Plant fertilizer additive, solid-state mixed hydrogen fertilizer and preparation method of solid-state mixed hydrogen fertilizer

Abstract

The invention provides a plant fertilizer additive, a solid mixed hydrogen fertilizer and a preparation method. The plant fertilizer additive comprises magnesium hydride, calcium hydride and diatomaceous earth, the magnesium hydride serves as a main agent, the calcium hydride serves as a first auxiliary agent, and the diatomaceous earth serves as a second auxiliary agent. According to the technical scheme, hydrogen fertilizer supplement can be stably provided for plants, meanwhile, the cost is low, the preparation method is safe, and the fertilizer stability is good.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen materials, and in particular to a plant fertilizer additive and a solid mixed hydrogen fertilizer and a preparation method thereof. Background Art

[0002] Hydrogen is one of the essential nutrients for plant growth. In recent years, agricultural research has found that hydrogen molecules can improve plant resistance, regulate plant growth and development, and preserve vegetables, fruits and flowers for a long time. Based on the positive effects of hydrogen molecules on plants, researchers have proposed the concept of "hydrogen fertilizer" and formally used hydrogen as a fertilizer for production research.

[0003] With the increasing attention to environmental protection and efficient agriculture, some studies have begun to explore the possibility of directly using hydrogen or hydrogen-rich compounds as new fertilizers. As we all know, the most widely used plant fertilizers on the market are nitrogen fertilizers, including urea, ammonium nitrate, etc. In recent years, for example, some microorganisms can fix nitrogen in the air, and can use hydrogen as an energy source for biological nitrogen fixation under certain conditions, or how to apply hydrogen directly to the soil to promote plant growth. For example, the domestic invention patent CN201210154005.0 discloses a hydrogen-rich liquid plant growth regulator and its preparation method and application, which discloses that hydrogen is passed into water or nutrient solution to obtain a hydrogen-rich plant growth regulator to promote plant growth and development and morphological construction, and enhance plant metabolic capacity. For another example, the invention patent CN202211736746.X discloses a hydrogen-containing fertilizer and its preparation method and application, which solves the application difficulties of gaseous hydrogen and electrolysis of water to prepare hydrogen-rich water, and can be applied on a large scale. However, the existing technology has extremely high requirements for the transportation, use and storage of gaseous hydrogen, which is flammable and explosive, and the solubility of hydrogen in water is low, the escape rate in water is fast, and it is difficult to store stably. In addition, a large amount of hydrogen is wasted in the process of preparing hydrogen water. Therefore, the current patented technologies have certain limitations and cannot be widely promoted.

[0004] Therefore, a technical solution is needed that can stably provide hydrogen fertilizer supplements to plants, while having low cost, safe preparation method and good fertilizer stability. Summary of the invention

[0005] The present application aims to provide a plant fertilizer additive and a hydrogen fertilizer and a preparation method, which can stably provide hydrogen fertilizer supplements for plants, while having low cost, safe preparation method and good fertilizer stability.

[0006] According to one aspect of the present application, a plant fertilizer additive is provided, comprising: magnesium hydride, calcium hydride and diatomaceous earth, wherein the magnesium hydride is a main agent, the calcium hydride is a first auxiliary agent, and the diatomaceous earth is a second auxiliary agent.

[0007] According to some embodiments, the total mass percentage concentration of hydrogen in the plant fertilizer additive is 0.1 to 35 wt %.

[0008] According to some embodiments, the plant fertilizer additive contains magnesium in a total mass percentage concentration of 0.1 to 15 wt %.

[0009] According to some embodiments, the plant fertilizer additive contains calcium in a total mass percentage concentration of 0.1 to 3 wt %.

[0010] According to some embodiments, in the plant fertilizer additive, the concentration ratio of magnesium hydride to calcium hydride is 10-15:1-3.

[0011] According to some embodiments, magnesium hydride, calcium hydride and diatomaceous earth, the mass percentage concentration of the magnesium hydride is 0.1-15wt%; the mass percentage concentration of the calcium hydride is 0.1-3wt%, and the rest is diatomaceous earth.

