Preparation method of nano silicon-based pesticide-fertilizer delivery substance
Patent Information
- Application Number
- CN202511125172.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-12-02
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of inorganic fertilizer technology, specifically relating to a method for preparing a nano-silicon-based fertilizer delivery substance. Background Technology
[0002] Foliar fertilizers are a type of product that is applied through foliar spraying and has the dual functions of nutrient supplementation and pest and disease control. The main components include insecticides, fungicides and nutrients required for plant growth. They have the advantages of rapid absorption, low dosage, significant effect, convenient use and good pest and disease control.
[0003] However, foliar fertilizers also have many limitations, such as: they are easily washed away by rainwater, and if it rains after spraying, it will affect the fertilizer efficiency and insecticidal and fungicidal effects; they are very likely to cause fertilizer damage (leaf burn), so there are strict requirements for the spraying concentration; the nutrients provided by a single spray are limited, and the effect lasts for a short time; the amount of nutrients absorbed by the leaves at one time is limited, especially for leaves with thick cuticles, the absorption effect of foliar fertilizers is even worse; there is a waxy layer on the surface of plant leaves, which forms a hydrophobic barrier, hindering the adhesion of foliar fertilizers, resulting in a decrease in fertilizer efficiency and insecticidal and fungicidal effects.
[0004] In existing technologies, foliar fertilizers loaded with nano-silica can improve the adhesion rate of foliar fertilizers to plant leaves. For example, patent CN114051894A discloses a passion fruit planting method. This patent provides a foliar fertilizer whose components are soybean protein, corn protein, soybean protease, corn protease, sugar residue, yeast extract, manganese chloride, nano-silica, and urea. The role of nano-silica is to adsorb the nutrients of the compound foliar fertilizer onto the passion fruit leaves, thereby increasing the retention time of the compound foliar fertilizer on the leaves and improving fertilizer utilization. However, 1. Due to the high surface energy of nano-silica, it is prone to agglomeration. This method only uses ultrasonic dispersion (physical dispersion), which has a poor dispersion effect, resulting in uneven spraying, reduced leaf coverage, and decreased fertilizer utilization; 2. Nano-silica only physically adsorbs the nutrients of the compound foliar fertilizer and has no slow-release effect. At high temperatures, nutrients such as urea will be released explosively, causing losses. Summary of the Invention
[0005] To address the problems existing in the prior art, this invention provides a method for preparing a nano-silicon-based fertilizer delivery substance, achieving the following objectives: significant effect after spraying, strong resistance to rain and strong winds, and good slow-release effect.
[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A method for preparing a nano-silicon-based drug-fertilizer delivery substance includes: preparing hollow nano-silica, carboxylation, loading, and surface modification; 1. Preparation of hollow nano-silica Resorcinol and formaldehyde were added to an ethanol solution and stirred until completely dissolved. Ammonia was then added and stirring was continued for 5–7 hours. Tetraethyl orthosilicate was then added and reacted for 22–26 hours. The mixture was centrifuged, and the precipitate was washed 2–4 times with ethanol and deionized water, respectively. It was then vacuum dried at 55–65°C to constant weight and transferred to a muffle furnace. The precipitate was calcined at 550–650°C for 3–5 hours to obtain hollow nano-silica. The mass ratio of resorcinol, formaldehyde, ethanol solution, ammonia, and tetraethyl orthosilicate is 0.8–1.2:0.001–0.003:160–170:7–8:5.5–6.5. The ethanol solution has a mass fraction of 80-90%. The mass fraction of the ammonia water is 55-65%.
[0007] 2. Carboxylation Silane coupling agent KH550 and succinic anhydride were added to N,N-dimethylformamide and stirred until homogeneous. Hollow nano-silica was then added and ultrasonically dispersed for 0.8–1.2 h. The mixture was then stirred at 35–45 °C for 2.5–3.5 h. After the reaction was completed, the mixture was repeatedly washed with anhydrous ethanol and deionized water until neutral. The mixture was then dried at 55–65 °C to constant weight to obtain carboxylated hollow nano-silica. The mass ratio of KH550, succinic anhydride, N,N-dimethylformamide, and hollow nano-silica is 10-12:4.5-5.5:65-75:15-17.
