Preparation method of intelligent response type soil conditioner based on nano composite material

Abstract

The invention discloses a preparation method of an intelligent response type soil conditioner based on a nano composite material, and belongs to the technical field of soil improvement. The modifier is prepared from 10 to 15 parts of modified chitosan, 15 to 25 parts of nano silicon dioxide, 20 to 30 parts of biochar-loaded polyglutamic acid, 8 to 15 parts of humic acid-sodium alginate microcapsules, 3 to 5 parts of trace element slow-release particles, 1 to 2 parts of a pH response type cross-linking agent and 15 to 25 parts of a functional agent. The soil conditioner researched and developed by the invention can flexibly adapt to complex and changeable soil environments, can sensitively sense dynamic changes of key environmental indexes such as soil humidity, pH value and temperature, automatically and accurately regulates and controls the release rate and the action effect of the soil conditioner, realizes multiple functions such as water retention, acid regulation, fertility increase and pollution resistance in a one-stop manner, and has a wide application prospect. High efficiency, long-term effect and ecological environment friendliness of soil improvement are comprehensively achieved, a new road is opened up for global soil improvement, and agricultural yield increase, ecological restoration and urban green development are assisted.

Description

Technical Field

[0001] The invention belongs to the technical field of soil improvement, and in particular relates to a method for preparing an intelligent responsive soil conditioner based on nanocomposite materials. Background Art

[0002] With the rapid advancement of urbanization and the increasingly urgent need for sustainable agricultural development, soil improvement has become a key breakthrough in solving a series of serious soil problems. As the foundation of agricultural production and an important part of the ecosystem, soil is facing unprecedented multiple challenges.

[0003] Traditional soil conditioners for optimizing fatigue soil fertility have exposed many defects that are difficult to ignore in actual application scenarios, which seriously restrict their effectiveness in soil improvement and the sustainable development of agriculture. The main reasons are: 1. Functional limitations. Many traditional conditioners can only play a role in a single soil problem, lack the ability to comprehensively deal with complex soil conditions, and are powerless against key problems such as concurrent pH imbalance and nutrient deficiency in the soil. 2. Poor effect stability. Under harsh climatic conditions of high temperature, drought and strong winds, the water originally stored in the soil by common water-retaining conditioners can easily be quickly lost through evaporation and wind blowing. This type of conditioner lacks the ability to adaptively adjust according to environmental changes, and cannot replenish or lock water in time when water is lost rapidly, so it cannot maintain the appropriate humidity of the soil for a long time, which makes crops face a water shortage crisis during the critical growth period. 3. Poor environmental adaptability. Traditional amendments are difficult to flexibly adjust their effects according to different soil types and climatic conditions. Soil types in different regions vary greatly, from sandy soils with coarse particles and large pores, to clay soils with heavy texture and poor aeration, to red soils with poor nutrients and strong acidity. Each soil has unique physical and chemical properties. However, many traditional amendments did not fully consider this diversity at the beginning of their design, resulting in their inability to effectively adapt to various soil environments in actual applications.

[0004] More worryingly, some traditional soil conditioners contain non-degradable chemical components such as polyethylene and polypropylene. During long-term use, these substances will gradually accumulate in the soil, bringing many negative impacts to the soil ecosystem. On the one hand, they will change the physical structure of the soil, fill the soil pores, hinder soil aeration and water permeability, make the soil become compact, impede root growth, and affect the absorption of water and nutrients by crops; on the other hand, non-degradable components will also affect the ecological balance of the soil microbial community. As an important part of the soil ecosystem, soil microorganisms participate in many key processes such as soil organic matter decomposition and nutrient cycling. The imbalance of its community structure will directly lead to the disorder of soil ecological functions, further weaken the soil productivity and self-repair ability, cause irreversible secondary pollution to the soil ecosystem, and seriously restrict the sustainable development of agriculture and the health and stability of the ecological environment. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a preparation method of an intelligent responsive soil conditioner based on nanocomposites.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The present invention provides an intelligent responsive soil conditioner based on nanocomposites, and the conditioner is composed of 10-15 parts of modified chitosan, 15-25 parts of nano-silica, 20-30 parts of biochar-loaded polyglutamic acid, 8-15 parts of humic acid-sodium alginate microcapsules, 3-5 parts of trace element slow-release granules, 1-2 parts of pH-responsive crosslinking agent, and 15-25 parts of functional agent;

