0138] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0139] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0140] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0141] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0142] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0143] The surface cross-linking agent is an aziridine cross-linking agent.

[0144] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0145] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, stirred and mixed evenly, and then the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

[0146] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0147] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0148] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0149] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, and sodium selenite, and mixed in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulation device to obtain a granular substance;

[0150] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0151] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 47%.

[0152] Comparative Example 3

[0153] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0154]

[0155] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0156] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0157] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0158] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0159] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0160] The surface cross-linking agent is an aziridine cross-linking agent.

[0161] The alginate-based synergistic fertilizer and the preparation method of the modified nanomaterial are as follows:

[0162] First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is taken and ultrasonically crushed to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C.

[0163] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0164] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0165] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0166] (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance;

[0167] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0168] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 47%.

[0169] Comparative Example 4

[0170] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0171]

[0172]

[0173] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0174] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0175] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0176] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0177] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0178] The surface cross-linking agent is an aziridine cross-linking agent.

[0179] The alginate type synergistic fertilizer, the nano material is carbon nano tube.

[0180] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0181] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0182] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0183] (3) adding potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, nanomaterials, urea, sodium selenite, and EM bacteria to the mud cake obtained in step (2), mixing and proportioning the mixture in a mixing box, then ultrafine grinding the mixture with an ultrafine grinder, and finally stirring the mixture with a high-speed stirrer to make the mixture uniform, and adding the mixed raw materials to a granulating device to obtain a granular substance;

[0184] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0185] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 47%.

[0186] Comparative Example 5

[0187] An alginate-based synergistic fertilizer comprises the following raw materials in parts by weight:

[0188]

[0189]

[0190] The alginate type synergistic fertilizer, the phosphate rock powder is in fine powder form, and the apparent density is 2.8g / cm 3 , whose parameters are as follows:

[0191] The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

[0192] The alginate-type synergistic fertilizer has a particle size range of 100um-200um.

[0193] The EM bacteria are a composite flora, mainly including photosynthetic flora, lactic acid bacteria flora and yeast flora.

[0194] The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

[0195] The surface cross-linking agent is an aziridine cross-linking agent.

[0196] A method for preparing an alginate-based synergistic fertilizer comprises the following steps:

[0197] (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry;

[0198] (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake;

[0199] (3) adding potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, urea, sodium selenite, and EM bacteria to the mud cake obtained in step (2), mixing and proportioning the mixture in a mixing box, then ultrafine grinding the mixture with an ultrafine grinder, and finally stirring the mixture with a high-speed stirrer to make the mixture uniform, and adding the mixed raw materials to a granulating device to obtain a granular substance;

[0200] (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

[0201] In the method for preparing alginate-type synergistic fertilizer, the mass percentage of the phosphorus tail slurry in step (1) is 47%.

[0202] Example 6

[0203] The alginic acid-based synergistic fertilizers prepared in Examples 1-5 and the alginic acid-based synergistic fertilizers prepared in Comparative Examples 1-5 were selected and the following tests were performed:

[0204] The specific test method is as follows: a cucumber test site in Hefei, Anhui Province (acid pH value of 5.2) was selected, and healthy cucumber vines (in the early flowering stage, cucumber seeds were purchased from Tianjin Deruite Seed Co., Ltd., variety "Open-field Cucumber Seeds-Deruite 10") were transplanted and then the above-mentioned alginate-type synergistic fertilizer was applied (50 kg of alginate-type synergistic fertilizer per mu of acidic soil, and 10 kg of urea per mu was applied as topdressing in the later period). Subsequently, an infection test of Coryneformis was carried out during the fruiting period of the cucumber vines to observe the cucumber traits and determine the quality of the cucumbers.

[0205] Table 1 Test report

[0206]

[0207] The test shows (combined with Table 1), compared with comparative examples 1-5, the single plant yield (ranging from 7.9kg to 8.8kg) in Examples 1-5 is higher, the average fruit setting rate (ranging from 89% to 95%) is higher, the average infection rate (ranging from 4.5% to 5.2%) is lower, and the soil pH value (6.6-6.8) is restored to normal. It can be seen that the fertilizers prepared in Examples 1-5 can effectively improve the quality of cucumbers and prevent and control the infection of cucurbitacinella; among them, the fertilizer prepared in Example 5 has relatively large significant differences in various indicators.

