Compound fertilizer for promoting cotton yield and preparation method thereof

Abstract

The application discloses a compound fertilizer for promoting cotton high yield and a preparation method thereof, relates to the technical field of cotton fertilizer, and comprises first mother liquor A, second mother liquor B and third mother liquor C which are prepared, stored and packaged separately; the first mother liquor A contains urea phosphate, monoammonium phosphate, anhydrous citric acid, malic acid and manganese sulfate monohydrate; the second mother liquor B contains commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt type polyaspartic acid solution, purified fulvic acid clear liquid and tri-potassium citrate; and the third mother liquor C is a mixed system of polyol complex state boron clear pre-liquid and medium complex state zinc pre-liquid. The application can improve the effective state stability of phosphorus, zinc and boron, reduce the risks of precipitation fouling and dripping head blockage, alleviate the risks of local salt peak and root injury in the seedling stage, promote the uniform emergence and young root growth of cotton, and improve the yield.

Description

Technical Field

[0001] This invention relates to the field of cotton fertilizer technology, specifically to a compound fertilizer for promoting high cotton yield and its preparation method. Background Technology

[0002] Existing cotton-specific fertilizers and drip irrigation water-soluble fertilizers are mainly improved around the ratio of macroelements, acidic phosphorus sources, polyphosphate or slow-release synergistic components, and microelements such as zinc and boron. This is to meet the production demands of cotton seedlings, which are highly sensitive to phosphorus, zinc, and boron, and the requirement for uniform seedling emergence under subsequent mechanized management. In current applications, one type of product focuses on using acidic water-soluble fertilizers or high-phosphorus starter fertilizers to improve rapid phosphorus supply during the seedling stage. Another type focuses on improving utilization rates through synergists, humic acid substances, or microelement compounding. Some practices also involve supplementing phosphate fertilizer with zinc and boron separately at different stages.

[0003] The above-mentioned pathways are applicable under normal water quality and general fertilization conditions. However, in saline-alkali land and alkaline hard water conditions, fertilization with seedling water is not a simple nutrient replenishment process, but a dynamic chemical process simultaneously affected by bicarbonate, calcium and magnesium ions in the irrigation water, pH of the original solution, local fertilizer concentration, urea or ammonium nitrogen conversion, and the flow channel conditions of the drip irrigation system. If orthophosphate fertilizers come into direct contact with water in a high bicarbonate, high calcium and magnesium environment, precipitation or scaling is likely to occur, leading to a decrease in available phosphorus and inducing a decrease in dripper flow rate. If zinc and boron come into contact with phosphorus sources or organic components in a concentrated state or in a local high-concentration area, unstable complexation, precipitation, or a decrease in available form may also occur. Meanwhile, during the seedling emergence stage, the amount of fertilizer applied is concentrated and the moist body is limited. The fertilizer solution forms a short-term high conductivity and local pH fluctuations near the seed row, which can easily lead to salt damage, ammonia damage, or root tip stimulation. In addition, the drip irrigation moist front has limited reach, and the seedling roots are forced to be distributed in a narrow root zone affected by the dual fluctuations of salt and nutrients. This results in insufficient root penetration, reduced seedling uniformity, and amplifies the problem of uneven population distribution under subsequent drip irrigation under film conditions, thus affecting seedling survival, boll formation, and yield.

[0004] Therefore, the actual technical problems faced by existing technologies are: In the scenario of seedling irrigation and fertilization in cotton fields under saline-alkali mulch, how can we ensure the chemical compatibility and effective stability of cotton compound fertilizer containing phosphorus, zinc, and boron in an irrigation system with high calcium and magnesium content and a slightly alkaline environment? How can we avoid precipitation and scaling, uneven dripper flow, fluctuations in salinity and pH in the sowing zone, and root damage during the seedling stage caused by localized high-concentration fertilization, which could lead to uneven seedling emergence, unstable seedling growth, and limited subsequent yield? Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a compound fertilizer for promoting high cotton yield and its preparation method. The composition includes a first mother liquor A, a second mother liquor B, and a third mother liquor C, which are prepared, stored, and packaged separately. The first mother liquor A contains urea phosphate, monoammonium phosphate, anhydrous citric acid, malic acid, and manganese sulfate monohydrate. The second mother liquor B contains commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt polyaspartic acid solution, purified fulvic acid solution, and tripotassium citrate. The third mother liquor C is a mixture of a clarified pre-mixed solution containing polyol-complexed boron and a moderately complexed zinc pre-mixed solution. This method reduces the risk of precipitation, scaling, and dripper clogging, mitigates localized salt peaks and root damage during the seedling stage, promotes uniform cotton emergence and root development, and solves the technical problems described in the background art.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A compound fertilizer for promoting high cotton yield includes three separately stored mother liquors: a first mother liquor A, a second mother liquor B, and a third mother liquor C. The first mother liquor A contains 32-38% urea phosphate, 6-10% monoammonium phosphate, 2.5-4% anhydrous citric acid, 0.8-1.5% malic acid, and 0.6-1.2% manganese sulfate monohydrate. The second mother liquor B contains 30-36% commercial 11-37-0 liquid ammonium polyphosphate, 3-5% ammonium salt polyaspartic acid solution, 8-12% purified fulvic acid solution, and 1-2.5% tripotassium citrate. The third mother liquor C contains 13-15% anhydrous sorbitol, 2.5-3.5% glycerol, 5-7% boric acid, 3.8-4.8% zinc sulfate heptahydrate, 1.2-1.8% glycine, 0.5-0.9% anhydrous citric acid, and 3.5-4.5% purified fulvic acid solution. The remainder of all three is deionized water or softened water. Furthermore, the first mother liquor A, the second mother liquor B, and the third mother liquor C are all clear liquids. They are prepared, stored, and packaged separately, and are not stored together for a long period of time as a single commercial liquid.

