Liquid fertilizer and preparation method thereof

Abstract

The invention belongs to the technical field of liquid fertilizers and preparation thereof, and particularly relates to a liquid fertilizer and a preparation method thereof, the liquid fertilizer comprises the following components: a stabilizer, a nutritional agent for providing phosphorus element and / or potassium element, a surfactant and a biostimulant; wherein the stabilizer is Arabic gum and / or polyacrylamide, and the surfactant is fatty alcohol ether carboxylate and / or lignosulfonate. The liquid fertilizer disclosed by the invention has the advantages of being excellent in hard water resistance, high in phosphorus and potassium element utilization rate, capable of effectively relieving premature senility of crops such as wheat and the like, enhancing the stress resistance of the crops, improving the yield and the quality of the crops and the like; the compatibility problem of the biostimulant such as the seaweed extract and a high-phosphorus-potassium system is jointly solved, the effect of relieving premature senescence of crops is achieved by means of the dual effects of the biostimulant and phosphorus and potassium, the application range is further expanded, and the application method is simple and suitable for large-scale industrial application. The method for preparing the liquid fertilizer has the advantages of simple preparation steps, clear raw material ratio and the like, the whole process is easy to control, and the method is widely applicable to industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid fertilizer and preparation thereof, and particularly relates to liquid fertilizer and a preparation method thereof. Background Art

[0002] High phosphorus and potassium liquid fertilizer is a highly efficient liquid fertilizer with the advantages of comprehensive ingredients, high absorption and utilization rate, flexible and convenient fertilization, improved crop yield and quality, and environmental sustainability. However, in practical applications, there are still certain problems. The first is the hard water problem. Most of the water used by farmers to irrigate farmland is groundwater with high hardness. During the dilution and use of high phosphorus and potassium liquid fertilizer, phosphorus elements easily combine with metal ions such as calcium and magnesium in groundwater to form insoluble phosphate precipitates, resulting in relatively low utilization rate of phosphorus elements, thus affecting the use effect of fertilizers; secondly, the application effect under adverse conditions. Under extreme climatic conditions such as high temperature and drought, the effect of simple high phosphorus and potassium water-soluble fertilizers is not good after application, and it cannot effectively alleviate the phenomenon of premature aging of crops such as wheat.

[0003] Therefore, there is an urgent need to develop a functional liquid fertilizer with good hard water resistance, high phosphorus and potassium utilization rate, which can effectively alleviate the premature aging of crops such as wheat, enhance the stress resistance of crops, be convenient for farmers to apply in the field, and be suitable for large-scale industrial application, so as to improve the yield and quality of crops and meet the needs of farmers for functional liquid fertilizers. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art to a certain extent. To this end, the present invention provides a liquid fertilizer and a preparation method thereof. The liquid fertilizer of the present invention has the advantages of excellent hard water resistance, high phosphorus and potassium utilization, effective alleviation of premature aging of crops such as wheat, enhanced stress resistance of crops, and improved yield and quality of crops. While solving the compatibility problem of biostimulants such as seaweed extracts with high phosphorus and potassium systems, the dual effects of biostimulants and phosphorus and potassium are used to achieve the effect of alleviating premature aging of crops, further expanding the scope of application, and the application method is simple, which is suitable for large-scale industrial applications. The method for preparing liquid fertilizer of the present invention has the advantages of simple preparation steps, clear raw material ratios, etc. The whole process is easy to control and is widely applicable to industrial production.

[0005] The present invention proposes a liquid fertilizer. According to an embodiment of the present invention, the liquid fertilizer comprises the following components: a stabilizer, a nutrient providing phosphorus and / or potassium, a surfactant and a biostimulant; wherein the stabilizer is gum arabic and / or polyacrylamide, and the surfactant is a fatty alcohol ether carboxylate and / or lignin sulfonate. The liquid fertilizer according to the embodiment of the present invention has the advantages of excellent hard water resistance, high phosphorus and potassium utilization, effective alleviation of premature aging of crops such as wheat, enhanced stress resistance of crops, and improved yield and quality of crops. The stabilizer and the surfactant are used to jointly solve the compatibility problem of biostimulants such as seaweed extracts and high phosphorus and potassium systems, and the dual effects of biostimulants and phosphorus and potassium are used to achieve the effect of alleviating premature aging of crops, further expanding the scope of application, and the application method is simple, suitable for large-scale industrial applications.

[0006] According to an embodiment of the present invention, the above-mentioned liquid fertilizer may also have the following additional technical features:

[0007] According to an embodiment of the present invention, the biostimulant is seaweed extract.

[0008] According to an embodiment of the present invention, the seaweed extract includes one or more of alginic acid, seaweed polysaccharide, brown algin oligosaccharide, sodium alginate and alginate.

[0009] According to an embodiment of the present invention, the nutrient agent providing phosphorus and / or potassium comprises one or more of potassium pyrophosphate, phosphoric acid solution, ammonium polyphosphate and potassium dihydrogen phosphite. According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 50 parts by weight of seaweed extract, 100 to 200 parts by weight of potassium dihydrogen phosphite, 3 to 10 parts by weight of stabilizer, 10 to 35 parts by weight of surfactant, the final concentration of phosphorus is 300 to 600 g / L, and the final concentration of potassium is 300 to 500 g / L.

[0010] According to an embodiment of the present invention, the liquid fertilizer further comprises 300 to 800 parts by weight of water.

[0011] According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 4 parts by weight of gum arabic, 1 to 6 parts by weight of polyacrylamide, 480 to 700 parts by weight of potassium pyrophosphate; 5 to 25 parts by weight of phosphoric acid solution, 80 to 240 parts by weight of ammonium polyphosphate, 100 to 180 parts by weight of potassium dihydrogen phosphite, 5 to 15 parts by weight of fatty alcohol ether carboxylate, 5 to 20 parts by weight of lignin sulfonate, 2 to 50 parts by weight of seaweed extract, and 300 to 800 parts by weight of water.

[0012] According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 40 parts by weight of seaweed extract, 120 to 160 parts by weight of potassium dihydrogen phosphite, 4 to 8 parts by weight of a stabilizer, 15 to 25 parts by weight of a surfactant, the final concentration of phosphorus is 350 to 500 g / L, and the final concentration of potassium is 350 to 450 g / L.

[0013] According to an embodiment of the present invention, the liquid fertilizer further comprises 400 to 650 parts by weight of water.

[0014] According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 3 parts by weight of gum arabic, 1 to 5 parts by weight of polyacrylamide, 540 to 650 parts by weight of potassium pyrophosphate; 10 to 20 parts by weight of phosphoric acid solution, 120 to 220 parts by weight of ammonium polyphosphate, 140 to 160 parts by weight of potassium dihydrogen phosphite, 5 to 10 parts by weight of fatty alcohol ether carboxylate, 10 to 15 parts by weight of lignin sulfonate, 2 to 40 parts by weight of seaweed extract, and 400 to 650 parts by weight of water.

[0015] In a second aspect of the present invention, the present invention proposes a method for preparing the aforementioned liquid fertilizer. According to an embodiment of the present invention, the method comprises: mixing water, the stabilizer, the nutrient agent providing phosphorus and / or potassium, the surfactant and the biostimulant to obtain the liquid fertilizer. The preparation method according to an embodiment of the present invention has the advantages of simple preparation steps, clear raw material ratio, etc., and the whole process is easy to control and is widely applicable to industrial production.

