Method for increasing utilization rate of fertilizer by adding synergist and product

Abstract

The invention relates to the technical field of fertilizers, and particularly discloses a method for increasing the utilization rate of a fertilizer by adding a synergist and a product. The method for increasing the utilization rate of the fertilizer by adding the synergist comprises the following steps: adding chondroitin sulfate into deionized water, adjusting the pH value of a system to 3-4, adding potassium permanganate, stirring for 1-4 hours, and adjusting the pH value of the system to 6-6.5 to obtain a prefabricated material a; adding polysuccinimide and lysine into N, N-dimethylformamide, stirring until a precipitate is completely separated out, collecting the precipitate, adding a nitrogen fertilizer, a phosphate fertilizer and a potash fertilizer into the precipitate, stirring for 10-30 minutes, spraying the prefabricated material a into the precipitate in a stirring state, continuously stirring for 1-2 hours, and performing vacuum drying to obtain a prefabricated material b; and stirring the prefabricated material b, a nitrification inhibitor, bentonite, zeolite powder, sodium alginate and compound trace elements for 1-2 hours, spraying a calcium chloride solution, granulating and drying.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, and in particular to a method and a product for improving fertilizer utilization by adding a synergist. Background Art

[0002] At present, in agricultural production, fertilization is required to ensure that crops can absorb sufficient nutrients. my country's annual fertilizer application is huge, but improper fertilization often leads to the inability of crops to fully absorb nutrients, and the utilization rate of fertilizers is low. In order to pursue high crop yields, farmers apply a large amount of fertilizers, which not only increases the economic burden, but also pollutes the soil.

[0003] The main reasons for the low utilization rate of existing fertilizers include: excessive fertilization of crops, nutrient leaching, volatilization, surface runoff and other losses. This will lead to low economic benefits of fertilizer application, huge waste of resources, and pollution of groundwater and soil surface sources, which will deteriorate the ecological environment. At present, the pollution caused by fertilization to the soil has received more and more attention. Improving fertilizer efficiency to reduce fertilizer use is an important way to alleviate soil pollution. Improving crop yields and fertilizer nutrient utilization efficiency, and coordinating crop high yields with environmental protection have great practical significance.

[0004] At present, fertilizer enhancers are mainly studied from the aspects of nitrification inhibitors, urease inhibitors, ammonia stabilizers, etc., but they are greatly affected by external environmental factors, the effects are unstable, and they are very easy to pollute water bodies. They are not suitable for long-term application, and the synergistic effect on phosphate fertilizers and potassium fertilizers is not obvious, making it difficult to improve the comprehensive utilization rate of fertilizers.

[0005] Polyaspartic acid is a highly efficient fertilizer enhancer. It has a strong chelating function for nutrients, can effectively enrich the nutrients in the soil for crops to absorb and utilize, and can also play a certain regulatory role in the growth of crops, which can appropriately reduce the amount of fertilizer applied and improve the utilization rate of fertilizers. Although polyaspartic acid has excellent properties, it is relatively sensitive to environmental conditions, especially being rapidly degraded by microorganisms in the soil, which affects the long-term performance of its functions. It has relatively weak fertilizer retention ability and insufficient slow release, resulting in a relatively low utilization rate of fertilizers.

[0006] Therefore, developing a new fertilizer enhancer to improve the utilization rate of chemical fertilizers, and comprehensively improve the utilization rate of nitrogen, phosphorus and potassium fertilizers, promote the effective absorption and utilization of fertilizers by crops, reduce the amount used and the number of fertilizations, reduce environmental pollution, and improve the quality of crops is of great significance to my country's agricultural development and ecological environment protection. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method and product for improving the utilization rate of fertilizer by adding a synergist.

[0008] A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add chondroitin sulfate to deionized water, adjust the pH value of the system to 3-4, add potassium permanganate and stir for 1-4h, the stirring temperature is 30-40°C, adjust the pH value of the system to 6-6.5, and obtain a prefabricated material. a ; S2. Add polysuccinimide and lysine to N,N-dimethylformamide and stir at a temperature of 50-60°C until precipitation is complete. Collect the precipitate, add nitrogen fertilizer, phosphate fertilizer and potash fertilizer and stir for 10-30 minutes. Spray the prefabricated material into the mixture while stirring. a Continue stirring for 1-2 hours at a stirring temperature of 40-50°C and vacuum dry to obtain a preform b ; S3, prefabricated material b , nitrification inhibitor, bentonite, zeolite powder, sodium alginate, and composite trace elements are stirred for 1-2 hours, and calcium chloride solution is sprayed therein and granulated and dried.