[0007] Furthermore, the mass ratio of anhydrous citric acid to malic acid in the first mother liquor A is 2.0:1-4.0:1, the pH of the first mother liquor A is 1.5-2.2, and the first mother liquor A does not contain ammonium polyphosphate.

[0008] Furthermore, in the product 11-37-0 liquid ammonium polyphosphate, the proportion of polyphosphate to total phosphorus is 60%-75%, the weight average molecular weight of ammonium salt polyaspartic acid is 1500-4000, the solid content of the purified humic acid solution is 45%-55%, the water-insoluble matter is not higher than 0.5%, the sodium content is not higher than 0.3%, and the second mother liquor B does not contain zinc source or boron source, and does not introduce urea phosphate or monoammonium phosphate. The molar ratio of boric acid, anhydrous sorbitol, and glycerol is 1:(0.8-1.0):(0.25-0.40), and the molar ratio of zinc ions, glycine, and anhydrous citric acid is 1:(1.2-1.6):(0.2-0.4). The third mother liquor C is a mixed system containing polyol-complexed boron clarified pre-prepared solution and moderately complexed zinc pre-prepared solution. It does not crystallize after standing for 24 hours, and the third mother liquor C does not contain borax, sodium octaborate tetrahydrate, ethanolamine, sodium pyrophosphate, zinc ethylenediaminetetraacetate, or zinc ethylenediaminedi-o-hydroxyphenylacetate.

[0009] A method for preparing a compound fertilizer to promote high cotton yield involves sequentially adding anhydrous citric acid, malic acid, urea phosphate, monoammonium phosphate, and manganese sulfate monohydrate to water to obtain a first mother liquor A; sequentially adding commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt polyaspartic acid solution, purified fulvic acid solution, and tripotassium citrate to water to obtain a second mother liquor B; firstly preparing a clarified pre-mixed solution containing polyol-complexed boron from anhydrous sorbitol, glycerol, and boric acid; then preparing a medium-complexed zinc pre-mixed solution from glycine, anhydrous citric acid, zinc sulfate heptahydrate, and purified fulvic acid solution; and finally adding the zinc pre-mixed solution to the clarified pre-mixed solution containing polyol-complexed boron to obtain a third mother liquor C.

[0010] Furthermore, when preparing the first mother liquor A, 40 kg of deionized water was added to an acid-resistant stirred reactor, the temperature was raised to 30-35 degrees Celsius, anhydrous citric acid and malic acid were added in sequence, and the mixture was stirred until completely dissolved. Urea phosphate was added in batches, and the temperature inside the reactor was controlled not to exceed 45 degrees Celsius. After the system became clear, monoammonium phosphate was added, followed by manganese sulfate monohydrate. The remaining deionized water was added to bring the total weight to 100 kg. The mixture was then filtered through a 120-mesh filter and bottled.

[0011] Furthermore, when preparing the second mother liquor B, commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt polyaspartic acid solution, purified fulvic acid solution and tripotassium citrate are added sequentially to 35 kg of deionized water at 25-35 degrees Celsius. After the tripotassium citrate is completely dissolved, water is added to bring the volume to 100 kg. The solution is then filtered through a 120-mesh filter and bottled.

[0012] Furthermore, in preparing the third mother liquor C, anhydrous sorbitol and glycerol are first dissolved in 25 kg of deionized water at 55-60 degrees Celsius. Boric acid is then added, and the temperature is raised to 75-85 degrees Celsius and kept at this temperature for 1.5-2.5 hours to obtain a clear pre-mixed solution containing polyol-complexed boron. Separately, glycine and anhydrous citric acid are dissolved in 20 kg of deionized water at 35-45 degrees Celsius. Zinc sulfate heptahydrate and purified fulvic acid solution are then added to obtain a medium-complexed zinc pre-mixed solution. The zinc pre-mixed solution is added to the clear pre-mixed solution containing polyol-complexed boron, and the remaining deionized water is added to bring the total weight to 100 kg. The solution is then filtered through a 120-mesh filter and bottled.

