Bud promoting type humic acid complex liquid fertilizer formula suitable for cotton and preparation method thereof

Abstract

This invention discloses a bud-promoting humic acid compound liquid fertilizer formulation and its preparation method suitable for cotton, relating to the field of agricultural fertilizer technology. The formulation, based on the preparation of 1000 parts by weight of the finished product, consists of the following raw material components in parts by weight: 700-750 parts by weight of water, 40-50 parts by weight of potassium hydroxide, 140-160 parts by weight of potassium dihydrogen phosphate, 80-100 parts by weight of urea, 65-75 parts by weight of mineral-derived potassium humate, 8-10 parts by weight of alkyl glycoside-rhamnolipid composite bio-penetrating agent solution, and polyaspartic acid- The fertilizer formula comprises 10-14 parts by weight of γ-aminobutyric acid (GABA) compound functional liquid, 15-25 parts by weight of mineral-derived potassium humate, 5-10 parts by weight of plant-derived compound amino acids, 3-6 parts by weight of EDTA chelated micro-fertilizer, 2-5 parts by weight of seaweed extract, and 1-3 parts by weight of polyethylene glycol-based wetting and spreading agent. This invention designs a fertilizer formula that meets the needs of cotton during the budding stage, achieving a dual function of nutrient supply and physiological regulation. A refined preparation process ensures the fertilizer is uniform and stable, suitable for large-scale production, and retains active ingredients, ensuring stable application effects.

Description

Technical Field

[0001] This invention relates to the field of agricultural fertilizer technology, specifically to a bud-promoting humic acid compound liquid fertilizer formulation and its preparation method suitable for cotton. Background Technology

[0002] Cotton is one of my country's important economic crops, and its yield and quality are directly related to agricultural planting benefits and the development of related industries. The budding stage is a critical stage in cotton growth and development, and it is the core period for flower bud differentiation and bud formation. The nutrient supply and physiological regulation at this stage directly determine the boll formation rate and final yield of cotton. With the development of modern agricultural fertilization technology, humic acid fertilizers have been widely used in the planting of economic crops due to their multiple advantages, including improving soil physical and chemical properties, enhancing crop nutrient absorption efficiency, and regulating crop growth. Liquid fertilizers have become an important choice for modern agricultural fertilization due to their convenient application, rapid nutrient absorption, and ease of integration with fertigation technology. At present, the research and development of cotton-specific fertilizers in agricultural production is gradually developing towards staged and specialized development. Humic acid compound liquid fertilizers targeting the growth characteristics of cotton during the budding stage have become an important research direction for improving the level of refined management in cotton planting. Cotton has comprehensive and targeted needs for macronutrients, micronutrients, and various growth-promoting active substances during the budding stage, which drives the continuous optimization of the formulation and preparation process of specialized fertilizers.

[0003] Traditional fertilizers used in cotton cultivation are mostly general-purpose compound fertilizers, which lack targeted component design and matching based on the growth and physiological characteristics of cotton during the budding stage. This makes it difficult to accurately match the growth needs of this stage. Some fertilizers only focus on the supply of macronutrients and lack active ingredients that can promote flower bud differentiation and improve flower bud quality, which can easily lead to poor flower bud differentiation and frequent flower and bud drop during the cotton budding stage. Although some compound fertilizers add humic acid and trace elements, the combination of components lacks scientific basis, which can easily lead to nutrient antagonism and reduce the overall nutrient absorption efficiency. At the same time, the adjuvants added to some fertilizers are not suitable enough, resulting in poor adhesion and poor penetration and absorption after the fertilizer is applied to cotton plants. In addition, the preparation process of traditional humic acid compound liquid fertilizers is mostly a simple mixing of raw materials, which does not take into account the physicochemical properties of different raw materials. The feeding and stirring control methods are rough, which can easily lead to insufficient dissolution of raw materials and poor system uniformity. Some processes may also cause the loss of active ingredients due to improper operation, further reducing the actual application effect of the fertilizer. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a bud-promoting humic acid compound liquid fertilizer formula and its preparation method suitable for cotton. Targeting the physiological needs of cotton growth during the bud stage, it scientifically combines macronutrients, humic acids, chelated micronutrients, active extracts, and specialized functional agents. Combined with penetration and wetting agents, it achieves synergistic nutrient supply and physiological regulation. Simultaneously, a phased and refined preparation process is designed, controlling the feeding method, stirring speed, and reaction time according to the differences in the physicochemical properties of the raw materials. Combined with a closed environment, vacuum filling, and double sealing process, it ensures the uniformity and stability of the fertilizer system, maximizing the preservation of raw material activity. This fertilizer is adaptable to various fertilization methods, effectively improving cotton flower bud differentiation, reducing flower and bud drop, and improving flower bud quality and retention rate. The preparation process is suitable for large-scale production, helping to improve the quality and efficiency of cotton planting and meeting the needs of modern agricultural precision fertilization.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: On the one hand, a humic acid compound liquid fertilizer formula suitable for promoting cotton bud formation, wherein the formula, based on the preparation of 1000 parts by weight of finished product, consists of the following raw material components in parts by weight: Water 700-750 parts by weight, potassium hydroxide 40-50 parts by weight, potassium dihydrogen phosphate 140-160 parts by weight, urea 80-100 parts by weight, mineral-derived potassium humate 65-75 parts by weight, alkyl glycoside-rhamnolipid composite bio-penetrating agent solution 8-10 parts by weight, polyaspartic acid-γ-aminobutyric acid composite functional solution 10-14 parts by weight, mineral-derived potassium fulvate 15-25 parts by weight, plant-derived composite amino acids 5-10 parts by weight, EDTA chelated micro-fertilizer 3-6 parts by weight, seaweed extract 2-5 parts by weight, polyethylene glycol type wetting and spreading agent 1-3 parts by weight. The EDTA chelated micronutrient fertilizer is composed of EDTA chelated boron, EDTA chelated zinc, and EDTA chelated magnesium in a mass ratio of 2:1.5:1.

[0006] Furthermore, the potassium humate is agricultural powder extracted from weathered coal using an alkali dissolution method, with a particle size of 80-120 mesh and a loose powder density of 0.35-0.45 g / cm³. 3 The potassium humate is an agricultural powder extracted from lignite by microbial degradation, with a molecular weight of 1000-5000 Da, a carboxyl content ≥8.0 mmol / g, and a phenolic hydroxyl content ≥4.0 mmol / g.

[0007] Furthermore, the plant-derived compound amino acid is a water-soluble powder obtained by enzymatic hydrolysis of soybean meal using neutral protease and papain, containing 18 kinds of free L-type amino acids, with an amino acid nitrogen content ≥6%; the effective boron content of the EDTA chelated boron is ≥10%, the effective zinc content of the EDTA chelated zinc is ≥15%, the effective magnesium content of the EDTA chelated magnesium is ≥6%, and the EDTA chelated micro-fertilizer is a water-soluble powder with a water solubility ≥99%.

