Preparation method of carbon-nitrogen-phosphorus synergistic organic water-soluble fertilizer and application thereof on tomatoes

Abstract

This invention relates to the field of agricultural chemistry, and particularly to a method for preparing an organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects, and its application in tomatoes. The organic water-soluble fertilizer uses fulvic acid and humic acid as a composite carbon source, ammonium polyphosphate and urea ammonium nitrate solution as nitrogen and phosphorus sources, and DMPP and NBPT in a 1:1 ratio as nitrogen fertilizer synergists. It is combined with chelated trace elements and polyaspartic acid synergists. Through optimized formulation design and staged dilution application, the nitrogen-to-phosphorus ratio is precisely controlled to 1:2 during the tomato seedling to flowering stage and 1:0.5 during the fruiting stage. The preparation process employs a graded dissolution-ultrasonic dispersion-precise pH control process to ensure fertilizer suspension stability >98% and no crystal precipitation. Application results show that: high phosphorus ratio from seedling stage to flowering stage promotes root development and flower bud differentiation in tomatoes, increasing the flower bud differentiation rate by 18%-22%; low phosphorus ratio during fruiting stage reduces phosphorus fixation, increasing soil phosphorus bioavailability by 42%-47%; and tomato nitrogen utilization rate reaches 59%-63%, achieving precise matching of nutrient supply and demand and simultaneous improvement of soil fertility throughout the entire growth period of tomatoes.

Description

Technical Field

[0001] This invention relates to the field of agricultural chemistry, and in particular to a method for preparing organic water-soluble fertilizer with synergistic effects of carbon, nitrogen and phosphorus, and its application on tomatoes, especially suitable for segmented drip irrigation fertilization systems for tomatoes throughout their entire growth period in facility agriculture. Background Technology

[0002] The nitrogen and phosphorus requirements of tomatoes vary significantly at different growth stages: phosphorus requirements are high from the seedling stage to the flowering stage, as phosphorus is a key element for root development and flower bud differentiation; nitrogen requirements increase relatively and phosphorus requirements decrease during the fruiting stage, as excessive phosphorus is easily bound and fixed with soil ions, leading to fertilizer waste and soil compaction.

[0003] However, traditional water-soluble fertilizers generally use a fixed nitrogen-to-phosphorus ratio formula, which cannot meet the segmented nutrient requirements of tomatoes. For example, the nitrogen-to-phosphorus ratio of humic acid water-soluble fertilizer CN113105281A is fixed at 3:1. Insufficient phosphorus supply during the seedling to flowering period leads to poor flower bud differentiation. For example, the seaweed acid water-soluble fertilizer CN118108553A did not achieve segmented regulation, resulting in excessive phosphorus during the fruiting period, with a phosphorus fixation rate exceeding 50%. Simultaneously, the existing fertilizers have an unbalanced carbon-to-nitrogen ratio (mostly below 10:1), making it difficult to activate soil nitrogen-fixing microorganisms and leading to significant nitrogen loss. Furthermore, the insufficient optimization of the ratio and molecular weight synergy between fulvic acid and humic acid results in a mismatch between carbon source supply and tomato demand, further restricting the improvement of tomato yield and quality. To address this, a method for preparing organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects was designed and its application on tomatoes was proposed. This method aims to solve the problems of traditional organic water-soluble fertilizers having a fixed nitrogen-to-phosphorus ratio, which cannot meet the segmented phosphorus requirements of tomatoes from seedling to flowering stage and from fruiting stage to low phosphorus stage, as well as the problems of soil nitrogen retention capacity, severe phosphorus fixation, low flower bud differentiation rate, and poor fruit development caused by carbon-nitrogen imbalance. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for preparing organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects and its application on tomatoes to address the above-mentioned technical problems. This is to solve the problems that traditional organic water-soluble fertilizers cannot meet the segmented needs of tomatoes from seedling to flowering stage (high phosphorus) and fruiting stage (low phosphorus), as well as the technical problems caused by carbon-nitrogen imbalance, such as weak soil nitrogen retention capacity, severe phosphorus fixation, low flower bud differentiation rate, and poor fruit development.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A water-soluble organic fertilizer with synergistic carbon, nitrogen, and phosphorus effects, characterized by the following formulation: The composition consists of 25%-32% fulvic acid, 18%-25% humic acid, 15%-20% ammonium polyphosphate, 8%-12% urea ammonium nitrate solution, 0.8%-1.2% nitration inhibitor and urease inhibitor compound, 0.9%-1.5% chelated trace elements, 0.2%-0.4% polyaspartic acid, and the balance being deionized water.

