A soil conditioner for improving salinization and its preparation method and application

Abstract

The present invention relates to the technical field of soil improvement, and specifically provides a soil improver for improving salinization, a preparation method thereof, and an application thereof, which comprises, by weight, 10-30 parts of nanoparticles, 5-25 parts of composite organic acids, 10-20 parts of biochar, 5-15 parts of mineral particles, and 1-4 parts of plant growth regulators. The soil improver for improving salinization described in the present invention comprises nanoparticles, composite organic acids, biochar, mineral particles, and plant growth regulators, and the salinization problem of the soil is improved together through the synergistic effect between the components, thereby promoting the growth of plants.

Description

Technical Field

[0001] The present invention relates to the field of soil improvement, and in particular to a soil conditioner for improving salinization and a preparation method and application thereof. Background Art

[0002] Soil salinization refers to the process in which the salt in the bottom soil or groundwater rises to the surface with capillary water, and after the water evaporates, the salt accumulates in the surface soil. It is also called salinization. Soil salinization can cause excessive salt concentration in the soil solution, affecting the root water absorption of crops, and even causing water backflow, leading to acute wilting of crops. In the long run, the growth of crops is seriously hindered, and the yield and quality are greatly reduced. Therefore, when soil salinization occurs, it is usually necessary to improve the soil so that the soil can continue to be cultivated.

[0003] At present, the commonly used improvement methods are chemical improvement and biological improvement. Chemical improvement measures are methods of improving saline soil by applying chemical improvers and mineral fertilizers. Among them, the most widely used soil improver is gypsum. Although the long-term and large-scale application of gypsum has improved the salinization problem of the soil, it has obvious limitations. It is only effective when the sodium salt content in the soil is high, and it takes a long time to improve the salinization problem of the soil; while biological improvement mainly uses plant extraction and enrichment. Although the improvement effect is better, the time period required for biological improvement is long and it is difficult to promote and apply. Therefore, it is urgent to provide a soil improver with better treatment effect for improving salinization. Summary of the invention

[0004] The present invention aims to solve at least one of the above technical problems.

[0005] To achieve the first object of the present invention, the present invention provides a soil conditioner for improving salinization, which comprises, by weight: 10-30 parts of nanoparticles, 5-25 parts of composite organic acids, 10-20 parts of biochar, 5-15 parts of mineral particles, and 1-4 parts of plant growth regulators; wherein the preparation method of the soil conditioner for improving salinization comprises: S100, mixing the nanoparticles and the mineral particles, and performing ultrasonic dispersion treatment to obtain mixed particles; S200, adding biochar and composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding a plant growth regulator into deionized water to prepare a plant growth regulator solution, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment to obtain a soil conditioner for improving salinization; The nanoparticles include a mixture of nano calcium sulfate particles and nano zeolite particles; the composite organic acid includes a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid.

[0006] In any of the above technical solutions, in the nanoparticles, the mass ratio of nano calcium sulfate particles to nano zeolite particles is (1-1.5):1; and / or in the composite organic acid, the mass ratio of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid is 1:(0.3-0.6):(0.3-0.5):(0.2-0.3):(0.2-0.3).

[0007] In any of the above technical solutions, the biochar includes at least one of rice husk fermentation products, fruit shell fermentation products, straw fermentation products and wood fermentation products; and / or the mineral particles include at least one of calcium carbonate particles, gypsum particles, dolomite particles and pyroxene particles; and / or the plant growth regulator includes at least one of a plant hormone regulator and a proline regulator.

[0008] To achieve the second object of the present invention, the present invention provides a method for preparing a soil conditioner for improving salinization, which is used to prepare the soil conditioner for improving salinization according to any one of the above technical solutions, and the preparation method comprises: S100, mixing the nanoparticles and the mineral particles, and performing ultrasonic dispersion treatment to obtain mixed particles; S200, adding biochar and composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding a plant growth regulator into deionized water to prepare a plant growth regulator solution, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment to obtain a soil conditioner for improving salinization; The nanoparticles include a mixture of nano calcium sulfate particles and nano zeolite particles; the composite organic acid includes a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid. In any of the above technical solutions, the method for preparing nanoparticles comprises: S110, ball-milling the calcium sulfate to obtain nano calcium sulfate particles; S120, dissolving the silicon source and the aluminum source in ethanol, adjusting the pH, adding a surfactant and a template agent, standing for 14-24 hours, and then sequentially drying and calcining to obtain nano zeolite particles; S130, mixing the nano calcium sulfate particles and the nano zeolite particles uniformly to obtain nano particles.

