Plant nutrient absorption synergist and preparation method thereof

Abstract

The invention relates to the technical field of agriculture, in particular to a plant nutrient absorption synergist and a preparation method thereof. The feed additive is prepared from the following raw materials: seaweed essence-water lettuce powder, glycerol monostearate, beta-glucan, sodium citrate and peanut straw-illite. Active groups of the seaweed essence-water lettuce powder and the peanut straw-illite form a hydrogen bond network, a mesoporous structure is constructed, and the stability of the composite material is enhanced. A nitrogen-containing compound in the seaweed essence-water lettuce powder enters an interlayer space to form an organic-inorganic hybrid intercalation structure, and a three-dimensional network is constructed through electrostatic attraction and Van der Waals force. Charges on the surface of the material are complementary, the ion exchange efficiency is improved, and the rhizosphere microenvironment is cooperatively adjusted. Beta-glucan reduces ion competition through chelation and improves nutrient absorption efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of agriculture, and in particular to a plant nutrient absorption enhancer and a preparation method thereof. Background Art

[0002] In modern agricultural production, crop nutrient supply mainly relies on the traditional method of applying chemical fertilizers, but this practice has many problems.

[0003] First, farmers often over-apply chemical fertilizers to ensure production, which causes serious damage to the soil environment, including soil compaction, acidification, salinization, and other problems, affecting the sustainable use of the soil. Second, excessive use of chemical fertilizers will cause nutrient loss, leading to environmental problems such as eutrophication of water bodies and groundwater pollution, threatening the balance of the ecosystem.

[0004] More importantly, the absorption and utilization rate of nutrients in chemical fertilizers by plants is generally low. The utilization rate of nitrogen fertilizer is generally around 30-35%, while that of phosphorus fertilizer is only 10-25%, and that of potassium fertilizer is about 35-50%. A large amount of nutrients are lost through leaching, volatilization, and fixation, which not only causes waste of resources, but also increases farmers' planting costs.

[0005] In addition, traditional fertilization methods are difficult to meet the differentiated nutrient demands of crops in different growth stages, often resulting in excess nutrients in the early stages and insufficient supply in the later stages, which affects the improvement of crop yield and quality.

[0006] Faced with these problems, scientific researchers began to look for new solutions. In recent years, with the increasing awareness of agricultural environmental protection and the pursuit of efficient ecological agricultural development models, the research and development and application of plant nutrient absorption enhancers have gradually become an important direction of agricultural scientific and technological innovation. Summary of the invention

[0007] (1) Technical issues to be solved

[0008] The purpose of the present invention is to provide a plant nutrient absorption enhancer and a preparation method thereof, so as to solve the key problems of low nutrient utilization rate of fertilizers and serious damage to the soil ecological environment caused by excessive fertilization in current agricultural production.

[0009] (2) Technical solution

[0010] To achieve the above objectives, on the one hand, the present invention provides a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 20 to 25 parts of seaweed essence-water lettuce powder, 2 to 3 parts of glycerol monostearate, 1 to 2 parts of β-glucan, 3 to 4 parts of sodium citrate, and 30 to 35 parts of peanut straw-illite.

[0011] Furthermore, the method for preparing peanut straw-illite comprises:

[0012] S11. Chop the peanut straw into 3-5 cm to obtain chopped peanut straw, dry the chopped peanut straw at 65-70° C. for 24-36 h to obtain dried peanut straw, crush the dried peanut straw through a 100-mesh sieve to obtain crushed peanut straw, soak the crushed peanut straw in a 4% NaOH solution, stir at 90-100° C. for 4-5 h to obtain soaked peanut straw, filter the soaked peanut straw and wash with water until the pH is 7.0-7.5 to obtain washed peanut straw, dry the washed peanut straw at 60-70° C. for 12-24 h to obtain pretreated peanut straw;

[0013] S12. crushing the illite through a 200-mesh sieve to obtain sieved illite, activating the sieved illite with 1 mol / L sulfuric acid, stirring at room temperature for 4 to 5 hours to obtain activated illite, filtering the activated illite and washing with water until the pH value is 7.0 to 7.5 to obtain washed illite, and drying the washed illite at 105 to 110° C. for 6 to 7 hours to obtain pretreated illite;