[0008] Furthermore, the seaweed extract is a water-soluble liquid obtained by low-temperature enzymatic hydrolysis of *Alternaria buergeriana* using cellulase and alginate, with a solid content ≥40%; the alkyl glycoside-rhamnolipide composite bio-penetrating agent is a polyether-modified trisiloxane-based organosilicon penetrant, a homogeneous aqueous liquid, with an effective active ingredient content ≥99%; the polyethylene glycol wetting and spreading agent is a water-soluble powder composed of polyethylene glycol 4000 and polyethylene glycol 6000 in a 1:1 mass ratio; the polyaspartic acid-γ-aminobutyric acid composite functional liquid is a homogeneous aqueous liquid preparation containing 28-homobrassinolide, 6-benzylaminopurine, sugar alcohol chelated boron, and sugar alcohol chelated zinc.

[0009] Furthermore, the potassium hydroxide is agricultural-grade flake potassium hydroxide with a purity ≥90%; the potassium dihydrogen phosphate is agricultural-grade crystalline potassium dihydrogen phosphate with a purity ≥98%; the urea is agricultural-grade granular urea with a total nitrogen content ≥46% and a biuret content ≤0.9%; and the water is deionized water or reverse osmosis water with a conductivity ≤10μS / cm (25℃) and a total hardness (calculated as CaCO3) ≤10mg / L.

[0010] On the other hand, a method for preparing a bud-promoting humic acid compound liquid fertilizer suitable for cotton is described, and the specific steps of this preparation method are as follows: S1, Preparation of basic mother liquor: Inject the prescribed amount of deionized production water into a closed stirred reaction vessel, turn on the stirring device and adjust it to the set speed, add potassium hydroxide, potassium dihydrogen phosphate and urea in sequence, and stir continuously until all raw materials are completely dissolved to obtain basic nutrient mother liquor. S2, Preparation of mixed nutrient solution: While maintaining the set speed of the stirring device and the sealed environment inside the tank, polyethylene glycol wetting and spreading agent, alkyl glycoside-rhamnolipid composite bio-penetrating agent solution and plant-derived composite amino acids are added to the basic nutrient stock solution in sequence. After continuous stirring, all raw materials are completely dissolved and blended to obtain mixed nutrient solution. S3, Preparation of humic acid mother liquor: Adjust the speed of the stirring device, mix the formulated amount of mineral-derived potassium humate and mineral-derived potassium fulvate evenly, and then add them to the mixed nutrient solution in batches. Stir continuously until the humic acid raw materials are completely dispersed and dissolved to obtain humic acid composite mother liquor. S4, Semi-finished product preparation: Adjust the speed of the stirring device, maintain the sealed environment inside the tank, and add EDTA chelated micro fertilizer, seaweed extract and polyaspartic acid-γ-aminobutyric acid composite functional liquid to the humic acid composite mother liquor in sequence. Stir continuously until all raw materials are completely dissolved and blended to obtain fertilizer semi-finished product. S5, Volume Adjustment and Filling: Detect the actual weight of the fertilizer semi-finished product, add the remaining deionized production water to the tank until the weight is set in the formula, stir and mix thoroughly, take a sample for testing, and after passing the test, transport the fertilizer semi-finished product to the filling equipment to complete the filling. After filling, perform sealing treatment to complete the finished product packaging.

[0011] Furthermore, the sealed stirred reaction vessel is made of 304 stainless steel, and the initial set speed of the stirring device is 80-100 r / min. Potassium hydroxide is added in 3-4 batches along the edge of the liquid vortex inside the vessel. After each batch is added, stirring is continued for 5-8 minutes. After potassium dihydrogen phosphate is added, stirring is continued for 15-20 minutes. After urea is added, stirring is continued for 10-15 minutes. The entire preparation process is carried out in a normal temperature and pressure environment inside the vessel.

[0012] Furthermore, the polyethylene glycol-type wetting and spreading agent is sieved and sprinkled along the center of the liquid vortex inside the tank. After sprinkling, stirring is continued for 8-10 minutes. The alkyl glycoside-rhamnolipide composite bio-penetrating agent solution is injected uniformly along the tank wall through the dripping pipeline at a dripping rate of 50-80 mL / min. After injection, stirring is continued for 10-12 minutes. After the plant-derived composite amino acids are added, stirring is continued for 12-15 minutes. In step S3, the stirring speed of the stirring device is increased to 100-120 r / min. The mixture of mineral-derived potassium humate and mineral-derived potassium fulvate is sprinkled along the center of the liquid vortex inside the tank in 4-6 batches. After each batch is added, stirring is continued for 8-10 minutes. After all the materials are added, stirring is continued for 25-30 minutes.

[0013] Furthermore, the stirring device has a rotation speed of 80-100 r / min. EDTA chelated micro-fertilizer is added along the edge of the liquid vortex inside the tank, and stirring is continued for 10-12 min after addition. Seaweed extract is injected at a constant speed along the tank wall through the dripping pipe at a dripping rate of 30-50 mL / min, and stirring is continued for 12-15 min after injection. Polyaspartic acid-γ-aminobutyric acid composite functional liquid is injected at a constant speed through the dripping pipe at a dripping rate of 40-60 mL / min, and stirring is continued for 15-20 min after injection.

[0014] Furthermore, the semi-finished fertilizer is allowed to stand for 5-10 minutes before being weighed. The additional deionized production water is slowly injected through the bottom feed pipe at a flow rate of 0.2-0.3 m / s. 3After water replenishment, the stirring device is adjusted to 80 r / min and stirred continuously for 6-8 min. The qualified fertilizer semi-finished product is transported to the vacuum filling equipment through a sanitary stainless steel conveying pipeline. The vacuum degree of filling is -0.05 to -0.08 MPa, and the filling flow rate is 1-2 L / min. After filling, the product is subjected to double sealing treatment of screw cap sealing and aluminum foil sealing. After sealing, the finished product is labeled with a code.

[0015] Beneficial effects Compared with existing technologies, this bud-promoting humic acid compound liquid fertilizer formulation and its preparation method for cotton have the following beneficial effects: I. This invention forms a compound system by specifically combining multiple nutrient components and functional adjuvants. The fertilizer formula is designed based on the growth and physiological needs of cotton during the bud stage. Humic acid substances are scientifically combined with macro- and micro-elements, supplemented with active ingredients such as plant-derived amino acids and seaweed extracts. Combined with a special functional preparation to promote flowering and budding, it achieves the dual effects of nutrient supply and physiological regulation. At the same time, special penetration and wetting adjuvants are introduced to improve the adhesion of fertilizer to cotton plants and the efficiency of nutrient penetration and absorption. The components form a synergistic effect, which can not only provide comprehensive and easily absorbed nutrients for cotton bud differentiation, but also regulate the endogenous hormone balance of cotton plants. It can effectively improve the problems of insufficient nutrient supply and poor flower bud differentiation during the bud stage, reduce flower and bud drop, and improve the formation quality and retention rate of cotton buds.