[0009] Preferably, in S1, the mass ratio of chondroitin sulfate to potassium permanganate is 1-3:1-3.

[0010] Preferably, in S1, hydrochloric acid with a concentration of 0.5-1.5 mol / L is used to adjust the pH value of the system to 3-4.

[0011] Preferably, in S1, a disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with a pH value of 5-8 is used to adjust the pH value of the system to 6-6.5.

[0012] Preferably, in S2, polysuccinimide, lysine, nitrogen fertilizer, phosphate fertilizer, potash fertilizer and prefabricated material a The mass ratio is 5-10:1-2:50-100:10-30:5-15:25-50.

[0013] Preferably, in S2, the nitrogen fertilizer is at least one of urea, ammonium chloride, ammonium sulfate and ammonium bicarbonate.

[0014] Preferably, in S2, the phosphate fertilizer is at least one of superphosphate, double superphosphate, monoammonium phosphate and diammonium phosphate.

[0015] Preferably, in S2, the potash fertilizer is at least one of potassium sulfate, potassium chloride, potassium nitrate and potassium dihydrogen phosphate.

[0016] Preferably, in S3, the composite trace elements include at least one of magnesium sulfate, zinc sulfate, ferrous sulfate and borax.

[0017] Preferably, in S3, the concentration of the calcium chloride solution is 0.1-1 mol / L, and the prefabricated material bThe mass ratio of nitrification inhibitor, bentonite, zeolite powder, sodium alginate, composite trace elements and calcium chloride solution is 20-40:1-2:5-15:1-5:1-5:0.3-3:5-10.

[0018] A compound fertilizer with high fertilizer utilization rate is prepared by adopting the method of adding a synergist to improve the fertilizer utilization rate. Beneficial Effects

[0019] The present invention adopts polysuccinimide and lysine to promote the ring opening of imide to form an amine group, which not only has good affinity with nitrogen fertilizer (especially urea), but also has extremely high mutual dispersion uniformity. At the same time, it can be dispersed with phosphate fertilizer and potash fertilizer, and the prefabricated material is coated on its surface. a After condensation reaction, not only the performance is stable, the stability of polyaspartic acid is greatly enhanced, and its sensitivity to the environment is reduced, but also it can be compounded with nitrification inhibitors to greatly enhance the absorption and utilization efficiency of nitrogen fertilizer. However, the applicant has found through experiments that the obtained prefabricated material b The synergistic effect on phosphorus fertilizer and potassium fertilizer is not obvious, and the quality of crops is poor.

[0020] The present invention further comprises the prefabricated material b Combined with bentonite, zeolite powder and sodium alginate, prefabricated b It is the inner layer particle, while bentonite and zeolite powder have a large number of gaps, which adsorb each other to form a double slow-release, reducing the overall fertilizer release rate of nitrogen, phosphorus and potassium, and further generating an in-situ calcium alginate coating layer on its surface, which can not only effectively enhance the stability of the particles and avoid the difficulty in controlling the fertilizer effect due to breakage, but also has excellent slow-release effect, and can be released according to the laws of crops, with excellent control effect, and one application can meet the needs of the crop throughout the growth period, and has strong penetration ability into the soil, excellent water retention capacity, and significant environmental benefits.

[0021] The present invention can not only effectively prolong the effective period of nitrogen fertilizer and improve the absorption and utilization effect of nitrogen by crops, but also has an excellent controlled-release effect on phosphorus fertilizer and potassium fertilizer, comprehensively improves the utilization efficiency of fertilizers, and can enhance the effective enrichment of trace elements required by crops in the soil, and promote the absorption of other nutrient elements by crops.

[0022] The fertilizer of the present invention can meet the needs of crops in the entire growing season with one fertilization, effectively improve the fertilizer utilization rate of crops, and effectively promote the growth of crops with the reasonable application of fertilizers. The production process is simple, easy to control, and has a stable effect, which comprehensively improves the fertilizer utilization rate.

