Plant fertilizer additive and solid mixed hydrogen fertilizer and preparation method thereof

Abstract

The application provides a plant fertilizer additive and a solid mixed hydrogen fertilizer and a preparation method. The plant fertilizer additive comprises magnesium hydride, calcium hydride and diatomite, wherein the magnesium hydride is a main agent, the calcium hydride is a first auxiliary agent, and the diatomite is a second auxiliary agent. According to the technical scheme, hydrogen fertilizer can be stably provided for plants, the cost is low, the preparation method is safe, and the fertilizer has good stability.

Description

TECHNICAL FIELD

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

[0002] Hydrogen is one of the essential nutrients required for plant growth. In recent years, through agricultural research, it has been found that hydrogen molecules can improve plant stress resistance, regulate plant growth and development, and have the functions of long-term preservation of vegetables, fruits and flowers. Based on the positive effects of hydrogen molecules on plants, researchers have proposed the concept of "hydrogen fertilizer", which formally regards hydrogen as a fertilizer for production and research.

[0003] With the increasing attention to environmental protection and efficient agriculture, some research has begun to explore the possibility of directly using hydrogen or hydrogen-rich compounds as new fertilizers. It is well known that the widely used plant fertilizer on the market at present is nitrogen fertilizer, including urea, ammonium nitrate and the like. In recent years, for example, certain 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 directly apply hydrogen gas 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 gas is introduced into water or nutrient solution to obtain a hydrogen-rich plant growth regulator to promote plant growth and development and morphological formation, and to enhance the metabolic capacity of plants. 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 electrolytic water preparation of hydrogen-rich water, and can be applied on a large scale. However, due to the high requirements of the prior art for the transportation, use and storage of gaseous hydrogen which has the risk of being flammable and explosive, and the low solubility of hydrogen in water and the fast escape speed of hydrogen in water, it is difficult to store stably, and a large amount of hydrogen is wasted in the preparation process of hydrogen water. Therefore, the existing patent technology has certain limitations and cannot be widely promoted.

[0004] Therefore, a technical solution is needed to stably provide hydrogen fertilizer for plants while being low in cost, safe in preparation method and good in fertilizer stability. SUMMARY

[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 for plants while being low in cost, safe in preparation method and good in fertilizer stability.

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

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

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

[0009] According to some embodiments, the total mass percentage concentration of calcium in the plant fertilizer additive is 0.1–3 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 are used, wherein the mass percentage concentration of magnesium hydride is 0.1-15 wt%; the mass percentage concentration of calcium hydride is 0.1-3 wt%; and the remainder is diatomaceous earth.

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

[0013] Magnesium hydride and calcium hydride nanoparticles were prepared separately, wherein the specific surface area of ​​the calcium hydride nanoparticles was greater than that of the magnesium hydride nanoparticles, so that the calcium hydride nanoparticles reacted with water before the magnesium hydride nanoparticles.

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

[0015] According to some embodiments, magnesium hydride and calcium hydride nanoparticles were prepared, including:

[0016] High-purity magnesium powder is used as raw material and ball milling is carried out in a ball milling equipment;

[0017] The ball-milled magnesium powder is heated to a certain temperature under high-pressure hydrogen atmosphere to fully absorb hydrogen and generate magnesium hydride, thus obtaining magnesium hydride nanoparticles.

[0018] According to one aspect of this application, a method for applying a plant fertilizer additive as described in any of the preceding claims is provided, wherein the prepared plant fertilizer additive is mixed with other fertilizers used in conventional planting processes, and the plant fertilizer additive is applied by directly mixing it with other fertilizers and spreading or applying it in holes.

[0019] According to one aspect of this application, a solid mixed hydrogen fertilizer is provided, the hydrogen fertilizer comprising a base fertilizer and a plant fertilizer additive as described in any of the preceding claims, wherein the base fertilizer and the plant fertilizer additive are mixed in a ratio of 0-30%.

[0020] According to some embodiments, the base fertilizer comprises one or more of urea, triple superphosphate, ordinary superphosphate, calcium magnesium phosphate, potassium sulfate, potassium chloride, ammonium sulfate, ammonium phosphate nitrate, monoammonium phosphate, diammonium phosphate, potassium phosphate dibasic, potassium nitrate, ammonium phosphate nitrate, calcium nitrate, calcium ammonium nitrate.