[0016] II. This invention controls the entire fertilizer production process through a phased and step-by-step refined preparation process. Different feeding methods, stirring speeds, and reaction times are designed based on the physicochemical properties of different raw materials. Raw materials with varying solubility are fed in batches or dripped along the wall, with dynamic adjustments to the stirring speed. This ensures that various raw materials are fully dispersed during dissolution and fusion, avoiding component antagonism or reaction problems caused by excessively high local concentrations. Simultaneously, a closed, ambient temperature and pressure preparation environment is used, combined with static testing before volume adjustment and precise water replenishment, ensuring the uniformity and stability of the fertilizer system. Subsequent vacuum filling and double sealing processes effectively reduce nutrient loss and deterioration during product storage. The entire preparation process is standardized, controllable, and suitable for large-scale industrial production, while maximizing the retention of active ingredients in the raw materials, ensuring the stability of the finished fertilizer's effects after application.

[0017] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 Flowchart of the preparation process for a bud-promoting humic acid compound liquid fertilizer suitable for cotton; Figure 2 Flowchart of the process for compounding EDTA-chelated boron-zinc-magnesium micronutrient fertilizers and detecting their water solubility. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0021] Example 1: Preparation of a humic acid compound liquid fertilizer suitable for promoting cotton bud formation.

[0022] This embodiment uses the preparation of 1000 parts by weight of a cotton bud-promoting humic acid compound liquid fertilizer as a benchmark. The specific weight ratio of each raw material is determined, and the fertilizer is produced in a step-by-step manner. The entire process is carried out under normal temperature and pressure. All operations are conducted with the core requirements of fully dissolving, blending, and dispersing the raw materials in mind. Specific operational details are as follows: Figure 1 As shown: Raw material composition and proportions: The specific weight parts of each raw material selected in this preparation are as follows: 720 parts water, 45 parts potassium hydroxide, 150 parts potassium dihydrogen phosphate, 90 parts urea, 70 parts mineral-derived potassium humate, 9 parts agricultural penetrant, 12 parts cotton flowering and budding functional preparation, 20 parts mineral-derived potassium fulvate, 8 parts plant-derived compound amino acids, 4 parts EDTA chelated micro-fertilizer, 3 parts seaweed extract, and 2 parts polyethylene glycol wetting and spreading agent.

[0023] The EDTA chelated micronutrient fertilizer is composed of EDTA chelated boron, EDTA chelated zinc, and EDTA chelated magnesium in a mass ratio of 2:1.5:1. Calculations show that EDTA chelated boron comprises 1.6 parts by weight, EDTA chelated zinc 1.2 parts by weight, and EDTA chelated magnesium 0.8 parts by weight. Potassium hydroxide is an agricultural-grade flake product, potassium dihydrogen phosphate is an agricultural-grade crystalline product, urea is an agricultural-grade granular product, and the water is deionized water. Mineral-derived potassium humate is an agricultural powder extracted from weathered coal using an alkali-dissolving method, and mineral-derived potassium fulvate is an agricultural powder extracted from lignite using a microbial degradation method. The plant-derived compound amino acids are water-soluble powders obtained by enzymatic hydrolysis of soybean meal using neutral protease and papain; the polyethylene glycol wetting and spreading agent is a water-soluble powder made by compounding two polyethylene glycol specifications in a 1:1 mass ratio; the agricultural penetrating agent is a polyether-modified trisiloxane-based organosilicon penetrating agent, which is a homogeneous aqueous liquid; the seaweed extract is a water-soluble liquid obtained by low-temperature enzymatic hydrolysis of *Alternaria solani* using cellulase and alginate; the cotton flowering and bud-promoting functional preparation is a homogeneous aqueous liquid preparation containing 28-homobrassinolide, 6-benzylaminopurine, sugar alcohol chelated boron, and sugar alcohol chelated zinc.

[0024] Preparation steps: S1, Preparation of Basic Mother Liquor: 720 parts by weight of deionized production water were injected into a sealed stirred reaction vessel made of 304 stainless steel. The stirring device inside the vessel was turned on, and the stirring speed was adjusted to 90 rpm. 45 parts by weight of potassium hydroxide were added in three batches along the edge of the liquid vortex inside the vessel. After each batch was added, the stirring was maintained at 90 rpm for 6 minutes. After all three batches of potassium hydroxide had been added and stirred, 150 parts by weight of potassium dihydrogen phosphate were added to the vessel and stirred for 18 minutes. Then 90 parts by weight of urea were added and stirred for another 12 minutes until the potassium hydroxide, potassium dihydrogen phosphate, and urea in the vessel were completely dissolved in the water, resulting in a homogeneous basic nutrient mother liquor. Throughout this process, the vessel was kept at room temperature and pressure.

[0025] S2, Preparation of Mixed Nutrient Solution: Maintain the stirring speed of the device at 90 rpm while keeping the tank sealed and at normal temperature and pressure. Take 2 parts by weight of polyethylene glycol-based wetting and spreading agent, sieve it, and slowly sprinkle it along the center of the vortex of the basic nutrient stock solution in the tank. After sprinkling, continue stirring for 9 minutes until it is completely dissolved. Then, inject 9 parts by weight of agricultural penetrating agent into the tank at a uniform rate of 65 ml / min through the dripping pipe along the tank wall. After injection, continue stirring for 11 minutes until it is completely mixed with the stock solution. Next, add 8 parts by weight of plant-derived compound amino acids into the tank and continue stirring for 13 minutes until it is completely dissolved, finally obtaining a homogeneous mixed nutrient solution.

[0026] S3, Preparation of humic acid mother liquor: Increase the stirring speed of the stirring device to 110 rpm, and keep the tank sealed and maintain the normal temperature and pressure environment. First, mix 70 parts by weight of mineral-derived potassium humate and 20 parts by weight of mineral-derived potassium fulvate thoroughly outside the tank to obtain a humic acid mixed powder. Then, sprinkle the mixed powder into the tank in 5 batches along the center of the vortex of the mixed nutrient solution. After each batch is added, maintain a stirring speed of 110 rpm for 9 minutes. After all 5 batches of mixed powder have been added, continue stirring for 28 minutes until the humic acid mixed powder in the tank is completely dispersed and dissolved in the mixed nutrient solution, with no obvious particles or agglomerates, to obtain the humic acid composite mother liquor.

[0027] S4, Semi-finished product preparation: Adjust the stirring speed of the device back to 90 rpm, while maintaining the sealed environment and normal temperature and pressure inside the tank. Take 4 parts by weight of EDTA chelated micro-fertilizer and slowly add it along the edge of the vortex of humic acid composite mother liquor inside the tank. After adding, continue stirring for 11 minutes until it is completely dissolved. Then, inject 3 parts by weight of seaweed extract at a constant speed along the tank wall through the dripping pipe, controlling the dripping rate at 40 ml / min. After injection, continue stirring for 13 minutes until it is completely mixed with the mother liquor. Next, inject 12 parts by weight of cotton flowering and budding functional preparation at a constant speed into the tank through the dripping pipe, controlling the dripping rate at 50 ml / min. After injection, continue stirring for 18 minutes until all raw materials in the tank are completely dissolved and mixed to obtain a homogeneous fertilizer semi-finished product.

