Novel compound fertilizer containing multiple elements and preparation method

Abstract

The compound fertilizer is prepared from the following raw materials in percentage by mass: 6%-8% of nitrogen, 6%-8% of phosphorus, 6%-8% of potassium, 35%-40% of organic matters, 8%-10% of medium trace elements, 8%-10% of compound amino acid and 12%-16% of compound amino acid, the EM symbiotic beneficial bacteria are formed by fermenting and compounding a plurality of beneficial bacteria with a fine molecular function and phosphorus dissolving, potassium dissolving and nitrogen fixing functions through a culture medium. By adding EM symbiotic beneficial bacteria, nitrogen, phosphorus and potassium and microorganisms are mutually promoted, so that the utilization rate of nitrogen, phosphorus and potassium is increased, insoluble phosphorus and potassium deposited in soil are converted into available phosphorus and available potassium which can be absorbed by plants, the problem of soil hardening is solved, conversion of soil organic matters can be promoted through degradation of microorganisms, and the soil quality is improved. Meanwhile, medium trace elements and various amino acids are added, so that the growth of plants is promoted, and crops can grow better.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural fertilizers, and in particular to a novel compound fertilizer containing multiple elements and a preparation method thereof. Background Art

[0002] In view of the current situation where chemical fertilizers dominate the agricultural input field, the use of chemical fertilizers has become a deep-rooted habit of the vast majority of farmers due to long-term use of chemical fertilizers and lack of scientific and reasonable management. The long-term and unrestrained abuse of chemical fertilizers has led to soil health problems such as soil compaction and salinization. The lack of microorganisms and a variety of trace elements has led to an imbalance in soil nutrition.

[0003] At present, the utilization rate of chemical fertilizers can only reach about 30%. Most of the nitrogen, phosphorus and potassium nutrients applied to the fields volatilize, while the phosphorus and potassium elements, because they are not fully utilized, are mostly deposited in the soil together with other agricultural residues, seriously threatening the health of the soil; and the straw and organic materials of the crop roots lost in the fields every year cannot be rotted in time due to the lack of microorganisms, but instead become a breeding ground for dirt, eggs and bacteria. The lack of microorganisms and trace elements in the crops has led to a serious imbalance in soil nutrition. The agricultural products have poor nutrition due to incomplete and poor absorption of nutrients, and the crops have lost their own taste. The overwhelming nutritionally unbalanced food has seriously threatened the health of the entire population. In view of this, this program proposes a new type of compound fertilizer containing multiple elements and a preparation method to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a novel compound fertilizer containing multiple elements and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a novel compound fertilizer containing multiple elements, the compound fertilizer is prepared from the following raw materials according to mass percentage, including 6% to 8% nitrogen, 6% to 8% phosphorus, 6% to 8% potassium, 35% to 40% organic matter, 8% to 10% trace elements, 8% to 10% and 12% to 16% complex amino acids;

[0006] The EM symbiotic beneficial bacteria are prepared by fermenting and compounding a plurality of beneficial bacteria species having the functions of sub-molecularization, phosphorus dissolving, potassium dissolving and nitrogen fixing through a culture medium.

[0007] Preferably, the strains of the EM symbiotic beneficial bacteria include photosynthetic bacteria, lactic acid bacteria, butyric acid bacteria, acetic acid bacteria, actinomycetes, and one or more of subtilis, jelly, lichen, laterosporea, megaterium and Bacillus amyloliquefaciens.

[0008] Preferably, the culture medium for the EM symbiotic beneficial bacteria fermentation is composed of complex amino acids, milk powder, glucose, peptone, potassium humate, monoammonium phosphate, potassium dihydrogen phosphate, molasses, seaweed extract and starch.

[0009] Preferably, the nitrogen, phosphorus and potassium elements are provided by urea, potassium chloride and monoammonium phosphate, respectively.

[0010] Preferably, the organic matter is organic waste material, including straw, mushroom residue and livestock and poultry manure.

[0011] Preferably, the trace elements include one or more of calcium, magnesium, iron, zinc, boron, silicon, manganese, sulfur, titanium, selenium, copper and molybdenum.

[0012] Preferably, the complex amino acids include one or more of glutamic acid, glycine, proline, aspartic acid, lysine, phenylalanine, threonine, valine, isoleucine and methionine.

