Foliar fertilizer special for traditional Chinese medicine and preparation method of foliar fertilizer

Abstract

The invention discloses a special foliar fertilizer for traditional Chinese medicines and a preparation method thereof, and belongs to the technical field of agricultural fertilizers. The preparation method comprises the following steps: adding citric acid into deionized water, uniformly mixing, then adding urea and monopotassium phosphate into a reaction system under continuous stirring at 200-300rpm, stirring until the urea and the monopotassium phosphate are completely dissolved, then sequentially adding modified silica sol, fulvic acid chelated iron and fulvic acid chelated zinc, continuously stirring for 10-15 minutes after each component is added, finally adding tween-80, and keeping stirring for 15-20 minutes, so as to obtain a finished product. The traditional Chinese medicine special leaf fertilizer is obtained. The foliar fertilizer can improve the biomass of traditional Chinese medicinal materials and the yield of medicinal parts, and has an excellent yield increasing effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of agricultural fertilizers, and more particularly relates to a special leaf fertilizer for traditional Chinese medicine and a preparation method thereof. BACKGROUND

[0002] Leaf fertilizers can directly absorb nutrients through leaves, supplement nutrients for crops in the critical period of growth, and improve the yield and quality of crops. However, compared with ordinary crops, traditional Chinese medicine has more stringent requirements for quality. The ordinary leaf fertilizer may not meet the special needs of traditional Chinese medicine for various elements at different growth stages in terms of nutrient allocation, resulting in the problem of unbalanced nutrition during the growth of traditional Chinese medicinal materials, affecting the growth and development and synthesis of effective components of the traditional Chinese medicinal materials. Therefore, how to avoid this phenomenon is the key to solving the problem. For example, a leaf fertilizer composition, a preparation method and application thereof are disclosed in Chinese Patent Application No. CN118459264A. The leaf fertilizer composition has a simple preparation process, improves the film-forming property and adhesion of the fertilizer, is beneficial to reducing the amount of fertilization, and improves the drought resistance of plants. However, the yield-increasing effect on traditional Chinese medicinal materials needs to be improved. SUMMARY

[0003] TECHNICAL PROBLEM In view of the deficiencies in the prior art, the present application provides a special leaf fertilizer for traditional Chinese medicine and a preparation method thereof. The leaf fertilizer can improve the biomass and yield of medicinal parts of traditional Chinese medicinal materials, and has excellent yield-increasing effect.

[0004] TECHNICAL SCHEME To solve the above problems, the technical scheme adopted by the present application is as follows: The preparation method of the special leaf fertilizer for traditional Chinese medicine comprises the following steps: (1) Preparation of modified silica sol; (2) Preparation of fulvic acid chelated iron; (3) Preparation of fulvic acid chelated zinc; (4) Citric acid is added to deionized water and mixed uniformly, then urea, potassium dihydrogen phosphate are added to the reaction system under continuous stirring at 200-300 rpm, and stirring is continued until complete dissolution, then modified silica sol, fulvic acid chelated iron and fulvic acid chelated zinc are sequentially added, stirring is continued for 10-15 min after the addition of each component, finally Tween-80 is added, and stirring is continued for 15-20 min, to obtain the special leaf fertilizer for traditional Chinese medicine.

[0005] Further, in step (1), the preparation method of the modified silica sol is as follows: S1: adding anhydrous ethanol, deionized water into a reactor, mixing uniformly to prepare a solution, then adding silica sol, ultrasonic treatment for 10-15 min, then adding (3-aminopropyl) triethoxysilane, stirring and reacting at 55-65 °C for 2-4 h, after the reaction is completed, centrifuging, washing to obtain intermediate 1; S2: adding intermediate 1 into deionized water, ultrasonic treatment for 15-20 min, then adding glycine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide, N-hydroxysuccinimide, mixing uniformly, stirring and reacting at 30-40 °C for 8-12 h, after the reaction is completed, using a 800-1000 Da dialysis bag to dialyze for 48-72 h, purifying to obtain modified silica sol.