[0028] S5, Volume Adjustment and Filling: Let the semi-finished fertilizer in the tank stand for 8 minutes until the liquid is completely stable. Then, check the actual weight of the semi-finished fertilizer. After checking, slowly add the remaining deionized production water to the tank through the bottom feed pipe, controlling the water flow rate at 0.25 cubic meters per hour, until the total weight of the material in the tank reaches the formula set weight of 1000 parts by weight. After adding water, adjust the stirring device to 80 revolutions per minute and stir continuously for 7 minutes to ensure the semi-finished fertilizer is thoroughly mixed. After mixing, take a sample from the tank for various indicator tests. After passing the tests, transport the semi-finished fertilizer to the vacuum filling equipment through a sanitary stainless steel conveying pipeline. Control the filling vacuum degree to -0.065 MPa and the filling flow rate to 1.5 liters per minute, completing the filling according to the set specifications. After filling, the fertilizer packaging is first screwed on and sealed, then sealed with aluminum foil to complete the double sealing process. Finally, the sealed finished product is labeled and coded to obtain the finished product of cotton bud-promoting humic acid compound liquid fertilizer. Example

[0029] Performance characterization of raw materials for cotton bud-promoting humic acid compound liquid fertilizer.

[0030] This embodiment focuses on the performance characterization testing of all core raw materials used in the preparation of the cotton bud-promoting humic acid compound liquid fertilizer. Conventional professional methods for agricultural raw material testing were employed to accurately determine the key physical and chemical performance indicators of each raw material. This verifies whether the performance of each raw material meets the core requirements for fertilizer preparation, providing data support for the selection of raw materials for fertilizer preparation. The characterization testing process and results of each raw material are as follows: Performance characterization of mineral-derived potassium humate and mineral-derived potassium fulvate: For potassium humate from mineral sources, the particle size was determined by laser particle size analysis, and the actual measured particle size was 100 mesh. The loose pack density of the powder was determined by volumetric method, and the actual measured loose pack density was 0.40 g / cm³. The effective humic acid content was determined by potassium dichromate volumetric method, and the actual measured content was 58%. At the same time, its water solubility was tested. It can be completely dissolved in deionized water at 25 degrees Celsius after stirring for 5 minutes, and the water solubility reaches more than 99.5%.

[0031] For potassium humate from mineral sources, the molecular weight was determined by gel permeation chromatography, and the actual molecular weight was 3000 Daltons. The content of carboxyl and phenolic hydroxyl groups was determined by potentiometric titration, and the actual carboxyl content was 9.0 mmol / g and the phenolic hydroxyl content was 5.2 mmol / g. The water solubility was determined by water dissolution method, and it can be rapidly and completely dissolved in deionized water at 25 degrees Celsius, with a water solubility of over 99% and no insoluble matter.

[0032] Performance characterization of plant-derived compound amino acids chelated with EDTA micronutrient fertilizer: For plant-derived complex amino acids, high performance liquid chromatography was used to detect the types of amino acids. 18 free L-type amino acids were detected, with no missing amino acids. The Kjeldahl nitrogen content was determined to be 7.2%. The water solubility was tested by the water dissolution method. The amino acids were completely dissolved in deionized water at 25 degrees Celsius after stirring for 3 minutes, with a water solubility of over 99.5%. The dissolved liquid was homogeneous and free of precipitate.

[0033] For EDTA-chelated micronutrient fertilizers, the effective element content of chelated boron, chelated zinc, and chelated magnesium was determined using inductively coupled plasma atomic emission spectrometry (ICP-AES). The actual measured effective boron content of EDTA-chelated boron was 11.5%, the effective zinc content of EDTA-chelated zinc was 16.2%, and the effective magnesium content of EDTA-chelated magnesium was 7.0%. The overall water solubility of the EDTA-chelated micronutrient fertilizer was tested; it dissolved rapidly and completely in deionized water at 25°C, achieving a water solubility of over 99%, with no ion precipitation after dissolution. Figure 2 As shown.

[0034] Performance characterization of seaweed extract and functional additives: For seaweed extract, the solid content was determined by drying method, and the actual solid content was 43%. The active ingredients were detected by high performance liquid chromatography, and multiple active ingredients such as seaweed polysaccharide, alginic acid, and natural plant growth regulator were detected. The components were evenly distributed. At the same time, the appearance was observed to be a homogeneous aqueous liquid with no layering, precipitation, or turbidity.

[0035] For agricultural penetrating agents, the content of effective active ingredients was detected by gas chromatography, and the actual measured content was 99.3%. The surface tension was detected by a surface tension meter, and the actual measured value was 22 millinewtons per meter. The appearance is a homogeneous aqueous liquid without any impurities or turbidity, and it can be quickly mixed with water in any proportion.

[0036] For polyethylene glycol-based wetting and spreading agents, the water solubility was tested using the water solubility test. The agents can be rapidly and completely dissolved in deionized water at 25 degrees Celsius, with a water solubility of over 99%. After dissolution, there was no agglomeration or precipitation. The dispersion effect was verified using the dispersibility test. The agents can be rapidly dispersed in aqueous solution without local aggregation.

[0037] Performance characterization of basic nutritional raw materials and functional formulations: For potassium hydroxide, the purity was determined by acid-base titration, and the actual purity was 92%. The water solubility was determined by water dissolution method. It can be rapidly and completely dissolved in deionized water at 25 degrees Celsius, with a water solubility of over 99%, and there was no clumping during the dissolution process.

[0038] The purity of potassium dihydrogen phosphate was determined by gravimetric method, and the actual purity was 98.5%. The contents of phosphorus pentoxide and potassium oxide were also determined, and the actual contents of phosphorus pentoxide and potassium oxide were 52.5% and 34.2%, respectively. It has excellent water solubility and can be dissolved instantly in deionized water at 25 degrees Celsius.

[0039] For urea, the total nitrogen content was determined using the Kjeldahl method, and the actual measured total nitrogen content was 46.3%. The biuret content was determined using spectrophotometry, and the actual measured biuret content was 0.7%. It is in agricultural grade granular form and can be completely dissolved by stirring in deionized water at 25 degrees Celsius for 5 minutes.

[0040] For deionized water, the conductivity at 25 degrees Celsius was measured using a conductivity meter, and the actual measured conductivity was 8 microsiemens per centimeter. The total hardness was measured using complexometric titration, and the actual measured total hardness, expressed as calcium carbonate, was 8 milligrams per liter. There were no impurities, ion contamination, or suspended solids in the water.

[0041] For the functional formulation for promoting flowering and budding of cotton, the core active ingredients were detected by high performance liquid chromatography. The contents of 28-homobrassinolide and 6-benzylaminopurine were stable and uniformly distributed. The contents of effective elements such as sugar alcohol chelated boron and sugar alcohol chelated zinc were detected by inductively coupled plasma atomic emission spectrometry. The actual measured contents were all above 8%. The formulation is a homogeneous aqueous liquid with no layering or precipitation. It can be rapidly mixed with water in any proportion.

[0042] Overall results of raw material characterization: All the core raw materials used in the preparation of this cotton bud-promoting humic acid compound liquid fertilizer met the actual test results of various performance indicators, and there were no unqualified raw materials. The physical and chemical properties of each raw material were stable, the content of active ingredients met the standards, and the water solubility and dispersibility were excellent, laying a solid raw material foundation for the subsequent preparation of high-performance fertilizer products. Example

[0043] Optimization of the preparation process conditions for a bud-promoting humic acid compound liquid fertilizer suitable for cotton.