[0008] 3. Load Carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, and ferric citrate were added to deionized water, stirred thoroughly, ultrasonically dispersed for 30–50 min, and vacuum dried at 50–70 °C to constant weight to obtain powder A. The mass ratio of the carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, ferric citrate, and deionized water is 7–9:0.08–0.12:0.04–0.06:1.1–1.3:28–32.
[0009] 4. Surface finishing Using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed again 1 to 3 times to obtain nano-silicon-based drug-fertilizer delivery material. The ascorbic acid solution has a mass fraction of 0.8%–1.2%. The mass fraction of the dopamine solution is 0.1% to 0.3%.
[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Hollow nano-silica is produced by forming phenolic oligomers from formaldehyde and resorcinol, then adding tetraethyl orthosilicate, and copolymerizing the SiO2 precursor generated by hydrolysis with the phenolic oligomers. This process coats the phenolic oligomers with a layer of SiO2, followed by high-temperature calcination to remove the phenolic oligomers. Hollow nano-silica has a high loading rate for drugs and nutrients and good adsorption properties. Its rough surface allows it to easily adhere to microstructures such as hairs on crop leaves, resulting in a high adhesion rate to plant leaves.
[0011] 2. By carboxylating hollow nano-silica and then loading it with methyl jasmonate, pyraclostrobin, and ferric citrate, the functions of methyl jasmonate are as follows: S1. It actively activates plant defense signals, inducing plant leaves to actively produce transport oxalic acid and calcium ions, thereby forming calcium oxalate crystals on the leaf surface, thus improving the defense against pests and diseases; S2. During the formation of calcium oxalate crystals, calcium ions can simultaneously bind with the carboxyl groups in the carboxylated hollow nano-silica, thus tightly fixing the prepared nano-silica-based pesticide and fertilizer delivery substance, which has high resistance to rain and strong winds; pyraclostrobin is a broad-spectrum fungicide, further reducing the probability of pests and diseases; ferric citrate can continuously provide iron to plant leaves.
[0012] 3. During the surface modification process, ascorbic acid is first uniformly sprayed onto the surface of powder A. S1. Ascorbic acid can convert the iron ions released from ferric citrate into ferrous ions needed by plant leaves. S2. After being absorbed by plant leaves, ascorbic acid can be metabolized into oxalic acid, which is then transported to the plant leaves to form calcium oxalate crystals. Then, a layer of dopamine solution is sprayed. Through dopamine self-polymerization, a protective layer is formed, which can effectively slow down the release efficiency of nutrients and drugs by the prepared nano-silicon-based fertilizer delivery material and improve the effective action time.
[0013] 4. The nano-silicon-based fertilizer delivery substance of this invention exhibits significant effects after spraying, with chlorophyll content reaching 1.58–1.63 mg / g and net photosynthetic rate reaching 18.96–19.23 mol / (m²). 2 The probability of pests and diseases is as low as 4.3-5.1%, and the fruit yield per mu reaches 2598-2634 kg; it has high resistance to rain and strong winds, with a residual rate of 92.8-93.3% after strong winds and 90.1-90.7% after rainfall; it has a good slow-release effect, with chlorophyll content of 1.37-1.41 mg / g after 20 days. Detailed Implementation
[0015] Example 1 1. Preparation of hollow nano-silica Resorcinol and formaldehyde were added to an ethanol solution and stirred until completely dissolved. Ammonia was then added and stirring was continued for 6 hours. Tetraethyl orthosilicate was added and reacted for 24 hours. The mixture was then centrifuged, and the precipitate was washed three times with ethanol and deionized water, respectively. After drying under vacuum at 60°C to constant weight, the precipitate was transferred to a muffle furnace and calcined at 600°C for 4 hours to obtain hollow nano-silica. The mass ratio of resorcinol, formaldehyde, ethanol solution, ammonia, and tetraethyl orthosilicate is 1:0.002:165:7.5:6. The ethanol solution has a mass fraction of 85%. The ammonia solution has a mass fraction of 60%.