[0012] According to one aspect of the present application, there is provided a method for preparing the plant fertilizer additive as described in any one of the above, comprising:

[0013] Prepare magnesium hydride and calcium hydride nanoparticles respectively, wherein the specific surface area of ​​the calcium hydride nanoparticles is greater than the specific surface area of ​​the magnesium hydride nanoparticles, so that the calcium hydride nanoparticles react with water before the magnesium hydride nanoparticles;

[0014] The magnesium hydride and calcium hydride nanoparticles and diatomaceous earth are mixed according to the plant fertilizer additive ratio as described in any one of the above items to obtain the plant fertilizer additive.

[0015] According to some embodiments, magnesium hydride and calcium hydride nanoparticles are prepared separately, comprising:

[0016] Using high-purity magnesium powder as raw material, ball milling is performed in a ball milling equipment;

[0017] The ball-milled magnesium powder is heated to a certain temperature in a high-pressure hydrogen environment to fully absorb hydrogen to generate magnesium hydride, thereby obtaining magnesium hydride nanoparticles.

[0018] According to one aspect of the present application, there is provided a method for applying the plant fertilizer additive as described in any one of the above items, wherein the prepared plant fertilizer additive is mixed with other fertilizers used in conventional planting processes, and when the plant fertilizer additive is applied, it is directly mixed with other fertilizers and spread or applied in holes.

[0019] According to one aspect of the present application, a solid mixed hydrogen fertilizer is provided, the hydrogen fertilizer comprising a basic fertilizer and the plant fertilizer additive as described above, the basic fertilizer and the plant fertilizer additive being mixed in a ratio of 0-30%.

[0020] According to some embodiments, the basic fertilizer includes one or more of urea, double superphosphate, ordinary superphosphate, calcium magnesium phosphate, potassium sulfate, potassium chloride, ammonium sulfate, ammonium nitrate, monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, potassium nitrate, ammonium nitrate, calcium nitrate, and calcium ammonium nitrate.

[0021] According to the embodiments of the present application, by applying the magnesium hydride as the main agent, it is possible to supplement the magnesium element while stably supplementing the hydrogen element for the plants, and it is also possible to adjust the soil pH value; by adding the calcium hydride, heat is provided for the decomposition of the magnesium hydride, and the hydrogen fertilizer content is further increased; by adding the diatomaceous earth, it is possible to improve the soil structure while increasing the air permeability and drainage, helping to retain moisture and the nutrients of the additive itself, and preventing diseases and insect pests.

[0022] According to some embodiments, the design of the present invention also provides a solid mixed hydrogen fertilizer, which is obtained by mixing the basic fertilizer with the plant fertilizer additive in a ratio of 0-30%, thereby providing stable hydrogen fertilizer supplementation for plants. The present invention has wide applications, is easy to use, has low cost, a safe preparation method, and good fertilizer stability.

[0023] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0025] Figure 1 A flow chart of a method for preparing a plant fertilizer additive according to an exemplary embodiment is shown. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0027] It is particularly important to point out that similar substitutions and modifications made to the present invention are obvious to those skilled in the art, and they are all considered to be included in the present invention. Relevant personnel can obviously modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0028] If no specific conditions are specified in the present invention, the process is carried out under conventional conditions or conditions recommended by the manufacturer. The raw materials or excipients used, as well as the reagents or instruments used, whose manufacturers are not specified, are all conventional products that can be obtained commercially.

[0029] According to the technical concept of the present application, a plant fertilizer additive and a hydrogen fertilizer and a preparation and application method are provided, which can stably provide hydrogen fertilizer supplements for plants, and at the same time, the cost is low, the preparation method is safe, and the fertilizer has good stability. According to the embodiment, by using the magnesium hydride as the main agent, the magnesium element can be supplemented while the hydrogen element is stably supplemented for the plant, and the soil pH value can also be adjusted; by adding the calcium hydride, heat is provided for the decomposition of the magnesium hydride, and the hydrogen fertilizer content is further increased; by adding the diatomaceous earth, the air permeability and drainage can be increased while improving the soil structure, helping to retain moisture and the nutrients of the additive itself, and preventing diseases and insect pests.

[0030] The exemplary embodiments of the present application are described below in conjunction with the accompanying drawings.

[0031] In order to overcome the deficiencies of the prior art, the present invention aims to provide a plant fertilizer additive, comprising: magnesium hydride, calcium hydride and diatomaceous earth, wherein the magnesium hydride is a main agent, the calcium hydride is a first auxiliary agent, and the diatomaceous earth is a second auxiliary agent.

