CN116986946A

CN116986946A - Seaweed compound fertilizer and preparation method thereof

Info

Publication number: CN116986946A
Application number: CN202310966083.9A
Authority: CN
Inventors: 丁学东
Original assignee: Henan Huangfudan Fertilizer Technology Co ltd
Current assignee: Henan Huangfudan Fertilizer Technology Co ltd
Priority date: 2023-08-02
Filing date: 2023-08-02
Publication date: 2023-11-03

Abstract

The application discloses a seaweed compound fertilizer and a preparation method thereof, and belongs to the technical field of seaweed compound fertilizers. The application discloses a seaweed compound fertilizer which comprises the following raw materials in parts by weight: 0.5 to 6.0 parts of seaweed extract, 25 to 50 parts of chemical fertilizer, 30 to 70 parts of water and 0.01 to 0.1 part of 3, 4-dihydroxyphenylacetic acid powder. The application adopts a small amount of seaweed extract and 3, 4-dihydroxyphenylacetic acid powder to replace the conventional chemical fertilizer, so that the production cost is reduced, the utilization rate of the conventional chemical fertilizer is improved, the waste of the fertilizer is reduced, the environmental pollution is reduced, the stress resistance of crops is improved, necessary nutrition can be provided for the growth and development of plants, a growth regulator can be provided, and the growth and development of the plants are promoted.

Description

Seaweed compound fertilizer and preparation method thereof

Technical Field

The application belongs to the technical field of seaweed compound fertilizer preparation, and particularly relates to a seaweed compound fertilizer and a preparation method thereof.

Background

Seaweed belongs to lower cryptogamic plants, is a first-class producer of ocean food chains, and has the characteristics of high growth speed, simple structure of seaweed body and strong adaptability to growth environment. The seaweed is a precious whole body, not only can be eaten, but also is an important raw material in the seaweed chemical industry, the pharmaceutical industry and the seaweed gel industry. The seaweed contains a large amount of bioactive components and trace elements which are lacking by terrestrial organisms, so that the seaweed has a huge development and utilization prospect in the fertilizer application field. Before the first stage of the open, people in coastal areas of Europe apply seaweed meal to the farmland, so as to increase the crop yield and reduce the plant diseases and insect pests.

The seaweed fertilizer is prepared by taking large brown algae growing in the sea as raw materials, such as Ascophyllum nodosum, kelp, gulfweed and the like, extracting active ingredients in seaweed by chemical, physical and biological methods, and preparing the seaweed bio-organic fertilizer for providing nutrients for plant growth. As the seaweed contains rich nutrient substances and physiological active substances, the organic active ingredients in the seaweed fertilizer are integrated with nutrient components, antibiotic substances and natural plant hormones, and play an important role in stimulating plant growth. Xu Duosu the seaweed contains high level plant endogenous hormone, and the liquid, solid fertilizer, crop yield increasing agent and stress resisting agent prepared from the seaweed or seaweed extract have obvious application effects on grain crops, fruits, vegetables, flowers and the like.

For example, prior art CN 102503705B (a melt granulated green seaweed compound fertilizer and a method for preparing the same) discloses the following: the concentrated seaweed extract is prepared from urea, potassium sulfate, monoammonium phosphate, filler and seaweed concentrated extract, and is prepared by heating, mixing, granulating and cooling. The product has the advantages of natural green pollution-free property, good yield increasing effect and the like. However, the production method is complex, the content of the components is complex, and the activity of certain components in the seaweed extract is destroyed even at high temperature in the preparation process, so that the extracted seaweed extract has poor effect, large usage amount and unreasonable resource usage.

Therefore, the method for searching the seaweed resource which can reasonably utilize seaweed resources, improve the activity and the utilization efficiency of seaweed extract and reduce the production cost is a technical problem which needs to be solved in the field.

