Alginate humic acid water-soluble fertilizer and preparation method thereof

Abstract

The application discloses a kind of alginic acid humic acid water-soluble fertilizer and preparation method thereof, belong to water-soluble fertilizer preparation technical field.The fertilizer is made of alginic acid extract, water-soluble humic acid etc., boron acid and nitrate substance are not added throughout.The application adopts preparation process of phase separation pretreatment, gradient compounding, high-pressure homogenization, first respectively preparing alginic acid mother liquor and humic acid clear liquid, then sequentially compounding macroelement, functional active ingredient, and obtaining finished product after filtration homogenization.The application formula ratio is scientific, each component has synergistic effect, product solubility is good, system is stable, storage is not stratified precipitation, can effectively improve soil structure, activate soil nutrients, promote crop growth, improve crop stress resistance and yield quality, solve the problem that traditional water-soluble fertilizer has single function, is easy to cause soil salinization, and nutrient utilization rate is low, process is simple, suitable for large-scale industrial production.

Description

Technical Field

[0001] This invention relates to the field of water-soluble fertilizer technology, specifically to a seaweed acid-humic acid water-soluble fertilizer and its preparation method. Background Technology

[0002] Water-soluble fertilizers are a core category of fertilizers in modern precision fertilization and water-saving agriculture. They have advantages such as good solubility, high absorption and utilization rate, and compatibility with various fertilization methods such as drip irrigation, sprinkler irrigation, and foliar spraying. They are widely used in the planting of fruits, vegetables, grains, and cash crops. Currently, the mainstream seaweed acid water-soluble fertilizers and humic acid water-soluble fertilizers on the market have single functions. Seaweed acid fertilizers alone focus on stimulating crop growth and improving stress resistance, but their effects on soil improvement and nutrient activation are poor. Humic acid fertilizers alone focus on improving soil and consolidating nutrients, but their ability to regulate crop growth and rapidly replenish nutrients is insufficient.

[0003] To enhance micronutrient content and fertilizer stability, most existing compound water-soluble fertilizers contain boric acid and nitrates. Long-term use of these ingredients can lead to soil salinity accumulation, soil compaction, and acidification. Furthermore, nitrate residues can cause excessive pesticide residues in crops, and excessive boric acid application can inhibit the absorption of calcium and magnesium by crop roots, affecting crop quality. In addition, existing fertilizer formulations are often poorly proportioned, exhibiting problems such as poor nutrient solubility, easy sedimentation of active ingredients, short-lived effects, and low nutrient utilization, failing to meet the multiple needs of crop growth, soil improvement, and stress resistance enhancement. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a seaweed acid-humic acid water-soluble fertilizer and its preparation method, which solves the problems of existing fertilizers having limited functions, containing harmful additives, having low nutrient utilization rates, and easily causing soil pollution.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows: a seaweed acid and humic acid water-soluble fertilizer, prepared from the following raw materials in parts by weight: 20-35 parts seaweed acid extract, 15-28 parts water-soluble humic acid, 10-18 parts urea, 8-15 parts potassium dihydrogen phosphate, 6-12 parts potassium sulfate, 2-6 parts chelated trace elements, 3-8 parts compound amino acids, 0.5-2 parts polyglutamic acid, and 30-60 parts deionized water.

[0006] Preferably, the alginic acid extract is prepared from brown algae through low-temperature enzymatic hydrolysis, with an effective alginic acid content of ≥80% and a particle size of 80-120 mesh. The low-temperature enzymatic hydrolysis process can retain the active substances such as alginic polysaccharides, mannitol, and betaine in the alginic acid to the greatest extent. The fine particle size ensures rapid and complete dissolution in water without residue, making it suitable for various integrated water and fertilizer equipment.

[0007] Preferably, the water-soluble humic acid is either potassium humate or ammonium humate, and the effective humic acid content is ≥75%. This type of water-soluble humic acid has extremely high solubility, can effectively activate soil to fix nutrients, improve soil aggregate structure, enhance soil water and fertilizer retention capacity, and at the same time buffer fertilizer pH to avoid fertilizer damage.