[0021] According to the embodiments of the present application, by applying the magnesium hydride as the main agent, hydrogen elements and magnesium elements can be supplemented to plants stably, and the soil pH value can be adjusted; by adding the calcium hydride, heat is provided for the decomposition of the magnesium hydride, and the hydrogen fertilizer content is further improved; by adding the diatomite, the soil structure can be improved, the air permeability and the water permeability can be increased, the water and the nutrients of the additive itself can be maintained, and the disease and pest can be prevented.

[0022] According to some embodiments, the design of the present application also provides a solid mixed hydrogen fertilizer, by mixing the base fertilizer and the plant fertilizer additive at a ratio of 0-30%, so that hydrogen fertilizer is supplemented to plants stably, the use is wide, the use is convenient, the cost is low, the preparation method is safe, and the fertilizer stability is good.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows.

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

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] It should be particularly pointed out that similar substitutions and changes made for the present application are obvious to those skilled in the art, and they are all considered to be included in the present application. Relevant personnel can obviously make changes or appropriate changes and combinations to the methods and applications described herein without departing from the content, spirit and scope of the present application, to realize and apply the present application technology. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0028] Unless otherwise specified, the present application is carried out according to the conventional conditions or the conditions recommended by the manufacturer, the raw materials or excipients used, and the reagents or instruments used are not specified by the manufacturer, and are conventional products that can be obtained by purchase.

[0029] According to the technical concept of the present application, a plant fertilizer additive and hydrogen fertilizer and a preparation and application method are provided, which can stably provide hydrogen fertilizer for plants, while being low in cost, safe in preparation method, and good in fertilizer stability. According to the embodiments, by applying the magnesium hydride as the main agent, the magnesium element and the hydrogen element can be supplemented for plants stably, and the soil pH value can be adjusted; by adding the calcium hydride, heat is provided for the decomposition of the magnesium hydride, and the hydrogen fertilizer content is further improved; by adding the diatomite, the soil structure can be improved while the air permeability and the drainage are increased, the water and the nutrients of the additive itself are helped to be maintained, and the disease and pest can be prevented.

[0030] The example embodiments of the present application are described below with reference to the accompanying drawings.

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

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

[0033] According to some embodiments, the plant fertilizer additive applies calcium hydride (CaH2) as the first auxiliary agent, which provides hydrogen fertilizer for plants while supplementing calcium elements. At the same time, it is a strong reducing agent, which 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 is helpful to improve the acidic soil conditions.

[0034] According to some embodiments, the plant fertilizer additive applies diatomite as the second auxiliary agent, which can be used to adjust the proportion of other components in addition to the physical properties such as increasing the soil air permeability and drainage, to ensure the stability and applicability of the product.

[0035] According to some embodiments, the plant fertilizer additive has a total mass percentage of hydrogen in the range of 0.1-35 wt%. The plant fertilizer additive has a hydrogen content of 0.1% to 35%. This high content of hydrogen is mainly derived from magnesium hydride (MgH2) and calcium hydride (CaH2) as these are the main components of the fertilizer additive. When these hydrides come into contact with moisture in the soil, they decompose to produce hydrogen gas and alkaline byproducts such as magnesium oxide and calcium oxide, which can help to improve the pH of acidic soils, thus benefiting plant growth. The hydrogen gas released upon reaction with water is partially dissolved in the soil solution to improve soil conditions (e.g. pH adjustment), and the other part is used as part of the gaseous fertilization in controlled environments. If applied in a controlled environment, such as a greenhouse, the released hydrogen gas can be further converted into a form usable 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 to promote seed germination or increase soil temperature.

[0036] According to some embodiments, the plant fertilizer additive has a total mass percentage of magnesium in the range of 0.1-15 wt%. The plant fertilizer additive has a magnesium content of 0.1% to 15%. This magnesium content is mainly derived from magnesium hydride (MgH2) as it is one of the main components of the fertilizer additive. Magnesium is one of the essential nutrients for plant growth and plays a crucial role in plant physiological functions. It is one of the core components of chlorophyll and is essential for photosynthesis. A lack of magnesium can cause leaf yellowing and affect plant energy production. Magnesium is involved in the activation of various enzyme systems that play important roles in carbohydrate metabolism, nucleic acid synthesis, and protein synthesis. Magnesium helps maintain ion balance within cells and promotes the absorption and transport of other mineral nutrients such as phosphorus and calcium. A magnesium content of 0.1-15 wt% can effectively supplement any potential magnesium deficiency in the soil, especially in areas where the soil has been cultivated for a long time or where the soil itself has a low magnesium content. When magnesium hydride reacts with water, it not only releases hydrogen gas but also produces magnesium oxide (MgO), which can help to improve the pH of acidic soils, making the soil environment more suitable for plant growth.

