Molybdenum-boron synergistic control type macroelement water-soluble fertilizer and preparation process thereof

Abstract

The invention relates to the technical field of fertilizers, and discloses a molybdenum-boron synergistic control type macroelement water-soluble fertilizer, which is prepared from the following raw materials in parts by weight: nitrate nitrogen, ammonium nitrogen, ammonium polyphosphate, potassium oxide, chelated magnesium (MgO), trace elements, a stress-resistant enhancer, a synergistic control agent and a stabilizer, the trace elements are composed of ammonium molybdate, a boric acid-glycerol compound, chelated zinc, chelated manganese (Mn-EDTA) and a chelating agent. According to the molybdenum-boron synergistic control type macroelement water-soluble fertilizer and the preparation process thereof, the ammonium molybdate and the boric acid-glycerol compound are added into the fertilizer, so that the nutrient deficiency symptom can be effectively and synergistically prevented, the fungal disease resistance can be effectively improved by adding the salicylic acid and the nano silicon dioxide, and meanwhile, the effect of preventing and treating the macroelement is achieved. By adding the chlamydomonas rubra enzymolysis extract containing natural abscisic acid, potassium silicate and polyaspartic acid, the high temperature resistance, drought resistance and heavy metal pollution resistance of the fertilizer can be effectively improved, so that the effect of the whole water-soluble fertilizer is improved, and the application range of the water-soluble fertilizer can be widened.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, in particular to a molybdenum-boron synergistic control type macro-element water-soluble fertilizer and a preparation process thereof. Background Art

[0002] Water-soluble fertilizer is a multi-component compound fertilizer that can be completely soluble in water. It can dissolve quickly in water and is more easily absorbed by crops. Its absorption and utilization rate is relatively high. More importantly, it can be used in facility agriculture such as sprinkler and drip irrigation to achieve water-fertilizer integration and save water, fertilizer and labor.

[0003] In the preparation process of water-soluble fertilizers, molybdenum is one of the ingredients for preventing plant diseases and is usually used in water-soluble fertilizers. Molybdenum participates in the biological nitrogen fixation process and is used to prevent root maldevelopment, yellow spot disease, mosaic disease, edge and tail disease, yellowing in the seedling stage, small fruits, empty and barren fruits, etc.; for example, the invention patent with announcement number CN116621614A discloses a production process for molybdenum fertilizer and the molybdenum fertilizer produced and its application. It uses dry tailings and water (containing soluble molybdenum salts) in the molybdenum tailings pond as raw materials to produce molybdenum fertilizer for crop growth, which fundamentally solves the health problems of people in molybdenum-deficient areas, makes due contributions to the local sand and gravel soil management, and is beneficial to environmental protection.

[0004] However, the introduction of molybdenum components into water-soluble fertilizers can improve the disease prevention ability of plants during their growth process. However, the single molybdenum component makes the efficacy of water-soluble fertilizers relatively single, which leads to a relatively single effect of water-soluble fertilizers in preventing and controlling plant diseases, affecting the scope of application of water-soluble fertilizers during their use. Therefore, a molybdenum-boron synergistic prevention and control type macro-element water-soluble fertilizer and its preparation process are proposed to solve the above problems. Summary of the Invention

[0005] (1) Technical problems solved In response to the shortcomings of the existing technology, the present invention provides a molybdenum-boron synergistic control type macro-element water-soluble fertilizer and its preparation process, which has the advantages of diversified control effects to increase the scope of application of fertilizers, and solves the problem of relatively single functionality.

[0006] (2) Technical solution To achieve the above-mentioned relatively single functional purpose, the present invention provides the following technical solution: a molybdenum-boron synergistic control type macro-element water-soluble fertilizer, comprising the following raw materials in proportions by weight: 100-150 parts of nitrate nitrogen, 20-50 parts of ammonium nitrogen, 70-100 parts of ammonium polyphosphate, 120-180 parts of potassium oxide, 15-25 parts of chelated magnesium (MgO), 6.0-12.0 parts of trace elements, 5.5-13.0 parts of stress resistance enhancer, 0.8-2.3 parts of synergistic control agent and 1.2-2.5 parts of stabilizer; The trace elements are composed of 0.5-1.0 parts of ammonium molybdate, 2.0-4.0 parts of boric acid-glycerol complex, 1.5-2.5 parts of chelated zinc, 0.8-1.5 parts of chelated manganese (Mn-EDTA) and 1.0-3.0 parts of chelating agent.

