A liquid fertilizer containing dextrose and its preparation method

Abstract

This invention discloses a liquid fertilizer containing dextrose and its preparation method, relating to the field of plant organic nutrient solution technology. By mass percentage, the liquid fertilizer comprises: 5%-15% dextrose, 8%-20% nitrogen source, 5%-12% phosphorus source, 10%-25% potassium source, 0.1%-2% trace elements, 0.5%-3% chelating agent, and the balance being deionized water. The trace elements are selected from at least three of iron, manganese, zinc, copper, boron, and molybdenum, and the chelating agent is disodium EDTA or citric acid. This invention solves the problems of poor trace element stability, low nutrient utilization rate, and limited functionality in existing liquid fertilizers by scientifically proportioning dextrose with nitrogen, phosphorus, potassium, macro-elements, trace elements, and chelating agents. It achieves full dissolution and uniform mixing of the fertilizer components, ensuring product quality stability. Furthermore, it not only provides crops with comprehensive and balanced nutrients but also enhances the crop's nutrient absorption capacity, strengthens crop resistance, improves the soil micro-ecological environment, and increases crop yield and quality.

Description

Technical Field

[0001] This invention relates to the field of plant organic nutrient solution technology, and in particular to a liquid fertilizer containing dextrose and its preparation method. Background Technology

[0002] Liquid fertilizers have become an important development direction for fertilization in modern agriculture due to their advantages such as rapid nutrient absorption, convenient application, high utilization rate, and compatibility with fertigation technology. Compared with traditional solid fertilizers, liquid fertilizers can effectively avoid problems such as nutrient fixation and volatilization loss, and can precisely proportion nutrients according to crop growth needs, meeting the production requirements of modern precision agriculture.

[0003] Currently, most liquid fertilizers on the market are mainly composed of nitrogen, phosphorus, potassium, and micronutrients. Some products add organic adjuvants such as humic acid and amino acids to improve fertilizer efficiency, but there are still some technical defects: micronutrients are prone to complexation reactions with ions in water to form precipitates, which reduces the effectiveness of micronutrients and results in poor crop absorption and utilization; inorganic nutrients in fertilizers have insufficient affinity with crop roots, and nutrients are easily lost in the soil and are difficult for crops to continuously absorb; existing liquid fertilizers lack components that can precisely regulate crop physiological metabolism, and cannot simultaneously achieve the dual effects of nutrient supplementation and crop stress resistance enhancement.

[0004] Dextran, a natural monosaccharide, is easily absorbed by crops, directly participates in crop carbohydrate metabolism, and can act as a chelating agent to enhance the stability of micronutrients. It also stimulates root growth and enhances the crop's ability to absorb nutrients. However, there is currently no technical solution for scientifically combining dextran with nitrogen, phosphorus, potassium, and micronutrients to prepare a high-efficiency liquid fertilizer. Existing research on the application of dextran in fertilizers is limited to exploring single components, lacking a systematic formulation system and standardized preparation process. This prevents the full realization of dextran's potential in improving fertilizer efficiency and crop growth.

[0005] Based on the shortcomings of the existing technologies, there is an urgent need to develop a liquid fertilizer with dextrose as the core functional component, scientifically proportioned nitrogen, phosphorus, potassium and trace elements, and standardized preparation process. This would solve the problems of low nutrient utilization, poor stability and single function of existing liquid fertilizers, and achieve multiple agricultural benefits such as precise nutrient supplementation, improved crop stress resistance and improved soil environment. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a liquid fertilizer containing dextrose and its preparation method. This invention solves the problems of poor micronutrient stability, low nutrient utilization rate and single function of existing liquid fertilizers by scientifically combining dextrose with nitrogen, phosphorus, potassium macro-elements, micro-elements and complexing agents. At the same time, through standardized preparation process, the full dissolution and uniform mixing of fertilizer components are achieved, ensuring the stability of product quality.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A liquid fertilizer containing dextrose, comprising, by mass percentage: 5%-15% dextrose, 8%-20% nitrogen source, 5%-12% phosphorus source, 10%-25% potassium source, 0.1%-2% trace elements, 0.5%-3% chelating agent, with the balance being deionized water; wherein the trace elements are selected from at least three of iron, manganese, zinc, copper, boron, and molybdenum, and the chelating agent is disodium EDTA or citric acid.

[0008] As a preferred embodiment of the present invention, the liquid fertilizer comprises, by mass percentage: 10% dextrose, 15% nitrogen source, 8% phosphorus source, 20% potassium source, 1% trace elements, 1.5% complexing agent, and the remainder being deionized water.

[0009] As a further preferred embodiment of the present invention, the dextrose is food-grade dextrose with a purity of ≥99% and a particle size of 100-200 mesh.