[0016] According to an embodiment of the present invention, the above preparation method may also have the following additional technical features:

[0017] According to an embodiment of the present invention, the temperature during the mixing process is ≤40°C.

[0018] In a third aspect of the present invention, the present invention provides a method for using the aforementioned liquid fertilizer. According to an embodiment of the present invention, the method includes applying the aforementioned liquid fertilizer to crops. The method of use according to an embodiment of the present invention has the advantages of being simple in use and applicable to a variety of application methods, and is suitable for large-scale industrial applications.

[0019] According to an embodiment of the present invention, the above-mentioned method of use may also have the following additional technical features:

[0020] According to an embodiment of the present invention, the working concentration of the liquid fertilizer is 0.1% to 0.3%, and the application amount is 20 to 50 mL / mu.

[0021] According to an embodiment of the present invention, the application method of the high-phosphorus-potassium liquid fertilizer includes one or more of aerial spraying, soil application, foliar spraying and seed treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the stabilizer forming nano-scale microcapsules to encapsulate the biostimulant in Example 6 of the present invention. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0025] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0026] In this document, the terms “include” or “comprising” are open expressions, that is, including the contents specified in the present invention but not excluding other contents.

[0027] As used herein, the terms "optionally", "optional" or "optionally" generally mean that the subsequently described event or circumstance may but need not occur, and that the description includes instances where the event or circumstance occurs and instances where it does not.

[0028] The present invention provides a liquid fertilizer and a preparation method and a use method thereof, which will be described in detail below.

[0029] Liquid Fertilizer

[0030] The present invention proposes a liquid fertilizer. According to an embodiment of the present invention, the liquid fertilizer comprises the following components: a stabilizer, a nutrient providing phosphorus and / or potassium, a surfactant and a biostimulant; wherein the stabilizer is gum arabic and / or polyacrylamide, and the surfactant is a fatty alcohol ether carboxylate and / or lignin sulfonate. The liquid fertilizer according to the embodiment of the present invention has the advantages of excellent hard water resistance, high phosphorus and potassium utilization, effective alleviation of premature aging of crops such as wheat, enhanced stress resistance of crops, and improved yield and quality of crops. The stabilizer and the surfactant are used to jointly solve the compatibility problem of biostimulants such as seaweed extracts and high phosphorus and potassium systems, and the dual effects of biostimulants and phosphorus and potassium are used to achieve the effect of alleviating premature aging of crops, further expanding the scope of application, and the application method is simple, suitable for large-scale industrial applications.

[0031] According to an embodiment of the present invention, the biostimulant is a seaweed extract. Therefore, adding the biostimulant to the liquid fertilizer can further promote plant growth and improve the stress resistance of crops, thereby improving the quality and yield of crops. Exemplarily, the addition of alginic acid can increase the water retention capacity of the soil, help the growth of crops under drought conditions, enhance the stress resistance of crops, and promote the healthy growth of crops, thereby improving the quality and yield of crops.

[0032] According to an embodiment of the present invention, the seaweed extract comprises one or more of alginic acid, seaweed polysaccharide, brown algin oligosaccharide, sodium alginate and alginate. Therefore, adding seaweed extract to liquid fertilizer can further promote plant growth and improve the stress resistance of crops, thereby improving the quality and yield of crops.

[0033] According to an embodiment of the present invention, the stabilizer is gum arabic and / or polyacrylamide. Thus, by adding the stabilizer to the liquid fertilizer, the effective ingredients in the liquid fertilizer can be kept from precipitating by forming a three-dimensional network structure, thereby ensuring the uniformity, effectiveness and stability of the liquid fertilizer. Exemplarily, the addition of gum arabic and polyacrylamide stabilizers forms a nano-scale microcapsule state in the solution (refer to Figure 1 ), thereby encapsulating biostimulants such as seaweed extracts, effectively isolating the contact between biostimulants such as seaweed extracts and the high phosphorus and potassium system. The charges between the particles repel each other and it is difficult for them to aggregate to form large particle precipitation, which solves the compatibility problem of biostimulants such as seaweed extracts and the high phosphorus and potassium system.

[0034] According to an embodiment of the present invention, the nutrient agent providing phosphorus and / or potassium includes one or more of potassium pyrophosphate, phosphoric acid solution, ammonium polyphosphate and potassium dihydrogen phosphite. Thus, it is added to liquid fertilizer as a nutrient agent, which can provide sufficient phosphorus and potassium elements for crops, so as to significantly improve the efficiency of fertilizer action, enhance the stress resistance of crops, promote the healthy growth of crops, and thus improve the quality and yield of crops. Exemplarily, while providing sufficient phosphorus and potassium elements for crops, potassium dihydrogen phosphite can also inhibit crop diseases, enhance the stress resistance of crops, and further improve the quality and yield of crops.

[0035] According to an embodiment of the present invention, the surfactant is a fatty alcohol ether carboxylate and a lignin sulfonate. Thus, the addition of a surfactant solves the problem of flocculation in the high phosphorus potassium system in hard water, and reduces the surface tension of the liquid fertilizer, thereby improving its wettability on the surface of crops, helping the liquid fertilizer to better contact the crops, improving the absorption efficiency of the liquid fertilizer, and further improving the quality and yield of crops. Exemplarily, the fatty alcohol ether carboxylate has excellent anti-hard water stability and calcium soap dispersibility, and its stability is strong in both acidic and alkaline environments, and its molecular structure contains a hydrophilic carboxylate group and a hydrophobic alcohol ether group. When encountering hard water, multivalent cations such as calcium and magnesium ions in the hard water will preferentially combine with the carboxylate group of the fatty alcohol ether carboxylate. This combination mode is different from traditional anionic surfactants, and it will not form precipitation due to the action of calcium and magnesium ions like ordinary anionic surfactants. Because the calcium and magnesium salts formed by fatty alcohol ether carboxylates still have a certain degree of water solubility, they can effectively prevent flocculation caused by hard water; the functional groups with complexing properties in the lignin sulfonate molecules, such as hydroxyl, carboxyl and sulfonic acid groups, can complex with metal ions to form lignin-metal ion chelates. These active groups form coordination bonds with metal ions by providing electron pairs, thereby achieving chelation. The generated chelates have a certain degree of water solubility, so they can effectively prevent flocculation caused by hard water.

[0036] According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 50 parts by weight of seaweed extract, 100 to 200 parts by weight of potassium dihydrogen phosphite, 3 to 10 parts by weight of stabilizer, 10 to 35 parts by weight of surfactant, the final concentration of phosphorus is 300 to 600 g / L in terms of phosphorus pentoxide, and the final concentration of potassium is 300 to 500 g / L in terms of potassium oxide. Thus, the prepared liquid fertilizer has a high phosphorus and potassium content, and can provide sufficient phosphorus and potassium elements for crops; the addition of seaweed extract and potassium dihydrogen phosphite as biostimulants enhances the stress resistance of crops; the former two are compatible under the joint action of stabilizer and surfactant, so that crops can achieve the effect of alleviating premature aging of crops with the help of the dual effects of biostimulants and phosphorus and potassium, and further improve the quality and yield of crops.