[0013] A method for preparing a novel compound fertilizer containing multiple elements, which is used to prepare the compound fertilizer, comprises the following steps:

[0014] The first step is to turn the raw materials. First, organic matter and compound amino acids are selected as raw materials, and then the raw materials are piled up. After that, the raw material pile is regularly turned by a compost turning machine and manual labor, while maintaining ventilation to promote anaerobic fermentation and heat generation. The raw materials are piled up to a height of 1m-2m and a width of 2m-3m.

[0015] The second step is to carry out composting and fermentation, select EM symbiotic beneficial bacteria used in composting and sprinkle them into the pile, and regularly check the humidity and temperature of the pile, and regularly turn over and continue fermentation. The humidity of the pile is 40% to 60%, the temperature of the pile is 55° C. to 65° C., and the fermentation time is 28 days to 42 days;

[0016] The third step is to crush the fermented raw materials. First, the fermented raw materials are dried, and then crushed into particles by a crusher through multiple crushing.

[0017] The fourth step is to screen the raw material particles, using a sieve to screen the raw materials into particles of 2mm-5mm, and remove large particles and impurities through screening;

[0018] The fifth step is to conduct biological nutrition testing. First, samples are randomly collected from different batches of raw material particles. Then, the samples are analyzed for nitrogen, phosphorus and potassium nutrients using chemical analysis methods. Finally, the types and quantities of beneficial microorganisms in the compost are tested.

[0019] The sixth step is to add medium and trace elements, nitrogen, phosphorus and potassium. According to the test results, the corresponding medium and trace elements, nitrogen, phosphorus and potassium are selected and then mixed into the screened fertilizer particles;

[0020] The seventh step is to perform extrusion granulation, using a press granulator to granulate the mixed fertilizer. After the granulation is completed, the fertilizer granules are cooled;

[0021] The eighth step is to package the fertilizer. Use an automated packaging machine to package the fertilizer in quantitative quantities, and indicate the fertilizer's ingredients, instructions for use, and production date on the package. Store it in a dry and cool place.

[0022] Preferably, the fifth step of biological nutrition detection includes detection of nitrogen, phosphorus and potassium content, and the specific operation steps are:

[0023] A1, firstly, random sampling is carried out, and samples are randomly selected from different batches of raw material particles by "Z" shape and "W" shape sampling methods, and 3-5 samples are taken from each batch, and finally the samples are mixed to form a comprehensive sample;

[0024] A2, pre-treat the comprehensive sample, dry the collected comprehensive sample naturally at room temperature, and then use a sieve to sieve the sample to obtain 2mm particles;

[0025] A3, chemical analysis of nitrogen content, phosphorus content and potassium content in the sample is performed, wherein the nitrogen content is determined by the Kjeldahl method, the phosphorus content is determined by the molar ratio method and the sample needs to be dissolved in an acid solution, and the potassium content is determined by flame photometry;

[0026] A4, conduct sample analysis and record the results of the chemical analysis in the laboratory record sheet, including the sample number, specific content of nitrogen, phosphorus and potassium, and the date of analysis.

[0027] Preferably, the biological nutrition detection also includes beneficial microorganism detection, and the specific operation steps are:

[0028] B1, conduct microbial culture, take out fertilizer particles from the comprehensive sample, dilute them and inoculate them on the culture medium to separate and culture the beneficial microorganisms in the compost;

[0029] B2, perform cultivation adjustment settings, set the cultivation temperature to 25°C-30°C, the cultivation humidity to 70%-90%, and the cultivation time to 3-7 days;

[0030] B3, perform microbial counts, use the plate count method to count the number of colonies on the culture medium, and record the growth of various microorganisms;

[0031] B4, conduct microbial identification, identify the isolated microorganisms based on morphological characteristics, staining reactions, and physiological and biochemical characteristics, and record their types and quantities;

[0032] B5, conduct data analysis and summary, organize and analyze the contents of nitrogen, phosphorus and potassium as well as the types and quantities of microorganisms, evaluate the nutritional value and biological activity of the fertilizer, and adjust the added content of trace elements and nutrients based on the test results.

