A root-promoting and seedling-strengthening seaweed oligopeptide fertilizer and its production process

Abstract

This application discloses a seaweed oligopeptide fertilizer for promoting root growth and seedling development, and its production process, belonging to the field of fertilizer technology. The fertilizer, by weight, comprises: 2-10 parts seaweed oligopeptide complex, 1-8 parts seaweed extract, 10-30 parts compound amino acids, 1-10 parts blueberry pomace, 20-50 parts oxytetracycline waste decomposition products, and 30-60 parts recycled organic matter from kitchen waste. By combining seaweed oligopeptides with chitosan to form a complex, the stability of the active ingredients is improved; simultaneously, the synergistic utilization of oxytetracycline fermentation waste, kitchen waste, and blueberry pomace achieves resource utilization. Experiments show that this fertilizer significantly promotes crop root growth and seedling development.

Description

Technical Field

[0001] This invention relates to the field of fertilizer technology, and in particular to a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer and its production process. Background Technology

[0002] With the rapid development of agricultural modernization, the demand for root-promoting and seedling-strengthening fertilizers in crop cultivation is increasing. These fertilizers must not only meet the nutritional needs of crop growth but also consider environmental protection and resource utilization. Currently, most root-promoting and seedling-strengthening fertilizers on the market are based on single nutrient components or simple compound formulations, resulting in problems such as unbalanced nutrition, limited efficacy, and low utilization rates. They fail to simultaneously achieve the multiple goals of promoting crop root growth, enhancing seedling resistance, and improving the soil environment.

[0003] Meanwhile, improper handling of oxytetracycline fermentation waste liquid, kitchen waste, and agricultural product processing by-products generated in industrial production and daily life can cause serious environmental pollution: oxytetracycline fermentation waste liquid contains residual antibiotics and high concentrations of organic pollutants, making treatment costly and difficult; kitchen waste is easily perishable, producing foul odors and leachate, polluting soil and water bodies; and blueberry pomace is mostly discarded, resulting in resource waste. Furthermore, existing seaweed oligopeptide fertilizers are prone to photothermal decomposition and rapid degradation in soil, leading to insufficient efficacy and low utilization rates; while traditional adsorbents for treating industrial waste liquids suffer from separation difficulties and the potential for secondary pollution, making it difficult to achieve a balance between environmental protection and high efficiency.

[0004] Therefore, developing a fertilizer and its production process that can achieve resource utilization of waste, balanced nutrition, significant root and seedling growth effects, and environmentally friendly and efficient production, and to overcome the shortcomings of existing technologies, has become an urgent technical problem to be solved in the current agricultural field. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing root-promoting and seedling-strengthening fertilizers, such as single efficacy, low resource utilization, poor environmental performance, difficulty in waste treatment, and environmental pollution. This invention provides a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer and its production process, which realizes the synergistic resource utilization of industrial and domestic waste, while improving the root-promoting and seedling-strengthening effect and nutrient utilization rate of the fertilizer, taking into account both environmental protection and practicality.

[0006] This application provides a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer, which comprises the following components by weight: 2-10 parts of seaweed oligopeptide complex, 1-8 parts of seaweed extract, 10-30 parts of compound amino acids, 1-10 parts of blueberry pomace, 20-50 parts of oxytetracycline waste liquid decomposition product, and 30-60 parts of kitchen waste recycled organic material.

[0007] Preferably, the seaweed oligopeptide complex is seaweed oligopeptides encapsulated in chitosan.

[0008] Preferably, the complex amino acid includes at least one of lysine, methionine, threonine, and leucine.

[0009] Preferably, the mass ratio of chitosan to seaweed oligopeptides is 2 to 8:1.

[0010] This application also provides a production process for a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer, the production process comprising the following steps:

[0011] (1) Crush the seaweed extract and compound amino acids separately and set aside;

[0012] (2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 250-300 r / min and continue stirring; finally add seaweed oligopeptide complex and stir to obtain the mixture.