[0014] S13. Adding the pretreated peanut straw to a 3% polyethyleneimine solution and stirring at 60 to 70° C. for 2 to 3 h to obtain modified peanut straw, filtering the modified peanut straw to obtain filtered peanut straw, and drying the filtered peanut straw at 50 to 60° C. for 3 to 4 h to obtain dried peanut straw;

[0015] S14. Mixing the dried peanut straw with the pretreated illite to obtain a mixture, adding the mixture to deionized water, and adding 1% carboxymethyl cellulose to obtain a mixed solution, stirring the mixed solution at 75 to 80° C. for 3 to 4 hours to obtain a stirred mixed solution, and adjusting the pH of the stirred mixed solution to 6.5 to 7.0 to obtain a pH-adjusted mixed solution;

[0016] S15. Ultrasonicate the pH-adjusted mixed solution for 45 to 50 minutes to obtain an ultrasonically treated mixed solution, centrifuge the ultrasonically treated mixed solution at 5000 to 6000 r / min for 20 to 30 minutes to obtain a centrifuged mixture, dry the centrifuged mixture at 80 to 90° C. for 12 to 24 hours to obtain a dried mixture, and crush the dried mixture through an 80-mesh sieve to obtain peanut straw-illite.

[0017] Furthermore, the preparation method of the seaweed essence-water lettuce powder comprises:

[0018] S21. The water hyacinth was washed and drained to obtain the washed water hyacinth, the washed water hyacinth was dried at 60 to 70 ° C for 24 to 36 h to obtain dried water hyacinth, the dried water hyacinth was crushed through a 200 to 300 mesh sieve to obtain water hyacinth powder;

[0019] S22. Washing and cutting the seaweed to obtain the cut seaweed, adding 0.1-0.15 mol / L hydrochloric acid to the cut seaweed and extracting at 70-80° C. for 2-3 h to obtain the extracted seaweed, filtering and concentrating the extracted seaweed to obtain seaweed essence;

[0020] S23. Take water hyacinth powder and add 3-5% NaOH solution, and stir and treat at 50-60 ℃ for 2-3h to obtain treated water hyacinth powder, filter the treated water hyacinth powder and rinse with water 3-4 times to obtain rinsed water hyacinth powder, and dry the rinsed water hyacinth powder at 50-60 ℃ for 4-5h to obtain activated water hyacinth powder;

[0021] S24. The activated water lettuce powder and seaweed extract are mixed and added to deionized water, and 0.5-1.0% carboxymethyl cellulose is added to obtain a first mixed solution, the first mixed solution is stirred at 70-80° C. for 2-4 hours to obtain a second mixed solution, and the pH of the second mixed solution is adjusted to 6.5-7.0 to obtain a third mixed solution;

[0022] S25. Ultrasonicate the third mixed solution for 30 to 40 minutes to obtain a mixed solution after ultrasound, centrifuge the mixed solution after ultrasound at 4000 to 5000 r / min for 15 to 20 minutes to obtain a centrifuged mixed solution, spray-dry the centrifuged mixed solution at 60 to 70°C to obtain a dried product, granulate the dried product and pass it through an 80 to 90 mesh sieve to obtain seaweed essence-water lettuce powder.

[0023] On the other hand, based on the same inventive concept, the present invention also provides a method for preparing a plant nutrient absorption enhancer, which is applied to the plant nutrient absorption enhancer, comprising the following steps:

[0024] S31. The glyceryl monostearate is heated to 80 to 85° C. to obtain melted glyceryl monostearate, the melted glyceryl monostearate is added to deionized water, and the temperature is controlled at 80 to 85° C. to obtain an aqueous solution of glyceryl monostearate, and the aqueous solution of glyceryl monostearate is sheared and stirred at 3000 to 4000 r / min for 10 to 20 min to obtain an emulsion;

[0025] S32. Weigh sodium citrate and dissolve it in deionized water to obtain a sodium citrate solution, add β-glucan to the sodium citrate solution, and stir at a temperature of 60 to 70 ° C and a speed of 300 to 400 r / min for 30 to 40 min to obtain a solution A;

