A slow-release fertilizer for planting perennial flowers in adverse and poor soil and a preparation method thereof

Abstract

The application discloses a kind of anti-reverse tolerance of poor root flower planting slow-release fertilizer and its preparation method, the slow-release fertilizer includes 30-45 parts of seaweed residue, humic acid 15-25 parts, diatomite 10-20 parts, oyster powder 5-15 parts, plant protein glue 3-8 parts, polyglutamic acid 1-3 parts, bacillus mucilaginosus powder 0.5-2 parts, brown algal oligosaccharide 0.1-0.5 parts, potassium silicate 2-5 parts, ammonium molybdate 0.05-0.15 parts, silicon phytic acid ester 0.5-2 parts, by introducing silicon phytic acid ester, fertilizer particles can be adjusted according to soil humidity release rate of nutrients, lock up nutrients in drought, accelerate release in wet; Absorption and fixation harmful metal ions in soil, reduce stress, and slowly hydrolyze in slow-release process, continuously provide beneficial substances, synergistically improve the fertilizer utilization rate of root flower in poor soil, resistance tolerance and sustained growth capacity.

Description

Technical Field

[0001] This invention belongs to the field of slow-release fertilizer preparation technology, specifically referring to a slow-release fertilizer for planting stress-resistant and barren perennial flowers and its preparation method. Background Technology

[0002] Slow-release fertilizers are commonly used in the cultivation of perennial flowers such as columbine, as they can improve nutrient utilization efficiency. Among slow-release fertilizers, sulfur-coated urea is relatively common due to its cost advantage, but its release curve is easily affected by environmental fluctuations. Chemically synthesized slow-release technology converts nitrogen into low-water-soluble compounds and utilizes microbial mineralization to achieve long-term supply. Bio-matrix slow-release fertilizers use natural polymer structures to achieve gradual nutrient release and improve the physical properties of the matrix. Compound slow-release fertilizers use multi-layer coating or hybrid carrier design to match nutrient release with crop needs.

[0003] Currently, the main problems with slow-release fertilizers in perennial flower cultivation lie in the mismatch between nutrient release rate and the dynamic growth needs of plants. This is especially true in alternating drought and wet conditions, which can easily lead to excessive nutrient loss or insufficient supply. Moreover, existing slow-release fertilizers have limited effectiveness in improving the stress resistance of flowers, and their ability to improve saline-alkali, infertile, and other stressful soils, as well as their ability to passivate heavy metal ions in situ, is generally insufficient. Furthermore, it is difficult to achieve a nutrient supply capacity that combines physical slow release, biostimulation, and chemical integration, thus achieving efficient nutrient utilization and synergistic improvement in plant stress resistance, which is the focus of current technological development. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a slow-release fertilizer for perennial flowers that is resistant to stress and poor soil conditions, along with its preparation method. By introducing phytic acid esters as functional film-forming and component, the fertilizer particles can dynamically adjust the nutrient release rate according to the soil's moisture conditions. Simultaneously, it weakens harmful metal ions in the soil to reduce rhizosphere stress and slowly hydrolyzes itself into beneficial substances such as phytic acid and silicic acid. This effectively solves the problems of current slow-release fertilizers for perennial flowers such as columbine having a single release mode and lacking the ability to actively enhance plant tolerance and provide continuous benefits in poor or adverse soils.

[0005] The technical solution adopted in this invention is as follows: This invention proposes a slow-release fertilizer for planting perennial flowers that is resistant to stress and poor soil and its preparation method, comprising the following raw materials in parts by weight: 30-45 parts of seaweed residue, 15-25 parts of humic acid, 10-20 parts of diatomaceous earth, 5-15 parts of oyster shell powder, 3-8 parts of plant protein glue, 1-3 parts of polyglutamic acid, 0.5-2 parts of Bacillus mucilaginosus powder, 0.1-0.5 parts of brown algae oligosaccharide, 2-5 parts of potassium silicate, 0.05-0.15 parts of ammonium molybdate, and 0.5-2 parts of phytic acid ester.