[0006] Preferably, the fertilizer has a pH value of 5.8-6.2 and a total carbon-nitrogen-phosphorus mass ratio (C:N:P) of 25:1:1.2-1.5. By adjusting the material ratio of nitrogen and phosphorus sources, the nitrogen-phosphorus ratio (N:P) can be 1:2 from the seedling stage to the flowering stage and 1:0.5 during the fruiting stage, so that the nitrogen and phosphorus supply ratio is coordinated with the crop's needs. The mass ratio of fulvic acid to humic acid is 1.2-1.4:1, the molecular weight range of fulvic acid is 800-1200 Da, and the molecular weight range of humic acid is 2500-4000 Da.

[0007] Preferably, the degree of polymerization of the ammonium polyphosphate is 4-6, and the total nitrogen-phosphorus molar ratio of the ammonium polyphosphate to the urea ammonium nitrate solution is controlled at 0.8-1.0:1.

[0008] Preferably, the nitrification inhibitor DMPP and the urease inhibitor NBPT are added at amounts of 1% of ammonium nitrogen and 1% of urea nitrogen, respectively.

[0009] Preferably, the mass ratio of EDTA-Fe, EDTA-Zn, and boric acid in the chelated trace elements is 1.2-1.5:1-1.2:0.5-0.8.

[0010] A method for preparing an organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects includes the following steps: (1) Mix fulvic acid, humic acid and deionized water in proportion, stir and dissolve at 52-58℃ for 32-38 minutes, stirring speed is 300-350rpm, to obtain humic acid mother liquor; (2) Add ammonium polyphosphate to the humic acid mother liquor obtained in step (1), control the temperature at 42-44℃, and ultrasonically disperse for 16-19 minutes; (3) Add urea ammonium nitrate solution slowly at a rate of 1.2%-1.8% of the total mass of the system per minute, and simultaneously add pH adjuster to adjust the pH of the system to 5.8-6.2. Stir continuously during the addition process at a speed of 250-300 rpm. (4) Add nitrification inhibitor DMPP and urease inhibitor NBPT, and stir continuously during the dropwise addition process at a speed of 250-300 rpm; (5) Add chelated trace elements and polyaspartic acid, and homogenize them under a pressure of 12-14 MPa for 15-20 minutes. Then filter them with a 0.22 μm microporous membrane. After filtration, fill the package to obtain an organic water-soluble fertilizer with synergistic effects of carbon, nitrogen and phosphorus.

[0011] Preferably, in step (1), during the process of stirring and dissolving fulvic acid, humic acid and deionized water, the uniformity of the solution is checked every 10 minutes to ensure that there are no obvious particulate substances in the solution. In step (3), the concentration of the pH adjuster is 0.5-1 mol / L, and the dropping rate ensures that the rate of pH change does not exceed 0.2 pH units / minute.

