High-activity liquid fertilizer as well as preparation method and application thereof

Abstract

The invention discloses a high-activity liquid fertilizer as well as a preparation method and application thereof. The high-activity liquid fertilizer is prepared from the following raw materials in parts by mass: 20 to 30 parts of urea, 8 to 12 parts of potassium sulfate, 10 to 15 parts of water-soluble phosphate fertilizer and 1 to 2 parts of trace element fertilizer. The water-soluble phosphate fertilizer is prepared from a papermaking black liquid high-activity extract and dihydrogen phosphate, the trace element fertilizer is composed of an algae high-activity extract and trace elements. According to the method, phenolic substances and organic alkaline substances are added into the papermaking black liquid, effective breakage of C-C bonds is realized by utilizing substances such as potassium tert-butoxide, sodium tert-butoxide and sodium ethoxide, and repolymerization of degradation products is effectively inhibited by adding substances such as phenol and cresol, so that the high-activity extract of the papermaking black liquid is obtained; aiming at algae organisms, after acid treatment, ammonium sulfite and ammonia water continue to react under the high-temperature and high-pressure conditions, so that the high-activity algae extract rich in sulfonic groups is prepared, and the prepared high-activity liquid fertilizer does not generate precipitates after being stored for 180 days under the low-temperature (4 DEG C) condition.

Description

Technical Field

[0001] The present invention relates to the technical field of resource reuse, and particularly relates to a highly active liquid fertilizer, a preparation method thereof, and an application thereof. Background Art

[0002] Liquid fertilizers have been widely used in agricultural production due to their flexible formulations, precise application, and diverse functions. Developing compound liquid fertilizers with comprehensive nutrients to meet the needs of crops for various nutrients is an important direction for the development of the industry. Through investigation, it is found that the phosphorus content in liquid fertilizers on the market is generally low, and long-term application will cause phosphorus deficiency in plants. The main reason is that phosphate ions are prone to precipitate with metal ions (such as Ca 2+ , Mg 2+ , etc.), making it difficult for plants to absorb and utilize, and greatly reducing their effectiveness. In addition, after long-term storage, due to the reduced stability of the liquid fertilizer system, flocculation or precipitation is likely to occur, significantly reducing its application effect. Therefore, how to improve the stability of phosphorus-containing liquid fertilizers, reduce the formation of precipitates, and prepare water-soluble fertilizers with comprehensive nutrients is the key to solving the problem.

[0003] Ammonium sulfite papermaking black liquor has been developed and utilized to prepare a type of highly active fertilizer synergist that can replace natural fulvic acid because it has a similar chemical structure to natural fulvic acid and its source is continuous and stable. However, due to the relatively large molecular weight and low content of active functional groups of this papermaking black liquor, its application effect is reduced to a certain extent. Modifying it to reduce its molecular weight and increase the content of functional groups, such as carboxyl groups and phenolic hydroxyl groups, is of great value for the efficient utilization of papermaking black liquor. The overgrowth of seaweeds caused by nutrient surplus harms the marine environment. Using them as fertilizer synergists in agricultural production is one of the effective means to realize their reuse. However, the salts remaining on their surfaces may provide a salt stress environment for plants. In addition, how to fully utilize seaweed substances and enhance their physiological activity is of great significance for alleviating the pressure on the marine environment.

[0004] Patent CN109896896A discloses a liquid fertilizer for improving the drought tolerance of rice and its application method, which includes 35 - 50 parts of nitrogen fertilizer calculated as N, 60 - 80 parts of phosphate fertilizer calculated as P2O5, 40 - 60 parts of potassium fertilizer calculated as K2O, 10 - 20 parts of soluble silicon, 2 - 5 parts of nitrification inhibitor, and 800 - 1000 parts of water. It can effectively solve problems such as the interaction between water and nitrogen and the low water and nitrogen utilization efficiency in current rice fertilizers. However, in addition to nitrogen, phosphorus, and potassium elements, it only contains trace element silicon, and the nutrient coverage is not comprehensive enough. Patent CN104151092A discloses a production method of an organic water-soluble liquid fertilizer. After anaerobic fermentation of the fertilizer stock solution by mixing yeast and lactic acid bacteria in the presence of a biological filler, bacillus licheniformis is added, and rare earth nitrate for agriculture, boron fertilizer, zinc fertilizer, and molybdenum fertilizer are added. Then, aeration is carried out, and after aerobic fermentation, liquid chitin is added and stirred evenly to obtain the organic water-soluble liquid fertilizer. It prepares the liquid fertilizer by adding rare earth nitrate and borax, but does not solve the problem that the liquid fertilizer is prone to precipitation during long-term storage. Summary of the Invention

