Fertilizer synergist based on n-rpc and method for its preparation

Abstract

The application discloses a fertilizer synergist based on NRPC and a preparation method thereof, and belongs to the technical field of fertilizers. The fertilizer synergist is composed of NRPC base masterbatch and functional additives, wherein the NRPC base masterbatch accounts for 70-90% of the total weight of the synergist, and the functional additives account for 10-30%; the functional additives include benzoic acid derivatives and traditional Chinese medicine raw materials, the benzoic acid derivatives are 2-((4-isopropylphenyl) aminocarbonyl) benzoic acid and 2-((2-bromophenyl) aminocarbonyl) benzoic acid, and the traditional Chinese medicine raw materials are Sophora alopecuroides, Acorus gramineus and Polygonum orientale. Test results show that the synergist can adjust the soil pH to a neutral suitable range, improve soil organic matter, and improve soil compaction and salinization; when applied to potatoes, the yield, the rate of commercial potatoes, the contents of dry matter, crude starch, vitamin C and protein can be significantly improved, the content of reducing sugar can be reduced, and the soil fertility, the fertilizer utilization rate and the crop yield and quality can be comprehensively improved.

Description

Technical Field

[0001] This application relates to the field of fertilizer technology, and in particular to NRPC-based fertilizer synergists and their preparation methods. Background Technology

[0002] In agricultural production, long-term excessive application of chemical fertilizers can easily lead to problems such as soil compaction, soil salinization, severe nutrient loss, and low fertilizer utilization. Currently, conventional chemical fertilizers generally suffer from the drawbacks of rapid nutrient release and large leaching losses. A large amount of nitrogen, phosphorus, and potassium nutrients cannot be fully absorbed by crops, which not only wastes fertilizer resources but also easily causes agricultural ecological pollution problems such as soil acidification and water eutrophication. Existing fertilizer enhancement products mostly use single inorganic adjuvants or single biological extracts, resulting in relatively limited functions and generally suffering from drawbacks such as weak soil improvement effects, easy fixation of trace elements by the soil, and poor absorption and translocation efficiency by crops. Commonly available enhancement agents lack a synergistic system combining organic modifiers and active ingredients from traditional Chinese medicine, failing to simultaneously achieve the comprehensive effects of soil improvement, slow nutrient release, root absorption promotion, and stress resistance enhancement. Furthermore, the current utilization rate of industrial solid waste resources is low; industrial solid wastes such as phosphogypsum and fly ash are mostly disposed of through landfill, which not only occupies land resources but also easily causes environmental pollution, failing to achieve rational resource utilization. Currently, some synergists use single chemically synthesized synergistic ingredients, which have poor biocompatibility and can easily damage the soil microbial community structure with long-term application. Meanwhile, pure traditional Chinese medicine synergists suffer from poor stability, slow onset of action, and insufficient nutrient supply. Benzoic acid derivatives have excellent plant growth regulating activity and penetration synergistic ability in agriculture. Traditional Chinese medicine raw materials contain natural alkaloids and flavonoid active substances, possessing the functions of promoting growth, resisting stress, inhibiting bacteria, and improving soil. However, there is currently no technology to combine specific ratios of benzoic acid derivatives with traditional Chinese medicine raw materials such as bitter bean, acorus calamus, and red knotweed, and then combine them with NRPC inorganic composite masterbatch to prepare fertilizer synergists.

[0003] Therefore, in response to the technical defects of existing technologies, such as low fertilizer utilization rate, poor soil improvement effect, low raw material resource utilization rate, and single synergistic component, this application proposes a fertilizer synergist based on NRPC and its preparation method. It utilizes industrial solid waste combined with trace elements, slow-release adjuvants, and chelating agents to construct a composite masterbatch, and combines benzoic acid derivatives with natural Chinese herbal medicine materials to form a functional additive. Through the synergistic effect of multiple components, it achieves the effects of slow nutrient release, soil improvement, improved crop absorption efficiency, and enhanced crop stress resistance. It has the advantages of low production cost, green and pollution-free, and high solid waste resource utilization rate, and is suitable for large-scale agricultural promotion and application. Summary of the Invention

