Polygala tenuifolia seed pelleting formula

Abstract

The invention relates to the technical field of agricultural science, and discloses a polygala tenuifolia seed pelleting formula which comprises polygala tenuifolia seeds, a nanocapsule material, an organic polymer adhesive, a filling agent and a multifunctional nutrition additive. The nanocapsule material comprises polylactic acid, polycaprolactone or polyethylene glycol; the organic polymer adhesive comprises polyvinyl alcohol or carboxymethyl cellulose; the filling agent comprises talcum powder, bentonite and diatomite; the multifunctional nutrition additive comprises trace elements, a stress resistance enhancer and an antibacterial agent; the trace elements comprise iron, zinc and copper, the stress resistance enhancer comprises gibberellin and salicylic acid, and the antibacterial agent comprises carbendazim and thiophanate-methyl. Microelements and a plant growth regulator are wrapped by a biodegradable nanocapsule material (such as polylactic acid, polycaprolactone or polyethylene glycol), so that nutritional ingredients can be gradually released to adapt to moisture change in soil.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural science, and in particular to a pelleting formula for polygala seeds. Background Art

[0002] Polygala tenuifolia (scientific name: Polygalatenuifolia) is a traditional Chinese medicinal material with sedative, intellectual, and expectorant effects. It is widely used in the field of traditional Chinese medicine. It belongs to the Polygalaceae family and is also known as "fine-leaved Polygala tenuifolia" or "thorny Polygala tenuifolia". In agricultural production, pelleting technology is widely used to process various seeds to improve sowing results. Traditional pelleting technology mainly combines seeds with fillers and adhesives to increase the volume and weight of seeds, making them suitable for mechanized sowing.

[0003] Existing pelletized seed technologies usually do not contain controlled-release nutrients, so the nutrient supply of seeds after sowing depends on the fertility of the soil itself, and cannot guarantee continuous nutrient support for seeds in the early growth stage. This often results in low germination rates and slow seedling growth when soil conditions are poor. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a pelletized formula for Polygala tenuifolia seeds to solve the problem that the existing pelletized seed technology usually does not contain controlled-release nutrients and cannot ensure that the seeds obtain continuous nutritional support in the early growth stage.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pelletized formula of Polygala seeds, comprising Polygala seeds, nanocapsule materials, organic polymer adhesives, fillers and multifunctional nutritional additives;

[0006] The nanocapsule material includes polylactic acid, polycaprolactone or polyethylene glycol;

[0007] The organic polymer binder includes polyvinyl alcohol or carboxymethyl cellulose;

[0008] The fillers include talc, bentonite and diatomaceous earth;

[0009] The multifunctional nutrient additive comprises trace elements, stress resistance enhancers and anti-disease agents; the trace elements comprise iron, zinc and copper, the stress resistance enhancers comprise gibberellins and salicylic acid, and the anti-disease agents comprise carbendazim and methyl-thiophanate.

[0010] Preferably, the nanocapsule material accounts for 20% to 30% of the total weight of the coating; the organic polymer binder accounts for 10% to 15% of the total weight of the coating; the filler accounts for 40% to 50% of the total weight of the coating; and the multifunctional nutritional additive accounts for 5% to 10% of the total weight of the coating.

[0011] Preferably, the polygala seed pelleting process comprises the following steps:

[0012] S1. Seed preparation: Select plump, disease-free and insect-free Polygala seeds, and clean and disinfect them;

[0013] S2. Preparation of nanocapsule materials: dissolving trace elements and plant growth regulators in water, and encapsulating them with polylactic acid, polycaprolactone or polyethylene glycol to prepare nanocapsule materials;

[0014] S3, pelleting process: placing the Polygala seeds in a pelleting device, gradually spraying the nanocapsule material, and adding an organic polymer adhesive to gradually form a uniform coating on the seed surface;

[0015] S4, drying: drying the pelletized seeds and controlling the drying temperature, time and humidity;

[0016] S5. Cooling and screening: The dried seeds are cooled to room temperature and pelletized seeds that do not meet the specifications are screened out by a screening device.