Disclosure of Invention

Aiming at the defects of the prior art, the application provides the seaweed compound fertilizer and the preparation method thereof, which are based on the existing chemical fertilizer, and the seaweed extract and the 3, 4-dihydroxyphenylacetic acid powder are matched with each other, so that the fertilizer efficiency can be improved under the condition of low consumption; meanwhile, nano bubbles are supported and dispersed in the compound fertilizer, so that the fertilization efficiency and fertilization effect are improved, and the root system development of crops is promoted.

In a first aspect, the application provides a seaweed compound fertilizer, which comprises the following raw materials in parts by weight:

0.5 to 6.0 parts of seaweed extract, 25 to 50 parts of chemical fertilizer, 30 to 70 parts of water and 0.01 to 0.1 part of 3, 4-dihydroxyphenylacetic acid powder.

Further, the material comprises the following raw materials in parts by weight: 1.0 to 2.0 parts of seaweed extract, 25 to 30 parts of chemical fertilizer, 50 to 70 parts of water and 0.01 to 0.1 part of 3, 4-dihydroxyphenylacetic acid powder.

Further, the material comprises the following raw materials in parts by weight: 1.9 parts of seaweed extract, 28 parts of chemical fertilizer, 70 parts of water and 0.1 part of 3, 4-dihydroxyphenylacetic acid powder.

Further, the seaweed extract is prepared by the following method:

pulverizing seaweed raw material into powder, adding water to obtain slurry;

and uniformly mixing the slurry with an organic solvent and a compound enzyme preparation, and performing enzymolysis to obtain the modified starch.

Further, the organic solvent is one or more than two of ethanol, diethyl ether, methanol and ethyl acetate in any proportion, and the compound enzyme preparation is at least two of pectase, cellulase, lyase and oxidoreductase.

Further, the chemical fertilizer comprises one or a combination of nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, micro-fertilizer and compound fertilizer.

Further, the water exists in the seaweed compound fertilizer in the form of bubbles, preferably nanobubbles, with a diameter of less than 1 μm.

In a second aspect, the application provides a preparation method of the seaweed compound fertilizer in any one of the first aspects, comprising the following steps:

mixing seaweed extract with water, placing in a micro-nano bubble generating device, and uniformly dispersing to obtain a liquid mixture;

heating and stirring chemical fertilizer and 3, 4-dihydroxyphenylacetic acid powder uniformly, and cooling to obtain a solid mixture;

adding the solid mixture into a micro-nano bubble generating device, and uniformly dispersing to obtain the nano-nano bubble generating material.

Further, the heating temperature is 50-70 ℃, the stirring speed is 500-2000 rpm, and the stirring time is 30-60 min.

Further, the dispersing time is 5-8 hours.

Compared with the prior art, the technical scheme provided by the embodiment of the application has at least the following advantages:

1. the seaweed compound fertilizer disclosed by the application is characterized in that seaweed extract and 3, 4-dihydroxyphenylacetic acid powder are added on the basis of the existing chemical fertilizer, so that the fertilizer efficiency is improved. The seaweed extract has the advantages of small usage amount, high nutrient content, promotion of formation of soil aggregate structure, improvement of the pore space in soil, coordination of the solid, liquid and gas proportion in soil, restoration of natural colloid balance lost due to excessive soil load and chemical pollution, increase of soil biological activity, promotion of release of available nutrients, contribution to root growth and improvement of stress resistance of crops. The inventor of the application surprisingly found that after 3, 4-dihydroxyphenylacetic acid powder is mixed with seaweed extract, the fertilizer utilization rate of chemical fertilizer can be effectively improved, the fertilizer waste is reduced, the environmental pollution is reduced, the stress resistance of crops is improved, and the functions of regulating the growth of the crops and improving the quality and the yield of the crops are achieved.

2. In the production process, a micro-nano bubble generating device is used for producing equipment, and firstly, seaweed extract and water are dispersed and mixed in the device, so that the effective components in the seaweed extract are fully wrapped by micro-nano bubbles; and then uniformly mixing the solid raw materials, and dispersing the solid raw materials and bubbles in the device to ensure that the bubbles are stably and fully filled in the whole seaweed compound fertilizer, so that the seaweed compound fertilizer can be ensured to convey oxygen in the bubbles to plants after being applied, and meanwhile, the effective components in the wrapped seaweed extract are directly conveyed to the plants, so that the utilization rate is improved, and the effective components can be stably stored for a long time.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.