[0004] The purpose of this application is to overcome the problems of low fertilizer utilization, poor soil improvement effect, low raw material resource utilization, and single synergistic components in the existing technology. This application proposes a fertilizer synergist based on NRPC and its preparation method. By using industrial solid waste combined with trace elements, slow-release adjuvants, and chelating agents to construct NRPC composite masterbatch, and combining it with benzoic acid derivatives in a specific ratio with natural Chinese medicinal materials such as bitter bean, acorus calamus, and red knotweed to form a functional additive, this application solves the problems of single function, low solid waste utilization, poor biocompatibility, and inability to achieve comprehensive synergistic effects in existing synergists.

[0005] This application proposes a fertilizer synergist based on NRPC, which includes NRPC base material and functional additives. The NRPC base material accounts for 70%-90% of the total weight of the synergist, and the functional additives include benzoic acid derivatives and traditional Chinese medicine raw materials.

[0006] Preferably, the benzoic acid derivative comprises 2-((4-isopropylphenyl)carbamoyl)benzoic acid and 2-((2-bromophenyl)carbamoyl)benzoic acid, wherein the mass ratio of 2-((4-isopropylphenyl)carbamoyl)benzoic acid to 2-((2-bromophenyl)carbamoyl)benzoic acid is 1:1.

[0007] Preferably, the medicinal materials include bitter bean, sweet flag and red knotweed, wherein the ratio of bitter bean, sweet flag and red knotweed is 2:1:1.

[0008] Preferably, the functional additive accounts for 10%-30% of the total weight of the synergist; the NRPC base masterbatch is composed of the following raw materials in parts by weight: 20-25 parts phosphogypsum, 10-12 parts fly ash, 14-18 parts urea, 6-8 parts ammonium molybdate, 10-12 parts potassium sulfate, 4-6 parts magnesium sulfate, 12-15 parts soil conditioner, 3-5 parts manganese sulfate, 2-4 parts zinc sulfate, 3-5 parts borax, 2-4 parts ferrous sulfate, 1-3 parts slow-release agent, 2-4 parts absorption promoter, and 1-3 parts synergistic chelating agent.

[0009] Preferably, the preparation method of 2-((4-isopropylphenyl)carbamoyl)benzoic acid is as follows: weigh 7.4g of phthalic anhydride and 6.75g of 4-isopropylaniline, add 100mL of acetonitrile, react at 55℃ for 4h, filter, and obtain 2-((4-isopropylphenyl)carbamoyl)benzoic acid.

[0010] Preferably, the preparation method of 2-((2-bromophenyl)carbamoyl)benzoic acid is as follows: weigh 7.4g of phthalic anhydride and 8.5g of 2-bromoaniline, add 100mL of ethanol, react at 40℃ for 4h, filter, and obtain 2-((2-bromophenyl)carbamoyl)benzoic acid.

[0011] Preferably, the slow-release agent is any one of lignin sulfonate or urea-formaldehyde resin; the soil conditioner is any one of bentonite or diatomaceous earth.

[0012] Preferably, the absorption promoter is at least one of betaine or sugar alcohol.

[0013] Preferably, the synergistic chelating agent is either disodium EDTA or humic acid.

[0014] This application also discloses a method for preparing a fertilizer synergist based on NRPC, the method comprising: (1) Preparation of NRPC base masterbatch: Weigh out phosphogypsum, fly ash, urea, ammonium molybdate, potassium sulfate, magnesium sulfate, soil conditioner, manganese sulfate, zinc sulfate, borax, ferrous sulfate, slow release agent, absorption promoter, and synergistic chelating agent according to the weight parts. Stir at room temperature at a speed of 200-300 r / min. After mixing evenly, grind through an 80-100 mesh sieve to obtain NRPC base masterbatch. (2) Pretreatment of Chinese medicinal materials: Select bitter bean seeds, acorus calamus and red knotweed according to the proportion, wash and remove impurities, dry them, pulverize them through a 100-120 mesh sieve, and mix them evenly to obtain Chinese medicinal material powder; (3) Preparation of benzoic acid derivatives: 2-((4-isopropylphenyl)carbamoyl)benzoic acid and 2-((2-bromophenyl)carbamoyl)benzoic acid were prepared separately and mixed at a mass ratio of 1:1 to obtain a mixture of benzoic acid derivatives; (4) Functional additive compounding: Mix the Chinese herbal raw material powder obtained in step (2) with the benzoic acid derivative mixture obtained in step (3) for 20-30 minutes to obtain functional additives; (5) Finished product compounding: According to the weight ratio, the NRPC base masterbatch and functional additives are stirred at room temperature in a closed container at a speed of 250-350 r / min to fully mix them and obtain the fertilizer synergist based on NRPC.