[0008] In the biochar-loaded polyglutamic acid, the pore diameter of the biochar is 2-10 μm, and the loading rate is 10% PGA;

[0009] The wall material of the humic acid-sodium alginate microcapsule is sodium alginate-calcium chloride crosslinked gel;

[0010] The trace element slow-release granules are formed by embedding EDTA chelates containing Zn, Fe, and Cu into the starch matrix;

[0011] The pH-responsive crosslinking agent is polyethylene glycol diacrylate;

[0012] The functional agent is composed of humic acid, calcium magnesium phosphate fertilizer, nitrogen-fixing bacteria, and nano-hydroxyapatite with a mass ratio of 2∶1∶0∶5∶0.5.

[0013] The preparation method of the soil conditioner, the method includes the following steps,

[0014] S1. Dissolve chitosan in an acetic acid solution with a mass fraction of 2%, prepare a chitosan solution with a mass fraction of 2%, then add propylene oxide for reaction, and continuously introduce nitrogen for protection during the reaction; after the reaction, adjust the pH value to neutral with sodium hydroxide solution, then pour the solution into absolute ethanol for precipitation and filtration, let the filtered solution stand, wash the precipitate with absolute ethanol, and finally dry it under vacuum to obtain modified chitosan;

[0015] S2. Weigh humic acid, calcium magnesium phosphate fertilizer, nitrogen-fixing bacteria and nano-hydroxyapatite as functional components according to the mass ratio, add them to the filtered solution in sequence, then add a mixture of modified chitosan and 1 / 2 nano-silica, and mix well to obtain a composite core material;

[0016] S3. Mix biochar-loaded polyglutamic acid and humic acid-sodium alginate microcapsules, and then stir them evenly with the core material, and granulate by fluidized bed;

[0017] S4. Dry-mix the trace element slow-release granules with the remaining 1 / 2 nano-silica, and use electrostatic adsorption to coat them on the surface of the granulated product;

[0018] S5. Finally, spray and coat the particles again with a pH-responsive cross-linking agent solution (5wt%), and form a stimulus-responsive shell by vacuum drying to obtain a modifier.

[0019] Further, in step S1, the reaction conditions after adding propylene oxide are stirring reaction at 50 - 60 °C for 3 - 4 h; the mass fraction of the sodium hydroxide solution is 4 - 6%; the vacuum drying temperature of the precipitate is 60 - 70 °C.

[0020] Further, in step S2, the stirring speed after adding the modified chitosan is 400 - 600 rpm / min, and the stirring time is 40 - 60 min.

[0021] Further, in step S3, the inlet air temperature of the fluidized bed is 60 °C, and the obtained particle size is 1 - 3 mm.

[0022] Further, in step S4, the voltage during electrostatic adsorption is 10 - 20 kV.

[0023] Further, in step S5, the temperature during vacuum drying is 50 °C.

[0024] Further, when the modifier is applied to acidic soil, the application rate of the modifier is 30 - 60 kg per mu;

[0025] When the modifier is applied to alkaline soil, the application rate is 40 - 80 kg per mu;

[0026] The modifier is applied to contaminated soil, and the application rate is 50 - 100 kg per mu.

[0027] Furthermore, the application methods of the modifier include surface spreading, deep injection, or mixing with irrigation water;

[0028] After surface spreading of the modifier, shallow tillage is required, with a depth of 5 - 15 cm, to fully mix the modifier with the soil surface;

[0029] When the modifier is used for deep injection, it is applicable to the situation of deep soil pollution or the need to improve the deep soil structure. The injection depth is 20 - 50 cm, and the injection spacing is 30 - 60 cm;

[0030] When the modifier is mixed with irrigation water, the concentration of the modifier in water is 0.5% - 2%, and it is evenly distributed in the soil through the irrigation system.

[0031] Furthermore, when the modifier is mixed with irrigation water, the modifier powder or granules need to be pre - dispersed in a small amount of water first, using mechanical stirring or ultrasonic oscillation methods. The stirring speed is 300 - 500 rpm / min, the ultrasonic frequency is 10 - 30 kHz, and the oscillation time is 10 - 20 min.