[0006] Furthermore, the method for preparing the silica phytate includes the following steps: S1: Under inert gas protection, phytic acid and silane coupling agent are added to an organic solvent in proportion, and esterification reaction is carried out under constant temperature conditions. The mixture is continuously stirred and refluxed to obtain the crude product. S2: The crude product obtained in step S1 is purified by extraction to separate the organic phase, and then the organic solvent is removed by vacuum distillation to obtain a concentrated silicate phytate solution. S3: Spray dry the concentrated silica phytate solution obtained in step S2 to obtain a light yellow to yellowish-brown powdered silica phytate product.

[0007] Further, in step S1, the molar ratio of phytic acid to silane coupling agent is 1:(1.0-1.5).

[0008] Furthermore, in step S1, the esterification reaction is carried out at a temperature of 70-90°C for 4-8 hours.

[0009] Further, in step S1, the organic solvent is one of toluene, xylene, and tetrahydrofuran, and the volume-to-mass ratio of the organic solvent to the total mass of phytic acid and silane coupling agent is 5-15 mL / g.

[0010] Furthermore, in step S2, the extractant used for extraction is ethyl acetate, and the volume ratio of ethyl acetate to the crude product is (3-5):1.

[0011] Furthermore, in step S3, the inlet temperature of the spray dryer is 120-150°C.

[0012] Furthermore, it includes the following steps: (1) The seaweed residue, humic acid, diatomaceous earth and oyster powder are crushed separately and then mixed evenly to obtain base material A; (2) After premixing Bacillus mucilaginosus powder, alginate oligosaccharide, potassium silicate, ammonium molybdate and part of base material A, mix them evenly with the remaining base material A to obtain the total mixture; (3) Dissolve plant protein glue and polyglutamic acid in water to make an adhesive liquid. Spray the adhesive liquid onto the total mixture in a granulator to granulate and obtain wet granules. Then dry and coat the wet granules to obtain slow-release fertilizer granules.

[0013] Further, in step (3), the mass concentration of plant protein glue in the adhesive liquid is 5%-10%, and the mass concentration of polyglutamic acid is 1%-3%.

[0014] Furthermore, in step (3), the coating process is carried out in a fluidized bed coating machine at a coating temperature of 60-75°C.

[0015] The beneficial effects achieved by the present invention using the above solution are as follows: (1) This scheme proposes a slow-release fertilizer for planting perennial flowers that is resistant to stress and poor soil and its preparation method. The phytic acid ester can form a film on the surface of the fertilizer particles. The structure of the film can change according to the humidity of the rhizosphere soil. The release rate of fertilizer nutrients is regulated by the soil humidity. Under drought conditions, the film structure tends to be dense, effectively locking the nutrients inside the fertilizer particles and preventing ineffective loss. When the root system is active and the soil humidity increases, the film structure can be controlled to relax, accelerating the release of nutrients. This allows the nutrients to be more in line with the fertilizer requirements of perennial flowers such as columbine, so as to achieve on-demand supply to perennial flowers and improve fertilizer utilization.

[0016] (2) The active groups in phytic acid esters have a strong adsorption and fixation capacity for common harmful metal ions such as aluminum and lead in the soil, which effectively reduces the concentration of harmful metal ions in the rhizosphere of flowers and reduces the toxic effects on the roots of flowers. At the same time, the silicon element in phytic acid ester molecules is deposited more stably in the plant, promotes cell wall silicification, enhances the strength of cells to resist harmful metal ions, and jointly improves the survival and growth capacity of perennial flowers, especially columbine, in saline-alkali, barren or mildly polluted soils.