[0013] Furthermore, the zinc premixed solution is added to the clarified premixed solution containing polyol complexed boron over 15-25 minutes, and stirring is continued for 30-40 minutes after the addition is complete.

[0014] (III) Beneficial Effects This invention provides a compound fertilizer for promoting high cotton yield and its preparation method, which has the following beneficial effects: For the specific scenario of post-sowing emergence water in drip-irrigated cotton fields under saline-alkali mulch, the compound fertilizer was designed as a first, second, and third mother liquor, prepared, stored, and applied sequentially. This transformed the fertilization process from a simple mixing to a phased establishment of a chemical environment. The synergistic effect of urea phosphate, monoammonium phosphate, citric acid, malic acid, and manganese sulfate monohydrate in the first mother liquor allows for the formation of an acidification window to promote seedling growth when it enters a slightly alkaline irrigation system with high calcium and magnesium content. This reduces the tendency for carbonate and phosphate deposition, stabilizes readily available phosphorus during the seedling stage, and mitigates the risk of localized high salt and ammonia damage.

[0015] The second mother liquor, containing liquid ammonium polyphosphate, polyaspartic acid, low-sodium humic acid concentrate, and potassium citrate, continues to provide a phosphorus source beyond the previously mentioned window, while inhibiting calcium salt crystal growth and reducing dripper flow rate attenuation and nutrient instability within the moistened body. The third mother liquor, with its pre-complexed system of boric acid, sorbitol, and glycerol, and its pre-compounded system of zinc salt, glycine, citric acid, and humic acid, avoids precipitation and inactivation caused by direct contact between zinc / boron and phosphorus sources in concentrated states and localized high-concentration areas, thus maintaining higher availability of zinc and boron within the seedling emergence zone. These three mother liquors are not simply superimposed; rather, under sequential application and irrigated transition conditions, they form a continuous synergistic effect, simultaneously promoting seedling growth, stabilizing phosphorus, preventing clogging, mitigating seedling damage, and promoting root development. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall application architecture of the three-component compound fertilizer of the present invention in a drip irrigation scenario under film. Figure 2 This is a block diagram illustrating the functional division and synergistic relationship of the three-component compound fertilizer composition of the present invention; Figure 3This is a schematic diagram of the separate preparation process of component A and component B in this invention; Figure 4 This is a schematic diagram of the preparation process of the dual pre-mixed compound of component C of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-4 This invention provides a compound fertilizer for promoting high cotton yield and its preparation method, comprising: Unless otherwise specified, all percentages listed in this instruction manual are by mass and are based on the actual mass of each raw material added; the specifications of the liquid raw materials are indicated separately in the corresponding entries.

[0019] Composition and parameter range of each component unit 1. Component A: Acidification and seedling-promoting orthophosphate unit

[0020] Based on the total mass of component A, component A includes: Component A1: Urea phosphate, 32%-38%; Component A2: Monoammonium phosphate, 6%-10%; Component A3: Anhydrous citric acid, 2.5%-4.0%; Component A4: Malic acid, 0.8%-1.5%; Component A5: Manganese sulfate monohydrate, 0.6%-1.2%, equivalent to 0.18%-0.40% manganese element; Component A6: Deionized water or softened water, to a total of 100%.

[0021] Preferably, manganese sulfate monohydrate is an industrial-grade or fertilizer-grade raw material; the mass ratio of anhydrous citric acid to malic acid is 2.0:1-4.0:1; phosphorus in component A is mainly in the form of orthophosphate, and no ammonium polyphosphate is introduced; the pH of component A is 1.5-2.2, the density is 1.35-1.45 g / mL, the total nitrogen mass fraction is 6%-10%, and the phosphorus pentoxide mass fraction is 18%-27%.

[0022] 2. Component B: Polyphosphorus scale inhibitor extended effect unit

[0023] Based on the total mass of component B, component B includes: Component B1: Commercial 11-37-0 liquid ammonium polyphosphate, 30%-36%; Component B2: Ammonium salt type polyaspartic acid solution, 3%-5% (based on commercial solution with 35% active content); Component B3: Purified fulvic acid solution, 8%-12% (based on commercial solution with 50% solid content); Component B4: Tripotassium citrate, 1.0%-2.5%; Component B5: Deionized water or softened water, to a total of 100%.

[0024] Preferably, the proportion of polyphosphate in the total phosphorus of the 11-37-0 liquid ammonium polyphosphate is not less than 60%, preferably 60%-75%; the weight average molecular weight of the ammonium salt type polyaspartic acid is 1500-4000; the purified fulvic acid solution has a solid content of 45%-55%, a water-insoluble matter content of not more than 0.5%, a sodium content of not more than 0.3%, and a pH of 3.5-6.5; the pH of component B is 5.0-6.2, and the density is 1.15-1.30 g / mL; component B does not contain zinc or boron sources, and does not introduce urea phosphate or monoammonium phosphate.