[0037] According to some embodiments, the total mass percentage of calcium in the plant fertilizer additive is 0.1-3wt%. The calcium element accounts for 0.1% to 3% of the plant fertilizer additive, and the calcium content mainly comes from calcium hydride (CaH2). Calcium is an important component of cell walls, which helps to maintain the strength and stability of cell walls, thereby enhancing the overall structure and lodging resistance of plants. Calcium is involved in intracellular signal transduction processes and regulates various physiological responses, such as stomatal opening and closing, ion transport, etc. As an activator or cofactor for many enzymes, calcium is involved in multiple metabolic pathways, including photosynthesis, respiration, and protein synthesis, etc. Calcium is very important for the normal development of root meristem, can promote the healthy growth of root system, and improve the plant's ability to absorb water and other nutrients. Adequate calcium supply can improve fruit firmness, extend storage period, and reduce the occurrence of some physiological diseases, such as bitter canker of apples and gummy stem blight of tomatoes. The 0.1-3wt% calcium content in the plant fertilizer additive can effectively supplement the possible calcium deficiency in the soil, especially in those places where long-term cultivation or the soil itself has low calcium content.

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

[0039] According to some embodiments, the concentration ratio of magnesium hydride to calcium hydride in the plant fertilizer additive is 10-15:1-3. The concentration ratio of magnesium hydride (MgH2) to calcium hydride (CaH2) in the plant fertilizer additive is 10-15:1-3. Magnesium hydride plays a dominant role in the formula as the main agent, while calcium hydride is added in a smaller proportion as an auxiliary agent. Plants have a relatively large demand for magnesium, especially in the process of photosynthesis, which requires sufficient magnesium to synthesize chlorophyll. Therefore, a higher proportion of magnesium hydride can ensure the provision of sufficient magnesium elements to support the healthy growth of plants. Although calcium is also an essential nutrient element for plants, its demand is usually lower than that of magnesium. An appropriate amount of calcium helps to maintain cell wall structure, promote root development, etc. By maintaining a lower proportion of calcium hydride, the calcium demand of plants can be met while avoiding the problem of excess. Both magnesium hydride and calcium hydride are easy to react with water, generating hydrogen gas and magnesium oxide or calcium oxide, respectively. A higher proportion of magnesium hydride may mean more hydrogen gas release, which can be utilized for gas fertilization or other purposes in some controlled environments (such as greenhouses); while a lower proportion of calcium hydride can control the amount of alkaline by-products generated, thereby better managing changes in soil pH.

[0040] According to some embodiments, the magnesium hydride and calcium hydride are mixed in a ratio of 10-15:1-3, which optimizes the role of these two components in the plant fertilizer additive, not only effectively providing the magnesium and calcium elements required by plants, but also improving the crop growth environment by adjusting the soil pH value and possibly the effect of gas fertilization.

[0041] According to some embodiments, the magnesium hydride, the calcium hydride, and the diatomite, 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 diatomite. Although an appropriate amount of magnesium and calcium helps to improve the soil structure, an excessive amount may change the physical properties of the soil, affecting 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 due to excessive magnesium and calcium. The diatomite serves as a filler and carrier in the plant fertilizer additive, increasing the air permeability and drainage capacity of the soil, while helping to retain water and nutrients. Diatomite can also be used as a mechanical insecticide to destroy the exoskeleton of insects. Since both magnesium hydride and calcium hydride are active metal hydrides, they can react violently with water under humid conditions. Therefore, the presence of diatomite not only acts as a filler, but also plays a dilution 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 diatomite to optimize the supply of magnesium and calcium required by plants, while improving soil conditions and considering the safety and stability of the product in actual application.