[0009] In any of the above technical solutions, in S120, the silicon source includes any one of tetraethoxysilane, silicon dioxide or sodium silicate; and / or the aluminum source includes any one of aluminum nitrate, aluminum hydroxide or sodium aluminate; and / or the surfactant includes any one of sodium dodecylbenzenesulfonate, ammonium chloride, cetylpyridinium chloride or polyvinyl alcohol; and / or the template includes any one of benzyl alcohol, tetraethylammonium chloride, tetramethylammonium chloride or dimethylethanolamine.

[0010] In any of the above technical solutions, in S110, the ball milling medium for ball milling treatment is alumina balls, and the diameter of the alumina balls is 2-6 mm; and / or in S120, the pH is adjusted to 7-9; and / or in S120, the calcination temperature is 300-600°C; and / or in S120, the calcination time is 2-5h; and / or in S120, the drying temperature is 100-150°C; and / or in S120, the drying time is 1-3h.

[0011] In any of the above technical solutions, in S100, the frequency of the ultrasonic dispersion treatment is 30-40 kHz; and / or the time of the ultrasonic dispersion treatment is 10-25 min.

[0012] In any of the above technical solutions, in S300, the concentration of the plant growth regulator solution is 2-10 mg / L; and / or in S400, in the carrier material solution, the carrier material includes sodium alginate or gelatin; and / or in S400, the mass ratio of the carrier material solution to the second mixed solution is (1-4):1.

[0013] To achieve the third purpose of the present invention, the present invention also provides an application of a soil conditioner for improving salinization, wherein the soil conditioner for improving salinization is used to improve soil salinization.

[0014] After adopting the technical solution of the present invention, the technical effects that can be achieved are as follows: 1. The soil conditioner for improving salinization described in the present invention includes nanoparticles, composite organic acids, biochar, mineral particles and plant growth regulators, which improve the salinization problem of soil through the synergistic effect between the components, thereby promoting plant growth; 2. By rationally selecting the types of nanoparticles and composite organic acids and adjusting their ratios, soil salinization can be effectively alleviated, and trace elements and other substances necessary for plant growth can be provided, thereby increasing soil fertility and promoting healthy plant growth; 3. When preparing the soil conditioner for improving salinization described in the present invention, the soil conditioner for improving salinization is made into microcapsules, which can control the slow release of the active ingredients in the soil conditioner, so that the soil conditioner can act in the soil for a long time and achieve better results. DETAILED DESCRIPTION

[0015] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0016] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0017] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below.

[0018] In the related art, when soil salinization occurs, chemical improvement or biological improvement methods are usually used to improve the soil. The most widely used soil conditioner in chemical improvement is gypsum. Although the long-term and large-scale application of gypsum has improved the problem of soil salinization, it has obvious limitations. It is only effective when the sodium salt content in the soil is high, and it takes a long time to improve the problem of soil salinization. In addition, the long-term and large-scale application of gypsum may lead to excessive calcium in the soil, inhibit the absorption of elements such as magnesium and potassium, and cause plant nutritional imbalance. Biological improvement mainly uses plant extraction and enrichment. Although the improvement effect is better, the time period required for biological improvement is long and it is difficult to promote and apply.

[0019] In view of this, an embodiment of the present invention provides a soil conditioner for improving salinization, and a preparation method and application thereof. By using the ingredients of the soil conditioner for improving salinization and selecting a suitable preparation method according to the ingredients, a soil conditioner for improving salinization with better treatment effect is obtained.