[0010] As a further preferred embodiment of the present invention, the liquid fertilizer has a pH value of 5.5-7.0 and a density of 1.10-1.25 g / cm³.

[0011] As a further preferred embodiment of the present invention, the liquid fertilizer further includes 0.1%-0.5% of a preservative, wherein the preservative is selected from potassium sorbate and sodium benzoate.

[0012] As a further preferred embodiment of the present invention, the trace elements are a combination of iron, manganese, zinc, copper, boron, and molybdenum, and the content of each trace element by mass percentage is: iron 0.05%-0.5%, manganese 0.05%-0.4%, zinc 0.05%-0.4%, copper 0.02%-0.2%, boron 0.02%-0.3%, and molybdenum 0.01%-0.1%.

[0013] This invention also provides a method for preparing the above-mentioned liquid fertilizer containing dextrose, comprising the following steps: S1: Take the prescribed amount of deionized water and place it in a reaction vessel. Control the temperature inside the reaction vessel to 30-45℃ and the stirring speed to 150-250r / min. During the stirring process, an inert gas is introduced for protection. The inert gas is nitrogen or argon.

[0014] S2: Add the formulated amount of complexing agent and trace elements to the reaction vessel in sequence, stir for 15-30 minutes until completely dissolved, and obtain mixture A.

[0015] S3: Add the prescribed amounts of nitrogen, phosphorus, and potassium sources to mixture A, and continue stirring for 30-60 minutes, keeping the stirring speed constant, until all components are completely dissolved to obtain mixture B.

[0016] S4: Add the prescribed amount of dextrose to mixture B and stir for 20-40 minutes to ensure that the dextrose is completely dissolved and there are no residual particles.

[0017] S5: If preservatives need to be added, add the prescribed amount of preservatives to the solution obtained in step S4, stir for 10-15 minutes, and mix evenly.

[0018] S6: Adjust the pH of the solution to 5.5-7.0, continue stirring for 10-20 minutes, then let it stand and filter to remove impurities, obtaining a liquid fertilizer containing dextrose. The pH is adjusted using citric acid or sodium hydroxide solution, added slowly with continuous stirring to ensure a uniform and stable pH. Filtration uses a precision filter membrane with a filtration accuracy of 0.22-0.45 μm and a filtration pressure controlled at 0.1-0.3 MPa.

[0019] S7: Fill and seal the filtered liquid fertilizer and store it in a cool, dry place.

[0020] In step S1, the temperature inside the reactor is controlled at 30-45℃. This temperature range can improve the dissolution rate of each component, while avoiding the problems of excessively high temperature causing some nutrients to be oxidized and ineffective, and excessively low temperature causing the dissolution rate to be too slow. A stirring speed of 150-250 r / min can ensure uniform flow of water, providing good kinetic conditions for the dissolution of subsequent components. Introducing inert gases such as nitrogen or argon can isolate oxygen in the reactor, preventing easily oxidized components such as trace elements and dextrose from being oxidized during the dissolution process, thus ensuring the effectiveness of nutrients.

[0021] In step S2, adding the complexing agent first and then the trace elements allows the complexing agent and trace elements to fully complex, forming stable complexed trace elements. This prevents the trace elements from reacting with other ions in the water to form precipitates, thus improving the stability of the trace elements and the crop's absorption and utilization rate. The stirring time of 15-30 minutes ensures that the complexing agent and trace elements react and dissolve fully, ensuring that there are no undissolved solid particles in the mixture A.

[0022] In step S3, nitrogen, phosphorus, and potassium sources are added to the complexed trace elements to avoid adverse reactions between macro-elements and trace elements and to ensure the full dissolution of each macro-element. The stirring time of 30-60 minutes allows the macro-elements to be fully mixed with the mixture A, achieving uniform distribution of nutrients, while ensuring the complete dissolution of each inorganic salt nutrient and avoiding problems such as crystallization and precipitation.

[0023] In step S4, dextrose is added after the macro-elements have been dissolved. This avoids competition between dextrose and inorganic salt nutrients during the dissolution process, ensuring that dextrose is fully dissolved. The stirring time of 20-40 minutes allows dextrose to be fully mixed with the mixture B, so that dextrose is evenly dispersed in the fertilizer system, giving full play to its role as a chelating agent, nutrient supplement, and physiological regulator.

[0024] In step S5, the preservative is added after the dextrose has dissolved, which can prevent the preservative from reacting with other components and becoming ineffective. The stirring time of 10-15 minutes can ensure the uniform distribution of the preservative in the fertilizer system and achieve a good preservative effect.