[0026] S33. Add seaweed extract-water lettuce powder to solution A, and stir at 400-500 r / min for 20-30 min to obtain solution B, add the emulsion to solution B, continue stirring for 15-20 min to obtain solution C, add peanut straw-illite to solution C, and adjust the pH to 6.8-7.2 to obtain solution D;

[0027] S34. The solution D was shear-stirred at 4000-5000 r / min for 10-20 min to obtain a solution E, and the solution E was ultrasonically treated for 30-40 min to obtain a solution F;

[0028] S35. The solution F is spray-dried at 80-90° C. to obtain a product, and the product is granulated and passed through a 100-mesh sieve to obtain a plant nutrient absorption enhancer.

[0029] The mechanism of action of the above raw material components is as follows:

[0030] Seaweed extract - Water lettuce powder: Through its rich trace elements and bioactive substances, it can significantly improve the efficiency of plant nutrient absorption, promote root development, enhance crop resistance, and improve soil physical and chemical properties, thereby optimizing the plant growth environment.

[0031] Glyceryl monostearate: As a surfactant, its main function is to reduce the surface tension of liquids, enhance the dispersion and permeability of nutrients, help nutrients adhere evenly to the surface of plant leaves and roots, and improve the utilization and absorption efficiency of nutrients.

[0032] β-Glucan: It has a biostimulatory effect, can activate the plant's defense mechanism, promote root growth, and enhance the plant's resistance to adversity.

[0033] Sodium citrate: As a chelating agent, it can form chelates with metal ions such as calcium, magnesium, and iron in the soil, reduce nutrient fixation, increase nutrient effectiveness, and at the same time regulate soil pH to improve nutrient release and absorption conditions.

[0034] Peanut straw-illite: Through its physical structure and mineral composition, it can slowly release nutrients, adjust the soil nutrient balance, and improve the utilization efficiency of nutrients. At the same time, it improves the soil pore structure, enhances soil water retention and aeration, and creates a better ecological environment for crop growth.

[0035] (3) Beneficial effects

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. By constructing an organic-inorganic hybrid interlayer structure, the specific surface area of ​​the material is significantly increased, and a micropore system is established, providing a more efficient temporary storage, transmission and release space for nutrients.

[0038] 2. The introduction of β-glucan as a key regulator can effectively reduce the mutual repulsion between mineral ions through chelation, so that various nutrient ions can be absorbed by plants in a more balanced and efficient manner, significantly improving nutrient utilization efficiency and overcoming the problem of nutrient waste caused by ion competition in traditional composite materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a physical picture of seaweed essence-water lettuce powder in Example 1 of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The test equipment and preparations of the examples described below are as follows:

[0042] Electronic balance (Sartorius, Germany), electric blast constant temperature dryer (Shanghai Fomar Experimental Equipment), electric constant temperature water bath (Jiangsu Kedao), pulverizer (Shandong Tianfang Machinery), magnetic stirrer (Shanghai Meiyingpu), pH meter (Fujian Shunchang), ultrasonic cleaner (Shenzhen Fuyang), centrifuge (Hunan Keda), spray dryer (Shanghai Bilang); chemicals and reagents were purchased from Sigma-Aldrich.

[0043] Example 1: This example discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22 parts of seaweed essence-water lettuce powder, 2.2 parts of glycerol monostearate, 1.8 parts of β-glucan, 3.2 parts of sodium citrate, and 32 parts of peanut straw-illite.

[0044] The active groups such as carboxyl, hydroxyl and sulfate groups in the seaweed extract-water lettuce powder composite can form a hydrogen bond network with the silanol groups on the surface of the peanut straw-illite composite. This hydrogen bond network not only enhances the stability of the composite material, but also provides a temporary storage space for nutrients through the constructed mesoporous structure.

[0045] On this basis, nitrogen-containing compounds (such as proteins, peptides and amino acids) in seaweed essence-water lettuce powder can enter the interlayer space of peanut straw-illite to form an organic-inorganic hybrid intercalation structure. This structure increases the interlayer spacing of the material, providing more nutrient adsorption sites and storage space. Through the electrostatic attraction and van der Waals forces between molecules, the material is further stacked and cross-linked, gradually building a hierarchical three-dimensional network. This structure not only increases the specific surface area of ​​the material, but also constructs a micro-channel system, providing a spatial environment for the storage, transmission and release of nutrients.