[0005] In view of the above-mentioned prior art, the object of the present invention is to provide a highly active liquid fertilizer, its preparation method, and application.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect of the present invention, a highly active liquid fertilizer is provided, which is composed of the following raw materials in parts by mass:

[0008] 20 - 30 parts of urea, 8 - 12 parts of potassium sulfate, 10 - 15 parts of water-soluble phosphate fertilizer, and 1 - 2 parts of trace element fertilizer;

[0009] The water-soluble phosphate fertilizer is composed of a highly active extract of paper-making black liquor and dihydrogen phosphate in a mass ratio of (1 - 3):(1 - 3);

[0010] The trace element fertilizer is composed of a highly active extract of algae and trace elements in a mass ratio of (2 - 5):(0.36 - 1.05).

[0011] Preferably, the highly active extract of paper-making black liquor is prepared by the following method:

[0012] Phenolic substances and organic basic substances are added to paper-making black liquor to obtain a mixed solution; under a nitrogen atmosphere, the reaction is carried out at 60 - 70 °C for 40 - 60 min to obtain the highly active extract of paper-making black liquor.

[0013] Preferably, the mass ratio of paper-making black liquor to phenolic substances is (1 - 3):1, and in the mixed solution, the concentration of the organic basic substance is 6 - 10 mmol / L.

[0014] Preferably, the phenolic substance is one or more of phenol and cresol.

[0015] Preferably, the organic basic substance is one or more of sodium tert-butoxide, potassium tert-butoxide, and sodium ethoxide.

[0016] Preferably, the highly active algal extract is prepared by the following method:

[0017] Add acid to seaweed powder and react with shaking at 20 - 50 °C and 100 - 300 rpm for 8 - 14 h. After the reaction, wash and filter to obtain a precipitate; add ammonium sulfite and ammonia water to the precipitate and react at 150 - 250 °C and 0.1 - 0.3 mPa for 100 - 120 min. After the reaction, filter to obtain the highly active algal extract.

[0018] Preferably, the acid is citric acid, hydrochloric acid, or sulfuric acid; among them, the mass percentage of citric acid is 2% - 4%, the concentration of hydrochloric acid is 0.1 - 0.3 mol / L, and the concentration of sulfuric acid is 0.05 - 0.15 mol / L.

[0019] Preferably, the ratio of the addition amount of seaweed powder to acid is 1 g : (8 - 12) mL; the ratio of the addition amount of the precipitate, ammonium sulfite, and ammonia water is 10 g : (1 - 3) g : (0.05 - 0.15) mL, and the mass fraction of ammonia water is 25% - 35%.

[0020] Preferably, the seaweed powder is obtained by drying and grinding one or more of kelp, sargassum, wakame, and ulva lactuca.

[0021] Preferably, the trace elements are composed of manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate, and AC-Fe in a mass ratio of (0.1 - 0.5) : (0.05 - 0.1) : (0.05 - 0.1) : (0.05 - 0.1) : (0.01 - 0.05) : (0.1 - 0.2).

[0022] In the second aspect of the present invention, there is provided the application of the above-mentioned highly active liquid fertilizer in at least one of the following (1) - (3):

[0023] (1) Promote the yield increase of food crops;

[0024] (2) Promote the early flowering of flower crops;

[0025] (3) Prolong the flowering period of flower crops.

[0026] Advantages of the present invention:

[0027] 1. The present invention adds phenolic substances and organic alkaline substances to paper-making black liquor, uses substances such as potassium tert-butoxide, sodium tert-butoxide, and sodium ethoxide to effectively break C-C bonds, and effectively inhibits the repolymerization of degradation products by adding substances such as phenol and cresol, thereby obtaining a highly active extract of paper-making black liquor; for algae organisms, the present invention uses acid treatment and then reacts with ammonium sulfite and ammonia under high temperature and high pressure conditions to prepare a highly active extract of algae rich in sulfonic acid groups. The present invention improves the water solubility of the liquid fertilizer by adding the highly active extract of paper-making black liquor and the highly active extract of algae. The test results show that the highly active liquid fertilizers prepared in Examples 1-3 did not produce precipitation after being stored at low temperature (4°C) for 180 days, verifying its excellent stability.