[0037] Exemplarily, the liquid fertilizer includes 2 parts by weight of seaweed extract, 10 parts by weight of seaweed extract, 20 parts by weight of seaweed extract, 30 parts by weight of seaweed extract, 40 parts by weight of seaweed extract, 50 parts by weight of seaweed extract, preferably 20 to 50 parts by weight of seaweed extract, more preferably 30 to 50 parts by weight of seaweed extract. Thus, the stress resistance of crops is enhanced, and the quality and yield of crops are further improved.

[0038] Exemplarily, the liquid fertilizer includes 3 parts by weight of stabilizer, 4 parts by weight of stabilizer, 5 parts by weight of stabilizer, 6 parts by weight of stabilizer, 7 parts by weight of stabilizer, 8 parts by weight of stabilizer, 9 parts by weight of stabilizer, 10 parts by weight of stabilizer, preferably 4 to 8 parts by weight of stabilizer, more preferably 5 to 7 parts by weight of stabilizer. Thus, by forming a three-dimensional network structure, the active ingredients in the liquid fertilizer can be kept from precipitating, thereby ensuring the uniformity, effectiveness and stability of the liquid fertilizer, and jointly solving the compatibility problem of biostimulants such as seaweed extracts and high phosphorus and potassium systems with surfactants.

[0039] Exemplarily, the liquid fertilizer includes 10 parts by weight of a surfactant, 15 parts by weight of a surfactant, 20 parts by weight of a surfactant, 25 parts by weight of a surfactant, 30 parts by weight of a surfactant, 35 parts by weight of a surfactant, preferably 10 to 25 parts by weight of a surfactant, and more preferably 15 to 25 parts by weight of a surfactant. Thus, the problem of flocculation of a high phosphorus and potassium system in hard water is solved, and the compatibility problem of biostimulants such as seaweed extracts with a high phosphorus and potassium system is solved together with a stabilizer, further improving the quality and yield of crops.

[0040] According to an embodiment of the present invention, the liquid fertilizer further comprises 300 to 800 parts by weight of water. Thus, the addition of water enhances the fluidity of the liquid fertilizer, allows the effective components to be fully mixed, and further expands the scope of application.

[0041] According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 4 parts by weight of gum arabic, 1 to 6 parts by weight of polyacrylamide, 480 to 700 parts by weight of potassium pyrophosphate; 5 to 25 parts by weight of phosphoric acid solution, 80 to 240 parts by weight of ammonium polyphosphate, 100 to 180 parts by weight of potassium dihydrogen phosphite, 5 to 15 parts by weight of fatty alcohol ether carboxylates, 5 to 20 parts by weight of lignin sulfonates, 2 to 50 parts by weight of seaweed extracts, and 300 to 700 parts by weight of water. Thus, potassium pyrophosphate, phosphoric acid solution, ammonium polyphosphate and potassium dihydrogen phosphite provide sufficient phosphorus and potassium elements for crops; the addition of seaweed extracts and potassium dihydrogen phosphite as biostimulants enhances the stress resistance of crops; the former two are compatible with each other under the joint action of stabilizer gum arabic, polyacrylamide and surfactant fatty alcohol ether carboxylates and lignin sulfonates, so that crops can achieve the effect of alleviating premature aging of crops with the help of the dual action of biostimulants and phosphorus and potassium, and further improve the quality and yield of crops.

[0042] Exemplarily, the liquid fertilizer includes 2 parts by weight of gum arabic, 3 parts by weight of gum arabic, 4 parts by weight of gum arabic, preferably 2 to 3 parts by weight of gum arabic, thereby, it acts as a stabilizer together with surfactants fatty alcohol ether carboxylates and lignin sulfonates to solve the compatibility problem of biostimulants such as seaweed extracts with high phosphorus and potassium systems.

[0043] Exemplarily, the liquid fertilizer includes 1 part by weight of polyacrylamide, 2 parts by weight of polyacrylamide, 3 parts by weight of polyacrylamide, 4 parts by weight of polyacrylamide, 5 parts by weight of polyacrylamide, 6 parts by weight of polyacrylamide, preferably 1 to 5 parts by weight of polyacrylamide, thereby, it acts as a stabilizer together with surfactants such as fatty alcohol ether carboxylates and lignin sulfonates to solve the compatibility problem of biostimulants such as seaweed extracts with high phosphorus and potassium systems.

[0044] Exemplarily, the liquid fertilizer includes 480 parts by weight of potassium pyrophosphate, 500 parts by weight of potassium pyrophosphate, 550 parts by weight of potassium pyrophosphate, 600 parts by weight of potassium pyrophosphate, 650 parts by weight of potassium pyrophosphate, 700 parts by weight of potassium pyrophosphate, preferably 500-650 parts by weight of potassium pyrophosphate, thereby providing sufficient phosphorus and potassium elements for crops, further improving the quality and yield of crops.

[0045] Exemplarily, the liquid fertilizer includes 5 parts by weight of phosphoric acid solution, 10 parts by weight of phosphoric acid solution, 15 parts by weight of phosphoric acid solution, 20 parts by weight of phosphoric acid solution, 25 parts by weight of phosphoric acid solution, preferably 10 to 20 parts by weight of phosphoric acid solution, thereby providing sufficient phosphorus for crops, further improving the quality and yield of crops.

[0046] Exemplarily, the liquid fertilizer includes 80 parts by weight of ammonium polyphosphate, 100 parts by weight of ammonium polyphosphate, 120 parts by weight of ammonium polyphosphate, 140 parts by weight of ammonium polyphosphate, 160 parts by weight of ammonium polyphosphate, 180 parts by weight of ammonium polyphosphate, 200 parts by weight of ammonium polyphosphate, 220 parts by weight of ammonium polyphosphate, and 240 parts by weight of ammonium polyphosphate, preferably 100 to 220 parts by weight of ammonium polyphosphate, thereby providing sufficient phosphorus and nitrogen elements for crops, further improving the quality and yield of crops.

[0047] Illustratively, the liquid fertilizer includes 100 parts by weight of potassium dihydrogen phosphite, 120 parts by weight of potassium dihydrogen phosphite, 140 parts by weight of potassium dihydrogen phosphite, 160 parts by weight of potassium dihydrogen phosphite, and 180 parts by weight of potassium dihydrogen phosphite, preferably 120 to 160 parts by weight of potassium dihydrogen phosphite. Thus, while providing sufficient phosphorus and potassium elements for crops, it can also act as a biostimulant to inhibit crop diseases, enhance crop resistance, and further improve crop quality and yield.

[0048] Exemplarily, the liquid fertilizer includes 5 parts by weight of fatty alcohol ether carboxylates, 6 parts by weight of fatty alcohol ether carboxylates, 7 parts by weight of fatty alcohol ether carboxylates, 8 parts by weight of fatty alcohol ether carboxylates, 9 parts by weight of fatty alcohol ether carboxylates, 10 parts by weight of fatty alcohol ether carboxylates, 11 parts by weight of fatty alcohol ether carboxylates, 12 parts by weight of fatty alcohol ether carboxylates, 13 parts by weight of fatty alcohol ether carboxylates, 14 parts by weight of fatty alcohol ether carboxylates, and 15 parts by weight of fatty alcohol ether carboxylates, preferably 5 to 10 parts by weight of fatty alcohol ether carboxylates. As a result, the liquid fertilizer works together with the stabilizers gum arabic and polyacrylamide to effectively improve the flocculation problem of high phosphorus and potassium systems in hard water, solve the compatibility problem of biostimulants such as seaweed extracts with high phosphorus and potassium systems, and further improve the quality and yield of crops.