[0017] Preferably, in step S1, the disinfection treatment comprises soaking in a 0.1% potassium permanganate solution for 10 minutes and then rinsing with clean water.

[0018] Preferably, in step S2, the average particle size of the nanocapsule material is controlled to be 100-200 nanometers; and the nanocapsule material is prepared by spray drying or emulsification.

[0019] Preferably, the spray drying method sprays the solution into a drying chamber, and the temperature is controlled at 150-180° C. to obtain a nanocapsule material with uniform particle size;

[0020] The emulsification method emulsifies the solution for 30 minutes under the condition of a stirring speed of 3000-5000 rpm to form a nano-capsule material with a multi-layer structure.

[0021] Preferably, during the coating process in step S3, fillers and multifunctional nutritional additives are gradually added, and the additives are evenly distributed on the seed surface in the form of a spray and tightly combined with the seeds through an adhesive. The spray pressure is controlled at 0.2-0.4 MPa, and the stirring speed is maintained at 50-100 rpm after each spraying. The coating time is 60-90 minutes.

[0022] Preferably, in the step S4, the drying temperature is controlled at 40-50° C., the drying time is 4-6 hours, and the relative humidity is maintained at 30%-40% during the drying process.

[0023] Preferably, in step S5, the diameter of the seeds after screening is 3-5 mm.

[0024] The present invention provides a pelletized formula of Polygala tenuifolia seeds, which has the following beneficial effects:

[0025] 1. The present invention uses biodegradable nanocapsule materials (such as polylactic acid, polycaprolactone or polyethylene glycol) to encapsulate trace elements and plant growth regulators, so that the nutrients can be gradually released to adapt to the changes in soil moisture. This controlled release system can intelligently adjust the release of nutrients according to environmental changes, ensuring that seeds have sufficient nutrients at different growth stages, greatly improving nutrient utilization efficiency and reducing nutrient waste.

[0026] 2. The present invention uses a degradable organic polymer adhesive (such as polyvinyl alcohol, carboxymethyl cellulose), which can absorb moisture in a dry environment, keep the surface of the seeds moist, and prevent the seeds from losing water and drying up, thereby enhancing the resistance of the seeds. These biodegradable materials will not pollute the environment and meet the sustainable development requirements of modern agriculture.

[0027] 3. The multifunctional nutritional additive of the present invention comprises trace elements (such as iron, zinc, copper), stress resistance enhancers (such as gibberellins, salicylic acid) and antibacterial agents (such as carbendazim, methyl thiophanate). These ingredients can enhance the nutrient absorption of seeds, improve the adaptability to adverse environments, prevent and treat diseases, and ensure the healthy growth of seedlings. In particular, the addition of gibberellins and salicylic acid can not only improve the seed germination rate, but also increase the stress resistance of seeds.

[0028] 4. In the pelleting process, the present invention strictly controls the spray pressure (0.2-0.4MPa) and stirring speed (50-100 rpm) to make the coating evenly adhere to the seed surface to form stable pelletized seeds. At the same time, the diameter of the pelletized seeds is maintained at 3-5 mm, which is suitable for most mechanized sowing equipment, can effectively improve the uniformity and smoothness of sowing, and reduce uncertainty and loss in production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a process flow chart of the pelleting of Polygala seeds. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Please see attached Figure 1, the embodiment of the present invention provides a pelletized formula of Polygala seeds, including Polygala seeds, nanocapsule materials, organic polymer binders, fillers and multifunctional nutritional additives;

[0032] The nanocapsule material is used to encapsulate trace elements and plant growth regulators; the nanocapsule material is selected from polylactic acid, polycaprolactone or polyethylene glycol;