[0028] 2. The highly active liquid fertilizer of the present invention is applied to food crops and flowers, which can promote the yield increase of food crops and promote the early flowering and extended flowering period of flower crops. Brief Description of the Drawings

[0029] Figure 1 : Pictures of the liquid fertilizers prepared in Examples 1-3 and the fertilizers prepared in Comparative Examples 1-3 stored under low temperature conditions;

[0030] Figure 2 : The influence of the fertilizers prepared in Examples 1-3 and Comparative Example 3 on the flowering of carnations. Detailed Description of the Invention

[0031] It should be noted that the following detailed description is illustrative and aims to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0032] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below in combination with specific examples.

[0033] The test materials used in the embodiments of the present invention are all conventional test materials in the art and can be obtained through commercial channels.

[0034] The paper-making black liquor is the wastewater generated in the alkaline pulping process of the paper-making industry. In the present application, the paper-making black liquor is purchased from Shandong Quanlin Group Co., Ltd., and its solid content is measured to be 70%.

[0035] Example 1: Preparation of Highly Active Liquid Fertilizer

[0036] (1) Preparation of water-soluble phosphate fertilizer: Cresol and sodium tert-butoxide are added to paper-making black liquor to obtain a mixed solution; the mass ratio of cresol to paper-making black liquor is 2:1, and the concentration of sodium tert-butoxide in the mixed solution is 6 mmol / L; nitrogen is introduced and the reaction is carried out for 40 min under the condition of a 65°C water bath to obtain a highly active extract of paper-making black liquor;

[0037] The highly active extract of paper-making black liquor and ammonium dihydrogen phosphate are dissolved and blended in a mass ratio of 1:1 to obtain water-soluble phosphate fertilizer;

[0038] (2) Preparation of trace element fertilizer: Kelp and sargassum are dried and ground, and then mixed in a mass ratio of 1:1 to obtain seaweed powder. 10 ml of 0.2 mol / L hydrochloric acid is added to each gram of seaweed powder, and the mixture is shaken overnight at 40°C and 200 rpm. After filtration and washing, ammonium sulfite and ammonia water are added to the residue. 2 g of ammonium sulfite and 0.1 ml of ammonia water are added to every 10 g of residue. The mass fraction of ammonia water is 28%. The reaction is carried out at 200°C and 0.2 mPa for 100 min, and after the reaction, filtration is carried out to obtain a highly active extract of algae;

[0039] The highly active extract of algae, manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate and AC-Fe are mixed in a mass ratio of 2:0.1:0.05:0.05:0.05:0.01:0.1 to obtain trace element fertilizer;

[0040] (3) Preparation of highly active liquid fertilizer: Urea, potassium phosphate, water-soluble phosphate fertilizer and trace element fertilizer are mixed in a mass ratio of 28:10:10:2 to obtain highly active liquid fertilizer.

[0041] Example 2: Preparation of highly active liquid fertilizer

[0042] (1) Preparation of water-soluble phosphate fertilizer: Phenol, potassium tert-butoxide and sodium ethoxide are added to paper-making black liquor to obtain a mixed solution; the mass ratio of phenol to paper-making black liquor is 2:1, the concentration of potassium tert-butoxide in the mixed solution is 4 mmol / L, and the concentration of sodium ethoxide is 4 mmol / L; nitrogen is introduced and the reaction is carried out for 50 min under the condition of a 65°C water bath to obtain a highly active extract of paper-making black liquor;

[0043] The highly active extract of paper-making black liquor and ammonium dihydrogen phosphate are dissolved and blended in a mass ratio of 1:1 to obtain water-soluble phosphate fertilizer;

[0044] (2) Preparation of trace element fertilizer: Sargassum is dried and ground to obtain seaweed powder. 10 ml of citric acid with a mass percentage of 3% is added to each gram of seaweed powder, and it is shaken overnight at 50 °C and 200 rpm. After filtration and washing, ammonium sulfite and ammonia water are added to the residue. 2 g of ammonium sulfite and 0.1 ml of ammonia water are added to every 10 g of residue, and the mass fraction of ammonia water is 28%; The reaction is carried out at 200 °C and 0.2 mPa for 110 min, and after the reaction, filtration is carried out to obtain the highly active extract of algae;

[0045] The highly active extract of algae, manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate and AC-Fe are mixed according to a mass ratio of 5:0.5:0.1:0.1:0.1:0.05:0.2 to obtain the trace element fertilizer.