[0006] Further, the amount ratio of anhydrous ethanol, deionized water, silica sol, (3-aminopropyl) triethoxysilane in S1 is 4-5 mL:14-16 mL:2-2.1 g:0.8-1 g.

[0007] Further, the amount ratio of deionized water, intermediate 1, glycine, 1-ethyl-(3-dimethylaminopropyl) carbodiimide, N-hydroxysuccinimide in S2 is 25-30 mL:1.4-1.5 g:0.18-0.24 g:0.06-0.1 g:0.04-0.06 g.

[0008] Further, in step (2), the preparation method of the yellow ferric citrate is as follows: adding biochemical yellow ferric citrate into deionized water, ultrasonic treatment for 50-70 min, then adding ferrous sulfate, ascorbic acid, mixing uniformly, adjusting pH to 5 with ammonia water, stirring and reacting at 45-55 °C for 85-95 min, after the reaction is completed, centrifuging the reaction solution at 3500 r / min for 8-12 min, taking the supernatant, pouring into 4 times amount of anhydrous ethanol to precipitate for 2-3 h, suction filtering, washing and drying to obtain yellow ferric citrate.

[0009] Further, the amount ratio of deionized water, biochemical yellow ferric citrate, ferrous sulfate, ascorbic acid is 45-50 mL:4.8-5 g:7.4-7.6 g:0.7-0.8 g.

[0010] Further, in step (3), the preparation method of the yellow zinc ferric citrate is as follows: adding biochemical yellow ferric citrate into deionized water, ultrasonic treatment for 50-70 min, then adding zinc sulfate, mixing uniformly, adjusting pH to 6 with ammonia water, stirring and reacting at 35-45 °C for 110-130 min, after the reaction is completed, pouring the reaction solution into 4 times amount of anhydrous ethanol to precipitate for 2-3 h, suction filtering, washing and drying to obtain yellow zinc ferric citrate.

[0011] Furthermore, the ratio of deionized water, biochemical humic acid, and zinc sulfate is 45-50 mL: 4.8-5 g: 9.8-10 g.

[0012] Further, in step (4), the weight parts of each component are: 0.5-1 parts of citric acid, 60-70 parts of deionized water, 18-20 parts of urea, 8-12 parts of potassium dihydrogen phosphate, 3-5 parts of modified silica sol, 1-1.5 parts of humic acid chelated iron, 0.5-1 parts of humic acid chelated zinc, and 0.2-0.3 parts of Tween-80.

[0013] This invention also protects a foliar fertilizer specifically for traditional Chinese medicine, which is prepared using any of the preparation methods described above.

[0014] Beneficial technical effects Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Silica sol has a nano-scale porous structure, which can effectively load other nutrient molecules, play a slow-release role, and prolong the fertilizer effect. By modifying it with glycine, its affinity with leaves is improved, which can make the foliar fertilizer less likely to slip off the leaf surface and improve the utilization rate. Iron is a key catalyst in chlorophyll synthesis, and zinc is an activator of a variety of enzymes and can participate in the synthesis of auxin. By using biochemical fulvic acid as a chelating agent matrix, iron and zinc are wrapped up to form a form that is more easily absorbed by Chinese medicinal materials. Through their synergistic effect, while meeting the basic needs of growth and metabolism of Chinese medicinal materials, it effectively promotes the accumulation of photosynthetic products and the directional transport to the medicinal parts, which can increase the yield and improve the biomass and yield of medicinal parts.

[0015] (2) A foliar fertilizer for Chinese medicine of the present invention is obtained by the preparation method of the present invention and has all the beneficial effects of the preparation method of the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with specific embodiments.