[0033] Technical effects and advantages of the present invention:

[0034] The present invention promotes the mutual growth of nitrogen, phosphorus and potassium with microorganisms by adding EM symbiotic beneficial bacteria, thereby improving the utilization rate of nitrogen, phosphorus and potassium, converting the insoluble phosphorus and potassium deposited in the soil into effective phosphorus and effective potassium that can be absorbed by plants, thereby changing the problem of soil compaction, and promoting the transformation of soil organic matter through the degradation of microorganisms. At the same time, by adding trace elements and various amino acids, the growth of plants is promoted. Therefore, the fertilizer prepared by this scheme can well improve the content of soil nutrients, thereby allowing crops to grow better. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an operation flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] Embodiment 1, the present invention provides a novel compound fertilizer containing multiple elements, which is prepared by the following raw materials according to mass percentage, including 6% to 8% nitrogen, 6% to 8% phosphorus, 6% to 8% potassium, 35% to 40% organic matter, 8% to 10% trace elements, 8% to 10% complex amino acids and 12% to 16% EM symbiotic beneficial bacteria;

[0038] EM symbiotic beneficial bacteria are made by fermenting and compounding a variety of beneficial bacteria with the functions of sub-molecularization, phosphorus solubilization, potassium solubilization and nitrogen fixation through culture medium, and the bacterial count exceeds 20 million.

[0039] Specifically, the species of EM symbiotic beneficial bacteria include photosynthetic bacteria, lactic acid bacteria, butyric acid bacteria, acetic acid bacteria, actinomycetes, and one or more of subtilis, jelly, lichen, laterospore, megaterium and Bacillus amyloliquefaciens.

[0040] It should be noted that photosynthetic bacteria: This type of bacteria can synthesize organic matter through photosynthesis and is often used for water purification and soil improvement;

[0041] Lactic acid bacteria: Lactic acid bacteria is an important fermentation bacteria, commonly used in food fermentation, which can produce lactic acid and help inhibit the growth of harmful bacteria;

[0042] Butyric acid bacteria: This bacterium can break down cellulose and starch, produce butyric acid, and help improve soil structure and fertility;

[0043] Acetic acid bacteria: Acetic acid bacteria produce acetic acid by oxidizing alcohols and are commonly used in the production of food and beverages;

[0044] Actinomycetes: Actinomycetes are widely found in the soil and have the ability to decompose organic matter and synthesize antibiotics, which helps to inhibit pathogens;

[0045] Bacillus subtilis: This bacterium promotes plant growth and enhances plant resistance to disease;

[0046] Bacillus gelatinus: has good biodegradability and can decompose organic matter;

[0047] Bacillus licheniformis: commonly found in soil and plants, it helps plant growth and soil improvement;

[0048] Bacillus laterosporus: It has the function of promoting plant growth and inhibiting pathogenic microorganisms;

[0049] Bacillus megaterium: commonly used in the production of biofertilizers, which can promote plant nutrient absorption;

[0050] Bacillus amyloliquefaciens: Good at breaking down starch and other carbohydrates, it can improve soil fertility.

[0051] Furthermore, the culture medium for the fermentation of EM symbiotic beneficial bacteria is composed of complex amino acids, milk powder, glucose, peptone, potassium humate, monoammonium phosphate, potassium dihydrogen phosphate, molasses, seaweed extract and starch.

[0052] It should be noted that the fermentation medium of EM symbiotic beneficial bacteria contains a variety of nutrients to support the growth and reproduction of microorganisms, among which:

[0053] Complex amino acids: provide essential amino acids for microorganisms to support their cell synthesis and growth;

[0054] Milk powder: rich in protein and nutrients, which can provide nutrients needed for the growth of microorganisms;

[0055] Glucose: A simple sugar that can be rapidly utilized by microorganisms as a carbon source, promoting their growth;

[0056] Peptone: Produced by protein hydrolysis, it provides amino acids and peptides to support the growth of microorganisms;

[0057] Potassium humate: organic matter that can improve soil structure and soil fertility, while also providing nutrition for microorganisms;

[0058] Monoammonium phosphate: A commonly used phosphate fertilizer that provides phosphorus and nitrogen for plant growth;

[0059] Potassium dihydrogen phosphate: provides phosphorus and potassium necessary for plant growth and promotes the development of plant roots;

[0060] Molasses: a sugar-rich byproduct that serves as an additional carbon source and helps the rapid growth of microorganisms;

[0061] Seaweed extract: rich in minerals and trace elements, which can enhance the activity and growth of microorganisms;

[0062] Starch: As a carbon source, it can be decomposed and utilized by certain microorganisms to promote their growth.