[0032] According to some embodiments, the plant fertilizer additive uses magnesium hydride (MgH2) as a main agent, which can provide magnesium and hydrogen elements in the fertilizer. Although the magnesium hydride itself is not a direct plant nutrient, it can release hydrogen after decomposition and dissolve in the soil solution to adjust the soil acid-base environment.

[0033] According to some embodiments, the plant fertilizer additive uses calcium hydride (CaH2) as a first auxiliary agent to provide hydrogen fertilizer to plants while supplementing calcium. It is also a strong reducing agent that can react with water to generate hydrogen and calcium oxide (CaO) and release a large amount of heat at the same time, providing temperature for the decomposition and reaction of magnesium hydride. The calcium hydride can also change the soil pH value, which helps to improve acidic soil conditions.

[0034] According to some embodiments, the plant fertilizer additive uses diatomaceous earth as a second adjuvant, which, in addition to physical properties such as increasing soil permeability and drainage, may also be used to adjust the proportion of other ingredients to ensure the stability and applicability of the product.

[0035] According to some embodiments, the plant fertilizer additive contains a total mass percentage concentration of hydrogen of 0.1 to 35 wt%. The plant fertilizer additive contains hydrogen elements of 0.1% to 35%, and this high content of hydrogen mainly comes from magnesium hydride (MgH2) and calcium hydride (CaH2), because these two components are the main components of the fertilizer additive. When these hydrides come into contact with moisture in the soil, they decompose to produce hydrogen and alkaline byproducts, such as magnesium oxide and calcium oxide, which can help improve the pH value of acidic soil, thereby facilitating plant growth. Part of the hydrogen released when reacting with water dissolves in the soil solution and is used to improve soil conditions (such as pH adjustment), and the other part is used as part of gas fertilization in a controlled environment. If it is applied in a controlled environment, such as greenhouse cultivation, the released hydrogen can be further converted into a form that can be used by plants, for example: by mixing with other gases to promote photosynthesis and other processes. In addition, these reactions can also generate heat, such as promoting seed germination or increasing soil temperature.

[0036] According to some embodiments, the plant fertilizer additive contains magnesium in a total mass percentage concentration of 0.1 to 15 wt%. In the plant fertilizer additive, magnesium accounts for 0.1% to 15%. This magnesium content mainly comes from magnesium hydride (MgH2) because it is one of the main components of the fertilizer additive. Magnesium is one of the nutrients necessary for plant growth and plays a vital role in plant physiological functions. Magnesium is one of the core components of chlorophyll and is essential for photosynthesis. Lack of magnesium can cause leaf yellowing and affect plant energy production. Magnesium is involved in the activation of multiple enzyme systems, which play an important role in carbohydrate metabolism, nucleic acid synthesis, and protein synthesis. Magnesium helps maintain ion balance in cells and promotes the absorption and transportation of other mineral nutrients such as phosphorus and calcium. A magnesium content of 0.1 to 15 wt% can effectively supplement the magnesium deficiency that may exist in the soil, especially in places where long-term cultivation or the soil itself has a low magnesium content. When magnesium hydride reacts with water, in addition to releasing hydrogen, it also produces magnesium oxide (MgO), which can help improve the pH of acidic soils, making the soil environment more suitable for plant growth.

[0037] According to some embodiments, the total mass percentage concentration of calcium in the plant fertilizer additive is 0.1-3wt%. In the plant fertilizer additive, calcium accounts for 0.1% to 3%, and the calcium content mainly comes from calcium hydride (CaH2). Calcium is an important component of the cell wall and helps to maintain the strength and stability of the cell wall, thereby enhancing the overall structure and lodging resistance of the plant. Calcium participates in the signal transduction process within the cell and regulates a variety of physiological reactions, such as stomatal opening and closing, ion transport, etc. Calcium, as an activator or cofactor of many enzymes, participates in multiple metabolic pathways, including photosynthesis, respiration, and protein synthesis. Calcium is very important for the normal development of root apical meristems, which can promote healthy root growth and improve the ability of plants to absorb water and other nutrients. Adequate calcium supply can improve fruit hardness, extend storage period, and reduce the occurrence of certain physiological diseases, such as bitter pit disease of apples and navel rot of tomatoes. In the plant fertilizer additive, the calcium content of 0.1-3wt% can effectively supplement the calcium deficiency that may exist in the soil, especially in those places where long-term cultivation or the soil itself has a low calcium content.

