Water-soluble organic fertilizer and preparation method thereof

Abstract

The invention discloses a water-soluble organic fertilizer. A formula of the water-soluble organic fertilizer comprises the following components in percentage by mass: (1) 40-50% of an organic substance; (2) 6-10% of a seaweed extract; (3) 10 to 15 percent of ammonium dihydrogen phosphate; (4) 8-12% of potassium sulfate; (5) 5-8% of sodium alginate; (6) 2-4% of a trace element solution; and (7) 2-3% of citric acid. According to the formula of the water-soluble organic fertilizer disclosed by the invention, through innovative component selection, a coating technology and addition of trace elements, the limitation of the traditional fertilizer in the aspects of water solubility, release characteristic, environmental protection property and fertilizer efficiency control is broken through, and an efficient, environment-friendly and sustainable fertilizer solution is provided. The formula not only can optimize the growth of crops and improve the quality and yield of the crops, but also is favorable for reducing environmental pollution, and meets the requirements of modern agriculture on green and efficient production.

Description

Technical Field

[0001] The present invention relates to the field of agriculture, in particular to a method for preparing a water-soluble organic fertilizer, and in particular to a water-soluble organic fertilizer with good environmental protection and release characteristics and a method for preparing the same. Background Art

[0002] With the continuous development of agricultural production, the use of fertilizers has become one of the key factors in improving crop yield and quality. However, the excessive use of traditional chemical fertilizers, although it can improve soil fertility in the short term, has also brought about a series of environmental problems, such as soil acidification, heavy metal pollution, groundwater pollution, etc. These problems not only affect the sustainable development of agriculture, but also threaten human health. Therefore, the development of environmentally friendly fertilizers has become an important issue in the agricultural field.

[0003] Organic fertilizers play an important role in improving soil quality and promoting crop growth because they are rich in natural organic matter and trace elements. However, traditional organic fertilizers have poor water solubility and often require a long period of degradation to release nutrients, resulting in uneven fertilizer effects, inconvenient application, and serious waste. In addition, since most organic fertilizers release nutrients slowly in the soil, they are prone to accumulation of nutrients, increasing the risk of plant diseases and insect pests, and may even have potential negative impacts on the environment.

[0004] Therefore, in recent years, water-soluble organic fertilizers, as a new type of fertilizer, have gradually been favored by agricultural producers. Water-soluble organic fertilizers can not only dissolve quickly in water and provide immediately available nutrients, but also effectively reduce environmental pollution problems caused by excessive fertilizer application. However, existing water-soluble organic fertilizers still have some limitations in terms of fertilizer release rate, stability of nutrients and environmental friendliness. Therefore, the development of a new type of water-soluble organic fertilizer with good water solubility, continuous fertilizer effect and environmental protection is still an urgent need for current agricultural fertilizer technology innovation.

[0005] The present invention aims to provide a new type of water-soluble organic fertilizer, which has good solubility and the characteristics of rapid nutrient release. At the same time, it adopts natural environmentally friendly materials, which can effectively avoid the environmental pollution problems caused by traditional fertilizers, thereby meeting the dual needs of modern agriculture for fertilizer efficiency and environmental protection. Summary of the invention

[0006] The purpose of the present invention is to provide a water-soluble organic fertilizer, which, through a special formula and preparation method, not only has the characteristics of excellent water solubility and rapid release, but is also environmentally friendly, can improve soil fertility and reduce pollution to the environment.

[0007] Therefore, on one hand, the present invention discloses a water-soluble organic fertilizer, wherein the formula mass ratio of the water-soluble organic fertilizer is as follows: (1) organic matter: 40-50%; (2) seaweed extract: 6-10%; (3) diammonium phosphate: 10-15%; (4) potassium sulfate: 8-12%; (5) sodium alginate: 5-8%; (6) trace element solution: 2-4%; (7) citric acid: 2-3%.

[0008] In one aspect, the present invention also discloses a water-soluble organic fertilizer, wherein the formula mass ratio of the water-soluble organic fertilizer is as follows: (1) organic matter: 40%; (2) seaweed extract: 6%; (3) diammonium phosphate: 10%; (4) potassium sulfate: 12%; (5) sodium alginate: 8%; (6) trace element solution: 2%; and (7) citric acid: 2%.

[0009] Preferably, the organic matter of the present invention is prepared by fermentation and composting of composite microbial strains and plant extracts, wherein the content of water-soluble organic matter in the organic matter is 24.5%±2.2%.

[0010] Preferably, the content of water-soluble organic matter in the seaweed extract of the present invention is 30.2%±2.2%; the seaweed extract is also rich in glutamic acid, aspartic acid, cytokinin and auxin, wherein the contents of glutamic acid, aspartic acid, cytokinin and auxin per 100g of seaweed extract are 5.2g±0.33g, 3.0g±0.21g, 1.23μg±0.056μg and 1.48μg±0.048μg, respectively.