[0063] The combination of these ingredients provides a growth environment for EM microorganisms and promotes their reproduction and metabolic activities.

[0064] Specifically, nitrogen, phosphorus and potassium elements are provided by urea, potassium chloride and monoammonium phosphate, respectively.

[0065] Specifically, organic matter refers to organic waste materials, including straw, mushroom residues and livestock and poultry manure.

[0066] Specifically, the trace elements include one or more of calcium, magnesium, iron, zinc, boron, silicon, manganese, sulfur, titanium, selenium, copper and molybdenum.

[0067] Specifically, the complex amino acids include one or more of glutamic acid, glycine, proline, aspartic acid, lysine, phenylalanine, threonine, valine, isoleucine and methionine.

[0068] It should be noted that complex amino acids are a mixture of multiple amino acids to provide the amino acids required for microbial growth;

[0069] Among them, glutamate is a non-essential amino acid that participates in protein synthesis and neurotransmission; glycine is the simplest amino acid and is also a non-essential amino acid that is used to synthesize collagen; proline is a non-essential amino acid that exists in collagen and affects the structure of the protein; aspartic acid is a non-essential amino acid that participates in energy metabolism and neurotransmission; lysine is an essential amino acid that participates in protein synthesis and immune function; phenylalanine is an essential amino acid that participates in the synthesis of a variety of substances, including tyrosine and neurotransmitters; threonine is an essential amino acid that participates in protein synthesis and supports the immune system; valine is an essential amino acid that participates in muscle metabolism and energy generation; isoleucine is an essential amino acid that participates in energy production and muscle repair; methionine is an essential amino acid that participates in protein synthesis and metabolic processes.

[0070] The present invention provides Figure 1 The preparation method of a novel compound fertilizer containing multiple elements is shown, which is used to prepare the compound fertilizer of Example 1. The preparation method comprises the following steps:

[0071] The first step is to turn the raw materials. First, organic matter and compound amino acids are selected as raw materials, and then the raw materials are piled up. After that, the raw material pile is regularly turned by a compost turning machine and manual labor, while maintaining ventilation to promote anaerobic fermentation and heat generation.

[0072] Specifically, in the first step, the stacking height of the raw materials is 1m-2m, and the stacking width is 2m-3m.

[0073] It should be noted that organic matter is a mixture of straw, mushroom residue and livestock and poultry manure. During the stacking and turning process, ventilation and air permeability need to be maintained to provide nourishment for the organic matter pile.

[0074] The second step is to add bacteria to the compost and ferment it. The EM symbiotic beneficial bacteria used in composting are selected and sprinkled into the pile. At the same time, the humidity and temperature of the pile are regularly tested, and the pile is regularly turned over for continuous fermentation.

[0075] Specifically, in the second step, the humidity of the pile is 40% to 60%, the temperature of the pile is 55° C. to 65° C., and the fermentation time is 28 days to 42 days.

[0076] It should be noted that when spreading EM symbiotic beneficial bacteria, the compost pile needs to be turned to ensure that the bacteria are spread evenly and fully. At the same time, while maintaining humidity and temperature, water or ventilation can be added if necessary.

[0077] The third step is to crush the raw materials after fermentation. First, the fermented raw materials are dried, and then crushed into particles by a crusher through multiple crushing. Multiple crushing ensures uniform crushing.

[0078] The fourth step is to screen the raw material particles. The raw materials are screened into 2mm-5mm particles using a sieve, and large particles and impurities are removed by screening to ensure the purity and quality of the fertilizer.

[0079] The fifth step is to conduct biological nutrition testing. First, samples are randomly collected from different batches of raw material particles. Then, the samples are analyzed for nitrogen, phosphorus and potassium nutrients using chemical analysis methods. Finally, the types and quantities of beneficial microorganisms in the compost are tested. Chemical methods include photometry and atomic absorption spectrometry to evaluate the biological activity of the fertilizer.