[0023] The present invention can increase the nitrogen absorption rate to more than 60%, the phosphorus absorption rate to more than 30%, and the potassium absorption rate to more than 40%, thereby saving labor and time in agricultural production and greatly reducing labor intensity and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a comparison chart of plant height and yield of cabbage harvested from Example 5, Comparative Example 1, Comparative Example 2, conventional control group, and blank control group.

[0025] Figure 2 It is a comparison chart of nitrogen, phosphorus and potassium utilization rates of Example 5, Comparative Example 1, Comparative Example 2 and the conventional control group.

[0026] Figure 3 It is a comparison chart of organic matter and alkaline nitrogen content in the soil after harvest in Example 5, Comparative Example 1, Comparative Example 2, and the conventional control group.

[0027] Figure 4 It is a comparison chart of the available phosphorus and available potassium contents in the soil after harvest in Example 5, Comparative Example 1, Comparative Example 2, and the conventional control group.

[0028] Figure 5 It is a comparison chart of the growth rates of organic matter, alkaline-hydrolyzed nitrogen, available phosphorus and available potassium contents in the soil after harvest in Example 5, Comparative Example 1, Comparative Example 2 and the conventional control group. DETAILED DESCRIPTION

[0029] The present invention will be further explained below in conjunction with specific embodiments.

[0030] The composite trace elements used below were purchased from Tianmou Chemical (Shanxi) Group Co., Ltd. and are named Iron Zinc Calcium Magnesium Boron, in which CaO+MgO≥27%, Cu+Zn+B+Fe=0.2-1.0%. Example

[0031] A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add 100g of chondroitin sulfate to 2000g of deionized water, adjust the pH value of the system to 3-4 with 0.5mol / L hydrochloric acid, add 100g of potassium permanganate and stir for 1h at 30°C, and adjust the pH value of the system to 6-6.5 with disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with pH=6.8 to obtain a preform. a ; S2, 500g polysuccinimide and 100g lysine were added to 3000g N, N-dimethylformamide and stirred at 50°C until precipitation was complete, the precipitate was collected, 5000g ammonium chloride, 1000g monoammonium phosphate and 500g potassium dihydrogen phosphate were added thereto, stirred at a speed of 100r / min for 10min, and 2500g prefabricated material was sprayed therein while stirring. a Continue stirring for 1 hour at a stirring temperature of 40°C and vacuum dry to obtain the preform b ; S3, 2000g prefabricated material b , 100g 3,4-dimethylpyrazole phosphate, 500g bentonite, 100g zeolite powder, 100g sodium alginate, and 30g complex trace elements are stirred for 1h at a stirring speed of 500r / min, 500g 0.1mol / L calcium chloride solution is sprayed therein and granulated, and then sent to a 40°C drying room to dry to constant weight. Example

[0032] A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add 300g of chondroitin sulfate to 4000g of deionized water, adjust the pH value of the system to 3-4 with 1.5mol / L hydrochloric acid, add 300g of potassium permanganate and stir for 4h at a stirring temperature of 40°C, and adjust the pH value of the system to 6-6.5 with disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with a pH value of 8.0 to obtain a preform. a ; S2, add 1000g polysuccinimide and 200g lysine to 6000g N, N-dimethylformamide and stir at 60°C until precipitation is complete, collect the precipitate, add 10000g ammonium sulfate, 3000g heavy superphosphate and 1500g potassium nitrate, stir at 500r / min for 30min, spray 5000g prefabricated material into it while stirring a Continue stirring for 2 hours at a stirring temperature of 50°C and vacuum dry to obtain the preform b ; S3, 4000g prefabricated material b , 200g 2-chloro-6-trichloromethylpyridine, 1500g bentonite, 500g zeolite powder, 500g sodium alginate, and 300g composite trace elements are stirred for 2h at a stirring speed of 1500r / min, 1000g 1mol / L calcium chloride solution is sprayed therein and granulated, and then sent to a 40°C drying room to be dried to constant weight. Example