[0025] In step S6, citric acid or sodium hydroxide solution is used to adjust the pH value. Both of these agents are safe and commonly used in agricultural production, and will not pollute crops or soil. Slow addition and continuous stirring can avoid component precipitation and stratification caused by sudden changes in local pH value, ensuring the uniformity and stability of the pH value of the fertilizer system. A precision filter membrane of 0.22-0.45μm can effectively remove tiny impurities, undissolved microparticles and microorganisms from the solution. A filtration pressure of 0.1-0.3MPa can ensure filtration efficiency and effect, avoiding problems such as membrane damage due to excessive filtration pressure and incomplete filtration due to insufficient pressure, further improving the purity and stability of the fertilizer product.

[0026] In step S7, storing the fertilizer in a cool, dry place can prevent problems such as nutrient decomposition, microbial growth, and product deterioration caused by factors such as light, high temperature, and humidity, thus ensuring the storage stability of the product. In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, by scientifically combining dextrose with macro- and micro-elements such as nitrogen, phosphorus, and potassium, dextrose can be directly absorbed and utilized by crops, participating in the carbohydrate metabolism of crops and providing energy for crop growth. At the same time, as a natural chelating agent, dextrose can work synergistically with complexing agents to further enhance the stability of micro-elements and prevent them from being fixed or precipitated in the soil. In addition, dextrose can stimulate the growth of crop roots, promote the development of crop root hairs, increase the absorption area of ​​crop roots, and improve the overall fertilizer efficiency.

[0027] 2. The liquid fertilizer of the present invention can not only provide crops with comprehensive macro- and micro-nutrients to solve the problem of crop nutrient deficiency, but also enhance the crop's stress resistance through the physiological regulation of dextrose. Dextrose can increase the osmotic pressure of crop cells and enhance the crop's drought and cold resistance; at the same time, it can promote the synthesis of antioxidant enzymes in the crop and enhance the crop's resistance to diseases, pests and diseases and salt and alkali.

[0028] 3. The liquid fertilizer of the present invention has a pH value of weakly acidic to neutral, which will not cause soil acidification or alkalization. On the contrary, it can improve the soil compaction and acid-base imbalance caused by long-term application of chemical fertilizers, enhance the soil's water and fertilizer retention capacity, and improve the soil micro-ecological environment.

[0029] 4. The liquid fertilizer of this invention has a high nutrient utilization rate, effectively reducing the amount of fertilizer applied, lowering fertilizer costs in agricultural production, and reducing agricultural non-point source pollution caused by fertilizer runoff, thus being environmentally friendly. After applying the fertilizer of this invention, the quality of crops is significantly improved, with a marked increase in indicators such as sugar content and vitamin content of fruits, and there is no problem of excessive pesticide or fertilizer residues, meeting the production requirements of green food and organic food. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All equivalent substitutions or modifications made based on the concept of this invention should be included within the scope of protection of this invention.

[0031] It should be noted that the raw materials used in the following examples are all commercially available conventional raw materials. Among them, the dextrose is food grade with a purity of ≥99% and a particle size of 100-200 mesh; the conductivity of the deionized water is ≤10μS / cm; and the precision filter membrane is made of polytetrafluoroethylene with a filtration accuracy of 0.22-0.45μm.

[0032] Example 1: A liquid fertilizer containing dextrose, by mass percentage, comprises: 5% dextrose, 10% urea, 8% potassium dihydrogen phosphate, 10% potassium chloride, 0.1% trace elements, 0.5% disodium EDTA, 0.1% potassium sorbate, and the balance being deionized water.

[0033] The trace elements, by mass percentage, are: iron 0.05%, manganese 0.03%, zinc 0.02%, and the remainder is deionized water.

[0034] The preparation method of the above-mentioned liquid fertilizer includes the following steps: S1: Take the prescribed amount of deionized water and place it in a reaction vessel. Control the temperature inside the reaction vessel to 30℃ and the stirring speed to 150r / min. At the same time, introduce nitrogen gas for inert gas protection.

[0035] S2: Add the prescribed amounts of disodium EDTA, iron, manganese, and zinc to the reactor in sequence, stir for 15 minutes until completely dissolved, and obtain mixture A.

[0036] S3: Add the prescribed amounts of urea, potassium dihydrogen phosphate, and potassium chloride to mixture A, and continue stirring for 30 minutes at a stirring speed of 150 r / min until all components are completely dissolved to obtain mixture B.

[0037] S4: Add the prescribed amount of dextrose to mixture B, stir for 20 minutes to ensure that the dextrose is completely dissolved and there are no residual particles.

[0038] S5: Add the prescribed amount of potassium sorbate to the solution obtained in step S4, stir for 10 minutes, and mix thoroughly.

[0039] S6: Citric acid solution is slowly added dropwise to the above solution to adjust the pH value to 5.5. Stirring is carried out continuously during the adjustment process, and stirring is continued for 10 minutes after the adjustment is completed. Then, a precision filter membrane with a filtration accuracy of 0.22μm is used to perform static filtration at a filtration pressure of 0.1MPa to remove impurities and obtain liquid fertilizer containing dextrose.