[0080] Specifically, the fifth step of biological nutrition testing includes nitrogen, phosphorus and potassium content testing, and the specific operation steps are as follows:

[0081] A1, firstly, random sampling is carried out, and samples are randomly selected from different batches of raw material particles by "Z" shape and "W" shape sampling methods, and samples are uniformly taken from each batch, and 3-5 samples are taken from each batch. Finally, the samples are mixed to form a comprehensive sample;

[0082] A2, pre-treat the comprehensive samples, dry the collected comprehensive samples naturally at room temperature to remove moisture, and then use a sieve to sieve out 2mm particles from the samples. This sieving is coarse sieving to ensure that the size of the particles of the tested samples is uniform;

[0083] A3, chemical analysis of nitrogen content, phosphorus content and potassium content in the sample is performed, wherein the nitrogen content is determined by the Kjeldahl method, the phosphorus content is determined by the molar ratio method and the sample needs to be dissolved in an acid solution, and the potassium content is determined by flame photometry;

[0084] It should be noted that the determination of nitrogen content can be carried out by Kjeldahl method and microwave digestion method, among which Kjeldahl method is a classic method for determining nitrogen content, which is mainly used for the determination of nitrogen in organic matter. Its operating steps are: weigh 0.5-1g of sample and put it into a Kjeldahl nitrogen bottle; add sulfuric acid, catalyst (including any one of copper sulfate and potassium sulfate) and sodium bisulfate, mix well, put the bottle into a digestion furnace and heat until the sample is completely digested; after digestion, wait for cooling, add sodium hydroxide solution for neutralization; distill nitrogen with distilled water, collect it in an acid solution of known concentration, titrate the collected acid solution with standard sodium hydroxide solution, and calculate the nitrogen content.

[0085] The molar ratio method is a method for determining the phosphorus content in soil samples, which is suitable for determining inorganic phosphorus. The steps of determining the phosphorus content by the molar ratio method are as follows: taking a fertilizer sample, first drying, crushing and sieving it, then using sulfuric acid-hydrogen peroxide to digest it, converting organic phosphorus into inorganic phosphorus, mixing the sample with a digester, heating and digesting it until the sample is completely dissolved, during which the temperature and time are controlled to avoid sample loss, diluting the digested sample to 50 mL, adding ammonium molybdate and a reducing agent, and standing at room temperature to allow phosphorus to react with molybdate to form a blue complex, using a spectrophotometer to measure the absorbance of the sample at a specific wavelength (usually 880 nm), and preparing phosphorus standard solutions of different concentrations, drawing a standard curve, and performing quantitative analysis. According to the absorbance value of the sample, the phosphorus content in the sample is calculated in combination with the standard curve. The calculation formula is expressed as follows:

[0086] Phosphorus content = C × D (1);

[0087]

[0088] Among them, C represents the concentration of phosphorus in the sample, D represents the dilution multiple, and A s represents the absorbance of the measured sample at the same wavelength, b represents the intercept of the absorbance standard curve of the known concentration of phosphorus standard solution, and k represents the slope of the standard curve.

[0089] The potassium content can be determined by flame photometry or atomic absorption spectrometry, wherein flame photometry is a method for analysis based on the spectral characteristics of atoms after being excited in a flame, and the steps are as follows: first, the sample to be tested is treated with acid digestion to prepare a solution; then the sample solution is introduced into the flame, and propane or acetylene is used as fuel, and air is used as a combustion-supporting gas, after which the potassium element is excited in the flame to emit light of a specific wavelength, which is 766.5nm, and an instrument is used to detect the light intensity of the wavelength through spectral analysis, and finally the potassium content in the sample is calculated based on a standard curve or a sample of known concentration.

[0090] A4, conduct sample analysis and record the results of the chemical analysis in the laboratory record sheet, including the sample number, specific content of nitrogen, phosphorus and potassium, and the date of analysis.

[0091] Specifically, biological nutrition testing also includes beneficial microbial testing, and the specific operating steps are:

[0092] B1, conduct microbial culture, take out fertilizer particles from the comprehensive sample, dilute them and inoculate them on the culture medium to separate and culture the beneficial microorganisms in the compost;

[0093] It should be noted that the culture medium can be selected from nutrient agar and potato dextrose agar, which are two commonly used microbial culture media;

[0094] The ingredients of nutrient agar include agar, nutrient broth and salt, which provide necessary nutrients for microorganisms, including nitrogen source, carbon source and minerals; it is suitable for culturing a variety of bacteria and fungi, for the isolation and preliminary identification of bacteria, and is rich in nutrients, suitable for the growth of non-specific microorganisms;

[0095] Potato dextrose agar is composed of potato extract, glucose and agar. Potato extract provides nutrients, while glucose is a carbon source. It is commonly used to cultivate fungi, including molds and yeasts.