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

[0043] Referring to Figure 1 , a flow chart of a method for preparing a plant fertilizer additive according to an example embodiment is shown, and the purpose of the present application is also to provide a method for preparing a plant fertilizer additive as claimed in any one of the above, comprising:

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

[0045] According to some embodiments, the 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 has 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 its reaction rate with water. By increasing the specific surface area of the calcium hydride nanoparticles, it can react faster when exposed to moisture, releasing hydrogen gas and generating calcium oxide (CaO), which in turn rapidly changes the pH value of the local environment. The magnesium hydride nanoparticles, due to their small specific surface area, react with water at a slower rate, so they can gradually take effect after the calcium hydride reaction, avoiding the release of too much hydrogen or alkaline substances at once.

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

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

[0048] According to some embodiments, sampling analysis is performed during the entire mixing process to ensure that the proportion of each component meets 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 treatment to remove possible trace amounts of moisture, further improving the stability of the product.

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

[0050] According to some embodiments, the plant fertilizer additive prepared by this method not only provides an appropriate amount of magnesium and calcium elements to support plant growth, but also improves soil conditions by adjusting the pH value of the soil. In addition, by controlling the reaction sequence of the two hydrides, their activity in the soil can be better managed, 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 plant fertilizer additives. This innovative method not only improves the efficiency of fertilizers, 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 raw material, ball milling in a ball milling device; the ball-milled magnesium powder is heated to a certain temperature under high-pressure hydrogen environment to fully absorb hydrogen to form magnesium hydride, obtaining magnesium hydride nanoparticles.

[0053] 1. Raw material preparation

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

[0055] 2. Ball milling

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

[0057] Ball milling parameter settings:

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

[0059] Speed: set an appropriate speed, generally between 300 to 600 rpm, depending on the type of ball mill used.

[0060] Time: the ball milling time varies from several hours to several tens of hours, and the specific time needs to be optimized according to experimental results.

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

[0062] After ball milling, the particle size of the magnesium powder is significantly reduced to form nanoscale particles, and its reactivity is increased.

[0063] 3. Hydrogenation treatment

[0064] Hydrogenation device: a specially designed high-pressure hydrogenation furnace or reaction kettle is used, which should have good sealing performance and be able to withstand high pressure and temperature.

[0065] Hydrogenation conditions:

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

[0067] Pressure: Apply appropriate pressure (usually 5-10 MPa) to facilitate the full hydrogen absorption of magnesium powder.

[0068] Temperature: Heat to a certain temperature (e.g. 300-400℃) to ensure that the magnesium powder is in full contact with hydrogen and undergoes hydrogenation reaction.

[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 reduce the temperature and release the hydrogen pressure to ensure safe operation.

[0071] 4. Post-cooling treatment

[0072] Collection: After the reactor cools to room temperature, carefully open the collection of magnesium hydride nanoparticles.

[0073] Storage: Since magnesium hydride is very active, it must be stored in a dry, sealed container, away from air and moisture, to prevent premature reaction.

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

[0075] Similarly, for the preparation of calcium hydride nanoparticles, the same method as above can be used, using high-purity calcium powder as the starting material. Calcium powder has lower hardness, and ball milling parameters may need to be adjusted, such as reducing the ball-to-material ratio or reducing the rotation speed, to avoid excessive pulverization leading to too fine particles. The hydrogenation temperature and pressure of calcium may be different, usually slightly lower than that of magnesium, and the specific conditions need to be adjusted according to the actual situation.

[0076] Through this method, the preparation process of the two kinds of nanoparticles can be ensured to be safe and effective, laying the foundation for subsequent mixing to make plant fertilizer additives.

[0077] The present application also provides a method for applying the plant fertilizer additive as described in any one of the above, which mixes the prepared plant fertilizer additive with other fertilizers used in conventional planting process. The plant fertilizer additive is applied by mixing directly with other fertilizers or by hole application.

[0078] According to some embodiments, the plant fertilizer additive can be flexibly mixed with other fertilizers used in conventional planting process, and can be applied in various ways. The prepared plant fertilizer additive is mixed with conventional fertilizers such as nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, etc. in appropriate proportion, and a mechanical stirrer or other mixing equipment can be used to ensure that the two fertilizers are fully integrated.