[0046] (3) Preparation of highly active liquid fertilizer: Urea, potassium phosphate, water-soluble phosphate fertilizer and trace element fertilizer are mixed according to a mass ratio of 24:10:13:1.5 to obtain the highly active liquid fertilizer.

[0047] Example 3: Preparation of highly active liquid fertilizer

[0048] (1) Preparation of water-soluble phosphate fertilizer: Phenol, potassium tert-butoxide and sodium ethoxide are added to paper-making black liquor (mass fraction of 70%) to obtain a mixed solution; The mass ratio of phenol to paper-making black liquor is 2:1, the concentration of potassium tert-butoxide in the mixed solution is 3 mmol / L, and the concentration of sodium ethoxide is 3 mmol / L; The reaction is carried out by passing nitrogen for 60 min under the condition of a 65 °C water bath to obtain the highly active extract of paper-making black liquor;

[0049] The highly active extract of paper-making black liquor and ammonium dihydrogen phosphate are dissolved and blended according to a mass ratio of 1:1 to obtain the water-soluble phosphate fertilizer;

[0050] (2) Preparation of trace element fertilizer: Kelp is dried and ground to obtain seaweed powder. 10 ml of citric acid with a mass fraction of 3% is added to each gram of seaweed powder, and it is shaken overnight at 30 °C and 200 rpm. After filtration and washing, ammonium sulfite and ammonia water are added to the residue. 2 g of ammonium sulfite and 0.1 ml of ammonia water are added to every 10 g of residue, and the mass fraction of ammonia water is 28%; The reaction is carried out at 200 °C and 0.2 mPa for 120 min, and after the reaction, filtration is carried out to obtain the highly active extract of algae;

[0051] The highly active extract of algae, manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate and AC-Fe are mixed according to a mass ratio of 3:0.3:0.05:0.05:0.05:0.01:0.1 to obtain the trace element fertilizer.

[0052] (3) Preparation of highly active liquid fertilizer: Urea, potassium phosphate, water-soluble phosphate fertilizer and trace element fertilizer are mixed according to a mass ratio of 24:10:15:1 to obtain the highly active liquid fertilizer.

[0053] Comparative Example 1:

[0054] (1) Preparation of trace element fertilizer: Dry and grind kelp to obtain seaweed powder. Add 10 ml of 3% citric acid by mass to each gram of seaweed powder. Shake overnight at 30 °C and 200 rpm. After filtration and washing, add ammonium sulfite and ammonia water to the residue. Add 2 g of ammonium sulfite and 0.1 ml of ammonia water to every 10 g of residue. The mass fraction of ammonia water is 28%. React at 200 °C and 0.2 mPa for 120 min. After the reaction, filter to obtain a highly active extract of algae;

[0055] Mix the highly active extract of algae, manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate, and AC-Fe in a mass ratio of 3:0.3:0.05:0.05:0.05:0.01:0.1 to obtain a trace element fertilizer.

[0056] (2) Mix urea, potassium phosphate, ammonium dihydrogen phosphate, and the trace element fertilizer in a mass ratio of 24:10:7.5:1 to obtain a fertilizer.

[0057] Comparative Example 2:

[0058] (1) Preparation of water-soluble phosphate fertilizer: Add phenol, potassium tert-butoxide, and sodium ethoxide to papermaking black liquor (mass fraction of 70%) to obtain a mixed solution. The mass ratio of phenol to papermaking black liquor is 2:1. The concentration of potassium tert-butoxide in the mixed solution is 3 mol / L, and the concentration of sodium ethoxide is 3 mol / L. React under a nitrogen atmosphere in a 65 °C water bath for 60 min to obtain a highly active extract of papermaking black liquor;

[0059] Dissolve and mix the highly active extract of papermaking black liquor and ammonium dihydrogen phosphate in a mass ratio of 1:1 to obtain a water-soluble phosphate fertilizer;

[0060] (2) Preparation of trace element fertilizer:

[0061] Mix manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate, and AC-Fe in a mass ratio of 0.3:0.05:0.05:0.05:0.01:0.1 to obtain a trace element fertilizer.

[0062] (3) Mix urea, potassium phosphate, the water-soluble phosphate fertilizer, and the trace element fertilizer in a mass ratio of 24:10:15:0.16 to obtain a fertilizer.

[0063] Comparative Example 3:

[0064] Mix manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate, and AC-Fe in a mass ratio of 0.3:0.05:0.05:0.05:0.01:0.1 to obtain a trace element fertilizer.