[0017] (3) During the slow release process of fertilizer, the ester bond of phytic acid ester can be slowly hydrolyzed. The phytic acid and soluble silica in the hydrolysis products are both beneficial substances that can be absorbed and utilized by plants. Phosphorus can be stored in phytic acid, and silica can participate in a variety of stress-resistant metabolic pathways, so that fertilizer can provide plants with more sustainable nutrition or stress-resistant inducing substances, and provide more lasting nutritional support for the growth of perennial flowers such as columbine. Attached Figure Description

[0018] Figure 1 The images shown are SEM electron microscope results of a slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers proposed in this invention. Figure A is a cross-sectional structure diagram of the slow-release fertilizer, and Figure B is a surface structure diagram of the slow-release fertilizer.

[0019] Figure 2 This is a comparison chart of the performance of different groups of slow-release fertilizers for planting stress-resistant and barren perennial flowers under different humidity conditions, as proposed in this invention.

[0020] Figure 3 This invention presents a slow-release fertilizer for planting stress-resistant and barren perennial flowers, which is a comparison of the relationship between nutrient loss and absorption under different humidity conditions and the heavy metal content in different parts of the plant.

[0021] Figure 4 This is a comparison chart of heavy metal content in different parts of perennial flowers using a slow-release fertilizer for planting perennial flowers that is resistant to stress and poor soil conditions, as proposed in this invention.

[0022] Figure 5 The figure shows the results of a test verifying the passivation of heavy metals and the stress resistance and growth promotion ability of a slow-release fertilizer for planting perennial flowers that is resistant to stress and poor soil, as proposed in this invention.

[0023] Figure 6 This is a dynamic change diagram of available phosphorus content in soil samples of a slow-release fertilizer for planting stress-resistant and barren perennial flowers proposed in this invention.

[0024] Figure 7 This is a dynamic change diagram of available silicon content in soil samples of a slow-release fertilizer for planting stress-resistant and barren perennial flowers proposed in this invention.

[0025] Figure 8 This is a dynamic change diagram of plant height for different samples of a slow-release fertilizer for planting stress-resistant and barren perennial flowers proposed in this invention.

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that, unless otherwise specified, all chemical reagents involved in this invention were purchased through commercial channels.

[0029] The seaweed residue (10 mesh) used in this invention was purchased from Qingdao Huifulin Marine Biotechnology Co., Ltd.; humic acid (≥90%) was purchased from Shanghai Maclean Biochemical Technology Co., Ltd.; diatomaceous earth (99%) was purchased from Shandong Xinhe New Materials Co., Ltd.; oyster powder (10:1) was purchased from Nanjing Zelang Biotechnology Co., Ltd.; plant protein gum was purchased from the Natural Plant Gum Development Center of Beijing General Research Institute of Mining and Metallurgy; polyglutamic acid (degree of polymerization 7000) was purchased from Shaanxi Rongbai Biotechnology Co., Ltd.; Bacillus mucilaginosus powder (effective viable bacteria count ≥10 billion CFU / g) was purchased from Henan Wokas Biotechnology Co., Ltd.; brown algae oligosaccharides (≥85%) were purchased from Qingdao Hehai Biotechnology Co., Ltd.; potassium silicate (modulus 2.4-2.6) was purchased from Hubei Yuanmeng Biotechnology Co., Ltd.; and ammonium molybdate (99.98%) was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0030] Example 1:

[0031] A slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers and its preparation method Phytic acid and a silane coupling agent were added to toluene at a molar ratio of 1:1.0, and an esterification reaction was carried out at a constant temperature of 70°C. The mixture was continuously stirred and refluxed for 4 hours to obtain a crude product. The crude product was purified by extraction with ethyl acetate at a volume ratio of 3:1 to the crude product to separate the organic phase. Toluene was then removed by vacuum distillation to obtain a concentrated silicate phytate solution. The concentrated silicate phytate solution was spray-dried at an inlet temperature of 120°C to obtain a light yellow to yellowish-brown powdered silicate phytate product.