[0008] Preferably, the chelated trace elements are a combination of chelated calcium, chelated magnesium, chelated zinc, and chelated iron, prepared using an amino acid chelation process. Amino acid chelated trace elements are highly stable, not easily fixed by the soil, and can be directly absorbed and utilized by crop roots and leaves, effectively solving problems such as nutrient deficiency causing yellowing, weak growth, and low fruit set in crops. Furthermore, the preparation process leaves no nitrate or borate residues, making it green and pollution-free.

[0009] Preferably, the compound amino acid contains glycine, proline, lysine, and glutamic acid, with a total amino acid content ≥90%. These various plant-derived amino acids can directly participate in crop protein synthesis, promote crop cell division and growth, improve crop photosynthetic efficiency, and enhance crop resistance to cold, drought, and pests.

[0010] The preparation method of the above-mentioned alginic acid and humic acid water-soluble fertilizer includes the following steps: S1. Pretreatment: Mix the alginate extract with half the total amount of deionized water and stir at room temperature for 15–25 min to prepare a homogeneous alginate mother liquor; mix the water-soluble humic acid with the remaining deionized water, heat to 40–50℃ and stir for 20–30 min to prepare a clear humic acid solution. Phase separation dissolution can avoid the agglomeration and clumping phenomenon that occurs when alginate and humic acid are directly mixed, ensuring that the two core active ingredients are fully dissolved and dispersed.

[0011] S2. Basic Nutrient Compound Preparation: Add urea, potassium dihydrogen phosphate, and potassium sulfate sequentially to the clarified humic acid solution. Stir at a constant temperature of 40–50°C for 30–40 minutes until the materials are completely dissolved to obtain the basic fertilizer solution. The stepwise dissolution of nitrogen, phosphorus, and potassium improves dissolution efficiency, ensures uniform distribution of basic nutrients, and provides sufficient core nutrition for crop growth.

[0012] S3. Addition of Functional Ingredients: Pour the seaweed acid mother liquor into the base fertilizer solution, stir and mix well, then add the compound amino acids, chelated trace elements, and polyglutamic acid in sequence, and keep warm and stir for 20-30 minutes. Polyglutamic acid, as a high-molecular moisturizing and synergistic agent, can lock in nutrients and reduce nutrient loss. It works synergistically with seaweed acid, humic acid, and amino acids to significantly improve fertilizer utilization.

[0013] S4. Filtration and Homogenization: Cool the mixed fertilizer solution to room temperature, filter it through a 200-300 mesh filter to remove impurities, and then homogenize it for 10-15 minutes. After standing to defoam, the finished seaweed acid and humic acid water-soluble fertilizer is obtained. Filtration removes trace amounts of insoluble impurities from the raw materials, and homogenization ensures that all nutrients and active ingredients are highly integrated, guaranteeing the stability of the fertilizer system and preventing stratification and sedimentation during long-term storage.

[0014] Furthermore, the stirring speed in steps S1, S2, and S3 is controlled between 300 and 500 r / min. This speed range can balance dissolution efficiency and material stability.

[0015] Furthermore, in step S4, the homogenization pressure is controlled at 20–30 MPa, resulting in a water-soluble fertilizer with a pH of 5.5–7.5 and a water-insoluble content of ≤0.5%. Fertilizer prepared under these parameters has a pH suitable for the growth needs of most crops, excellent solubility, and will not clog irrigation equipment.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This invention completely eliminates harmful raw materials such as boric acid and nitrates, thus avoiding problems such as soil salinization, compaction and acidification, and excessive pesticide residues in crops from the root. At the same time, it eliminates the drawback of boric acid inhibiting the absorption of trace elements in crops, making it green and environmentally friendly, and suitable for green organic agricultural planting scenarios. It combines the effects of fast-acting fertilization and long-term soil improvement, effectively promoting crop root growth and seedling development, improving quality and increasing yield, while improving soil aggregate structure and activating soil nutrient fixation. The fertilizer system is uniform and stable, with no stratification or sedimentation during long-term storage, and low water-insoluble content, making it suitable for various application methods such as drip irrigation, fertigation, and foliar spraying. The various active ingredients work synergistically, significantly improving nutrient absorption and utilization rates compared to conventional water-soluble fertilizers. Attached Figure Description

[0017] Figure 1 This is a process flow diagram of the preparation method of the present invention. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings.