In the application, the seaweed extract can be extracted by adopting the method of the application, and can also be directly purchased from the market. The preparation method does not influence the compounding effect of the organic fertilizer and the 3, 4-dihydroxyphenylacetic acid powder, and only influences the content of the active ingredients. Compared with the prior art, the method can reduce the reaction cost, reduce the loss of active ingredients and save the process flow.

The seaweed extract of the application has the following effects:

(1) The seaweed extract contains various plant endogenous hormones such as cytokinin, auxin and the like, which is beneficial to promoting the growth of root systems; meanwhile, the seaweed extract can also improve the absorption of root systems to several elements and transfer the elements to overground parts; the expression of a related gene, namely a nitrate transporter gene NRT1.1, is regulated and controlled, so that the absorption and transportation of nitrogen elements by a root system are promoted, and the absorption of nutrients by the root system is promoted.

(2) Promote the improvement of overground part plant height, leaf number and leaf area, improve chlorophyll content and promote photosynthesis.

(3) The seaweed extract can improve the content of cytokinin, further induce and improve the flowering number and fruit setting rate of crops, promote the fruit expansion and induce the fruit to mature in advance.

(4) The seaweed extract contains various functional substances related to stress resistance, such as betaine, mannitol, proline and the like, which can enhance the tolerance of crops to stress; under adverse stress, the seaweed extract can improve the content of soluble sugar and the activity of SOD enzyme, and reduce the damage of free radicals to cell membranes; inducing crops to produce stress defenses, increasing the activity of various enzymes and increasing the content of phenols.

In the application, chemical fertilizer, short chemical fertilizer. A fertilizer containing one or more nutrient elements required for the growth of crops is prepared by chemical and/or physical methods. The chemical fertilizer has simple components and high nutrient content; the fertilizer efficiency is fast, and the fertilizer strength is strong. The chemical fertilizer in the application is generally a conventional commercial fertilizer and can be selected according to the applied object. It is well known that the use of fertilizers causes certain environmental pollution, increases heavy metals or toxic elements in crops, and also can cause the aggravation of land acidification, soil hardening and nutrient imbalance. Therefore, the application reduces the dosage of the existing fertilizer, improves the fertilizer efficiency by the action of a small amount of seaweed fertilizer and 3, 4-dihydroxyphenylacetic acid powder, further increases the yield and quality of agriculture, reduces the cost, is green and environment-friendly, and has no public nuisance and pollution.

In the application, 3, 4-dihydroxyphenylacetic acid powder is a substance which is discovered accidentally in the experimental process of the inventor and can improve the fertilizer efficiency, is generally used as a medical intermediate, but is synergistic with other components in the application, can promote the growth of plant root systems, can improve the lodging resistance effect of plants, can inhibit bacteria, resist viruses and expel insects, and has an enhancement effect on improving the yield and the quality of plants. The structural formula is as follows:

In some specific embodiments of the application, the seaweed compound fertilizer comprises the following raw materials in parts by weight:

0.5 part of seaweed extract, 25 parts of chemical fertilizer, 70 parts of water and 0.1 part of 3, 4-dihydroxyphenylacetic acid powder;

or seaweed extract 1.0 part, chemical fertilizer 30 parts, water 60 parts and 3, 4-dihydroxyphenylacetic acid powder 0.05 part;

or seaweed extract 2.0 parts, chemical fertilizer 45 parts, water 50 parts and 3, 4-dihydroxyphenylacetic acid powder 0.01 parts;

or seaweed extract 3.0 parts, chemical fertilizer 50 parts, water 45 parts and 3, 4-dihydroxyphenylacetic acid powder 0.1 parts;

or 5.0 parts of seaweed extract, 45 parts of chemical fertilizer, 50 parts of water and 0.02 part of 3, 4-dihydroxyphenylacetic acid powder;

or 6.0 parts of seaweed extract, 30 parts of chemical fertilizer, 52 parts of water, 0.05 part of 3, 4-dihydroxyphenylacetic acid powder and the like.