[0032] 30 parts of seaweed residue, 15 parts of humic acid, 10 parts of diatomaceous earth, and 5 parts of oyster powder were pulverized separately and then mixed evenly to obtain base material A. 0.5 parts of Bacillus mucilaginosus powder, 0.1 parts of fucoidan, 2 parts of potassium silicate, and 0.05 parts of ammonium molybdate were premixed with a portion of base material A, and then mixed evenly with the remaining base material A to obtain a total mixture. 3 parts of plant protein glue and 1 part of polyglutamic acid were dissolved in water to prepare an adhesive liquid, wherein the mass concentration of plant protein glue was 5% and the mass concentration of polyglutamic acid was 1%. The adhesive liquid was sprayed onto the total mixture in a granulator for granulation to obtain wet granules. The wet granules were then dried and coated at 60°C in a fluidized bed coating machine to obtain slow-release fertilizer granules.

[0033] Example 2:

[0034] A slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers and its preparation method Phytic acid and a silane coupling agent were added to xylene at a molar ratio of 1:1.25, and an esterification reaction was carried out at a constant temperature of 80°C. The mixture was continuously stirred and refluxed for 6 hours to obtain a crude product. The crude product was purified by extraction with ethyl acetate at a volume ratio of 4:1 to the crude product to separate the organic phase. Xylene was then removed by vacuum distillation to obtain a concentrated phytic acid ester solution. The concentrated phytic acid ester solution was spray-dried at an inlet temperature of 135°C to obtain a light yellow to yellowish-brown powdered phytic acid ester product.

[0035] 37.5 parts of seaweed residue, 20 parts of humic acid, 15 parts of diatomaceous earth, and 10 parts of oyster shell powder were pulverized separately and then mixed evenly to obtain base material A. 1.25 parts of Bacillus mucilaginosus powder, 0.3 parts of fucoidan, 3.5 parts of potassium silicate, and 0.1 parts of ammonium molybdate were premixed with a portion of base material A, and then mixed evenly with the remaining base material A to obtain the total mixture. 5.5 parts of plant protein glue and 2 parts of polyglutamic acid were dissolved in water to prepare an adhesive liquid, wherein the mass concentration of plant protein glue was 7.5% and the mass concentration of polyglutamic acid was 2%. The adhesive liquid was sprayed onto the total mixture in a granulator for granulation to obtain wet granules. The wet granules were then dried and coated in a fluidized bed coating machine at 67.5℃ to obtain slow-release fertilizer granules.

[0036] Example 3:

[0037] A slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers and its preparation method Phytic acid and a silane coupling agent were added to tetrahydrofuran at a molar ratio of 1:1.5, and an esterification reaction was carried out at a constant temperature of 90°C. The mixture was continuously stirred and refluxed for 8 hours to obtain a crude product. The crude product was purified by extraction with ethyl acetate at a volume ratio of 5:1 to the crude product to separate the organic phase. The tetrahydrofuran was then removed by vacuum distillation to obtain a concentrated silicate phytate solution. The concentrated silicate phytate solution was spray-dried at an inlet temperature of 150°C to obtain a light yellow to yellowish-brown powdered silicate phytate product.

[0038] 45 parts of seaweed residue, 25 parts of humic acid, 20 parts of diatomaceous earth, and 15 parts of oyster shell powder were pulverized separately and then mixed evenly to obtain base material A. 2 parts of Bacillus mucilaginosus powder, 0.5 parts of fucoidan, 5 parts of potassium silicate, and 0.15 parts of ammonium molybdate were premixed with part of base material A, and then mixed evenly with the remaining base material A to obtain the total mixture. 8 parts of plant protein glue and 3 parts of polyglutamic acid were dissolved in water to prepare an adhesive liquid, wherein the mass concentration of plant protein glue was 10% and the mass concentration of polyglutamic acid was 3%. The adhesive liquid was sprayed onto the total mixture in a granulator for granulation to obtain wet granules. The wet granules were then dried and coated at 75°C in a fluidized bed coating machine to obtain slow-release fertilizer granules.

[0039] Comparative Example 1: The specific implementation method is the same as in Example 1, except that no silicate phytate is added when preparing the slow-release fertilizer.