[0040] S7: Fill and seal the filtered liquid fertilizer in plastic buckets and store it in a cool, dry place.

[0041] The liquid fertilizer prepared in this embodiment has a density of 1.10 g / cm³, is a homogeneous and transparent liquid, without sedimentation or stratification, and remains homogeneous after 18 months of storage at room temperature, with no significant decrease in the content of each nutrient.

[0042] Example 2: A liquid fertilizer containing dextrose comprises, by mass percentage: 15% dextrose, 8% ammonium nitrate, 12% monoammonium phosphate, 25% potassium sulfate, 2% trace elements, 3% citric acid, 0.5% sodium benzoate, with the remainder being deionized water.

[0043] The trace elements, by mass percentage, are: iron 0.5%, manganese 0.4%, zinc 0.4%, copper 0.2%, boron 0.3%, molybdenum 0.1%, with the remainder being deionized water.

[0044] The preparation method of the above-mentioned liquid fertilizer includes the following steps: S1: Take the prescribed amount of deionized water and place it in a reaction vessel. Control the temperature inside the reaction vessel to 45℃ and the stirring speed to 250r / min. At the same time, argon gas is introduced for inert gas protection.

[0045] S2: Add the prescribed amounts of citric acid, iron, manganese, zinc, copper, boron, and molybdenum to the reactor in sequence, stir for 30 minutes until completely dissolved, and obtain mixture A.

[0046] S3: Add the prescribed amounts of ammonium nitrate, monoammonium phosphate, and potassium sulfate to mixture A, and continue stirring for 60 minutes at a stirring speed of 250 r / min until all components are completely dissolved to obtain mixture B.

[0047] S4: Add the prescribed amount of dextrose to mixture B and stir for 40 minutes to ensure that the dextrose is completely dissolved and there are no residual particles.

[0048] S5: Add the prescribed amount of sodium benzoate to the solution obtained in step S4, stir for 15 minutes, and mix thoroughly.

[0049] S6: Sodium hydroxide solution was slowly added dropwise to the above solution to adjust the pH value to 7.0. During the adjustment process, the mixture was stirred continuously. After the adjustment was completed, the mixture was stirred for another 20 minutes. Then, a precision filter membrane with a filtration accuracy of 0.45 μm was used to perform static filtration at a filtration pressure of 0.3 MPa to remove impurities and obtain liquid fertilizer containing dextrose.

[0050] S7: Fill and seal the filtered liquid fertilizer in plastic buckets and store it in a cool, dry place.

[0051] The liquid fertilizer prepared in this embodiment has a density of 1.25 g / cm³, is a homogeneous and transparent liquid, without sedimentation or stratification, and remains homogeneous after 18 months of storage at room temperature, with no significant decrease in the content of each nutrient.

[0052] Example 3: A liquid fertilizer containing dextrose, by mass percentage, comprises: 8% dextrose, 12% amino acids, 7% polyphosphoric acid, 15% potassium nitrate, 0.5% trace elements, 1% disodium EDTA, 0.2% potassium sorbate, and the balance being deionized water.

[0053] The trace elements, by mass percentage, are: iron 0.1%, manganese 0.1%, zinc 0.1%, copper 0.05%, boron 0.05%, molybdenum 0.02%, with the remainder being deionized water; the amino acids are a mixture of glycine, glutamic acid, and aspartic acid in a mass ratio of 1:1:1.

[0054] The preparation method of the above-mentioned liquid fertilizer includes the following steps: S1: Take the prescribed amount of deionized water and place it in a reaction vessel. Control the temperature inside the reaction vessel to 35℃ and the stirring speed to 200r / min. At the same time, introduce nitrogen gas for inert gas protection.

[0055] S2: Add the prescribed amounts of disodium EDTA, iron, manganese, zinc, copper, boron, and molybdenum to the reactor in sequence, stir for 20 minutes until completely dissolved, and obtain mixture A.

[0056] S3: Add the prescribed amounts of amino acids, polyphosphoric acid, and potassium nitrate to mixture A, and continue stirring for 40 minutes at a stirring speed of 200 r / min until all components are completely dissolved to obtain mixture B.

[0057] S4: Add the prescribed amount of dextrose to mixture B and stir for 25 minutes to ensure that the dextrose is completely dissolved and there are no residual particles.

[0058] S5: Add the prescribed amount of potassium sorbate to the solution obtained in step S4, stir for 12 minutes, and mix thoroughly.