[0033] A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add 150g of chondroitin sulfate to 3500g of deionized water, adjust the pH value of the system to 3-4 with 0.8mol / L hydrochloric acid, add 250g of potassium permanganate and stir for 2h at a stirring temperature of 33°C, and adjust the pH value of the system to 6-6.5 with disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with a pH value of 7.4 to obtain a preform. a ; S2, add 700g polysuccinimide and 170g lysine to 4000g N, N-dimethylformamide and stir at a stirring temperature of 58°C until precipitation is complete, collect the precipitate, add 7000g urea, 2500g superphosphate and 800g potassium chloride, stir at a speed of 400r / min for 15min, and spray 4000g prefabricated material into it while stirring. a , continue stirring for 80 min, the stirring temperature is 48°C, and vacuum dry to obtain the preform b ; S3, 2400g prefabricated material b , 170g 3,4-dimethylpyrazole phosphate, 800g bentonite, 400g zeolite powder, 200g sodium alginate, and 210g composite trace elements are stirred for 80min at a stirring speed of 1200r / min, 700g 0.7mol / L calcium chloride solution is sprayed therein and granulated, and then sent to a 40°C drying room to be dried to constant weight. Example

[0034] A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add 250g of chondroitin sulfate to 2500g of deionized water, adjust the pH value of the system to 3-4 with 1.2mol / L hydrochloric acid, add 150g of potassium permanganate and stir for 3h at a stirring temperature of 37°C, and adjust the pH value of the system to 6-6.5 with disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with a pH value of 7.2 to obtain a preform. a ; S2, 900g polysuccinimide and 130g lysine were added to 5000g N, N-dimethylformamide and stirred at 52°C until precipitation was complete, the precipitate was collected, 9000g urea, 1500g superphosphate and 1200g potassium chloride were added thereto, stirred at a speed of 200r / min for 25min, and 3500g prefabricated material was sprayed therein while stirring. a , continue stirring for 100 min, the stirring temperature is 42°C, and vacuum dry to obtain the preform b ; S3, 3600g prefabricated material b , 130g 2-chloro-6-trichloromethylpyridine, 1200g bentonite, 200g zeolite powder, 400g sodium alginate, and 90g complex trace elements are stirred for 100min at a stirring speed of 800r / min, 900g 0.3mol / L calcium chloride solution is sprayed therein and granulated, and then sent to a 40℃ drying room to be dried to constant weight. Example

[0035] A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add 200g of chondroitin sulfate to 3000g of deionized water, adjust the pH value of the system to 3-4 with 1mol / L hydrochloric acid, add 200g of potassium permanganate and stir for 2.5h at 35°C, and adjust the pH value of the system to 6-6.5 with disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with pH=7.5 to obtain a preform. a ; S2, 800g polysuccinimide and 150g lysine were added to 4500g N, N-dimethylformamide and stirred at 55°C until precipitation was complete, the precipitate was collected, 8000g urea, 2000g superphosphate and 1000g potassium chloride were added thereto, stirred at a speed of 300r / min for 20min, and 3800g prefabricated material was sprayed therein while stirring. a , continue stirring for 90 minutes, the stirring temperature is 45℃, and vacuum dry to obtain the preform b ; S3, 3000g prefabricated material b , 150g 3,4-dimethylpyrazole phosphate, 1000g bentonite, 300g zeolite powder, 300g sodium alginate, and 150g composite trace elements are stirred for 90min at a stirring speed of 1000r / min, 800g 0.5mol / L calcium chloride solution is sprayed therein and granulated, and then sent to a 40°C drying room to be dried to constant weight.

[0036] Comparative Example 1 A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add 200g of chondroitin sulfate to 3000g of deionized water and adjust the pH value of the system to 6-6.5 to obtain a prefabricated material. a ; S2, 800g polysuccinimide and 150g lysine were added to 4500g N, N-dimethylformamide and stirred at 55°C until precipitation was complete, the precipitate was collected, 8000g urea, 2000g superphosphate and 1000g potassium chloride were added thereto, stirred at a speed of 300r / min for 20min, and 3800g prefabricated material was sprayed therein while stirring. a , continue stirring for 90 minutes, the stirring temperature is 45℃, and vacuum dry to obtain the preform b ; S3, 3000g prefabricated material b, 150g 3,4-dimethylpyrazole phosphate, 1000g bentonite, 300g zeolite powder, 300g sodium alginate, and 150g composite trace elements are stirred for 90min at a stirring speed of 1000r / min, 800g 0.5mol / L calcium chloride solution is sprayed therein and granulated, and then sent to a 40°C drying room to be dried to constant weight.