[0012] The organic water-soluble fertilizer prepared by the method described in claim 6 is applied to tomatoes, and the target nitrogen-phosphorus ratio is achieved through staged dilution and application. The application steps are as follows: (1) During the seedling to flowering stage of tomatoes, dilute the organic water-soluble fertilizer 300-400 times and apply 200-250 kg of diluted solution per hectare each time. At this time, the nitrogen-phosphorus ratio is 1:2. Apply once every 5-7 days and apply 2-3 times in a row. (2) During the fruiting period of tomatoes: dilute the organic water-soluble fertilizer 600-800 times, apply 350-400 kg of diluted solution per hectare each time, at which time the nitrogen-phosphorus ratio is 1:0.5, apply once every 10-12 days, and apply continuously for 3-4 times.

[0013] Preferably, during the drip irrigation fertilization process for tomatoes, the working pressure of the drip irrigation system is controlled at 0.15-0.2 MPa, and the dripper flow rate is 2-3 L / h, to ensure that the fertilizer solution is evenly distributed in the tomato rhizosphere area.

[0014] Preferably, during the tomato seedling to flowering stage, 0.05%-0.1% gibberellin can be applied to promote flower bud differentiation; during the fruiting stage, 0.1%-0.2% brassinolide can be applied to synergistically improve fruit development quality. It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0015] Meanwhile, through the above technical solutions, the present invention has at least the following beneficial effects: 1. The method for preparing organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects provided by this invention and its application on tomatoes achieve precise matching of nutrients in stages. During the seedling to flowering stage, the nitrogen-phosphorus ratio is 1:2, increasing the fresh weight of tomato roots by 25%-30% and improving the flower bud differentiation rate by 18%-22%. During the fruiting stage, the nitrogen-phosphorus ratio is 1:0.5, reducing the soil phosphorus fixation rate by 45%-50% and increasing the bioavailability of phosphorus by 42%-47%, thus meeting the needs of tomatoes throughout their entire growth period.

[0016] 2. The present invention significantly improves soil fertility, activates nitrogen-fixing microorganisms with a carbon-to-nitrogen ratio of 25:1, increases soil nitrogen retention capacity by 32%-37%, and reduces nitrogen emission loss by 28%-33%.

[0017] 3. The fertilizer utilization rate of this invention is greatly improved, making the nitrogen utilization rate of tomatoes reach 59%-63% (compared to 42%-45% for conventional fertilizers) and the phosphorus utilization rate reach 41%-45% (compared to 28%-32% for conventional fertilizers), while reducing fertilizer input costs by 18%-22%, resulting in significant fertilizer saving and efficiency improvement.

[0018] 4. This invention improves both the yield and quality of tomatoes, increasing the yield by 15%-18%, increasing the vitamin C content by 21%-25%, reducing the nitrate content by 34%-38%, increasing the soluble solids content by 1.3%-1.6%, and increasing the marketable fruit rate by 10%-12%, resulting in significant economic benefits for planting. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] Example 1 An organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects comprises the following components by weight percentage: The composition includes 25%-32% fulvic acid, 18%-25% humic acid, 15%-20% ammonium polyphosphate (calculated as P2O5), 8%-12% urea ammonium nitrate solution (N content 30%-32%), 0.8%-1.2% nitration inhibitor (DMPP) and urease inhibitor (NBPT) compounded, 0.9%-1.5% chelated trace elements (Fe, Zn, B, of which EDTA-Fe 0.4%-0.6%, EDTA-Zn 0.3%-0.5%, boric acid 0.2%-0.4%), 0.2%-0.4% polyaspartic acid, and the balance being deionized water. In this embodiment, the nitrogen fertilizer synergist is a 1:1 ratio of DMPP and NBPT. DMPP and NBPT inhibit the conversion of ammonium nitrogen and amide nitrogen into nitrate nitrogen, respectively, thereby reducing losses and improving utilization.