[0018] The reagents used in the following specific embodiments are of analytical grade. Additionally: Silica sol: density 1.29 g·cm³ -3The average particle size is 60 nm, the pH is approximately 8, the solid phase mass fraction is 40%, and the specific surface area is 200 m². 2 ·g -1 The manufacturer is Shanghai McLean Biochemical Technology Co., Ltd.

[0019] Example 1 This embodiment provides a foliar fertilizer specifically for traditional Chinese medicine, the preparation method of which includes the following steps: (1) Add 4 mL of anhydrous ethanol and 14 mL of deionized water to the reactor, mix well to prepare a solution, then add 2 g of silica sol, sonicate for 10 min, then add 0.8 g of (3-aminopropyl)triethoxysilane, stir at 55 °C for 2 h, after the reaction is completed, centrifuge, wash to obtain intermediate 1. (2) Add 1.4 g of intermediate 1 to 25 mL of deionized water, sonicate for 15 min, then add 0.18 g of glycine, 0.06 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 0.04 g of N-hydroxysuccinimide, mix well, stir and react at 30 °C for 8 h. After the reaction is completed, dialyze using an 800 Da dialysis bag for 48 h to purify and obtain modified silica sol; (3) Add 4.8g of biochemical fulvic acid to 45mL of deionized water, sonicate for 50min, then add 7.4g of ferrous sulfate and 0.7g of ascorbic acid, mix well, adjust the pH to 5 with ammonia, stir at 45℃ for 85min, after the reaction is completed, centrifuge the reaction solution at 3500r / min for 8min, take the supernatant, pour it into 4 times the amount of anhydrous ethanol for 2h precipitation, filter, wash and dry to obtain fulvic acid chelated iron.

[0020] (4) Add 4.8g of biochemical fulvic acid to 45mL of deionized water, sonicate for 50min, then add 9.8g of zinc sulfate, mix well, adjust the pH to 6 with ammonia, stir at 35℃ for 110min, after the reaction is completed, pour the reaction solution into 4 times the amount of anhydrous ethanol to precipitate for 2h, filter, wash and dry to obtain fulvic acid chelated zinc.

[0021] (5) Add 0.5 parts by weight of citric acid to 60 parts by weight of deionized water and mix evenly. Then, while stirring continuously at 200 rpm, add 18 parts by weight of urea and 8 parts by weight of potassium dihydrogen phosphate to the reaction system and stir until completely dissolved. Then, add 3 parts by weight of modified silica sol, 1 part by weight of fulvic acid chelated iron, and 0.5 parts by weight of fulvic acid chelated zinc in sequence. Stir continuously for 10 min after each addition of a component. Finally, add 0.2 parts by weight of Tween-80 and keep stirring for 15 min to obtain a special foliar fertilizer for Chinese medicine.

[0022] Example 2 This embodiment provides a foliar fertilizer specifically for traditional Chinese medicine, the preparation method of which includes the following steps: (1) Add 5 mL of anhydrous ethanol and 16 mL of deionized water to the reactor, mix well to prepare a solution, then add 2.1 g of silica sol, sonicate for 15 min, then add 1 g of (3-aminopropyl)triethoxysilane, stir at 65 °C for 4 h, after the reaction is completed, centrifuge, wash to obtain intermediate 1. (2) Add 1.5g of intermediate 1 to 30mL of deionized water, sonicate for 20min, then add 0.24g of glycine, 0.1g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 0.06g of N-hydroxysuccinimide, mix well, stir and react at 40℃ for 12h. After the reaction is completed, dialyze with a 1000Da dialysis bag for 72h to purify and obtain modified silica sol; (3) Add 5g of biochemical fulvic acid to 50mL of deionized water, sonicate for 70min, then add 7.6g of ferrous sulfate and 0.8g of ascorbic acid, mix well, adjust the pH to 5 with ammonia, stir at 55℃ for 95min, after the reaction is completed, centrifuge the reaction solution at 3500r / min for 12min, take the supernatant, pour it into 4 times the amount of anhydrous ethanol for precipitation for 3h, filter, wash and dry to obtain fulvic acid chelated iron.