[0040] Comparative Example 2: The specific implementation method is the same as in Example 1, except that: when preparing the slow-release fertilizer, the synthesis step of phytate is not carried out, and phytate is replaced with an equal mass of polyacrylamide.

[0041] Comparative Example 3: The specific implementation method is the same as in Example 1, except that: when preparing the slow-release fertilizer, the synthesis step of phytate is not carried out, and phytate is replaced with an equal mass of hydroxypropyl methylcellulose.

[0042] Experimental Example 1: Fertilizers tested: Examples 1, 2, and 3 were used as the experimental groups, and Comparative Examples 1, 2, and 3 were used as the control groups.

[0043] Test plants: Seedlings of the same species of Columbine, which were vigorous and grew uniformly.

[0044] Cultivation substrate: Use cleaned and sieved poor sandy loam soil to ensure low and uniform background nutrient content.

[0045] Potting setup: Fill the flower pots with sandy loam soil evenly, apply different fertilizers with equal amounts of nitrogen, phosphorus and potassium to each flower pot, mix the fertilizer with the soil, set up at least 10 replicates for each treatment group (6 kinds of fertilizers), transplant the flower seedlings, and allow them to recover for one week.

[0046] Humidity control: Randomly divide all flower pots into two groups: Group A (Drought Stress Group): Soil moisture content was controlled at 30%-40% of field capacity to simulate drought conditions.

[0047] Group B (Suitable Humidity Group): Soil moisture content was controlled at 60%-70% of field capacity to simulate suitable conditions for active root systems.

[0048] Observation and sampling: In weeks 1, 2, 4 and 8 after the start of the experiment, groups A and B were leached with a quantitative amount of deionized water to simulate moderate rainfall (e.g., 20 mm), and all leaching liquid was collected.

[0049] The concentrations of nitrogen (ammonium nitrogen, nitrate nitrogen), phosphorus, and potassium ions in each collected leachate were measured, and the cumulative nutrient loss was calculated.

[0050] After 60 days of the experiment, the plants were harvested, and the fresh weight and dry weight of the aboveground parts and roots were measured, and the total biomass was calculated.

[0051] The plant samples were crushed and digested, and their total nitrogen, total phosphorus, and total potassium contents were determined to calculate the total amount of nutrients absorbed by the plant.

[0052] The test results are as follows Figure 1 , Figure 2 , Figure 3As shown, under both drought and suitable humidity conditions, the example group containing phytate silicate exhibited significant performance advantages. Electron microscopy results showed that the cross-section of the film layer formed by phytate silicate on the fertilizer surface in Figure A appeared dense and uniform, while the film surface in Figure B was relatively smooth. Under drought stress, the example group effectively controlled nutrient loss while maintaining high plant biomass and nutrient uptake. Its fertilizer utilization rate was much higher than that of the control group without phytate silicate. Under suitable humidity conditions, the example group maintained a relatively low nutrient leaching level while ensuring nutrient supply efficiency, and achieved higher plant growth and total nutrient uptake. In summary, this fertilizer can intelligently regulate the nutrient release rhythm according to changes in soil moisture, locking in nutrients to reduce loss during drought and accelerating release for plant use during humid conditions. Thus, it can effectively improve fertilizer utilization efficiency under different water conditions, demonstrating good environmental responsiveness and adaptability.

[0053] Experimental Example 2: Fertilizers tested: Examples 1, 2, and 3 were used as the experimental groups, and Comparative Examples 1, 2, and 3 were used as the control groups.

[0054] Test plants: Selected seedlings of Columbine that are sensitive to heavy metals.

[0055] Stressed soil: Prepare soil with mild heavy metal contamination (add appropriate amounts of aluminum chloride and lead acetate to bring the content of available aluminum and lead to a mild contamination level).

[0056] Stress cultivation: Stressed soil was potted, and equal amounts of fertilizer from the experimental group and control group 1 were applied. Seedlings were transplanted, with at least 8 replicates for each treatment, and cultured under the same suitable temperature, light and water conditions.