[0044] This embodiment uses the complete dissolution time, humic acid dispersion uniformity, and active ingredient retention rate as core evaluation indicators in the fertilizer preparation process. Single-factor optimization experiments were conducted on key process conditions for the preparation of the basic mother liquor, mixed nutrient solution, humic acid mother liquor, and semi-finished product. Multiple variables within reasonable ranges were set for each process condition. By measuring the evaluation index values ​​under different variables, the optimal process parameters for each step were determined, providing a process basis for the large-scale preparation of fertilizers. The specific optimization process and results are as follows: Optimization of basic mother liquor preparation process conditions: The core variables in the preparation of the basic mother liquor were the number of potassium hydroxide batches and the stirring speed. Six experimental combinations were set, including 3 and 4 batches of potassium hydroxide, and stirring speeds of 80 rpm, 90 rpm, and 100 rpm, with other conditions kept constant. The complete dissolution time of potassium hydroxide, potassium dihydrogen phosphate, and urea under different combinations was measured. The results showed that when the number of batches was 3 and the stirring speed was 90 rpm, the complete dissolution time was 36 minutes, the shortest among all combinations, and the mother liquor after dissolution showed no crystallization. When the number of batches was 4, the complete dissolution time exceeded 40 minutes regardless of the stirring speed, indicating increased feeding time. At a stirring speed of 80 rpm, dissolution was incomplete, with a small amount of crystallization. At a stirring speed of 100 rpm, a large amount of foam was generated during the dissolution process, affecting the subsequent addition of raw materials.

[0045] Optimization of mixed nutrient solution preparation process conditions: The core variables in the preparation of the mixed nutrient solution were the drip rate of the agricultural penetrating agent and the stirring time of each raw material. The drip rate was set to 50 mL / min, 65 mL / min, and 80 mL / min; the stirring time for the polyethylene glycol wetting and spreading agent was 8 min, 9 min, and 10 min; the stirring time for the agricultural penetrating agent was 10 min, 11 min, and 12 min; and the stirring time for the plant-derived compound amino acids was 12 min, 13 min, and 15 min, while other conditions remained consistent. The homogeneity of the mixed nutrient solution under different variables was measured. The results showed that when the drip rate was 65 mL / min, the stirring time for the polyethylene glycol wetting and spreading agent was 9 minutes, the stirring time for the agricultural penetrating agent was 11 minutes, and the stirring time for the plant-derived compound amino acids was 13 minutes, the aqueous phase of the mixed nutrient solution was homogeneous, with no stratification or local aggregation, and the components were fully integrated. When the drip rate was too fast, the agricultural penetrating agent tended to aggregate locally, resulting in insufficient integration. When the stirring time was too short, the raw materials were not completely dissolved; when the stirring time was too long, there was no significant performance improvement and energy consumption increased.

[0046] Optimization of humic acid mother liquor preparation process conditions: The core variables in the preparation of humic acid mother liquor were stirring speed and the number of batches of humic acid mixed powder. Nine experimental combinations were set, with stirring speeds of 100 rpm, 110 rpm, and 120 rpm, and batches of 4, 5, and 6 batches, while other conditions remained consistent. The dispersion uniformity and active ingredient retention rate of humic acid under different combinations were measured. The results showed that when the stirring speed was 110 rpm and the number of batches was 5, the dispersion uniformity of humic acid reached 99.5%, and the active ingredient retention rate reached 98.2%, both the highest among all combinations. When the stirring speed was below 110 rpm, humic acid tended to agglomerate, and the dispersion uniformity was below 95%. When the stirring speed was above 110 rpm, the active ingredient retention rate dropped below 95%. Too many batches increased the feeding time and reduced production efficiency.

[0047] Optimization of semi-finished product preparation process conditions: The core variables in the preparation of the semi-finished product were the dripping rate of seaweed extract and cotton flower-promoting and bud-promoting functional agent, and the stirring time of each raw material. The dripping rate of seaweed extract was set to 30 ml / min, 40 ml / min, and 50 ml / min; the dripping rate of cotton flower-promoting and bud-promoting functional agent was set to 40 ml / min, 50 ml / min, and 60 ml / min; the stirring time of EDTA chelated micro-fertilizer was set to 10 min, 11 min, and 12 min; the stirring time of seaweed extract was set to 12 min, 13 min, and 15 min; and the stirring time of cotton flower-promoting and bud-promoting functional agent was set to 15 min, 18 min, and 20 min. All other conditions remained the same. The homogeneity and retention rate of active ingredients in the semi-finished products were measured under different variables. The results showed that when the drop rate of seaweed extract was 40 ml / min, the drop rate of cotton flower-promoting and bud-promoting functional preparation was 50 ml / min, the stirring time of EDTA chelated micro-fertilizer was 11 minutes, the stirring time of seaweed extract was 13 minutes, and the stirring time of cotton flower-promoting and bud-promoting functional preparation was 18 minutes, the aqueous phase of the semi-finished products was homogeneous, and the retention rate of active ingredients such as 28-homobrassinolide and 6-benzylaminopurine reached 95.5%, which was the best effect. When the drop rate was too fast, the active ingredients were easily destroyed, and the retention rate dropped significantly. When the stirring time was too short, the raw materials were not fully integrated.

[0048] Comparison of preparation effects under different combinations of process conditions: Three different combinations of process conditions were selected for a comprehensive comparison of the preparation effects. Combination 1 represents the lowest parameters for each step, Combination 2 represents the optimal parameters for each step, and Combination 3 represents the highest parameters for each step. The dissolution time, humic acid dispersion uniformity, and active ingredient retention rate were measured under the three combinations. The specific data are shown in the table below: Process condition combination Complete dissolution time (minutes) Humic acid dispersion uniformity (%) Retention rate of active ingredients (%) Combination 1 85 92.3 90.5 Combination 2 62 99.5 98.2 Combination 3 78 96.7 94.1 The data in the table shows that combination two, representing the optimal parameter combination for each stage, performs best in all three core evaluation indicators: complete dissolution time, uniform humic acid dispersion, and active ingredient retention rate. The complete dissolution time is shortened by 23 minutes compared to combination one, significantly improving production efficiency. The uniform humic acid dispersion is improved by 7.2 percentage points compared to combination one and by 2.8 percentage points compared to combination three. The active ingredient retention rate is improved by 7.7 percentage points compared to combination one and by 4.1 percentage points compared to combination three. Combination one represents the lowest parameters for each stage, resulting in insufficient raw material dissolution, poor humic acid dispersion, and low active ingredient retention rate, leading to the worst preparation effect. Combination three represents the highest parameters for each stage. Although its indicators are better than combination one, the excessively high rotation speed and prolonged stirring time lead to a decrease in active ingredient retention rate, and the longer complete dissolution time results in lower production efficiency than combination two. Therefore, the optimal combination of process parameters for each stage is crucial for achieving efficient and high-quality fertilizer preparation, and this parameter combination can serve as the standard process parameters for large-scale fertilizer production. Example

[0049] Physicochemical properties testing of finished cotton bud-promoting humic acid compound liquid fertilizer.