[0020] Specifically, an embodiment of the present invention provides a soil conditioner for improving salinization, which includes, by mass: 10-30 parts of nanoparticles, 5-25 parts of complex organic acids, 10-20 parts of biochar, 5-15 parts of mineral particles, and 1-4 parts of plant growth regulators.

[0021] Preferably, the soil conditioner for improving salinization described in the present invention includes nanoparticles, composite organic acids, biochar, mineral particles and plant growth regulators, which jointly improve the salinization problem of the soil through the synergistic effect of the components, thereby promoting plant growth; wherein the nanoparticles can reduce the salt in the soil by combining with salt ions in the soil to form a complex, thereby reducing the damage of salt to plant roots, and the nanoparticles can also effectively improve the soil structure, making the soil more loose, which is conducive to the circulation of water and air, and further promotes plant growth.

[0022] Furthermore, the nanoparticles include a mixture of nano calcium sulfate particles and nano zeolite particles. Calcium sulfate reduces the sodium concentration in the soil by exchanging with sodium ions, improves soil water retention and permeability as well as aggregate structure, thereby reducing the inhibitory effect of salt on plant roots and enhancing soil drainage and air permeability. Nano calcium sulfate has a higher specific surface area, which is conducive to faster and more extensive reaction with salt ions in the soil. Zeolite is a mineral material with strong adsorption capacity, which can absorb salt in the soil and release the adsorbed salt when the water content changes, thereby achieving the effect of long-term relief of salinization. In addition, zeolite can provide plants with minerals and trace elements, increase soil fertility, and promote healthy plant growth.

[0023] Furthermore, in the nanoparticles, the mass ratio of nano calcium sulfate particles to nano zeolite particles is (1-1.5):1. The amount of added nano calcium sulfate particles can ensure effective reduction of salt accumulation in the soil, and the nano zeolite particles can further alleviate soil salinization, stabilize the ion balance in the soil, and promote plant growth.

[0024] Preferably, the composite organic acid converts the salt in the soil into trace elements that can be absorbed by plants or into a form that will not harm the soil through chelation, thereby improving soil salinization. In addition, the acidic properties of the composite organic acid can also promote the release of nutrients such as calcium, magnesium, potassium, etc. in the soil, helping to improve soil fertility.

[0025] Furthermore, the composite organic acid includes a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid. Citric acid has a strong acidity and can significantly reduce soil pH, promote salt dissolution, increase the exchange of sodium, calcium, magnesium and other ions in the soil, and can help remove sodium salts in the soil, which is suitable for quick soil improvement; malic acid has a moderate acidity and can promote the dissolution of minerals and salts in the soil, adjust soil pH, and has a mild stimulation to plants; acetic acid is a common weak acid, which has a relatively rapid acidification effect, can significantly reduce soil pH, and enhance the solubility of certain nutrients such as iron and manganese, and is particularly suitable for alleviating salinity in acidic soils Problem: Oxalic acid is an organic diacid with strong chelating ability. It can form soluble complexes with metal ions such as calcium and iron, thereby increasing the effectiveness of these elements in the soil and promoting the release of minerals such as calcium and iron and their absorption by plants. Fumaric acid is weaker in acidity and has better chelating effect. It can promote the dissolution of minerals such as calcium, iron and magnesium and adjust the content of trace elements in the soil. By compounding these organic acids into composite organic acids, their acidity and chelating ability are suitable, and they can react with salts in the soil such as sodium, calcium and magnesium, thereby reducing the impact of salt on the soil and improving the acidity and alkalinity of the soil and the availability of nutrients.

[0026] Furthermore, in the composite organic acid, the mass ratio of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid is 1: (0.3-0.6): (0.3-0.5): (0.2-0.3): (0.2-0.3). The proportions of various organic acids are appropriate, which can achieve efficient improvement of salinized soil, so that the prepared soil conditioner can improve soil salinity and promote the growth of plant roots.

[0027] Preferably, biochar is produced by high-temperature anaerobic carbonization of organic matter such as crop residues, and can reduce salt and heavy metal ions in the soil by physical adsorption or chemical adsorption, thereby improving the problem of soil salinization. In addition, biochar can provide a rich pore structure, promote the circulation of water and air in the soil, and provide space for the growth and reproduction of microorganisms, which is beneficial to maintaining soil moisture and air as well as microbial communities, and is conducive to plant growth.