[0059] S6: Citric acid solution is slowly added dropwise to the above solution to adjust the pH value to 6.0. Stirring is carried out continuously during the adjustment process, and stirring is continued for 15 minutes after the adjustment is completed. Then, a precision filter membrane with a filtration accuracy of 0.3μm is used to perform static filtration at a filtration pressure of 0.2MPa to remove impurities and obtain liquid fertilizer containing dextrose.

[0060] S7: Fill and seal the filtered liquid fertilizer in plastic buckets and store it in a cool, dry place.

[0061] The liquid fertilizer prepared in this embodiment has a density of 1.15 g / cm³, is a homogeneous and transparent liquid, without sedimentation or stratification, and remains homogeneous after 18 months of storage at room temperature, with no significant decrease in the content of each nutrient.

[0062] Example 4: A liquid fertilizer containing dextrose, by mass percentage, comprises: 12% dextrose, 5% urea, 13% ammonium nitrate, 10% potassium dihydrogen phosphate, 12% potassium sulfate, 1.5% trace elements, 2% citric acid, 0.4% sodium benzoate, and the balance being deionized water.

[0063] The trace elements, by mass percentage, are: iron 0.3%, manganese 0.2%, zinc 0.2%, copper 0.1%, boron 0.2%, molybdenum 0.05%, with the remainder being deionized water.

[0064] The preparation method of the above-mentioned liquid fertilizer includes the following steps: S1: Take the prescribed amount of deionized water and place it in a reaction vessel. Control the temperature inside the reaction vessel to 40℃ and the stirring speed to 220r / min. At the same time, argon gas is introduced for inert gas protection.

[0065] S2: Add the prescribed amounts of citric acid, iron, manganese, zinc, copper, boron, and molybdenum to the reaction vessel in sequence, stir for 25 minutes until completely dissolved, and obtain mixture A.

[0066] S3: Add the prescribed amounts of urea, ammonium nitrate, potassium dihydrogen phosphate, and potassium sulfate to mixture A, and continue stirring for 50 minutes at a stirring speed of 220 r / min until all components are completely dissolved to obtain mixture B.

[0067] S4: Add the prescribed amount of dextrose to mixture B and stir for 35 minutes to ensure that the dextrose is completely dissolved and there are no residual particles.

[0068] S5: Add the prescribed amount of sodium benzoate to the solution obtained in step S4, stir for 13 minutes, and mix thoroughly.

[0069] S6: Sodium hydroxide solution was slowly added dropwise to the above solution to adjust the pH value to 6.5. During the adjustment process, the mixture was stirred continuously. After the adjustment was completed, the mixture was stirred for another 18 minutes. Then, a precision filter membrane with a filtration accuracy of 0.4 μm was used to perform static filtration at a filtration pressure of 0.25 MPa to remove impurities and obtain liquid fertilizer containing dextrose.

[0070] S7: Fill and seal the filtered liquid fertilizer in plastic buckets and store it in a cool, dry place.

[0071] The liquid fertilizer prepared in this embodiment has a density of 1.20 g / cm³, is a homogeneous and transparent liquid, without sedimentation or stratification, and remains homogeneous after 18 months of storage at room temperature, with no significant decrease in the content of each nutrient.

[0072] Example 5: A liquid fertilizer containing dextrose, by mass percentage, comprises: 10% dextrose, 15% amino acids, 8% monoammonium phosphate, 20% potassium nitrate, 1.0% trace elements, 1.5% disodium EDTA, 0.3% potassium sorbate, and the balance being deionized water.

[0073] The trace elements, by mass percentage, are: iron 0.2%, manganese 0.15%, zinc 0.15%, copper 0.08%, boron 0.12%, molybdenum 0.03%, with the remainder being deionized water; the amino acids are complex amino acids containing 18 essential amino acids for the human body, extracted from agricultural-grade food processing by-products.

[0074] The preparation method of the above-mentioned liquid fertilizer includes the following steps: S1: Take the prescribed amount of deionized water and place it in a reaction vessel. Control the temperature inside the reaction vessel to 38℃ and the stirring speed to 180r / min. At the same time, introduce nitrogen gas for inert gas protection.

[0075] S2: Add the prescribed amounts of disodium EDTA, iron, manganese, zinc, copper, boron, and molybdenum to the reactor in sequence, stir for 22 minutes until completely dissolved, and obtain mixture A.

[0076] S3: Add the formulated amounts of compound amino acids, monoammonium phosphate, and potassium nitrate to mixture A, and continue stirring for 45 minutes at a stirring speed of 180 r / min until all components are completely dissolved to obtain mixture B.

[0077] S4: Add the prescribed amount of dextrose to mixture B, stir for 30 minutes to ensure that the dextrose is completely dissolved and there are no residual particles.

[0078] S5: Add the prescribed amount of potassium sorbate to the solution obtained in step S4, stir for 11 minutes, and mix thoroughly.