[0049] Exemplarily, the liquid fertilizer includes 5 parts by weight of lignin sulfonate, 6 parts by weight of lignin sulfonate, 7 parts by weight of lignin sulfonate, 8 parts by weight of lignin sulfonate, 9 parts by weight of lignin sulfonate, 10 parts by weight of lignin sulfonate, 11 parts by weight of lignin sulfonate, 12 parts by weight of lignin sulfonate, 13 parts by weight of lignin sulfonate, 14 parts by weight of lignin sulfonate, 15 parts by weight of lignin sulfonate, 17 parts by weight of lignin sulfonate, and 20 parts by weight of lignin sulfonate, preferably 10 to 15 parts by weight of lignin sulfonate, thereby working together with the stabilizers gum arabic and polyacrylamide to effectively improve the flocculation problem of the high phosphorus and potassium system in hard water, solve the compatibility problem of biostimulants such as seaweed extracts with the high phosphorus and potassium system, and further improve the quality and yield of crops.

[0050] Illustratively, the liquid fertilizer includes 2 parts by weight of seaweed extract, 10 parts by weight of seaweed extract, 20 parts by weight of seaweed extract, 30 parts by weight of seaweed extract, 40 parts by weight of seaweed extract, 50 parts by weight of seaweed extract, preferably 2 to 40 parts by weight of seaweed extract, thereby enhancing the stress resistance of crops and further improving the quality and yield of crops.

[0051] Exemplarily, the liquid fertilizer includes 400 parts by weight of water, 500 parts by weight of water, 600 parts by weight of water, 650 parts by weight of water, 700 parts by weight of water, preferably 400-650 parts by weight of water, thereby allowing the effective ingredients to be fully mixed and enhancing the fluidity of the liquid fertilizer.

[0052] According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 40 parts by weight of seaweed extract, 120 to 160 parts by weight of potassium dihydrogen phosphite, 4 to 8 parts by weight of stabilizer, 15 to 20 parts by weight of surfactant, the final concentration of phosphorus is 350 to 500 g / L in terms of phosphorus pentoxide, and the final concentration of potassium is 350 to 450 g / L in terms of potassium oxide. Thus, the prepared liquid fertilizer has a high phosphorus and potassium content, which can provide sufficient phosphorus and potassium elements for crops; the addition of seaweed extract and potassium dihydrogen phosphite as biostimulants enhances the stress resistance of crops; the former two are compatible under the joint action of stabilizer and surfactant, so that crops can achieve the effect of alleviating premature aging of crops with the help of the dual effects of biostimulants and phosphorus and potassium, and further improve the quality and yield of crops.

[0053] Exemplarily, the liquid fertilizer includes 2 parts by weight of seaweed extract, 10 parts by weight of seaweed extract, 20 parts by weight of seaweed extract, 30 parts by weight of seaweed extract, and 40 parts by weight of seaweed extract, thereby enhancing the stress resistance of crops and further improving the quality and yield of crops. Exemplarily, the liquid fertilizer includes 4 parts by weight of stabilizer, 5 parts by weight of stabilizer, 6 parts by weight of stabilizer, 7 parts by weight of stabilizer, and 8 parts by weight of stabilizer, thereby, by forming a three-dimensional network structure, the active ingredients in the liquid fertilizer can be kept from precipitating, thereby ensuring the uniformity, effectiveness and stability of the liquid fertilizer, and jointly solving the compatibility problem of biostimulants such as seaweed extracts with high phosphorus and potassium systems with surfactants.

[0054] Exemplarily, the liquid fertilizer includes 15 parts by weight of surfactant, 16 parts by weight of surfactant, 17 parts by weight of surfactant, 18 parts by weight of surfactant, 19 parts by weight of surfactant, 20 parts by weight of surfactant, and 25 parts by weight of surfactant. Thus, the problem of flocculation of the high phosphorus and potassium system in hard water is solved, and the compatibility problem of biostimulants such as seaweed extracts and the high phosphorus and potassium system is solved together with the stabilizer, further improving the quality and yield of crops.

[0055] According to an embodiment of the present invention, the liquid fertilizer further comprises 400 to 650 parts by weight of water. Thus, the addition of water enhances the fluidity of the liquid fertilizer, allows the effective components to be fully mixed, and further expands the scope of application.

[0056] According to an embodiment of the present invention, the liquid fertilizer comprises: 2 to 3 parts by weight of gum arabic, 1 to 5 parts by weight of polyacrylamide, 540 to 650 parts by weight of potassium pyrophosphate; 10 to 20 parts by weight of phosphoric acid solution, 120 to 220 parts by weight of ammonium polyphosphate, 140 to 160 parts by weight of potassium dihydrogen phosphite, 5 to 10 parts by weight of fatty alcohol ether carboxylates, 10 to 15 parts by weight of lignin sulfonates, 2 to 40 parts by weight of seaweed extracts, and 400 to 650 parts by weight of water. Thus, potassium pyrophosphate, phosphoric acid solution, ammonium polyphosphate and potassium dihydrogen phosphite provide sufficient phosphorus and potassium elements for crops; the addition of seaweed extracts and potassium dihydrogen phosphite as biostimulants enhances the stress resistance of crops; the former two are compatible with each other under the joint action of stabilizer gum arabic, polyacrylamide and surfactant fatty alcohol ether carboxylates and lignin sulfonates, so that crops can achieve the effect of alleviating premature aging of crops with the help of the dual action of biostimulants and phosphorus and potassium, and further improve the quality and yield of crops.

[0057] Exemplarily, the liquid fertilizer includes 2 parts by weight of gum arabic and 3 parts by weight of gum arabic, whereby it acts as a stabilizer together with surfactants such as fatty alcohol ether carboxylates and lignin sulfonates to solve the compatibility problem of biostimulants such as seaweed extracts with high phosphorus and potassium systems.

[0058] Exemplarily, the liquid fertilizer includes 1 part by weight of polyacrylamide, 2 parts by weight of polyacrylamide, 3 parts by weight of polyacrylamide, 4 parts by weight of polyacrylamide, and 5 parts by weight of polyacrylamide, thereby, as a stabilizer, together with surfactants such as fatty alcohol ether carboxylates and lignin sulfonates, solving the compatibility problem of biostimulants such as seaweed extracts with high phosphorus and potassium systems.

[0059] Exemplarily, the liquid fertilizer includes 540 parts by weight of potassium pyrophosphate, 580 parts by weight of potassium pyrophosphate, 600 parts by weight of potassium pyrophosphate, and 650 parts by weight of potassium pyrophosphate, thereby providing sufficient phosphorus and potassium elements for crops, further improving the quality and yield of crops.

[0060] Exemplarily, the liquid fertilizer includes 10 parts by weight of phosphoric acid solution, 15 parts by weight of phosphoric acid solution, and 20 parts by weight of phosphoric acid solution, thereby providing sufficient phosphorus elements for crops, further improving the quality and yield of crops.

[0061] Exemplarily, the liquid fertilizer includes 120 parts by weight of ammonium polyphosphate, 140 parts by weight of ammonium polyphosphate, 160 parts by weight of ammonium polyphosphate, 180 parts by weight of ammonium polyphosphate, 200 parts by weight of ammonium polyphosphate, and 220 parts by weight of ammonium polyphosphate, thereby providing sufficient phosphorus and nitrogen elements for crops, further improving the quality and yield of crops.