[0015] The beneficial effects of the embodiments in this application are as follows: (1) NRPC basic masterbatch is constructed using phosphogypsum and fly ash as the main raw materials. It is combined with slow-release agent to form a porous network carrier structure, which can physically adsorb and encapsulate nitrogen, phosphorus and potassium nutrients, delaying the rapid dissolution and leaching loss of nutrients; at the same time, it realizes the high-value utilization of industrial solid waste, reduces production costs and avoids solid waste landfill pollution.

[0016] (2) The chelating agent can form a stable chelate with trace elements such as manganese, zinc, iron and boron in the soil, preventing trace elements from being fixed by soil colloids and improving their mobility and effectiveness; when combined with the absorption promoter, it opens up the absorption channels of crop roots and significantly improves the efficiency of nutrient transport and utilization.

[0017] (3) Two specific benzoic acid derivatives can regulate the permeability of crop cell membranes, enhance the ability of nutrient penetration and absorption, and play a role in regulating plant growth. The compound Chinese medicinal materials of bitter bean, sweet flag and red knotweed contain natural alkaloids and flavonoid active substances, which can inhibit harmful bacteria in the soil, optimize the microbial community, and have the effects of promoting root growth and seedlings and enhancing crop resistance.

[0018] (4) Soil conditioners can improve soil aggregate structure, reduce compaction, and, in conjunction with the buffering effect of medicinal herb materials and NRPC masterbatch, adjust the pH of saline-alkali soil to a suitable neutral range, increase soil organic matter content and water and fertilizer retention capacity, and restore degraded soil ecology. They provide stable and balanced nutrients for crops throughout their entire growth period, promote the accumulation of tubers and dry matter, improve yield, marketability, and nutritional quality of starch and vitamin C, and reduce reducing sugar content, thus meeting the standards for high-quality agricultural products. Attached Figure Description

[0019] Figure 1 This is a diagram of the potato characteristics in Example 1 of the experimental examples in this application. Detailed Implementation

[0020] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] In the following examples, phthalic anhydride, 4-isopropylaniline, 2-bromoaniline, ethanol, and acetonitrile were purchased from Sinopharm Group; bitter bean, acorus calamus, and red knotweed were purchased from Shaanxi Sinotech Biotechnology Co., Ltd.; organic-inorganic compound fertilizer (N+P2O5+K2O≥15.0%, organic matter≥20.0%) was purchased from Huanglong County Agricultural Trade Market; and other reagents and equipment not specified were conventional and commercially available.

[0022] Preparation Example 1 Preparation of benzoic acid derivatives (1) Preparation of 2-((4-isopropylphenyl)carbamoyl)benzoic acid: Weigh 7.4 g (50 mmol) of phthalic anhydride and 6.75 g (50 mmol) of 4-isopropylaniline into a 250 mL three-necked flask, then add 100 mL of acetonitrile, put the flask into a rotor and connect a condenser, and react at 55 °C for 4 h. After the reaction is complete, filter to obtain 12.95 g of grayish-white powder of 2-((4-isopropylphenyl)carbamoyl)benzoic acid.

[0023] (2) Preparation of 2-((2-bromophenyl)carbamoyl)benzoic acid: Weigh 7.4 g (50 mmol) of phthalic anhydride and 8.5 g (50 mmol) of 2-bromoaniline into a 250 mL three-necked flask, then add 100 mL of ethanol, put the flask into a rotor and connect a condenser, and react at 40 °C for 4 h. After the reaction is complete, filter to obtain 14.56 g of grayish-white powder of 2-((2-bromophenyl)carbamoyl)benzoic acid.