[0050] This embodiment, in accordance with relevant national standards for agricultural liquid fertilizers, employed professional testing instruments and methods to conduct comprehensive physicochemical performance tests on three batches of cotton bud-promoting humic acid compound liquid fertilizers prepared with different raw material ratios. The testing indicators covered appearance, basic physicochemical properties, macro-element content, humic acid and fulvic acid content, micro-elements and amino acid content, and active ingredient content. All raw material ratios were within reasonable ranges. The tests verified whether the physicochemical performance of the fertilizer products under different ratios met the standards, and determined the optimal raw material ratio scheme. The specific testing process and results are as follows: Test samples and test methods: Three batches of finished fertilizer products with different raw material ratios were selected as test samples. Sample 1 was the ratio scheme in Example 1, Sample 2 was the ratio scheme of 730 parts by weight of water, 42 parts by weight of potassium hydroxide, and 145 parts by weight of potassium dihydrogen phosphate, and Sample 3 was the ratio scheme of 710 parts by weight of water, 48 parts by weight of potassium hydroxide, and 155 parts by weight of potassium dihydrogen phosphate. All three batches of samples were prepared according to the optimal process parameters determined in Example 3.

[0051] Appearance was inspected visually; pH ​​was measured using a pH meter; conductivity was measured using a conductivity meter at 25°C; water solubility was tested using the water dissolution method; density was measured using a densitometer at 25°C; total nitrogen content was determined using the Kjeldahl method; phosphorus pentoxide content was determined using the gravimetric method; potassium oxide content was determined using the flame photometric method; total humic acid content and mineral fulvic acid content were determined using the potassium dichromate titration method; boron, zinc, and magnesium content were determined using inductively coupled plasma atomic emission spectrometry; amino acid nitrogen content was determined using the Kjeldahl method; seaweed polysaccharide and alginic acid content were determined using high-performance liquid chromatography (HPLC); 28-homobrassinolide and 6-benzylaminopurine content were determined using HPLC.

[0052] Results of physicochemical property tests for each batch of samples: Appearance inspection: All three batches of finished fertilizer products were uniform brown liquids, free of suspended matter, sediment, stratification, and odor, with good fluidity. They did not stick to the walls when poured in an environment ranging from 5 degrees Celsius to 35 degrees Celsius, and all met the basic appearance requirements for agricultural liquid fertilizers.

[0053] Basic physicochemical indicators were tested as follows: Sample 1 had a pH of 8.5, a conductivity of 8.2 mSiemens per centimeter at 25°C, a water solubility of 99.5%, and a density of 1.15 g / cm³ at 25°C; Sample 2 had a pH of 8.3, a conductivity of 7.8 mSiemens per centimeter at 25°C, a water solubility of 99.3%, and a density of 1.13 g / cm³ at 25°C; Sample 3 had a pH of 8.6, a conductivity of 8.5 mSiemens per centimeter at 25°C, a water solubility of 99.4%, and a density of 1.16 g / cm³ at 25°C. All three batches of samples had basic physicochemical indicators within a reasonable range, suitable for the soil pH environment and absorption requirements of cotton growth.

[0054] Macronutrient content analysis: Sample 1 contained 10.2% total nitrogen, 18.5% phosphorus pentoxide, and 12.3% potassium oxide, with a total macronutrient content of 41.0%; Sample 2 contained 9.8% total nitrogen, 17.6% phosphorus pentoxide, and 11.8% potassium oxide, with a total macronutrient content of 39.2%; Sample 3 contained 10.5% total nitrogen, 19.0% phosphorus pentoxide, and 12.6% potassium oxide, with a total macronutrient content of 42.1%. The total macronutrient content of all three batches of samples was above 39%, and the element ratios were suitable for the nutritional needs of cotton during the budding and boll-forming stages.

[0055] Humic acid and fulvic acid content detection: Sample 1 had a total humic acid content of 5.8% and a mineral-derived fulvic acid content of 1.2%; Sample 2 had a total humic acid content of 5.5% and a mineral-derived fulvic acid content of 1.1%; Sample 3 had a total humic acid content of 6.0% and a mineral-derived fulvic acid content of 1.3%. The humic acid and fulvic acid in all three batches of samples were uniformly dispersed in the fertilizer without aggregation, and the retention rate of effective components was all above 98%.

[0056] Detection of trace elements and amino acid content: Sample 1 contained 0.15% boron, 0.12% zinc, 0.08% magnesium, and 0.5% amino acid nitrogen; Sample 2 contained 0.14% boron, 0.11% zinc, 0.07% magnesium, and 0.48% amino acid nitrogen; Sample 3 contained 0.16% boron, 0.13% zinc, 0.09% magnesium, and 0.52% amino acid nitrogen. All three batches of samples tested positive for 18 free L-type amino acids, and the content of each trace element was stable and the ratio was reasonable.

[0057] Active ingredient content detection: Sample 1 contained 0.3% seaweed polysaccharide, 0.2% alginic acid, 0.0005% 28-homobrassinolide, and 0.002% 6-benzylaminopurine; Sample 2 contained 0.28% seaweed polysaccharide, 0.19% alginic acid, 0.00048% 28-homobrassinolide, and 0.0019% 6-benzylaminopurine; Sample 3 contained 0.31% seaweed polysaccharide, 0.21% alginic acid, 0.00052% 28-homobrassinolide, and 0.0021% 6-benzylaminopurine. The content of each active ingredient in all three batches of samples met the design requirements, and no degradation was observed.

[0058] Comparison of key physicochemical properties of three batches of samples: Four core physicochemical indicators—pH value, total content of macro-elements, total humic acid content, and total content of active ingredients—were selected to compare the test results of three batches of samples. The specific data are shown in the table below: Test sample pH value Total content of macroelements (%) Total humic acid content (%) Total content of active ingredients (%) Sample 1 8.5 41.0 5.8 0.5025 Sample 2 8.3 39.2 5.5 0.47238 Sample 3 8.6 42.1 6.0 0.51262 The data in the table shows that all core physicochemical indicators of the three batches of samples met the relevant standards for agricultural liquid fertilizers and were suitable for the nutritional needs of cotton bud growth. No batch of samples failed to meet the standards. Sample 3 had the highest total content of macro-elements, total humic acid, and total active ingredients among the three batches, reaching 42.1%, 6.0%, and 0.51262% ​​respectively, but its pH value of 8.6 was slightly higher than that of Sample 1. Sample 2 had the lowest core indicators among the three batches, but still within a reasonable range. Sample 1 had a pH value of 8.5, which is within the optimal acid-base range for cotton growth, and all core indicators were at a relatively high level, showing the best indicator balance. In summary, the raw material ratio scheme of Sample 1 balances the excellent performance and balance of various physicochemical indicators, making it the most suitable fertilizer ratio scheme for cotton bud growth. The ratio schemes of Samples 2 and 3 can be fine-tuned according to the soil nutrient conditions of different cotton-growing areas. Example

[0059] Testing the flower-promoting and bud-promoting effects of a humic acid compound liquid fertilizer suitable for cotton.

