Non-salt solid butyldiglycol ester fertilizer synergist, preparation method and application thereof

Abstract

The application belongs to the technical field of fertilizer synergist, and particularly relates to a non-salt solid butachlor fertilizer synergist, a preparation method and application. N , N '‑bis(3‑pyridine carboxamide)‑1,2‑cyclohexane]·[2,5‑dihydroxy terephthalic acid]. The application aims to solidify the butachlor fertilizer synergist product, and simultaneously add a new eutectic fertilizer synergist, so that the added value and use effect of the butachlor product in promoting growth and resisting low temperature can be further improved, and a new research direction is provided for the development and use of functional fertilizer new technology.

Description

Technical Field

[0001] This invention belongs to the field of fertilizer synergist technology, specifically relating to a non-salt-forming solid butyl diester fertilizer synergist, its preparation method, and its application. Adding it to fertilizer can significantly promote the root growth of garlic and corn, promote plant growth, increase the plant height and total net weight of corn plants, significantly increase the total fresh weight of spinach plants, further reduce the amount of fertilizer used, and improve fertilizer utilization. Background Technology

[0002] As we all know, fertilizers play an irreplaceable role in ensuring global food security, but the problems of excessive application and inefficient use of traditional fertilizers are becoming increasingly prominent. Fertilizer synergists, as a key technology for improving fertilizer utilization and reducing nutrient loss, are undergoing a significant transformation from traditional synergists to diversified and green technologies. Currently, the development of fertilizer synergists is shifting from single-function to multi-functional integration. In the future, it is necessary to further explore their mechanisms of action, optimize application technology systems, and improve industry standards to promote the efficient, healthy, and sustainable development of green agriculture.

[0003] Di(diethylaminoethanol) succinate, or simply dibutyl diester, is widely used in compound fertilizers, water-soluble fertilizers, and microbial fertilizers to significantly improve fertilizer utilization and effectively address phytotoxicity caused by excessive pesticide application. At room temperature, dibutyl diester is an oily liquid, and its addition to solid fertilizers presents challenges such as uneven distribution and difficulty in application. Current solid dibutyl diester formulations typically involve the interaction of di(diethylaminoethanol) succinate and citric acid to form citrate, thus transforming the formulation from liquid to solid. However, the introduction of citric acid makes it difficult to compound the product with alkaline fertilizers, and the benefits of citric acid to crops are not significant; it is merely added as a carrier for dibutyl diester, leading to reduced growth-promoting efficacy and lower content. Therefore, developing novel solidification technologies for dibutyl diester to overcome the transformation from crude to solid formulation, developing synergistic compounding technologies, and improving the utilization rate of dibutyl diester in fertilizers are urgently needed. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a non-salt-forming solid butyl diester fertilizer synergist, its preparation method, and its application. The aim is to innovate the solidification of butyl diester fertilizer synergist products, while simultaneously adding a novel eutectic fertilizer synergist. Through gentle spraying technology, boiling drying, and airflow pulverization, the butyl diester is uniformly solidified, effectively reducing the compounding temperature. This further enhances the added value and performance of butyl diester products with growth-promoting and low-temperature-resistant properties.

[0005] This invention is achieved by providing a non-salt-forming solid butyl diester fertilizer synergist, which, by weight, comprises the following raw materials: 50-100 parts of eutectic synergist, 250-400 parts of butyl diester, 150-250 parts of polyethylene glycol, 150-250 parts of plant protein, and 150-250 parts of small molecule peptides.

[0006] Preferably, the eutectic synergist is [ N , N '-Bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid], with the molecular formula C 26 H 26 N4O8 belongs to the triclinic crystal system. P The -1 space group has the following structure: .

[0007] Further preferably, in the eutectic synergist, the bond length of CC ranges from 1.369(3) to 1.533(3) Å, the bond length of CN ranges from 1.326(3) to 1.457(2) Å, the bond length of CO ranges from 1.223(2) to 1.364(2) Å, and the bond angle of CNC ranges from 118.23(18) to 125.32(16). o The bond angle range of CCC is 110.97(19)-122.51(16). o .