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

[0080] According to some embodiments, the selection of the most appropriate application method should take into account local climatic conditions, soil types, irrigation facilities, and crop types, etc. For example: for large area farmland or orchard, base fertilizer application can be used, the fertilizer additive is mixed evenly with other conventional fertilizers, and then spread evenly on the field using a fertilizer spreader or manual method. After fertilization, ploughing should be done in time to mix the fertilizer with the soil. Pay attention to wind speed and weather conditions to avoid uneven spreading or being blown away by the wind.

[0081] According to some embodiments, for the case of fixed-point fertilization of fruit trees, seedlings, etc., hole fertilization can be used, small holes or trenches are dug around the roots of the plants, and the fertilizer additive is directly placed in the hole, then covered with soil. Control the amount of fertilizer in each hole to avoid excessive local concentration affecting root health. Water in time after hole fertilization to promote fertilizer dissolution and diffusion. Through the above application methods, the plant fertilizer additive of the present application can be effectively applied to agricultural production, fully playing its role in improving soil and providing nutrients, while improving the utilization efficiency of fertilizers and crop yield.

[0082] According to some embodiments, the design scheme of the present application can also be applied to the design of solid mixed hydrogen fertilizer, which includes base fertilizer and plant fertilizer additive as described above or the ratio scheme of plant fertilizer additive as described above, so that the fertilizer has the advantages of stable hydrogen fertilizer supplement for plants, low cost, safe preparation method, and good fertilizer stability. The base fertilizer can include one or more of urea, heavy superphosphate, common superphosphate, calcium-magnesium phosphate, potassium sulfate, potassium chloride, ammonium sulfate, ammonium phosphate nitrate, monoammonium phosphate, diammonium phosphate, potassium phosphate, potassium nitrate, ammonium phosphate nitrate, calcium nitrate, and ammonium calcium nitrate.

[0083] The content of the present application is illustrated by specific examples as follows:

[0084] Example 1

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

[0086] Example 2

[0087] A solid mixed hydrogen fertilizer, comprising 80w% urea and 20w% plant fertilizer additive, wherein the mass percentage concentration of magnesium hydride is 12wt%, the mass percentage concentration of calcium hydride is 1.5wt%, and the rest is diatomite.

[0088] Example 3

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

[0090] Example 4

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

[0092] Example 5

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

[0094] Comparative Example 1

[0095] A single magnesium hydride of 30% is mixed with diatomite as a plant fertilizer additive of a comparative group. An 80w% urea and 20w% plant fertilizer additive of the comparative group are mixed and applied.

[0096] Comparative Example 2

[0097] A single calcium hydride of 35% is mixed with diatomite as a plant fertilizer additive of a comparative group. An 80w% urea and 20w% plant fertilizer additive of the comparative group are mixed and applied.

[0098] Comparative Example 3

[0099] A single magnesium hydride of 20% and a single calcium hydride of 10% are mixed with diatomite as a plant fertilizer additive of a comparative group. An 80w% urea and 20w% plant fertilizer additive of the comparative group are mixed and applied.

[0100] Comparative Example 4

[0101] A single magnesium hydride of 25% and a single calcium hydride of 10% are mixed with diatomite as a plant fertilizer additive of a comparative group. An 80w% urea and 20w% plant fertilizer additive of the comparative group are mixed and applied.

[0102] Comparative Example 5

[0103] A solid-state mixed hydrogen fertilizer, comprising 65w% of urea and 35w% of a plant fertilizer additive, wherein the mass percentage concentration of magnesium hydride is 15wt%, the mass percentage concentration of calcium hydride is 2wt%, and the rest is diatomite.

[0104] 5. Comparison and analysis of plant application experimental data

[0105] Plant application experiments are carried out on the above-mentioned examples 1-5 and comparative examples 1, 2, 3, 4, 5. Specifically, in the present application, rice is used as the experimental plant, and the hydrogen fertilizer in examples 1-5 and comparative examples 1, 2, 3, 4, 5 is mixed into the soil and placed in the seedling raising shed in advance. Different test ratios are inserted into the markers, and a control group is reserved, wherein the control group only applies the same amount of urea as base fertilizer for comparison. Sowing, soil covering, watering, and temperature and moisture management after sowing are the same as ordinary seedling raising management. Then, data collection is carried out at certain time intervals, and qualitative observation and quantitative analysis of trace elements are carried out on the plant growth, and the experimental data table of table 1 is obtained.