[0024] (3) Preparation of benzoic acid derivative mixture: Take 5g of the 2-((4-isopropylphenyl)carbamoyl)benzoic acid prepared above and mix it with 5g of 2-((2-bromophenyl)carbamoyl)benzoic acid (mass ratio 1:1), stir evenly, and obtain a benzoic acid derivative mixture.

[0025] Preparation Example 2 Preparation of functional additives (1) Preparation of Chinese herbal medicine powder: Weigh out 10g of bitter bean seeds, 5g of acorus calamus, and 5g of polygonum hydropiper according to a mass ratio of 2:1:1. Place them in a clean container and rinse them repeatedly with deionized water three times to thoroughly remove mud, dust, and other impurities adhering to the surface of the raw materials. After rinsing, spread the raw materials evenly on a clean enamel tray and place them in an electric thermostatic drying oven. Set the temperature to 60℃ and the drying time to 6 hours until the raw materials are completely dried to a constant weight. After cooling to room temperature, put the dried raw materials into a high-speed universal pulverizer for pulverization. After pulverization, pass the powder through a 100-mesh pharmacopoeia sieve. Return the coarse powder on the sieve to the pulverizer for secondary pulverization to ensure that all powder passes through a 100-120-mesh sieve. Place the sieved bitter bean powder, acorus calamus powder, and polygonum hydropiper powder in a clean mixing container and stir at 200 rpm for 15 minutes to mix evenly. Obtain the raw material powder of traditional Chinese medicine and seal it in a desiccator for later use.

[0026] (2) Preparation of functional additives: Take the benzoic acid derivative mixture prepared in Preparation Example 1 and the Chinese herbal medicine powder obtained in step (1) above, weigh 10g of each at a mass ratio of 1:1. Add the two materials to a closed mixing vessel simultaneously, close the vessel lid, set the stirring speed to 250r / min, and stir for 25min at room temperature and pressure. When the materials are mixed evenly, without lumps or stratification, discharge the material and sieve it through an 80-mesh sieve to remove impurities, and obtain the functional additive. Seal and store it in the dark for later use.

[0027] Example 1 NRPC-based fertilizer synergists (1) Raw material composition: The fertilizer synergist based on NRPC is composed of NRPC base material and functional additives in a weight ratio of 80:20; by weight: 22 parts phosphogypsum, 11 parts fly ash, 16 parts urea, 7 parts ammonium molybdate, 11 parts potassium sulfate, 5 parts magnesium sulfate, 13 parts bentonite, 4 parts manganese sulfate, 3 parts zinc sulfate, 4 parts borax, 3 parts ferrous sulfate, 2 parts lignin sulfonate, 3 parts betaine, 2 parts disodium EDTA, and 20 parts functional additives from Preparation Example 2.

[0028] (2) Preparation method 1) Preparation of NRPC base masterbatch: Weigh out phosphogypsum, fly ash, urea, ammonium molybdate, potassium sulfate, magnesium sulfate, bentonite, manganese sulfate, zinc sulfate, borax, ferrous sulfate, lignin sulfonate, betaine, and disodium EDTA by weight. Stir at 250 r / min for 30 min at room temperature. After mixing evenly, grind through a 100-mesh sieve to obtain NRPC base masterbatch.

[0029] 2) Finished product compounding: Mix the NRPC base masterbatch and functional additives at 300r / min for 40min under room temperature and sealed conditions to obtain NRPC-based fertilizer synergist.

[0030] Example 2 NRPC-based fertilizer synergists (1) Raw material composition: The fertilizer synergist based on NRPC is composed of NRPC base material and functional additives in a weight ratio of 70:30; 20 parts of phosphogypsum, 10 parts of fly ash, 14 parts of urea, 6 parts of ammonium molybdate, 10 parts of potassium sulfate, 4 parts of magnesium sulfate, 12 parts of diatomaceous earth, 3 parts of manganese sulfate, 2 parts of zinc sulfate, 3 parts of borax, 2 parts of ferrous sulfate, 1 part of urea-formaldehyde resin, 2 parts of sugar alcohol, 1 part of humic acid, and 30 parts of functional additives prepared in Example 2 are weighed by weight.

