High-stable anti-reverse multifunctional plant leaf conditioner and preparation method thereof

Abstract

The application discloses a high-stability anti-reverse multifunctional plant leaf conditioner and a preparation method thereof, and relates to the technical field of plant leaf nutrition regulation and green agricultural products. The high-stability anti-reverse multifunctional plant leaf conditioner is prepared from potassium dihydrogen phosphate, potassium nitrate, urea, calcium-magnesium chelate of xylitol, EDTA stable composite trace elements, polyglutamic acid, amino oligosaccharide and deionized water in specific proportions, wherein the mass ratio of calcium to magnesium is 2:1, the mass ratio of zinc, iron, boron, manganese and copper is 3:2:2:1:1, the molecular weight of polyglutamic acid is 9000-11000 Da, the deacetylation degree of amino oligosaccharide is not less than 90%, and the polymerization degree is 2-8. The preparation is carried out in the following steps: base stable dissolution, macroelement gradient dissolution, micro-and trace component composite stabilization, biological active component low-speed compounding and maturation filtration, so that the clear and uniform liquid leaf conditioner is obtained. The application is beneficial to reducing nutrient antagonism and precipitation, improving leaf absorption, nutrient slow release and crop adversity repair capacity.

Description

Technical Field

[0001] This invention relates to the field of plant foliar nutrition regulation and green agricultural input technology, specifically to a highly stable and stress-resistant multifunctional plant foliar conditioner and its preparation method. Background Technology

[0002] Foliar nutrient conditioners are absorbed and utilized through the surface of crop leaves, tender shoots, and young fruits. They are characterized by rapid effects, high nutrient utilization rates, and minimal impact from soil compaction or salinization. They are important inputs in modern agricultural production used to alleviate nutrient deficiency symptoms, promote growth, and improve product quality.

[0003] Most existing foliar conditioning products are simple blends of macronutrients such as nitrogen, phosphorus, and potassium, resulting in a high degree of product homogeneity. When conventional inorganic salt systems are mixed with calcium, magnesium, and various trace elements, problems such as ion antagonism, insufficient complexation, or precipitation can easily occur, leading to a reduction in effective nutrients and potentially causing nozzle clogging, increased leaf residue, or localized pesticide damage.

[0004] While some foliar products containing biostimulants or antagonistic components incorporate polyglutamic acid, chitosan oligosaccharides, amino acids, or humic acids, the common formulations are often simple physical mixtures without synergistic limitations on the forms of micronutrients, the molecular weight of polyglutamic acid, the degree of polymerization of amino oligosaccharides, and the low-shear compounding process. These products may experience flocculation, stratification, reduced activity, or insufficient batch stability during storage, affecting their industrial application. Summary of the Invention

[0005] The purpose of this invention is to provide a highly stable and stress-resistant multifunctional plant foliar conditioner and its preparation method, which solves the problems of nutrient antagonism, insufficient system stability, easy inactivation of bioactive components, and weak functional synergy in existing foliar conditioner products.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A highly stable and stress-resistant multifunctional plant foliar conditioner is prepared from the following raw materials in parts by weight: 18-22 parts potassium dihydrogen phosphate, 12-18 parts potassium nitrate, 10-14 parts urea, 7-10 parts sugar alcohol calcium magnesium, 4-6 parts chelated trace elements, 1.5-2.5 parts polyglutamic acid, 0.8-1.5 parts amino oligosaccharide, and 45-55 parts deionized water; wherein, the sugar alcohol calcium magnesium is a xylitol chelated calcium magnesium composite preparation, with a calcium to magnesium mass ratio of 2:1; the chelated trace elements are an EDTA-stabilized composite trace element containing EDTA-chelated zinc, EDTA-chelated iron, EDTA-chelated boron, EDTA-chelated manganese, and EDTA-chelated copper, with a zinc:iron:boron:manganese:copper ratio of 3:2:2:1:1. By employing an EDTA-stabilized composite system, adverse reactions between trace elements and phosphate, calcium, and magnesium ions are reduced, improving the stability of multi-element coexistence.