[0013] (3) Homogenization and refinement: The mixture obtained in step (2) is fed into a homogenizer, and the homogenization pressure is controlled at 20-30 MPa and the homogenization time is 5-10 min to obtain homogenized material;

[0014] (4) Granulation:

[0015] a. Drying and granulation: The homogeneous material is fed into a spray dryer with an inlet air temperature of 180-200℃ and an outlet air temperature of 80-90℃. After drying and screening, a powder-type seaweed oligopeptide fertilizer for rooting and seedling strengthening is obtained.

[0016] b. Water-based fertilizer: Add the homogeneous material to deionized water and stir until completely dissolved. Then add a pH adjuster to adjust the pH of the system to 5.5-7.0. Filter to obtain water-based root-promoting and seedling-strengthening seaweed oligopeptide fertilizer.

[0017] Preferably, the preparation process of the recycled kitchen waste organic material is as follows: the recycled kitchen waste is sorted to remove impurities, crushed, and then placed in a fermentation tank, fermentation agent is added, fermentation is carried out, and cooling is performed to obtain the recycled kitchen waste organic material.

[0018] Preferably, the preparation method of the oxytetracycline waste liquid decomposition product is as follows: take oxytetracycline fermentation waste liquid, use magnetic iron-based biochar adsorbent for physical adsorption, add chlorine-resistant compound bacterial agent for fermentation to obtain passivation product, and separate the passivation product to obtain oxytetracycline waste liquid decomposition product.

[0019] Preferably, the preparation method of the blueberry pomace is as follows: take the pomace remaining after blueberry processing, remove impurities and crush it, dry it at low temperature, and crush it to obtain blueberry pomace.

[0020] Preferably, the preparation method of the seaweed oligopeptide complex is as follows: chitosan is dissolved in a 1-2% acetic acid solution and stirred until completely dissolved. Then, seaweed oligopeptides are slowly added and stirred at 25-30°C for 30-60 minutes to form a chitosan-encapsulated seaweed oligopeptide complex. After drying, the complex is pulverized to obtain the seaweed oligopeptide complex.

[0021] Preferably, the magnetic iron-based biochar adsorbent is biochar prepared from corn stalks and loaded with nano-iron tetroxide.

[0022] The beneficial effects of the embodiments in this application are as follows:

[0023] (1) The oxytetracycline fermentation waste liquid, kitchen waste and blueberry pomace, and other industrial, agricultural and domestic wastes are treated and utilized in a coordinated manner to turn waste into treasure, which not only reduces the environmental pollution load, but also realizes the transformation of waste.

[0024] (2) By encapsulating and protecting seaweed oligopeptides with chitosan to form a stable complex structure, the photothermal degradation of seaweed oligopeptides during processing and application and their rapid decomposition in the soil are effectively prevented. The total root length, root surface area, number of root tips, plant height, number of leaves and aboveground dry weight of the Chinese cabbage treated with the fertilizer of this application are significantly better than those of the commercially available control, and have excellent rooting and seedling strengthening effects, effectively solving the problem of the single efficacy of existing products.

[0025] (3) Chitosan encapsulates seaweed oligopeptides, delaying their degradation and prolonging their active time; compound amino acids provide fast-acting organic nitrogen, while kitchen waste organic materials and oxytetracycline waste liquid decomposition products provide long-lasting organic matter, achieving a balanced supply of nutrients; seaweed oligopeptides, compound amino acids and polyphenols in blueberry pomace work together to promote root development and enhance crop resistance; oxytetracycline waste liquid, kitchen waste and blueberry pomace are treated in a targeted manner and then compounded for use, realizing a circular economy model of treating waste with waste and turning waste into treasure. Detailed Implementation

[0026] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] The reagents and equipment used in the following examples are all conventional and commercially available.

[0028] Preparation Example 1

[0029] Preparation of magnetic iron-based biochar adsorbent

[0030] (1) Raw material preparation: Corn stalks: Take naturally air-dried corn stalks, remove the leaves and ears, leaving only the stems, and cut them into sections for later use; Ferric oxide precursors: ferric chloride hexahydrate (FeCl3·6H2O) and ferrous sulfate heptahydrate (FeSO4·7H2O), analytical grade.