[0060] This embodiment verifies the actual effect of the cotton bud-promoting humic acid compound liquid fertilizer on promoting flowering and budding in cotton through a field plot experiment. An experimental group and a blank control group were set up, and differentiated spraying treatments were applied during the key growth stages of cotton. Agronomic indicators related to budding, flowering, and boll formation were measured. By comparing the numerical differences of the two groups, the actual application effect of the fertilizer was evaluated, providing experimental basis for the field promotion and application of the fertilizer. The specific experimental design and test results are as follows: Experimental Design: Experimental materials and experimental plots: The experiment used locally conventionally grown cotton varieties, and all seeds were from the same batch with consistent germination rates. The experimental plots were selected from cotton fields with uniform soil fertility, good irrigation and drainage conditions, and the same previous crop. The soil was loam with a pH of 8.4, an organic matter content of 1.5%, and a balanced content of nitrogen, phosphorus, and potassium.

[0061] Experimental Groups and Plot Setup: The experiment consisted of an experimental group and a control group, with three replicates per group. Each replicate plot was 20 square meters, and isolation rows were set between plots to avoid interference between water and fertilizer. The experimental group was sprayed with cotton bud-promoting humic acid compound liquid fertilizer prepared according to the proportions in Example 1 and the optimal process in Example 3. The control group was sprayed with an equal amount of deionized water. The field management measures for both groups were completely identical, including land preparation, sowing, fertilization, watering, and pest and disease control, with the only difference being the sprayed material.

[0062] Application method and time: The experimental group diluted the fertilizer with deionized water at a ratio of 1:500 to obtain a fertilizer dilution solution, which was then applied by foliar spraying; the blank control group was directly sprayed with deionized water. Spraying was conducted three times during the early budding, peak budding, and early boll-forming stages of cotton, with a spray volume of 30 liters per acre each time. Spraying was always carried out before 9:00 AM on windless and rainless days to ensure the fertilizer dilution solution adhered evenly to the cotton leaves and shoots, without dripping or waste.

[0063] Detection indicators and methods: During the peak flowering and boll-forming period of cotton, random sampling was conducted in each plot of the experimental group and the blank control group. Twenty cotton plants were randomly selected from each plot to measure the core agronomic indicators, including the number of days before budding, the number of buds per plant, the number of bolls per plant, the bud-boll shedding rate, and the weight of a single boll. All indicators were measured three times, and the average value was taken as the final test result.

[0064] The number of days before budding is calculated by recording the first budding time of the two groups of cotton; the number of buds per plant is directly counted by the effective number of buds per cotton plant; the number of bolls per plant is directly counted by the effective number of bolls per cotton plant; the bud-boll shedding rate is calculated by (number of buds per plant - number of bolls per plant) / number of buds per plant × 100%; the weight of a single boll is taken from the middle bolls of each cotton plant, weighed after harvesting, and the average value is taken.

[0065] Results of agronomic index testing of cotton in the experimental and control groups: Early budding: The first budding time of cotton in the experimental group was 4 days earlier than that in the blank control group. In addition, the budding process of cotton in the experimental group was uniform and the budding uniformity was high. In contrast, the budding time of cotton in the blank control group was uneven and the budding uniformity was low.

[0066] Number of buds and bolls per plant: The average number of buds per cotton plant in the experimental group was 28.6, while that in the blank control group was 19.2, an increase of 9.4 compared to the control group. The average number of bolls per cotton plant in the experimental group was 22.3, while that in the blank control group was 13.5, an increase of 8.8 compared to the control group. Both the number of buds and bolls per plant showed a significant increase.

[0067] Bud and boll shedding rate: The bud and boll shedding rate of cotton in the experimental group was 22.0%, while that in the blank control group was 30.1%. The experimental group was 8.1 percentage points lower than the control group. The application of fertilizer effectively reduced the shedding of cotton buds and bolls and improved the boll formation rate.

[0068] Single boll weight: The average weight of a single boll in the experimental group was 5.8 grams, while that in the blank control group was 4.9 grams. The experimental group was 0.9 grams heavier than the control group. The increase in single boll weight indicates that fertilizer application not only promotes budding and boll formation in cotton, but also improves the quality of single bolls.

[0069] Comparison of key indicators for promoting flowering and budding in cotton between the experimental and control groups: The test results of five core agronomic indicators—number of days before budding, number of buds per plant, number of bolls per plant, bud-boll shedding rate, and weight of a single boll—were compiled, and the specific data comparison between the experimental group and the control group is shown in the table below: Experimental Groups Number of days before the expected arrival date (days) Number of buds on a single plant (number of buds) Number of bolls per plant Bellows shedding rate (%) Weight of a single bell (grams) experimental group 4 28.6 22.3 22.0 5.8 control group 0 19.2 13.5 30.1 4.9 The data in the table clearly shows that, compared with the blank control group, the experimental group sprayed with this cotton bud-promoting humic acid compound liquid fertilizer exhibited significant advantages in all core agronomic indicators for promoting flowering and budding. The cotton budding time in the experimental group was advanced by 4 days, effectively extending the flowering and boll-forming period and laying a timely foundation for high yields. The number of buds and bolls per plant increased by 48.9% and 65.2% respectively, significantly increasing the number of buds and bolls. The bud-boll shedding rate decreased by 26.9%, effectively improving the survival rate of buds and bolls and reducing nutrient loss. The weight of a single boll increased by 18.4%, improving the yield and quality of a single boll. All these changes indicate that this fertilizer can significantly promote cotton budding and flowering, effectively increase the number of buds and bolls per plant, reduce the bud-boll shedding rate, and increase the weight of a single boll. It has a significant promoting effect on cotton bud growth and boll formation, demonstrating excellent practical application results in the field and making it suitable for widespread use in cotton fields.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A humic acid compound liquid fertilizer formula suitable for promoting cotton bud formation, characterized in that, This formula, based on the preparation of 1000 parts by weight of the finished product, consists of the following raw material components in parts by weight: Water 700-750 parts by weight, potassium hydroxide 40-50 parts by weight, potassium dihydrogen phosphate 140-160 parts by weight, urea 80-100 parts by weight, mineral-derived potassium humate 65-75 parts by weight, alkyl glycoside-rhamnolipid composite bio-penetrating agent solution 8-10 parts by weight, polyaspartic acid-γ-aminobutyric acid composite functional solution 10-14 parts by weight, mineral-derived potassium fulvate 15-25 parts by weight, plant-derived composite amino acids 5-10 parts by weight, EDTA chelated micro-fertilizer 3-6 parts by weight, seaweed extract 2-5 parts by weight, polyethylene glycol type wetting and spreading agent 1-3 parts by weight. The EDTA chelated micronutrient fertilizer is composed of EDTA chelated boron, EDTA chelated zinc, and EDTA chelated magnesium in a mass ratio of 2:1.5:

1.

2. The bud-promoting humic acid compound liquid fertilizer formula for cotton according to claim 1, characterized in that, The potassium humate sourced is agricultural powder extracted from weathered coal using an alkali dissolution method. It has a particle size of 80-120 mesh and a loose powder density of 0.35-0.45 g / cm³. 3 The potassium humate is an agricultural powder extracted from lignite by microbial degradation, with a molecular weight of 1000-5000 Da, a carboxyl content ≥8.0 mmol / g, and a phenolic hydroxyl content ≥4.0 mmol / g.