[0028] Furthermore, the biochar includes at least one of rice husk fermentation, fruit husk fermentation, straw fermentation and wood fermentation. Rice husk is rich in minerals such as silicon, potassium, calcium, etc., fruit husk contains high cellulose and natural antioxidants, straw is rich in carbon and nitrogen, and can provide absorbable nitrogen source for the soil, and wood contains high lignin and cellulose. Through fermentation treatment, the organic matter in these raw materials is decomposed into a form that is more easily utilized by microorganisms, which provides more food sources for microorganisms in the soil. The pores and surfactant contained in the biochar formed after fermentation of the above raw materials can improve the water absorption and moisture retention capacity of the biochar, and provide shelter and living space for microorganisms, thereby improving the aeration of the soil, avoiding excessive drying or waterlogging of the soil, and also increasing the population and activity of soil microorganisms, which is beneficial to plant growth.

[0029] Preferably, the mineral particles can provide rich mineral elements, which can effectively regulate the salt concentration in the soil, especially the concentration of sodium ions, through adsorption, thereby effectively improving the problem of soil salinization. In addition, the mineral particles have a unique structure that can increase the porosity of the soil, which can further promote the transmission of nutrients, thereby promoting plant growth.

[0030] Furthermore, the mineral particles include at least one of calcium carbonate particles, gypsum particles, dolomite particles and pyroxene particles. Calcium carbonate is the most common calcium-containing mineral and is widely used to adjust the pH of the soil, alleviate acidic soil, increase the alkalinity of the soil, and provide calcium to plants, promote plant growth, and improve root development; gypsum is a calcium sulfate hydrate that can improve saline-alkali soil, especially soil with excessive sodium salts. It can replace sodium ions with calcium ions through an exchange reaction, reduce soil salinization, and provide sulfur and calcium to plants to promote the development of plant roots; dolomite is a calcium- and Magnesium carbonate minerals can be used to supplement calcium and magnesium in the soil and improve the physical properties of the soil. In particular, for soils lacking magnesium, they can promote crop growth and improve soil structure and fertility by providing calcium and magnesium elements. Pyroxene is a common magnesium silicate mineral that is widely present in the earth's crust. The magnesium in pyroxene is an essential nutrient for plants and can help plants synthesize chlorophyll and promote plant growth. The use of mineral particles of any of the above types or their combinations can provide better performance for the prepared soil conditioner, thereby effectively improving the problem of soil salinization and being beneficial to plant growth.

[0031] Preferably, the plant growth regulator can stimulate the growth of plant roots and promote the absorption of nutrients and salt by plants, thereby helping plants overcome the difficulties caused by soil salinization, reducing the damage caused by salt to plants, and improving the growth ability of plants in a salinized environment.

[0032] Furthermore, the plant growth regulator includes at least one of a plant hormone regulator and a proline regulator. Plant hormones are chemical substances naturally produced in plants and are usually the active ingredients of plant growth regulators. They can simulate or enhance the effects of plant hormones. Adding a small amount of plant hormones can promote plant growth. Proline regulators can promote the synthesis of proline in plants and enhance their resistance to drought, cold and salt. Adding an appropriate amount of proline regulators can improve the growth and stress resistance of crops.

[0033] In some implementations of the embodiments of the present invention, the preparation method of the soil conditioner for improving salinization includes: S100, mixing the nanoparticles and the mineral particles, and performing ultrasonic dispersion treatment to obtain mixed particles; S200, adding biochar and composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding a plant growth regulator into deionized water to prepare a plant growth regulator solution, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution into the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment to obtain a soil conditioner for improving salinization.