[0057] Soil and rhizosphere environment monitoring: Rhizosphere soil samples were collected on the 30th and 60th day after planting; soil pH and cation exchange capacity were measured.

[0058] The content of available aluminum and lead in soil was determined by DTPA extraction method, and the effect of fertilizer on the fixation of heavy metal bioavailability was analyzed.

[0059] Plant physiology and toxic response determination: Observe and record whether leaves show symptoms of toxicity such as yellowing, brown spots, and curling, and measure biomass after the experiment.

[0060] The chlorophyll content, malondialdehyde content (degree of membrane lipid peroxidation), and superoxide dismutase and peroxidase activity (antioxidant system) in the leaves were measured.

[0061] The aluminum and lead content in plant roots and aboveground parts was determined, and the translocation coefficient was calculated.

[0062] New root tips and leaves were taken, and the deposition of silicon in the cell wall was observed under a microscope using the molybdenum blue staining method.

[0063] Table 1. Results of the verification experiment on the passivation of heavy metals and the stress resistance and growth promotion ability of slow-release fertilizer for stress resistance and poor soil conditions.

[0064] The test results are shown in Table 1. Figure 4 , Figure 5 As shown, compared with the control group without added phytate or other coating materials, the control group treated with this slow-release fertilizer showed significant comprehensive advantages. It can effectively reduce the bioavailability of harmful metals in the rhizosphere soil and alleviate the toxic symptoms caused by heavy metal stress to perennial flowers. Specifically, it is manifested in a significant increase in plant biomass, higher chlorophyll content in leaves and lower degree of membrane lipid peroxidation, while the activity of the plant's antioxidant enzyme system is enhanced. Further results show that the treatment in this example promotes the fixation of heavy metals in the roots and significantly inhibits their translocation to the aboveground parts. In addition, microscopic observation shows that the treatment in this example significantly promotes the deposition of silicon in the plant cell walls. The final results show that the fertilizer in this example has significant effects in passivating heavy metals in the soil, enhancing the plant's own stress resistance, and promoting growth.

[0065] Experimental Example 3: Fertilizers tested: Examples 1, 2, and 3 were used as the experimental groups, and Comparative Examples 1, 2, and 3 were used as the control groups.

[0066] Test plants: Columbine was selected, which has a high silicon requirement and obvious differences in stress resistance.

[0067] Cultivation substrate: Low-phosphorus, low-silica sandy soil or desilicified soil to highlight subsequent differences.

[0068] In a long-term pot experiment, the experimental group and the control group were given the same amount (and equal amounts of nitrogen, phosphorus and potassium) of fertilizer in low phosphorus and silicon soil. The seedlings were transplanted and managed in a conventional manner. The experimental period was set to be relatively long, such as 120 days or a complete growing season.

[0069] Dynamic monitoring of available soil nutrients: Soil samples were collected from the root zone on days 0, 30, 60, 90, and 120 after fertilization.

[0070] The content of available phosphorus and available silicon in the soil was measured. It was expected that the differences would not be significant in the early stage, but as time went on, these two indicators in the experimental group soil should be able to maintain a relatively high level, while the control group 1 would continue to decline.

[0071] Plant growth and physiological monitoring in the middle and late stages: During the middle and late stages of the experiment (such as after day 60), plant height, stem diameter, and leaf area were measured regularly, and biomass was measured at the end of the experiment.

[0072] In the later stages of the experiment (such as on days 90 and 120), functional leaves were collected to determine the total phosphorus and total silicon content, as well as the content of related metabolites such as phytic acid and soluble silicon compounds.

[0073] In the later stages of the experiment, plants can be subjected to mild drought or low temperature stress treatment, and then their proline content and the expression level of related stress-resistant genes can be rapidly measured (e.g., by qPCR) to compare the stress resistance response capabilities of the experimental group and the control group.