[0031] (2) Preparation of biochar:

[0032] 1) Wash the corn stalk segments three times with deionized water and dry them in an oven at 80℃ for 24 hours until constant weight is achieved;

[0033] 2) Crush the dried straw and pass it through a 60-mesh sieve to obtain straw powder;

[0034] 3) Place the straw powder in a tube furnace and heat it to 500℃ at a heating rate of 10℃ / min under nitrogen protection, and pyrolyze for 2 hours;

[0035] 4) After naturally cooling to room temperature, remove the corn stalk biochar, grind it through a 100-mesh sieve, and seal it for later use.

[0036] (3) Loading of nano-Fe3O4:

[0037] 1) Weigh 10g of the corn stalk biochar prepared above, disperse it in 200mL of deionized water, and ultrasonically disperse it for 30min to obtain a biochar suspension;

[0038] 2) With a molar ratio of n(Fe³⁺):n(Fe²⁺)=2:1, weigh FeCl3·6H2O and FeSO4·7H2O, dissolve them in 100mL of deionized water, and prepare a mixed iron salt solution;

[0039] 3) Under nitrogen protection, the iron salt mixture solution was slowly added dropwise to the biochar suspension, while the pH of the system was adjusted to 10-11 with 1 mol / L NaOH solution and the mixture was stirred continuously.

[0040] 4) After the addition is complete, continue stirring in a 60℃ water bath for 2 hours to allow Fe3O4 nanoparticles to be uniformly generated and loaded on the surface of biochar.

[0041] 5) After the reaction is complete, the magnetic complex is separated by a magnet and washed with deionized water and anhydrous ethanol until neutral.

[0042] 6) The product was dried in a vacuum drying oven at 60℃ for 12 hours and then ground through a 100-mesh sieve to obtain a magnetic iron-based biochar adsorbent supported on corn straw biochar nano-iron oxide.

[0043] (4) Characterization: According to BET test, the specific surface area can reach 200 m² / g, and it has good adsorption capacity for organic pollutants such as oxytetracycline. In the treatment of oxytetracycline fermentation waste liquid, when the dosage is 5% (mass ratio) and the mixture is stirred at room temperature for 2 hours, the removal rate of oxytetracycline is 88%.

[0044] Preparation Example 2

[0045] Preparation of oxytetracycline waste liquid decomposition products

[0046] (1) Collect the fermentation liquid from the oxytetracycline fermentation workshop, centrifuged clear liquid, bacterial residue pressing liquid, acidified filtration mother liquor, resin regeneration rinsing liquid, and equipment cleaning wastewater, and collect them into a closed collection tank. Stir evenly to obtain mixed oxytetracycline fermentation waste liquid. Take the oxytetracycline fermentation waste liquid and add magnetic iron-based biochar adsorbent at 5% of the waste liquid mass.

[0047] (2) Physical adsorption was carried out by stirring at room temperature for 2 hours to remove residual antibiotics and organic pollutants;

[0048] (3) Add chlorine-resistant compound bacterial agent to the adsorption system, with an inoculum amount of 3% of the total mass of the system;

[0049] (4) Control the temperature at 35~40℃ and ferment in a sealed environment for 5 days to obtain antibiotic inactivation products;

[0050] (5) After solid-liquid separation by plate and frame filtration, the filter cake is dried at 60°C until the moisture content is ≤12%, and then crushed through 80 mesh to obtain the decomposition product of oxytetracycline waste liquid.

[0051] Preparation Example 3

[0052] Preparation of oxytetracycline waste liquid decomposition products

[0053] (1) Collect the fermentation liquid from the oxytetracycline fermentation workshop, centrifuged clear liquid, bacterial residue pressing liquid, acidified filtration mother liquor, resin regeneration rinsing liquid, and equipment cleaning wastewater, and collect them into a closed collection tank. Stir evenly to obtain mixed oxytetracycline fermentation waste liquid. Take the oxytetracycline fermentation waste liquid and add magnetic iron-based biochar adsorbent at 5% of the waste liquid mass.

[0054] (2) Physical adsorption was carried out by stirring at room temperature for 2 hours to remove residual antibiotics and organic pollutants;

[0055] (3) Add chlorine-resistant compound bacterial agent to the adsorption system, with an inoculum amount of 3% of the total mass of the system;

[0056] (4) Control the temperature at 35~40℃ and ferment in a sealed environment for 7 days to obtain antibiotic inactivation products;

[0057] (5) Solid-liquid separation was performed by plate and frame filter press. The filter cake was dried at 60°C until the moisture content was ≤12%, and then crushed through 80 mesh to obtain the decomposition product of oxytetracycline waste liquid.