[0023] (4) Add 5g of biochemical fulvic acid to 50mL of deionized water, sonicate for 70min, then add 10g of zinc sulfate, mix well, adjust the pH to 6 with ammonia, stir at 45℃ for 130min, after the reaction is completed, pour the reaction solution into 4 times the amount of anhydrous ethanol to precipitate for 3h, filter, wash and dry to obtain fulvic acid chelated zinc.

[0024] (5) Add 1 part by weight of citric acid to 70 parts by weight of deionized water and mix evenly. Then, while stirring continuously at 300 rpm, add 20 parts by weight of urea and 12 parts by weight of potassium dihydrogen phosphate to the reaction system and stir until completely dissolved. Then, add 5 parts by weight of modified silica sol, 1.5 parts by weight of fulvic acid chelated iron and 1 part by weight of fulvic acid chelated zinc in sequence. Stir continuously for 15 min after each addition of a component. Finally, add 0.3 parts by weight of Tween-80 and keep stirring for 20 min to obtain a special foliar fertilizer for Chinese medicine.

[0025] Example 3 This embodiment provides a foliar fertilizer specifically for traditional Chinese medicine, the preparation method of which includes the following steps: (1) Add 4.5 mL of anhydrous ethanol and 15 mL of deionized water to the reactor, mix well to prepare a solution, then add 2.05 g of silica sol, sonicate for 12 min, then add 0.9 g of (3-aminopropyl)triethoxysilane, stir at 60 °C for 3 h, after the reaction is completed, centrifuge, wash to obtain intermediate 1; (2) Add 1.45 g of intermediate 1 to 28 mL of deionized water, sonicate for 18 min, then add 0.21 g of glycine, 0.08 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 0.05 g of N-hydroxysuccinimide, mix well, stir and react at 35 °C for 10 h. After the reaction is completed, dialyze with a 900 Da dialysis bag for 60 h to purify and obtain modified silica sol; (3) Add 4.9g of biochemical fulvic acid to 48mL of deionized water, sonicate for 60min, then add 7.5g of ferrous sulfate and 0.75g of ascorbic acid, mix well, adjust the pH to 5 with ammonia, stir at 50℃ for 90min, after the reaction is completed, centrifuge the reaction solution at 3500r / min for 10min, take the supernatant, pour it into 4 times the amount of anhydrous ethanol for precipitation for 2.5h, filter, wash and dry to obtain fulvic acid chelated iron.

[0026] (4) Add 4.9g of biochemical fulvic acid to 48mL of deionized water, sonicate for 60min, then add 9.9g of zinc sulfate, mix well, adjust the pH to 6 with ammonia, stir at 40℃ for 120min, after the reaction is completed, pour the reaction solution into 4 times the amount of anhydrous ethanol to precipitate for 2.5h, filter, wash and dry to obtain fulvic acid chelated zinc.

[0027] (5) Add 0.8 parts by weight of citric acid to 65 parts by weight of deionized water and mix evenly. Then, while stirring continuously at 250 rpm, add 19 parts by weight of urea and 10 parts by weight of potassium dihydrogen phosphate to the reaction system and stir until completely dissolved. Then, add 4 parts by weight of modified silica sol, 1.2 parts by weight of fulvic acid chelated iron and 0.8 parts by weight of fulvic acid chelated zinc in sequence. Stir continuously for 12 min after each addition of a component. Finally, add 0.2 parts by weight of Tween-80 and keep stirring for 18 min to obtain a special foliar fertilizer for Chinese medicine.