[0008] Preferably, the butyric acid diester is bis(diethylaminoethanol) succinate prepared by esterification of succinic acid and diethylaminoethanol, with the molecular formula C2. 16 H 32 N2O4, structural formula as follows: ; The plant protein is either soybean hydrolysate or corn hydrolysate, and the small molecule peptide is either soybean hydrolysate or corn hydrolysate.

[0009] This invention also provides a method for preparing the non-salt-forming solid butyl diester fertilizer synergist, wherein the eutectic synergist, the polyethylene glycol, the plant protein and the small molecule peptide are weighed according to the weight parts, thoroughly mixed evenly, and then the butyl diester is solidified into the above mixture by a soft spraying technology. Finally, the non-salt-forming solid butyl diester fertilizer synergist is obtained by a fluidized bed drying and air jet milling process.

[0010] Further preferably, the preparation method of the eutectic synergist includes the following steps: 1) with N , NUsing '-bis(3-pyridinecarboxamide)-1,2-cyclohexane and 2,5-dihydroxyterephthalic acid as raw materials, in a certain molar ratio, with water as solvent, the pH was adjusted to 8, and the mixture was heated to reflux at a certain temperature for a period of time. 2) Filter and dry for a certain period of time to obtain [ N , N '-Bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid], i.e., eutectic synergist.

[0011] Further preferably, in step 1), N , N The molar ratio of '-bis(3-pyridinecarboxamide)-1,2-cyclohexane and 2,5-dihydroxyterephthalic acid is 1:1–3; the pH is adjusted to 8 using sodium hydroxide, the reaction temperature is 90–100℃, and the reaction time is 1–2 h; in step 2), the filtration time is 0.5–1 h; the drying temperature is 85–90℃, and the drying time is 1–2 h.

[0012] Further optimization involves a boiling drying temperature of 50–80℃ and a time of 10–30 min; and an air jet milling time of 5–10 min.

[0013] The present invention also provides a method for applying the non-salt-forming solid butyl diester fertilizer synergist, specifically, the non-salt-forming solid butyl diester fertilizer synergist is applied by drip irrigation or fertigation at a rate of 40–80 g / mu; or by spraying at a rate of 4–10 g / mu.

[0014] This invention also provides an application of the aforementioned non-salt-forming solid butyl diester fertilizer synergist, specifically, adding the non-salt-forming solid butyl diester fertilizer synergist to water-soluble fertilizer or compound fertilizer and using it throughout the entire crop growth cycle; the plant is garlic, corn, or spinach.

[0015] Compared with the prior art, the advantages of the present invention are as follows: This invention first employs an organic chemical synthesis method, using water as a solvent in a reflux reaction to prepare a eutectic synergist. No byproducts are produced during the reaction, the solvent water can be reused multiple times, and no waste liquid is generated. The yield of the eutectic synergist is high. Further, a compound of the eutectic synergist, polyethylene glycol, plant protein, and small molecule peptides is used. The plant protein and small molecule peptides exhibit good stress resistance, further enhancing the product's stress resistance, resulting in a rational product formulation. Using soft spray technology, fluidized bed drying, and air jet milling, butyrate is uniformly solidified into the above formulation. This process offers advantages such as low curing temperature, spatial confinement, continuous process, simple operation, low production cost, good product stability and dispersibility, and stable curing. The non-salt-forming butyrate solid prepared by this invention has good water solubility, is widely compatible with various fertilizers, effectively improves fertilizer utilization, and promotes crop growth. The production process is simple, and the product has high economic benefits and application promotion value. Attached Figure Description

[0016] Figure 1 The eutectic synergist prepared in Example 1 [ N , N Single crystal structure diagram of '-bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid]; Figure 2 The eutectic synergist prepared in Example 1 [ N , N Two-dimensional supramolecular structure of '-bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid]. Detailed Implementation

[0017] 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 for illustrative purposes only and are not intended to limit the invention.