[0026] The fertilizer has a pH value of 5.8-6.2 and a total carbon-nitrogen-phosphorus (C:N:P) mass ratio of 25:1:1.2-1.5. By adjusting the material ratio of nitrogen and phosphorus sources, the N:P ratio of tomatoes is 1:2 from the seedling stage to the flowering stage and 1:0.5 during the fruiting stage. Specifically, by adjusting the raw material ratio, the N:P ratio is changed from 1:2 to 1:0.5, so that the nitrogen and phosphorus supply ratio is coordinated with the crop's needs. The mass ratio of fulvic acid to humic acid is 1.2-1.4:1, the molecular weight range of fulvic acid is 800-1200 Da, and the molecular weight range of humic acid is 2500-4000 Da. The degree of polymerization of ammonium polyphosphate is 4-6, and the total nitrogen-phosphorus molar ratio of ammonium polyphosphate to urea ammonium nitrate solution is controlled at 0.8-1.0:1; The nitrification inhibitor DMPP and the urease inhibitor NBPT were added at amounts of 1% of ammonium nitrogen and 1% of urea nitrogen, respectively. The mass ratio of EDTA-Fe, EDTA-Zn, and boric acid is 1.2-1.5:1-1.2:0.5-0.8.

[0027] Example 2 refer to Figure 1 Based on the above-described Example 1, a method for preparing an organic water-soluble fertilizer with synergistic effects of carbon, nitrogen, and phosphorus is disclosed, comprising the following steps: (1) Mix fulvic acid, humic acid and deionized water in proportion, stir and dissolve at 52-58℃ for 32-38 minutes, stirring speed is 300-350rpm, to obtain humic acid mother liquor; In step (1), during the process of stirring and dissolving fulvic acid, humic acid and deionized water, the uniformity of the solution is checked every 10 minutes to ensure that there are no obvious particulate substances in the solution. (2) Add ammonium polyphosphate to the humic acid mother liquor obtained in step (1), control the temperature at 42-44℃, and ultrasonically disperse for 16-19 minutes; (3) Add urea ammonium nitrate solution slowly at a rate of 1.2%-1.8% of the total mass of the system per minute, and simultaneously add pH adjuster to adjust the pH of the system to 5.8-6.2. Stir continuously during the addition process at a speed of 250-300 rpm. In step (3), the concentration of the pH adjuster is 0.5-1 mol / L, and the dropping rate is adjusted according to the pH change of the system to ensure that the pH change rate does not exceed 0.2 pH units / minute; (4) Add nitrification inhibitor DMPP and urease inhibitor NBPT, and stir continuously during the dropwise addition process at a speed of 250-300 rpm; (5) Add chelated trace elements and polyaspartic acid, and homogenize under a pressure of 12-14 MPa for 15-20 minutes. Then filter with a 0.22μm microporous membrane. After filtration, fill the container to obtain an organic water-soluble fertilizer with synergistic effects of carbon, nitrogen and phosphorus.

[0028] Example 3 Based on the above-mentioned Example 1, the application of the organic water-soluble fertilizer prepared by the method on tomatoes is disclosed. By adding the nitrification inhibitor DMPP and the urease inhibitor NBPT to regulate the concentration of ammonium nitrogen and nitrate nitrogen, the process of mineralizing ammonium nitrogen into nitrate nitrogen is slowed down, reducing the leaching of nitrate nitrogen and the emission loss of gases such as nitrous oxide and nitrogen oxide by 21%. Specifically: The target nitrogen-to-phosphorus ratio is achieved through staged dilution application. The application steps are as follows: (1) During the seedling to flowering stage of tomatoes, dilute the organic water-soluble fertilizer 300-400 times and apply 200-250 kg of diluted solution per hectare each time. At this time, the nitrogen-phosphorus ratio (N:P) is 1:2. Apply once every 5-7 days and apply 2-3 times in a row. During the drip irrigation fertilization process for tomatoes, the working pressure of the drip irrigation system is controlled at 0.15-0.2MPa, and the dripper flow rate is 2-3L / h to ensure that the fertilizer solution is evenly distributed in the root and stem area of ​​the tomato. During the tomato seedling to flowering stage, 0.05%-0.1% gibberellin can be applied to promote flower bud differentiation; during the fruiting stage, 0.1%-0.2% brassinolide can be applied to synergistically improve fruit development quality.