[0025] 3. Component C: Sodium-free buffered boron-medium complexed zinc unit

[0026] Based on the total mass of component C, component C includes: Component C1: Anhydrous sorbitol, 13%-15%; Component C2: Glycerol, 2.5%-3.5%; Component C3: Boric acid, 5.0%-7.0%; Component C4: Zinc sulfate heptahydrate, 3.8%-4.8%, equivalent to approximately 0.85%-1.10% elemental zinc; Component C5: Glycine, 1.2%-1.8%; Component C6: Anhydrous citric acid, 0.5%-0.9%; Component C7: Purified fulvic acid solution, 3.5%-4.5% (based on a 50% solids content commercial solution); Component C8: Deionized water or softened water, to a final volume of 100%.

[0027] Preferably, the zinc salt is zinc sulfate heptahydrate; the molar ratio of boric acid, sorbitol, and glycerol is 1:(0.8-1.0):(0.25-0.40); the molar ratio of zinc ions, glycine, and anhydrous citric acid is 1:(1.2-1.6):(0.2-0.4); the mass ratio of fulvic acid solids to zinc element is 1.0:1-3.5:1; and the pH of component C is 3.5-4.8. Preferably, component C is a mixture of a pre-mixed solution containing polyol-complexed boron and a pre-mixed solution containing moderately complexed zinc, prepared by heat treatment at 75-85 degrees Celsius, which does not crystallize after standing for 24 hours. Preferably, component C does not contain borax, sodium octaborate tetrahydrate, ethanolamine, sodium pyrophosphate, zinc ethylenediaminetetraacetate, or zinc ethylenediaminedi-o-hydroxyphenylacetate.

[0028] All three component units are clear liquid type and do not use suspension fillers such as bentonite and carboxymethyl cellulose; potassium chloride is not used as potassium source in the three-component compound fertilizer composition; borax, sodium octaborate tetrahydrate, sodium pyrophosphate, and sodium bentonite are not used in the three-component compound fertilizer composition; zinc source does not include zinc ethylenediaminetetraacetate and zinc ethylenediamine di-o-hydroxyphenylacetate; component A does not contain ammonium polyphosphate, component B does not contain urea phosphate and monoammonium phosphate, and component C does not contain phosphorus source.

[0029] This solution is a three-component compound fertilizer composition consisting of a first mother liquor A, a second mother liquor B, and a third mother liquor C. The three are prepared, stored, and packaged separately. When used, they are injected into the drip irrigation system in the prescribed order. It is not required that the three be stored together as a single commercial liquid for a long period of time.

[0030] Example 1 1. Formulation of component A

[0031] Based on 100 kg: 34.0 kg urea phosphate, 8.0 kg monoammonium phosphate, 3.2 kg anhydrous citric acid, 1.1 kg malic acid, 0.9 kg manganese sulfate monohydrate, and 52.8 kg deionized water; the resulting component A is a clear to light yellow liquid with a pH of 1.7-2.1; the manganese content is approximately 0.29%.

[0032] 2. Formulation of component B

[0033] Based on 100 kg: 34.0 kg of commercial product 11-37-0 liquid ammonium polyphosphate (polyphosphate accounts for no less than 65% of total phosphorus), 4.0 kg of ammonium salt type polyaspartic acid solution (active content 35%), 10.0 kg of purified humic acid clear liquid (solid content 50%, water insoluble matter no more than 0.5%, sodium content no more than 0.3%), 2.0 kg of tripotassium citrate, and 50.0 kg of deionized water. The resulting component B is a brownish-yellow clear liquid with a pH of 5.2-6.0.

[0034] 3. Formulation of component C

[0035] Based on 100 kg: 14.2 kg anhydrous sorbitol, 3.0 kg glycerol, 6.0 kg boric acid, 4.4 kg zinc sulfate heptahydrate, 1.6 kg glycine, 0.8 kg anhydrous citric acid, 4.0 kg purified humic acid solution (50% solids, no more than 0.5% water-insoluble matter, no more than 0.3% sodium content), and 66.0 kg deionized water. The resulting component C is a light brown to brownish-yellow clear liquid with a pH of 3.8-4.6, and does not crystallize after standing for 24 hours; the boron content is approximately 1.05%, and the zinc content is approximately 1.0%.

[0036] Detailed preparation method of Example 1 1. Preparation of component A

[0037] Add 40 kg of deionized water to an acid-resistant stirred reactor, start stirring, and control the speed at 250-350 rpm, raising the temperature to 30-35°C. First, add anhydrous citric acid and malic acid, stirring until completely dissolved. Then, add urea phosphate in batches, with an interval of 2-5 minutes between each batch, controlling the temperature inside the reactor to not exceed 45°C. After the system becomes clear, slowly add monoammonium phosphate, continuing to stir for 20-30 minutes. Finally, add manganese sulfate monohydrate, stirring for 30 minutes. Add the remaining deionized water to a final volume of 100 kg, filter through a 120-mesh sieve, and bottle to obtain component A.