[0019] Example 1 A seaweed acid and humic acid water-soluble fertilizer is composed of the following raw materials in parts by weight: 25 parts seaweed acid extract, 20 parts water-soluble potassium humate, 12 parts urea, 10 parts potassium dihydrogen phosphate, 8 parts potassium sulfate, 3 parts chelated calcium, magnesium, zinc and iron combination, 5 parts compound amino acids, 1 part polyglutamic acid, and 45 parts deionized water.

[0020] Among them, the effective content of alginic acid extract is ≥80%, and the particle size is 100 mesh; the total content of compound amino acids is ≥90%.

[0021] The preparation method includes the following steps: S1. Pretreatment: Mix 25 parts of alginate extract with 22.5 parts of deionized water, stir at 400 r / min for 20 min at room temperature to obtain alginate mother liquor; mix 20 parts of potassium humate with 22.5 parts of deionized water, heat to 45℃, stir at 400 r / min for 25 min to obtain humic acid clear liquid. S2. Basic nutrient compounding: Add 12 parts urea, 10 parts potassium dihydrogen phosphate and 8 parts potassium sulfate to the humic acid clear liquid in sequence, stir at 400r / min for 35min at a constant temperature of 45℃ until the materials are completely dissolved to obtain the basic fertilizer solution. S3. Functional ingredient addition: Pour the seaweed acid mother liquor into the base fertilizer solution, stir and mix well, then add 5 parts of compound amino acids, 3 parts of chelated trace elements, and 1 part of polyglutamic acid in sequence, keep warm at 45℃ and stir at 400r / min for 25min. S4. Filtration and homogenization: The fertilizer solution is naturally cooled to room temperature, filtered through a 250-mesh filter to remove impurities, homogenized under 25MPa pressure for 12 minutes, and then allowed to stand to defoam before obtaining the finished water-soluble fertilizer.

[0022] Example 2 A seaweed acid and humic acid water-soluble fertilizer is composed of the following raw materials in parts by weight: 30 parts seaweed acid extract, 25 parts water-soluble ammonium humate, 15 parts urea, 12 parts potassium dihydrogen phosphate, 10 parts potassium sulfate, 5 parts chelated calcium, magnesium, zinc and iron combination, 7 parts compound amino acids, 1.5 parts polyglutamic acid, and 50 parts deionized water.

[0023] Among them, the effective content of alginic acid extract is ≥80%, and the particle size is 100 mesh; the total content of compound amino acids is ≥90%.

[0024] The preparation method includes the following steps: S1. Pretreatment: Mix 30 parts of alginate extract with 25 parts of deionized water, stir at room temperature and 450 r / min for 20 min to obtain alginate mother liquor; mix 25 parts of ammonium humate with 25 parts of deionized water, heat to 48℃, stir at 450 r / min for 25 min to obtain humic acid clear liquid. S2. Basic nutrient compounding: Add 15 parts urea, 12 parts potassium dihydrogen phosphate and 10 parts potassium sulfate to the humic acid clear liquid in sequence, stir at 450r / min for 35min at 48℃ until the materials are completely dissolved to obtain basic fertilizer solution. S3. Addition of functional ingredients: Pour the seaweed acid mother liquor into the base fertilizer solution, stir and mix well, then add 7 parts of compound amino acids, 5 parts of chelated trace elements, and 1.5 parts of polyglutamic acid in sequence, keep warm at 48℃ and stir at 450r / min for 25min. S4. Filtration and homogenization: The fertilizer solution is naturally cooled to room temperature, filtered through a 250-mesh filter to remove impurities, homogenized under 28MPa pressure for 12 minutes, and then allowed to stand to defoam before obtaining the finished water-soluble fertilizer.

[0025] Example 3 A seaweed acid and humic acid water-soluble fertilizer is composed of the following raw materials in parts by weight: 20 parts seaweed acid extract, 15 parts water-soluble potassium humate, 10 parts urea, 8 parts potassium dihydrogen phosphate, 6 parts potassium sulfate, 2 parts chelated calcium, magnesium, zinc and iron combination, 3 parts compound amino acids, 0.5 parts polyglutamic acid, and 30 parts deionized water.

[0026] Among them, the effective content of alginic acid extract is ≥80%, and the particle size is 100 mesh; the total content of compound amino acids is ≥90%.