[0018] Example 1 (a) Eutectic Synergist [ N , N Preparation method of '-bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid] Weigh out 32.44 g (0.1 mol) of... N , N '-Bis(3-pyridinecarboxamide)-1,2-cyclohexane and 19.81 g (0.1 mol) of 2,5-dihydroxyterephthalic acid were placed in a 500 mL round-bottom flask, followed by the addition of 100 mL of deionized water. The pH was adjusted to 8.95 using sodium hydroxide. o The reaction was carried out at a constant temperature of 85°C for 1.5 hours. After the reaction was completed and the mixture was cooled, it was filtered for 1 hour.o After drying at C for 1 h, 50.83 g of a pale yellow powder was obtained, with a yield of 97.28%. 0.10 g of the above pale yellow powder was weighed and dissolved in 10 mL of a mixture of dichloromethane and methanol (volume ratio 1:1). Pale yellow blocky crystals were obtained by solvent evaporation for later use.

[0019] (ii) Eutectic Synergist [ N , N Determination of the single crystal structure of '-bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid]: The above-mentioned pale yellow blocky crystals were monochromated using a Bruker D8 X-ray diffractometer with graphite monochromatization of Mo Kα ( λ =0.71073 Å) radiation was used as the diffraction source to collect diffraction intensity data of the single crystal. The data was reduced to obtain the eutectic synergist [ N , N The structure of '-bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid] is as follows: Figure 1 As shown. The molecular formula of this compound is C2. 26 H 26 N4O8 belongs to the triclinic crystal system. P Space group –1. Specific single-crystal data are shown in Table 1. In this compound, the C–C bond length ranges from 1.369(3)–1.533(3) Å, the C–N bond length ranges from 1.326(3)–1.457(2) Å, the C–O bond length ranges from 1.223(2)–1.364(2) Å, and the C–N–C bond angle ranges from 118.23(18)–125.32(16). o The bond angles of C–C–C range from 110.97 (19) to 122.51 (16). o The specific bond length and bond angle data are shown in Table 2.