[0046] At the same time, the phenolic compounds produced during the degradation of peanut straw-illite can undergo oxidative coupling reactions with the active polysaccharides in seaweed essence to form macromolecular complexes with strong metal ion chelating ability and good nutrient sustained-release properties.

[0047] Thanks to the complementarity of the surface charge distribution of the two materials, a more uniform and stable electric field distribution is formed, which significantly improves the ion exchange efficiency and nutrient transfer rate. In addition, the two composite materials can also regulate the chemical properties of the rhizosphere microenvironment through synergistic effects: the alginate in the seaweed essence regulates the pH value through dissociation, while the illite maintains the stability of the rhizosphere environment through its buffering capacity, jointly creating chemical conditions that are conducive to nutrient activation and transformation.

[0048] However, both seaweed extract-water lettuce powder and peanut straw-illite contain a variety of minerals, which will cause ion competition during plant absorption and reduce nutrient utilization efficiency. To solve this problem, β-glucan was introduced. The molecular chain of β-glucan can chelate mineral ions in a more stable form, reduce mutual repulsion and competition between ions, and enable various nutrient ions to be absorbed by plants in a more balanced and efficient manner.

[0049] The preparation method of peanut straw-illite comprises:

[0050] S11. Chop the peanut straw into 3-5 cm to obtain chopped peanut straw, dry the chopped peanut straw at 65-70° C. for 24-36 h to obtain dried peanut straw, crush the dried peanut straw through a 100-mesh sieve to obtain crushed peanut straw, soak the crushed peanut straw in a 4% NaOH solution, stir at 90-100° C. for 4-5 h to obtain soaked peanut straw, filter the soaked peanut straw and wash with water until the pH is 7.0-7.5 to obtain washed peanut straw, dry the washed peanut straw at 60-70° C. for 12-24 h to obtain pretreated peanut straw;

[0051] S12. crushing the illite through a 200-mesh sieve to obtain sieved illite, activating the sieved illite with 1 mol / L sulfuric acid, stirring at room temperature for 4 to 5 hours to obtain activated illite, filtering the activated illite and washing with water until the pH value is 7.0 to 7.5 to obtain washed illite, and drying the washed illite at 105 to 110° C. for 6 to 7 hours to obtain pretreated illite;

[0052] S13. Adding the pretreated peanut straw to a 3% polyethyleneimine solution and stirring at 60 to 70° C. for 2 to 3 h to obtain modified peanut straw, filtering the modified peanut straw to obtain filtered peanut straw, and drying the filtered peanut straw at 50 to 60° C. for 3 to 4 h to obtain dried peanut straw;

[0053] S14. Mixing the dried peanut straw with the pretreated illite to obtain a mixture, adding the mixture to deionized water, and adding 1% carboxymethyl cellulose to obtain a mixed solution, stirring the mixed solution at 75 to 80° C. for 3 to 4 hours to obtain a stirred mixed solution, and adjusting the pH of the stirred mixed solution to 6.5 to 7.0 to obtain a pH-adjusted mixed solution;

[0054] S15. Ultrasonicate the pH-adjusted mixed solution for 45 to 50 minutes to obtain an ultrasonically treated mixed solution, centrifuge the ultrasonically treated mixed solution at 5000 to 6000 r / min for 20 to 30 minutes to obtain a centrifuged mixture, dry the centrifuged mixture at 80 to 90° C. for 12 to 24 hours to obtain a dried mixture, and crush the dried mixture through an 80-mesh sieve to obtain peanut straw-illite.