[0033] Organic polymer binders are used to maintain the stability of the coating during pelletization and to regulate water absorption; binders include polyvinyl alcohol or carboxymethyl cellulose;

[0034] Fillers include talc, bentonite and diatomaceous earth, which are used to increase the volume and weight of the pellets; talc is used to enhance the fluidity of the pellets, bentonite is used to improve the hygroscopicity of the pellets, and diatomaceous earth is used to increase the porosity of the pellets;

[0035] The multifunctional nutritional additives include trace elements, stress resistance enhancers and anti-disease agents; the trace elements are selected from iron, zinc and copper, the stress resistance enhancers include gibberellins and salicylic acid, and the anti-disease agents include carbendazim and methyl-thiophanate.

[0036] Specific, biodegradable nanocapsule materials:

[0037] Composition: selected from polylactic acid (PLA), polycaprolactone (PCL) or polyethylene glycol (PEG).

[0038] Function: Used to encapsulate trace elements (such as nitrogen, phosphorus, potassium, etc.) and plant growth regulators to form nanocapsules, which can gradually release nutrients.

[0039] Beneficial effects:

[0040] Controlled release function: The controlled release characteristics of nanocapsules can gradually release nutrients according to soil moisture, avoiding instantaneous release and loss of nutrients and improving nutrient utilization efficiency.

[0041] Environmental adaptability: Nanocapsule materials are biodegradable and gradually decompose under natural conditions without causing pollution to the environment, thus ensuring the eco-friendliness of agriculture.

[0042] Degradable organic polymer adhesives:

[0043] Composition: including polyvinyl alcohol (PVA) or carboxymethyl cellulose (CMC).

[0044] Function: Maintains coating stability during pelletizing and regulates moisture absorption.

[0045] Beneficial effects:

[0046] Coating stability: Polyvinyl alcohol and carboxymethyl cellulose can form a stable adhesive coating to ensure that other ingredients (such as nanocapsules, fillers and nutritional additives) are evenly coated on the seed surface, making the structure of pelletized seeds stable.

[0047] Moisture regulation: These adhesives have good water absorption, especially in dry conditions, they can effectively absorb surrounding moisture, help maintain the moist state of seeds, and improve seed germination rate and seedling survival rate.

[0048] Fillers:

[0049] Composition: includes talc, bentonite and diatomaceous earth.

[0050] Function: Increase the volume and weight of pellets to facilitate mechanized sowing and improve the physical properties of pellets.

[0051] Beneficial effects:

[0052] Talc: Talc can increase the fluidity of pellets, making them smoother during mechanical sowing, reducing the possibility of blockage and improving sowing efficiency.

[0053] Bentonite: Bentonite has high water absorption, which can help the pellets absorb water quickly after contacting the soil, creating more favorable conditions for seed germination. In addition, the hygroscopicity of bentonite helps keep seeds moist in arid environments.

[0054] Diatomaceous earth: Diatomaceous earth has a porous structure, which helps to improve the air permeability of the pellets, allowing for more complete air exchange between the soil and the pellets, thereby promoting healthy growth of seeds.

[0055] Multifunctional nutritional additives:

[0056] Composition: includes trace elements, stress resistance enhancers and antibacterial agents.

[0057] Function: Used to enhance the disease resistance, stress resistance and growth rate of seeds.

[0058] Beneficial effects:

[0059] Trace elements (iron, zinc, copper, etc.): These trace elements are essential nutrients for plant growth and help improve the photosynthesis efficiency and disease resistance of seedlings. For example, iron can promote the synthesis of chlorophyll, zinc can increase enzyme activity, and copper can help improve the antioxidant capacity of plants.

[0060] Stress resistance enhancers (gibberellic acid and salicylic acid): Gibberellic acid is a plant growth regulator that can accelerate seed germination and seedling growth; salicylic acid helps improve seeds' resistance to adversities such as drought and low temperature, enhances the plant's stress response, and increases seed survival rate.