[0029] (2) During the fruiting period of tomatoes (including the fruit enlargement period): dilute the organic water-soluble fertilizer 600-800 times, apply 350-400 kg of diluted solution per hectare each time, at which time the nitrogen-phosphorus ratio (N:P) is 1:0.5, apply once every 10-12 days, and apply continuously for 3-4 times.

[0030] Example 4 Based on the above embodiments one to three, the following is disclosed: 1. Formula By weight percentage, the composition is as follows: 28% fulvic acid, 22% humic acid, 18% ammonium polyphosphate (calculated as P2O5, degree of polymerization 5), 10% urea ammonium nitrate solution (N content 31%), 1% compound of nitration inhibitor and urease inhibitor (ratio 1:1), 0.5% EDTA-Fe, 0.4% EDTA-Zn, 0.3% boric acid, 0.3% polyaspartic acid, and 19.5% deionized water; the total mass ratio of carbon, nitrogen, and phosphorus is 25:1:1.3.

[0031] 2. Preparation steps Preparation of humic acid mother liquor: 28 kg of fulvic acid, 22 kg of humic acid and 19.5 kg of deionized water were mixed and stirred at 55℃ and 320 rpm for 35 minutes to dissolve. The uniformity was checked every 10 minutes to obtain humic acid mother liquor.

[0032] Ultrasonic dispersion: Add 18 kg of ammonium polyphosphate and ultrasonically disperse at 30 kHz and 350 W at 43 ℃ for 17 minutes to ensure uniform dispersion of the phosphorus source.

[0033] pH adjustment and nitrogen source addition: Add 10 kg of urea ammonium nitrate solution at a rate of 1.5% / min, and simultaneously add 0.8 mol / L citric acid solution, controlling the pH change rate to ≤0.2 pH units / min, and finally adjust to 6.0.

[0034] Add 1 kg of nitrification inhibitor DMPP and urease inhibitor NBPT, stirring continuously at 280 rpm during the dropwise addition process. Homogenization, filtration and filling: Add 0.5 kg of EDTA-Fe, 0.4 kg of EDTA-Zn, 0.3 kg of boric acid and 0.3 kg of polyaspartic acid, homogenize at 13 MPa pressure for 18 minutes, filter through a 0.22 μm microporous membrane and then fill.

[0035] 3. Application Method From seedling stage to flowering stage: Dilute the fertilizer 350 times, apply 220 kg of diluted solution per hectare each time, with a nitrogen-phosphorus ratio of 1:2, apply once every 5 days, for a total of 3 applications; mix with 0.08% gibberellin for drip irrigation, with a drip irrigation pressure of 0.18 MPa and a dripper flow rate of 2.5 L / h.

[0036] During the fruiting period: dilute the fertilizer 700 times, apply 380 kg of diluted solution per hectare each time, with a nitrogen-phosphorus ratio of 1:0.5, apply once every 10 days, for a total of 4 applications; mix with 0.15% brassinolide for drip irrigation.

[0037] 4. Application Effects From seedling stage to flowering stage: fresh weight of tomato roots increased by 27%, flower bud differentiation rate increased by 20.5%; activity of soil nitrogen-fixing microorganisms increased by 35%, and nitrogen emission loss decreased by 30%.

[0038] Results period: Soil phosphorus bioavailability increased by 45%, phosphorus fixation rate decreased by 48%; soil organic carbon content increased by 1.25 g / kg.

[0039] Harvest period: Nitrogen utilization rate of tomatoes was 61.2%, phosphorus utilization rate was 43.5% (compared to 43.9% for conventional fertilizers and 29.6% for conventional fertilizers); yield increased by 16.8%, vitamin C content of fruits increased by 23.2%, nitrate content decreased by 36.5%, and marketable fruit rate increased by 11.3%.