[0062] Exemplarily, the liquid fertilizer includes 140 parts by weight of potassium dihydrogen phosphite and 160 parts by weight of potassium dihydrogen phosphite. Thus, while providing sufficient phosphorus and potassium elements for crops, it can also act as a biostimulant to inhibit crop diseases, enhance crop resistance, and further improve crop quality and yield.

[0063] Illustratively, the liquid fertilizer includes 5 parts by weight of fatty alcohol ether carboxylates, 6 parts by weight of fatty alcohol ether carboxylates, 7 parts by weight of fatty alcohol ether carboxylates, 8 parts by weight of fatty alcohol ether carboxylates, 9 parts by weight of fatty alcohol ether carboxylates, and 10 parts by weight of fatty alcohol ether carboxylates, thereby working together with stabilizers such as gum arabic and polyacrylamide to effectively improve the flocculation problem of high-phosphorus and potassium systems in hard water, solve the compatibility problem of biostimulants such as seaweed extracts with high-phosphorus and potassium systems, and further improve the quality and yield of crops.

[0064] Exemplarily, the liquid fertilizer includes 10 parts by weight of lignin sulfonate, 11 parts by weight of lignin sulfonate, 12 parts by weight of lignin sulfonate, 13 parts by weight of lignin sulfonate, 14 parts by weight of lignin sulfonate, and 15 parts by weight of lignin sulfonate, thereby working together with stabilizers such as gum arabic and polyacrylamide to effectively improve the flocculation problem of high-phosphorus and potassium systems in hard water, solve the compatibility problem of biostimulants such as seaweed extracts with high-phosphorus and potassium systems, and further improve the quality and yield of crops.

[0065] Illustratively, the liquid fertilizer includes 2 parts by weight of seaweed extract, 10 parts by weight of seaweed extract, 20 parts by weight of seaweed extract, 30 parts by weight of seaweed extract, and 40 parts by weight of seaweed extract, thereby enhancing the stress resistance of crops and further improving the quality and yield of crops.

[0066] Illustratively, the liquid fertilizer includes 400 parts by weight of water, 500 parts by weight of water, 600 parts by weight of water, and 650 parts by weight of water, thereby allowing the effective ingredients to be fully mixed to enhance the fluidity of the liquid fertilizer.

[0067] Preparation method

[0068] The present invention proposes a method for preparing the aforementioned liquid fertilizer. According to an embodiment of the present invention, the method comprises: mixing water, the stabilizer, the nutrient agent providing phosphorus and / or potassium, the surfactant and the biostimulant to obtain the liquid fertilizer. The preparation method according to the embodiment of the present invention has the advantages of simple preparation steps, clear raw material ratio, etc. The whole process is easy to control and is widely applicable to industrial production.

[0069] According to an embodiment of the present invention, the temperature during the mixing process is ≤40° C. Exemplarily, the temperature during the mixing process is 25° C., 32° C., 34° C., 36° C., 38° C., 40° C., thereby maintaining the stability of the biostimulant such as seaweed extract and reducing the loss of key components.

[0070] How to use

[0071] In a third aspect of the present invention, the present invention provides a method for using the aforementioned liquid fertilizer. According to an embodiment of the present invention, the method includes applying the aforementioned liquid fertilizer to crops. The method of use according to an embodiment of the present invention has the advantages of being simple in use and applicable to a variety of application methods, and is suitable for large-scale industrial applications.

[0072] According to an embodiment of the present invention, the working concentration of the liquid fertilizer is 0.1%-0.3%, and the application amount is 20-50mL / mu. Thus, by accurately controlling the working concentration and the application amount, it is possible to ensure that crops obtain the right amount of nutrients while avoiding nutrient waste and environmental pollution caused by excessive fertilization, thereby reducing production costs and improving farmers' economic benefits.

[0073] According to an embodiment of the present invention, the liquid fertilizer application method includes one or more of aerial spraying, soil application, foliar spraying and seed treatment. Therefore, by adjusting the application method according to the application scenario, the nutrient requirements of crops at different growth stages can be more effectively met, the yield and quality of crops can be further improved, and the impact of liquid fertilizer on the environment can be reduced.

[0074] The scheme of the present invention will be explained below in conjunction with the embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used are not indicated by the manufacturer and are all conventional products that can be obtained commercially.

[0075] Example 1: Preparation of high phosphorus and potassium liquid fertilizer I

[0076] 650 parts by weight of water, 3 parts by weight of gum arabic and 1 part by weight of polyacrylamide are sequentially added into a container, and after stirring for 30 minutes, 540 parts by weight of potassium pyrophosphate, 120 parts by weight of ammonium polyphosphate and 140 parts by weight of potassium dihydrogen phosphite are added; then 8 parts by weight of fatty alcohol ether carboxylate and 10 parts by weight of lignin sulfonate are added, and finally 40 parts by weight of seaweed polysaccharide are added, and the mixture is uniformly mixed. The temperature of the whole preparation process must be strictly controlled below 40° C. to obtain high-phosphorus-potassium liquid fertilizer I.

[0077] Example 2: Preparation of high phosphorus and potassium liquid fertilizer II

[0078] 550 parts by weight of water, 2 parts by weight of gum arabic and 2 parts by weight of polyacrylamide are sequentially added into a container, and after stirring for 30 minutes, 550 parts by weight of potassium pyrophosphate, 150 parts by weight of ammonium polyphosphate, 150 parts by weight of potassium dihydrogen phosphite and 20 parts by weight of 85% phosphoric acid solution are added; then 5 parts by weight of fatty alcohol ether carboxylate and 10 parts by weight of lignin sulfonate are added, and finally 30 parts by weight of alginic acid are added, and the mixture is uniformly mixed. The temperature must be strictly controlled below 40° C. during the whole preparation process to obtain high phosphorus and potassium liquid fertilizer II.

[0079] Example 3: Preparation of high phosphorus and potassium liquid fertilizer III

[0080] 400 parts by weight of water, 3 parts by weight of gum arabic, and 5 parts by weight of polyacrylamide are sequentially added into a container, and after stirring for 30 minutes, 650 parts by weight of potassium pyrophosphate, 200 parts by weight of ammonium polyphosphate, 160 parts by weight of potassium dihydrogen phosphite, and 10 parts by weight of 85% phosphoric acid solution are added; 6 parts by weight of fatty alcohol ether carboxylate, 15 parts by weight of lignin sulfonate are added, and finally 2 parts by weight of sodium alginate and 30 parts by weight of brown algae oligosaccharide are added, and the mixture is uniformly mixed. The temperature must be strictly controlled below 40° C. during the whole preparation process to obtain high phosphorus and potassium liquid fertilizer III.

[0081] Example 4: Preparation of high phosphorus and potassium liquid fertilizer IV

[0082] 400 parts by weight of water, 2 parts by weight of gum arabic, and 5 parts by weight of polyacrylamide are sequentially added into a container, and after stirring for 30 minutes, 580 parts by weight of potassium pyrophosphate, 220 parts by weight of ammonium polyphosphate, 150 parts by weight of potassium dihydrogen phosphite, and 10 parts by weight of 85% phosphoric acid solution are added; then 10 parts by weight of fatty alcohol ether carboxylate, 10 parts by weight of lignin sulfonate are added, and finally 3 parts by weight of sodium alginate, 20 parts by weight of alginic acid, and 20 parts by weight of seaweed polysaccharide are added, and the temperature of the whole preparation process must be strictly controlled below 40° C. to obtain high-phosphorus-potassium liquid fertilizer IV.