[0058] Preparation Example 4

[0059] Preparation of blueberry pomace

[0060] (1) Take the remaining pulp from the processing of blueberry juice and remove impurities such as branches, leaves and moldy parts;

[0061] (2) Dry the product using a low-temperature vacuum dryer at 45°C and a vacuum of -0.08MPa until the moisture content is ≤10%;

[0062] (3) Crush and pass through an 80-mesh sieve to obtain blueberry pulp.

[0063] Preparation Example 5

[0064] Preparation of seaweed oligopeptide complex

[0065] (1) Prepare a 1.5% acetic acid solution, add chitosan to it, and stir until completely dissolved. The chitosan concentration is 8%.

[0066] (2) Add the seaweed oligopeptide slowly according to the mass ratio of chitosan to seaweed oligopeptide = 2:1, stir at 30°C for 30 min to form an encapsulated complex.

[0067] (3) Spray drying, with air inlet temperature of 170℃ and air outlet temperature of 75℃, and pulverized through a 100-mesh sieve to obtain chitosan-encapsulated seaweed oligopeptide complex.

[0068] Preparation Example 6

[0069] Preparation of seaweed oligopeptide complex

[0070] (1) Prepare a 1% acetic acid solution, add chitosan to it, and stir until completely dissolved. The chitosan concentration is 8%.

[0071] (2) Add the seaweed oligopeptide slowly according to the mass ratio of chitosan to seaweed oligopeptide = 5:1, and stir at 28℃ for 60 min to form an encapsulated complex.

[0072] (3) Spray drying, with air inlet temperature of 170℃ and air outlet temperature of 75℃, and pulverized through a 100-mesh sieve to obtain chitosan-encapsulated seaweed oligopeptide complex.

[0073] Preparation Example 7

[0074] Preparation of seaweed oligopeptide complex

[0075] (1) Prepare a 2% acetic acid solution, add chitosan to it, and stir until completely dissolved. The chitosan concentration is 8%.

[0076] (2) Add the seaweed oligopeptide slowly according to the mass ratio of chitosan to seaweed oligopeptide = 8:1, stir at 25°C for 45 min to form an encapsulated complex.

[0077] (3) Spray drying, with air inlet temperature of 170℃ and air outlet temperature of 75℃, and pulverized through a 100-mesh sieve to obtain chitosan-encapsulated seaweed oligopeptide complex.

[0078] Preparation Example 8

[0079] Preparation of organic materials from kitchen waste

[0080] (1) Take household kitchen waste and sort it to remove non-degradable impurities such as plastic, metal, and glass;

[0081] (2) Use a grinder to grind the kitchen waste into particles with a diameter of 2-5mm;

[0082] (3) Put the food waste into a fermentation tank and add fermentation agent (Bacillus subtilis and lactic acid bacteria compound) at 0.3% of the weight of the food waste. Control the fermentation temperature to 55~60℃ and ferment aerobically for 7 days. Turn the food waste over once every 12 hours during the fermentation. After the fermentation is completed, let it cool naturally to room temperature to obtain the recycled organic food waste.

[0083] Example 1

[0084] Seaweed Oligopeptide Fertilizer for Rooting and Seedling Strengthening

[0085] (1) Component formulation by weight: 2 parts of seaweed oligopeptide complex in Preparation Example 5, 1 part of seaweed extract, 10 parts of compound amino acid (lysine), 1 part of blueberry pomace, 20 parts of oxytetracycline waste decomposition product in Preparation Example 2, and 30 parts of kitchen waste recycled organic material.

[0086] (2) Preparation method:

[0087] 1) Put the seaweed extract and compound amino acids into a grinder and grind them to 80 mesh, then set aside.

[0088] 2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir at low speed for 10 minutes to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 250 r / min and continue stirring for 15 minutes; finally add seaweed oligopeptide complex and continue stirring for 10 minutes to obtain a uniform mixture.