[0032] The beneficial effects of the present invention are as follows:

[0033] 1. The present invention plays roles through the "core - shell - whisker" three - level structure. The biochar in the core layer provides a pore foundation, the silica - modified chitosan in the shell layer improves mechanical strength, and the pH - responsive cross - linker of the whiskers dynamically regulates nutrient release. Nano - silica and modified chitosan form an interpenetrating network through hydrogen bonding and electrostatic interactions, significantly improving the salt tolerance compared with single chitosan gel. The humic acid microcapsules are preferentially degraded under the stimulation of root exudates, realizing "root - guided" nutrient release.

[0034] 2. The soil modifier of the present invention has water - retention property, slow - release property, and can also resist soil compaction. The water - holding capacity reaches 8 times its own weight, extends the nitrogen release period, and the soil porosity increases by more than 25%.

[0035] 3. The soil modifier developed by the present invention can flexibly adapt to complex and changeable soil environments, can sensitively sense the dynamic changes of key environmental indicators such as soil humidity, pH value, temperature, etc., and automatically and precisely regulate its own release rate and action effect accordingly, achieving multiple functions such as water retention, acid adjustment, fertilizer increase, and pollution resistance in one - stop, comprehensively achieving the high efficiency, long - term effectiveness of soil improvement and the environmental friendliness to the ecological environment, opening up a new path for the global soil improvement cause, and helping agricultural production increase, ecological restoration, and urban green development.

[0036] Other advantages, objects, and features of the present invention will be set forth in the following description, and to some extent will be obvious to those skilled in the art, or can be taught from the practice of the present invention. The objects and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the objects, technical solutions, and beneficial effects of the invention clearer, the present invention provides the following drawings for illustration:

[0038] Figure 1 It is a flowchart for the preparation of the modifier of the present invention;

[0039] Figure 2 It is a schematic diagram of the finished product of the modifier of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] As Figure 1-2 shown, the present invention provides a preparation method of an intelligent responsive soil modifier based on a nanocomposite:

[0041] S1. Dissolve 10 parts of chitosan in an acetic acid solution with a mass fraction of 2% to prepare a chitosan solution with a mass fraction of 2%. Then add 1 part of propylene oxide and stir at 55 °C for 3.5 h, and continuously introduce nitrogen for protection during the reaction. After the reaction, adjust the pH value to neutral with a 5% sodium hydroxide solution, then pour the solution into anhydrous ethanol for precipitation and filtration. Let the filtered solution stand, wash the precipitate with anhydrous ethanol, and finally dry it in a vacuum at 65 °C to obtain modified chitosan;

[0042] S2. Weigh humic acid, calcium magnesium phosphate fertilizer, nitrogen-fixing bacteria, and nano-hydroxyapatite as functional components according to a mass ratio of 2:1:0:5:0.5, and add them to the filtered solution in sequence. Then add a mixture of modified chitosan and 10 parts of nano-silica and mix well. Stir at 500 rpm / min for 50 min to obtain a composite core material;

[0043] S3. Mix 20 parts of biochar-loaded polyglutamic acid and 12 parts of humic acid-sodium alginate microcapsules, and then stir evenly with the composite core material. Granulate through a fluidized bed to obtain particles with a particle size of 1.5 mm, and the inlet air temperature of the fluidized bed is 60 °C;

[0044] S4. Dry-mix 4 parts of trace element slow-release particles and 10 parts of nano-silica, and use electrostatic adsorption with a voltage of 15 KV to coat them on the surface of the granulated product;

[0045] S5. Finally, spray and coat the particles again with 1.5 parts of a pH-responsive cross-linking agent solution (5 wt%) and dry them in a vacuum at 50 °C to form a stimulus-responsive shell to obtain the modifier.

[0046] Verification 1:

[0047] Take a small piece of sandy loam soil in a typical arid area in the northwest of China and make a test field with an area of 0.5 mu.

[0048] After detection and analysis, the field water holding capacity of this soil is only 6% (mass water content), and its water retention ability is poor; in the soil particle composition, the sand particles with a particle size of 0.05 - 2 mm account for as high as 83%, resulting in a high water permeability, and the water loss rate within 24 hours after irrigation exceeds 72%; the organic matter content is as low as 0.35%, the total nitrogen content is 0.022%, the available phosphorus content is 3.2 mg / kg, and the available potassium content is 42 mg / kg, with a lack of nutrients; the soil microbial community structure is single, the number of bacteria in each gram of dry soil is about 1.2×104, the number of fungi is about 6×10 2 individuals, and the microbial activity (measured by dehydrogenase activity) is only 0.12 μg TPF / g·h, with a weak ability to decompose organic residues.