[0079] S6: The pH of the above solution was adjusted to 6.2 by mixing citric acid and sodium hydroxide solution. During the adjustment process, the solution was added slowly and stirred continuously. After the adjustment was completed, the solution was stirred for another 16 minutes. Then, a precision filter membrane with a filtration accuracy of 0.35 μm was used to perform static filtration at a filtration pressure of 0.22 MPa to remove impurities and obtain liquid fertilizer containing dextrose.

[0080] S7: Fill and seal the filtered liquid fertilizer in plastic buckets and store it in a cool, dry place.

[0081] This embodiment is the optimal embodiment. The prepared liquid fertilizer has a density of 1.18 g / cm³, is a homogeneous and transparent liquid, without sedimentation or stratification, and exhibits the best synergistic effect among its components, resulting in the most significant fertilizer effect. After 18 months of storage at room temperature, the nutrient retention rate reaches over 98%, and the product quality stability is optimal.

[0082] Performance testing To verify the practical application effect of the liquid fertilizer of the present invention, the liquid fertilizer prepared in Example 5 was selected as the experimental group, and a commercially available conventional water-soluble liquid fertilizer (without dextran component and nitrogen, phosphorus and potassium content equivalent to that in Example 5) was selected as the control group. Field comparison experiments were conducted on three crops: wheat, cucumber and apple. Three replicate plots were set up for each crop, with a plot area of ​​20㎡. Other field management measures were kept consistent during the experiment.

[0083] Experiment 1: Wheat Field Trial The experimental crop was winter wheat, variety Jimai 44. Fertilizer was sprayed on the leaves once each during the wheat jointing and flowering stages, with a dilution ratio of 500 times. The control group was sprayed with the same concentration of commercially available conventional liquid fertilizer, and the blank group was sprayed with the same amount of deionized water.

[0084] After harvest, the number of effective spikes, number of grains per spike, thousand-grain weight, and yield of wheat were recorded. At the same time, the protein content and gluten content of wheat grains were measured. The results are shown in Table 1.

[0085] Table 1 Results of wheat field trials:

[0086] As shown in Table 1, after applying the liquid fertilizer of the present invention, the number of effective spikes, number of grains per spike, and thousand-grain weight of wheat were significantly increased, and the yield was increased by 13.35% compared with the control group. In addition, the quality indicators such as protein content and gluten content of wheat grains were also significantly improved, indicating that the liquid fertilizer of the present invention can significantly improve the yield and quality of wheat.

[0087] Experiment 2: Cucumber Field Trial The experimental crop was cucumber, variety Jinyan No. 4, grown in a greenhouse. The experiment began 7 days after the cucumbers were transplanted. Fertilizer was applied every 10 days with a dilution ratio of 300 times, for a total of 5 applications. The control group was treated with the same concentration of commercially available liquid fertilizer, while the blank group was treated with the same amount of deionized water.

[0088] The number of fruits per cucumber plant, the weight of a single fruit, the harvest time, and the total yield were statistically analyzed. At the same time, the vitamin C content and soluble sugar content of cucumber fruits were measured. The results are shown in Table 2.

[0089] Table 2 Results of cucumber field trials:

[0090] As shown in Table 2, after applying the liquid fertilizer of the present invention, the number of fruits per cucumber plant and the weight of a single fruit were significantly increased, the harvest period was extended by 8 days, and the total yield was increased by 22.88% compared with the control group. Moreover, the quality indicators of cucumber fruits, such as vitamin C content and soluble sugar content, were greatly improved. This indicates that the liquid fertilizer of the present invention can significantly improve the fruiting ability of cucumbers, extend the harvest period, and greatly improve the yield and quality of cucumbers.

[0091] Experiment 3: Apple Field Trial The experimental crop was apple, the variety was Red Fuji, and the tree age was 8 years. Fertilizer was sprayed on the leaves once each during the apple budding period, flowering period, and fruit expansion period, with a dilution ratio of 800 times. The control group was sprayed with the same concentration of commercially available conventional liquid fertilizer, and the blank group was sprayed with the same amount of deionized water.

[0092] The number of fruits per tree, the weight of a single fruit, the coloring rate, and the yield of apples were statistically analyzed. At the same time, the soluble solids content and titratable acid content of the apple fruits were measured. The results are shown in Table 3.

[0093] Table 3 Results of apple field trials:

[0094] As shown in Table 3, after applying the liquid fertilizer of the present invention, the number of fruits per tree, the weight of a single fruit, and the coloring rate of apples were significantly increased, and the yield was increased by 24.89% compared with the control group. Moreover, the soluble solids content of apple fruits was significantly increased, the titratable acid content was significantly reduced, the sugar-acid ratio of the fruits was better, and the quality was greatly improved. This indicates that the liquid fertilizer of the present invention can significantly improve the fruit setting rate and coloring rate of apples, and improve the yield and quality of apples.