[0034] Preferably, the nanoparticles are first mixed with the mineral particles and subjected to ultrasonic dispersion treatment. The ultrasonic dispersion treatment can make the nanoparticles and the mineral particles mixed more evenly, which is beneficial to the subsequent steps. The ultrasonic dispersion treatment is preferably carried out at room temperature and pressure using an ultrasonic treatment with a frequency of 30-40kHz for 10-25min to obtain a better dispersion effect; then the biochar and the composite organic acid are added to the mixed particles and stirred evenly, and then the plant growth regulator is prepared into a solution with a concentration of 2-10mg / L and dripped into the first mixed solution, so that the plant growth regulator and other components can be mixed more evenly, thereby further improving the effect of the prepared soil conditioner for improving salinization; finally, the carrier solution is dripped and stirred evenly, and then spraying and drying are carried out to form microcapsules. By making the soil conditioner for improving salinization into microcapsules, the slow release of the effective ingredients in the soil conditioner can be controlled, so that the soil conditioner can act in the soil for a long time and achieve better results; the preferred spray particle size for spraying treatment is 2-6μm, and hot air drying is quickly carried out after spraying treatment, and the hot air temperature is preferably 120-160℃.

[0035] Preferably, in the carrier solution, the carrier is preferably gelatin or sodium alginate, that is, the microcapsules of the soil conditioner for improving salinization can have a good sustained release effect and will not cause pollution to the soil; the mass ratio of the carrier material solution to the second mixed solution is (1-4):1, the release rate of the active ingredients in the soil conditioner is moderate, and a good soil improvement effect can be obtained.

[0036] Furthermore, the preparation method of the nanoparticles comprises: S110, ball-milling the calcium sulfate to obtain nano calcium sulfate particles; S120, dissolving the silicon source and the aluminum source in ethanol, adjusting the pH, adding a surfactant and a template agent, standing for 14-24 hours, and then sequentially drying and calcining to obtain nano zeolite particles; S130, mixing the nano calcium sulfate particles and the nano zeolite particles uniformly to obtain nano particles.

[0037] Preferably, when preparing nano calcium sulfate particles, ball milling is usually used to process calcium sulfate into nano particles, preferably a planetary ball mill is used for ball milling, and the ball milling medium preferably uses aluminum oxide balls with a diameter of 2-6 mm for ball milling under an inert gas atmosphere. The rotation speed of the ball milling is 100-300 rpm, and the time is 3-6 hours. After the ball milling, in order to avoid agglomeration, ultrasonic treatment can be used to disperse the nano calcium sulfate particles into uniform nano-scale particles; in order to further improve the quality of the nano calcium sulfate particles, the nano calcium sulfate particles can be dried in a vacuum drying manner to further remove moisture in the nano calcium sulfate particles.

[0038] Preferably, the nano zeolite particles are preferably prepared by a sol-gel method. First, an aluminum source and a silicon source are dissolved in ethanol, and the pH is adjusted to 7-9 to ensure that the zeolite has a good shape. The silicon source preferably includes any one of tetraethoxysilane, silicon dioxide or sodium silicate, and the aluminum source preferably includes any one of aluminum nitrate, aluminum hydroxide or sodium aluminate. Then, a surfactant and a template are added. The surfactant can make the formed gel more stable and help the subsequently prepared nano zeolite particles to be more uniform. The surfactant preferably includes sodium dodecylbenzene sulfonate, chloride any one of ammonium, cetylpyridinium chloride or polyvinyl alcohol; the template agent helps to form the microporous structure of the zeolite, and the template agent preferably includes any one of benzyl alcohol, tetraethylammonium chloride, tetramethylammonium chloride or dimethylethanolamine; then let it stand for 14-24 hours to react to form a gel, and then dry it to remove the solvent, and the drying treatment is preferably carried out at 100-150°C for 1-3 hours; finally, calcination treatment is performed to obtain nano zeolite particles, and the calcination treatment is preferably carried out at 300-600°C for 2-5 hours to obtain more uniform nano zeolite particles.