[0007] Furthermore, the polyglutamic acid is anionic water-soluble polyglutamic acid with a molecular weight of 9000-11000 Da. This molecular weight range is beneficial for balancing complexation and solubility, leaf surface adhesion, nutrient slow release, and system fluidity. When the molecular weight is too low, the slow release and complexation effects are insufficient, while when the molecular weight is too high, it is easy to increase the viscosity of the system and bring about the risk of flocculation.

[0008] Furthermore, the amino oligosaccharide is a chitosan-degraded oligoamino oligosaccharide with a degree of deacetylation of not less than 90% and a degree of polymerization of 2 to 8. This amino oligosaccharide can be used as an auxiliary component for plant immune induction and stress repair. When combined with polyglutamic acid, it is beneficial to improve leaf adhesion, induce stress resistance, and enhance nutrient utilization.

[0009] Furthermore, the present invention also provides a method for preparing the above-mentioned highly stable and stress-resistant multifunctional plant foliar conditioner, comprising the following steps: S1. Take deionized water according to the ratio, stir at 250-350 r / min for 3-8 min at room temperature to obtain a homogeneous base solvent; S2. Urea, potassium nitrate and potassium dihydrogen phosphate are slowly added in batches to the homogeneous base solvent, and stirred at 300-400 r / min for 15-25 min to obtain a macro-element stable solution. S3. Add xylitol-chelated calcium-magnesium complex preparation and EDTA-stabilized complex trace elements to the macro-element stable solution, and stir at 400-500 r / min for 8-15 min to obtain a medium-trace component complex solution. S4. Adjust the stirring speed to 200-300 r / min, add polyglutamic acid and amino oligosaccharide to the micro-component composite solution, stir for 8-15 min, and obtain the composite conditioning solution. S5. After the compound conditioning liquid is left to stand at room temperature for 25-45 minutes, it is filtered using a 100-150 mesh filter to obtain a high-stability, stress-resistant, multifunctional plant foliar conditioner.

[0010] The beneficial effects of this invention are as follows: This application improves the stability of multi-element coexistence by synergistically combining macro-elements, xylitol-chelated calcium and magnesium, and EDTA-stabilized micro-elements; by limiting the molecular weight of polyglutamic acid and the specifications of amino oligosaccharides, it is beneficial to balance nutrient slow release, foliar adhesion, and plant resistance induction; by adding bioactive components through stepwise dissolution and low-speed, low-shear dissolution, it is beneficial to reduce flocculation, precipitation, and activity loss; this conditioner can simultaneously provide nutrient supply, nutrient deficiency relief, stress resistance repair, and quality improvement, and is suitable for foliar spraying of various crops.

[0011] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below. Detailed Implementation

[0012] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Example 1: Optimal formulation example. By weight, the following ingredients are used: 20 kg potassium dihydrogen phosphate, 15 kg potassium nitrate, 12 kg urea, 8.5 kg xylitol-chelated calcium and magnesium, 5 kg EDTA-stabilized complex trace elements, 2 kg anionic water-soluble polyglutamic acid with a molecular weight of 9000-11000 Da, 1.2 kg amino oligosaccharide with a degree of deacetylation of not less than 90% and a degree of polymerization of 2-8, and 51.3 kg deionized water. The mass ratio of calcium to magnesium in the xylitol-chelated calcium and magnesium is 2:1; the mass ratio of zinc, iron, boron, manganese, and copper in the EDTA-stabilized complex trace elements is 3:2:2:1:1.

[0014] In preparation, 51.3 kg of deionized water was added to a reaction vessel and stirred at 300 r / min for 5 min at room temperature to obtain a homogeneous base solvent. Then, 12 kg of urea, 15 kg of potassium nitrate, and 20 kg of potassium dihydrogen phosphate were added sequentially and stirred at 350 r / min for 18 min until completely dissolved to obtain a macro-element stable solution. 8.5 kg of xylitol-chelated calcium and magnesium and 5 kg of EDTA-stabilized complex trace elements were added and stirred at 450 r / min for 12 min to obtain a medium- and trace component complex solution. The stirring speed was adjusted to 250 r / min, and 2 kg of polyglutamic acid and 1.2 kg of amino oligosaccharide were slowly added and stirred at low speed for 10 min. After mixing, the mixture was allowed to stand at room temperature for 35 min to mature, and then filtered through a 120-mesh filter to obtain a clear and homogeneous finished product conditioner.