[0208] In summary, the present invention applies alginic acid extract on the surface of fertilizer particles in the form of a cross-linking agent, which can first release alginic acid into the soil to promote plant growth. Subsequently, modified nanomaterials and composite bacteria are introduced into traditional basic fertilizers, which play a good role in improving acidic soil. The above fertilizer can not only effectively improve the quality of cucumbers, but also prevent and control the infection of melon stick spore mold. In particular, the above modifier can well improve the soil pH value, pH adjustment: the pH value of acidic soil is low, and the modified nanomaterial may have the potential to adjust the soil pH value. By adding modified nanomaterials, the acidity of the soil can be neutralized, the pH value of the soil can be increased, and it is closer to neutral, thereby providing an environment more suitable for plant growth. Organic matter addition: The modified nanomaterial contains organic matter components, which can provide organic matter for acidic soil, improve soil structure and water retention capacity. The addition of organic matter can increase the fertility of the soil, promote microbial activity, and improve soil texture. Nutrient element supply: The modified nanomaterial may contain certain nutrients or have adsorption capacity, which can provide the nutrients required by plants and increase the soil's ability to retain nutrients. This helps improve plant growth and development. Improved soil water retention and permeability: The addition of modified nanomaterials may improve soil water retention, reduce water loss, and increase soil permeability. This helps improve plant water use efficiency and root aeration.

[0209] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0210] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An alginate-based synergistic fertilizer, characterized in that: In parts by weight, the following raw materials are included:

2. The alginic acid-based synergistic fertilizer according to claim 1, characterized in that: In parts by weight, the following raw materials are included:

3. The alginic acid-based synergistic fertilizer according to claim 1, characterized in that: In parts by weight, the following raw materials are included:

4. The alginic acid-based synergistic fertilizer according to claim 1, characterized in that: The phosphate rock powder is in fine powder form with an apparent density of 2.8 g / cm 3 , whose parameters are as follows: The calcium phosphate content is 45.6%, the aluminum phosphate content is 18.2%, the magnesium phosphate content is 17.5%, the iron phosphate content is 4.79%, the phosphorus pentoxide content is 12.51%, and the remainder is impurities; the alginate extract contains seaweed polysaccharides, alginate, fucoidan, fucoxanthin, kelp starch, etc., wherein the particle size is 80-120 mesh, and the alginate content is ≥100g / L.

5. The alginic acid-based synergistic fertilizer according to claim 1, characterized in that: The EM bacteria is a mixed bacteria generally including photosynthetic bacteria, yeast, lactic acid bacteria and other beneficial bacteria. It can be used for food additives, aquaculture disease prevention and control, soil improvement, rooting and seedling strengthening, sewage treatment, etc. The particle size range of the limestone is 100um-200um.

6. The alginic acid-based synergistic fertilizer according to claim 1, characterized in that: The trace elements are molybdenum fertilizer, boron fertilizer, manganese fertilizer, zinc fertilizer, copper fertilizer and iron fertilizer.

7. The alginic acid-based synergistic fertilizer according to claim 1, characterized in that: The surface cross-linking agent is an aziridine cross-linking agent.

8. The alginic acid-based synergistic fertilizer according to claim 3, characterized in that: The preparation method of the modified nanomaterial is as follows: First, the carbon nanotubes are immersed in eighty times the mass of concentrated nitric acid for oxidation reaction. After the reaction is completed, the carbon nanotubes are centrifuged at 10,000 rpm. The precipitate is crushed by ultrasound to disperse the carbon nanotubes in the solution. The reaction is carried out at 65°C for 8 hours under stirring conditions. After the reaction is completed, the carbon nanotubes are centrifuged at 12,000 rpm, washed with deionized water, and dried at 50°C to obtain modified carbon nanotubes. Then, the modified carbon nanotubes are dispersed in one hundred times the mass of ethanol, ultrasonically dispersed evenly, and then zinc carbonate and potassium humate are added to the above-mentioned uniformly dispersed modified carbon nanotube mixed solution, and the mixture is stirred and mixed evenly. Finally, the above-mentioned mixed solution is hydrothermally reacted at 180°C for 6 hours. After the reaction is completed, the product is centrifuged at 6,000 rpm, washed with deionized water, and dried at 80°C to obtain modified nanomaterials.

9. A method for preparing an alginate-based synergistic fertilizer, comprising the following steps: (1) slurrying phosphate rock powder through a slurry generator to obtain phosphorus tail slurry; (2) passing the phosphorus tail slurry obtained in step (1) through a filter press to obtain a mud cake; (3) The mud cake obtained in step (2) is mixed with potassium sulfate, magnesium carbonate, trace elements, limestone, straw ash, modified nanomaterials, urea, sodium selenite, and EM bacteria, mixed and proportioned in a mixing box, then ultrafinely crushed with an ultrafine grinder, and finally stirred with a high-speed stirrer to make the ingredients uniform, and the mixed raw materials are added to a granulating device to obtain a granular substance; (4) Mixing the alginic acid extract with a surface cross-linking agent, and spraying the mixture evenly on the surface of the granular material in step (3) by using a spraying device, and obtaining a granular alginic acid-based synergistic fertilizer after solidification.

10. The method for preparing an alginate-based synergistic fertilizer according to claim 9, characterized in that: The mass percentage of the phosphorus tail slurry in step (1) is 40%-55%.

Images