[0061] Antimicrobial agents (carbendazim and methylthiophanate): These antimicrobial agents can effectively inhibit the growth of pathogens, reduce the risk of seeds and seedlings being attacked by diseases, and thus increase crop survival rate and yield.

[0062] The nanocapsule material accounts for 20% to 30% of the total weight of the coating; the organic polymer binder accounts for 10% to 15% of the total weight of the coating; the filler accounts for 40% to 50% of the total weight of the coating; and the multifunctional nutritional additive accounts for 5% to 10% of the total weight of the coating.

[0063] Specifically, the nanocapsule material accounts for 20% to 30% of the total weight of the coating:

[0064] Reason: The main function of nanocapsules is to encapsulate nutrients and growth regulators for a slow release. A ratio of 20% to 30% ensures that there are enough nanocapsules to provide a continuous supply of nutrients to the seeds when soil moisture changes after sowing. In addition, this ratio ensures that there are enough nanocapsules to cover the entire surface of the seed for uniform release.

[0065] Beneficial effects:

[0066] Controlled release performance: This ratio ensures that the number of nanocapsules is sufficient to form a uniform controlled release layer, so that the seeds can obtain appropriate amounts of nutrients at different growth stages and promote the healthy growth of seedlings.

[0067] Environmentally friendly: The lower polymer ratio also helps avoid excessive use of chemical materials, maintaining environmental friendliness, while ensuring that the seeds are not over-coated, thereby avoiding obstruction of oxygen and water circulation.

[0068] Organic polymer binder accounts for 10% to 15% of the total coating weight:

[0069] Reason: The main function of the adhesive is to evenly attach the coating material to the seed surface, ensure the stability of the coating and regulate water absorption. A ratio of 10% to 15% ensures that the coating has strong enough adhesion while not over-covering the seeds and affecting their normal water absorption and breathing.

[0070] Beneficial effects:

[0071] Stability: This ratio enables the coating to maintain good adhesion during the coating process, ensuring that other ingredients (such as nanocapsules and fillers) are evenly attached to the seed surface and avoid falling off or delamination.

[0072] Water absorption regulation: Polyvinyl alcohol (PVA) or carboxymethyl cellulose (CMC) can effectively absorb water when the soil is dry, ensuring the moisture of the seeds and improving their germination rate. This ratio can moderately regulate the use of water in the soil without affecting the natural water absorption of the seeds.

[0073] Fillers make up 40% to 50% of the total coating weight:

[0074] Reason: The main function of fillers is to increase the volume and weight of the pellets to facilitate mechanized sowing and improve the physical properties of the pellets. A ratio of 40% to 50% ensures that the density of the pellets is moderate, not too light to be difficult to sow, nor too dense to affect the penetration of water and oxygen.

[0075] Beneficial effects:

[0076] Increased volume: A relatively high proportion of fillers such as talc, bentonite and diatomaceous earth can make the pellets reach a volume suitable for mechanical seeding. This is very important for seeding equipment used in modern agriculture to ensure fluidity during seeding and avoid clogging the seeding machine.

[0077] Porosity and hygroscopicity: The addition of bentonite and diatomaceous earth makes the coating porous and has good hygroscopicity, thereby improving the pellets' ability to absorb water in the soil. This ratio also optimizes the pellets' air permeability, helping to maintain the seeds' physiological activity.

[0078] Multifunctional nutritional additives make up 5% to 10% of the total coating weight:

[0079] Reason: The role of multifunctional nutrient additives is to provide seeds with additional trace elements, stress resistance enhancers and anti-disease agents. A ratio of 5% to 10% can provide seeds with sufficient nutrients without causing excessive chemical burden, helping seedlings to grow quickly and resist diseases under adverse environmental conditions.