[0037] Comparative Example 2 A method for improving fertilizer utilization by adding a synergist comprises the following steps: S1. Add 200g of chondroitin sulfate to 3000g of deionized water, adjust the pH value of the system to 3-4 with 1mol / L hydrochloric acid, add 200g of potassium permanganate and stir for 2.5h at 35°C, and adjust the pH value of the system to 6-6.5 with disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with pH=7.5 to obtain a preform. a ; S2, 800g polysuccinimide and 150g lysine were added to 4500g N, N-dimethylformamide and stirred at 55°C until precipitation was complete, the precipitate was collected, 8000g urea, 2000g superphosphate and 1000g potassium chloride were added thereto, stirred at a speed of 300r / min for 20min, and 3800g prefabricated material was sprayed therein while stirring. a , continue stirring for 90 minutes, the stirring temperature is 45℃, and vacuum dry to obtain the preform b ; S3, 3000g prefabricated material b , 150g 3,4-dimethylpyrazole phosphate, 1000g bentonite, 300g zeolite powder, 300g sodium alginate, and 150g complex trace elements are stirred for 90min at a stirring speed of 1000r / min, granulated, and then sent to a 40℃ drying room to dry to constant weight.

[0038] The compound fertilizer obtained by Example 5 and Comparative Examples 1-2 was used for field test, as follows: In a certain agricultural demonstration park in Fuyang City, Anhui Province, as a greenhouse test area, soil was sampled, and the organic matter content in the soil conditions was 18.33 g / kg, 93.24 mg / kg of alkaline nitrogen, 0.91 g / kg of total nitrogen, 29.14 mg / kg of available phosphorus, and 137.45 mg / kg of available potassium. The greenhouse was randomly divided into 5 groups, each group was separated by more than 1 m, and Zigan 85 was used as the purple cabbage variety for testing.

[0039] Among them, the compound fertilizer obtained in Example 5 was used as base fertilizer in Example 5, the compound fertilizer obtained in Example 1 was used as base fertilizer in Comparative Example 1, the compound fertilizer obtained in Comparative Example 2 was used as base fertilizer in Comparative Example 2, the conventional control group used a compound fertilizer obtained by mixing urea, superphosphate and potassium chloride in a mass ratio of 8:2:1 as base fertilizer, and the blank control group did not apply any fertilizer. Each group applied the corresponding compound fertilizer into the soil at a superphosphate content of 30kg / mu. The management of other pests and diseases was consistent.

[0040] After harvest, the plant height, yield, and nitrogen, phosphorus, and potassium utilization rates of the cabbages obtained in each group were counted or calculated. Then, soil samples were taken from each group after harvest to determine the content of organic matter, alkaline nitrogen, available phosphorus, and available potassium.

[0041] like Figure 1 As shown, the height and yield of the cabbage plants harvested in each fertilization group were higher than those in the blank control group (P < 0.05), indicating that fertilization is beneficial to the growth of cabbage. The height and yield of the cabbage plants harvested in Example 5, Comparative Example 1, and Comparative Example 2 were higher than those in the conventional control group (P < 0.05), indicating that the cabbage growth effect of only applying compound fertilizer is not ideal. The height and yield of the cabbage plants harvested in Example 5 were the highest, better than those in Comparative Example 1-2 groups (P < 0.05), proving that the fertilizer obtained by the present invention can effectively promote the growth of cabbage.

[0042] like Figure 2 As shown, the utilization rates of nitrogen, phosphorus and potassium in Example 5, Comparative Example 1 and Comparative Example 2 were all higher than those in the conventional control group (P<0.05), indicating that the utilization rates of nitrogen, phosphorus and potassium were not ideal if only compound fertilizer was applied. The utilization rates of nitrogen, phosphorus and potassium in Example 5 were the highest, better than those in Comparative Example 1-2 (P<0.05), proving that the fertilizer obtained by the present invention can effectively improve the utilization rate of each element.

[0043] like Figure 3 and Figure 4 As shown, the contents of organic matter, alkaline-hydrolyzed nitrogen, available phosphorus and available potassium in Example 5 group were the highest, which were better than those in the other groups (P < 0.05).