[0028] Example 4 This embodiment provides a foliar fertilizer specifically for traditional Chinese medicine, the preparation method of which includes the following steps: (1) Add 4.2 mL of anhydrous ethanol and 14.5 mL of deionized water to the reactor, mix well to prepare a solution, then add 2.02 g of silica sol, sonicate for 11 min, then add 0.85 g of (3-aminopropyl)triethoxysilane, stir at 58 °C for 2 h, after the reaction is completed, centrifuge, wash to obtain intermediate 1; (2) Add 1.42 g of intermediate 1 to 26 mL of deionized water, sonicate for 16 min, then add 0.2 g of glycine, 0.07 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 0.04 g of N-hydroxysuccinimide, mix well, stir and react at 32 °C for 9 h. After the reaction is completed, dialyze with an 800 Da dialysis bag for 54 h to purify and obtain modified silica sol; (3) Add 4.85g of biochemical fulvic acid to 46mL of deionized water, sonicate for 55min, then add 7.45g of ferrous sulfate and 0.72g of ascorbic acid, mix well, adjust the pH to 5 with ammonia, stir at 48℃ for 88min, after the reaction is completed, centrifuge the reaction solution at 3500r / min for 9min, take the supernatant, pour it into 4 times the amount of anhydrous ethanol for 2h precipitation, filter, wash and dry to obtain fulvic acid chelated iron.

[0029] (4) Add 4.85g of biochemical fulvic acid to 46mL of deionized water, sonicate for 55min, then add 9.85g of zinc sulfate, mix well, adjust the pH to 6 with ammonia, stir at 38℃ for 115min, after the reaction is complete, pour the reaction solution into 4 times the amount of anhydrous ethanol to precipitate for 2h, filter, wash and dry to obtain fulvic acid chelated zinc.

[0030] (5) Add 0.6 parts by weight of citric acid to 62 parts by weight of deionized water and mix evenly. Then, while stirring continuously at 200 rpm, add 18 parts by weight of urea and 9 parts by weight of potassium dihydrogen phosphate to the reaction system and stir until completely dissolved. Then, add 3 parts by weight of modified silica sol, 1 part by weight of fulvic acid chelated iron, and 0.6 parts by weight of fulvic acid chelated zinc in sequence. Stir continuously for 11 min after each addition of a component. Finally, add 0.2 parts by weight of Tween-80 and keep stirring for 16 min to obtain a special foliar fertilizer for Chinese medicine.

[0031] Example 5 This embodiment provides a foliar fertilizer specifically for traditional Chinese medicine, the preparation method of which includes the following steps: (1) Add 4.8 mL of anhydrous ethanol and 15.5 mL of deionized water to the reactor, mix well to prepare a solution, then add 2.08 g of silica sol, sonicate for 14 min, then add 0.95 g of (3-aminopropyl)triethoxysilane, stir at 62 °C for 4 h, after the reaction is completed, centrifuge, wash to obtain intermediate 1; (2) Add 1.48 g of intermediate 1 to 29 mL of deionized water, sonicate for 19 min, then add 0.22 g of glycine, 0.09 g of 1-ethyl-(3-dimethylaminopropyl)carbodiimide and 0.06 g of N-hydroxysuccinimide, mix well, stir and react at 38 °C for 11 h. After the reaction is completed, dialyze with a 1000 Da dialysis bag for 66 h to purify and obtain modified silica sol; (3) Add 4.95g of biochemical fulvic acid to 49mL of deionized water, sonicate for 65min, then add 7.55g of ferrous sulfate and 0.78g of ascorbic acid, mix well, adjust the pH to 5 with ammonia, stir at 52℃ for 92min, after the reaction is completed, centrifuge the reaction solution at 3500r / min for 11min, take the supernatant, pour it into 4 times the amount of anhydrous ethanol for 3h to precipitate, filter, wash and dry to obtain fulvic acid chelated iron.

[0032] (4) Add 4.95g of biochemical fulvic acid to 49mL of deionized water, sonicate for 65min, then add 9.95g of zinc sulfate, mix well, adjust the pH to 6 with ammonia, stir at 42℃ for 125min, after the reaction is completed, pour the reaction solution into 4 times the amount of anhydrous ethanol to precipitate for 3h, filter, wash and dry to obtain fulvic acid chelated zinc.