[0055] The preparation method of the seaweed essence-water lettuce powder comprises:

[0056] S21. The water hyacinth was washed and drained to obtain the washed water hyacinth, the washed water hyacinth was dried at 60 to 70 ° C for 24 to 36 h to obtain dried water hyacinth, the dried water hyacinth was crushed through a 200 to 300 mesh sieve to obtain water hyacinth powder;

[0057] S22. Washing and cutting the seaweed to obtain the cut seaweed, adding 0.1-0.15 mol / L hydrochloric acid to the cut seaweed and extracting at 70-80° C. for 2-3 h to obtain the extracted seaweed, filtering and concentrating the extracted seaweed to obtain seaweed essence;

[0058] S23. Take water hyacinth powder and add 3-5% NaOH solution, and stir and treat at 50-60 ℃ for 2-3h to obtain treated water hyacinth powder, filter the treated water hyacinth powder and rinse with water 3-4 times to obtain rinsed water hyacinth powder, and dry the rinsed water hyacinth powder at 50-60 ℃ for 4-5h to obtain activated water hyacinth powder;

[0059] S24. The activated water lettuce powder and seaweed extract are mixed and added to deionized water, and 0.5-1.0% carboxymethyl cellulose is added to obtain a first mixed solution, the first mixed solution is stirred at 70-80° C. for 2-4 hours to obtain a second mixed solution, and the pH of the second mixed solution is adjusted to 6.5-7.0 to obtain a third mixed solution;

[0060] S25. Ultrasonicate the third mixed solution for 30 to 40 minutes to obtain a mixed solution after ultrasound, centrifuge the mixed solution after ultrasound at 4000 to 5000 r / min for 15 to 20 minutes to obtain a centrifuged mixed solution, spray-dry the centrifuged mixed solution at 60 to 70°C to obtain a dried product, granulate the dried product and pass it through an 80 to 90 mesh sieve to obtain seaweed essence-water lettuce powder.

[0061] A method for preparing a plant nutrient absorption enhancer, which is applied to the plant nutrient absorption enhancer, comprises the following steps:

[0062] S31. The glyceryl monostearate is heated to 80 to 85° C. to obtain melted glyceryl monostearate, the melted glyceryl monostearate is added to deionized water, and the temperature is controlled at 80 to 85° C. to obtain an aqueous solution of glyceryl monostearate, and the aqueous solution of glyceryl monostearate is sheared and stirred at 3000 to 4000 r / min for 10 to 20 min to obtain an emulsion;

[0063] S32. Weigh sodium citrate and dissolve it in deionized water to obtain a sodium citrate solution, add β-glucan to the sodium citrate solution, and stir at a temperature of 60 to 70 ° C and a speed of 300 to 400 r / min for 30 to 40 min to obtain a solution A;

[0064] S33. Add seaweed extract-water lettuce powder to solution A, and stir at 400-500 r / min for 20-30 min to obtain solution B, add the emulsion to solution B, continue stirring for 15-20 min to obtain solution C, add peanut straw-illite to solution C, and adjust the pH to 6.8-7.2 to obtain solution D;

[0065] S34. The solution D was shear-stirred at 4000-5000 r / min for 10-20 min to obtain a solution E, and the solution E was ultrasonically treated for 30-40 min to obtain a solution F;

[0066] S35. The solution F is spray-dried at 80-90° C. to obtain a product, and the product is granulated and passed through a 100-mesh sieve to obtain a plant nutrient absorption enhancer.

[0067] Example 2: This example discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 20 parts of seaweed essence-water lettuce powder, 2 parts of glycerol monostearate, 1 part of β-glucan, 3 parts of sodium citrate, and 30 parts of peanut straw-illite.

[0068] The preparation method of seaweed essence-water lettuce powder and peanut straw-illite in this embodiment is consistent with that in Example 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in Example 1.

[0069] Example 3: This example discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 25 parts of seaweed essence-water lettuce powder, 3 parts of glycerol monostearate, 2 parts of β-glucan, 4 parts of sodium citrate, and 35 parts of peanut straw-illite.

[0070] The preparation method of seaweed essence-water lettuce powder and peanut straw-illite in this embodiment is consistent with that in Example 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in Example 1.

[0071] Example 4: This example discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22.5 parts of seaweed essence-water lettuce powder, 2.5 parts of glycerol monostearate, 1.5 parts of β-glucan, 3.5 parts of sodium citrate, and 32.5 parts of peanut straw-illite.

[0072] The preparation method of seaweed essence-water lettuce powder and peanut straw-illite in this embodiment is consistent with that in Example 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in Example 1.