[0031] (2) Preparation method 1) Preparation of NRPC base masterbatch: Weigh each raw material according to the weight parts, stir at 200r / min for 40min at room temperature, grind evenly and pass through an 80-mesh sieve to obtain NRPC base masterbatch.

[0032] 2) Finished product compounding: Mix the NRPC base masterbatch and functional additives at 350 r / min for 30 min under room temperature and sealed conditions to obtain NRPC-based fertilizer synergist.

[0033] Example 3 NRPC-based fertilizer synergists (1) Raw material composition: The fertilizer synergist based on NRPC is composed of NRPC base material and functional additives in a weight ratio of 90:10; weigh out 25 parts of phosphogypsum, 12 parts of fly ash, 18 parts of urea, 8 parts of ammonium molybdate, 12 parts of potassium sulfate, 6 parts of magnesium sulfate, 15 parts of bentonite, 5 parts of manganese sulfate, 4 parts of zinc sulfate, 5 parts of borax, 4 parts of ferrous sulfate, 3 parts of lignin sulfonate, 4 parts of a mixture of betaine and sugar alcohol (4 parts each of betaine and sugar alcohol), and 3 parts of disodium EDTA.

[0034] (2) Preparation method: 1) Preparation of NRPC base masterbatch: Weigh each raw material according to the weight parts, stir at 300r / min for 25min at room temperature, grind evenly and pass through a 100-mesh sieve to obtain NRPC base masterbatch.

[0035] 2) Finished product compounding: Mix the NRPC base masterbatch and functional additives at 250 r / min for 45 min under room temperature and sealed conditions to obtain NRPC-based fertilizer synergist.

[0036] Comparative Example 1 NRPC fertilizer (1) Raw material composition: Weigh out 20 parts of phosphogypsum, 10 parts of fly ash, 14 parts of urea, 6 parts of ammonium molybdate, 10 parts of potassium sulfate, 4 parts of magnesium sulfate, 12 parts of diatomaceous earth, 3 parts of manganese sulfate, 2 parts of zinc sulfate, 3 parts of borax, 2 parts of ferrous sulfate, 1 part of urea-formaldehyde resin, 2 parts of sugar alcohol, and 1 part of humic acid by weight.

[0037] (2) Preparation method: Preparation of NRPC base masterbatch: Weigh each raw material according to the weight parts, stir at 200r / min for 40min at room temperature, grind evenly and pass through an 80-mesh sieve to obtain NRPC fertilizer.

[0038] Comparative Example 2 NRPC-based fertilizer for enhancing the efficacy of traditional Chinese medicine (1) Raw material composition: Weigh out 20 parts of phosphogypsum, 10 parts of fly ash, 14 parts of urea, 6 parts of ammonium molybdate, 10 parts of potassium sulfate, 4 parts of magnesium sulfate, 12 parts of diatomaceous earth, 3 parts of manganese sulfate, 2 parts of zinc sulfate, 3 parts of borax, 2 parts of ferrous sulfate, 1 part of urea-formaldehyde resin, 2 parts of sugar alcohol, and 1 part of humic acid by weight.

[0039] (2) Preparation method: 1) Preparation of NRPC base masterbatch: Weigh each raw material according to the weight parts, stir at 200r / min for 40min at room temperature, grind evenly and pass through an 80-mesh sieve to obtain NRPC fertilizer.

[0040] 2) Preparation of raw material powder of traditional Chinese medicine: Weigh 10g of bitter bean seed, 5g of acorus tatarinowii and 5g of red knotweed in a mass ratio of 2:1:1, place them in a clean container, and rinse them repeatedly with deionized water 3 times to thoroughly remove the mud, sand, dust and other impurities attached to the surface of the raw materials; after rinsing, spread the raw materials evenly on a clean enamel tray and place them in an electric constant temperature drying oven, set the temperature to 60℃ and the drying time to 6h, until the raw materials are completely dried to constant weight; after cooling to room temperature, put the dried raw materials into a high-speed universal pulverizer for pulverization, and pass them through a 100-mesh pharmacopoeia sieve. The coarse powder on the sieve is returned to the pulverizer for secondary pulverization to ensure that all powder passes through a 100-120 mesh sieve; place the sieved bitter bean seed powder, acorus tatarinowii powder and red knotweed powder in a clean mixing container, stir at 200r / min for 15min, mix evenly to obtain raw material powder of traditional Chinese medicine, seal and place in a desiccator for later use.