[0083] Comparative Example 1: Preparation of high phosphorus and potassium liquid fertilizer CK1

[0084] Add 650 parts by weight of water, 3 parts by weight of gum arabic, and 1 part by weight of polyacrylamide to the container in sequence, and after stirring for 30 minutes, add 500 parts by weight of potassium pyrophosphate, 100 parts by weight of ammonium polyphosphate, and 120 parts by weight of potassium dihydrogen phosphite; finally, add 40 parts by weight of seaweed polysaccharide and mix evenly. The temperature must be strictly controlled below 40°C during the entire preparation process to obtain the control CK1.

[0085] Comparative Example 2: Preparation of high phosphorus and potassium liquid fertilizer CK2

[0086] Add 650 parts by weight of water to the container in sequence, stir for 30 minutes, then add 500 parts by weight of potassium pyrophosphate, 100 parts by weight of ammonium polyphosphate, and 120 parts by weight of potassium dihydrogen phosphite; then add 10 parts by weight of fatty alcohol ether carboxylate, 10 parts by weight of lignin sulfonate, and finally add 40 parts by weight of seaweed polysaccharide, mix well, and strictly control the temperature below 40°C during the whole preparation process to obtain high-phosphorus and potassium liquid fertilizer CK2.

[0087] Example 5: Hard Water Resistance Test of High Phosphorus and Potassium Liquid Fertilizers I to IV

[0088] The high phosphorus and potassium liquid fertilizers CK1, CK2 and I to IV samples prepared in Comparative Examples 1 and 2 and Examples 1 to 4 were respectively tested for hard water resistance in the following steps:

[0089] Take three 100mL samples of each of the high-phosphorus and potassium liquid fertilizers CK1, CK2 and I~IV for testing. The first sample is directly left to stand and observed for 4 hours. If there is no stratification, it is qualified; the second sample is diluted 20 times in 50°DH hard water and left to stand and observed for 4 hours. If the solution remains clear and no precipitate is formed, it is qualified; the third sample is diluted 300 times in 50°DH hard water and left to stand and observed for 4 hours. If the solution remains clear and no precipitate is formed, it is qualified; it is qualified only after all three tests are normal.

[0090] The hard water resistance test results of high phosphorus and potassium liquid fertilizer samples CK1, CK2 and I~IV are shown in Table 1.

[0091] Table 1 Hard water resistance test of high phosphorus and potassium liquid fertilizer samples I to IV

[0092]

[0093] The results showed that the high-phosphorus-potassium liquid fertilizer CK1 showed clear solutions without flocculation when allowed to stand directly for 4 hours or when allowed to stand in 50°DH hard water diluted 20 times for 4 hours, but showed stratification and precipitation when allowed to stand in 50°DH hard water diluted 300 times for 4 hours; the high-phosphorus-potassium liquid fertilizers CK2 and I~IV showed clear solutions without flocculation under the three test conditions of direct standing for 4 hours, standing in 50°DH hard water diluted 20 times for 4 hours, and standing in 50°DH hard water diluted 300 times for 4 hours, indicating that the high-phosphorus-potassium liquid fertilizers CK2 and I~IV are qualified, and the presence of fatty alcohol ether carboxylate is necessary.

[0094] Example 6: Storage stability test of high phosphorus and potassium liquid fertilizers I to IV

[0095] The high phosphorus and potassium liquid fertilizers CK1, CK2 and I to IV samples prepared in Comparative Examples 1 and 2 and Examples 1 to 4 were respectively taken for storage stability testing, and the steps are as follows:

[0096] Three 100 mL samples of each of the high-phosphorus-potassium liquid fertilizers CK1, CK2, and I-IV were taken for testing. The samples of high-phosphorus-potassium liquid fertilizers CK1, CK2, and I-IV were sealed in glass bottles and placed in a programmable high and low temperature test box at -20°C (low temperature), 25°C (normal temperature), and 54°C (high temperature) for 2 weeks. The storage stability of the samples was observed until the samples showed obvious precipitation or lost fluidity, and the results were recorded.

[0097] Opinions on the formation of nano-scale microcapsules of biostimulants by stabilizers Figure 1 .

[0098] The 2-week storage stability test results of high phosphorus and potassium liquid fertilizer samples CK1, CK2 and I~IV are shown in Table 2.

[0099] Table 2 2-week storage stability test results of high phosphorus and potassium liquid fertilizer CK1, CK2 and I~IV samples

[0100]

[0101] The results showed that high phosphorus potassium liquid fertilizer CK1 and I~IV showed no flocculation at -20℃ (low temperature), 25℃ (normal temperature), and 554℃ (high temperature) under three test conditions. High phosphorus potassium liquid fertilizer CK2 did not show flocculation at -20℃ (low temperature) and 25℃ (normal temperature), but showed flocculation at 54℃ (high temperature), indicating that high phosphorus potassium liquid fertilizer CK1 and I~IV have good storage stability, and the presence of gum arabic and polyacrylamide is necessary. The addition of gum arabic and polyacrylamide stabilizers forms nano-scale microcapsules in the solution (reference Figure 1 ), thereby encapsulating biostimulants such as seaweed extracts, effectively isolating the contact between biostimulants such as seaweed extracts and the high phosphorus and potassium system. The charges between the particles repel each other, making it difficult for them to aggregate to form large particle precipitation, making the high phosphorus and potassium liquid fertilizer stable.

[0102] Example 7: Xingtai field test of high phosphorus and potassium liquid fertilizers I to IV

[0103] From March to June 2024, field trials of high phosphorus and potassium liquid fertilizers I to IV were conducted in Xingtai, Hebei. The specific steps are as follows:

[0104] 1. Test field soil fertility test

[0105] The experimental field is located in Xingtai, Hebei. Soil samples were taken from the experimental field for soil fertility testing. The test results showed that the soil in the experimental field was at a medium fertility level.

[0106] 2. Experimental Group

[0107] Take high-phosphorus-potassium liquid fertilizers I to IV, dilute them 20 times with water, stir them evenly, and spray them on wheat leaves using a drone. The application period is the wheat heading stage and the grain filling stage. At this time, the working concentration of high-phosphorus-potassium liquid fertilizers I to IV is 0.2%, and the application amount is 30 mL / mu, which are respectively recorded as test group I (high-phosphorus-potassium liquid fertilizer I), test group II (high-phosphorus-potassium liquid fertilizer II), test group III (high-phosphorus-potassium liquid fertilizer III), and test group IV (high-phosphorus-potassium liquid fertilizer IV).

[0108] 3. Control group

[0109] Water was used as a control, and the wheat leaves were sprayed using a drone. The application period was the heading and filling stages of wheat, and the application amount was 30 mL / mu. This group was recorded as the control CK group.

[0110] 4. Determination of relevant parameters

[0111] Ten days after fertilization during the grain filling period, the flag leaf chlorophyll content, superoxidase (SOD), peroxidase (POD), number of spikelets, thousand-grain weight, per-acre yield and yield increase rate of wheat in the experimental field of the experimental group and the blank control group were tested. The specific steps are as follows:

[0112] (1) Determination of flag leaf chlorophyll content

[0113] a) Determination method: Chlorophyll meter method (SPAD instrument)

[0114] b) Measurement principle: The chlorophyll meter indirectly reflects the chlorophyll content in the leaves by measuring the light transmittance or reflectance of the leaves at a specific wavelength.