[0038] The order of adding ingredients should be kept consistent; if monoammonium phosphate is added first and then organic acid is added, the local dissolution rate may decrease; if manganese salt is added too early, its stability is not as good as that of adding it later before an acid window is formed.

[0039] 2. Preparation of component B

[0040] Add approximately 35 kg of deionized water to the reactor, start stirring, and control the temperature at 25-35 degrees Celsius. Add commercial 11-37-0 liquid ammonium polyphosphate and stir for 15-20 minutes. Then add ammonium salt polyaspartic acid solution and stir for 10-15 minutes. Subsequently, add purified fulvic acid solution and continue stirring for 20 minutes. Finally, add tripotassium citrate, and after complete dissolution, add water to a final volume of 100 kg. Filter through a 120-mesh sieve and bottle to obtain component B.

[0041] Component B does not contain zinc salts, boric acid, or other trace metal salts. This is not only for ease of operation, but also to avoid increasing the risk of precipitation by long-term coexistence of trace metals with the polyphosphoric acid system in a concentrated state.

[0042] 3. Preparation of component C

[0043] First, prepare a pre-mixed solution containing boron complexed with polyol. Add 25 kg of deionized water, anhydrous sorbitol, and glycerol to the first reaction vessel, heat to 55-60°C, and stir until completely homogeneous. Then, slowly add boric acid, raise the temperature to 75-85°C, and maintain the temperature for 1.5-2.5 hours until a clear and homogeneous pre-mixed solution is formed that does not crystallize after standing for 24 hours. Cool to 35-40°C for later use.

[0044] Next, prepare a zinc pre-mixed solution with intermediate complexation. Add 20 kg of deionized water, glycine, and anhydrous citric acid to the second reaction vessel, and stir at 35-45°C until dissolved. Then, slowly add zinc sulfate heptahydrate, maintaining a temperature of 40-50°C and stirring for 30-40 minutes. Subsequently, add purified fulvic acid solution and continue stirring for 30-60 minutes to obtain a homogeneous zinc pre-mixed solution. Cool to 35-40°C for later use.

[0045] Finally, the zinc pre-mixed solution was slowly added to the pre-mixed solution containing polyol-complexed boron, with the addition time controlled at 15-25 minutes, while maintaining stirring during the addition process. After the addition was complete, the mixture was stirred for another 30-40 minutes, and the remaining deionized water was added to bring the total weight to 100 kg. After filtration through a 120-mesh filter, the mixture was bottled to obtain component C.

[0046] The preferred application method is: Component A: 3.0-4.0 kg / mu, Component B: 0.8-1.2 kg / mu, and Component C: 0.8-1.2 kg / mu; It is preferred to use the first irrigation water after sowing, with a total volume of 12-18 cubic meters per mu. The suitable irrigation water has a pH of 7.6-8.6, a bicarbonate content of 3-6 mmol / L, a calcium content of 60-150 mg / L, and a magnesium content of 15-50 mg / L.

[0047] A preferred fertilization sequence is as follows: First, pre-wet 4-6 cubic meters / acre with clean water, then inject component A into the subsequent 4-6 cubic meters / acre fertilization section. Component B should be injected immediately after component A and overlap with component A for 10%-30% of the time. Component C should be injected in the subsequent 2-4 cubic meters / acre of water. Finally, flush the pipeline with 1-2 cubic meters / acre of clean water. If there is only one fertilization tank on site, it is not recommended to store the undiluted solutions of components A, B, and C together for a long period of time; components B and C should be pre-diluted with at least 5 times the amount of water and prepared and used immediately on the same day.

[0048] 1. Application Scenarios

[0049] The scenario is set as follows: mild to moderate saline-alkali land, mulched with plastic film, drip irrigation under the film, and the first irrigation and fertilization after seedling emergence. The preferred irrigation water conditions are: pH 7.6-8.6, bicarbonate 3-6 mmol / L, calcium ion 60-150 mg / L, and magnesium ion 15-50 mg / L.

[0050] The irrigation water settings for the model are as follows:

[0051] 2. Fertilizer application rate and the principle of equal nutrient content

[0052] In Example 1 of this application, the following dosage per acre is applied:

[0053] The average nutrient load, converted to the total 15 m³ / mu of seedling water, is approximately:

[0054] Except for the blank control, all other fertilization groups were converted to the same input amount per acre according to the principles of equal nitrogen, equal available phosphorus pentoxide, equal zinc, and equal boron. The only changes were in their chemical form, whether they were grouped or divided into units, whether they were pre-mixed, and whether they contained manganese anti-scaling window.

[0055] Component A is preferably injected in the subsequent 4-6 m³ / mu fertilization section, Component B is injected immediately after Component A and has a 10%-30% time overlap with Component A, Component C is injected in the subsequent 2-4 m³ / mu of water, and finally the pipeline is flushed with 1-2 m³ / mu of clean water; the total nitrogen, available phosphorus pentoxide, zinc, and boron in the table above are average loads calculated based on a total of 15 m³ / mu, and are not used as limiting values ​​for online pH and online concentration in the fertilization section.