[0073] Control group 1: This example discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 2.2 parts of glycerol monostearate, 1.8 parts of β-glucan, 3.2 parts of sodium citrate, and 32 parts of peanut straw-illite.

[0074] The preparation method of peanut straw-illite in this embodiment is consistent with that in Example 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in Example 1.

[0075] Control group 2: This example discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22 parts of seaweed extract, 2.2 parts of glycerol monostearate, 1.8 parts of β-glucan, 3.2 parts of sodium citrate, and 32 parts of peanut straw-illite.

[0076] The preparation method of seaweed extract and peanut straw-illite in this embodiment is consistent with that in Example 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in Example 1.

[0077] Control group 3: This example discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22 parts of water lettuce powder, 2.2 parts of glycerol monostearate, 1.8 parts of β-glucan, 3.2 parts of sodium citrate, and 32 parts of peanut straw-illite.

[0078] The preparation method of water lettuce powder and peanut straw-illite in this embodiment is consistent with that in Example 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in Example 1.

[0079] Control group 4: This embodiment discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22 parts of seaweed essence-water lettuce powder, 2.2 parts of glycerol monostearate, 1.8 parts of β-glucan, and 3.2 parts of sodium citrate.

[0080] The preparation method of the seaweed essence-water lettuce powder in this embodiment is consistent with that in embodiment 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in embodiment 1.

[0081] Control group 5: This embodiment discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22 parts of seaweed essence-water lettuce powder, 2.2 parts of glycerol monostearate, 1.8 parts of β-glucan, 3.2 parts of sodium citrate, and 32 parts of peanut straw.

[0082] The preparation method of seaweed essence-water lettuce powder and peanut straw in this embodiment is consistent with that in embodiment 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in embodiment 1.

[0083] Control group 6: This embodiment discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22 parts of seaweed essence-water lettuce powder, 2.2 parts of glycerol monostearate, 1.8 parts of β-glucan, 3.2 parts of sodium citrate, and 32 parts of illite.

[0084] The preparation method of seaweed essence-water lettuce powder and illite in this embodiment is consistent with that in embodiment 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in embodiment 1.

[0085] Control group 7: This embodiment discloses a plant nutrient absorption enhancer, comprising the following raw materials in parts by weight: 22 parts of seaweed essence-water lettuce powder, 2.2 parts of glycerol monostearate, 3.2 parts of sodium citrate, and 32 parts of peanut straw-illite.

[0086] The preparation method of seaweed essence-water lettuce powder and peanut straw-illite in this embodiment is consistent with that in Example 1. The preparation method of a plant nutrient absorption enhancer in this embodiment is consistent with that in Example 1.

[0087] Test verification:

[0088] 1. Nitrogen adsorption-desorption test: The plant nutrient absorption enhancers of each embodiment group and the control group were weighed, and the specific surface area and porosity were measured using a fully automatic specific surface area and porosity analyzer;

[0089] 2. Surface potential test: The plant nutrient absorption enhancers of each embodiment group and the control group were ultrasonically dispersed for 10 minutes to prepare a suspension with a concentration of 1 mg / mL, and then the potential was measured. The test temperature was 25°C, the electrode distance was 1-2 mm, and the test time was 300 seconds per point;

[0090] 3. Ion chelation test: Prepare simulated nutrient solution, add plant nutrient absorption enhancers of each embodiment group and control group, oscillate in a constant temperature oscillator at 37°C for 2 hours, centrifuge and determine the metal ions (K + , Ca 2+ Mg 2+ )concentration;

[0091] 4. Simulation experiment: Under controlled conditions, potted experiments were conducted using the plant nutrient absorption enhancers of each embodiment group and the control group, and the plant growth was observed and the effects of each group on plant growth were compared. Crop growth indicators were measured: plant height and leaf area; nutrient content was measured: leaf nutrient concentration. (Plant height: measured once a week, leaf area: using a portable leaf area meter, leaf nutrient content: nitrogen content was measured by Kjeldahl method, phosphorus content was measured by spectrophotometry, and potassium, calcium, and magnesium content were measured by atomic absorption spectrometry).