[0095] Experiment 4: Stress Resistance Test Maize seedlings of the Zhengdan 958 variety were selected as experimental materials. The seedlings were cultivated to the 3-leaf-1-heart stage and divided into a blank group, a control group, and an experimental group, with 30 seedlings in each group. The experimental group was irrigated with the liquid fertilizer diluted 1000 times prepared in Example 5, the control group was irrigated with commercially available liquid fertilizer diluted 1000 times, and the blank group was irrigated with an equal amount of deionized water. Irrigation was carried out for 3 consecutive days, and then drought stress treatment was carried out (irrigation was stopped). The wilting of the maize seedlings was observed, and the survival rate after 10 days of drought stress was counted. The results are shown in Table 4.

[0096] Table 4 Results of drought resistance test on maize seedlings:

[0097] As shown in Table 4, after applying the liquid fertilizer of the present invention, the wilting time of corn seedlings was significantly delayed, the rate of severe wilting was greatly reduced, and the survival rate after drought stress was increased by 78.37% compared with the control group, indicating that the liquid fertilizer of the present invention can significantly improve the drought resistance and stress resistance of crops.

[0098] Application methods The liquid fertilizer containing dextrose of this invention can be diluted with different ratios and applied at different frequencies depending on the crop type, growth cycle, and fertilization method. Specific application methods are as follows: Foliar spraying: Suitable for seedling, growth, flowering and fruit expansion stages of various crops. The dilution ratio is 500-1000 times. Spray once every 7-15 days, for 2-3 consecutive times. When spraying, spray evenly on both sides of the crop leaves, making sure the leaves are moist but not dripping. Choose to spray on cloudy days or in the morning or evening of sunny days, and avoid spraying under high temperature and strong light.

[0099] Fertigation: Suitable for vegetables, fruits, and cash crops grown in open fields and greenhouses. The dilution ratio is 200-500 times. Fertigation should be carried out after crop transplanting, during the growth period, and during the fruit expansion period, once every 10-20 days. The amount of fertilizer applied each time is 20-30 kg / 667㎡. Fertigation should be carried out in conjunction with watering to ensure that the fertilizer is evenly penetrated around the crop roots.

[0100] Drip irrigation: Suitable for integrated water and fertilizer planting mode, the dilution ratio is 500-1000 times. The fertilizer is delivered to the crop roots with the water through the drip irrigation system. The fertilization time is 1-2 hours, and drip irrigation is carried out once every 7-10 days. The amount of fertilizer used each time is 5-10 kg / 667㎡. After drip irrigation, rinse the drip irrigation pipe with clean water to prevent pipe blockage.

[0101] Root irrigation: Suitable for crop seedling raising, transplanting and recovery after root damage. The dilution ratio is 300-500 times, and the amount of fertilizer per plant is 200-500 ml. Adjust the amount according to the size of the crop plant. When irrigating the roots, pour the fertilizer solution evenly into the soil around the crop roots.

[0102] The liquid fertilizer containing dextrose of the present invention achieves the effects of nutrient supplementation and crop growth regulation after application through the following working principle: Rapid absorption and utilization of nutrients: Nitrogen, phosphorus, potassium, and complexed micronutrients in fertilizers are all water-soluble nutrients that can be rapidly absorbed by the roots and leaves of crops and directly participate in the physiological metabolic processes of crops; Dextran, as a monosaccharide, can be rapidly absorbed by crops, providing energy for physiological processes such as photosynthesis and respiration, while also promoting the absorption and transport of other nutrients by crops, thus achieving rapid utilization of nutrients.

[0103] Stable chelation and release of trace elements: Complexing agents such as disodium EDTA or citric acid form stable complexed compounds with trace elements, preventing them from reacting with phosphate and carbonate ions in the soil to form precipitates. Simultaneously, the complexed trace elements are slowly released around the crop roots, ensuring continuous absorption by the crop and preventing nutrient deficiencies. Dextrose can synergistically work with complexing agents to further enhance the stability of the complexed trace elements and prolong their effective release time.

[0104] Stimulation of root growth and enhancement of absorption capacity: Dextran can stimulate the synthesis of endogenous hormones such as auxin and cytokinin in crop roots, promote the development of root hairs and root elongation, and increase the absorption area of ​​crop roots; at the same time, dextran can improve the soil microenvironment around crop roots, promote the growth and reproduction of beneficial soil microorganisms, enhance the soil's water and fertilizer retention capacity, and further enhance the crop roots' ability to absorb nutrients and water.