[0074] The test results are as follows Figure 6 , Figure 7 , Figure 8 As shown, after a 120-day cultivation period, the columbine plants treated with the slow-release fertilizer containing phytate showed significantly better growth and physiological indicators than the control group without phytate or with other materials. This was because the available phosphorus and available silicon in the soil of the experimental group remained at relatively high levels throughout the experimental period, and the plants showed significant advantages in plant height, stem diameter, and biomass accumulation in the later stages. The content of total phosphorus, total silicon, and phytic acid in the leaves was also higher. Under mild stress applied in the later stages of the experiment, the plants in the experimental group showed stronger proline accumulation capacity and stress resistance gene expression levels. The results indicate that the fertilizer in this scheme not only achieves slow nutrient release, but its core component, phytate, can also provide stable phosphorus, silicon, and other nutrients for the long-term growth of perennial flowers through continuous hydrolysis, and effectively enhance the stress resistance potential of the plants in the later stages, achieving the dual effect of long-term nutritional support and stress resistance enhancement.

[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0076] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0077] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers, characterized in that: The raw materials include the following parts by weight: 30-45 parts seaweed residue, 15-25 parts humic acid, 10-20 parts diatomaceous earth, 5-15 parts oyster powder, 3-8 parts plant protein gum, 1-3 parts polyglutamic acid, 0.5-2 parts Bacillus mucilaginosus powder, 0.1-0.5 parts brown algae oligosaccharide, 2-5 parts potassium silicate, 0.05-0.15 parts ammonium molybdate, and 0.5-2 parts phytic acid ester.

2. The slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 1, characterized in that, The preparation method of the silica phytate includes the following steps: S1: Under inert gas protection, phytic acid and silane coupling agent are added to an organic solvent in proportion, and esterification reaction is carried out under constant temperature conditions. The mixture is continuously stirred and refluxed to obtain the crude product. S2: The crude product obtained in step S1 is purified by extraction to separate the organic phase, and then the organic solvent is removed by vacuum distillation to obtain a concentrated silicate phytate solution. S3: Spray dry the concentrated silica phytate solution obtained in step S2 to obtain a light yellow to yellowish-brown powdered silica phytate product.

3. The slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 2, characterized in that: In step S1, the molar ratio of phytic acid to silane coupling agent is 1:(1.0-1.5).

4. The slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 3, characterized in that: In step S1, the esterification reaction is carried out at a temperature of 70-90°C for 4-8 hours.

5. The slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 4, characterized in that: In step S1, the organic solvent is one of toluene, xylene, and tetrahydrofuran, and the volume-to-mass ratio of the organic solvent to the total mass of phytic acid and silane coupling agent is 5-15 mL / g.

6. The slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 5, characterized in that: In step S2, the extractant used is ethyl acetate, and the volume ratio of ethyl acetate to the crude product is (3-5):

1.

7. The slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 6, characterized in that: In step S3, the inlet temperature of the spray dryer is 120-150℃.

8. A method for preparing a slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to any one of claims 1-7, characterized in that, Includes the following steps: (1) The seaweed residue, humic acid, diatomaceous earth and oyster powder are crushed separately and then mixed evenly to obtain base material A; (2) After premixing Bacillus mucilaginosus powder, alginate oligosaccharide, potassium silicate, ammonium molybdate and part of base material A, mix them evenly with the remaining base material A to obtain the total mixture; (3) Dissolve plant protein glue and polyglutamic acid in water to make an adhesive liquid, and spray the adhesive liquid onto the total mixture in a granulator to granulate and obtain wet granules; The wet granules are then dried and coated to obtain slow-release fertilizer granules.

9. The method for preparing a slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 8, characterized in that: In step (3), the mass concentration of plant protein glue in the adhesive liquid is 5%-10%, and the mass concentration of polyglutamic acid is 1%-3%.

10. The method for preparing a slow-release fertilizer for planting stress-resistant and barren-tolerant perennial flowers according to claim 9, characterized in that: In step (3), the coating process is carried out in a fluidized bed coating machine at a coating temperature of 60-75°C.

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