[0096] B2, perform cultivation adjustment settings, set the cultivation temperature to 25°C-30°C, the cultivation humidity to 70%-90%, and the cultivation time to 3-7 days;

[0097] B3, perform microbial counts, use the plate count method to count the number of colonies on the culture medium, and record the growth of various microorganisms;

[0098] It should be noted that the plate count method is a counting and measurement method used in statistics and biology. It is to culture and count microorganisms, cells or other biological samples by using plates (such as culture dishes). The basic steps of the plate count method usually include:

[0099] 1. Sample preparation: Take a certain amount of liquid or solid sample from the sample to be tested and dilute it to ensure that countable colonies can be formed on the culture plate;

[0100] 2. Inoculation: evenly inoculate the diluted sample onto the culture medium, and use agar plate as the culture medium;

[0101] 3. Cultivation: placing the inoculated plate under set temperature and environmental conditions for cultivation, and the specific cultivation time depends on the growth characteristics of the target microorganism;

[0102] 4. Counting: After the incubation, observe the colonies formed on the plates and count them. Only count those plates with 30 to 300 colonies to ensure the accuracy of the results.

[0103] 5. Calculation: Calculate the concentration of microorganisms in the sample based on the counting results and the dilution factor.

[0104] B4, conduct microbial identification, identify the isolated microorganisms based on morphological characteristics, staining reactions, and physiological and biochemical characteristics, and record their types and quantities;

[0105] It should be noted that microbial identification includes the following steps:

[0106] 1. Observation of morphological characteristics;

[0107] Microscopic observation, using an optical microscope to observe the morphological characteristics of microorganisms, including the shape (sphere, rod, and spiral) and arrangement (single, pair, chain, and cluster) of bacteria;

[0108] Cell size, measuring the size of cells, expressed in micrometers (μm);

[0109] Structural features: observing whether the cell has special structures, including flagella, spores, and vesicles;

[0110] 2. Staining reaction;

[0111] Gram staining, based on the structure of the bacterial cell wall, divides bacteria into Gram-positive (purple) and Gram-negative (red). Gram-positive bacteria have a thicker peptidoglycan layer, while Gram-negative bacteria have a thinner peptidoglycan layer and an outer membrane.

[0112] 3. Physiological and biochemical characteristics;

[0113] Characteristics of the culture medium: select the culture medium for cultivation and observe the characteristics of the colonies, including color, shape, edge and transparency;

[0114] 4. Biochemical reaction test;

[0115] Fermentation capacity, testing its fermentation capacity for different sugars;

[0116] enzyme activities, including oxidase, catalase, and amylase;

[0117] Gas production, whether gas is produced during the fermentation process;

[0118] Resistance testing: sensitivity to different antibiotics;

[0119] 5. Recording and identification;

[0120] Record the types and quantities. Based on the above observations and test results, record the types and quantities of identified microorganisms. This can be organized using a table or database.

[0121] B5, conduct data analysis and summary, organize and analyze the contents of nitrogen, phosphorus and potassium as well as the types and quantities of microorganisms, evaluate the nutritional value and biological activity of the fertilizer, and adjust the added content of trace elements and nutrients based on the test results.

[0122] The sixth step is to add trace elements, nitrogen, phosphorus and potassium. According to the test results, the corresponding trace elements, nitrogen, phosphorus and potassium are selected and then mixed into the sieved fertilizer particles. The additives need to be evenly mixed into the crushed fertilizer to ensure that each particle can obtain sufficient nutrition.

[0123] It should be noted that when adding medium and trace elements, nitrogen, phosphorus and potassium, the soil and plant needs are tested to determine the specific contents of the required medium and trace elements, nitrogen, phosphorus and potassium, and then they are supplemented; among them, urea and ammonium nitrate are selected for nitrogen, superphosphate and diammonium phosphate are selected for phosphorus, potassium chloride and potassium sulfate are selected for potassium, and compounds of boron, zinc, iron, manganese and copper are selected for medium and trace elements; the screened fertilizer particles are placed in a mixing device; and then the selected nitrogen, phosphorus, potassium and medium and trace element additives are gradually added according to the calculated ratio.