[0015] Example 2: Lower limit of proportion example. By weight, 18 kg of potassium dihydrogen phosphate, 12 kg of potassium nitrate, 10 kg of urea, 7 kg of xylitol chelated calcium and magnesium, 4 kg of EDTA-stabilized complex trace elements, 1.5 kg of polyglutamic acid, 0.8 kg of amino oligosaccharide, and 55.7 kg of deionized water were used. The specifications of each component were the same as in Example 1, and the preparation method was the same as in Example 1.

[0016] Example 3: Upper limit of the formulation example. By weight, take 22 kg of potassium dihydrogen phosphate, 18 kg of potassium nitrate, 14 kg of urea, 10 kg of xylitol chelated calcium and magnesium, 6 kg of EDTA-stabilized complex trace elements, 2.5 kg of polyglutamic acid, 1.5 kg of amino oligosaccharide, and 45 kg of deionized water. The specifications of each component are the same as in Example 1, and the preparation method is the same as in Example 1.

[0017] Comparative Example 1: A conventional ternary foliar fertilizer, using potassium dihydrogen phosphate, potassium nitrate and urea as the main effective components, was conventionally mixed by stirring. Xylitol chelated calcium and magnesium, EDTA stabilized complex trace elements, polyglutamic acid and amino oligosaccharides were not added, nor was the stepwise compounding and low-speed, low-shear bioactive component addition method of the present invention used.

[0018] Comparative Example 2: A common compound formulation, based on the weight parts of Example 1, in which xylitol chelated calcium and magnesium are replaced with ordinary calcium and magnesium raw materials, EDTA stable complex trace elements are replaced with ordinary trace element raw materials, polyglutamic acid is replaced with polyglutamic acid of undefined molecular weight, and amino oligosaccharides are replaced with ordinary oligosaccharides with low degree of deacetylation, and the stepwise compounding process of the present invention is not used.

[0019] Implementation effect verification: Facility-grown tomatoes were selected as the test object, and three treatment groups were set up: Example 1, Comparative Example 1 and Comparative Example 2. Under the same water, fertilizer, temperature and light management conditions, foliar spraying was carried out once every 10 days, for a total of 2 sprayings, and the test period was 30 days.

[0020] The observation results showed that the plants in Example 1 had thicker stems and dark green, thick leaves, and no obvious yellowing or curling of leaves. The plants grew relatively evenly. The plants in Comparative Example 1 grew weaker and showed slight nutrient deficiency and yellowing. The solution in Comparative Example 2 had a small amount of precipitation, uneven absorption on the leaf surface, and some leaves showed slight scorching edges. The plants in Comparative Example 2 had poor uniformity of growth.

[0021] Under high-temperature stress, no obvious plant wilting was observed in Example 1 group, and the incidence of leaf diseases was 1.8%; the incidence of diseases in Comparative Example 1 group was 13.2%, and the incidence of diseases in Comparative Example 2 group was 10.1%. These results indicate that the formulation of the present invention has good stress resistance and induced resistance performance under the experimental conditions described above.

[0022] In terms of yield and quality, the tomato fruit setting rate in Example 1 group increased by 16.5% compared to the control, the rate of deformed fruit decreased by 9.2%, the soluble solids content of the fruit increased by 2.0 percentage points, and the yield per mu increased by 17.3%. The above results indicate that the conditioner of the present invention can improve fruit setting, marketability, and yield performance in greenhouse tomato trials.

[0023] Application method: When using the conditioner of this invention as a liquid formulation, it can be diluted with water and sprayed according to the crop type, growth stage, and degree of stress. For conventional crops during the growing season, it can be diluted 800-1200 times; during the fruit expansion stage or under stress, it can be diluted 600-800 times; for seedlings or sensitive crops, it can be diluted 1200-1500 times. When spraying, it should evenly cover both sides of the leaves, young fruits, and tender shoots, ensuring the leaves are moist but not dripping.