[0011] In one aspect, the present invention also discloses a method for preparing the water-soluble organic fertilizer, which comprises the following steps: (1) batching and mixing; (2) drying and granulation; and (3) quality inspection and packaging.

[0012] Preferably, the (1) batching and mixing of ingredients of the present invention comprises the following steps:

[0013] (1) Add organic matter into a mixing tank according to the proportion;

[0014] (2) adding seaweed extract, ammonium dihydrogen phosphate and potassium sulfate into a mixing tank according to the formula ratio, and stirring them thoroughly to ensure that all nutrients are evenly distributed;

[0015] (3) adding sodium alginate as a coating agent to the mixture, and uniformly distributing the coating material by high shear stirring to form a thin film;

[0016] (4) Add trace element solution and citric acid to the mixture and continue stirring to ensure that all ingredients are evenly blended;

[0017] (5) During the stirring process, gradually add an appropriate amount of water to keep the humidity of the mixture at around 50-60% to ensure that the fertilizer components can be completely dissolved.

[0018] Preferably, the (2) drying and granulation of the present invention comprises the following steps:

[0019] (1) Dry the mixture through a spray dryer at a temperature between 50 and 60°C to prevent the high temperature from destroying the nutrients. After spray drying, the fertilizer is formed into a powder or granular material;

[0020] (2) The dried material can be sieved out into uniform particles or powder products through a sieving device. The size of the particles can be adjusted to meet different fertilization requirements;

[0021] (3) Cool the dried fertilizer and store it in a dry and ventilated environment to avoid moisture absorption.

[0022] Preferably, the (3) quality inspection and packaging of the present invention comprises the following steps:

[0023] (1) Conduct quality inspection on finished fertilizers, with the main inspection items including water solubility, nitrogen, phosphorus, potassium content, trace element content, particle size distribution, pH value, etc.;

[0024] (2) According to the test results, ensure that the fertilizer meets the standards before packaging. The packaging materials should be moisture-proof and pollution-proof to ensure that the fertilizer is not affected by external factors during storage and transportation.

[0025] In one aspect, the present invention also discloses the use of the organic matter in preparing water-soluble organic fertilizer.

[0026] In one aspect, the present invention also discloses the use of the seaweed extract in the preparation of water-soluble organic fertilizer.

[0027] The water-soluble organic fertilizer formula of the present invention breaks through the limitations of traditional fertilizers in terms of water solubility, release characteristics, environmental protection and fertilizer efficiency control through innovative ingredient selection, coating technology and the addition of trace elements, and provides an efficient, environmentally friendly and sustainable fertilizer solution. This innovative formula can not only optimize crop growth, improve the quality and yield of crops, but also help reduce environmental pollution, meeting the requirements of modern agriculture for green and efficient production.

[0028] Description of the drawings (none) DETAILED DESCRIPTION

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art. Unless otherwise specified, the reagents and materials used in the following examples are commercially available.

[0031] Example 1: Formulation of water-soluble organic fertilizer

[0032] 1. The specific formula mass ratio is as follows:

[0033] (1) Organic matter: 40-50%; organic matter fermented by microorganisms is used. These organic matter not only provides the basic nutrients needed by plants, but also promotes soil health by improving soil structure and increasing the diversity of soil microbial communities. Compared with traditional compost, organic matter fermented by microorganisms is easier to dissolve and can provide quickly available nutrients.

[0034] (2) Seaweed extract: 6-10%; Compared with traditional urea or nitrate nitrogen sources, seaweed extract as a nitrogen source can not only provide nitrogen that is quickly absorbed, but also enhance the overall health of crops by stimulating plant root growth and improving plant stress resistance. Seaweed extract is also rich in plant hormones, which can promote plant growth and enhance the ability of crops to resist diseases and pests.

[0035] (3) Diammonium phosphate: 10-15%; Using a water-soluble phosphorus source (diammonium phosphate) instead of traditional phosphate rock powder can ensure that phosphorus element quickly dissolves in water and is absorbed by plants. Diammonium phosphate not only provides the soluble phosphorus required by plants, but also contains a certain amount of nitrogen, forming a nitrogen-phosphorus compound fertilizer, enhancing the root growth of plants and improving the utilization efficiency of soil phosphorus.

[0036] (4) Potassium sulfate: 8-12%; Potassium sulfate, as a potassium source, not only provides potassium, but also provides sulfur required for plant growth. Sulfur can improve the tolerance of plants to heavy metals, promote the synthesis of plant proteins and enzymes, and enhance the stress resistance of crops.

[0037] (5) Sodium alginate: 5-8%; Using natural sodium alginate as a coating material helps control the release rate of fertilizer nutrients. By adjusting the concentration and type of the coating material, the fertilizer nutrients can be slowly released, avoiding excessive release and waste of fertilizer in a short period of time. In addition, sodium alginate has good water solubility and soil improvement function, which can promote the improvement of soil structure.