[0040] Example 5 Based on the above embodiments one to three, the following is disclosed: 1. Formula By weight percentage, the composition is as follows: 25% fulvic acid, 21% humic acid, 15% ammonium polyphosphate (calculated as P2O5, degree of polymerization 4), 8% urea ammonium nitrate solution (N content 30%), 0.8% compound nitration inhibitor and urease inhibitor, 0.4% EDTA-Fe, 0.3% EDTA-Zn, 0.2% boric acid, 0.2% polyaspartic acid, and 29.1% deionized water; the total mass ratio of carbon, nitrogen, and phosphorus is 25:1:1.2.

[0041] 2. Preparation steps Preparation of humic acid mother liquor: 25 kg of fulvic acid, 21 kg of humic acid and 29.1 kg of deionized water were mixed and stirred at 52℃ and 300 rpm for 32 minutes to dissolve. After checking the uniformity, the mother liquor was obtained.

[0042] Ultrasonic dispersion: Add 15 kg of ammonium polyphosphate and ultrasonically disperse at 25 kHz and 300 W for 16 minutes at 42 ℃.

[0043] pH adjustment and nitrogen source addition: Add 8 kg of urea ammonium nitrate solution dropwise at a rate of 1.2% / min, and add 0.5 mol / L citric acid to adjust the pH to 5.8.

[0044] Add 0.8 kg of nitration inhibitor DMPP and urease inhibitor NBPT, stirring continuously at 250 rpm during the dropwise addition process; Homogenization, filtration and filling: Add trace elements and polyaspartic acid, homogenize at 12MPa for 15 minutes, filter and then fill.

[0045] 3. Application Method From seedling stage to flowering stage: dilute 300 times, apply 200 kg of diluted solution per hectare, with a nitrogen-to-phosphorus ratio of 1:2, and apply twice every 6 days; mix with 0.05% gibberellin, drip irrigation pressure 0.15 MPa, dripper flow rate 2 L / h.

[0046] During the fruiting period: dilute 600 times, apply 350 kg of diluted solution per hectare, with a nitrogen-to-phosphorus ratio of 1:0.5, and apply 3 times every 11 days; supplement with 0.1% brassinolide.

[0047] 4. Application Effects The root fresh weight increased by 25%, the flower bud differentiation rate increased by 18.3%, and the soil nitrogen emission loss decreased by 28%.

[0048] Soil phosphorus bioavailability increased by 42%, phosphorus fixation rate decreased by 45%, and organic carbon content increased by 1.1 g / kg.

[0049] The nitrogen utilization rate of tomatoes was 59.3%, and the phosphorus utilization rate was 41.2%; the yield increased by 15.2%, the vitamin C content increased by 21.4%, the nitrate content decreased by 34.3%, and the marketable fruit rate increased by 10.1%.

[0050] Example 6 Based on the above embodiments one to three, the following is disclosed: 1. Formula By weight percentage, the composition is as follows: 32% fulvic acid, 25% humic acid, 20% ammonium polyphosphate (calculated as P2O5, degree of polymerization 6), 12% urea ammonium nitrate solution (N content 32%), 1.2% nitration inhibitor and urease inhibitor compound, 0.6% EDTA-Fe, 0.5% EDTA-Zn, 0.4% boric acid, 0.4% polyaspartic acid, and 7.9% deionized water (in actual production, the total proportion is ensured to be 100% by adjusting the deionized water content); the total mass ratio of carbon, nitrogen, and phosphorus is 25:1:1.5.

[0051] 2. Preparation steps Preparation of humic acid mother liquor: Mix 32 kg of fulvic acid and 25 kg of humic acid with an appropriate amount of deionized water, and stir at 58°C and 350 rpm for 38 minutes to dissolve.

[0052] Ultrasonic dispersion: Add 20 kg of ammonium polyphosphate and ultrasonically disperse at 35 kHz and 400 W at 44 ℃ for 19 minutes.