[0092] Table 1 Test results of the physicochemical properties of the plant nutrient absorption enhancers of each embodiment group and the control group

[0093]

[0094] Table 2 Plant growth index and nutrient content test results (after 8 weeks of growth)

[0095]

[0096] From the physical and chemical properties of the materials in Table 1, it can be seen that the example groups (1-4) are significantly better than the control group in terms of specific surface area, porosity, surface potential and ion chelation rate. The specific surface area of ​​the example groups is generally between 430 and 460 m 2 / g, while the control group was only between 320 and 385 m 2 / g, indicating that the composite material has higher adsorption and exchange capabilities. In terms of porosity, the porosity of the example group reached 68 - 72.5%, while that of the control group was only 52 - 61.2%, meaning that the material has a more developed microporous structure inside, which is beneficial to nutrient storage and transmission.

[0097] The surface potential data shows that the values of the example group are all negative (-38.7 to -42.3 mV), while those of the control group are relatively higher (-28.4 to -35.6 mV). The lower negative potential means that the material has stronger ion exchange capabilities and more stable surface characteristics. In terms of the ion chelation rate index, the chelation rates of K + , Ca 2+ and Mg 2+ in the example group are significantly higher than those of the control group, with an increase of approximately 20 - 25 percentage points respectively.

[0098] From the plant growth indicators in Table 2, the example group is significantly superior to the control group in terms of plant height, leaf area, and nutrient content. The plant height of Example 1 reached 45.8 cm, while the highest in the control group was only 32.6 cm; the leaf area increased from 125 - 142 cm 2 in the control group to 156 - 168 cm 2 in the example group. The nutrient contents of nitrogen, phosphorus, potassium, calcium, magnesium, etc. also show a similar trend, and the nutrient contents of the example group are generally 25 - 30% higher than those of the control group.

[0099] These data comprehensively show that the composite material of seaweed essence - water hyacinth powder and peanut straw - illite significantly improves the nutrient adsorption, storage, and release capabilities of the material by constructing a molecular network and a porous structure, and ultimately promotes plant growth and nutrient absorption. The introduction of β - glucan further stabilizes the ionic state, reduces the competition between ions, and significantly improves the nutrient utilization efficiency.

[0100] Finally, it should be noted that: Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plant nutrient absorption enhancer, characterized in that: The invention comprises the following raw materials in parts by weight: 20-25 parts of seaweed essence-water lettuce powder, 2-3 parts of glycerol monostearate, 1-2 parts of beta-glucan, 3-4 parts of sodium citrate and 30-35 parts of peanut straw-illite.

2. A plant nutrient absorption enhancer according to claim 1, characterized in that: The preparation method of peanut straw-illite comprises: S11. Chop the peanut straw into 3-5 cm to obtain chopped peanut straw, dry the chopped peanut straw at 65-70° C. for 24-36 h to obtain dried peanut straw, crush the dried peanut straw through a 100-mesh sieve to obtain crushed peanut straw, soak the crushed peanut straw in a 4% NaOH solution, stir at 90-100° C. for 4-5 h to obtain soaked peanut straw, filter the soaked peanut straw and wash with water until the pH is 7.0-7.5 to obtain washed peanut straw, dry the washed peanut straw at 60-70° C. for 12-24 h to obtain pretreated peanut straw; S12. crushing the illite through a 200-mesh sieve to obtain sieved illite, activating the sieved illite with 1 mol / L sulfuric acid, stirring at room temperature for 4 to 5 hours to obtain activated illite, filtering the activated illite and washing with water until the pH value is 7.0 to 7.5 to obtain washed illite, and drying the washed illite at 105 to 110° C. for 6 to 7 hours to obtain pretreated illite; S13. Adding the pretreated peanut straw to a 3% polyethyleneimine solution and stirring at 60 to 70° C. for 2 to 3 h to obtain modified peanut straw, filtering the modified peanut straw to obtain filtered peanut straw, and drying the filtered peanut straw at 50 to 60° C. for 3 to 4 h to obtain dried peanut straw; S14. Mixing the dried peanut straw with the pretreated illite to obtain a mixture, adding the mixture to deionized water, and adding 1% carboxymethyl cellulose to obtain a mixed solution, stirring the mixed solution at 75 to 80° C. for 3 to 4 hours to obtain a stirred mixed solution, and adjusting the pH of the stirred mixed solution to 6.5 to 7.0 to obtain a pH-adjusted mixed solution; S15. Ultrasonicate the pH-adjusted mixed solution for 45 to 50 minutes to obtain an ultrasonically treated mixed solution, centrifuge the ultrasonically treated mixed solution at 5000 to 6000 r / min for 20 to 30 minutes to obtain a centrifuged mixture, dry the centrifuged mixture at 80 to 90° C. for 12 to 24 hours to obtain a dried mixture, and crush the dried mixture through an 80-mesh sieve to obtain peanut straw-illite.