[0038] According to some embodiments, when calcium hydride reacts with water, in addition to releasing hydrogen, calcium oxide (CaO), i.e. slaked lime, is also generated, which can help neutralize acidic soil, increase pH, and improve the soil environment for plant growth. This ratio can meet the calcium needs of most crops without causing negative effects caused by excessive calcium.

[0039] According to some embodiments, in the plant fertilizer additive, the concentration ratio of the magnesium hydride and calcium hydride is 10-15:1-3. In the plant fertilizer additive, the concentration ratio of magnesium hydride (MgH2) and calcium hydride (CaH2) is 10-15:1-3, and the magnesium hydride is the main agent in the formula, while calcium hydride is added as an auxiliary agent in a smaller proportion. Plants have a relatively large demand for magnesium, especially in the process of photosynthesis, where sufficient magnesium is needed to synthesize chlorophyll. Therefore, a higher ratio of magnesium hydride can ensure that sufficient magnesium is provided to support the healthy growth of plants. Although calcium is also an essential nutrient for plants, its demand is usually lower than that of magnesium. An appropriate amount of calcium helps maintain cell wall structure, promote root development, etc. By maintaining a lower ratio of calcium hydride, the problem of excessive calcium can be avoided while meeting the calcium needs of plants. Both magnesium hydride and calcium hydride react easily with water to generate hydrogen and magnesium oxide or calcium oxide, respectively. A higher magnesium hydride ratio could mean more hydrogen gas release, which could be exploited for gas fertilization or other purposes in certain controlled environments (such as greenhouses); while a lower calcium hydride ratio could control the amount of alkaline byproduct produced, allowing for better management of soil pH changes.

[0040] According to some embodiments, magnesium hydride and calcium hydride are mixed in a ratio of 10-15:1-3, which can optimize the effects of these two components in plant fertilizer additives, not only effectively provide the magnesium and calcium elements required by plants, but also improve the crop growth environment by adjusting the soil pH value and possible gas fertilization effects.

[0041] According to some embodiments, magnesium hydride, calcium hydride and diatomaceous earth, the mass percentage concentration of magnesium hydride is 0.1-15wt%; the mass percentage concentration of calcium hydride is 0.1-3wt%, and the rest is diatomaceous earth. Although appropriate amounts of magnesium and calcium help to improve soil structure, excessive amounts may change the physical properties of the soil and affect its air permeability and drainage capacity. This ratio can not only meet the needs of most crops for magnesium and calcium, but also will not cause negative effects caused by excessive magnesium and calcium. The diatomaceous earth serves as a filling material and carrier in the plant fertilizer additive, increases soil permeability and drainage, and helps to retain moisture and nutrients. Diatomaceous earth can also be used as a mechanical insecticide to destroy insect exoskeletons. Since magnesium hydride and calcium hydride are both active metal hydrides, they are prone to violent reactions with water under humid conditions. Therefore, the presence of diatomaceous earth not only serves as a filler, but also plays a diluting role, reducing the activity of these two components and improving the safety and stability of the product. The plant fertilizer additive combines the advantages of magnesium hydride, calcium hydride and diatomaceous earth to optimize the supply of magnesium and calcium required by plants while improving soil conditions and taking into account the safety and stability of the product in practical applications.

[0042] Figure 1 A flow chart of a method for preparing a plant fertilizer additive according to an exemplary embodiment is shown.

[0043] See also Figure 1 , the figure shows a process flow of a method for preparing a plant fertilizer additive according to an exemplary embodiment. The object of the present invention is also to provide a method for preparing a plant fertilizer additive as described in any one of the above items, comprising:

[0044] In S101, magnesium hydride and calcium hydride nanoparticles are prepared respectively, wherein the specific surface area of ​​the calcium hydride nanoparticles is greater than the specific surface area of ​​the magnesium hydride nanoparticles, so that the calcium hydride nanoparticles react with water before the magnesium hydride nanoparticles.

[0045] According to some embodiments, magnesium hydride and calcium hydride nanoparticles are prepared using physical and chemical methods (such as mechanical ball milling, sol-gel method, thermal decomposition, etc.), wherein the preparation conditions are controlled so that the magnesium hydride obtains a relatively small specific surface area, for example, by adjusting the ball milling time or temperature to reduce the growth rate of the particle size, thereby reducing the rate of its reaction with water. By increasing the specific surface area of ​​the calcium hydride nanoparticles, it can react faster when it contacts water, release hydrogen and generate calcium oxide (CaO), thereby rapidly changing the pH value of the local environment. The magnesium hydride nanoparticles react slowly with water due to their small specific surface area, so they can gradually play a role after the calcium hydride reaction, avoiding the one-time release of too much hydrogen or alkaline substances.