[0053] pH adjustment and nitrogen source addition: Add 12 kg of urea ammonium nitrate solution dropwise at a rate of 1.8% / min, and add 1 mol / L potassium hydroxide to adjust the pH to 6.2.

[0054] Add 1.2 kg of nitration inhibitor DMPP and urease inhibitor NBPT, stirring continuously at 300 rpm during the dropwise addition process; Homogenization, filtration and filling: Add trace elements and polyaspartic acid, homogenize at 14MPa for 20 minutes, filter and then fill.

[0055] 3. Application Method Seedling stage to flowering stage: Dilute 400 times, apply 250 kg of diluted solution per hectare, with a nitrogen-phosphorus ratio of 1:2, and apply 3 times every 5 days; mix with 0.1% gibberellin, drip irrigation pressure 0.2 MPa, dripper flow rate 3 L / h.

[0056] During the fruiting period: dilute 800 times, apply 400 kg of diluted solution per hectare, with a nitrogen-to-phosphorus ratio of 1:0.5, and apply 4 times every 10 days; supplement with 0.2% brassinolide.

[0057] 4. Application Effects The root fresh weight increased by 30%, the flower bud differentiation rate increased by 21.8%, and the soil nitrogen emission loss decreased by 33%.

[0058] Soil phosphorus bioavailability increased by 47%, phosphorus fixation rate decreased by 50%, and organic carbon content increased by 1.4 g / kg.

[0059] The nitrogen utilization rate of tomatoes was 62.8%, and the phosphorus utilization rate was 44.8%. The yield increased by 17.9%, the vitamin C content increased by 24.7%, the nitrate content decreased by 37.8%, and the marketable fruit rate increased by 11.8%.

[0060] Example 7 Based on Examples 1 to 6 above, the specific preparation requirements are as follows: Fertilizer should be stored in a cool, dry, and well-ventilated place at 5-30℃, avoiding direct sunlight and high temperatures; it should be used within 15 days after opening to prevent the carbon source from oxidizing and becoming ineffective.

[0061] When diluting in stages, the dilution ratio must be precisely controlled to ensure that the target nitrogen-phosphorus ratio is met. Before drip irrigation, check the pipe patency and after application, flush the pipe with clean water for 5-10 minutes to avoid residual crystals clogging the drippers.

[0062] Soil fertility and tomato varieties vary in different regions. The application rate can be adjusted within ±10% of the recommended amount based on soil test results and tomato growth. The application rate can be increased appropriately for poor soil.

[0063] During the preparation process, fulvic acid and humic acid must be fully dissolved, and the ultrasonic dispersion time should not be less than 16 minutes; pH adjustment should be carried out slowly to avoid affecting the stability of the fertilizer due to sudden pH changes.

[0064] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A water-soluble organic fertilizer with synergistic carbon, nitrogen, and phosphorus effects, characterized in that, The following are the matching examples: The composition consists of 25%-32% fulvic acid, 18%-25% humic acid, 15%-20% ammonium polyphosphate, 8%-12% urea ammonium nitrate solution, 0.8%-1.2% nitration inhibitor and urease inhibitor compound, 0.9%-1.5% chelated trace elements, 0.2%-0.4% polyaspartic acid, and the balance being deionized water.

2. The organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects according to claim 1, characterized in that, The fertilizer has a pH value of 5.8-6.2 and a total carbon-nitrogen-phosphorus (C:N:P) mass ratio of 25:1:1.2-1.

5. By adjusting the material ratio of nitrogen and phosphorus sources, the nitrogen-phosphorus (N:P) ratio is 1:2 from the seedling stage to the flowering stage and 1:0.5 during the fruiting stage, so that the nitrogen and phosphorus supply ratio is coordinated with the crop's needs. The mass ratio of fulvic acid to humic acid is 1.2-1.4:1, the molecular weight range of fulvic acid is 800-1200 Da, and the molecular weight range of humic acid is 2500-4000 Da.