[0065] Mix urea, potassium phosphate, ammonium dihydrogen phosphate and trace element fertilizer in a mass ratio of 24:10:7.5:0.16 to obtain a fertilizer.

[0066] Test Example 1:

[0067] Store the highly active liquid fertilizers prepared in Examples 1 - 3 and the fertilizers prepared in Comparative Examples 1 - 3 at low temperature (4°C) for 180 days. The results are as Figure 1 shown. The liquid fertilizers prepared in Examples 1 - 3 are transparent and do not produce precipitation, while the liquid fertilizers prepared in Comparative Examples 1 - 3 produce precipitation.

[0068] Test Example 2: Application test in direct-seeded paddy fields:

[0069] 1. Test location: Kenli District, Dongying City, Shandong Province. Test time: 2022 - 2024. Rice variety: Shengdao 22

[0070] 2. Test design and method:

[0071] Set 4 treatments, with each treatment replicated 3 times. The plot area is 16 square meters, arranged in a randomized block design.

[0072] Dilute and apply the highly active liquid fertilizers prepared in Examples 1 - 3 and the fertilizers prepared in Comparative Examples 1 - 3 into the direct-seeded paddy fields. Apply 30 kg of liquid fertilizer per mu, and apply it in stages according to a ratio of 4:4:3 at the seedling stage, tillering stage, and filling stage. When applying, dilute it 300 times at the seedling stage, 200 times at the tillering stage, and 200 times at the filling stage. Keep the same for field weeding and pest control as the local enterprises. The plant spacing of the rice seedlings is 12 cm, and the row spacing is 30 cm.

[0073] At harvest, count all the rice panicles in a 1 m 2 area of the plot, then thresh and dry them for weighing, and convert it to the weight at a moisture content of 14.5% of paddy rice, and convert it to the yield per hectare.

[0074] Table 1 Effects of different fertilizers on the number of panicles per square meter and yield per hectare in direct-seeded paddy fields

[0075] Fertilizer type Number of panicles / piece Yield / Kg Example 1 210 10392.42 Example 2 204 10519.22 Example 3 220 10834.41 Comparative example 1 182 8565.89 Comparative example 2 193 8869.25 Comparative example 3 172 8024.95

[0076] As can be seen from Table 1, the panicle number and yield of the direct-seeded paddy fields treated with the highly active liquid fertilizers prepared in Examples 1-3 are significantly better than those of the direct-seeded paddy fields treated with the fertilizers prepared in the comparative examples. Among them, when comparing Example 3 with Comparative Example 3, highly active extracts of paper-making black liquor and highly active extracts of algae were added to the fertilizer. Compared with Comparative Example 3, the panicle number increased by 27.91% and the yield increased by 35.01%. When comparing Comparative Example 1 with Comparative Example 3, highly active extracts of algae were added to the fertilizer. Compared with Comparative Example 3, the panicle number increased by 5.81% and the yield increased by 6.74%. When comparing Comparative Example 2 with Comparative Example 3, highly active extracts of paper-making black liquor were added to the fertilizer. Compared with Comparative Example 3, the panicle number increased by 12.21% and the yield increased by 10.52%. It shows that the compounding of highly active extracts of black liquor and highly active extracts of algae has a synergistic effect on improving the panicle number and yield of rice.

[0077] Test Example 3: Potted carnation test:

[0078] 1. Test location: In the Science and Technology Innovation Park of Shandong Agricultural University, Tai'an City, Shandong Province;

[0079] 2. Test design and method:

[0080] The test was set with 4 treatments, and each treatment was repeated 3 times. Select seedlings with uniform growth and transplant them into plastic pots. Each repetition was 2 pots of carnations, with 3 plants in each pot. The carnation variety was "Pink Lady".

[0081] The highly active liquid fertilizers prepared in Examples 1-3 and the fertilizers prepared in Comparative Example 3 were diluted with water at a dilution ratio of 1:1000 for potting, and 20 mL was sprayed on each pot each time. All treatments did not apply fertilizer at the initial stage of seedling transplantation. The first fertilization treatment was carried out 7 days later, and then fertilization was carried out about every 3-4 days according to the weather conditions. After 8 fertilization treatments, the fertilization frequency was reduced to once every 7-8 days. The actual number of flowering flower buds / number of flower buds was used as the flowering rate.

[0082] The flowering rate, flowering time and average flowering period of carnations were counted. The test results were the average values of the number of flower buds and the number of flowering flower buds of 3 repetitions.