[0016] 2. Carboxylation Silane coupling agent KH550 and succinic anhydride were added to N,N-dimethylformamide and stirred evenly. Hollow nano-silica was then added and ultrasonically dispersed for 1 hour. The mixture was then stirred at 40°C for 3 hours. After the reaction was completed, the mixture was repeatedly washed with anhydrous ethanol and deionized water until neutral. The mixture was then dried at 60°C to constant weight to obtain carboxylated hollow nano-silica. The mass ratio of KH550, succinic anhydride, N,N-dimethylformamide, and hollow nano-silica is 11:5:70:16.
[0017] 3. Load Carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, and ferric citrate were added to deionized water, stirred thoroughly, ultrasonically dispersed for 40 minutes, and vacuum dried at 60°C to constant weight to obtain powder A. The mass ratio of the carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, ferric citrate, and deionized water is 8:0.1:0.05:1.2:30.
[0018] 4. Surface finishing Using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed twice more to obtain nano-silicon-based drug-fertilizer delivery material. The ascorbic acid solution has a mass fraction of 1%; The dopamine solution has a mass fraction of 0.2%.
[0019] Example 2 1. Preparation of hollow nano-silica Resorcinol and formaldehyde were added to an ethanol solution and stirred until completely dissolved. Ammonia was then added and stirring was continued for 5 hours. Tetraethyl orthosilicate was added and reacted for 22 hours. The mixture was then centrifuged, and the precipitate was washed twice with ethanol and deionized water, respectively. After drying under vacuum at 55°C to constant weight, the precipitate was transferred to a muffle furnace and calcined at 550°C for 3 hours to obtain hollow nano-silica. The mass ratio of resorcinol, formaldehyde, ethanol solution, ammonia, and tetraethyl orthosilicate is 0.8:0.001:160:7:5.5. The ethanol solution has a mass fraction of 80%. The ammonia solution has a mass fraction of 55%.
[0020] 2. Carboxylation Silane coupling agent KH550 and succinic anhydride were added to N,N-dimethylformamide and stirred until homogeneous. Hollow nano-silica was then added and ultrasonically dispersed for 0.8 h. The mixture was then stirred at 35 °C for 2.5 h. After the reaction was completed, the mixture was repeatedly washed with anhydrous ethanol and deionized water until neutral. After drying at 55 °C to constant weight, carboxylated hollow nano-silica was obtained. The mass ratio of KH550, succinic anhydride, N,N-dimethylformamide, and hollow nano-silica is 10:4.5:65:15.
[0021] 3. Load Carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, and ferric citrate were added to deionized water, stirred thoroughly, ultrasonically dispersed for 30 minutes, and then vacuum dried at 50°C to constant weight to obtain powder A. The mass ratio of the carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, ferric citrate, and deionized water is 7:0.08:0.04:1.1:28.
[0022] 4. Surface finishing Using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed once more to obtain nano-silicon-based drug-fertilizer delivery material. The ascorbic acid solution has a mass fraction of 0.8%; The dopamine solution has a mass fraction of 0.1%.
[0023] Example 3 1. Preparation of hollow nano-silica Resorcinol and formaldehyde were added to an ethanol solution and stirred until completely dissolved. Ammonia was then added and stirring was continued for 7 hours. Tetraethyl orthosilicate was added and reacted for 26 hours. The mixture was then centrifuged, and the precipitate was washed four times with ethanol and deionized water, respectively. After drying under vacuum at 65°C to constant weight, the precipitate was transferred to a muffle furnace and calcined at 650°C for 5 hours to obtain hollow nano-silica. The mass ratio of resorcinol, formaldehyde, ethanol solution, ammonia, and tetraethyl orthosilicate is 1.2:0.003:170:8:6.5. The ethanol solution has a mass fraction of 90%. The ammonia solution has a mass fraction of 65%.