[0007] Preferably, it is characterized in that the stress resistance enhancer consists of potassium silicate (K2SiO3), nano-silica sol and Chlamydomonas enzymatic hydrolysis extract, and the synergistic control agent consists of polyglutamic acid and salicylic acid.

[0008] Preferably, the chelating agent is L-hydroxyproline, which serves as a secondary chelating agent for zinc / manganese to promote foliar absorption, and the stabilizer is composed of HEDP, sodium gluconate, 5-aminolevulinic acid and polyaspartic acid.

[0009] Preferably, the ratio of nitrate nitrogen to ammonium nitrogen is 3:1-5:1, and the ammonium molybdate and boric acid-glycerol complex adopt a Mo:B ratio of 1:2-3.

[0010] Another technical problem to be solved by the present invention is to provide a molybdenum-boron synergistic control type macronutrient water-soluble fertilizer and a preparation process thereof, comprising the following steps: S1. Raw material pretreatment: S1.1. Synthesis of Boric Acid-Glycerol Complex: Boric acid and glycerol were placed in a reaction vessel at a temperature of 43-47°C for 25-30 minutes to form a transparent complex solution, which was then cooled to 22-28°C for later use (to avoid boron crystallization caused by high temperatures). S1.2. Activation of Nano-Silica Sol: Add nano-silica to potassium silicate solution and place in ultrasonic disperser for ultrasonic dispersion to form stable silica sol; S2. Main body dissolution and chelation: S2.1. Dissolution of Macroelements: Add the following to the reactor in the following order: deionized water (45-55°C), nitrate nitrogen, ammonium nitrogen (ratio 3:1-5:1), ammonium polyphosphate (to provide P2O5), and potassium oxide. Stir the reactor at 180-220 rpm until all ingredients are completely dissolved. S2.2, magnesium, zinc and manganese chelation: Then, chelated magnesium, chelated zinc, and chelated manganese are added in sequence, and L-hydroxyproline is added. The temperature is controlled at 50-60°C and the reaction is carried out for 25-35 minutes to form a ternary chelate. S2.3, Synergistic introduction of molybdenum and boron: Slowly add ammonium molybdate and the boric acid-glycerol complex pretreated in step S1.1, maintaining Mo:B = 1:(2-4), and stir for 40-45 minutes; S3. Addition of additives: S3.1, stress resistance enhancer: add the enzymatic hydrolyzed extract of Chlamydomonas fulva to the activated silica sol, heat it to 40°C at a rate of 4-6°C / min, and mix at this temperature for 10-20 minutes; S3.2, Synergistic control agent: premix polyglutamic acid and salicylic acid and add dropwise (to avoid acidic degradation); S3.3, Stabilizer: Add HEDP → sodium gluconate → polyaspartic acid, 5-aminolevulinic acid in sequence (add photosensitizer last); S4, post-processing: S4.1. pH fine adjustment: Use MES buffer to stabilize the pH of the entire system at 5.8-6.2; S4.2. Low-temperature concentration and drying: The material after pH adjustment in step S4.1 is placed in a spray drying tower for concentration and drying. The spray drying air inlet temperature is 180°C → the air outlet temperature is 85°C (to protect the activity of the functional additive); S4.3. Anti-crystallization guarantee process: After adding sodium gluconate, start high-frequency oscillation (45~55Hz) and continue for 22~26 minutes. The finished product is frozen at -5℃ and is qualified if no crystals are precipitated.

[0011] The frequency of ultrasonic dispersion in step S1.2 is controlled at 35-45 kHz and the time is 15-25 min. The pH value of the dropwise addition of polyglutamic acid and salicylic acid in step S3.2 needs to be controlled at 5.8-6.2.

[0012] Preferably, the detection point for pH detection in step S4.1 is precisely at the reactor outlet and the finished product tank, and in step S4.2, the moisture content of the dried material is controlled to be ≤2.0%.