[0046] In S103, the magnesium hydride and calcium hydride nanoparticles and diatomaceous earth are mixed according to the plant fertilizer additive ratio described in any one of the above items to obtain the plant fertilizer additive.

[0047] According to some embodiments, the components are accurately weighed according to the ratio specified above (magnesium hydride 0.1-15wt%, calcium hydride 0.1-3wt%, and the remainder is diatomaceous earth). The pre-prepared magnesium hydride and calcium hydride nanoparticles are uniformly mixed with the diatomaceous earth. A high shear mixer or other efficient mixing equipment can be used to ensure that the components are fully dispersed to form a uniform mixture.

[0048] According to some embodiments, sampling and analysis are performed during the entire mixing process to ensure that the proportions of the components meet the design requirements, and the finished product is tested for particle size distribution, specific surface area, etc. to ensure stable and reliable product quality. If necessary, the mixed material can be subjected to low-temperature drying to remove any trace moisture that may exist, further improving the stability of the product.

[0049] According to some embodiments, during the entire preparation process, especially in the mixing and packaging stages, humidity must be strictly controlled to prevent the nanoparticles from coming into contact with moisture in the air in advance and causing unnecessary reactions. Considering that both magnesium hydride and calcium hydride are active metal hydrides, all operations should be performed in a well-ventilated environment and necessary personal protective measures (such as wearing gloves, goggles, etc.) should be taken.

[0050] According to some embodiments, the plant fertilizer additive prepared by this method can not only provide an appropriate amount of magnesium and calcium to support plant growth, but also improve soil conditions by adjusting the soil pH value. In addition, by controlling the reaction order of the two hydrides, their activity performance in the soil can be better managed, thereby improving the effectiveness and safety of the fertilizer.

[0051] According to some embodiments, by precisely controlling the specific surface area of ​​magnesium hydride and calcium hydride nanoparticles, the effect of calcium hydride nanoparticles reacting preferentially with water is achieved, thereby optimizing the function and application effect of the plant fertilizer additive. This innovative method not only improves the efficiency of the fertilizer, but also enhances the safety and convenience of use.

[0052] According to some embodiments, magnesium hydride and calcium hydride nanoparticles are prepared separately, including: using high-purity magnesium powder as a raw material and performing ball milling in a ball milling device; heating the ball-milled magnesium powder to a certain temperature in a high-pressure hydrogen environment so that it fully absorbs hydrogen to generate magnesium hydride, thereby obtaining magnesium hydride nanoparticles.

[0053] 1. Raw material preparation

[0054] Selection of raw materials: Use high-purity (99.9% or more) magnesium powder as the starting raw material to ensure the purity of the final product.

[0055] 2. Ball milling

[0056] Selection of ball milling equipment: Use planetary ball mill or other types of high-efficiency ball milling equipment, which can grind magnesium powder to nanometer level in a short time.

[0057] Ball milling parameter settings:

[0058] Ball-to-material ratio: usually 10:1 to 20:1, that is, the mass of the ball is 10 to 20 times the mass of the magnesium powder.

[0059] Speed: Set the appropriate speed, generally between 300 and 600 rpm, depending on the ball mill model used.

[0060] Time: The ball milling time ranges from several hours to dozens of hours, and the specific time needs to be optimized based on the experimental results.

[0061] Atmosphere protection: In order to prevent magnesium powder from oxidation, an inert gas (such as argon or helium) should be introduced for protection during the ball milling process.

[0062] After ball milling, the particle size of magnesium powder is significantly reduced to form nano-scale particles, while its reactivity is increased.

[0063] 3. Hydrogenation

[0064] Hydrogenation unit: Use a specially designed high-pressure hydrogenation furnace or reactor. The equipment should have good sealing performance and be able to withstand high pressure and temperature.

[0065] Hydrogenation conditions:

[0066] Hydrogen purity: Use high purity (99.999%) hydrogen to avoid the influence of impurities on the product.