[0033] (5) Add 0.9 parts by weight of citric acid to 68 parts by weight of deionized water and mix evenly. Then, while stirring continuously at 300 rpm, add 20 parts by weight of urea and 11 parts by weight of potassium dihydrogen phosphate to the reaction system and stir until completely dissolved. Then, add 5 parts by weight of modified silica sol, 1.5 parts by weight of fulvic acid chelated iron and 1 part by weight of fulvic acid chelated zinc in sequence. Stir continuously for 14 min after each addition of a component. Finally, add 0.3 parts by weight of Tween-80 and keep stirring for 19 min to obtain a special foliar fertilizer for Chinese medicine.

[0034] Comparative Example 1 The main difference between this comparative example and Example 5 is that intermediate 1 is used instead of the modified silica sol.

[0035] Comparative Example 2 The main difference between this comparative example and Example 5 is that fulvic acid chelated iron was not added.

[0036] Comparative Example 3 The main difference between this comparative example and Example 5 is that fulvic acid chelated zinc was not added.

[0037] Performance testing The performance of the foliar fertilizers for traditional Chinese medicine prepared in Examples 1-5 and Comparative Examples 1-3 was tested.

[0038] Foliar fertilizer application method: Apply the first foliar spray to Polygonatum sibiricum, Bletilla striata, Asparagus cochinchinensis and Cremastra appendiculata 30 days after transplanting. Spray once every 30 days thereafter, for a total of 3 sprays, with a spraying amount of 20L / mu.

[0039] Biomass determination of Chinese medicinal materials: Plants from each group were randomly collected and washed with ultrapure water. The total fresh weight (FW) of the plants was measured first, and then the fresh weight of the medicinal parts of Polygonatum sibiricum, Bletilla striata, Asparagus cochinchinensis, and Cremastra appendiculata (hereinafter collectively referred to as medicinal parts) was measured. All plant parts were dried at 75℃ to obtain their total dry weight (DW), and the dry weight of the tubers was measured. The biomass of each group of Chinese medicinal materials is shown in Table 1.

[0040] Table 1: Performance Tests

[0041] As can be seen from Table 1, the foliar fertilizers for Chinese medicinal herbs prepared in Examples 1-5 can increase the biomass and yield of medicinal parts of the four Chinese medicinal herbs, and have excellent yield-increasing effects.

[0042] The comparison shows that Comparative Example 1, lacking glycine to modify the silica sol, had poorer adhesion to the leaves, making it more prone to condensation and dripping, resulting in reduced nutrient absorption efficiency. Therefore, the biomass and yield of medicinal parts of the Chinese medicinal materials decreased compared to the Example. Comparative Example 2 did not add fulvic acid to chelate iron. Iron deficiency caused chlorosis and yellowing of new leaves, a sharp decline in photosynthetic efficiency, and the inability of chloroplasts to form and function normally. Therefore, the biomass and yield of medicinal parts of the Chinese medicinal materials decreased most significantly. Comparative Example 3 did not add fulvic acid to chelate zinc. Zinc deficiency led to insufficient synthesis of auxin in the medicinal materials, resulting in disordered growth and metabolism, which indirectly affected photosynthetic efficiency. Therefore, the biomass and yield of medicinal parts of the Chinese medicinal materials were better than Comparative Example 2, but worse than the Example and Comparative Example 1.

[0043] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0045] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments. It should be noted that many modifications and improvements can be made by those skilled in the art, and all modifications or improvements not exceeding the scope of the claims should be considered within the protection scope of the present invention.