[0013] (3) Beneficial effects Compared with the prior art, the present invention provides a molybdenum-boron synergistic control type macronutrient water-soluble fertilizer and a preparation process thereof, which has the following beneficial effects: 1. The molybdenum-boron synergistic macro-element water-soluble fertilizer and its preparation process can effectively prevent nutrient deficiency by adding ammonium molybdate and boric acid-glycerol complex to the fertilizer, effectively improve the resistance of crops to fungal diseases by adding salicylic acid and nano-silicon dioxide, and effectively improve the resistance of crops to high temperature, drought and heavy metal pollution by adding enzymatic hydrolysis extract of Chlamydomonas aeruginosa containing natural abscisic acid, potassium silicate and polyaspartic acid, so as to improve the efficacy of the entire water-soluble fertilizer and expand the scope of application of the water-soluble fertilizer.

[0014] 2. This molybdenum-boron synergistic macronutrient water-soluble fertilizer and its preparation process can improve the nitrogen utilization rate of the fertilizer and the effectiveness of phosphorus by controlling the ratio of nitrate nitrogen to ammonium nitrogen and increasing the amount of ammonium polyphosphate. At the same time, controlling the molybdenum-boron ratio and adding 5-aminolevulinic acid can improve the pollen vitality of crops, the fertilization rate during flowering and the photosynthetic rate.

[0015] 3. This molybdenum-boron synergistic control type macro-element water-soluble fertilizer and its preparation process, HEDP + sodium gluconate, γ-polyglutamic acid + salicylic acid and silica sol + Chlamydomonas extract in the fertilizer can effectively prevent the precipitation of boron and molybdenum, improve the water utilization efficiency when the fertilizer is dissolved in water, and provide dual protection of physical barrier (silicon) + biochemical stress resistance (ABA). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0018] Example 1: A molybdenum-boron synergistic macronutrient water-soluble fertilizer, comprising the following raw materials in the following proportions by weight: 120 parts of nitrate nitrogen, 30 parts of ammonium nitrogen, 85 parts of ammonium polyphosphate, 150 parts of potassium oxide, 20 parts of chelated magnesium (MgO), 8.6 parts of trace elements, 8.5 parts of stress enhancer, 1.2 parts of synergistic control agent, and 2.5 parts of stabilizer; The stress-resistance enhancer is composed of potassium silicate (K2SiO3), nano-silica sol and enzymatic hydrolysis extract of Chlamydomonas syringae; the synergistic control agent is composed of polyglutamic acid and salicylic acid; the stabilizer is composed of HEDP, sodium gluconate, 5-aminolevulinic acid and polyaspartic acid; The trace elements are composed of 0.7 parts of ammonium molybdate, 3.0 parts of boric acid-glycerol complex, 2.0 parts of chelated zinc, 0.9 parts of chelated manganese (Mn-EDTA) and 2.0 parts of chelating agent. The chelating agent is L-hydroxyproline, which acts as a secondary chelator of zinc / manganese to promote foliar absorption.

[0019] It should be noted that the ratio of nitrate nitrogen to ammonium nitrogen is 4:1, and the ammonium molybdate and boric acid-glycerol complex adopt a Mo:B ratio of 1:2.8.

[0020] A preparation process of a molybdenum-boron synergistic macronutrient water-soluble fertilizer comprises the following steps: S1. Raw material pretreatment: S1.1. Synthesis of Boric Acid-Glycerol Complex: Boric acid and glycerol were placed in a reactor at 45°C for 30 minutes to form a transparent complex solution, which was then cooled to 22°C for later use (to avoid boron crystallization caused by high temperature). S1.2. Activation of Nano-Silica Sol: Add nano-silica to potassium silicate solution and place in ultrasonic disperser for ultrasonic dispersion. The frequency of ultrasonic dispersion is controlled at 40 kHz for 15 minutes, and the particle size is less than 20 nm to form a stable silica sol. S2. Main body dissolution and chelation: S2.1. Dissolution of Macroelements: Add deionized water (45°C), nitrate nitrogen, ammonium nitrogen, ammonium polyphosphate (to provide P2O5), and potassium oxide to the reactor in the following order. Stir the reactor at 180 rpm until all components are completely dissolved. S2.2, magnesium, zinc and manganese chelation: Then, chelated magnesium, chelated zinc, and chelated manganese were added in sequence, and L-hydroxyproline was added. The temperature was controlled at 50°C and the reaction was carried out for 25 minutes to form a ternary chelate. S2.3, Synergistic introduction of molybdenum and boron: Then slowly add ammonium molybdate and the boric acid-glycerol complex pretreated in step S1.1, maintaining the Mo:B ratio at 1:2.8, and stir for 45 minutes; S3. Addition of additives: S3.1, stress resistance enhancer: add the enzymatic hydrolyzed extract of Chlamydomonas spp. to the activated silica sol, heat it to 40°C at a rate of 4°C / min, and mix at this temperature for 10 minutes; S3.2, Synergistic control agent: Premix polyglutamic acid and salicylic acid and then add dropwise (to avoid acidic degradation). The pH of the polyglutamic acid and salicylic acid should be controlled at 5.8. S3.3, Stabilizer: Add HEDP → sodium gluconate → polyaspartic acid, 5-aminolevulinic acid in sequence (add photosensitizer last); S4, post-processing: S4.1. pH fine adjustment: Use MES buffer to stabilize the pH of the entire system at 5.8. The pH detection points are precisely at the reactor outlet and the finished product tank; S4.2. Low-temperature concentration and drying: The material after pH adjustment in step S4.1 is placed in a spray drying tower for concentration and drying. The spray drying air inlet temperature is 180°C → the air outlet temperature is 85°C (to protect the activity of the functional additive). The moisture content of the dried material is controlled to ≤1.8%. S4.3. Anti-crystallization guarantee process: After adding sodium gluconate, start high-frequency oscillation (50Hz) and continue for 25 minutes. The finished product is frozen at -5℃ and is qualified if no crystals are precipitated.