[0106] Table 1 Experimental data table

[0107]

[0108]

[0109] Referring to the experimental data in table 1, the data in the table is collected at the indoor temperature of the shed. As can be seen from the data in the table, among examples 1-5, the plants grow rapidly and the plant state is good. The plant growth state in comparative examples 1, 3, 4, 5 is slightly better than that of the control group, but is obviously inferior to the plant growth state in examples 1-5. The plant growth state of comparative examples 2, 3, 4 is general, and the leaf surface is yellow, indicating that there is an uneven release of fertilizer. The magnesium and calcium nutrient elements in examples 1-5 are evenly at a high proportion, while the magnesium and calcium elements in comparative examples 1, 2, 3, 4 are unstable and have different contents.

[0110] In summary, in the present application, the plant fertilizer additive can supplement hydrogen and magnesium elements for plants and adjust the pH value of the soil by using magnesium hydride as the main agent.

[0111] According to some embodiments, in the present application, the addition of calcium hydride provides heat for the decomposition of magnesium hydride and further increases the hydrogen fertilizer content.

[0112] According to some embodiments, in the present application, the diatomite can improve the soil structure, increase the air permeability and drainage, help to keep the moisture and the nutrients of the additive itself, and prevent the diseases and pests.

[0113] According to some embodiments, the present application can provide a solid mixed hydrogen fertilizer, which is prepared by mixing the base fertilizer with the plant fertilizer additive provided in the present application at a ratio of 0-30%, thereby stably providing hydrogen fertilizer for plants, and has wide application, is convenient to use, low in cost, safe in preparation method, and good in fertilizer stability.

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

Claims

1. A plant fertilizer additive, characterized in that, include: Magnesium hydride, calcium hydride, and diatomaceous earth, among which, The magnesium hydride is the main agent, and the mass percentage concentration of the magnesium hydride is 0.1~15wt%. The calcium hydride is the first excipient, and the mass percentage concentration of the calcium hydride is 0.1~3 wt%. The diatomaceous earth is the second auxiliary agent; In the plant fertilizer additive, the concentration ratio of magnesium hydride and calcium hydride is 10~15:1~3, the magnesium hydride and calcium hydride are nanoparticles, and the specific surface area of ​​the calcium hydride nanoparticles is greater than that of the magnesium hydride nanoparticles.

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 total mass percentage concentration of magnesium in the plant fertilizer additive is 0.1~15wt%.

4. The plant fertilizer additive according to claim 1, characterized in that, The plant fertilizer additive contains a total calcium content of 0.1-3 wt%.

5. The plant fertilizer additive according to claim 1, characterized in that, The magnesium hydride has a mass percentage concentration of 0.1-15 wt%; the calcium hydride has a mass percentage concentration of 0.1-3 wt%, and the remainder is diatomaceous earth.

6. A method for preparing a plant fertilizer additive as described in any one of claims 1-5, characterized in that, include: Magnesium hydride and calcium hydride nanoparticles were prepared separately, wherein the specific surface area of ​​the calcium hydride nanoparticles was greater than that of the magnesium hydride nanoparticles, so that the calcium hydride nanoparticles reacted with water before the magnesium hydride nanoparticles. The magnesium hydride, calcium hydride nanoparticles, and diatomaceous earth are mixed according to the plant fertilizer additive ratio described in any one of claims 1-5 to obtain the plant fertilizer additive.

7. The preparation method according to claim 6, characterized in that, Magnesium hydride and calcium hydride nanoparticles were prepared separately, including: High-purity magnesium powder is used as raw material and ball milling is carried out in a ball milling equipment; The ball-milled magnesium powder is heated to a certain temperature under high-pressure hydrogen atmosphere to fully absorb hydrogen and generate magnesium hydride, thus obtaining magnesium hydride nanoparticles.

8. A solid mixed hydrogen fertilizer, characterized in that, The solid mixed hydrogen fertilizer comprises: a base fertilizer and a plant fertilizer additive as described in any one of claims 1-5, wherein the base fertilizer and the plant fertilizer additive are mixed at a mass ratio of 20-30%.

9. The solid mixed hydrogen fertilizer according to claim 8, characterized in that, The basic fertilizers include one or more of the following: urea, superphosphate, ordinary superphosphate, calcium magnesium phosphate, potassium sulfate, potassium chloride, ammonium sulfate, ammonium nitrate, monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, potassium nitrate, calcium nitrate, and calcium ammonium nitrate.

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