[0124] The seventh step is to perform extrusion granulation. Use a compression granulator to granulate the mixed fertilizer. After granulation, the fertilizer granules are cooled. The fertilizer needs to be cooled to improve the stability of the granules.

[0125] It should be noted that in the extrusion granulation process, the mixed fertilizer raw materials are first fed into the extrusion granulator, which squeezes the raw materials into granules under high pressure. After the granulation is completed, the temperature of the granules is relatively high, so they need to be cooled. The purpose of cooling is to improve the stability of the granules and prevent them from agglomerating or deteriorating during storage and transportation.

[0126] Among them, the cooling treatment can be carried out in the following ways:

[0127] Natural cooling: Spread the granulated fertilizer particles in a ventilated place and let them cool naturally;

[0128] Air cooling, using fans or air cooling equipment to blow cold air to quickly cool the particles;

[0129] Water cooling, by spraying water or placing the granules in cold water for cooling, but the water content must be controlled so as not to affect the quality of the fertilizer;

[0130] Cooling tower: Use cooling tower to cool the pellets to ensure even cooling of the pellets;

[0131] During the cooling process, it is necessary to ensure that the temperature of the particles gradually decreases to room temperature to prevent thermal stress from causing the particles to break or deform. After cooling is completed, the fertilizer particles can be subsequently packaged and stored. Through this series of processes, the quality and stability of the fertilizer can be ensured, preparing for subsequent application.

[0132] The eighth step is to package the fertilizer. Choose packaging materials with good air permeability and corrosion resistance, use an automatic packaging machine to package the fertilizer in quantitative quantities, ensure that the weight of each bag of fertilizer is consistent, and mark the fertilizer's ingredients, instructions for use and production date on the package, and store it in a dry and cool place.

[0133] It should be noted that when packaging fertilizers, the packaging materials need to be selected with good air permeability and corrosion resistance. Good air permeability can prevent the fertilizer from agglomerating due to moisture while maintaining its active ingredients. Corrosion-resistant materials include polyethylene and polypropylene materials, which are not only corrosion-resistant but also have tensile strength and toughness.

[0134] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel compound fertilizer containing multiple elements, characterized in that: The compound fertilizer is prepared from the following raw materials according to mass percentage, including 6% to 8% nitrogen, 6% to 8% phosphorus, 6% to 8% potassium, 35% to 40% organic matter, 8% to 10% trace elements, 8% to 10% compound amino acids and 12% to 16% EM symbiotic beneficial bacteria; The EM symbiotic beneficial bacteria are prepared by fermenting and compounding a plurality of beneficial bacteria species having the functions of sub-molecularization, phosphorus dissolving, potassium dissolving and nitrogen fixing through a culture medium.

2. A novel compound fertilizer containing multiple elements according to claim 1, characterized in that: The strains of the EM symbiotic beneficial bacteria include photosynthetic bacteria, lactic acid bacteria, butyric acid bacteria, acetic acid bacteria, actinomycetes, and one or more of subtilis, jelly, lichen, sporebacterium, megaterium and amyloliquefaciens.

3. A novel compound fertilizer containing multiple elements according to claim 2, characterized in that: The culture medium for the EM symbiotic beneficial bacteria fermentation is composed of composite amino acids, milk powder, glucose, peptone, potassium humate, monoammonium phosphate, potassium dihydrogen phosphate, molasses, seaweed extract and starch.

4. The novel compound fertilizer containing multiple elements according to claim 1, characterized in that: The nitrogen, phosphorus and potassium elements are provided by urea, potassium chloride and monoammonium phosphate respectively.

5. The novel multi-element compound fertilizer according to claim 1, characterized in that: The organic matter is organic waste material, including straw, mushroom residue and livestock and poultry manure.

6. The novel compound fertilizer containing multiple elements according to claim 1, characterized in that: The trace elements include one or more of calcium, magnesium, iron, zinc, boron, silicon, manganese, sulfur, titanium, selenium, copper and molybdenum.