[0021] In this embodiment, the incidence of sclerotinia disease can be effectively reduced (32% → 15.4% in the control conventional field), and the grain yield is improved (210 kg / mu → 270 kg / mu in the control conventional field); the pollen vitality is improved, and the incidence of "flowers without seeds" is reduced to below 3-5%.

[0022] Example 2: A molybdenum-boron synergistic macronutrient water-soluble fertilizer, comprising the following raw materials in the following proportions by weight: 135 parts of nitrate nitrogen, 45 parts of ammonium nitrogen, 95 parts of ammonium polyphosphate, 165 parts of potassium oxide, 20 parts of chelated magnesium (MgO), 9.8 parts of trace elements, 12.5 parts of a stress enhancer, 1.6 parts of a synergistic control agent, and 3.6 parts of a stabilizer; The stress resistance enhancer is composed of potassium silicate (K2SiO3), nano-silica sol and enzymatic hydrolysis extract of Chlamydomonas syringae; the synergistic control agent is composed of polyglutamic acid and salicylic acid; the stabilizer is composed of HEDP, sodium gluconate and polyaspartic acid; The trace elements are composed of 0.8 parts of ammonium molybdate, 3.5 parts of boric acid-glycerol complex, 1.8 parts of chelated zinc, 1.2 parts of chelated manganese (Mn-EDTA) and 2.5 parts of chelating agent. The chelating agent is L-hydroxyproline, which acts as a secondary chelator of zinc / manganese to promote foliar absorption.

[0023] It should be noted that the ratio of nitrate nitrogen to ammonium nitrogen is 3:1, and the ammonium molybdate and boric acid-glycerol complex adopt a Mo:B ratio of 1:2.6.