[0024] 2. Carboxylation Silane coupling agent KH550 and succinic anhydride were added to N,N-dimethylformamide and stirred until homogeneous. Hollow nano-silica was then added and ultrasonically dispersed for 1.2 h. The mixture was then stirred at 45 °C for 3.5 h. After the reaction was completed, the mixture was repeatedly washed with anhydrous ethanol and deionized water until neutral. After drying at 65 °C to constant weight, carboxylated hollow nano-silica was obtained. The mass ratio of KH550, succinic anhydride, N,N-dimethylformamide, and hollow nano-silica is 12:5.5:75:17.
[0025] 3. Load Carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, and ferric citrate were added to deionized water, stirred thoroughly, ultrasonically dispersed for 50 min, and vacuum dried at 70°C to constant weight to obtain powder A. The mass ratio of the carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, ferric citrate, and deionized water is 9:0.12:0.06:1.3:32.
[0026] 4. Surface finishing Using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed three more times to obtain nano-silicon-based drug-fertilizer delivery material. The ascorbic acid solution has a mass fraction of 1.2%. The dopamine solution has a mass fraction of 0.3%.
[0027] Example 4 1. Carboxylation of nano-silica Silane coupling agent KH550 and succinic anhydride were added to N,N-dimethylformamide and stirred until homogeneous. Then, nano-silica was added and ultrasonically dispersed for 1 hour. The mixture was then stirred at 40°C for 3 hours. After the reaction was completed, the mixture was repeatedly washed with anhydrous ethanol and deionized water until neutral. After drying at 60°C to constant weight, carboxylated nano-silica was obtained. The mass ratio of KH550, succinic anhydride, N,N-dimethylformamide, and nano-silica is 11:5:70:16.
[0028] 2. Load Carboxylated nano-silica, methyl jasmonate, pyraclostrobin, and ferric citrate were added to deionized water, stirred thoroughly, ultrasonically dispersed for 40 minutes, and then vacuum dried at 60°C to constant weight to obtain powder A. The mass ratio of the carboxylated nano-silica, methyl jasmonate, pyraclostrobin, ferric citrate, and deionized water is 8:0.1:0.05:1.2:30.
[0029] 3. Surface finishing Using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed twice more to obtain nano-silicon-based drug-fertilizer delivery material. The ascorbic acid solution has a mass fraction of 1%; The dopamine solution has a mass fraction of 0.2%.
[0030] Example 5 1. Preparation of hollow nano-silica Resorcinol and formaldehyde were added to an ethanol solution and stirred until completely dissolved. Ammonia was then added and stirring was continued for 6 hours. Tetraethyl orthosilicate was added and reacted for 24 hours. The mixture was then centrifuged, and the precipitate was washed three times with ethanol and deionized water, respectively. After drying under vacuum at 60°C to constant weight, the precipitate was transferred to a muffle furnace and calcined at 600°C for 4 hours to obtain hollow nano-silica. The mass ratio of resorcinol, formaldehyde, ethanol solution, ammonia, and tetraethyl orthosilicate is 1:0.002:165:7.5:6. The ethanol solution has a mass fraction of 85%. The ammonia solution has a mass fraction of 60%.
[0031] 2. Load Hollow nano silica, methyl jasmonate, pyraclostrobin, and ferric citrate were added to deionized water, stirred thoroughly, ultrasonically dispersed for 40 minutes, and then vacuum dried at 60°C to constant weight to obtain powder A. The mass ratio of hollow nano-silica, methyl jasmonate, pyraclostrobin, ferric citrate, and deionized water is 8:0.1:0.05:1.2:30.
[0032] 3. Surface finishing Using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed twice more to obtain nano-silicon-based drug-fertilizer delivery material. The ascorbic acid solution has a mass fraction of 1%; The dopamine solution has a mass fraction of 0.2%.