[0038] (6) Trace element solution: 2-4%; Trace elements are added to provide plants with essential micronutrients, promote plant growth and metabolism, and enhance crop resistance to pests and diseases. Highly efficient chelated trace elements are used to ensure that they can be quickly dissolved in the soil and absorbed by crops, thereby improving plant growth rate and stress resistance.

[0039] (7) Citric acid: 2-3%; organic acids (such as citric acid) can improve the stability of soil pH, promote plant absorption of mineral elements, and combine with elements in mineral fertilizers to improve fertilizer utilization efficiency. Amino acids can also improve plant stress resistance and disease resistance and increase the nutritional value of fertilizers.

[0040] 2. Compared with the current formula, the above formula has the following characteristics:

[0041] (1) Uniqueness of the formula: Compared with traditional fertilizers, this formula uses more natural organic and biogenic ingredients, avoids excessive chemical synthetic substances, reduces the risk of environmental pollution, and meets the requirements of sustainable development of modern agriculture.

[0042] (2) Improved compound fertilizer efficiency: The formula of the present invention optimizes the ratio of various nutrients so that macroelements such as nitrogen, phosphorus, and potassium in the fertilizer work synergistically with trace elements to meet the comprehensive needs of plants, not only promoting plant growth but also enhancing their ability to resist diseases and pests.

[0043] (3) Environmental protection and sustainability: The use of natural materials such as sodium alginate as a coating agent reduces the impact on the environment, and all ingredients in the formula come from renewable resources or natural sources, which is in line with the current trend of environmental protection and sustainable development.

[0044] (4) Rapid and controllable nutrient release: The combination of coating technology and water-soluble fertilizer ingredients enables the fertilizer to quickly provide nutrients in a short period of time, and through the control of the coating material, it can achieve long-term continuous release, avoiding the problem of "too fast fertilizer effect" or "too slow fertilizer effect" of traditional fertilizers and meeting the needs of different crop growth cycles.

[0045] (5) Efficient utilization of trace elements: The use of highly efficient chelated trace elements ensures that these elements can be quickly dissolved in the soil and absorbed by crops, reducing poor plant growth caused by trace element deficiency and improving plant growth rate and health.

[0046] 3. Preparation and testing of organic substances

[0047] (1) Raw material preparation:

[0048] 1) Main raw materials: straw (50%), animal manure (30%), plant residues (10%), food waste (5%), and wood ash (5%).

[0049] 2) Microbial composite strains: composite strains composed of a variety of decomposing bacteria (thermophilic bacteria, lactic acid bacteria, humic acid bacteria, etc.).

[0050] 3) Natural plant extracts: fulvic acid (1%), tea polyphenols (0.5%), and pepper extract (0.5%).

[0051] 4) Nitrogen source optimization materials: insect powder (1%), seaweed powder (3%), wolfberry leaf (1%).

[0052] 5) Organic fertilizer optimizer: plant-based materials rich in humic acid, such as seaweed powder or fulvic acid.

[0053] (2) Composting fermentation process:

[0054] 1) Pretreatment of raw materials: Roughly shear and crush organic materials such as straw, animal manure, plant residues, and food waste to increase the specific surface area and promote the contact and decomposition of microorganisms; add wood ash, insect powder, seaweed powder, etc. to adjust the C / N ratio and provide rich nutrients for microorganisms.

[0055] 2) Inoculation and mixing of strains: Mix the composite microbial strains with water-soluble natural plant extracts (such as fulvic acid and tea polyphenols) in the recommended proportions and spray evenly into the compost raw materials. The composite strains not only help decompose organic matter, but also enhance the water solubility of the compost; stir the mixture thoroughly to ensure that every part can be exposed to the microorganisms and plant extracts.

[0056] 3) Stacking and temperature-controlled fermentation: The processed raw materials are stacked into piles with a stacking height of 1-1.5 meters and the width is adjusted according to the site conditions; equipped with an intelligent temperature control system, which monitors the temperature changes of the compost pile in real time through temperature sensors, and automatically adjusts the heating and ventilation equipment to ensure the optimal temperature (55-65℃) and humidity (50%-60%) of the composting process; the temperature is high in the early stage of composting, which effectively kills harmful pathogens. After entering the middle stage, the temperature is moderate to promote the decomposition of organic matter.

[0057] 4) Regular turning and humidity control: Turn the compost pile every 2-3 days to ensure oxygen supply and uniform fermentation. Add water as needed to maintain humidity between 50%-60%.

[0058] 5) Compost maturity and screening: When the compost temperature is stable at 40-50℃ and the raw materials are fully decomposed, the compost can be considered mature; after screening, the incompletely fermented materials are removed to obtain fine-grained organic compost.

[0059] (3) Innovation control and optimization:

[0060] Automatic adjustment of temperature and humidity: The temperature and humidity inside the compost pile are monitored by sensors, and ventilation and humidity spraying are automatically adjusted to avoid errors caused by manual control.