In the most preferred embodiment of the application, the seaweed compound fertilizer comprises the following raw materials in parts by weight: 1.9 parts of seaweed extract, 28 parts of chemical fertilizer, 70 parts of water and 0.1 part of 3, 4-dihydroxyphenylacetic acid powder. In the proportion range, the seaweed compound fertilizer has the highest fertilizer efficiency and can greatly improve the yield of plants.

Further, the seaweed extract is prepared by the following method:

pulverizing seaweed raw material into powder, sieving with 80-1000 mesh sieve, adding 3-5 times of water to obtain slurry;

In the application, the seaweed cells are treated by adopting an organic solvent to make the cells digested or the endogenous substances solubilized, then enzyme is added into seaweed slurry, and the components such as protein, polysaccharide, pectin, cellulose and the like in the seaweed cell walls are degraded into small molecular substances which are easy to be absorbed and utilized by plants, so that the cell contents are released. The whole reaction condition is mild, the reaction can be carried out at normal temperature, and the activity of active ingredients in the seaweed extract is not destroyed.

In some specific embodiments of the present application, the organic solvent is one or more than two of ethanol, diethyl ether, methanol and ethyl acetate in any proportion, and the complex enzyme preparation is at least two of pectase, cellulase, lyase and oxidoreductase.

Wherein the mass ratio of the organic solvent, the complex enzyme preparation and the slurry is 100-200:0.01-0.5:50-100. The enzymolysis temperature is 35-55 ℃, and the enzymolysis time is 4-8 h. After enzymolysis, the extracting solution can be subjected to conventional enzyme inactivation treatment and filtered to obtain seaweed extracting solution. The seaweed extract obtained by the application contains alginic acid, seaweed polysaccharide, auxin, cytokinin, gibberellin, brassinolide, polyamine and the like.

In the present application, the seaweed material may be dried kelp and/or dried soaked seaweed, etc.

In some specific embodiments of the present application, the chemical fertilizer comprises any one or any mixed mixture of nitrogen fertilizer, phosphate fertilizer, potash fertilizer, micro fertilizer and compound fertilizer. The chemical fertilizers are adjusted according to the actual production requirement, and all chemical fertilizers can be obtained through commercial channels.

In some specific embodiments of the application, the water is present in the seaweed compound fertilizer in the form of bubbles, preferably nanobubbles, having a diameter of less than 1 μm.

mixing seaweed extract and water, placing the seaweed extract and water in a micro-nano bubble generating device, and dispersing for 5-8 hours until the seaweed extract and the water are uniformly dispersed to prepare a liquid mixture;

heating chemical fertilizer and 3, 4-dihydroxyphenylacetic acid powder to 50-70 ℃, stirring for 30-60 min at 500-2000 rpm until stirring uniformly, and cooling to obtain a solid mixture;

adding the solid mixture into a micro-nano bubble generating device, and dispersing for 5-8 hours until the solid mixture is uniform, thus obtaining the nano-nano bubble.

It can be understood that the compound fertilizer is a liquid fertilizer, so that the application and the preservation are convenient, and meanwhile, the preservation of the compound fertilizer is a shade place, so that the high-temperature insolation is avoided.

The principles and features of the present application are described below in connection with the following examples, which are set forth to illustrate, but are not to be construed as limiting the scope of the application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention. For example, the micro-nano bubble generating device in the following examples of the present application is commercially available from the company ltd of the family trioxygen purification device in peninsula.

The chemical fertilizer used in the following examples of the application is a potassium sulfate compound fertilizer purchased from Yunnan Cheng Co., ltd, wherein N-P ₂ O ₅ -K ₂ O is 15-15-15% and total nutrient is not less than 45%.