[0080] Beneficial effects:

[0081] Nutritional Enhancement: This ratio ensures that the seeds receive the necessary trace element support, such as iron, zinc, copper, etc., in the early stages of germination to promote the healthy growth of seedlings. The lower ratio also avoids excessive chemical burden on the seeds, ensuring their safety and stability.

[0082] Stress and disease resistance: Additives such as gibberellins, salicylic acid, and carbendazim at this ratio can enhance the stress and disease resistance of seeds and reduce germination failures caused by adverse environmental conditions (such as drought or low temperature) or pathogens. Reasonable ratios ensure the gradual release of these substances in the soil, avoiding toxicity or waste.

[0083] The polygala seed pelleting process is characterized in that the polygala seed pelleting formula used in any one of claims 1 to 3 comprises the following steps:

[0084] S1. Seed preparation: Select plump, disease-free and insect-free Polygala seeds, and clean and disinfect them;

[0085] S2. Preparation of nanocapsule materials: dissolving trace elements and plant growth regulators in water, and encapsulating them with polylactic acid, polycaprolactone or polyethylene glycol to prepare nanocapsule materials;

[0086] S3, pelleting process: placing the Polygala seeds in a pelleting device, gradually spraying the nanocapsule material, and adding an organic polymer adhesive to gradually form a uniform coating on the seed surface;

[0087] S4, drying: drying the pelletized seeds and controlling the drying temperature, time and humidity;

[0088] S5. Cooling and screening: The dried seeds are cooled to room temperature and pelletized seeds that do not meet the specifications are screened out by a screening device.

[0089] In step S1, the disinfection treatment includes soaking in a 0.1% potassium permanganate solution for 10 minutes and then rinsing with clean water.

[0090] In step S2, the average particle size of the nanocapsule material is controlled to be 100-200 nanometers; the nanocapsule material is prepared by a spray drying method or an emulsification method.

[0091] The spray drying method sprays the solution into a drying chamber, and the temperature is controlled at 150-180°C to obtain nanocapsule materials with uniform particle size;

[0092] The emulsification method emulsifies the solution for 30 minutes at a stirring speed of 3000-5000 rpm to form a multi-layered nanocapsule material.

[0093] During the coating process in step S3, fillers and multifunctional nutrient additives are gradually added. The additives are evenly distributed on the seed surface in the form of spray and tightly combined with the seeds through adhesives. The spray pressure is controlled at 0.2-0.4MPa. After each spraying, the stirring speed is maintained at 50-100 rpm and the coating time is 60-90 minutes.

[0094] In step S4, the drying temperature is controlled at 40-50° C., and the drying time is 4-6 hours; and the relative humidity is maintained at 30%-40% during the drying process.

[0095] In step S5, the diameter of the seeds after screening is 3-5 mm.

[0096] Specifically, S1. Seed preparation

[0097] Steps: Select plump, pest-free Polygala seeds, first clean them to remove impurities and dirt on the surface of the seeds. Then disinfect them by soaking them in 0.1% potassium permanganate solution for 10 minutes, then rinse them with clean water and dry them in a cool place.

[0098] Beneficial effects:

[0099] Improved seed health: The cleaning step removes surface dust and impurities that could affect pelleting and seed germination in subsequent processes.

[0100] Disinfection effect: Soaking in 0.1% potassium permanganate solution for 10 minutes can effectively kill pathogens and parasites on the surface of seeds, reduce the risk of seeds carrying diseases, and thus increase seed survival rate and germination rate.

[0101] Safe handling: Potassium permanganate is a commonly used disinfectant that is safe and harmless to seeds and easy to operate, ensuring that the seeds remain healthy and active during the disinfection process.

[0102] S2. Preparation of Nanocapsule Materials

[0103] Steps: Dissolve trace elements and plant growth regulators in water, use polylactic acid (PLA), polycaprolactone (PCL) or polyethylene glycol (PEG) to encapsulate and prepare nanocapsule materials. The average particle size of the nanocapsule materials is controlled at 100-200 nanometers. Nanocapsule preparation can be done by spray drying or emulsification:

[0104] Spray drying method: Spray the solution into the drying chamber and control the temperature at 150-180°C to obtain nanocapsule materials with uniform particle size.