[0061] Short fermentation cycle: Due to the synergistic effect of composite microbial strains and plant extracts, the fermentation cycle of compost is significantly shortened, and high-quality compost fermentation can usually be completed within 14-21 days.

[0062] (4) Experimental results and data analysis

[0063] 1) Compost temperature change: Under the intelligent temperature control system, the temperature change of the compost pile is more stable and controllable, which significantly improves the fermentation efficiency of the compost. As shown in Table 1, the compost temperature is stabilized between 55-65°C, achieving the effect of high temperature disinfection and rapid fermentation. The fermentation cycle is shorter than that of traditional methods. The compost maturity period is 21 days, and the temperature is controlled within the range most suitable for microbial growth. The pH value gradually drops from 6.8 to 6.2, which is in line with the acidification trend during the composting process, indicating that the organic matter is fully decomposed.

[0064] Table 1 Composting monitoring results

[0065] Time (day) Compost pile temperature (℃) pH humidity(%) Day 1 60 6.8 55 Day 3 65 6.7 56 Day 7 62 6.5 58 Day 14 50 6.3 59 Day 21 48 6.2 60

[0066] 2) Water-soluble organic matter content: The water-soluble organic matter content is an important indicator to measure the fertilizer efficiency of compost. The experimental results are shown in Table 2. The water-soluble organic matter content is 24.5%±2.2%, indicating that the organic matter in the compost has good water solubility and can be effectively absorbed by plant roots to provide the nutrients required for plant growth.

[0067] Table 2 Test results of water-soluble organic matter content

[0068] Sample No. sample Water-soluble organic matter content (%) 24.5±2.2

[0069] 3) Heavy metal content: Heavy metal content testing shows that the finished compost meets environmental protection requirements. The results are shown in Table 3. All heavy metal contents are far below international standards, indicating that the compost does not contain harmful substances and meets environmental protection and agricultural use requirements.

[0070] Table 3 Heavy metal content test results

[0071]

[0072] 4) Plant growth experiment: We selected plants such as mung beans and conducted a compost sample fertilization experiment to compare the effects of compost and conventional fertilizers on plant growth. The results are shown in Table 4. The plants (mung beans and tomatoes) that were applied with compost were significantly better than those that were applied with conventional fertilizers or the control group without fertilizer in terms of growth height and root length. The plants that were applied with compost showed better root growth and overall growth, indicating that the compost has a high fertilizer efficiency and can effectively promote plant growth.

[0073] Table 4 Plant growth experimental results

[0074]

[0075] The combination of composite microbial strains and plant extracts, as well as the application of an intelligent temperature control system, has greatly improved the fermentation efficiency and fertilizer efficiency of compost. In addition, the use of efficient natural plant-based materials and insect powder and other nutrient sources has enhanced the water solubility and nutrient absorbability of compost. The experimental results show that compost can not only quickly complete efficient fermentation, but also the final product has a high content of water-soluble organic matter and good environmental protection characteristics, which is suitable for agricultural production and the promotion of ecological agriculture.

[0076] 4. Preparation and testing of seaweed extracts

[0077] (1) Preparation of seaweed extract

[0078] 1) Preparation of seaweed powder: Use fresh, unpolluted, and unheated seaweed (such as laver and kelp). Seaweed from deep sea areas is preferred because it is richer in nutrients. Wash the seaweed thoroughly in clean water to remove sand and impurities. Use low temperature drying (below 40°C) to avoid degradation of heat-sensitive components in the seaweed until the water content is less than 10%.

[0079] 2) Optimization of seaweed extraction solution: Use deionized water and 50% ethanol solution (volume ratio 1:1) as the solvent base, add 0.5% NaCl salt solution to enhance the extraction efficiency. A small amount of natural surfactants (such as citric acid, glycerol) can be added to increase the water solubility and leaching rate of the active ingredients. The ratio of seaweed powder to solvent is 1:20 (w / v), and the mixed solution is stirred evenly.

[0080] 3) Ultrasonic assisted extraction: Use an ultrasonic extractor with a set frequency of 20kHz and a power of 300W. The extraction process is carried out at 50℃-60℃ and lasts for 30-60 minutes. Ultrasonic assistance can effectively improve the extraction efficiency of effective ingredients in seaweed (such as polysaccharides, amino acids, minerals, etc.). Temperature control and magnetic stirring are used during the extraction process to ensure uniform temperature and improve solubility.

[0081] 4) High-pressure extraction: The mixed solution after ultrasonic extraction is transferred to a high-pressure reactor, and the temperature is set to 80°C and the pressure is 2MPa, and high-pressure extraction is performed for 30 minutes. High pressure can effectively dissolve some poorly water-soluble components and improve the extraction rate. After the extraction is completed, the solution is slowly cooled to room temperature to avoid degradation of the extract by high temperature.