[0020] Table 1. Crystallographic Data of Eutectic Synergists <![CDATA[molecule of the compound Mode > <![CDATA[C 26 H 26 N4O8]]> molecular weight of the compound 522.51 Test temperature (K) of the compound 296 Crystal system of compounds Three obliques Space group of compounds –1 / Å 8.9849(13) / Å 11.0534(14) / Å 13.2199(18) / ° 73.662(4) / ° 81.728(5) / ° 78.897(4) <![CDATA[Volume of the compound (Å 3 )]]> 1230.7(3) <![CDATA[Theoretical density of the compound (g cm -3 )]]> 1.410 <![CDATA[linear absorption coefficient of unit cell (mm -1 )]]> 0.106 Number of electrons in a unit cell 548 Equivalent point average standard error 0.0363 S-value for observable diffraction points 1.037 R1 value for observing diffraction points 0.0592 R² value for all diffraction points 0.1995 Table 2 Bond lengths and bond angles of eutectic synergists O(2)–C(13) 1.223(2) C(3)–C(4) 1.381(3) O(1)–C(6) 1.228(2) C(14)–C(18) 1.383(2) O(5)–C(19) 1.231(2) C(20)–C(22)#1 1.385(3) O(7)–C(27) 1.232(2) C(21)–C(22) 1.385(3) O(4)–C(19) 1.279(2) C(22)–C(20)#1 1.385(3) O(8)–C(27) 1.304(3) C(4)–C(5) 1.386(3) O(3)–C(21) 1.359(2) C(24)–C(25) 1.388(3) O(6)–C(25) 1.364(2) C(24)–C(26)#2 1.394(2) N(2)–C(17) 1.326(3) C(26)–C(24)#2 1.394(2) N(4)–C(13) 1.333(2) C(20)–C(21) 1.394(3) N(2)–C(18) 1.334(2) C(25)–C(26) 1.397(3) N(1)–C(5) 1.335(2) C(19)–C(20) 1.486(2) N(1)–C(1) 1.338(3) C(26)–C(27) 1.489(3) N(3)–C(6) 1.340(2) C(4)–C(6) 1.495(3) N(4)–C(12) 1.456(2) C(13)–C(14) 1.500(2) N(3)–C(7) 1.457(2) C(8)–C(9) 1.511(3) C(16)–C(17) 1.369(3) C(9)–C(10) 1.516(4) C(1)–C(2) 1.370(3) C(10)–C(11) 1.522(3) C(2)–C(3) 1.377(3) C(7)–C(8) 1.527(3) C(15)–C(16) 1.377(3) C(11)–C(12) 1.530(3) C(14)–C(15) 1.379(3) C(7)–C(12) 1.533(3) N(4)–C(12)–C(7) 109.19(14) C(5)–C(4)–C(6) 119.38(17) N(4)–C(12)–C(11) 109.41(16) C(25)–C(26)–C(27) 119.63(16) N(3)–C(7)–C(12) 110.53(14) C(16)–C(15)–C(14) 119.86(19) N(3)–C(7)–C(8) 110.57(16) C(24)#2–C(26)–C(25) 119.94(16) C(8)–C(9)–C(10) 110.97(19) C(21)–C(20)–C(19) 120.19(18) C(11)–C(12)–C(7) 111.19(15) O(2)–C(13)–C(14) 120.24(16) C(8)–C(7)–C(12) 111.22(15) O(1)–C(6)–C(4) 120.39(16) C(9)–C(10)–C(11) 111.41(19) C(24)#2–C(26)–C(27) 120.43(17) C(9)–C(8)–C(7) 111.65(18) C(22)#1–C(20)–C(19) 120.54(18) C(10)–C(11)–C(12) 112.35(19) C(25)–C(24)–C(26)#2 120.78(18) O(8)–C(27)–C(26) 114.85(16) O(5)–C(19)–C(20) 121.16(19) O(4)–C(19)–C(20) 115.16(18) C(21)–C(22)–C(20)#1 121.46(18) N(3)–C(6)–C(4) 115.23(16) O(7)–C(27)–C(26) 121.64(18) N(4)–C(13)–C(14) 115.64(15) N(2)–C(17)–C(16) 121.9(2) C(15)–C(14)–C(18) 117.45(17) O(3)–C(21)–C(20) 122.01(17) C(3)–C(4)–C(5) 118.07(18) O(6)–C(25)–C(26) 122.39(17) C(5)–N(1)–C(1) 118.23(18) N(1)–C(1)–C(2) 122.4(2) C(18)–C(14)–C(13) 118.27(16) N(2)–C(18)–C(14) 122.46(17) O(6)–C(25)–C(24) 118.32(17) C(3)–C(4)–C(6) 122.51(16) O(3)–C(21)–C(22) 118.68(18) N(1)–C(5)–C(4) 122.87(19) C(17)–C(16)–C(15) 119.0(2) O(7)–C(27)–O(8) 123.51(18) C(2)–C(3)–C(4) 119.12(18) O(5)–C(19)–O(4) 123.66(18) C(22)#1–C(20)–C(21) 119.23(16) C(6)–N(3)–C(7) 124.10(15) C(17)–N(2)–C(18) 119.28(17) O(2)–C(13)–N(4) 124.10(17) C(24)–C(25)–C(26) 119.29(16) C(15)–C(14)–C(13) 124.26(16) C(1)–C(2)–C(3) 119.3(2) O(1)–C(6)–N(3) 124.38(18) C(22)–C(21)–C(20) 119.30(18) C(13)–N(4)–C(12) 125.32(16) (III) Preparation method of non-salt-forming solid butyl diester fertilizer synergist Accurately weigh 100 g of eutectic synergist, 200 g of polyethylene glycol, 200 g of soybean enzymatic protein, and 200 g of soybean enzymatic peptide, mix them evenly, and then solidify 300 g of dibutyl diester onto the above sample using a soft spray technique. Then, maintain the temperature at 50°C for 10 min in a boiling dryer and perform air jet milling for 10 min to finally obtain a non-salt-forming solid dibutyl diester fertilizer synergist.