[0041] 3) Finished product compounding: Mix the NRPC base masterbatch with the Chinese herbal medicine powder at 250 r / min for 45 min under room temperature and sealed conditions to obtain NRPC-based Chinese herbal medicine enhanced fertilizer.

[0042] Test case Application effect test (1) Test sites: Liangjiahe Village, Wen'anyi Town, Yanchuan County, Shaanxi Province; Guzui Village, Fengqi Subdistrict Office, Luochuan County, Shaanxi Province; and Liangjiahe Village, Shibao Town, Huanglong County, Shaanxi Province, with elevations of 2336m, 1817m and 2102m respectively; the soil type tested was loess.

[0043] (2) Experimental materials: The potato varieties tested were Jizhangshu No. 12, Longshu No. 7 and Qingshu No. 9, which were provided by Dingxi Agricultural Technology Extension Station for field trials; Examples 1, 2, and 3 of this application, Comparative Example 1 and Comparative Example 2, and commercially available organic-inorganic compound fertilizer.

[0044] (3) Experimental Design: Effects of Different Fertilization Programs on Potato Quality The experiment consisted of 6 treatments: Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and commercially available organic-inorganic compound fertilizer. Each treatment was replicated 3 times, for a total of 18 plots, each plot being approximately 20 m². 2 The experiment was conducted in Huanglong County on April 20, 2023, using the Jizhangshu 12 variety. The potatoes were planted using a full-film mulching and hole-planting cultivation technique, with a row width of 1.0 m, row spacing of 0.6 m, and plant spacing of 0.3 m. To reduce differences between groups, the basic soil fertility level, seeding rate, and field management measures were kept identical across the experimental sites. Harvesting took place in mid-October 2023.

[0045] (4) Measurement content and methods 1) Sample collection: Potato plants were collected from three experimental sites in Yanchuan County, Luochuan County and Huanglong County during the harvest period to determine yield and quality. At the same time, rhizosphere soil was collected and placed in self-sealing bags for soil physicochemical property determination.

[0046] 2) Determination of soil physicochemical indicators: After the soil sealed in a self-sealing bag was air-dried, it was passed through a 60-mesh sieve. The pH value was measured using a pH meter. Organic matter was determined using the potassium dichromate oxidation-external heating method. Total nitrogen was determined using the Kjeldahl method. Alkali available nitrogen was determined using the alkaline diffusion method. Available phosphorus was determined using the molybdenum antimony colorimetric method. Available potassium was determined using the ammonium acetate extraction-flame photometric method.

[0047] 3) Potato yield indicators determination: Large potatoes refer to tubers weighing more than 65 g each, and small potatoes refer to tubers weighing less than 65 g each. Statistics and calculations are performed on indicators such as yield per plant, number of tubers per plant, and marketable yield. Marketable yield (%) = Number of large potatoes / (Number of large potatoes + Number of small potatoes) × 100; Yield per plant = Measured yield weight / Number of plants measured; Number of tubers per plant = (Number of large potatoes + Number of small potatoes) / Number of plants measured; Equivalent yield = Measured yield weight / Measured yield area × 10,000.

[0048] 4) Determination of potato quality indicators: Dry matter was determined by direct drying method, protein was determined by Kjeldahl nitrogen determination method, crude starch was determined by optical rotation method, vitamin C was determined by fluorescence method, and reducing sugar was determined by direct titration method.