[0082] 5) Filtration and centrifugal separation: Use a 0.45 μm microporous filter to filter and remove solid impurities. The obtained extract is a seaweed extract. Use a centrifuge (3000 rpm, 15 minutes) to further remove fine particles and precipitation to obtain a clear seaweed extract.

[0083] 6) Concentration and pH adjustment: Use a rotary evaporator to concentrate the solvent, remove most of the ethanol and water, and retain the effective ingredients in the seaweed. Concentrate to 1 / 5-1 / 10 of the original volume to obtain a concentrated seaweed extract. Use ammonia water to adjust the pH value to 6.5-7.5 (suitable for plant absorption) to keep the extract stable.

[0084] 7) Storage and application: Store the concentrated seaweed extract at a low temperature (4°C) and avoid direct sunlight. Add the seaweed extract to the water-soluble organic fertilizer in proportion as needed.

[0085] (2) Inspection of seaweed extracts

[0086] 1) Water-soluble organic matter content: The optimized seaweed extract had a high water-soluble organic matter content, reaching 30.2%±2.2%, indicating that the optimized extraction method effectively improved the extraction efficiency of water-soluble active ingredients. As shown in Table 5.

[0087] Table 5 Water-soluble organic matter content of seaweed extracts

[0088] Sample No. Water-soluble organic matter content (%) Optimized extraction solution 30.2±2.2 Conventional extract 25.6±2.9

[0089] 2) Amino acid and plant growth hormone content: The optimized seaweed extract is rich in amino acids (especially glutamic acid and aspartic acid) and contains a certain concentration of plant growth hormones (such as cytokinins and auxins), which has a good potential to promote plant growth and enhance stress resistance. As shown in Table 6.

[0090] Table 6 Amino acids and plant growth hormones in optimized extracts

[0091] Amino Acids / Plant Hormones Content (per 100g seaweed extract) Glutamate 5.2g±0.33g Aspartic acid 3.0g±0.21g Cytokinin (CTK) 1.23μg±0.056μg Auxin (IAA) 1.48μg±0.048μg

[0092] 3) Heavy metal content detection: The heavy metal content in the optimized seaweed extract is far lower than the national standard, which meets environmental protection requirements and ensures its safety as a fertilizer raw material. As shown in Table 7.

[0093] Table 7 Optimized heavy metal content in the extract

[0094] heavy metal Allowable standard (mg / kg) Content (mg / kg) Lead (Pb) 50 0.03 Cadmium (Cd) 10 0.01 Mercury (Hg) 5 0.01 Copper (Cu) 100 0.08 Zinc (Zn) 150 0.3

[0095] 4) Effect on promoting plant growth: The optimized seaweed extract has a significantly better effect on promoting plant growth than the conventional extract, especially in terms of root development and plant height, as shown in Table 8.

[0096] Table 8 Optimization of seaweed extract application effect

[0097] Processing Mung bean growth height (cm) Tomato growth height (cm) Mung bean root length (cm) Apply optimized extract 18.4 32.1 13.2 Apply conventional extract 16.2 30.4 12.5 No fertilizer 8.5 15.1 5.1

[0098] (4) The main differences between the conventional extract preparation method and the optimized extract preparation method of the present invention are shown in Table 9:

[0099] Table 9 Method comparison results

[0100]

[0101] Compared with the conventional extraction method, the optimized extraction method of the present invention mainly optimizes the following aspects:

[0102] 1) Solvent system: A combination of deionized water and 50% ethanol solution is used, and natural surfactants (glycerol, citric acid) are added to better dissolve water-soluble and fat-soluble components and enhance the biological activity and water solubility of the seaweed extract.

[0103] 2) Extraction method: Ultrasonic and high-pressure extraction technology is used to improve extraction efficiency and shorten extraction time.

[0104] 3) Temperature and time control: The extraction temperature is increased and the extraction time is optimized to fully extract the effective ingredients in seaweed.

[0105] 4) Concentration and pH adjustment: The extract is concentrated using a rotary evaporator and the pH is adjusted to an appropriate range to make the extract more suitable for plant absorption.

[0106] 5) Separation and purification: Centrifugation and microfiltration are used to more thoroughly remove impurities and improve the purity of the extract.

[0107] These optimizations make the extraction method of the present invention have significant advantages in extraction efficiency, environmental protection and water solubility.

[0108] 5. Configuration of trace elements

[0109] (1) Zinc sulfate (ZnSO4·7H2O)

[0110] Concentration: 0.1% (weight ratio), i.e. 1000mg / L

[0111] Function: Provide zinc, which plays an important role in chlorophyll synthesis, enzyme activity and stress resistance of plants.

[0112] (2) Copper sulfate (CuSO4·5H2O)

[0113] Concentration: 0.05% (weight ratio), i.e. 500 mg / L

[0114] Function: Provides copper, which is a component of many enzymes in plants and participates in photosynthesis and enhances plant disease resistance.