7. The novel multi-element compound fertilizer according to claim 1, characterized in that: The complex amino acids include one or more of glutamic acid, glycine, proline, aspartic acid, lysine, phenylalanine, threonine, valine, isoleucine and methionine.

8. A method for preparing a novel compound fertilizer containing multiple elements, used for preparing the compound fertilizer according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: The first step is to turn the raw materials. First, organic matter and compound amino acids are selected as raw materials, and then the raw materials are piled up. After that, the raw material pile is regularly turned by a compost turning machine and manual labor, while maintaining ventilation to promote anaerobic fermentation and heat generation. The raw materials are piled up to a height of 1m-2m and a width of 2m-3m. The second step is to carry out composting and fermentation, select EM symbiotic beneficial bacteria used in composting and sprinkle them into the pile, and regularly check the humidity and temperature of the pile, and regularly turn over and continue fermentation. The humidity of the pile is 40% to 60%, the temperature of the pile is 55° C. to 65° C., and the fermentation time is 28 days to 42 days; The third step is to crush the fermented raw materials. First, the fermented raw materials are dried, and then crushed into particles by a crusher through multiple crushing. The fourth step is to screen the raw material particles, using a sieve to screen the raw materials into particles of 2mm-5mm, and remove large particles and impurities through screening; The fifth step is to conduct biological nutrition testing. First, samples are randomly collected from different batches of raw material particles. Then, the samples are analyzed for nitrogen, phosphorus and potassium nutrients using chemical analysis methods. Finally, the types and quantities of beneficial microorganisms in the compost are tested. The sixth step is to add medium and trace elements, nitrogen, phosphorus and potassium. According to the test results, the corresponding medium and trace elements, nitrogen, phosphorus and potassium are selected and then mixed into the screened fertilizer particles; The seventh step is to perform extrusion granulation, using a press granulator to granulate the mixed fertilizer. After the granulation is completed, the fertilizer granules are cooled; The eighth step is to package the fertilizer. Use an automated packaging machine to package the fertilizer in quantitative quantities, and indicate the fertilizer's ingredients, instructions for use, and production date on the package. Store it in a dry and cool place.

9. The method for preparing a novel compound fertilizer containing multiple elements according to claim 8, characterized in that: The fifth step of biological nutrition detection includes nitrogen, phosphorus and potassium content detection, and the specific operation steps are as follows: A1, firstly, random sampling is carried out, and samples are randomly selected from different batches of raw material particles by "Z" shape and "W" shape sampling methods, and 3-5 samples are taken from each batch, and finally the samples are mixed to form a comprehensive sample; A2, pre-treat the comprehensive sample, dry the collected comprehensive sample naturally at room temperature, and then use a sieve to sieve the sample to obtain 2mm particles; A3, chemical analysis of nitrogen content, phosphorus content and potassium content in the sample is performed, wherein the nitrogen content is determined by the Kjeldahl method, the phosphorus content is determined by the molar ratio method and the sample needs to be dissolved in an acid solution, and the potassium content is determined by flame photometry; A4, conduct sample analysis and record the results of the chemical analysis in the laboratory record sheet, including the sample number, specific content of nitrogen, phosphorus and potassium, and the date of analysis.

10. The method for preparing a novel compound fertilizer containing multiple elements according to claim 9, characterized in that: The biological nutrition detection also includes beneficial microorganism detection, and the specific operation steps are as follows: B1, conduct microbial culture, take out fertilizer particles from the comprehensive sample, dilute them and inoculate them on the culture medium to separate and culture the beneficial microorganisms in the compost; B2, perform cultivation adjustment settings, set the cultivation temperature to 25°C-30°C, the cultivation humidity to 70%-90%, and the cultivation time to 3-7 days; B3, perform microbial counts, use the plate count method to count the number of colonies on the culture medium, and record the growth of various microorganisms; B4, conduct microbial identification, identify the isolated microorganisms based on morphological characteristics, staining reactions, and physiological and biochemical characteristics, and record their types and quantities; B5, conduct data analysis and summary, organize and analyze the contents of nitrogen, phosphorus and potassium as well as the types and quantities of microorganisms, evaluate the nutritional value and biological activity of the fertilizer, and adjust the added content of trace elements and nutrients based on the test results.

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