[0105] Enhancing crop stress resistance: Dextran can increase the osmotic pressure of crop cells, enabling them to retain moisture under adverse conditions such as drought and low temperature, preventing cell wilting due to water loss. At the same time, dextran can promote the synthesis of antioxidant enzymes such as superoxide dismutase (SOD) and peroxidase (POD) in crops, clearing reactive oxygen species and reducing oxidative damage to crop cells under adverse conditions. If amino acid-based nitrogen sources are selected in fertilizers, amino acids can work synergistically with dextran to further enhance the crop's resistance to diseases and pests, as well as its salt and alkali tolerance, thereby strengthening the overall stress resistance of crops.

[0106] Improvement of the soil environment: The liquid fertilizer of this invention has a pH value of weakly acidic to neutral. After application, it will not cause soil acidification or alkalization. On the contrary, it can neutralize the soil pH and improve the soil compaction problem caused by long-term application of chemical fertilizers. The organic components such as dextrose and amino acids in the fertilizer can provide carbon and nitrogen sources for beneficial soil microorganisms, promote the growth and reproduction of beneficial soil microorganisms, enhance soil microbial activity, improve soil aggregate structure, enhance soil water and fertilizer retention capacity, and realize the sustainable use of soil.

[0107] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A liquid fertilizer containing dextrose, characterized in that, The liquid fertilizer comprises, by mass percentage: 5%-15% dextrose, 8%-20% nitrogen source, 5%-12% phosphorus source, 10%-25% potassium source, 0.1%-2% trace elements, 0.5%-3% chelating agent, and the balance being deionized water; the trace elements are selected from at least three of iron, manganese, zinc, copper, boron, and molybdenum, and the chelating agent is disodium EDTA or citric acid.

2. The liquid fertilizer containing dextrose according to claim 1, characterized in that, The composition by mass percentage is as follows: 10% dextrose, 15% nitrogen source, 8% phosphorus source, 20% potassium source, 1% trace elements, 1.5% complexing agent, and the balance being deionized water.

3. The liquid fertilizer containing dextrose according to claim 2, characterized in that, The nitrogen source is selected from at least one of urea, ammonium nitrate, and amino acids; the phosphorus source is selected from at least one of potassium dihydrogen phosphate, monoammonium phosphate, and polyphosphoric acid; and the potassium source is selected from at least one of potassium chloride, potassium sulfate, and potassium nitrate.

4. A liquid fertilizer containing dextrose according to claim 2, characterized in that, The dextrose is food-grade dextrose with a purity of ≥99% and a particle size of 100-200 mesh.

5. The liquid fertilizer containing dextrose according to claim 2, characterized in that, The liquid fertilizer has a pH value of 5.5-7.0 and a density of 1.10-1.25 g / cm³.

6. A liquid fertilizer containing dextrose according to claim 2, characterized in that, It also includes 0.1%-0.5% of a preservative, which is selected from potassium sorbate and sodium benzoate.

7. A method for preparing a liquid fertilizer containing dextrose as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Take the amount of deionized water specified in the formula and place it in the reaction vessel. Control the temperature inside the reaction vessel to be 30-45℃ and the stirring speed to be 150-250r / min. S2: Add the complexing agent and trace elements in the formula to the reaction vessel in sequence, stir for 15-30 minutes until completely dissolved, and obtain mixture A; S3: Add the formulated amounts of nitrogen, phosphorus, and potassium sources to mixture A, and continue stirring for 30-60 minutes, keeping the stirring speed constant, until all components are completely dissolved to obtain mixture B. S4: Add the prescribed amount of dextrose to mixture B and stir for 20-40 minutes to ensure that the dextrose is completely dissolved and there are no residual particles. S5: If preservatives need to be added, add the prescribed amount of preservatives to the solution obtained in step S4, stir for 10-15 minutes, and mix evenly. S6: Adjust the pH of the solution to 5.5-7.0, continue stirring for 10-20 minutes, then let it stand and filter to remove impurities, and obtain liquid fertilizer containing dextrose; S7: Fill and seal the filtered liquid fertilizer and store it in a cool, dry place.

8. The method for preparing a liquid fertilizer containing dextrose according to claim 7, characterized in that, In step S1, an inert gas is introduced for protection during the stirring process. The inert gas is nitrogen or argon.

9. The method for preparing a liquid fertilizer containing dextrose according to claim 7, characterized in that, In step S6, citric acid or sodium hydroxide solution is used to adjust the pH value. The solution is added slowly with continuous stirring to ensure that the pH value is uniform and stable.

10. The method for preparing a liquid fertilizer containing dextrose according to claim 7, characterized in that, In step S6, a precision filter membrane is used for filtration with a filtration accuracy of 0.22-0.45μm and the filtration pressure is controlled at 0.1-0.3MPa to ensure the removal of minute impurities and insoluble substances from the solution.

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