[0024] A preparation process of a molybdenum-boron synergistic macronutrient water-soluble fertilizer comprises the following steps: S1. Raw material pretreatment: S1.1. Synthesis of Boric Acid-Glycerol Complex: Boric acid and glycerol were placed in a reactor at 45°C for 28 minutes to form a transparent complex solution, which was then cooled to 26°C for later use (to avoid boron crystallization caused by high temperature). S1.2. Activation of Nano-Silica Sol: Add nano-silica to potassium silicate solution and place in ultrasonic disperser for ultrasonic dispersion at a frequency of 40 kHz for 20 minutes to form a stable silica sol. S2. Main body dissolution and chelation: S2.1. Dissolution of Macroelements: Add the following to the reactor in the following order: deionized water (50°C), nitrate nitrogen, ammonium nitrogen (3:1 ratio), ammonium polyphosphate (to provide P2O5), and potassium oxide. Stir the reactor at 200 rpm until all components are completely dissolved. S2.2, magnesium, zinc and manganese chelation: Then, chelated magnesium, chelated zinc, and chelated manganese were added in sequence, and L-hydroxyproline was added. The temperature was controlled at 55°C and the reaction was carried out for 30 minutes to form a ternary chelate. S2.3, Synergistic introduction of molybdenum and boron: Then slowly add ammonium molybdate and the boric acid-glycerol complex pretreated in step S1.1, and stir for 43 minutes; S3. Addition of additives: S3.1, stress resistance enhancer: add the enzymatic hydrolyzed extract of Chlamydomonas fulva to the activated silica sol, heat it to 42°C at a rate of 6°C / min, and mix at this temperature for 15 minutes; S3.2, Synergistic control agent: Premix polyglutamic acid and salicylic acid and then add dropwise (to avoid acidic degradation). The pH of the polyglutamic acid and salicylic acid should be controlled at 6.0 during the addition. S3.3, Stabilizer: Add HEDP → sodium gluconate → polyaspartic acid (0.8 parts), 5-aminolevulinic acid (add last for photosensitivity protection) in sequence; S4, post-processing: S4.1. pH fine adjustment: Use MES buffer to stabilize the pH of the entire system at 5.9 ± 0.1. The pH detection point is precisely monitored at the reactor outlet in real time. S4.2. Low-temperature concentration and drying: The material after pH adjustment in step S4.1 is placed in a spray drying tower for concentration and drying. The spray drying air inlet temperature is 180°C → the air outlet temperature is 85°C (to protect the activity of the functional additive). The moisture content of the dried material is controlled to ≤ 2.0%; S4.3. Anti-crystallization guarantee process: After adding sodium gluconate, start high-frequency oscillation (55Hz) and continue for 24 minutes. The finished product is frozen at -5℃ and is qualified if no crystals are precipitated.

[0025] In this embodiment, the vitamin C content of the fruit is significantly increased, the sugar-acid ratio is optimized, the powdery mildew prevention effect is significantly improved, the number of times chemical pesticides are used is reduced, and the yield is increased by 30-35%. Example 3: A molybdenum-boron synergistic macronutrient water-soluble fertilizer, comprising the following raw materials in the following proportions by weight: 110 parts of nitrate nitrogen, 25 parts of ammonium nitrogen, 75 parts of ammonium polyphosphate, 175 parts of potassium oxide, 25 parts of chelated magnesium (MgO), 11 parts of trace elements, 13.0 parts of a stress enhancer, 0.9 parts of a synergistic control agent, and 2 parts of a stabilizer; The stress-resistance enhancer is composed of potassium silicate (K2SiO3), nano-silica sol and enzymatic hydrolysis extract of Chlamydomonas syringae; the synergistic control agent is composed of polyglutamic acid and salicylic acid; the stabilizer is composed of HEDP, sodium gluconate, 5-aminolevulinic acid and polyaspartic acid; The trace elements are composed of 0.6 parts of ammonium molybdate, 3.8 parts of boric acid-glycerol complex, 2.2 parts of chelated zinc, 1.4 parts of chelated manganese (Mn-EDTA) and 3.0 parts of chelating agent. The chelating agent is L-hydroxyproline, which acts as a secondary chelator of zinc / manganese to promote foliar absorption.

[0026] It should be noted that the ratio of nitrate nitrogen to ammonium nitrogen is 4.4:1, and the ammonium molybdate and boric acid-glycerol complex adopt a Mo:B ratio of 1:3.0.