[0021] Example 2 Accurately weigh 100 g of eutectic synergist, 200 g of polyethylene glycol, 150 g of soybean enzymatic protein and 150 g of soybean enzymatic peptide, mix them evenly, and then solidify 400 g of dibutyl diester onto the above sample using a soft spray technique. Then, maintain the temperature at 60℃ for 20 min in a boiling dryer and perform air jet milling for 5 min to finally obtain a non-salt-forming solid dibutyl diester fertilizer synergist.

[0022] Example 3 Accurately weigh 50 g of eutectic synergist, 250 g of polyethylene glycol, 200 g of soybean enzymatic protein, and 150 g of soybean enzymatic peptide, mix them evenly, and then solidify 300 g of dibutyl diester onto the above sample using a soft spray technique. Then, maintain the temperature at 70℃ for 30 min in a boiling dryer and perform air jet milling for 10 min to finally obtain a non-salt-forming solid dibutyl diester fertilizer synergist.

[0023] Example 4 Accurately weigh 50 g of eutectic synergist, 250 g of polyethylene glycol, 150 g of corn hydrolysate and 150 g of corn hydrolysate peptide, mix them evenly, and then solidify 350 g of butyl diester onto the above sample using a soft spray technique. Then, maintain the temperature at 80℃ for 15 min in a boiling dryer and perform air jet milling for 10 min to finally obtain a non-salt-forming solid butyl diester fertilizer synergist.

[0024] Example 5 Accurately weigh 50 g of eutectic synergist, 200 g of polyethylene glycol, 150 g of corn hydrolysate and 200 g of corn hydrolysate peptide, mix them evenly, and then solidify 400 g of dibutyl diester onto the above sample using a soft spray technique. Then, maintain the temperature at 60℃ for 20 min in a boiling dryer and perform air jet milling for 10 min to finally obtain a non-salt-forming solid dibutyl diester fertilizer synergist.

[0025] Example 6 Accurately weigh 100 g of eutectic synergist, 150 g of polyethylene glycol, 250 g of corn hydrolysate and 250 g of corn hydrolysate peptide, mix them evenly, and then solidify 250 g of butyl diester onto the above sample using a soft spray technique. Then, maintain the temperature at 50°C for 20 min in a boiling dryer and perform air jet milling for 10 min to finally obtain a non-salt-forming solid butyl diester fertilizer synergist.

[0026] 1. Garlic seedling growth promotion experiment: Four treatments were set up. Plump garlic bulbs were selected, the outer dry skin was peeled off, and the garlic cloves were separated to ensure that each clove had an intact bulb plate. The treated garlic cloves were arranged neatly in a container with the buds facing upwards, leaving a gap of 1-2 cm between the garlic cloves. Water, non-salt-forming solid butyl diester fertilizer synergist sample prepared in Example 1 at a concentration of 10 mg / L, 10 mg / L butyl diester crude oil, and 10 mg / L eutectic synergist were added to the four treatments respectively. The water level should just touch the bottom of the garlic cloves. The root length and seedling length data were observed after 7 days, as shown in Table 3. Analysis of experimental results: At the same concentration of 10 mg / L, non-salt-forming solid butyl diester significantly promoted the root growth of garlic. The root length increased by 0.82 cm compared with the control, an increase of 22.65%, and the seedling length increased by 3.82 cm compared with the control, an increase of 21.83%. The non-salt-forming solid butyl diester fertilizer synergist prepared in Example 1 was superior to both butyl diester and eutectic synergist. Therefore, the non-salt-forming solid butyl diester fertilizer synergist prepared in this invention has a significant growth-promoting effect on garlic.