[0067] Pressure: Apply appropriate pressure (usually 5MPa to 10MPa) to promote the magnesium powder to fully absorb hydrogen.

[0068] Temperature: Heating to a certain temperature (e.g. 300°C to 400°C) to ensure that the magnesium powder is fully in contact with the hydrogen and a hydrogenation reaction occurs.

[0069] Time: Maintain a certain reaction time (several hours) to ensure that the magnesium powder is completely converted into magnesium hydride.

[0070] Cooling: After the reaction is completed, slowly lower the temperature and release the hydrogen pressure to ensure safe operation.

[0071] 4. Post-cooling treatment

[0072] Collection: After the reactor has cooled to room temperature, carefully open it and collect the magnesium hydride nanoparticles.

[0073] Storage: Because magnesium hydride is very reactive, it must be stored in dry, airtight containers away from air and moisture to prevent premature reaction.

[0074] By means of the above method, high-purity magnesium hydride nanoparticles can be effectively prepared. These particles have a large surface area and high reactivity and are suitable for further preparation of plant fertilizer additives.

[0075] Similarly, for the preparation of calcium hydride nanoparticles, the above method can also be used, using high-purity calcium powder as the starting material. The hardness of calcium powder is relatively low, and the ball milling parameters may need to be adjusted, such as reducing the ball-to-material ratio or reducing the rotation speed to avoid excessive grinding and resulting in too fine particles. The hydrogenation temperature and pressure of calcium may vary. Generally, the hydrogenation temperature of calcium is slightly lower than that of magnesium. The specific conditions need to be adjusted according to the actual situation.

[0076] This method ensures that the preparation process of the two nanoparticles is both safe and effective, laying the foundation for their subsequent mixing to make plant fertilizer additives.

[0077] The present invention also provides a method for applying the plant fertilizer additive as described in any one of the above items, wherein the prepared plant fertilizer additive is mixed with other fertilizers used in conventional planting processes. When applying the plant fertilizer additive, the plant fertilizer additive is directly mixed with other fertilizers for broadcasting or hole application.

[0078] According to some embodiments, the plant fertilizer additive can be flexibly mixed with other fertilizers used in conventional planting processes and can be applied in a variety of ways. The prepared plant fertilizer additive is mixed evenly with conventional fertilizers, such as nitrogen fertilizer, phosphorus fertilizer, potash fertilizer, etc., in appropriate proportions, and a mechanical stirrer or other mixing equipment can be used to ensure that the two fertilizers are fully blended.

[0079] According to some embodiments, before mixing, ensure that all fertilizers are in a dry state to avoid premature unwanted chemical reactions. Adjust the mixing ratio according to soil test results and crop needs to ensure balanced nutrition.

[0080] According to some embodiments, the most appropriate application method should be selected by comprehensively considering factors such as local climate conditions, soil type, irrigation facilities, and crop types. For example, for large-scale farmland or orchards, base fertilizer can be applied. After the fertilizer additive is evenly mixed with other conventional fertilizers, it is evenly spread on the field using a fertilizer spreader or manually. After fertilization, the field should be plowed in time to fully mix the fertilizer with the soil. Pay attention to wind speed and weather conditions to avoid uneven application or wind dispersion.

[0081] According to some embodiments, for situations where fixed-point fertilization is required for fruit trees, seedlings, etc., this can be done by hole application, where small pits or trenches are dug around the roots of the plants, the fertilizer additive is placed directly into the hole, and then covered with soil. The amount of fertilizer used in each hole is controlled to avoid excessive local concentration affecting the health of the root system. Watering is done in time after hole application to promote fertilizer dissolution and diffusion. Through the above-mentioned application method, the plant fertilizer additive of the present invention can be effectively applied to agricultural production, giving full play to its role in improving soil and providing nutrients, while improving fertilizer utilization efficiency and crop yield.

[0082] According to some embodiments, the design scheme of the present invention can also be applied to the design of solid mixed hydrogen fertilizer, which includes a basic fertilizer and the plant fertilizer additive as described above or a ratio scheme of the plant fertilizer additive as described above, so that the fertilizer has the advantages of low cost, safe preparation method, and good fertilizer stability while providing stable hydrogen fertilizer supplementation for plants. The basic fertilizer may include urea, superphosphate, ordinary superphosphate, calcium magnesium phosphate, potassium sulfate, potassium chloride, ammonium sulfate, ammonium nitrate, monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, potassium nitrate, ammonium nitrate, calcium nitrate, and calcium ammonium nitrate. One or more.