[0033] Example 6 1. Preparation of hollow nano-silica Resorcinol and formaldehyde were added to an ethanol solution and stirred until completely dissolved. Ammonia was then added and stirring was continued for 6 hours. Tetraethyl orthosilicate was added and reacted for 24 hours. The mixture was then centrifuged, and the precipitate was washed three times with ethanol and deionized water, respectively. After drying under vacuum at 60°C to constant weight, the precipitate was transferred to a muffle furnace and calcined at 600°C for 4 hours to obtain hollow nano-silica. The mass ratio of resorcinol, formaldehyde, ethanol solution, ammonia, and tetraethyl orthosilicate is 1:0.002:165:7.5:6. The ethanol solution has a mass fraction of 85%. The ammonia solution has a mass fraction of 60%.
[0034] 2. Carboxylation Silane coupling agent KH550 and succinic anhydride were added to N,N-dimethylformamide and stirred evenly. Hollow nano-silica was then added and ultrasonically dispersed for 1 hour. The mixture was then stirred at 40°C for 3 hours. After the reaction was completed, the mixture was repeatedly washed with anhydrous ethanol and deionized water until neutral. The mixture was then dried at 60°C to constant weight to obtain carboxylated hollow nano-silica. The mass ratio of KH550, succinic anhydride, N,N-dimethylformamide, and hollow nano-silica is 11:5:70:16.
[0035] 3. Load Carboxylated hollow nano-silica, pyraclostrobin, and ferric citrate were added to deionized water, stirred thoroughly, ultrasonically dispersed for 40 minutes, and vacuum dried at 60°C to constant weight to obtain powder A. The mass ratio of the carboxylated hollow nano-silica, pyraclostrobin, ferric citrate, and deionized water is 8:0.05:1.2:30.
[0036] 4. Surface finishing Using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed twice more to obtain nano-silicon-based drug-fertilizer delivery material. The ascorbic acid solution has a mass fraction of 1%; The dopamine solution has a mass fraction of 0.2%.
[0037] Test case 1. The nano-silicon-based pesticide-fertilizer delivery substances prepared in Examples 1-6 were dissolved in deionized water to prepare 1% solutions, which were then sprayed onto the corresponding apple tree experimental fields. The chlorophyll content, net photosynthetic rate, and probability of pests and diseases in the leaves were measured at the same time. The chlorophyll content and final fruit yield per acre were tested 10 and 20 days after spraying the nano-silicon-based pesticide-fertilizer delivery substances. The test results are shown in Table 1. Example 7 served as a control group, sprayed with the same amount of clean water.
[0038] Table 1
[0039] 2. The nano-silicon-based fertilizer delivery substances prepared in Examples 1 to 6 were dissolved in deionized water to prepare solutions with a mass fraction of 1%. These solutions were then sprayed onto the corresponding apple tree experimental fields. The residual rate on the leaves was tested by simulating strong winds and rainfall. The test results are shown in Table 2. Table 2
[0040] The results above show that, in Example 4, nano-silica was used instead of hollow nano-silica in the preparation of the nano-silica-based fertilizer delivery material, resulting in a reduction in the amount of drugs and nutrients it could carry. This led to varying degrees of decrease in chlorophyll content, net photosynthetic rate, and fruit yield per acre, while increasing the probability of pests and diseases. At the same time, the smooth surface of nano-silica resulted in poor adsorption of drugs and nutrients, leading to poor slow-release effect. Drugs and nutrients were released rapidly in the early stage, reducing the utilization rate of drugs and nutrients by leaves. After 10 and 20 days, the chlorophyll content dropped significantly and tended to return to normal levels. The smooth surface of nano-silica also resulted in low adhesion to leaves, leading to a low residue rate after strong winds and rainfall.
[0041] In Example 5, hollow nano-silica was used instead of carboxylated hollow nano-silica in the preparation of nano-silicon-based pesticide and fertilizer delivery material. This resulted in the prepared nano-silicon-based pesticide and fertilizer delivery material lacking carboxyl groups, which made its binding with the leaf surface less firm and its residue rate lower after strong winds and rainfall. Consequently, the chlorophyll content dropped significantly after 10 and 20 days, tending to return to normal levels. The probability of pests and diseases increased, and the yield per acre of fruit decreased.