[0027] Table 3: Statistical analysis of garlic growth-promoting test results for different samples at the same concentration Product test concentration Example 1 Butyl diester Eutectic Synergist CK Root length (cm) 4.44 4.37 4.28 3.62 Seedling length (cm) 21.32 20.87 20.74 17.50 2. Spinach Field Trial: The experiment included three treatments: Treatment 1: conventional fertilization; Treatment 2: conventional fertilization + non-salt-forming solid butyl diester fertilizer synergist prepared in Example 1; Treatment 3: conventional fertilization + eutectic synergist; Treatment 4: conventional fertilization + butyl diester; Treatment 5: blank control (no fertilization). Application method: Treatments 1, 2, 3, and 4 were treated with 28 kg of compound fertilizer (15-15-15) per acre as basal fertilizer; Treatment 5 was not fertilized. Sowing was done at a rate of 1.5 kg per mu (approximately 0.067 hectares), with a row spacing of 15 cm. Watering was done after sowing, and watering was continued after 20 days. Topdressing was applied at a rate of 18 kg per mu (approximately 0.067 hectares) with (26-0-4). Treatment 2 received 40 g / 5 L of the non-salt-forming solid butyl diester fertilizer synergist prepared in Example 1, while Treatment 3 received 40 g / 5 L of the eutectic synergist, and Treatment 4 received 40 g / 5 L of butyl diester crude oil, while Treatment 5 received 5 L of the substrate, which was applied with water. Pest and disease control was carried out 3 times during the growing season. The entire process took 1.5 months before harvest. The effects of different treatments on the biological traits of spinach were tested at the end of the experiment, as shown in Table 4.

[0028] Table 4: Statistical analysis of fresh weight of single plants under different treatments Results Analysis: Comparison of individual spinach plants under different treatments showed that treatment 2 had the highest average fresh weight per plant, at 23.34 g. Treatment 2 was superior to treatments 3 and 4. The fresh weight per plant in treatment 2 was significantly better than that in treatments 1 and 5. Specifically, the fresh weight per plant in treatment 2 increased by 3.28 g compared to treatment 1, representing a weight gain rate of 16.35%; and the average weight gain per plant in treatment 2 was 4.28 g compared to treatment 5, representing a weight gain rate of 22.45%. Therefore, the non-salt-forming solid butyl diester fertilizer synergist can significantly increase the total fresh weight of spinach plants.

[0029] 3. Maize Seedling Growth Promotion Experiment: After disinfection, maize seeds were placed in petri dishes lined with filter paper. A clean, sterile cotton swab was moistened and placed on the filter paper, and 20 mL of sterile water was added to keep the seeds moist. The petri dishes were then placed in a 28℃ constant temperature incubator to ensure normal seed germination. After germination, maize seeds of similar growth were selected and transplanted into seedling trays. When the first true leaf emerged, samples from Example 1 were applied and diluted with deionized water at different concentrations. The control group (CK) was treated with root irrigation without the addition of the Example 1 sample. Plant height, net weight, and other data were observed after fifteen days. The results are shown in Table 5.

[0030] Table 5. Statistical analysis of maize growth-promoting test results at different concentrations Different concentrations 20 mg / L 30 mg / L 40 mg / L 50 mg / L 60 mg / L CK Average plant height (cm) 45.37 54.07 52.12 47.26 47.55 48.23 Average stem diameter (mm) 3.50 3.93 3.61 3.53 3.39 3.46 Average root length (cm) 18.63 28.97 22.47 22.25 20.29 19.73 Total net weight (g) 29.29 35.5 31.39 29.03 28.80 29.47 Analysis of experimental results: As shown in Table 5, compared with the blank control, the average plant height, average stem diameter and total net weight of maize plants were best when the concentration of non-salt-forming butyl diester was 30 mg / L. The average plant height increased by 12.1%, the average stem diameter increased by 13.5%, the root length increased by 46.83%, and the total net weight increased by 20.46%.

[0031] Therefore, it can be concluded that the non-salt-forming solid butyl diester fertilizer synergist of the present invention, when used as a fertilizer synergist, can significantly promote the root growth and plant growth of garlic and corn, and significantly increase the total fresh weight of spinach plants. It can be widely promoted and used. Taking into account the cost, it can be applied by adding it to water-soluble fertilizer and compound fertilizer through drip irrigation or fertigation at a rate of 40–80 g / mu; or by spraying at a rate of 4–10 g / mu.