[0115] c) Determination steps:

[0116] Select leaves: Select fully expanded and healthy flag leaves on wheat plants;

[0117] Calibrate the instrument: Follow the instructions for use of the SPAD instrument to calibrate the instrument to ensure the accuracy of the measurement; Measurement location: Generally, the middle of the leaf is selected for measurement. Place the chlorophyll meter probe tightly against the leaf surface, press the measurement button, and read the chlorophyll content value displayed on the instrument;

[0118] Multiple measurements: In order to reduce errors, multiple measurements are performed on different parts of the same leaf or on different leaves, and the average value is taken as the chlorophyll content of the leaf.

[0119] (2) Determination of superoxidase (SOD)

[0120] a) Assay method: Superoxide dismutase (SOD) activity detection kit (purchased from Beijing BOXBIO Co., Ltd.)

[0121] b) Principle of determination: Xanthine and xanthine oxidase reaction system can produce superoxide anion (O 2 -), O 2 - can reduce nitro blue tetrazolium to form formazan, the product has a characteristic absorption peak at 560nm; SOD can remove O 2 -, thereby inhibiting the formation of formazan. The darker the color of the reaction solution, the lower the SOD activity, and vice versa. The activity of superoxide dismutase can be characterized by the change in absorbance.

[0122] c) Determination steps:

[0123] Select leaves: Select fully expanded and healthy flag leaves on wheat plants;

[0124] Determination process: Measure according to the steps of the kit;

[0125] Measuring instrument: ELISA reader, detection wavelength: 560nm.

[0126] (3) Determination of peroxidase (POD)

[0127] a) Assay method: Peroxidase (POD) activity detection kit (purchased from Beijing BOXBIO Co., Ltd.)

[0128] b) Assay principle: Peroxidase can catalyze H2O2 to oxidize guaiacol to generate dark brown 4-o-methoxyphenol. The product has a characteristic absorption peak at 470nm. The activity of peroxidase can be characterized by the change in absorbance.

[0129] c) Determination steps:

[0130] Select leaves: Select fully expanded and healthy flag leaves on wheat plants;

[0131] Determination process: Measure according to the steps of the kit;

[0132] Determination instrument: ELISA reader, detection wavelength: 470nm.

[0133] (4) Determination of grain number per ear

[0134] a) Sampling method: Four points were randomly selected for each treatment in the experimental area. At each point, one square meter or two rows of 2 meters (four rows of one meter) with uniform growth were selected for ear sampling. At the same time, the row spacing was measured and the sampling area was calculated.

[0135] b) Variety testing: Investigate the number of grains per ear at each point.

[0136] (5) Determination of Thousand-Kernel Weight

[0137] a) Sampling method: Four points were randomly selected for each treatment in the experimental area. At each point, one square meter or two rows of 2 meters (four rows of one meter) with uniform growth were selected for ear sampling. At the same time, the row spacing was measured and the sampling area was calculated.

[0138] b) Variety test: Investigate the thousand-grain weight at each point.

[0139] (6) Determination of yield per mu

[0140] a) Sampling method: Four points were randomly selected for each treatment in the experimental area. At each point, one square meter or two rows of 2 meters (four rows of one meter) with uniform growth were selected for ear sampling. At the same time, the row spacing was measured and the sampling area was calculated.

[0141] b) Seed testing: Investigate the number of valid ears (converted into ears per mu based on the sampling area), number of grains per ear, and thousand-grain weight at each point.

[0142] c) Determination of moisture content of fresh grains: Use a grain moisture meter to measure the moisture content of the grains, repeat 3 times and take the average.

[0143] d) Calculation of yield per mu:

[0144] Yield per mu (kg / mu) = actual grain weight*666.7 / actual harvested area*[1-fresh grain moisture content%)] / (1-13%)

[0145] (7) Calculation of yield increase rate

[0146] Yield increase rate (%) = (yield per mu of experimental treatment - yield per mu of control CK) / yield per mu of control CK * 100%. The results of the measurement of the effects of high phosphorus and potassium liquid fertilizers I to IV on wheat yield in Xingtai, Hebei are shown in Table 3.

[0147] Table 3 Effects of high phosphorus and potassium liquid fertilizers I to IV on wheat yield in Xingtai, Hebei

[0148]

[0149] The results show:

[0150] (1) In the wheat experimental field in Xingtai, Hebei, compared with the wheat in the control group CK, after spraying high phosphorus and potassium liquid fertilizer I, the chlorophyll content of the flag leaf of the wheat increased by 15.28%, the superoxidase activity increased by 10.66%, the peroxidase activity increased by 9.06%, the number of grains per ear increased by 1.3 grains, the thousand-grain weight increased by 5.42%, and the yield per mu increased by 8.28%;

[0151] (2) In the wheat experimental field in Xingtai, Hebei, compared with the wheat in the control group CK, after spraying high phosphorus and potassium liquid fertilizer II, the chlorophyll content of the flag leaf of the wheat increased by 11.79%, the superoxidase activity increased by 12.84%, the peroxidase activity increased by 11.05%, the number of grains per ear increased by 1.2 grains, the thousand-grain weight increased by 5.19%, and the yield per mu increased by 10.86%;

[0152] (3) In the wheat experimental field in Xingtai, Hebei, compared with the wheat in the control group CK, after spraying high phosphorus and potassium liquid fertilizer III, the chlorophyll content of the flag leaf of the wheat increased by 25.33%, the superoxidase activity increased by 19.23%, the peroxidase activity increased by 11.21%, the number of grains per ear increased by 3, the thousand-grain weight increased by 4.97%, and the yield per mu increased by 14.53%;

[0153] (4) In the wheat experimental field in Xingtai, Hebei, compared with the wheat in the control group CK, after spraying high-phosphorus-potassium liquid fertilizer IV, the chlorophyll content of the flag leaf of the wheat increased by 31.88%, the superoxidase activity increased by 21.25%, the peroxidase activity increased by 15%, the number of grains per ear increased by 3.3 grains, the thousand-grain weight increased by 4.74%, and the yield per mu increased by 15.33%.

[0154] The above results show that compared with the CK group, the liquid fertilizer prepared in the embodiment of the present invention can effectively alleviate the premature aging of crops such as wheat, enhance the stress resistance of crops, and improve the yield and quality of crops.

[0155] Example 8: Jining field test of high phosphorus and potassium liquid fertilizers I to IV

[0156] From March to June 2024, field trials of high phosphorus and potassium liquid fertilizers I to IV were conducted in Jining, Shandong. The steps are as follows:

[0157] 1. Test field soil fertility test

[0158] The experimental field is located in Jining, Shandong. Soil samples were taken from the experimental field for soil fertility testing. The test results showed that the soil in the experimental field was at an above-medium fertility level.

[0159] 2. Experimental Group

[0160] Take high phosphorus and potassium liquid fertilizers I to IV, dilute them 30 times with water, stir them evenly and spray them on wheat leaves with a drone. The application period is the heading stage and filling stage of wheat. At this time, the working concentration of high phosphorus and potassium liquid fertilizers I to IV is 0.2%, and the application amount is 40 mL / mu, which are respectively recorded as test group I' (high phosphorus and potassium liquid fertilizer I), test group II' (high phosphorus and potassium liquid fertilizer II), test group III' (high phosphorus and potassium liquid fertilizer III), and test group IV' (high phosphorus and potassium liquid fertilizer IV).