[0089] 3) Homogenization and refinement: The mixture obtained in step 2) is fed into a homogenizer, and the homogenization pressure is controlled at 20 MPa for 10 min to obtain homogenized material;

[0090] 4) Spray drying granulation: The homogeneous material is fed into a spray dryer with an inlet air temperature of 180℃ and an outlet air temperature of 80℃. After drying and screening, a powder-type seaweed oligopeptide fertilizer for rooting and seedling strengthening is obtained.

[0091] Example 2

[0092] Seaweed Oligopeptide Fertilizer for Rooting and Seedling Strengthening

[0093] (1) Component formulation by weight: 4 parts of seaweed oligopeptide complex in Preparation Example 6, 4 parts of seaweed extract, 20 parts of compound amino acids (10 parts of lysine and 10 parts of methionine), 5 parts of blueberry pomace, 30 parts of oxytetracycline waste decomposition product in Preparation Example 2, and 40 parts of kitchen waste recycled organic material.

[0094] (2) Preparation method:

[0095] 1) Put the seaweed extract and compound amino acids into a grinder and grind them to 80 mesh, then set aside.

[0096] 2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir at low speed for 10 minutes to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 300 r / min and continue stirring for 15 minutes; finally add seaweed oligopeptide complex and continue stirring for 10 minutes to obtain a uniform mixture.

[0097] 3) Homogenization and refinement: The mixture obtained in step 2) is fed into a homogenizer, and the homogenization pressure is controlled at 25 MPa for 5 min to obtain homogenized material;

[0098] 4) Spray drying granulation: The homogeneous material is fed into a spray dryer with an inlet air temperature of 200℃ and an outlet air temperature of 90℃. After drying and screening, a powder-type seaweed oligopeptide fertilizer for rooting and seedling strengthening is obtained.

[0099] Example 3

[0100] Seaweed Oligopeptide Fertilizer for Rooting and Seedling Strengthening

[0101] (1) Component formulation by weight: 6 parts of seaweed oligopeptide complex in Preparation Example 7, 6 parts of seaweed extract, 25 parts of compound amino acids (10 parts of methionine, 10 parts of threonine, and 5 parts of leucine), 8 parts of blueberry pomace, 40 parts of oxytetracycline waste decomposition product in Preparation Example 3, and 50 parts of kitchen waste recycled organic material.

[0102] (2) Preparation method:

[0103] 1) Put the seaweed extract and compound amino acids into a grinder and grind them to 80 mesh, then set aside.

[0104] 2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir at low speed for 10 minutes to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 280 r / min and continue stirring for 15 minutes; finally add seaweed oligopeptide complex and continue stirring for 10 minutes to obtain a uniform mixture.

[0105] 3) Homogenization and refinement: The mixture obtained in step 2) is fed into a homogenizer, and the homogenization pressure is controlled at 30 MPa for 8 min to obtain homogenized material;

[0106] 4) Spray drying granulation: The homogeneous material is fed into a spray dryer with an inlet air temperature of 200℃ and an outlet air temperature of 90℃. After drying and screening, a powder-type seaweed oligopeptide fertilizer for rooting and seedling strengthening is obtained.

[0107] Example 4

[0108] Seaweed Oligopeptide Fertilizer for Rooting and Seedling Strengthening

[0109] (1) Component formulation by weight: 10 parts of seaweed oligopeptide complex in Preparation Example 5, 8 parts of seaweed extract, 30 parts of compound amino acids (10 parts of lysine, 10 parts of threonine, and 10 parts of leucine), 10 parts of blueberry pomace, 50 parts of oxytetracycline waste decomposition product in Preparation Example 3, and 60 parts of kitchen waste recycled organic material.

[0110] (2) Preparation method:

[0111] 1) Put the seaweed extract and compound amino acids into a grinder and grind them to 80 mesh, then set aside.

[0112] 2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir at low speed for 10 minutes to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 280 r / min and continue stirring for 15 minutes; finally add seaweed oligopeptide complex and continue stirring for 10 minutes to obtain a uniform mixture.