Claims

1. A non-salt-forming solid butyl diester fertilizer synergist, characterized in that, By weight, it includes the following raw materials: 50-100 parts of eutectic synergist, 250-400 parts of butyl diester, 150-250 parts of polyethylene glycol, 150-250 parts of plant protein and 150-250 parts of small molecule peptides. The eutectic synergist is [ N , N '-Bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid], with the molecular formula C 26 H 26 N4O8 belongs to the triclinic crystal system. P The -1 space group has the following structure: The succinic acid diethylaminoethanol ester is prepared by esterification of succinic acid and diethylaminoethanol, with the molecular formula C2. 16 H 32 N2O4, structural formula as follows: The plant protein is either soybean hydrolysate or corn hydrolysate, and the small molecule peptide is either soybean hydrolysate or corn hydrolysate.

2. The non-salt-forming solid butyl diester fertilizer synergist according to claim 1, characterized in that, In the eutectic synergist, the bond length of CC ranges from 1.369(3) to 1.533(3) Å, the bond length of CN ranges from 1.326(3) to 1.457(2) Å, the bond length of CO ranges from 1.223(2) to 1.364(2) Å, and the bond angle of CNC ranges from 118.23(18) to 125.32(16). o The bond angle range of CCC is 110.97(19)-122.51(16). o .

3. The preparation method of the non-salt-forming solid butadiene diester fertilizer synergist according to claim 1, characterized in that, The eutectic synergist, polyethylene glycol, plant protein, and small molecule peptide are weighed according to the weight parts, thoroughly mixed, and then the butadiene diester is solidified into the above mixture by a soft spraying technology. Finally, a non-salt-forming solid butadiene diester fertilizer synergist is obtained by a fluidized bed drying and air jet milling process.

4. The preparation method of the non-salt-forming solid butyl diester fertilizer synergist according to claim 3, characterized in that, The preparation method of the eutectic synergist includes the following steps: 1) with N , N Using '-bis(3-pyridinecarboxamide)-1,2-cyclohexane and 2,5-dihydroxyterephthalic acid as raw materials, in a certain molar ratio, with water as solvent, the pH was adjusted to 8, and the mixture was heated to reflux at a certain temperature for a period of time. 2) Filter and dry for a certain period of time to obtain [ N , N '-Bis(3-pyridinecarboxamide)-1,2-cyclohexane]·[2,5-dihydroxyterephthalic acid], i.e., eutectic synergist.

5. The preparation method of the non-salt-forming solid butyl diester fertilizer synergist according to claim 4, characterized in that, In step 1), N , N The molar ratio of '-bis(3-pyridinecarboxamide)-1,2-cyclohexane and 2,5-dihydroxyterephthalic acid is 1:1–3; the pH is adjusted to 8 using sodium hydroxide, the reaction temperature is 90–100℃, and the reaction time is 1–2 h; in step 2), the filtration time is 0.5–1 h; the drying temperature is 85–90℃, and the drying time is 1–2 h.

6. The preparation method of the non-salt-forming solid butyl diester fertilizer synergist according to claim 3, characterized in that, The boiling drying temperature is 50–80℃ and the time is 10–30 min; the air jet milling time is 5–10 min.

7. The application method of the non-salt-forming solid butyl diester fertilizer synergist according to claim 1, characterized in that, The non-salt-forming solid butyl diester fertilizer synergist is applied by drip irrigation or fertigation at a rate of 40–80 g / mu; or by foliar spraying at a rate of 4–10 g / mu.

8. The application of the non-salt-forming solid butyl diester fertilizer synergist according to claim 1, characterized in that, The non-salt-forming solid butyl diester fertilizer synergist is added to water-soluble fertilizer or compound fertilizer and used throughout the entire crop growth cycle; the plant is garlic, corn or spinach.

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