The specific dosage relation of each component is as follows:

component one: 1.9 parts of seaweed extract, 28 parts of chemical fertilizer, 70 parts of water and 0.1 part of 3, 4-dihydroxyphenylacetic acid powder (applied to example 1).

And a second component: 1.0 part of seaweed extract, 30 parts of chemical fertilizer, 60 parts of water and 0.05 part of 3, 4-dihydroxyphenylacetic acid powder (applied to example 2).

And (3) a third component: 5.0 parts of seaweed extract, 45 parts of chemical fertilizer, 50 parts of water and 0.02 part of 3, 4-dihydroxyphenylacetic acid powder (applied to example 3).

Example 1

The embodiment discloses a seaweed compound fertilizer, which is prepared by the following steps:

pulverizing seaweed raw material into powder, sieving with 200 mesh sieve, adding 5 times of water to obtain slurry;

uniformly mixing the slurry with an organic solvent and a compound enzyme preparation, and performing enzymolysis to obtain seaweed extract;

mixing seaweed extract with water, placing in a micro-nano bubble generating device, and dispersing for 8 hours until the seaweed extract is uniformly dispersed to obtain a liquid mixture;

heating chemical fertilizer and 3, 4-dihydroxyphenylacetic acid powder to 50 ℃, stirring for 30min at 2000rpm until stirring uniformly, and cooling to obtain a solid mixture;

adding the solid mixture into a micro-nano bubble generating device, and dispersing for 8 hours until the solid mixture is uniform, thus obtaining the nano-nano bubble generating device.

The organic solvent is ethanol, and the compound enzyme preparation comprises pectase, cellulase, lyase and oxidoreductase with equal mass.

Wherein the mass ratio of the organic solvent to the complex enzyme preparation to the slurry is 100:0.5:50.

Example 2

obtaining seaweed extract from Shanxi hucho taimen biotechnology limited company, obtaining seaweed extract from China/Hebei mountain hua-hook biotechnology limited company, and uniformly mixing the seaweed extract in a proper proportion to obtain seaweed extract sold in the market;

mixing seaweed extract with water, placing in a micro-nano bubble generating device, and dispersing for 6 hours until the seaweed extract is uniformly dispersed to obtain a liquid mixture;

heating chemical fertilizer and 3, 4-dihydroxyphenylacetic acid powder to 70 ℃, stirring at 2000rpm for 60min until stirring uniformly, and cooling to obtain a solid mixture;

adding the solid mixture into a micro-nano bubble generating device, and dispersing for 6 hours until the solid mixture is uniform, thus obtaining the nano-nano bubble generating device.

The organic solvent is ethanol and ethyl acetate with equal mass, and the compound enzyme preparation is pectase, cellulase, lyase and oxidoreductase with equal mass.

Wherein the mass ratio of the organic solvent to the complex enzyme preparation to the slurry is 200:0.5:50.

Example 3

pulverizing seaweed raw material into powder, sieving with 800 mesh sieve, adding 3 times of water to obtain slurry;

mixing seaweed extract with water, placing in a micro-nano bubble generating device, and dispersing for 5 hours until the seaweed extract is uniformly dispersed to obtain a liquid mixture;

adding the solid mixture into a micro-nano bubble generating device, and dispersing for 5 hours until the solid mixture is uniform, thus obtaining the nano-nano bubble generating device.

The organic solvent is methanol and ethyl acetate with equal mass, and the compound enzyme preparation is pectase, cellulase, lyase and oxidoreductase with equal mass.

Wherein the mass ratio of the organic solvent to the complex enzyme preparation to the slurry is 100:0.01:100.

Comparative example 1

The comparative example discloses a seaweed compound fertilizer, which comprises the following raw materials in parts by weight:

1.9 parts of seaweed extract, 28 parts of chemical fertilizer and 70 parts of water. The preparation method is the same as in example 1.