[0049] (4) Test Results 1) Results of Improved Soil Physicochemical Properties: After applying the NRPC-based fertilizer synergist of this application (Examples 1, 2, and 3), the physicochemical properties of the loess rhizosphere soil were significantly improved, superior to Comparative Examples 1 and 2 and the commercially available organic-inorganic compound fertilizer group. Specifically: Soil pH: The initial alkaline pH (8.2-8.5) was adjusted to a neutral-to-suitable range (pH 7.3-7.6), alleviating soil salinization; the pH of Comparative Examples 1, 2, and the commercially available organic-inorganic compound fertilizer group was 7.8-8.0. Soil Organic Matter: Soil aggregate structure was improved, and compaction was significantly reduced. Soil Nutrients: The contents of total nitrogen, available nitrogen, available phosphorus, and available potassium increased by 12.2%-19.7%, 15.6%-23.1%, 20.3%-28.5%, and 16.8%-24.2%, respectively, significantly enhancing nutrient supply capacity, all superior to the comparative examples. Example 1 showed the best results, with the greatest improvement in overall soil fertility; Comparative Examples 1 and 2 showed only 50% to 70% of the soil improvement effects of Example 1, and the commercially available fertilizer group had no significant soil improvement effect.

[0050] 2) Potato Yield and Marketability Results: Yield per unit area: Examples 1, 2, and 3 showed yield increases of 28.6%, 23.4%, and 19.7% compared to the commercially available fertilizer group, respectively; increases of 22.3%, 17.5%, and 13.8% compared to Control Example 1, respectively; and increases of 17.6%, 12.9%, and 9.4% compared to Control Example 2, respectively. Marketability: Example 1 had a marketability rate of 89.2%, Example 2 85.7%, and Example 3 82.3%; the commercially available fertilizer group had a rate of only 71.5%, Control Example 1 76.8%, and Control Example 2 80.1%. Yield per plant and number of tubers: Example 1 showed a 31.2% increase in yield per plant compared to the commercially available group, with 2-3 more tubers per plant, the highest proportion of large tubers, uniform tuber size, and low deformity rate. Figure 1 As shown.

[0051] 3) Results of potato quality indicators: After applying the synergist of this application, the nutritional quality of potatoes was comprehensively improved: Crude starch content: 17.8% in Example 1, 16.9% in Example 2, and 16.2% in Example 3; the commercial group was only 13.5%, showing a significant increase in starch content; Vitamin C content: increased by 25.6%~32.8% compared to the commercial group, with richer antioxidant nutrients; Dry matter content increased by 10.3%~15.7%, and protein content increased by 8.9%~12.4%, resulting in higher nutrient density of potatoes; The reducing sugar content of Examples 1, 2, and 3 remained at a low level of 0.25%~0.32%, meeting the standards for high-quality potato processing and consumption.

[0052] In summary, the NRPC-based fertilizer synergist provided in this application uses industrial solid waste phosphogypsum and fly ash as core raw materials to prepare NRPC masterbatch, and combines it with a specific ratio of benzoic acid derivatives and medicinal materials from bitter bean, sweet flag, and red knotweed to form functional additives. Through the synergistic effect of multiple components, it can effectively delay the release of fertilizer nutrients, improve the absorption and utilization rate of crop nutrients, significantly improve the physical and chemical properties of soil, alleviate soil compaction and salinization problems, and enhance soil fertility. Field trials show that when applied to potato planting, it can increase yield by 19.7%~28.6%, increase the marketable rate to 82.3%~89.2%, and optimize the nutritional quality of potato crude starch, vitamin C, protein, etc., while reducing the reducing sugar content.

[0053] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application. All equivalent changes and improvements made within the scope of this application shall still fall within the patent coverage of this application.

Claims

1. A fertilizer synergist based on NRPC, characterized in that, The fertilizer synergist includes NRPC base masterbatch and functional additives, wherein the NRPC base masterbatch accounts for 70%-90% of the total weight of the synergist, and the functional additives include benzoic acid derivatives and traditional Chinese medicine raw materials.

2. The fertilizer synergist based on NRPC as described in claim 1, characterized in that, The benzoic acid derivatives include 2-((4-isopropylphenyl)carbamoyl)benzoic acid and 2-((2-bromophenyl)carbamoyl)benzoic acid. The acid, wherein the mass ratio of 2-((4-isopropylphenyl)carbamoyl)benzoic acid to 2-((2-bromophenyl)carbamoyl)benzoic acid is 1:

1.