[0083] The content of the present invention is described below by specific embodiments:

[0084] Example 1

[0085] A solid mixed hydrogen fertilizer comprises 80w% of urea and 20w% of plant fertilizer additives, wherein the mass percentage concentration of magnesium hydride is 10wt%, the mass percentage concentration of calcium hydride is 1wt%, and the rest is diatomaceous earth.

[0086] Example 2

[0087] A solid mixed hydrogen fertilizer comprises 80w% of urea and 20w% of plant fertilizer additives, wherein the mass percentage concentration of magnesium hydride in the additives is 12wt%, the mass percentage concentration of calcium hydride is 1.5wt%, and the rest is diatomaceous earth.

[0088] Example 3

[0089] A solid mixed hydrogen fertilizer comprises 80w% of urea and 20w% of plant fertilizer additives, wherein the mass percentage concentration of magnesium hydride is 12wt%, the mass percentage concentration of calcium hydride is 2wt%, and the rest is diatomaceous earth.

[0090] Example 4

[0091] A solid mixed hydrogen fertilizer comprises 80w% of urea and 20w% of plant fertilizer additives, wherein the mass percentage concentration of magnesium hydride is 13wt%, the mass percentage concentration of calcium hydride is 2wt%, and the rest is diatomaceous earth.

[0092] Example 5

[0093] A solid mixed hydrogen fertilizer comprises 80w% of urea and 20w% of plant fertilizer additives, wherein the mass percentage concentration of magnesium hydride is 15wt%, the mass percentage concentration of calcium hydride is 2wt%, and the rest is diatomaceous earth.

[0094] Comparative Example 1

[0095] 30% of magnesium hydride and diatomaceous earth were mixed as the plant fertilizer additive for the control group. 80w% of urea and 20w% of the plant fertilizer additive for the control group were mixed and applied.

[0096] Comparative Example 2

[0097] 35% of single calcium hydride and diatomaceous earth were mixed as the plant fertilizer additive of the control group. 80w% of urea and 20w% of the plant fertilizer additive of the control group were mixed and applied.

[0098] Comparative Example 3

[0099] 20% magnesium hydride and 10% calcium hydride were mixed with diatomaceous earth as the plant fertilizer additive for the control group. 80w% urea and 20w% of the plant fertilizer additive for the control group were mixed and applied.

[0100] Comparative Example 4

[0101] 25% magnesium hydride and 10% calcium hydride were mixed with diatomaceous earth as the plant fertilizer additive for the control group. 80w% urea and 20w% of the plant fertilizer additive for the control group were mixed and applied.

[0102] Comparative Example 5

[0103] A solid mixed hydrogen fertilizer comprises 65w% of urea and 35w% of plant fertilizer additives, wherein the mass percentage concentration of magnesium hydride is 15wt%, the mass percentage concentration of calcium hydride is 2wt%, and the rest is diatomaceous earth.

[0104] 5. Comparative analysis of plant application experimental data

[0105] Plant application experiments were performed on the above-mentioned embodiments 1-5 and comparative examples 1, 2, 3, 4, and 5. Specifically, rice was used as the experimental plant in the present invention. The hydrogen fertilizers in the above-mentioned embodiments 1-5 and comparative examples 1, 2, 3, 4, and 5 were mixed into the soil and loaded into the seedling trays placed in advance in the seedling raising shed. Marks were inserted between different test proportions, and a group of control groups was retained, wherein the control group only applied the same mass of urea as basal fertilizer as a normal growth comparison. Sowing, covering, watering, and temperature and moisture management after sowing are the same as ordinary seedling raising management. Afterwards, data collection was performed at certain time intervals, and qualitative observations and trace element quantitative analysis tests were performed on the plant growth to obtain the experimental data table shown in Table 1.

[0106] Table 1 Experimental data table

[0107]

[0108]

[0109] Referring to the experimental data in Table 1, the data in the table are collected at room temperature in the greenhouse. It can be seen from the data in the table that, compared with the control group embodiments 1-5, the plants grow rapidly and the plants are in good condition. The growth state of the plants in comparative examples 1, 3, 4, and 5 is slightly better than that of the plants in the control group, but is significantly inferior to that of the plants in embodiments 1-5. The growth state of the plants in comparative examples 2, 3, and 4 is general, and the leaves are yellow, indicating that there is an imbalance in the release of fertilizers. The levels of magnesium and calcium nutrients in the plants of embodiments 1-5 are uniformly in a high proportion, while the levels of magnesium and calcium elements in the plants of comparative examples 1, 2, 3, and 4 are unstable, and the content varies.