[0105] Emulsification method: The solution is emulsified for 30 minutes at a stirring speed of 3000-5000 rpm to form a multi-layered nanocapsule material.

[0106] Beneficial effects:

[0107] Improve nutrient utilization: Nanocapsules are used to encapsulate nutrients so that they can be released slowly when soil moisture changes, avoiding waste caused by instantaneous release, thereby improving nutrient utilization efficiency.

[0108] Nano-scale particle size control: The average particle size of nanocapsules is controlled at 100-200 nanometers, which helps to improve the adhesion of nanocapsules to seeds, ensure that nutrients can be gradually released, and support the continuous growth of seeds.

[0109] Process adaptability: Spray drying and emulsification methods are each adapted to different formulation requirements. Spray drying is suitable for the preparation of smaller particle sizes, while emulsification is suitable for capsules that require multi-layer structures and gradual release, providing a variety of release characteristics.

[0110] S3. Pelletizing process

[0111] Step description: Place the Polygala seeds in the pelletizing equipment, gradually spray the nanocapsule material, and add the organic polymer adhesive to gradually form a uniform coating on the seed surface. During the coating process, gradually add fillers (talcum powder, bentonite, diatomaceous earth) and multifunctional nutritional additives, evenly distribute them on the seed surface in the form of spray, and tightly combine with the seeds through the adhesive. The spray pressure is controlled at 0.2-0.4MPa, and the stirring speed is maintained at 50-100 rpm after each spraying. The coating time is 60-90 minutes.

[0112] Beneficial effects:

[0113] Uniform coating formation: By gradually spraying nanocapsules and nutrient additives and adjusting the spray pressure (0.2-0.4MPa) and stirring speed (50-100 rpm), it is possible to ensure that the coating is evenly and firmly attached to the seed surface, thereby improving the quality of the pellets.

[0114] Effective combination of materials: Adding organic polymer adhesives allows fillers and nutritional additives to be tightly combined on the seed surface, enhancing the strength and stability of the seed surface and preventing the coating from falling off.

[0115] Improve sowing efficiency: Through the pelletizing process, the seed volume and weight are increased, and the spherical pellets formed are more suitable for mechanized sowing, avoiding blockage and uneven distribution during sowing.

[0116] S4. Drying

[0117] Step description: Dry the pelletized seeds at a temperature of 40-50° C. for 4-6 hours, and keep the relative humidity at 30%-40% during the drying process.

[0118] Beneficial effects:

[0119] Stabilize the coating: Controlling the drying temperature at 40-50℃ can effectively remove moisture from the coating, avoid high temperature affecting the activity of seeds, and maintain good germination ability of seeds.

[0120] Prevent over-drying: Control the relative humidity at 30%-40% to avoid over-drying of seeds and coatings, which may cause cracking or falling off of the coatings, while maintaining the biological activity of the seeds to ensure their subsequent germination and growth performance.

[0121] Uniform drying: Through appropriate drying time (4-6 hours), the inside and surface of the pellets are ensured to reach a consistent degree of dryness, thereby improving the quality stability of the pellets.

[0122] S5. Cooling and screening

[0123] Step description: After drying, the seeds are cooled to room temperature and the pelletized seeds that do not meet the specifications are screened out through a screening device to ensure that the seed diameter is 3-5 mm.

[0124] Beneficial effects:

[0125] Maintain seed activity: Cool to room temperature quickly after drying to avoid the continued impact of high temperature residue on seed activity and maintain the ability of seeds to germinate.