[0027] A preparation process of a molybdenum-boron synergistic macronutrient water-soluble fertilizer comprises the following steps: S1. Raw material pretreatment: S1.1. Synthesis of Boric Acid-Glycerol Complex: Boric acid and glycerol were added to a reactor with the amount of glycerol being 1.2 times that of boric acid. The reactor temperature was controlled at 47°C for 30 minutes to form a transparent complex solution, which was then cooled to 28°C for later use (to avoid boron crystallization caused by high temperature). The dissolution rate reached 38%. S1.2. Activation of Nano-Silica Sol: Add nano-silica to potassium silicate solution and place in ultrasonic disperser for ultrasonic dispersion. The frequency of ultrasonic dispersion is controlled at 45kHz, 58℃, and the time is 30min to form a stable silica sol with a chelation rate of >92%. S2. Main body dissolution and chelation: S2.1. Dissolution of Macroelements: Add the following to the reactor in the following order: deionized water (55°C), nitrate nitrogen, ammonium nitrogen (4.4:1 ratio), ammonium polyphosphate (to provide P2O5), and potassium oxide. Stir the reactor at 220 rpm until all components are completely dissolved. S2.2, magnesium, zinc and manganese chelation: Then, chelated magnesium, chelated zinc, and chelated manganese were added in sequence, and L-hydroxyproline was added. The temperature was controlled at 60°C and the reaction was carried out for 35 minutes to form a ternary chelate. S2.3, Synergistic introduction of molybdenum and boron: Then slowly add ammonium molybdate and the boric acid-glycerol complex pretreated in step S1.1, and stir for 45 minutes; S3. Addition of additives: S3.1, stress resistance enhancer: add the enzymatic hydrolyzed extract of Chlamydomonas fulva to the activated silica sol, heat it to 40°C at a rate of 6°C / min, and mix at this temperature for 20 minutes; S3.2, Synergistic control agent: Premix polyglutamic acid and salicylic acid and then add dropwise (to avoid acidic degradation). The pH of the polyglutamic acid and salicylic acid should be controlled at 6.2 during the addition. S3.3, Stabilizer: Add HEDP → sodium gluconate → polyaspartic acid, 5-aminolevulinic acid in sequence (add photosensitizer last); S4, post-processing: S4.1. pH fine adjustment: Use MES buffer to stabilize the pH of the entire system at 6.2. The pH detection points are precisely at the reactor outlet and the finished product tank; S4.2. Low-temperature concentration and drying: The material after pH adjustment in step S4.1 is placed in a spray drying tower for concentration and drying. The spray drying air inlet temperature is 180°C → the air outlet temperature is 82°C (to protect the activity of the functional adjuvant). At the same time, the temperature is lower than the ABA decomposition threshold of 85°C for Chlamydomonas fulva. The moisture content of the dried material is controlled to ≤2.0%. S4.3. Anti-crystallization guarantee process: After adding sodium gluconate, start high-frequency oscillation (55Hz) and continue for 26 minutes. The finished product is tested by freezing at -5℃ and then placed for 72 hours without crystal precipitation, which is qualified.

[0028] In this embodiment, the incidence of "fruit shrinkage disease" was significantly reduced; the fruit shape index was improved, and the hardness was 8.2 kg / cm² (control 6.5 kg / cm²); the refrigerated fruit rot rate was significantly reduced, and the shelf life was extended by 13 to 16 days. Comparative Example:

[0029] The beneficial effects of the present invention are as follows: by adding ammonium molybdate and a boric acid-glycerol complex to the fertilizer, nutrient deficiency can be effectively and synergistically prevented; by adding salicylic acid and nano-silica, fungal disease resistance can be effectively improved; and by adding an enzymatic hydrolysis extract of Chlamydomonas aeruginosa containing natural abscisic acid, potassium silicate, and polyaspartic acid, the resistance of the crop to high temperature, drought, and heavy metal pollution can be effectively improved, thereby improving the overall efficacy of the water-soluble fertilizer and also expanding the scope of application of the water-soluble fertilizer. By controlling the ratio of nitrate nitrogen to ammonium nitrogen and increasing the amount of ammonium polyphosphate, the nitrogen utilization rate and phosphorus effectiveness of the fertilizer can be improved. At the same time, controlling the molybdenum-boron ratio and adding 5-aminolevulinic acid can improve crop pollen vitality, fertilization rate during flowering, and photosynthetic rate. The HEDP + sodium gluconate, γ-polyglutamic acid + salicylic acid, and silica sol + Chlamydomonas aeruginosa extract in the fertilizer can effectively prevent boron and molybdenum precipitation, improve water use efficiency when the fertilizer is dissolved in water, and provide the crop with dual protection of physical barrier (silicon) and biochemical stress resistance (ABA).

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A molybdenum-boron synergistic control type macroelement water-soluble fertilizer, characterized in that: The invention comprises the following raw materials in proportions by weight: 100-150 parts of nitrate nitrogen, 20-50 parts of ammonium nitrogen, 70-100 parts of ammonium polyphosphate, 120-180 parts of potassium oxide, 15-25 parts of chelated magnesium (MgO), 6.0-12.0 parts of trace elements, 5.5-13.0 parts of stress resistance enhancer, 0.8-2.3 parts of synergistic control agent and 1.2-2.5 parts of stabilizer; The trace elements are composed of 0.5-1.0 parts of ammonium molybdate, 2.0-4.0 parts of boric acid-glycerol complex, 1.5-2.5 parts of chelated zinc, 0.8-1.5 parts of chelated manganese (Mn-EDTA) and 1.0-3.0 parts of chelating agent.