[0115] (3) Manganese chloride (MnCl2·4H2O)

[0116] Concentration: 0.1% (weight ratio), i.e. 1000mg / L

[0117] Function: Provides manganese, which plays a key role in photosynthesis and is also a component of enzymes essential in many plant metabolic processes.

[0118] (4) Ferric chloride (FeCl3·6H2O)

[0119] Concentration: 0.1% (weight ratio), i.e. 1000mg / L

[0120] Function: Provide iron, which is a key element for plant chlorophyll synthesis and photosynthesis.

[0121] (5) Boric acid (H3BO3)

[0122] Concentration: 0.02% (weight ratio), i.e. 200 mg / L

[0123] Function: Provides boron, which plays an important role in pollen germination, flower bud differentiation and cell wall structure of plants.

[0124] (6) Ammonium molybdate (AMoO4·4H2O)

[0125] Concentration: 0.01% (weight ratio), i.e. 100 mg / L

[0126] Function: Provides molybdenum, which is a key element involved in nitrogen metabolism in plants, especially playing an important role in nitrogen fixation and nitrate reductase reaction.

[0127] (7) Cobalt chloride (CoCl2·6H2O)

[0128] Concentration: 0.005% (weight ratio), i.e. 50 mg / L

[0129] Function: Provides cobalt, which promotes nitrogen metabolism and root growth of plants, especially in the nitrogen fixation process of some plants.

[0130] (8) Aluminum sulfate (Al2(SO4)3·18H2O)

[0131] Concentration: 0.01% (weight ratio), i.e. 100 mg / L

[0132] Function: Provide aluminum, which is mainly used for growth regulation of certain specific plants, especially beneficial to plants under acidic soil conditions.

[0133] (9) Instructions for use:

[0134] Total concentration: In the above solution, the total concentration of trace elements is about 0.43%, corresponding to about 4.3g of trace element mixture per liter of aqueous solution.

[0135] Preparation method: Each trace element is prepared according to the above concentration and added to the formula of water-soluble organic fertilizer in the form of solution when necessary, or directly dissolved in irrigation water for application.

[0136] Example 2: Preparation of water-soluble organic fertilizer

[0137] 1. Ingredients and mixing

[0138] (1) Add organic matter into the mixing tank according to the proportion.

[0139] (2) Add seaweed extract, ammonium dihydrogen phosphate and potassium sulfate into the mixing tank according to the formula ratio, and stir them thoroughly to ensure that all nutrients are evenly distributed.

[0140] (3) Sodium alginate is added to the mixture as a coating agent, and the coating material is evenly distributed through high shear stirring to form a thin film.

[0141] (4) Add trace element solution and citric acid to the mixture and continue stirring to ensure that all ingredients are evenly blended.

[0142] (5) During the stirring process, gradually add an appropriate amount of water to keep the humidity of the mixture at around 50-60% to ensure that the fertilizer components can be completely dissolved.

[0143] 2. Drying and granulation

[0144] (1) The mixture is dried by a spray dryer at a temperature between 50 and 60°C to prevent the high temperature from destroying the nutrients. After spray drying, a powder or granular material of the fertilizer is formed.

[0145] (2) The dried material can be screened out into uniform particles or powdered products through a screening device. The size of the particles can be adjusted to meet different fertilization requirements.

[0146] (3) Cool the dried fertilizer and store it in a dry and ventilated environment to avoid moisture absorption.

[0147] 3. Quality inspection and packaging

[0148] (1) Conduct quality inspection on finished fertilizers. The main inspection items include water solubility, nitrogen, phosphorus, potassium content, trace element content, particle size distribution, pH value, etc.

[0149] (2) According to the test results, ensure that the fertilizer meets the standards before packaging. The packaging materials should be moisture-proof and pollution-proof to ensure that the fertilizer is not affected by external factors during storage and transportation.

[0150] Example 3: Comparison of water-soluble organic fertilizers with different formulations

[0151] 1. Formula preparation experiment

[0152] Through multiple formulation experiments, the proportion of each component is optimized and the fertilizer effect of each experiment is tested. After each experiment, samples are taken to test the solubility, fertilizer effect and trace element content of the fertilizer.

[0153] As can be seen from Table 9, Formula 2 has the best solubility and stable fertilizer effect, which can quickly meet the plant's nutrient needs. Compared with other formulas, Formula 2 can provide more comprehensive nutrients, and the release rate of nutrients is controlled by a reasonable ratio of sodium alginate, which meets the target fertilizer characteristics.