[0056] Table of Test Items and Standards

[0057] The following testing standards correspond to fertilizer concentrate, online sample solution for fertilizer injection, or field sample, respectively, according to the nature of the sample.

[0058] Processing settings The following is a set of 6 groups: 1 group representing the present application and 5 groups representing references.

[0059]

[0060] Example 1: Detection values ​​of the sample Table 1. Physicochemical properties of each component unit in Example 1 of this application.

[0061]

[0062] The following results are representative of the water quality and experimental conditions described above, and are used to illustrate the relative differences between different treatments. They should be interpreted in conjunction with the specific experimental conditions.

[0063] Among them: Component A maintains a strong acid window and provides an online concentration of approximately 1.7-2.6 mg / L of Mn²⁺ during the fertilization stage; Component B maintains a weak acid near-neutral window; Component C is within the range where trace elements are relatively stable and do not crystallize after 24 hours of standing.

[0064] Experiment Example 1: Hard Water Compatibility and Sedimentation Stability Test Test methods

[0065] Using the above-mentioned model irrigation water, online representative sample solutions corresponding to the fertilization segment were prepared in the laboratory according to each treatment, and allowed to stand for 4 hours and 24 hours respectively.

[0066] The average nutrient load of the working solution was calculated at 15 m³ / mu. The pH and newly added suspended solids in Table 2 are representative online sample solution data from the fertilization period and do not represent the average pH of the entire emergence water. The retention rates of dissolved P, Zn, and B were determined after the online sample solution was filtered through a 0.45 μm filter membrane. The pH of the working solution was determined according to GB / T6920-1986, the newly added suspended solids according to GB / T11901-1989, the dissolved P according to HJ670-2013, and the dissolved Zn and B according to HJ776-2015.

[0067] Table 2 Online compatibility of fertilizer injection segment and retention rate of dissolved state of 0.45μm filtrate

[0068]

[0069] CK3 has demonstrated that acidification itself is indeed helpful: in the online sample solution during the fertilizer injection phase, the pH decreased from 7.26 to 5.58, the newly added suspended solids decreased from 146 mg / L to 86 mg / L, and the 4-hour dissolved phosphorus retention rate increased from 68.7% to 84.1%. However, its results are still significantly inferior to E1, indicating that simply acidifying the orthophosphate system is insufficient to simultaneously solve the problems of sustained phosphorus supply, zinc-boron stability, and system compatibility.

[0070] CK4 represents a simple juxtaposition of known elements from existing technologies into a single-cylinder system. While its zinc retention rate is already quite high, its phosphorus retention rate and the amount of newly added suspended matter are both unsatisfactory, indicating that a simple juxtaposition cannot recreate the synergistic effect of this application.

[0071] CK5 is very close to this application, lacking only two key aspects: A lacks a manganese anti-scaling window, and C lacks a pre-compounded buffer system. Its 4-hour dissolved phosphorus retention rate and zinc retention rate are 5.1 percentage points and 11.9 percentage points lower than E1, respectively, indicating that the "manganese + pre-compounded zinc-boron unit" in this application has a substantial impact on the stability of the working fluid.

[0072] Experiment Example 2: Drip Irrigator Clog Test Test methods

[0073] Following the dripper flow test framework of GB / T17187-2009, drippers with a rated flow rate of 2.0 L / h were used, with 6 parallel circulation lines, 40 drippers per line, and an inlet pressure of 100 kPa, for a cumulative run of 72 hours. Clogging was evaluated based on the average flow rate, relative flow retention rate, and flow coefficient of variation at the end of the test; the clogging rate was defined as the percentage of drippers whose flow rate was below 75% of the rated flow rate after 72 hours out of the total number of drippers.

[0074] Table 3. Drip head flow rate, relative flow retention rate, and clogging results

[0075]

[0076] CK2 indicates that while the raw materials for conventional single-cylinder start-up fertilizer systems are common, they are not conducive to maintaining dripper flow rates under alkaline and hard water conditions. CK3 indicates that "acidification" can significantly improve clogging, but the improvement is still limited. CK4 indicates that adding ammonium polyphosphate, polyaspartic acid, fulvic acid, and zinc boron to the same system does not naturally result in better flow rate maintenance.

[0077] CK5 is very close to this application, but E1 still has a higher relative flow retention rate by 2.9 percentage points, and the clogging rate is further reduced from 5.8% to 3.3%. E1 also achieves lower new suspended solids, higher phosphorus retention rate and better dripper flow retention, realizing simultaneous optimization of multiple indicators.

[0078] Experiment Example 3: Cotton Emergence and Seedling Growth Experiment under Saline-Alkaline Substrate Conditions Test methods

[0079] Indoor potted / seedling simulation was performed, with four replicates and 100 cotton seeds per replicate. Relevant percentage indicators are expressed as the average of each replicate. The basic conditions for germination testing were in accordance with the counting and judgment principles of GB / T3543.4-2025; the pH of the 1:5 extract of the seed strip was determined according to HJ962-2018, and the conductivity was determined according to HJ802-2016.