[0039] Embodiment 1 This embodiment provides a soil conditioner for improving salinization, which includes, by weight: 10 parts of nanoparticles, 5 parts of composite organic acid, 10 parts of biochar, 5 parts of mineral particles, and 1 part of plant growth regulator; wherein the preparation method of the soil conditioner for improving salinization includes: S100, after mixing the nanoparticles and the mineral particles, subjecting them to ultrasonic dispersion treatment at a frequency of 30 kHz for 25 minutes to obtain mixed particles; S200, adding biochar and composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding a plant growth regulator into deionized water to prepare a plant growth regulator solution with a concentration of 2 mg / L, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment, wherein the spray particle size is 2 μm, and the drying treatment is 120° C. hot air drying treatment, to obtain a soil conditioner for improving salinization; The nanoparticles are a mixture of nano calcium sulfate particles and nano zeolite particles, and the mass ratio of the nano calcium sulfate particles to the nano zeolite particles is 1:1; the composite organic acid includes a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid, and the mass ratio of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid is 1:0.3:0.3:0.2:0.2; the biochar is rice husk fermentation product, the mineral particles are dolomite particles, and the plant growth regulator is a plant hormone regulator.

[0040] Embodiment 2 This embodiment provides a soil conditioner for improving salinization, which includes, by weight: 30 parts of nanoparticles, 25 parts of composite organic acid, 20 parts of biochar, 15 parts of mineral particles, and 4 parts of plant growth regulator; wherein the preparation method of the soil conditioner for improving salinization includes: S100, after mixing the nanoparticles and the mineral particles, subjecting them to ultrasonic dispersion treatment at a frequency of 40 kHz for 10 minutes to obtain mixed particles; S200, adding biochar and composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding a plant growth regulator into deionized water to prepare a plant growth regulator solution with a concentration of 10 mg / L, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment, wherein the spray particle size is 6 μm, and the drying treatment is 160° C. hot air drying treatment, to obtain a soil conditioner for improving salinization; The nanoparticles are a mixture of nano calcium sulfate particles and nano zeolite particles, and the mass ratio of the nano calcium sulfate particles to the nano zeolite particles is 1:1.5; the composite organic acid includes a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid, and the mass ratio of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid is 1:0.6:0.5:0.3:0.3; the biochar is a mixture of rice husk fermentation product and fruit husk fermentation product, the mineral particles are a mixture of dolomite particles and pyroxene particles, and the plant growth regulator is a proline regulator.

[0041] Embodiment 3 This embodiment provides a soil conditioner for improving salinization, which includes, by weight: 20 parts of nanoparticles, 20 parts of composite organic acid, 15 parts of biochar, 10 parts of mineral particles, and 3 parts of plant growth regulator; wherein the preparation method of the soil conditioner for improving salinization includes: S100, after mixing the nanoparticles and the mineral particles, subjecting them to ultrasonic dispersion treatment at a frequency of 35 kHz for 20 minutes to obtain mixed particles; S200, adding biochar and composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding a plant growth regulator into deionized water to prepare a plant growth regulator solution with a concentration of 8 mg / L, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment, wherein the spray particle size is 5 μm, and the drying treatment is 140° C. hot air drying treatment, to obtain a soil conditioner for improving salinization; The nanoparticles are a mixture of nano calcium sulfate particles and nano zeolite particles, and the mass ratio of the nano calcium sulfate particles to the nano zeolite particles is 1:1.2; the composite organic acid includes a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid, and the mass ratio of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid is 1:0.5:0.4:0.3:0.3; the biochar is a mixture of rice husk fermentation product and fruit husk fermentation product, the mineral particles are a mixture of dolomite particles and pyroxene particles, and the plant growth regulator is a proline regulator; the preparation method of the nanoparticles includes: S110, ball milling the calcium sulfate with a planetary ball mill, using an aluminum oxide ball with a diameter of 2 mm as the ball milling medium under an argon atmosphere, with a ball milling speed of 100 rpm for 6 hours, and then sequentially performing ultrasonic treatment and vacuum drying to obtain nano calcium sulfate particles; S120, dissolving silicon dioxide and aluminum nitrate in ethanol, adjusting the pH to 7, adding sodium dodecylbenzene sulfonate and tetraethylammonium chloride, standing for 14 hours, drying at 100° C. for 3 hours, and finally calcining at 300° C. for 5 hours to obtain nano zeolite particles; S130, mixing the nano calcium sulfate particles and the nano zeolite particles uniformly to obtain nano particles.