[0126] Ensure uniform specifications: Use a screening device to screen out pelletized seeds that do not meet diameter specifications, ensuring that the pelletized seeds are between 3-5 mm. This diameter range ensures that the seeds have good fluidity and adaptability during mechanized sowing, and improves the uniformity and efficiency of sowing.

[0127] Reduce waste: Seeds after screening can be classified and processed, and seeds that do not meet the specifications can be reprocessed or used for other purposes, maximizing the use of resources and reducing waste.

[0128] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pelletized formula of Polygala seeds, characterized in that: It includes Polygala seeds, nanocapsule materials, organic polymer adhesives, fillers and multifunctional nutritional additives; The nanocapsule material includes polylactic acid, polycaprolactone or polyethylene glycol; The organic polymer binder includes polyvinyl alcohol or carboxymethyl cellulose; The fillers include talc, bentonite and diatomaceous earth; The multifunctional nutrient additive comprises trace elements, stress resistance enhancers and anti-disease agents; the trace elements comprise iron, zinc and copper, the stress resistance enhancers comprise gibberellins and salicylic acid, and the anti-disease agents comprise carbendazim and methyl-thiophanate.

2. The pelletized formula of Polygala seeds according to claim 1, characterized in that: The nanocapsule material accounts for 20% to 30% of the total weight of the coating; the organic polymer binder accounts for 10% to 15% of the total weight of the coating; the filler accounts for 40% to 50% of the total weight of the coating; and the multifunctional nutritional additive accounts for 5% to 10% of the total weight of the coating.

3. A pelleting process for polygala seeds, characterized in that: The pelleting formula for polygala seeds according to any one of claims 1 to 3 comprises the following steps: S1. Seed preparation: Select plump, disease-free and insect-free Polygala seeds, and clean and disinfect them; S2. Preparation of nanocapsule materials: dissolving trace elements and plant growth regulators in water, and encapsulating them with polylactic acid, polycaprolactone or polyethylene glycol to prepare nanocapsule materials; S3, pelleting process: placing the Polygala seeds in a pelleting device, gradually spraying the nanocapsule material, and adding an organic polymer adhesive to gradually form a uniform coating on the seed surface; S4, drying: drying the pelletized seeds and controlling the drying temperature, time and humidity; S5. Cooling and screening: The dried seeds are cooled to room temperature and pelletized seeds that do not meet the specifications are screened out by a screening device.

4. The pelleting process of Polygala seeds according to claim 3, characterized in that: In the step S1, the disinfection treatment includes soaking in a 0.1% potassium permanganate solution for 10 minutes and then rinsing with clean water.

5. The pelleting process of Polygala seeds according to claim 3, characterized in that: In the step S2, the average particle size of the nanocapsule material is controlled to be 100-200 nanometers; the nanocapsule material is prepared by a spray drying method or an emulsification method.

6. The pelleting process of Polygala seeds according to claim 5, characterized in that: The spray drying method sprays the solution into a drying chamber, and the temperature is controlled at 150-180°C to obtain a nanocapsule material with uniform particle size; The emulsification method emulsifies the solution for 30 minutes under the condition of a stirring speed of 3000-5000 rpm to form a nano-capsule material with a multi-layer structure.

7. The pelleting process of polygala seeds according to claim 3, characterized in that: During the coating process in step S3, fillers and multifunctional nutritional additives are gradually added. The additives are evenly distributed on the seed surface in the form of a spray and are tightly combined with the seeds through an organic polymer adhesive. The spray pressure is controlled at 0.2-0.4 MPa. After each spraying, the stirring speed is maintained at 50-100 rpm, and the coating time is 60-90 minutes.

8. The pelleting process of Polygala seeds according to claim 3, characterized in that: In the step S4, the drying temperature is controlled at 40-50° C., and the drying time is 4-6 hours; and the relative humidity is maintained at 30%-40% during the drying process.

9. The pelleting process of Polygala seeds according to claim 3, characterized in that: In the step S5, the diameter of the seeds after screening is 3-5 mm.

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