[0080] The evaluation indicators are: germination vigor, emergence rate, seedling height, taproot length, above-ground dry weight, root dry weight, and seedling uniformity.

[0081] Table 4. Emergence and Seedling Indicators

[0082]

[0083] Under the conditions of this experiment, the comparison between CK2 and CK3 shows that acidification can indeed improve the environment of the sowing strip: the pH decreases and the emergence rate and root length are both improved.

[0084] However, compared to CK3, E1 further increased the main root length from 14.1cm to 16.4cm and the root dry weight from 0.104g / plant to 0.123g / plant. Moreover, it had the lowest coefficient of variation in seedling height, indicating that the effect of E1 was not just "a little more acidic", but that the seedlings were more uniform, the roots were deeper, and the root quantity was more abundant.

[0085] CK4 did not reproduce the overall effect of E1, which indicates that this application is not simply a list of known components and a pile of them together.

[0086] Finally, CK5 is the strongest approximation of this application. CK5 has adopted a unit-based approach, but it lacks a manganese anti-fouling window and does not incorporate zinc and boron into a pre-composite buffer system.

[0087] The results showed that the germination rate was 4.6 percentage points lower than that of E1; the taproot length was 1.4 cm shorter than that of E1; the root dry weight was 0.012 g / plant lower than that of E1; and the uniformity of seedlings was significantly worse than that of E1.

[0088] Conclusion: Under the conditions of this experiment, there is a clear functional correspondence between the distinguishing technical features of this application and the effects of promoting seedling growth, slowing salt peak, stabilizing phosphorus, and stabilizing zinc and boron.

[0089] Experiment Example 4: Field Verification Experiment Test methods

[0090] Following the field trial design principles of NY / T3552-2020, a randomized block design was used with a plot area of ​​40 m² and three replicates. All indicators are expressed as the mean of the three replicates. Except for the emergence water treatment, all other parameters—seeding rate, land preparation, mulching, drip irrigation, basal fertilizer, and mid-to-late-stage topdressing—were kept consistent. The observed indicators were: seedling survival rate, number of bolls per plant, boll weight, seed cotton yield, and lint percentage.

[0091] Table 5 Field Results of the Plot

[0092]

[0093] Under the conditions of this plot, compared with CK2, E1 seed cotton yield increased by 10.4%; compared with CK3, E1 seed cotton yield increased by 7.4%; compared with CK4, E1 seed cotton yield increased by 8.8%; and compared with the closest control, CK5, E1 still increased by 5.1%. The improvement for CK5 is particularly valuable because CK5 is no longer a low-level control; it has adopted a "unit-based application" approach, but it lacks two key differentiators found in this application: first, the manganese anti-fouling window in A; and second, the zinc-boron pre-compounded buffer system in C.

[0094] If these differences are merely routine optimizations, the field results typically do not widen to around 5%, indicating that they have resulted in a simultaneous increase in seedling survival rate, boll number, and final yield.

[0095] Comprehensive analysis conclusions Under the aforementioned model and plot test conditions, E1 exhibited the highest retention rates of dissolved phosphorus, zinc, and boron. Regarding system stability, E1 showed the lowest increase in suspended solids and the highest retention rate of the dripper's relative flow rate. In terms of seedling safety, E1 had the lowest pH and EC at the sowing zone among the fertilization groups, and the best seedling uniformity. In terms of crop growth, E1 had the highest emergence rate, taproot length, root dry weight, and yield. Comparative analysis shows that: CK3 demonstrates that simple acidification is insufficient; CK4 demonstrates that directly combining known components such as urea phosphate, ammonium polyphosphate, polyaspartic acid, fulvic acid, zinc, and boron is also insufficient; CK5 demonstrates that even considering the "unit-based" approach, without the key pre-compounding and manganese window of this application, the same comprehensive effect cannot be achieved. Therefore, in the experimental scenario, this application achieves a synergistic effect of a phased chemical window + anti-scaling window + zinc-boron buffer window.

[0096] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A compound fertilizer for promoting high cotton yield, characterized in that: include, The first mother liquor A, the second mother liquor B, and the third mother liquor C are stored separately. The first mother liquor A contains 32-38% urea phosphate, 6-10% monoammonium phosphate, 2.5-4% anhydrous citric acid, 0.8-1.5% malic acid, and 0.6-1.2% manganese sulfate monohydrate. The second mother liquor B contains 30-36% commercial 11-37-0 liquid ammonium polyphosphate, 3-5% ammonium salt polyaspartic acid solution, 8-12% purified fulvic acid solution, and 1-2.5% tripotassium citrate. The third mother liquor C contains 13-15% anhydrous sorbitol, 2.5-3.5% glycerol, 5-7% boric acid, 3.8-4.8% zinc sulfate heptahydrate, 1.2-1.8% glycine, 0.5-0.9% anhydrous citric acid, and 3.5-4.5% purified fulvic acid solution. The remainder of all three is deionized water or softened water.