Claims

1. A preparation method of a special foliar fertilizer for traditional Chinese medicine, characterized in that, It comprises the following steps: (1) preparation of modified silica sol; (2) preparation of fulvic acid chelated iron; (3) preparation of fulvic acid chelated zinc; (4) add citric acid to deionized water, mix well, then add urea, potassium dihydrogen phosphate to the reaction system under continuous stirring at 200-300 rpm, stir until completely dissolved, then add modified silica sol, fulvic acid chelated iron, fulvic acid chelated zinc in turn, continue stirring for 10-15 min after adding each component, finally add Tween-80, keep stirring for 15-20 min, get the special foliar fertilizer for traditional Chinese medicine.

2. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 1, characterized in that, In the step (1), the preparation method of modified silica sol is: S1: add anhydrous ethanol, deionized water to the reactor, mix well to prepare a solution, then add silica sol, ultrasonic treatment for 10-15 min, then add (3-aminopropyl) triethoxysilane, stir at 55-65℃ for 2-4h, after the reaction is completed, centrifuge, wash, get intermediate 1; S2: add intermediate 1 to deionized water, ultrasonic treatment for 15-20 min, then add glycine, 1-ethyl-(3-dimethylaminopropyl) carbonyldiimidazole, N-hydroxysuccinimide, mix well, stir at 30-40℃ for 8-12h, after the reaction is completed, use 800-1000 Da dialysis bag to dialyze for 48-72h, purify, get modified silica sol.

3. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 2, characterized in that, The amount ratio of anhydrous ethanol, deionized water, silica sol, (3-aminopropyl) triethoxysilane in S1 is 4-5mL:14-16mL:2-2.1g:0.8-1g.

4. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 2, characterized in that, The amount ratio of deionized water, intermediate 1, glycine, 1-ethyl-(3-dimethylaminopropyl) carbonyldiimidazole, N-hydroxysuccinimide in S2 is 25-30mL:1.4-1.5g:0.18-0.24g:0.06-0.1g:0.04-0.06g.

5. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 1, characterized in that, In the step (2), the preparation method of fulvic acid chelated iron is: add biochemical fulvic acid to deionized water, ultrasonic treatment for 50-70 min, then add ferrous sulfate, ascorbic acid, mix well, adjust pH to 5 with ammonia water, stir at 45-55℃ for 85-95 min, after the reaction is completed, centrifuge the reaction liquid at 3500r / min for 8-12 min, take the supernatant, pour into 4 times the amount of anhydrous ethanol to precipitate for 2-3h, suction filtration, wash and dry, get fulvic acid chelated iron.

6. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 5, characterized in that, The amount ratio of deionized water, biochemical fulvic acid, ferrous sulfate, ascorbic acid is 45-50mL:4.8-5g:7.4-7.6g:0.7-0.8g.

7. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 1, characterized in that, In the step (3), the preparation method of fulvic acid chelated zinc is: add biochemical fulvic acid to deionized water, ultrasonic treatment for 50-70 min, then add zinc sulfate, mix well, adjust pH to 6 with ammonia water, stir at 35-45℃ for 110-130 min, after the reaction is completed, pour the reaction liquid into 4 times the amount of anhydrous ethanol to precipitate for 2-3h, suction filtration, wash and dry, get fulvic acid chelated zinc.

8. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 7, characterized in that, The deionized water, biochemical fulvic acid and zinc sulfate are used in a ratio of 45-50 mL:4.8-5 g:9.8-10 g.

9. The preparation method of the special leaf fertilizer for traditional Chinese medicine according to claim 1, characterized in that, In the step (4), the weight parts of the components are as follows: citric acid 0.5-1 part, deionized water 60-70 parts, urea 18-20 parts, potassium dihydrogen phosphate 8-12 parts, modified silica sol 3-5 parts, iron chelate of fulvic acid 1-1.5 parts, zinc chelate of fulvic acid 0.5-1 part, and Tween-80 0.2-0.3 part.

10. A special-purpose foliar fertilizer for traditional Chinese medicine, characterized in that, Prepared by the preparation method of any one of claims 1-9.

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