[0161] 3. Control group

[0162] Water was used as a control, and the wheat leaves were sprayed using a drone at the heading and filling stages of wheat. The application amount was 40 mL / mu. This group was recorded as the control CK' group.

[0163] 4. Determination of relevant parameters

[0164] Ten days after fertilization during the grain filling period, the flag leaf chlorophyll content, superoxidase (SOD), peroxidase (POD), number of grains per ear, thousand-grain weight, yield per mu and yield increase rate of wheat in the experimental field of the test group and the blank control group were detected. The determination method refers to (1) to (7) of the determination of the relevant parameters in step 4 of Example 7.

[0165] The results of the test on the effects of high phosphorus and potassium liquid fertilizers I to IV on wheat yield in Jining, Shandong are shown in Table 4.

[0166] Table 4 Effects of high phosphorus and potassium liquid fertilizers I to IV on wheat yield in Jining, Shandong

[0167]

[0168] The results show:

[0169] (1) In the wheat experimental field in Jining, Shandong, compared with the wheat in the control group CK', after spraying high phosphorus and potassium liquid fertilizer I, the chlorophyll content of the flag leaf of wheat increased by 18.24%, the superoxidase activity increased by 4.89%, the peroxidase activity increased by 5.03%, the number of grains per ear increased by 1.4 grains, the thousand-grain weight increased by 7.27%, and the yield per mu increased by 7.93%;

[0170] (2) In the wheat experimental field in Jining, Shandong, compared with the wheat in the control group CK', after spraying high phosphorus and potassium liquid fertilizer II, the chlorophyll content of the flag leaf of the wheat increased by 17.57%, the superoxidase activity increased by 6.95%, the peroxidase activity increased by 7.11%, the number of grains per ear increased by 1.6 grains, the thousand-grain weight increased by 7.27%, and the yield per mu increased by 12.38%;

[0171] (3) In the wheat experimental field in Jining, Shandong, compared with the wheat in the control group CK', after spraying high phosphorus and potassium liquid fertilizer III, the chlorophyll content of the flag leaf of the wheat increased by 22.97%, the superoxidase activity increased by 8.29%, the peroxidase activity increased by 7.63%, the number of grains per ear increased by 1.0 grain, the thousand-grain weight increased by 7.93%, and the yield per mu increased by 12.13%;

[0172] (4) In the wheat experimental field in Jining, Shandong, compared with the control CK' group wheat, after spraying high phosphorus and potassium liquid fertilizer IV, the chlorophyll content of the flag leaf of the wheat increased by 34.46%, the superoxidase activity increased by 9.31%, the peroxidase activity increased by 12.12%, the number of grains per ear increased by 3.7 grains, the thousand-grain weight increased by 8.37%, and the yield per mu increased by 12.65%.

[0173] The above results show that compared with the CK group, the liquid fertilizer prepared in the embodiment of the present invention can effectively alleviate the premature aging of crops such as wheat, enhance the stress resistance of crops, and improve the yield and quality of crops.

[0174] The results of Examples 7 to 8 show that the liquid fertilizer prepared in the embodiments of the present invention has high utilization rate of phosphorus and potassium elements, can effectively alleviate premature aging of crops such as wheat, enhance the stress resistance of crops, facilitate field application by farmers, improve the yield and quality of crops, and meet the needs of farmers for functional liquid fertilizers.

[0175] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A liquid fertilizer, characterized in that: The liquid fertilizer comprises the following components: Stabilizers, nutrients providing phosphorus and / or potassium, surfactants and biostimulants; Wherein, the stabilizer is gum arabic and / or polyacrylamide, The surfactant is fatty alcohol ether carboxylate and / or lignin sulfonate.

2. Liquid fertilizer according to claim 1, characterized in that, The biostimulant is a seaweed extract; Optionally, the seaweed extract comprises one or more of alginic acid, seaweed polysaccharide, brown algin oligosaccharide, sodium alginate and alginate; Optionally, the nutrient providing phosphorus and / or potassium includes one or more of potassium pyrophosphate, phosphoric acid solution, ammonium polyphosphate and potassium dihydrogen phosphite.

3. Liquid fertilizer according to claim 1, characterized in that, The liquid fertilizer comprises: 2 to 50 parts by weight of seaweed extract, 3 to 10 parts by weight of a stabilizer, 10 to 35 parts by weight of a surfactant, The final concentration of phosphorus is 300-600 g / L, calculated as phosphorus pentoxide. The final concentration of potassium is 300-500 g / L, calculated as potassium oxide; Optionally, the liquid fertilizer further comprises 300 to 800 parts by weight of water.

4. Liquid fertilizer according to claim 3, characterized in that, The liquid fertilizer comprises: 2 to 4 parts by weight of gum arabic, 1 to 6 parts by weight of polyacrylamide, 480-700 parts by weight of potassium pyrophosphate; 5 to 25 parts by weight of phosphoric acid solution, 80 to 240 parts by weight of ammonium polyphosphate, 100 to 180 parts by weight of potassium dihydrogen phosphite, 5 to 15 parts by weight of fatty alcohol ether carboxylate, 5 to 20 parts by weight of lignin sulfonate, 2 to 50 parts by weight of seaweed extract, 300 to 800 parts by weight of water.

5. Liquid fertilizer according to claim 1, characterized in that, The liquid fertilizer comprises: 2 to 40 parts by weight of seaweed extract, 4 to 8 parts by weight of a stabilizer, 15 to 25 parts by weight of a surfactant, The final concentration of phosphorus is 350-500 g / L, calculated as phosphorus pentoxide. The final concentration of potassium is 350-450 g / L, calculated as potassium oxide; Optionally, the liquid fertilizer further comprises 400 to 650 parts by weight of water.

6. Liquid fertilizer according to claim 5, characterized in that, The liquid fertilizer comprises: 2 to 3 parts by weight of gum arabic, 1 to 5 parts by weight of polyacrylamide, 540-650 parts by weight of potassium pyrophosphate; 10 to 20 parts by weight of phosphoric acid solution, 120 to 220 parts by weight of ammonium polyphosphate, 140 to 160 parts by weight of potassium dihydrogen phosphite, 5 to 10 parts by weight of fatty alcohol ether carboxylate, 10 to 15 parts by weight of lignin sulfonate, 2 to 40 parts by weight of seaweed extract, 400-650 parts by weight of water.

7. A method for preparing the liquid fertilizer according to any one of claims 1 to 6, characterized in that: The method comprises: Mixing water, the stabilizer, the nutrient agent providing phosphorus and / or potassium, the surfactant and the biostimulant to obtain the liquid fertilizer; Optionally, the temperature during the mixing process is ≤ 40°C.

8. A method for using the liquid fertilizer according to any one of claims 1 to 6, characterized in that: The method comprises applying the liquid fertilizer according to any one of claims 1 to 6 to crops.

9. The method according to claim 8, characterized in that The working concentration of the liquid fertilizer is 0.1-0.3%, and the application amount is 20-50 mL / mu.

10. The method according to claim 8, characterized in that The liquid fertilizer may be applied in one or more ways including aerial spraying, soil application, foliar spraying and seed treatment.

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