3. The fertilizer synergist based on NRPC as described in claim 1, characterized in that, The medicinal materials include bitter bean seeds, acorus calamus, and red knotweed, wherein the ratio of bitter bean seeds, acorus calamus, and red knotweed is 2:1:

1.

4. The fertilizer synergist based on NRPC as described in claim 1, characterized in that, The functional additives account for 10%-30% of the total weight of the synergist; the NRPC base masterbatch is composed of the following raw materials in parts by weight: 20-25 parts phosphogypsum, 10-12 parts fly ash, 14-18 parts urea, 6-8 parts ammonium molybdate, 10-12 parts potassium sulfate, 4-6 parts magnesium sulfate, 12-15 parts soil conditioner, 3-5 parts manganese sulfate, 2-4 parts zinc sulfate, 3-5 parts borax, 2-4 parts ferrous sulfate, 1-3 parts slow-release agent, 2-4 parts absorption promoter, and 1-3 parts synergistic chelating agent.

5. The fertilizer synergist based on NRPC as described in claim 2, characterized in that, The preparation method of 2-((4-isopropylphenyl)carbamoyl)benzoic acid is as follows: 7.4g of phthalic anhydride and 6.75g of 4-isopropylaniline are weighed, 100mL of acetonitrile is added, the mixture is reacted at 55℃ for 4h, and then filtered to obtain 2-((4-isopropylphenyl)carbamoyl)benzoic acid.

6. The fertilizer synergist based on NRPC as described in claim 2, characterized in that, The preparation method of 2-((2-bromophenyl)carbamoyl)benzoic acid is as follows: 7.4g of phthalic anhydride and 8.5g of 2-bromoaniline are weighed, 100mL of ethanol is added, the mixture is reacted at 40℃ for 4h, and then filtered to obtain 2-((2-bromophenyl)carbamoyl)benzoic acid.

7. The fertilizer synergist based on NRPC as described in claim 4, characterized in that, The slow-release agent is either lignin sulfonate or urea-formaldehyde resin; the soil conditioner is either bentonite or diatomaceous earth.

8. The fertilizer synergist based on NRPC as described in claim 4, characterized in that, The absorption enhancer is at least one of betaine or sugar alcohol.

9. The fertilizer synergist based on NRPC as described in claim 4, characterized in that, The synergistic chelating agent is either disodium EDTA or humic acid.

10. The method for preparing the NRPC-based fertilizer synergist as described in any one of claims 1-9, characterized in that, The preparation method includes: (1) Preparation of NRPC base masterbatch: Weigh out phosphogypsum, fly ash, urea, ammonium molybdate, potassium sulfate, magnesium sulfate, soil conditioner, manganese sulfate, zinc sulfate, borax, ferrous sulfate, slow release agent, absorption promoter, and synergistic chelating agent according to the weight parts. Stir at room temperature at a speed of 200-300 r / min. After mixing evenly, grind through an 80-100 mesh sieve to obtain NRPC base masterbatch. (2) Pretreatment of Chinese medicinal materials: Select bitter bean seeds, acorus calamus and red knotweed according to the proportion, wash and remove impurities, dry them, pulverize them through a 100-120 mesh sieve, and mix them evenly to obtain Chinese medicinal material powder; (3) Preparation of benzoic acid derivatives: 2-((4-isopropylphenyl)carbamoyl)benzoic acid and 2-((2-bromophenyl)carbamoyl)benzoic acid were prepared according to the methods of claims 5 and 6 respectively, and mixed at a mass ratio of 1:1 to obtain a mixture of benzoic acid derivatives; (4) Functional additive compounding: Mix the Chinese herbal raw material powder obtained in step (2) with the benzoic acid derivative mixture obtained in step (3) for 20-30 minutes to obtain functional additives; (5) Finished product compounding: According to the weight ratio, the NRPC base masterbatch and functional additives are stirred at room temperature in a closed container at a speed of 250-350 r / min to fully mix them and obtain the fertilizer synergist based on NRPC.

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