[0083] Table 2 Total number of flower buds and number of flowering flower buds of potted carnations

[0084] Fertilizer type Number of flower buds / piece Number of blooming flower buds / piece Blooming rate / % Example 1 30 26 86.67 Example 2 29 24 82.76 Example 3 30 23 76.67 Comparative example 3 20 13 65

[0085] As can be seen from Table 2, when the highly active liquid fertilizer prepared in Example 1 was used for potting, compared with the fertilizer prepared in Comparative Example 3, the flowering rate increased by 21.67%. When the highly active liquid fertilizer prepared in Example 2 was used for potted carnations, compared with the fertilizer prepared in Comparative Example 3, the flowering rate increased by 17.76%. When the highly active liquid fertilizer prepared in Example 3 was used for potting, the flowering rate increased by 11.67%

[0086] As Figure 2 shown, compared with the fertilizer prepared in Comparative Example 3, the flowering in Example 1 was advanced by 4 days and the flowering period was extended by 3 days. Compared with the fertilizer prepared in Comparative Example 3, the highly active liquid fertilizer prepared in Example 2 advanced the flowering by 4 days and extended the flowering period by 2 days. Compared with the fertilizer prepared in Comparative Example 3, the highly active liquid fertilizer prepared in Example 3 advanced the flowering by 6 days and extended the flowering period by 3 days.

[0087] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A highly active liquid fertilizer, characterized in that: It is composed of the following raw materials in parts by weight: 20-30 parts of urea, 8-12 parts of potassium sulfate, 10-15 parts of water-soluble phosphate fertilizer and 1-2 parts of trace element fertilizer; The water-soluble phosphate fertilizer is composed of a high-activity extract of papermaking black liquor and dihydrogen phosphate in a mass ratio of (1-3): (1-3); The trace element fertilizer is composed of high-activity algae extract and trace elements in a mass ratio of (2-5): (0.36-1.05).

2. The highly active liquid fertilizer according to claim 1, characterized in that The high-activity extract of papermaking black liquor is prepared by the following method: Phenolic substances and organic alkaline substances are added to papermaking black liquor to obtain a mixed solution; the mixture is reacted at 60-70° C. for 40-60 minutes under a nitrogen atmosphere to obtain a high-activity extract of the papermaking black liquor.

3. The highly active liquid fertilizer according to claim 2, characterized in that The mass ratio of papermaking black liquor to phenolic substances is (1-3):1, and the concentration of organic alkaline substances in the mixed solution is 6-10 mmol / L.

4. The highly active liquid fertilizer according to claim 2, characterized in that The phenolic substance is one or more of phenol and cresol.

5. The highly active liquid fertilizer according to claim 2, characterized in that The organic alkaline substance is one or more of sodium tert-butoxide, potassium tert-butoxide and sodium ethoxide.

6. The highly active liquid fertilizer according to claim 1, characterized in that The algae high-activity extract is prepared by the following method: After adding acid to the seaweed powder, the mixture is shaken and reacted at 20-50°C and 100-300 rpm for 8-14 hours, and the precipitate is washed and filtered after the reaction; ammonium sulfite and ammonia water are added to the precipitate, and the mixture is reacted at 150-250°C and 0.1-0.3 mPa for 100-120 minutes, and the high-activity algae extract is obtained by filtering after the reaction.

7. The highly active liquid fertilizer according to claim 6, characterized in that The acid is citric acid, hydrochloric acid or sulfuric acid; wherein the mass percentage of citric acid is 2%-4%, the concentration of hydrochloric acid is 0.1-0.3 mol / L, and the concentration of sulfuric acid is 0.05-0.15 mol / L.

8. The highly active liquid fertilizer according to claim 6, characterized in that The ratio of seaweed powder to acid added is 1 g: (8-12) mL; the ratio of precipitate, ammonium sulfite and ammonia water added is 10 g: (1-3) g: (0.05-0.15) mL, and the mass fraction of ammonia water is 25-35%.

9. The highly active liquid fertilizer according to claim 1, characterized in that The trace elements are composed of manganese sulfate, zinc sulfate, copper sulfate, ammonium molybdate, nickel sulfate and AC-Fe in a mass ratio of (0.1-0.5):(0.05-0.1):(0.05-0.1):(0.05-0.1):(0.01-0.05):(0.1-0.2).

10. Use of the highly active liquid fertilizer according to any one of claims 1 to 9 in at least one of the following (1) to (3): (1) Promote the increase of food crop production; (2) Promote early flowering of flower crops; (3) Prolong the flowering period of flower crops.

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