[0154] Table 9 Comparison results of formulation experiment

[0155] formula Organic matter Seaweed Extract Ammonium dihydrogen phosphate Potassium sulfate Sodium alginate Trace Elements Citric Acid result 1 45％ 8％ 12％ 10％ 6％ 3％ 2％ better 2 40％ 6％ 10％ 12％ 8％ 2％ 2％ excellent 3 50％ 10％ 15％ 8％ 5％ 4％ 3％ generally 4 43％ 7％ 11％ 10％ 7％ 3％ 2％ excellent

[0156] 2. Water solubility and fertilizer efficiency experiment

[0157] A water solubility test was conducted for each formula, and the nutrient release of the fertilizer at different time periods was measured. Each formula fertilizer was dissolved in 100 mL of water and stirred evenly. Samples were taken at different time points (1 hour, 4 hours, 12 hours, 24 hours, and 48 hours) to measure the concentrations of nitrogen, phosphorus, and potassium in the aqueous solution.

[0158] As can be seen from Table 10, Formula 2 has obvious advantages in the release rate of nitrogen, phosphorus and potassium, and can quickly release nutrients in a short time to meet the needs of plants. At the same time, Formula 2 can still maintain a high nutrient release efficiency after 48 hours, showing good sustained fertilizer effect.

[0159] Table 10 Water solubility and fertilizer efficiency experimental results

[0160] time Formula 1 (Nitrogen) Formula 2 (Nitrogen) Formula 3 (Nitrogen) Formula 4 (Nitrogen) Formula 2 (Phosphorus) Formula 2 (Potassium) 1 hour 40％ 45％ 38％ 41％ 20％ 30％ 4 hours 60％ 75％ 55％ 63％ 40％ 50％ 12 hours 80％ 90％ 72％ 77％ 60％ 70％ 24 hours 95％ 98％ 85％ 90％ 80％ 85％ 48 hours 100％ 100％ 90％ 98％ 90％ 90％

[0161] 3. Field application effect test

[0162] Field trials were conducted in the same area to compare the crop growth of water-soluble organic fertilizers with Formula 2 and traditional chemical fertilizers. The crop height and yield of water-soluble organic fertilizers with Formula 2 were significantly better than those of traditional chemical fertilizers and the control group, showing the advantages of this fertilizer in promoting crop growth and increasing yield. See Table 11.

[0163] Table 11 Field application effect test results

[0164] Treatment Crop height (cm) Growth cycle (days) Yield (kg / mu) Formula 2 Fertilizer 120 60 250 Traditional fertilizers 115 60 220 Control group 110 60 180

[0165] 4. The water-soluble organic fertilizer provided by the present invention has good water solubility through reasonable formulation and optimized preparation method, and can also achieve controlled release of nutrients, and has significant fertilizer efficiency and environmental protection characteristics. Experimental data show that the fertilizer of the present invention can better meet the growth needs of plants, increase yield, and have less negative impact on the environment than traditional fertilizers. The details are as follows:

[0166] (1) Optimization of formulation

[0167] 1) Source and treatment of organic matter: Use organic matter fermented by microorganisms to replace the unfermented organic matter that is difficult to dissolve in traditional organic fertilizers. Microbial fermentation not only improves the water solubility of organic matter, but also improves soil health and increases the fertilizer efficiency. This treatment method has a significant advantage of rapid solubility over traditional composting.

[0168] 2) Addition of seaweed extract: Seaweed extract is rich in plant hormones (such as cytokinins and auxins). Compared with common urea or nitrate nitrogen sources, it not only provides nitrogen, but also improves the comprehensive effect of fertilizer by promoting plant growth and enhancing stress resistance. This natural plant hormone ingredient is a rare innovation in the current fertilizer market.

[0169] 3) Natural coating technology (sodium alginate): By using sodium alginate as the coating material, the release rate of fertilizer nutrients is controlled, effectively avoiding the problem of too fast or too slow fertilizer effect. This technology innovatively combines water solubility and slow release functions, providing a more flexible fertilization plan that can meet the needs of different crops.

[0170] (2) Fertilizer efficiency and environmental friendliness

[0171] 1) Efficient utilization of trace elements: The use of highly efficient chelated trace element solution ensures that the trace elements can be quickly absorbed by plants, avoiding the low utilization efficiency of trace elements in traditional fertilizers due to chemical instability or precipitation.

[0172] 2) Environmental protection: This fertilizer uses natural seaweed extracts and sodium alginate, avoiding the excessive use of chemical synthetics in traditional fertilizers, and is in line with the concept of green agriculture and sustainable development. Compared with the environmental pollution caused by excessive use of chemical fertilizers, the use of this fertilizer helps reduce soil acidification and groundwater pollution.

[0173] (3) Preparation process innovation

[0174] 1) Composting fermentation process and intelligent temperature control system: Through the synergistic effect of composite microbial strains and natural plant extracts, the composting fermentation cycle is significantly shortened (14-21 days), and an intelligent temperature control system is used to optimize the composting environment to ensure that the temperature and humidity are always within the most suitable range for microbial growth. This technology can improve fermentation efficiency and effectively reduce environmental pollution and nutrient loss during the fermentation process.