[0042] Embodiment 4 This embodiment provides a soil conditioner for improving salinization, which includes, by weight: 20 parts of nanoparticles, 20 parts of composite organic acid, 15 parts of biochar, 10 parts of mineral particles, and 3 parts of plant growth regulator; wherein the preparation method of the soil conditioner for improving salinization includes: S100, after mixing the nanoparticles and the mineral particles, subjecting them to ultrasonic dispersion treatment at a frequency of 35 kHz for 20 minutes to obtain mixed particles; S200, adding biochar and composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding a plant growth regulator into deionized water to prepare a plant growth regulator solution with a concentration of 8 mg / L, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment, wherein the spray particle size is 5 μm, and the drying treatment is 140° C. hot air drying treatment, to obtain a soil conditioner for improving salinization; The nanoparticles are a mixture of nano calcium sulfate particles and nano zeolite particles, and the mass ratio of the nano calcium sulfate particles to the nano zeolite particles is 1:1.2; the composite organic acid includes a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid, and the mass ratio of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid is 1:0.5:0.4:0.3:0.3; the biochar is a mixture of rice husk fermentation product and fruit husk fermentation product, the mineral particles are a mixture of dolomite particles and pyroxene particles, and the plant growth regulator is a proline regulator; the preparation method of the nanoparticles includes: S110, ball milling the calcium sulfate with a planetary ball mill, using a 6 mm diameter alumina ball as the ball milling medium under an argon atmosphere, at a rotation speed of 300 rpm for 3 h, and then sequentially performing ultrasonic treatment and vacuum drying to obtain nano calcium sulfate particles; S120, dissolving tetraethoxysilane and sodium aluminate in ethanol, adjusting the pH to 9, adding cetylpyridinium chloride and dimethylethanolamine, standing for 24 hours, drying at 150° C. for 1 hour, and finally calcining at 600° C. for 2 hours to obtain nano zeolite particles; S130, mixing the nano calcium sulfate particles and the nano zeolite particles uniformly to obtain nano particles.

[0043] Comparative Example This comparative example provides a soil conditioner, which is purchased from outside and has gypsum as a main component.

[0044] Performance Testing The soil conditioners in Examples 1-4 and the comparative example were applied to the corn field, and the soil was tested after 30 days. The test results are shown in Table 1: Table 1 It can be seen from Table 1 that the various properties of Examples 1-4 are better than those of the comparative example, indicating that the soil conditioner for improving salinization described in the present invention can better improve the salinization problem of soil, especially the soil conditioner for improving salinization of Examples 3-4. This may be due to the use of more suitable process parameters and the preparation method of the nanoparticles described in the present invention, so that the obtained soil conditioner for improving salinization has better performance.

[0045] The soil conditioners of Examples 1-4 and the comparative example were applied to the corn fields respectively, and the leaf areas were compared with those of the blank control group (no soil conditioner was applied) at harvest. The plant height and leaf area of ​​the land using the soil conditioners for improving salinization of Examples 1-4 increased by about 40% compared with the blank control group, while the plant height and leaf area of ​​the land using the soil conditioners of the comparative example increased by only about 20% compared with the blank control group, indicating that the soil conditioners for improving salinization of Examples 1-4 can effectively improve the problem of land salinization and can be beneficial to plant growth to a certain extent.

[0046] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A soil conditioner for improving salinization, characterized in that: Calculated by mass, including: Nanoparticles: 10-30 parts, Compound organic acid: 5-25 parts, Biochar: 10-20 parts, Mineral particles: 5-15 parts, Plant growth regulators: 1-4 parts; The method for preparing the soil conditioner for improving salinization comprises: S100, mixing the nanoparticles and the mineral particles, and performing ultrasonic dispersion treatment to obtain mixed particles; S200, adding the biochar and the composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding the plant growth regulator into deionized water to prepare a plant growth regulator solution, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment to obtain the soil conditioner for improving salinization; The nanoparticles include a mixture of nano calcium sulfate particles and nano zeolite particles; The composite organic acid comprises a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid.