Comparative example 2

The comparative example discloses a compound fertilizer which comprises the following raw materials in parts by weight:

28 parts of chemical fertilizer, 70 parts of water and 0.1 part of 3, 4-dihydroxyphenylacetic acid powder. The preparation method is the same as in example 1.

Comparative example 3

The comparative example discloses a seaweed compound fertilizer, which has the same raw material composition and proportion as in example 1, and the preparation method comprises the following steps:

mixing the seaweed extract with water to obtain a mixed solution;

and uniformly mixing the solid mixture with the mixed solution to obtain the composite material.

Comparative example 4

placing the water into a micro-nano bubble generating device, and dispersing for 8 hours to obtain nano bubble water;

mixing the solid mixture, seaweed extract and nano bubble water uniformly.

Test example 1-determination of peanut seedling Rate by indoor Small cup method

Peanut emergence rate test is carried out in a laboratory for 2023, 5 and the last ten days. The test temperature was constant at 25 ℃, seven treatments were tested, each treatment set up with three replicates of 10 pots each. The dosage of each treated medicament is 10mL/30 jin of peanut seeds, 200g of seeds are mixed in each treatment, the dosage is 0.4mL, and the mixture is uniformly mixed and dried for standby. Before sowing, selecting full peanut seeds with consistent size, and inserting the peanut seeds into small cups (specification: diameter: height: 8.5 cm: 12 cm). The seedlings were cultivated in a laboratory light incubator at 25℃for 7 days, and the results are shown in Table 1.

Table 1 peanut emergence rate test results

Group of	Emergence rate of seedlings
		Example 1	97.89％
Example 2	95.04％
		Example 3	96.70％
Comparative example 1	82.32％
		Comparative example 2	80.41％
Comparative example 3	86.78
		Comparative example 4	90.45％

As can be seen from Table 1, the seaweed compound fertilizer disclosed by the application can obviously improve the emergence rate of peanuts.

Test example 2 maize rooting experiment

The seedling raising is carried out in a certain laboratory seedling raising basin, and each basin is provided with 20 corn seedlings, and 14 basins are used. Seven groups of experiments are arranged in total, the seaweed compound fertilizers prepared in examples 1-3 are experimental groups, the compound fertilizers prepared in comparative examples 1-4 are control groups, the compound fertilizers are diluted 500 times respectively, corn seeds are soaked in a diluent for 10 hours, taken out and dried after 10 hours, transplanted into a seedling pot with seedling substrates for 10 days of growth, and root length, root surface area, root fresh weight and root dry weight of the grown corn are measured, and the results are shown in table 2.

TABLE 2 corn rooting test results

From the table, the root length of the corn seedling grown after germination of the corn seeds treated by the seaweed compound fertilizer disclosed by the application is 35-41 cm, and the root length of the corn seedling grown after germination of the corn seeds treated by the compound fertilizer disclosed by the comparative examples 1-4 is 25cm, and the seaweed compound fertilizer formula and the preparation method disclosed by the application have very important influence on the fertilizer efficiency of the seaweed compound fertilizer, for example, can promote rooting of corn seedlings and root growth, and are further beneficial to nutrient absorption of corn seedlings.

Test example 3-experiment for growing chinese cabbage

The cultivation is carried out in a certain laboratory seedling raising basin, and each basin is provided with 20 seedlings of Chinese cabbage, and 14 basins are provided. Seven groups of experiments are arranged in total, the seaweed compound fertilizers prepared in examples 1-3 are experimental groups, the compound fertilizers prepared in comparative examples 1-4 are control groups, the compound fertilizers are diluted 500 times respectively, when the cabbages grow to form three leaves and one heart, root irrigation treatment is carried out, the root irrigation treatment is carried out for 15 days at intervals, the total time is 3 times, and the seedling growth results including plant height, leaf area, chlorophyll value and fresh weight are recorded, wherein the results are shown in table 3.