2. The compound fertilizer for promoting high cotton yield according to claim 1, characterized in that: The first mother liquor A, the second mother liquor B, and the third mother liquor C are all clear liquids. They are prepared, stored, and packaged separately, and are not stored together for a long period of time as a single commercial liquid.

3. The compound fertilizer for promoting high cotton yield according to claim 1, characterized in that: The mass ratio of anhydrous citric acid to malic acid in the first mother liquor A is 2.0:1-4.0:1, the pH of the first mother liquor A is 1.5-2.2, and the first mother liquor A does not contain ammonium polyphosphate.

4. The compound fertilizer for promoting high cotton yield according to claim 1, characterized in that: In product 11-37-0 liquid ammonium polyphosphate, the proportion of polyphosphate to total phosphorus is 60%-75%, the weight average molecular weight of ammonium salt polyaspartic acid is 1500-4000, the solid content of purified humic acid solution is 45%-55%, the water insoluble matter is not higher than 0.5%, the sodium content is not higher than 0.3%, and the second mother liquor B does not contain zinc source or boron source, and does not introduce urea phosphate or monoammonium phosphate.

5. The compound fertilizer for promoting high cotton yield according to claim 1, characterized in that: The molar ratio of boric acid, anhydrous sorbitol, and glycerol is 1:(0.8-1.0):(0.25-0.40), and the molar ratio of zinc ions, glycine, and anhydrous citric acid is 1:(1.2-1.6):(0.2-0.4). The third mother liquor C is a mixed system containing polyol-complexed boron clarified pre-prepared solution and moderately complexed zinc pre-prepared solution. It does not crystallize after standing for 24 hours, and the third mother liquor C does not contain borax, sodium octaborate tetrahydrate, ethanolamine, sodium pyrophosphate, zinc ethylenediaminetetraacetate, or zinc ethylenediaminedi-o-hydroxyphenylacetate.

6. A method for preparing a compound fertilizer to promote high cotton yield, characterized in that: Anhydrous citric acid, malic acid, urea phosphate, monoammonium phosphate, and manganese sulfate monohydrate were added sequentially to water to prepare the first mother liquor A. Commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt polyaspartic acid solution, purified fulvic acid solution, and tripotassium citrate were added sequentially to water to prepare the second mother liquor B. Anhydrous sorbitol, glycerol, and boric acid were first used to prepare a clarified pre-prepared solution containing polyol-complexed boron. Then, glycine, anhydrous citric acid, zinc sulfate heptahydrate, and purified fulvic acid solution were used to prepare a medium-complexed zinc pre-prepared solution. The zinc pre-prepared solution was then added to the clarified pre-prepared solution containing polyol-complexed boron to prepare the third mother liquor C.

7. The preparation method according to claim 6, characterized in that: When preparing the first mother liquor A, 40 kg of deionized water was added to an acid-resistant stirred reactor, the temperature was raised to 30-35 degrees Celsius, anhydrous citric acid and malic acid were added in sequence, and the mixture was stirred until completely dissolved. Urea phosphate was added in batches, and the temperature inside the reactor was controlled not to exceed 45 degrees Celsius. After the system became clear, monoammonium phosphate was added, followed by manganese sulfate monohydrate. The remaining deionized water was added to bring the total weight to 100 kg. The mixture was then filtered through a 120-mesh filter and bottled.

8. The preparation method according to claim 7, characterized in that: When preparing the second mother liquor B, add commercial 11-37-0 liquid ammonium polyphosphate, ammonium salt polyaspartic acid solution, purified fulvic acid solution and tripotassium citrate to 35 kg of deionized water at 25-35 degrees Celsius. After the tripotassium citrate is completely dissolved, add water to bring the volume to 100 kg. After filtration through a 120-mesh filter, it is then bottled.

9. The preparation method according to claim 8, characterized in that: To prepare the third mother liquor C, anhydrous sorbitol and glycerol were first dissolved in 25 kg of deionized water at 55-60 degrees Celsius. Boric acid was then added, and the temperature was raised to 75-85 degrees Celsius and kept at this temperature for 1.5-2.5 hours to obtain a clear pre-mixed solution containing polyol-complexed boron. Separately, glycine and anhydrous citric acid were dissolved in 20 kg of deionized water at 35-45 degrees Celsius. Zinc sulfate heptahydrate and purified humic acid solution were then added to obtain a medium-complexed zinc pre-mixed solution. The zinc pre-mixed solution was added to the clear pre-mixed solution containing polyol-complexed boron, and the remaining deionized water was added to bring the total weight to 100 kg. The solution was then filtered through a 120-mesh filter and bottled.

10. The preparation method according to claim 9, characterized in that: The zinc premixed solution is added to the clarified premixed solution containing polyol complexed boron over 15-25 minutes, and stirring is continued for 30-40 minutes after the addition is complete.

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