2. The soil conditioner for improving salinization according to claim 1, characterized in that: In the nanoparticles, the mass ratio of the nano calcium sulfate particles to the nano zeolite particles is (1-1.5):1; And / or in the composite organic acid, the mass ratio of the citric acid, the malic acid, the acetic acid, the oxalic acid and the fumaric acid is 1:(0.3-0.6):(0.3-0.5):(0.2-0.3):(0.2-0.3).

3. The soil conditioner for improving salinization according to claim 2, characterized in that: The biochar comprises at least one of rice husk fermentation, fruit husk fermentation, straw fermentation and wood fermentation; and / or the mineral particles include at least one of calcium carbonate particles, gypsum particles, dolomite particles and pyroxene particles; And / or the plant growth regulator includes at least one of a plant hormone regulator and a proline regulator.

4. A method for preparing a soil conditioner for improving salinization, characterized in that: Used to prepare the soil conditioner for improving salinization as claimed in any one of claims 1 to 3, the preparation method comprising: S100, mixing the nanoparticles and the mineral particles, and performing ultrasonic dispersion treatment to obtain mixed particles; S200, adding the biochar and the composite organic acid to the mixed particles, stirring evenly to obtain a first mixed solution; S300, adding the plant growth regulator into deionized water to prepare a plant growth regulator solution, and adding the plant growth regulator solution into the first mixed solution, stirring evenly, to obtain a second mixed solution; S400, adding the carrier material solution to the second mixed solution, stirring evenly, and sequentially performing spraying treatment and drying treatment to obtain the soil conditioner for improving salinization; Wherein, the nanoparticles include a mixture of nano calcium sulfate particles and nano zeolite particles; The composite organic acid comprises a mixture of citric acid, malic acid, acetic acid, oxalic acid and fumaric acid.

5. The preparation method according to claim 4, characterized in that: The preparation method of the nanoparticles comprises: S110, ball-milling the calcium sulfate to obtain the nano calcium sulfate particles; S120, dissolving the silicon source and the aluminum source in ethanol, adjusting the pH, adding a surfactant and a template agent, standing for 14-24 hours, and then sequentially drying and calcining to obtain the nano zeolite particles; S130, mixing the nano calcium sulfate particles and the nano zeolite particles uniformly to obtain the nano particles.

6. The preparation method according to claim 5, characterized in that: In the S120, The silicon source includes any one of tetraethoxysilane, silicon dioxide or sodium silicate; and / or the aluminum source includes any one of aluminum nitrate, aluminum hydroxide or sodium aluminate; and / or the surfactant includes any one of sodium dodecylbenzene sulfonate, ammonium chloride, cetylpyridinium chloride or polyvinyl alcohol; And / or the template includes any one of benzyl alcohol, tetraethylammonium chloride, tetramethylammonium chloride or dimethylethanolamine.

7. The preparation method according to claim 5, characterized in that: In S110, the ball milling medium of the ball milling treatment is an alumina ball, and the diameter of the alumina ball is 2-6 mm; And / or in S120, the pH is adjusted to 7-9; And / or in S120, the temperature of the calcination treatment is 300-600° C.; And / or in S120, the calcination treatment time is 2-5h; And / or in S120, the temperature of the drying process is 100-150°C; And / or in S120, the drying process is performed for 1-3 hours.

8. The preparation method according to claim 7, characterized in that: In the S100, The frequency of the ultrasonic dispersion treatment is 30-40kHz; And / or the time of the ultrasonic dispersion treatment is 10-25 min.

9. The preparation method according to claim 4, characterized in that: In the S300, the concentration of the plant growth regulator solution is 2-10 mg / L; And / or in said S400, in said carrier material solution, the carrier material comprises sodium alginate or gelatin; And / or in S400, the mass ratio of the carrier material solution to the second mixed solution is (1-4):

1.

10. An application of a soil conditioner for improving salinization, characterized in that: The soil conditioner for improving salinization is used for improving soil salinization.

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