[0024] When mixing and storing, the conditioner of this invention should be tested for compatibility with neutral or acidic agricultural inputs before mixing and use. It should not be directly mixed with strongly alkaline pesticides, lime sulfur, Bordeaux mixture, or other alkaline preparations. The product should be stored in a sealed container in a cool, dry, ventilated, and light-protected environment, avoiding the effects of high temperatures, direct sunlight, freezing, and acidic or alkaline corrosive substances.

[0025] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0026] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A highly stable and stress-resistant multifunctional plant foliar conditioner, characterized in that, It is prepared from the following raw materials in parts by weight: 18-22 parts potassium dihydrogen phosphate, 12-18 parts potassium nitrate, 10-14 parts urea, 7-10 parts sugar alcohol calcium magnesium, 4-6 parts chelated trace elements, 1.5-2.5 parts polyglutamic acid, 0.8-1.5 parts amino oligosaccharide, and 45-55 parts deionized water; The sugar alcohol calcium magnesium is a xylitol chelated calcium magnesium compound preparation, with a calcium to magnesium mass ratio of 2:1 based on elemental mass. The chelated trace elements are EDTA-stabilized composite trace elements containing EDTA-chelated zinc, EDTA-chelated iron, EDTA-chelated boron, EDTA-chelated manganese, and EDTA-chelated copper, with a ratio of zinc:iron:boron:manganese:copper of 3:2:2:1:1 by elemental mass.

2. The highly stable and stress-resistant multifunctional plant foliar conditioner according to claim 1, characterized in that, The polyglutamic acid is anionic, water-soluble polyglutamic acid with a molecular weight of 9000–11000 Da.

3. The highly stable and stress-resistant multifunctional plant foliar conditioner according to claim 1, characterized in that, The amino oligosaccharide is a chitosan-degraded oligoamino oligosaccharide with a degree of deacetylation of not less than 90% and a degree of polymerization of 2 to 8.

4. The highly stable and stress-resistant multifunctional plant foliar conditioner according to claim 1, characterized in that, It is prepared from the following raw materials in parts by weight: 20 parts potassium dihydrogen phosphate, 15 parts potassium nitrate, 12 parts urea, 8.5 parts xylitol chelated calcium and magnesium, 5 parts chelated trace elements, 2 parts polyglutamic acid, 1.2 parts amino oligosaccharide, and 51.3 parts deionized water.

5. A method for preparing a highly stable and stress-resistant multifunctional plant foliar conditioner according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Take deionized water according to the ratio, stir at 250-350 r / min for 3-8 min at room temperature to obtain a homogeneous base solvent; S2. Urea, potassium nitrate and potassium dihydrogen phosphate are added sequentially to the homogeneous substrate solvent, and the mixture is stirred at 300-400 r / min for 15-25 min to obtain a macro-element stable solution. S3. Add xylitol-chelated calcium-magnesium complex preparation and EDTA-stabilized complex trace elements to the macro-element stable solution, and stir at 400-500 r / min for 8-15 min to obtain a medium-trace component complex solution. S4. Adjust the stirring speed to 200-300 r / min, add polyglutamic acid and amino oligosaccharide to the micro-component composite solution, stir for 8-15 min, and obtain the composite conditioning solution. S5. After allowing the compound conditioning liquid to stand at room temperature for 25-45 minutes to mature, filter it to obtain a high-stability, stress-resistant, multifunctional plant foliar conditioner.

6. The preparation method according to claim 5, characterized in that, In step S1, stir at 300 r / min for 5 min; in step S2, stir at 350 r / min for 18 min; in step S3, stir at 450 r / min for 12 min; in step S4, stir at 250 r / min for 10 min; in step S5, let stand at room temperature for 35 min to mature.

7. The preparation method according to claim 5, characterized in that, In step S2, the urea, potassium nitrate and potassium dihydrogen phosphate are added to the homogeneous substrate solvent in batches and slowly to reduce the risk of instantaneous precipitation of high concentration salts.

8. The preparation method according to claim 5, characterized in that, In step S4, polyglutamic acid and amino oligosaccharides are added using a low-speed shear stirring method to reduce the risk of high shear damage to the polyglutamic acid molecular chain and the active structure of amino oligosaccharides.

9. The preparation method according to claim 5, characterized in that, In step S5, the filtration uses a 100-150 mesh filter, preferably a 120 mesh filter.