3. A plant nutrient absorption enhancer according to claim 1, characterized in that: The preparation method of the seaweed essence-water lettuce powder comprises: S21. The water hyacinth was washed and drained to obtain the washed water hyacinth, the washed water hyacinth was dried at 60 to 70 ° C for 24 to 36 h to obtain dried water hyacinth, the dried water hyacinth was crushed through a 200 to 300 mesh sieve to obtain water hyacinth powder; S22. Washing and cutting the seaweed to obtain the cut seaweed, adding 0.1-0.15 mol / L hydrochloric acid to the cut seaweed and extracting at 70-80° C. for 2-3 h to obtain the extracted seaweed, filtering and concentrating the extracted seaweed to obtain seaweed essence; S23. Take water hyacinth powder and add 3-5% NaOH solution, and stir and treat at 50-60 ℃ for 2-3h to obtain treated water hyacinth powder, filter the treated water hyacinth powder and rinse with water 3-4 times to obtain rinsed water hyacinth powder, and dry the rinsed water hyacinth powder at 50-60 ℃ for 4-5h to obtain activated water hyacinth powder; S24. The activated water lettuce powder and seaweed extract are mixed and added to deionized water, and 0.5-1.0% carboxymethyl cellulose is added to obtain a first mixed solution, the first mixed solution is stirred at 70-80° C. for 2-4 hours to obtain a second mixed solution, and the pH of the second mixed solution is adjusted to 6.5-7.0 to obtain a third mixed solution; S25. Ultrasonicate the third mixed solution for 30 to 40 minutes to obtain a mixed solution after ultrasound, centrifuge the mixed solution after ultrasound at 4000 to 5000 r / min for 15 to 20 minutes to obtain a centrifuged mixed solution, spray-dry the centrifuged mixed solution at 60 to 70°C to obtain a dried product, granulate the dried product and pass it through an 80 to 90 mesh sieve to obtain seaweed essence-water lettuce powder.

4. A method for preparing a plant nutrient absorption enhancer, which is used to prepare the plant nutrient absorption enhancer as claimed in any one of claims 1 to 3, characterized in that: The method comprises the following steps: S31. The glyceryl monostearate is heated to 80 to 85° C. to obtain melted glyceryl monostearate, the melted glyceryl monostearate is added to deionized water, and the temperature is controlled at 80 to 85° C. to obtain an aqueous solution of glyceryl monostearate, and the aqueous solution of glyceryl monostearate is sheared and stirred at 3000 to 4000 r / min for 10 to 20 min to obtain an emulsion; S32. Weigh sodium citrate and dissolve it in deionized water to obtain a sodium citrate solution, add β-glucan to the sodium citrate solution, and stir at a temperature of 60 to 70 ° C and a speed of 300 to 400 r / min for 30 to 40 min to obtain a solution A; S33. Add seaweed extract-water lettuce powder to solution A, and stir at 400-500 r / min for 20-30 min to obtain solution B, add the emulsion to solution B, continue stirring for 15-20 min to obtain solution C, add peanut straw-illite to solution C, and adjust the pH to 6.8-7.2 to obtain solution D; S34. The solution D was shear-stirred at 4000-5000 r / min for 10-20 min to obtain a solution E, and the solution E was ultrasonically treated for 30-40 min to obtain a solution F; S35. The solution F is spray-dried at 80-90° C. to obtain a product, and the product is granulated and passed through a 100-mesh sieve to obtain a plant nutrient absorption enhancer.

Images