[0027] The preparation method includes the following steps: S1. Pretreatment: Mix 20 parts of alginate extract with 15 parts of deionized water, stir at 350 r / min for 20 min at room temperature to obtain alginate mother liquor; mix 15 parts of potassium humate with 15 parts of deionized water, heat to 42℃, stir at 350 r / min for 25 min to obtain humic acid clear liquid. S2. Basic nutrient compounding: Add 10 parts urea, 8 parts potassium dihydrogen phosphate and 6 parts potassium sulfate to the humic acid clear liquid in sequence, stir at 350r / min for 35min at 42℃ until the materials are completely dissolved to obtain basic fertilizer solution. S3. Addition of functional ingredients: Pour the seaweed acid mother liquor into the base fertilizer solution, stir and mix well, then add 3 parts of compound amino acids, 2 parts of chelated trace elements, and 0.5 parts of polyglutamic acid in sequence, keep warm at 42℃ and stir at 350r / min for 25min. S4. Filtration and homogenization: The fertilizer solution is naturally cooled to room temperature, filtered through a 250-mesh filter to remove impurities, homogenized under 22MPa pressure for 12 minutes, and then allowed to stand to defoam before obtaining the finished water-soluble fertilizer.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A water-soluble fertilizer containing alginic acid and humic acid, characterized in that, It is prepared from the following raw materials in parts by weight: 20-35 parts of alginate extract, 15-28 parts of water-soluble humic acid, 10-18 parts of urea, 8-15 parts of potassium dihydrogen phosphate, 6-12 parts of potassium sulfate, 2-6 parts of chelated trace elements, 3-8 parts of complex amino acids, 0.5-2 parts of polyglutamic acid, and 30-60 parts of deionized water.

2. The alginic acid-humic acid water-soluble fertilizer according to claim 1, characterized in that, The alginic acid extract is prepared by low-temperature enzymatic hydrolysis of brown algae, with an effective alginic acid content of ≥80% and a particle size of 80-120 mesh.

3. The alginic acid-humic acid water-soluble fertilizer according to claim 1, characterized in that, The water-soluble humic acid is either potassium humate or ammonium humate, and the effective content of humic acid is ≥75%.

4. The alginic acid-humic acid water-soluble fertilizer according to claim 1, characterized in that, The chelated trace elements are a combination of chelated calcium, chelated magnesium, chelated zinc, and chelated iron, prepared using an amino acid chelation process.

5. The alginic acid-humic acid water-soluble fertilizer according to claim 1, characterized in that, The compound amino acid contains glycine, proline, lysine, and glutamic acid, with a total amino acid content of ≥90%.

6. A method for preparing the alginic acid-humic acid water-soluble fertilizer according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Pretreatment: Mix the alginate extract with half the total amount of deionized water and stir at room temperature for 15-25 minutes to prepare a uniform alginate mother liquor; mix the water-soluble humic acid with the remaining deionized water, heat to 40-50℃ and stir for 20-30 minutes to prepare a humic acid clear liquid. S2. Basic nutrient compounding: Add urea, potassium dihydrogen phosphate and potassium sulfate to the humic acid clear liquid in sequence, stir at a constant temperature of 40-50℃ for 30-40 minutes until the materials are completely dissolved to obtain basic fertilizer solution. S3. Addition of functional ingredients: Pour the seaweed acid mother liquor into the base fertilizer solution, stir and mix well, then add the compound amino acids, chelated trace elements and polyglutamic acid in sequence, keep warm and stir for 20-30 minutes. S4. Filtration and homogenization: Cool the mixed fertilizer solution to room temperature, filter it through a 200-300 mesh filter to remove impurities, then homogenize it for 10-15 minutes using a homogenizer, and after standing to defoam, obtain the finished seaweed acid and humic acid water-soluble fertilizer.

7. The method for preparing the alginic acid-humic acid water-soluble fertilizer according to claim 6, characterized in that, In steps S1, S2, and S3, the stirring speed is controlled at 300–500 r / min.

8. The method for preparing the alginate-humic acid water-soluble fertilizer according to claim 6, characterized in that, In step S4, the homogenization pressure is controlled at 20-30 MPa, the resulting water-soluble fertilizer has a pH value of 5.5-7.5, and the content of water-insoluble matter is ≤0.5%.

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