[0042] In Example 6, during the preparation of the nano-silicon-based pesticide-fertilizer delivery material, methyl jasmonate was missing during the loading process. The role of methyl jasmonate is to actively activate plant defense signals, inducing plant leaves to actively produce transport oxalic acid and calcium ions, thereby forming calcium oxalate crystals on the leaf surface. During the formation of calcium oxalate crystals, calcium ions can simultaneously bind with the carboxyl groups in the carboxylated hollow nano-silica, thus tightly fixing the prepared nano-silicon-based pesticide-fertilizer delivery material. Therefore, the nano-silicon-based pesticide-fertilizer delivery material prepared in Example 6 has a low residual rate after strong winds and rainfall, an increased probability of pests and diseases, and a reduced fruit yield per acre.
Claims
1. A method for preparing a nano-silicon-based drug-fertilizer delivery substance, characterized in that: The preparation method includes preparing hollow nano-silica, carboxylation, loading, and surface modification. The carboxylation method is as follows: silane coupling agent KH550 and succinic anhydride are added to N,N-dimethylformamide and stirred evenly. Hollow nano-silica is then added and ultrasonically dispersed for 0.8–1.2 h. The mixture is then stirred at 35–45 °C for 2.5–3.5 h. After the reaction is complete, the mixture is repeatedly washed with anhydrous ethanol and deionized water until neutral. After drying at 55–65 °C to constant weight, carboxylated hollow nano-silica is obtained. The loading method is as follows: carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, and ferric citrate are added to deionized water, stirred thoroughly, ultrasonically dispersed for 30-50 minutes, and vacuum dried at 50-70°C to constant weight to obtain powder A.
2. The method for preparing a nano-silicon-based drug-fertilizer delivery substance according to claim 1, characterized in that: In the carboxylation method, the mass ratio of KH550, succinic anhydride, N,N-dimethylformamide, and hollow nano-silica is 10-12:4.5-5.5:65-75:15-17.
3. The method for preparing a nano-silicon-based drug-fertilizer delivery substance according to claim 1, characterized in that: In the loading method, the mass ratio of carboxylated hollow nano-silica, methyl jasmonate, pyraclostrobin, ferric citrate, and deionized water is 7–9:0.08–0.12:0.04–0.06:1.1–1.3:28–32.
4. The method for preparing a nano-silicon-based drug-fertilizer delivery substance according to claim 1, characterized in that: The method for preparing hollow nano-silica is as follows: resorcinol and formaldehyde are added to an ethanol solution and stirred until completely dissolved. Then, ammonia water is added and stirring is continued for 5-7 hours. Then, tetraethyl orthosilicate is added and reacted for 22-26 hours. After centrifugation, the precipitate is washed 2-4 times with ethanol and deionized water, respectively. Then, it is vacuum dried at 55-65°C to constant weight and transferred to a muffle furnace. It is then calcined at 550-650°C for 3-5 hours to obtain hollow nano-silica.
5. The method for preparing a nano-silicon-based drug-fertilizer delivery substance according to claim 4, characterized in that: In the method for preparing hollow nano-silica, the mass ratio of resorcinol, formaldehyde, ethanol solution, ammonia, and tetraethyl orthosilicate is 0.8–1.2:0.001–0.003:160–170:7–8:5.5–6.
5. The ethanol solution has a mass fraction of 80-90%. The mass fraction of ammonia in the solution is 55-65%.
6. The method for preparing a nano-silicon-based drug-fertilizer delivery substance according to claim 1, characterized in that: The surface modification method is as follows: using a spraying device, ascorbic acid solution is evenly sprayed onto the surface of powder A. After natural drying, dopamine solution is sprayed onto the surface. After natural drying, the dopamine solution is sprayed again 1 to 3 times to obtain nano-silicon-based drug-fertilizer delivery material.
7. The method for preparing a nano-silicon-based drug-fertilizer delivery substance according to claim 6, characterized in that: In the surface modification method, the mass fraction of the ascorbic acid solution is 0.8–1.2%. The mass fraction of the dopamine solution is 0.1% to 0.3%.