2. The molybdenum-boron synergistic control type large amount of element water-soluble fertilizer and its preparation process according to claim 1, characterized in that, The stress resistance enhancer consists of potassium silicate (K2SiO3), nano silicon dioxide sol and Chlamydomonas aeruginosa enzymatic hydrolysis extract, and the synergistic control agent consists of polyglutamic acid and salicylic acid.

3. The molybdenum-boron synergistic control type large amount of element water-soluble fertilizer according to claim 1, characterized in that, The chelating agent is L-hydroxyproline, which serves as a secondary chelating agent for zinc / manganese and promotes leaf absorption. The stabilizer consists of HEDP, sodium gluconate, 5-aminolevulinic acid and polyaspartic acid.

4. The molybdenum-boron synergistic control type large amount of element water-soluble fertilizer according to claim 1, characterized in that, The ratio of the nitrate nitrogen to the ammonium nitrogen is 3:1-5:1, and the ammonium molybdate and the boric acid-glycerol complex adopt a Mo:B ratio of 1:2-3.

5. A preparation process of a molybdenum-boron synergistic control type macronutrient water-soluble fertilizer, characterized in that: The following steps are involved: S1. Raw material pretreatment: S1.

1. Synthesis of Boric Acid-Glycerol Complex: Boric acid and glycerol were placed in a reaction vessel at a temperature of 43-47°C for 25-30 minutes to form a transparent complex solution, which was then cooled to 22-28°C for later use (to avoid boron crystallization caused by high temperatures). S1.

2. Activation of Nano-Silica Sol: Add nano-silica to potassium silicate solution and place in ultrasonic disperser for ultrasonic dispersion to form stable silica sol; S2. Main body dissolution and chelation: S2.

1. Dissolution of Macroelements: Add the following to the reactor in the following order: deionized water (45-55°C), nitrate nitrogen, ammonium nitrogen (ratio 3:1-5:1), ammonium polyphosphate (to provide P2O5), and potassium oxide. Stir the reactor at 180-220 rpm until all ingredients are completely dissolved. S2.2, magnesium, zinc and manganese chelation: Then, chelated magnesium, chelated zinc, and chelated manganese are added in sequence, and L-hydroxyproline is added. The temperature is controlled at 50-60°C and the reaction is carried out for 25-35 minutes to form a ternary chelate. S2.3, Synergistic introduction of molybdenum and boron: Slowly add ammonium molybdate and the boric acid-glycerol complex pretreated in step S1.1, maintaining Mo:B = 1:(2-4), and stir for 40-45 minutes; S3. Addition of additives: S3.1, stress resistance enhancer: add the enzymatic hydrolyzed extract of Chlamydomonas fulva to the activated silica sol, heat it to 40°C at a rate of 4-6°C / min, and mix at this temperature for 10-20 minutes; S3.2, Synergistic control agent: premix polyglutamic acid and salicylic acid and add dropwise (to avoid acidic degradation); S3.3, Stabilizer: Add HEDP → sodium gluconate → polyaspartic acid, 5-aminolevulinic acid in sequence (add photosensitizer last); S4, post-processing: S4.

1. pH fine adjustment: Use MES buffer to stabilize the pH of the entire system at 5.8-6.2; S4.

2. Low-temperature concentration and drying: The material after pH adjustment in step S4.1 is placed in a spray drying tower for concentration and drying. The spray drying air inlet temperature is 180°C → the air outlet temperature is 85°C (to protect the activity of the functional additive); S4.

3. Anti-crystallization guarantee process: After adding sodium gluconate, start high-frequency oscillation (45~55Hz) and continue for 22~26 minutes. The finished product is frozen at -5℃ and is qualified if no crystals are precipitated.

6. The preparation process of the molybdenum-boron synergistic control type large-element water-soluble fertilizer according to claim 5, characterized in that, The frequency of ultrasonic dispersion in step S1.2 is controlled at 35-45 kHz and the time is 15-25 min. The pH value of the dropwise addition of polyglutamic acid and salicylic acid in step S3.2 needs to be controlled at 5.8-6.

2.

7. The preparation process of the molybdenum-boron synergistic control type large-element water-soluble fertilizer according to claim 5, characterized in that, The detection point for pH detection in step S4.1 is precisely at the outlet of the reactor and the finished product tank. In step S4.2, the moisture content of the dried material is controlled to be ≤2.0%.

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