[0113] 3) Homogenization and refinement: The mixture obtained in step 2) is fed into a homogenizer, and the homogenization pressure is controlled at 30 MPa for 8 min to obtain homogenized material;

[0114] 4) Water-based fertilizer: Add 2 times the weight of deionized water to the homogeneous material, stir at high speed until completely dissolved, then add pH adjuster (citric acid / potassium dihydrogen phosphate) to adjust the pH of the system to 5.5, filter, and obtain water-based rooting and seedling strengthening seaweed oligopeptide fertilizer.

[0115] Example 5

[0116] Seaweed Oligopeptide Fertilizer for Rooting and Seedling Strengthening

[0117] (1) Component formulation by weight: 5 parts of seaweed oligopeptide complex in Preparation Example 6, 5 parts of seaweed extract, 20 parts of compound amino acids (threonine), 6 parts of blueberry pomace, 35 parts of oxytetracycline waste decomposition product in Preparation Example 3, and 40 parts of kitchen waste recycled organic material.

[0118] (2) Preparation method:

[0119] 1) Put the seaweed extract and compound amino acids into a grinder and grind them to 80 mesh, then set aside.

[0120] 2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir at low speed for 10 minutes to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 280 r / min and continue stirring for 15 minutes; finally add seaweed oligopeptide complex and continue stirring for 10 minutes to obtain a uniform mixture.

[0121] 3) Homogenization and refinement: The mixture obtained in step 2) is fed into a homogenizer, and the homogenization pressure is controlled at 25 MPa for 10 min to obtain homogenized material;

[0122] 4) Water-based fertilizer: Add 2 times the weight of deionized water to the homogeneous material, stir at high speed until completely dissolved, then add pH adjuster (citric acid / potassium dihydrogen phosphate) to adjust the pH of the system to 7.0, filter, and obtain water-based rooting and seedling strengthening seaweed oligopeptide fertilizer.

[0123] Comparative Example 1

[0124] Seaweed Oligopeptide Fertilizer for Rooting and Seedling Strengthening

[0125] (1) Component formulation by weight: 4 parts seaweed powder, 4 parts seaweed extract, 20 parts compound amino acids (10 parts lysine and 10 parts methionine), 5 parts blueberry pomace, 30 parts oxytetracycline waste decomposition product from Preparation Example 2, and 40 parts recycled organic materials from kitchen waste.

[0126] (2) Preparation method:

[0127] 1) Put the seaweed extract and compound amino acids into a grinder and grind them to 80 mesh, then set aside.

[0128] 2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir at low speed for 10 minutes to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 300 r / min and continue stirring for 15 minutes; finally add seaweed powder and continue stirring for 10 minutes to obtain a uniform mixture.

[0129] 3) Homogenization and refinement: The mixture obtained in step 2) is fed into a homogenizer, and the homogenization pressure is controlled at 25 MPa for 5 min to obtain homogenized material;

[0130] 4) Spray drying granulation: The homogeneous material is fed into a spray dryer with an inlet air temperature of 200℃ and an outlet air temperature of 90℃. After drying and screening, a powder-type rooting and seedling strengthening fertilizer is obtained.

[0131] Comparative Example 2

[0132] Seaweed Oligopeptide Fertilizer for Rooting and Seedling Strengthening

[0133] (1) Component formulation by weight: 5 parts of seaweed oligopeptide complex, 5 parts of seaweed extract, 20 parts of compound amino acid (threonine), 6 parts of blueberry pomace, 35 parts of humic acid, and 40 parts of kitchen waste recycled organic material in preparation example 6.

[0134] (2) Preparation method:

[0135] 1) Put the seaweed extract and compound amino acids into a grinder and grind them to 80 mesh, then set aside.

[0136] 2) Mixing: Add the kitchen waste recycled organic material and humic acid to the mixer and stir at low speed for 10 minutes to mix evenly; then add blueberry pulp, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 280 r / min and continue stirring for 15 minutes; finally add seaweed oligopeptide complex and continue stirring for 10 minutes to obtain a uniform mixture.

[0137] 3) Homogenization and refinement: The mixture obtained in step 2) is fed into a homogenizer, and the homogenization pressure is controlled at 25 MPa for 10 min to obtain homogenized material;

[0138] 4) Water-based fertilizer: Add 2 times the weight of deionized water to the homogeneous material, stir at high speed until completely dissolved, then add pH adjuster (citric acid / potassium dihydrogen phosphate) to adjust the pH of the system to 7.0, filter, and obtain water-based rooting and seedling strengthening seaweed oligopeptide fertilizer.