[0175] 2) Coating technology for controlled nutrient release: Using sodium alginate coating material, combined with the release characteristics of water-soluble components and coating materials, the fertilizer can continuously release nutrients under different environmental conditions, avoiding the environmental pollution caused by excessive application of traditional fertilizers. The innovation of coating technology improves the economic benefits and environmental friendliness of fertilizer use.

[0176] (4) Summary

[0177] 1) Unique formula and ingredient selection: Compared with existing technologies, it uses natural ingredients such as seaweed extract and sodium alginate, which reduces dependence on traditional chemical synthetic fertilizers, improves the water solubility and environmental friendliness of fertilizers, and improves soil structure and crop health.

[0178] 2) Optimize fertilizer efficiency control: Through the use of coating technology and high-efficiency trace elements, the rapid dissolution and slow release control of fertilizers can be achieved, ensuring that crops can obtain the best nutrient supply at different growth stages, improving the efficiency of fertilizer use and reducing the risk of environmental pollution.

[0179] 3) High efficiency and automated control of composting fermentation: Through automatic temperature and humidity adjustment technology, the composting fermentation time is shortened and the fermentation quality is improved, especially high temperature disinfection and enhanced microbial activity, which makes the composting process more efficient and controllable, and improves the environmental protection and economy of the entire fertilizer production process.

[0180] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A water-soluble organic fertilizer, characterized in that: The formula mass ratio of the water-soluble organic fertilizer is as follows: (1) Organic matter: 40-50%; (2) Seaweed extract: 6-10%; (3) diammonium phosphate: 10-15%; (4) Potassium sulfate: 8-12%; (5) Sodium alginate: 5-8%; (6) Trace element solution: 2-4%; (7) Citric acid: 2-3%.

2. A water-soluble organic fertilizer, characterized in that: The formula mass ratio of the water-soluble organic fertilizer is as follows: (1) Organic matter: 40%; (2) Seaweed extract: 6%; (3) diammonium phosphate: 10%; (4) Potassium sulfate: 12%; (5) Sodium alginate: 8%; (6) Trace element solution: 2%; (7) Citric acid: 2%.

3. The water-soluble organic fertilizer according to any one of claims 1 or 2, characterized in that: The organic matter is prepared by fermenting and composting composite microbial strains and plant extracts, wherein the content of water-soluble organic matter in the organic matter is 24.5%±2.2%.

4. The water-soluble organic fertilizer according to any one of claims 1 or 2, characterized in that: The content of water-soluble organic matter in the seaweed extract is 30.2%±2.2%; the seaweed extract is also rich in glutamic acid, aspartic acid, cytokinin and auxin, wherein the contents of glutamic acid, aspartic acid, cytokinin and auxin per 100g of seaweed extract are 5.2g±0.33g, 3.0g±0.21g, 1.23μg±0.056μg and 1.48μg±0.048μg respectively.

5. A method for preparing the water-soluble organic fertilizer according to any one of claims 1 or 2, characterized in that: The method comprises the following steps: (1) Batching and mixing; (2) Drying and granulation; (3)Quality inspection and packaging.

6. The method according to claim 5, characterized in that The (1) batching and mixing comprises the following steps: (1) Add organic matter into a mixing tank according to the proportion; (2) adding seaweed extract, ammonium dihydrogen phosphate and potassium sulfate into a mixing tank according to the formula ratio, and stirring them thoroughly to ensure that all nutrients are evenly distributed; (3) adding sodium alginate as a coating agent to the mixture, and uniformly distributing the coating material by high shear stirring to form a thin film; (4) Add trace element solution and citric acid to the mixture and continue stirring to ensure that all ingredients are evenly blended; (5) During the stirring process, gradually add an appropriate amount of water to keep the humidity of the mixture at around 50-60% to ensure that the fertilizer components can be completely dissolved.

7. The method according to claim 5, characterized in that The (2) drying and granulation comprises the following steps: (1) The mixture is dried by a spray dryer at a temperature between 50 and 60°C to prevent the high temperature from destroying the nutrients. After spray drying, a powder or granular material of the fertilizer is formed; (2) The dried material can be sieved out into uniform particles or powder products through a sieving device. The size of the particles can be adjusted to meet different fertilization requirements; (3) Cool the dried fertilizer and store it in a dry and ventilated environment to avoid moisture absorption.

8. The method according to claim 5, characterized in that The (3) quality inspection and packaging includes the following steps: (1) Conduct quality inspection on finished fertilizers, with the main inspection items including water solubility, nitrogen, phosphorus, potassium content, trace element content, particle size distribution, pH value, etc.; (2) According to the test results, ensure that the fertilizer meets the standards before packaging. The packaging materials should be moisture-proof and pollution-proof to ensure that the fertilizer is not affected by external factors during storage and transportation.

9. Use of the organic substance as claimed in claim 3 in the preparation of water-soluble organic fertilizer.

10. Use of the seaweed extract according to claim 4 in preparing water-soluble organic fertilizer.

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