[0044] Based on the soil nutrients before planting, calculate the growth rate of soil nutrients after planting, such as Figure 5 As shown, the growth rate of each nutrient element in Example 5 group was the highest, which was better than that in the other groups (P < 0.05). This shows that the fertilizer obtained by the present invention can not only promote the growth of cabbage and improve the utilization rate of each element, but also improve soil fertility and avoid leaching of nutrient elements.

[0045] The applicant believes that this is because the present invention uses polysuccinimide and lysine to promote the ring opening of imide to form an amine group, which not only has good affinity with nitrogen fertilizers (especially urea), but also has extremely high mutual dispersion uniformity. At the same time, it can be dispersed with phosphate fertilizers and potash fertilizers, and the prefabricated material is coated on its surface. a After condensation reaction, not only the performance is stable, the stability of polyaspartic acid is greatly enhanced, and its sensitivity to the environment is reduced, but also it can be compounded with nitrification inhibitors to greatly enhance the absorption and utilization efficiency of nitrogen fertilizer. b Combined with bentonite, zeolite powder and sodium alginate, prefabricated b It is the inner layer particle, while bentonite and zeolite powder have a large number of voids. The inner layer particles will be adsorbed in the voids to form a double slow-release, reducing the overall fertilizer release rate of nitrogen, phosphorus and potassium, and further generating an in-situ calcium alginate coating layer on its surface, which can not only effectively enhance the stability of the particles and avoid the difficulty in controlling the fertilizer effect due to breakage, but also has excellent slow-release effect and can be released according to the laws of crops, with excellent control effect. One application can meet the needs of the crop throughout the entire growth period, has strong penetration into the soil, excellent water retention capacity, and has significant environmental benefits.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for improving fertilizer utilization by adding a synergist, characterized in that: The steps include: S1. Add chondroitin sulfate to deionized water, adjust the pH value of the system to 3-4, add potassium permanganate and stir for 1-4h, the stirring temperature is 30-40°C, adjust the pH value of the system to 6-6.5, and obtain a prefabricated material. a ; S2. Add polysuccinimide and lysine to N,N-dimethylformamide and stir at a temperature of 50-60°C until precipitation is complete. Collect the precipitate, add nitrogen fertilizer, phosphate fertilizer and potash fertilizer and stir for 10-30 minutes. Spray the prefabricated material into the mixture while stirring. a Continue stirring for 1-2 hours at a stirring temperature of 40-50°C and vacuum dry to obtain a preform b ; S3, prefabricated material b , nitrification inhibitor, bentonite, zeolite powder, sodium alginate, and composite trace elements are stirred for 1-2 hours, and calcium chloride solution is sprayed therein and granulated and dried.

2. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S1, the mass ratio of chondroitin sulfate to potassium permanganate is 1-3:1-3.

3. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S1, the pH value of the system is adjusted to 3-4 using hydrochloric acid with a concentration of 0.5-1.5 mol / L; In S1, disodium hydrogen phosphate-potassium dihydrogen phosphate buffer with a pH value of 5-8 is used to adjust the pH value of the system to 6-6.

5.

4. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S2, polysuccinimide, lysine, nitrogen fertilizer, phosphate fertilizer, potash fertilizer and prefabricated materials a The mass ratio is 5-10:1-2:50-100:10-30:5-15:25-50.

5. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S2, the nitrogen fertilizer is at least one of urea, ammonium chloride, ammonium sulfate, and ammonium bicarbonate.

6. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S2, the phosphate fertilizer is at least one of superphosphate, double superphosphate, monoammonium phosphate and diammonium phosphate.

7. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S2, the potash fertilizer is at least one of potassium sulfate, potassium chloride, potassium nitrate, and potassium dihydrogen phosphate.

8. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S3, the complex trace elements include at least one of magnesium sulfate, iron sulfate, borax, and calcium carbonate.

9. The method for improving fertilizer utilization by adding a synergist according to claim 1, characterized in that: In S3, the concentration of calcium chloride solution is 0.1-1 mol / L, and the prefabricated material b The mass ratio of nitrification inhibitor, bentonite, zeolite powder, sodium alginate, composite trace elements and calcium chloride solution is 20-40:1-2:5-15:1-5:1-5:0.3-3:5-10.

10. A compound fertilizer with high fertilizer utilization rate, characterized in that: The fertilizer is prepared by the method of adding a synergist to improve the utilization rate of fertilizer as described in any one of claims 1 to 9.

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