[0110] In summary, the plant fertilizer additive in the scheme of the present invention can supplement the magnesium element while stably supplementing the hydrogen element to the plant, and can also adjust the pH value of the soil by using the magnesium hydride as the main agent.

[0111] According to some embodiments, in the solution of the present invention, by adding the calcium hydride, heat is provided for the decomposition of the magnesium hydride and the hydrogen fertilizer content is further increased.

[0112] According to some embodiments, in the scheme of the present invention, by adding the diatomaceous earth, it is possible to improve the soil structure while increasing the air permeability and drainage, helping to retain moisture and nutrients of the additive itself, and preventing diseases and insect pests.

[0113] According to some embodiments, the scheme of the present invention can provide a solid mixed hydrogen fertilizer, by mixing the basic fertilizer with the plant fertilizer additive provided in the design of the present invention in a ratio of 0-30%, so as to stably provide hydrogen fertilizer supplement for plants, which has wide applications, is easy to use, has low cost, is safe in preparation method, and has good fertilizer stability.

[0114] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A plant fertilizer additive, characterized in that: include: Magnesium hydride, calcium hydride and diatomaceous earth, wherein the magnesium hydride is a main agent, the calcium hydride is a first auxiliary agent, and the diatomaceous earth is a second auxiliary agent.

2. The plant fertilizer additive according to claim 1, characterized in that The total mass percentage concentration of hydrogen in the plant fertilizer additive is 0.1-35wt%.

3. The plant fertilizer additive according to claim 1, characterized in that The plant fertilizer additive contains magnesium in a total mass percentage concentration of 0.1 to 15 wt %.

4. The plant fertilizer additive according to claim 1, characterized in that The total mass percentage concentration of calcium in the plant fertilizer additive is 0.1-3wt%.

5. The plant fertilizer additive according to claim 1, characterized in that In the plant fertilizer additive, the concentration ratio of the magnesium hydride to the calcium hydride is 10-15:1-3.

6. The plant fertilizer additive according to claim 1, characterized in that Magnesium hydride, calcium hydride and diatomaceous earth, wherein the mass percentage concentration of the magnesium hydride is 0.1-15wt%; the mass percentage concentration of the calcium hydride is 0.1-10wt%, and the rest is diatomaceous earth.

7. A method for preparing a plant fertilizer additive as claimed in any one of claims 1 to 6, characterized in that: include: Prepare magnesium hydride and calcium hydride nanoparticles respectively, wherein the specific surface area of ​​the calcium hydride nanoparticles is greater than the specific surface area of ​​the magnesium hydride nanoparticles, so that the calcium hydride nanoparticles react with water before the magnesium hydride nanoparticles; The magnesium hydride and calcium hydride nanoparticles and diatomaceous earth are mixed according to the plant fertilizer additive ratio described in any one of claims 1 to 6 to obtain the plant fertilizer additive.

8. The preparation method according to claim 7, characterized in that: Magnesium hydride and calcium hydride nanoparticles are prepared respectively, including: Using high-purity magnesium powder as raw material, ball milling is performed in a ball milling equipment; The ball-milled magnesium powder is heated to a certain temperature in a high-pressure hydrogen environment to fully absorb hydrogen to generate magnesium hydride, thereby obtaining magnesium hydride nanoparticles.

9. A solid mixed hydrogen fertilizer, characterized in that: The solid mixed hydrogen fertilizer comprises: a basic fertilizer and the plant fertilizer additive according to any one of claims 1 to 6, wherein the basic fertilizer and the plant fertilizer additive are mixed in a ratio of 0-30%.

10. The solid mixed hydrogen fertilizer according to claim 9, characterized in that: The basic fertilizer includes one or more of urea, double superphosphate, ordinary superphosphate, calcium magnesium phosphate, potassium sulfate, potassium chloride, ammonium sulfate, ammonium nitrate phosphate, monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, potassium nitrate, ammonium nitrate phosphate, calcium nitrate, and calcium ammonium nitrate.

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