3. The bud-promoting humic acid compound liquid fertilizer formula for cotton according to claim 1, characterized in that, The plant-derived compound amino acid is a water-soluble powder obtained by enzymatic hydrolysis of soybean meal with neutral protease and papain, containing 18 kinds of free L-type amino acids, with an amino acid nitrogen content ≥6%; the effective boron content of the EDTA chelated boron is ≥10%, the effective zinc content of the EDTA chelated zinc is ≥15%, the effective magnesium content of the EDTA chelated magnesium is ≥6%, and the EDTA chelated micro-fertilizer is a water-soluble powder with a water solubility ≥99%.

4. The bud-promoting humic acid compound liquid fertilizer formula for cotton according to claim 1, characterized in that, The seaweed extract is a water-soluble liquid obtained by low-temperature enzymatic hydrolysis of *Alternaria buergeriana* using cellulase and alginate, with a solid content ≥40%; the alkyl glycoside-rhamnolipide composite bio-penetrating agent is a polyether-modified trisiloxane-based organosilicon penetrant, a homogeneous aqueous liquid, with an effective active ingredient content ≥99%; the polyethylene glycol wetting and spreading agent is a water-soluble powder composed of polyethylene glycol 4000 and polyethylene glycol 6000 in a 1:1 mass ratio; the polyaspartic acid-γ-aminobutyric acid composite functional liquid is a homogeneous aqueous liquid preparation containing 28-homobrassinolide, 6-benzylaminopurine, sugar alcohol chelated boron, and sugar alcohol chelated zinc.

5. The bud-promoting humic acid compound liquid fertilizer formula for cotton according to claim 1, characterized in that, The potassium hydroxide is agricultural grade flake potassium hydroxide with a purity ≥90%; the potassium dihydrogen phosphate is agricultural grade crystalline potassium dihydrogen phosphate with a purity ≥98%; the urea is agricultural grade granular urea with a total nitrogen content ≥46% and a biuret content ≤0.9%.

6. A method for preparing a humic acid compound liquid fertilizer suitable for promoting cotton bud formation, wherein the method is applicable to the humic acid compound liquid fertilizer formulation for promoting cotton bud formation as described in any one of claims 1-5, characterized in that, The specific steps of this preparation method are as follows: S1, Preparation of basic mother liquor: Inject the prescribed amount of deionized production water into a closed stirred reaction vessel, turn on the stirring device and adjust it to the set speed, add potassium hydroxide, potassium dihydrogen phosphate and urea in sequence, and stir continuously until all raw materials are completely dissolved to obtain basic nutrient mother liquor. S2, Preparation of mixed nutrient solution: While maintaining the set speed of the stirring device and the sealed environment inside the tank, polyethylene glycol wetting and spreading agent, alkyl glycoside-rhamnolipid composite bio-penetrating agent solution and plant-derived composite amino acids are added to the basic nutrient stock solution in sequence. After continuous stirring, all raw materials are completely dissolved and blended to obtain mixed nutrient solution. S3, Preparation of humic acid mother liquor: Adjust the speed of the stirring device, mix the formulated amount of mineral-derived potassium humate and mineral-derived potassium fulvate evenly, and then add them to the mixed nutrient solution in batches. Stir continuously until the humic acid raw materials are completely dispersed and dissolved to obtain humic acid composite mother liquor. S4, Semi-finished product preparation: Adjust the speed of the stirring device, maintain the sealed environment inside the tank, and add EDTA chelated micro fertilizer, seaweed extract and polyaspartic acid-γ-aminobutyric acid composite functional liquid to the humic acid composite mother liquor in sequence. Stir continuously until all raw materials are completely dissolved and blended to obtain fertilizer semi-finished product. S5, Volume Adjustment and Filling: Detect the actual weight of the fertilizer semi-finished product, add the remaining deionized production water to the tank until the weight is set in the formula, stir and mix thoroughly, take a sample for testing, and after passing the test, transport the fertilizer semi-finished product to the filling equipment to complete the filling. After filling, perform sealing treatment to complete the finished product packaging.

7. The method for preparing the bud-promoting humic acid compound liquid fertilizer for cotton according to claim 6, characterized in that, In step S1, the sealed stirred reaction vessel is made of 304 stainless steel. The initial set speed of the stirring device is 80-100 r / min. Potassium hydroxide is added in 3-4 batches along the edge of the liquid vortex inside the vessel. After each batch is added, stirring is continued for 5-8 minutes. After potassium dihydrogen phosphate is added, stirring is continued for 15-20 minutes. After urea is added, stirring is continued for 10-15 minutes. The entire preparation process is carried out in a normal temperature and pressure environment inside the vessel.

8. The method for preparing the bud-promoting humic acid compound liquid fertilizer for cotton according to claim 6, characterized in that, In step S2, the polyethylene glycol wetting and spreading agent is sieved and sprinkled along the center of the liquid vortex in the tank. After sprinkling, stirring is continued for 8-10 minutes. The alkyl glycoside-rhamnolipide composite bio-penetrating agent solution is injected uniformly along the tank wall through the dripping pipe at a dripping rate of 50-80 mL / min. After injection, stirring is continued for 10-12 minutes. After the plant-derived composite amino acids are added, stirring is continued for 12-15 minutes. In step S3, the stirring speed of the stirring device is increased to 100-120 r / min. The mixture of mineral-derived potassium humate and mineral-derived potassium fulvate is sprinkled along the center of the liquid vortex in the tank in 4-6 batches. After each batch is added, stirring is continued for 8-10 minutes. After all the materials are added, stirring is continued for 25-30 minutes.

9. The method for preparing the bud-promoting humic acid compound liquid fertilizer for cotton according to claim 6, characterized in that, In step S4, the stirring device is rotated at 80-100 r / min. EDTA chelated micro-fertilizer is added along the edge of the liquid vortex inside the tank. After addition, stirring is continued for 10-12 min. Seaweed extract is injected at a constant speed along the tank wall through the dripping pipe at a dripping rate of 30-50 mL / min. After injection, stirring is continued for 12-15 min. Polyaspartic acid-γ-aminobutyric acid composite functional liquid is injected at a constant speed through the dripping pipe at a dripping rate of 40-60 mL / min. After injection, stirring is continued for 15-20 min.

10. The method for preparing the bud-promoting humic acid compound liquid fertilizer for cotton according to claim 6, characterized in that, In step S5, the fertilizer semi-finished product is allowed to stand for 5-10 minutes before being weighed. The replenished deionized production water is slowly injected through the bottom feed pipe at a flow rate of 0.2-0.3 m / s. 3 After water replenishment, the stirring device is adjusted to 80 r / min and stirred continuously for 6-8 min. The qualified fertilizer semi-finished product is transported to the vacuum filling equipment through a sanitary stainless steel conveying pipeline. The vacuum degree of filling is -0.05 to -0.08 MPa, and the filling flow rate is 1-2 L / min. After filling, the product is subjected to double sealing treatment of screw cap sealing and aluminum foil sealing. After sealing, the finished product is labeled with a code.

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