[0139] Comparative Example 3

[0140] Commercially available ordinary seaweed acid compound fertilizer.

[0141] Test case

[0142] bok choy growth experiment

[0143] (1) The rooting and seedling strengthening seaweed oligopeptide fertilizers prepared in Examples 1, 2, 3, 4 and 5 were selected as the experimental group; the control group consisted of Comparative Example 1, Comparative Example 2, Comparative Example 3 and blank control group (no fertilizer was applied, only an equal amount of water was applied).

[0144] (2) The experiment was conducted in a greenhouse, and the test crop was Chinese cabbage, the variety of which was “Shanghai Green”. Pot experiments were conducted, with 3 plants planted in each pot, and 5 replicates were set for each treatment, arranged in a randomized block design.

[0145] (3) Fertilization method: Powder fertilizer is diluted at 1:500 and then applied to the roots; liquid fertilizer is diluted 200 times and then applied to the roots. Fertilize once every 7 days, for a total of 3 times; relevant indicators are measured on the 15th and 30th days after the first fertilization.

[0146] (4) Measurement indicators and methods: The total root length, root surface area and root tip number were measured using a root scanner; plant height, number of leaves and aboveground dry weight were also measured.

[0147] (5) Experimental results: The root growth data of Chinese cabbage is shown in Table 1, and the seedling growth data of Chinese cabbage is shown in Table 2.

[0148] Table 1. Root growth data of Chinese cabbage

[0149] experimental group Total root length (cm) <![CDATA[Root surface area (cm 2 ).]]> Number of root tips (units) Example 1 158.2±6.8 22.4±1.1 298±12.3 Example 2 170.5±7.5 23.6±1.6 312±19.5 Example 3 165.3±7.1 22.9±1.3 329±16.7 Example 4 168.5±5.9 22.7±1.7 334±12.7 Example 5 161.3±6.4 23.6±0.9 307±15.9 Comparative Example 1 142.3±3.4 18.6±1.6 158±14.2 Comparative Example 2 149.5±2.6 17.5±1.2 143±16.8 Comparative Example 3 135.1±5.4 15.2±1.1 146±17.2 Blank control group 110.6±5.1 12.1±1.9 121±12.1

[0150] Table 2 Growth data of Chinese cabbage seedlings

[0151] experimental group Plant height (cm) Number of leaves (pieces) Aboveground dry weight (g / plant) Example 1 14.2±0.6 6.3±1.1 2.6±0.9 Example 2 14.8±0.8 7.2±0.9 2.8±0.2 Example 3 13.7±0.4 6.9±0.7 2.4±0.5 Example 4 15.1±0.9 7.6±0.3 2.9±0.7 Example 5 14.7±1.3 6.7±0.6 2.5±0.6 Comparative Example 1 12.3±0.7 4.6±0.4 1.6±0.8 Comparative Example 2 12.7±0.6 4.9±0.8 1.7±0.7 Comparative Example 3 12.2±0.9 4.2±0.5 1.4±0.3 Blank control group 10.4±1.1 3.5±0.7 1.1±0.4

[0152] As shown in Tables 1 and 2, the seaweed oligopeptide fertilizers prepared in Examples 1-5 were significantly superior to the comparative examples and Comparative Example 3 in promoting root development and aboveground growth of pakchoi. Examples 2 and 4 were particularly outstanding, with significantly higher total root length, root surface area, number of root tips, plant height, number of leaves, and aboveground dry weight than the control groups. Compared with Comparative Example 3, Example 2 showed a 26.2% increase in total root length, a 55.3% increase in root surface area, a 113.7% increase in the number of root tips, and a 21.3% increase in plant height.

[0153] In summary, by synergistically combining seaweed oligopeptide complex with components such as oxytetracycline waste decomposition products and recycled organic materials from kitchen waste, and employing chitosan encapsulation protection technology, the fertilizer's promoting effect on crop root development and seedling growth is significantly enhanced, achieving a synergistic effect of waste resource utilization and fertilizer efficacy; it is significantly effective in promoting crop root growth and seedling vigor, surpassing existing technologies.