3. The organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects according to claim 1, characterized in that, The degree of polymerization of the ammonium polyphosphate is 4-6, and the total nitrogen-phosphorus molar ratio of the ammonium polyphosphate to the urea ammonium nitrate solution is controlled at 0.8-1.0:

1.

4. The organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects according to claim 1, characterized in that, The nitrification inhibitor DMPP and the urease inhibitor NBPT are added at amounts of 1% of ammonium nitrogen and 1% of urea nitrogen, respectively.

5. The organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects according to claim 1, characterized in that, The mass ratio of EDTA-Fe, EDTA-Zn, and boric acid in the chelated trace elements is 1.2-1.5:1-1.2:0.5-0.

8.

6. A method for preparing a carbon-nitrogen-phosphorus synergistic organic water-soluble fertilizer, used in any one of claims 1-5, characterized in that, The steps are as follows: (1) Mix fulvic acid, humic acid and deionized water in proportion, stir and dissolve at 52-58℃ for 32-38 minutes, stirring speed is 300-350rpm, to obtain humic acid mother liquor; (2) Add ammonium polyphosphate to the humic acid mother liquor obtained in step (1), control the temperature at 42-44℃, and ultrasonically disperse for 16-19 minutes; (3) Add urea ammonium nitrate solution slowly at a rate of 1.2%-1.8% of the total mass of the system per minute, and simultaneously add pH adjuster to adjust the pH of the system to 5.8-6.

2. Stir continuously during the addition process at a speed of 250-300 rpm. (4) Add nitrification inhibitor DMPP and urease inhibitor NBPT, and stir continuously during the dropwise addition process at a speed of 250-300 rpm; (5) Add chelated trace elements and polyaspartic acid, and homogenize them under a pressure of 12-14 MPa for 15-20 minutes. Then filter them with a 0.22 μm microporous membrane. After filtration, fill the package to obtain an organic water-soluble fertilizer with synergistic effects of carbon, nitrogen and phosphorus.

7. The method for preparing an organic water-soluble fertilizer with synergistic carbon, nitrogen, and phosphorus effects according to claim 6, characterized in that, In step (1), during the process of stirring and dissolving fulvic acid, humic acid and deionized water, the uniformity of the solution is checked every 10 minutes to ensure that there are no obvious particulate substances in the solution. In step (3), the concentration of the pH adjuster is 0.5-1 mol / L, and the dropping rate ensures that the rate of pH change does not exceed 0.2 pH units / minute.

8. The application of the organic water-soluble fertilizer prepared by the method of claim 6 on tomatoes, characterized in that, The target nitrogen-to-phosphorus ratio is achieved through staged dilution application. The application steps are as follows: (1) During the seedling to flowering stage of tomatoes, dilute the organic water-soluble fertilizer 300-400 times and apply 200-250 kg of diluted solution per hectare each time. At this time, the nitrogen-phosphorus ratio is 1:

2. Apply once every 5-7 days and apply 2-3 times in a row. (2) During the fruiting period of tomatoes: dilute the organic water-soluble fertilizer 600-800 times, apply 350-400 kg of diluted solution per hectare each time, at which time the nitrogen-phosphorus ratio is 1:0.5, apply once every 10-12 days, and apply continuously for 3-4 times.

9. The application according to claim 8, characterized in that, During the drip irrigation fertilization process for tomatoes, the working pressure of the drip irrigation system is controlled at 0.15-0.2MPa, and the dripper flow rate is 2-3L / h to ensure that the fertilizer solution is evenly distributed in the tomato rhizosphere area.

10. The application according to claim 8, characterized in that, During the tomato seedling to flowering stage, 0.05%-0.1% gibberellin can be applied to promote flower bud differentiation; during the fruiting stage, 0.1%-0.2% brassinolide can be applied to synergistically improve fruit development quality.

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