TABLE 3 growth results of pakchoi

	Plant height/cm	Leaf area/cm ²	Fresh weight/g	Chlorophyll value
					Example 1	16.22	345.69	115.78	39.45
Example 2	14.79	320.41	105.58	34.74
					Example 3	15.88	324.80	110.79	37.45
Comparative example 1	12.10	278.92	90.60	30.56
					Comparative example 2	9.50	259.78	79.75	23.48
Comparative example 3	11.02	300.14	94.58	32.10
					Comparative example 4	12.98	314.69	100.04	33.64

As can be seen from the table, the seaweed compound fertilizer disclosed by the application can promote the growth of crop leaves, and has an obvious effect of promoting the growth of crop seedlings.

Test example 4-Effect on cucumber quality

The test is carried out in a sunlight greenhouse, and the cultivation mode is traditional furrow cultivation, wherein the furrow width is 1.5m, the furrow length is 8m, and the plant spacing is 40cm. Using cell test, each cell was 4 furrows, cell area was 1.5m×8m×4=48m ² . The test set 7 treatments, each treatment repeated three times, as in test examples 1-3, with a random block arrangement. The fertilizer is diluted by 100 times and is irrigated in furrow, and is applied by base fertilizer and additional fertilizer for 3 times, and the conventional dosage is N, P ₂ O ₅ 、K ₂ O meters are respectively 450 kg/hm, 225 kg/hm and 600kg/hm ² Metering.

The detection method comprises the following steps: fresh fruits are sampled in the full bearing period, and the quality index vitamin C (2, 6-dichloro indophenol titration method) is measured. The results are shown in Table 4.

TABLE 4 Experimental results of cucumber quality

	Vitamin C (g/100 g)
		Example 1	8.5±0.1
Example 2	7.8±0.3
		Example 3	8.1±0.2
Comparative example 1	7.2±0.1
		Comparative example 2	6.5±0.2
Comparative example 3	7.0±0.2
		Comparative example 4	7.3±0.1

In conclusion, the seaweed compound fertilizer disclosed by the application has promotion effects on plant growth stages including germination, rooting, root growth, leaf development and the like, and specifically, can break seed dormancy, promote seed germination and root growth, and obviously increase crop yield and quality.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The seaweed compound fertilizer is characterized by comprising the following raw materials in parts by weight:

2. The seaweed compound fertilizer of claim 1, comprising the following raw materials in parts by weight: 1.0 to 2.0 parts of seaweed extract, 25 to 30 parts of chemical fertilizer, 50 to 70 parts of water and 0.01 to 0.1 part of 3, 4-dihydroxyphenylacetic acid powder.

3. The seaweed compound fertilizer of claim 2, comprising the following raw materials in parts by weight: 1.9 parts of seaweed extract, 28 parts of chemical fertilizer, 70 parts of water and 0.1 part of 3, 4-dihydroxyphenylacetic acid powder.

4. A seaweed compound fertilizer as claimed in any one of claims 1 to 3, characterized in that said seaweed extract is prepared by the following method:

pulverizing seaweed raw material into powder, adding water to obtain slurry;

5. The seaweed compound fertilizer of claim 4, wherein the organic solvent is one or more of ethanol, diethyl ether, methanol and ethyl acetate, and the complex enzyme preparation is at least two of pectase, cellulase, lyase and oxidoreductase.

6. The seaweed compound fertilizer of claim 1, wherein the chemical fertilizer comprises any one or a combination of a nitrogen fertilizer, a phosphorus fertilizer, a potassium fertilizer, a micro fertilizer, and a compound fertilizer.

7. The seaweed compound fertilizer of claim 1, wherein the water is present in the seaweed compound fertilizer in the form of bubbles, the bubbles having a diameter of less than 1 μm.

8. A method for preparing the seaweed compound fertilizer as claimed in any one of claims 1 to 7, characterized by comprising the following steps:

9. The method for preparing a seaweed compound fertilizer according to claim 8, wherein the heating temperature is 50-70 ℃, the stirring speed is 500-2000 rpm, and the stirring time is 30-60 min.

10. The method for preparing a seaweed compound fertilizer according to claim 8, wherein the dispersing time is 5-8 hours.