[0154] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application. All equivalent changes and improvements made within the scope of this application shall still fall within the patent coverage of this application.

Claims

1. A root-promoting and seedling-strengthening seaweed oligopeptide fertilizer, characterized in that, The rooting and seedling strengthening seaweed oligopeptide fertilizer comprises the following components by weight: 2-10 parts seaweed oligopeptide complex, 1-8 parts seaweed extract, 10-30 parts compound amino acids, 1-10 parts blueberry pomace, 20-50 parts oxytetracycline waste liquid decomposition product, and 30-60 parts kitchen waste recycled organic material.

2. The seaweed oligopeptide fertilizer for promoting root growth and seedling development as described in claim 1, characterized in that, The seaweed oligopeptide complex is a seaweed oligopeptide encapsulated in chitosan.

3. The seaweed oligopeptide fertilizer for promoting root growth and seedling development as described in claim 1, characterized in that, The complex amino acid includes at least one of lysine, methionine, threonine, and leucine.

4. The seaweed oligopeptide fertilizer for promoting root growth and seedling development as described in claim 1, characterized in that, The mass ratio of chitosan to seaweed oligopeptides is 2–8:

1.

5. A production process for a seaweed oligopeptide fertilizer for promoting root growth and seedling development, characterized in that, The production process includes the following steps: (1) Crush the seaweed extract and compound amino acids separately and set aside; (2) Mixing: Add the kitchen waste recycled organic material and oxytetracycline waste liquid decomposition product into the mixer and stir to mix evenly; then add blueberry pomace, seaweed extract and compound amino acids in sequence, adjust the stirring speed to 250-300 r / min and continue stirring; finally add seaweed oligopeptide complex and stir to obtain the mixture. (3) Homogenization and refinement: The mixture obtained in step (2) is fed into a homogenizer, and the homogenization pressure is controlled at 20-30 MPa and the homogenization time is 5-10 min to obtain homogenized material; (4) Granulation: a. Drying and granulation: The homogeneous material is fed into a spray dryer with an inlet air temperature of 180-200℃ and an outlet air temperature of 80-90℃. After drying and screening, a powder-type seaweed oligopeptide fertilizer for rooting and seedling strengthening is obtained. b. Water-based fertilizer: Add the homogeneous material to deionized water and stir until completely dissolved. Then add a pH adjuster to adjust the pH of the system to 5.5-7.

0. Filter to obtain water-based root-promoting and seedling-strengthening seaweed oligopeptide fertilizer.

6. The production process of the seaweed oligopeptide fertilizer for promoting root growth and seedling development as described in claim 5, characterized in that, The preparation process of the kitchen waste recycled organic material is as follows: the kitchen waste is sorted to remove impurities, crushed, and then placed in a fermentation tank, fermentation agent is added, fermentation is carried out, and cooling is performed to obtain the kitchen waste recycled organic material.

7. The production process of a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer as described in claim 5, characterized in that, The preparation method of the oxytetracycline waste liquid decomposition product is as follows: take oxytetracycline fermentation waste liquid, use magnetic iron-based biochar adsorbent for physical adsorption, add chlorine-resistant compound bacteria agent for fermentation to obtain passivation product, and separate the passivation product to obtain oxytetracycline waste liquid decomposition product.

8. The production process of a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer as described in claim 5, characterized in that, The preparation method of the blueberry pomace is as follows: take the pomace remaining after blueberry processing, remove impurities and crush it, dry it at low temperature, and crush it to obtain blueberry pomace.

9. The production process of a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer as described in claim 5, characterized in that, The preparation method of the seaweed oligopeptide complex is as follows: Chitosan is dissolved in a 1-2% acetic acid solution and stirred until completely dissolved. Then, seaweed oligopeptides are slowly added and stirred at 25-30°C for 30-60 minutes to form a complex of chitosan encapsulating seaweed oligopeptides. After drying, the complex is pulverized to obtain the seaweed oligopeptide complex.

10. The production process of a root-promoting and seedling-strengthening seaweed oligopeptide fertilizer as described in claim 7, characterized in that, The magnetic iron-based biochar adsorbent is biochar prepared from corn stalks and loaded with nano-iron tetroxide.