[0049] For the wheat traditionally planted locally, the average yield per mu has been around 160 kg for a long time.

[0050] Improvement measures: Select the soil conditioner prepared by the present invention. According to the soil test data and the area of the test field, it is calculated that 60 kg needs to be applied per mu. A total of 30 kg of soil conditioner is required for the test field selected in the present invention, and the soil conditioner is made into a powder with an average particle size of 100 μm.

[0051] One week before spring sowing, adopt the method of manual spreading to ensure the uniform distribution of the soil conditioner. After the spreading is completed, use a small rotary tiller for shallow tillage operation, and strictly control the shallow tillage depth at 10 cm to fully mix the soil conditioner with the 0 - 10 cm soil tillage layer.

[0052] Effect monitoring: Within the first month after sowing, arrange 3 soil moisture sensors (with an accuracy of 0.1%) in the test field to monitor the change of soil water content in real time.

[0053] According to the data, the nano - carriers in the soil conditioner can intelligently respond to the arid environment, and the water - retaining functional components are slowly released. The average soil water content has increased compared with that before improvement. In the case of no rainfall, the average soil water content reaches 8.5% on the 10th day, rises to 10.5% on the 20th day, and stabilizes at about 12.5% at the end of the month. The water loss rate has decreased by 52% compared with the same period before improvement.

[0054] When the wheat enters the jointing stage, select 3 sampling points in the test field, collect the soil mixed samples with a depth of 0 - 20 cm at each sampling point for experimental analysis. The results show that the organic matter content in the soil has increased significantly to 2.3%, the number of soil microorganisms has increased greatly, and the number of bacteria reaches 5.2×10 per gram of dry soil 5pieces, the number of fungi increased to 3.2×10 3 pieces, and the microbial activity increased to 0.52 μg TPF / g·h.

[0055] Sampling and analysis were carried out on wheat plants. The fresh weight of the roots increased by an average of 62% compared to the unimproved area. The height of the above-ground part of the plants increased by an average of 22 cm, the stem diameter increased by 0.22 cm, and the chlorophyll content in the leaves increased by 32%. At the harvest season, through actual yield measurement, the average mu yield of wheat reached 260 kg, an increase of 62.5% compared to the same period of the previous year.

[0056] Verification 2 (remediation of heavy metal contaminated farmland):

[0057] Select a farmland with an area of 0.3 mu that has been contaminated by heavy metals such as lead and cadmium for a long time.

[0058] After testing, the average lead content in the soil was as high as 310 mg / kg, and the cadmium content reached 5.3 mg / kg, far exceeding the risk screening values specified in the "Soil Environmental Quality - Risk Control Standards for Soil Pollution of Agricultural Land (Trial)" (GB 15618-2018). This led to heavy metal exceeding the standard in agricultural products, making them inedible, and the soil fertility continued to decline.

[0059] The enzyme activity in the soil was severely inhibited. The urease activity was only 0.22 mg NH3-N / g·24h, and the catalase activity was 2.2 mL O2 / g·20min. The soil microbial community was damaged, and the number of beneficial microorganisms decreased sharply. The number of nitrogen-fixing bacteria in each gram of dry soil was less than 1.2×10 2 pieces, the soil was compacted, and the air and water permeability was poor.

[0060] Improvement measures: For this pollution situation, prepare the soil conditioner of the present invention into granular form with an average particle size of 3 mm, and apply it at a rate of 80 kg per mu. A total of 24 kg of conditioner is required for this test field. The deep injection method is used. Use a small drilling device to drill holes at intervals of 40 cm, and inject the soil conditioner to a depth of 30 cm into the soil through an injection gun. During the injection process, strictly control the injection pressure at 0.5 MPa and the flow rate at 5 L / min.

[0061] Effect monitoring: After a growing season (about 6 months), 5 sampling points were evenly selected in the test field, and soil samples with a depth of 0-40 cm were collected for heavy metal content detection. It was found that the lead content decreased to 108 mg / kg, and the cadmium content decreased to less than 0.8 mg / kg.

[0062] During the same period, soil samples were collected to analyze the microbial status and nutrient content. It was found that microbial agents such as nitrogen-fixing bacteria in the soil gradually recovered their activity, and the number of nitrogen-fixing bacteria in each gram of dry soil increased to 5.2×10 3The amount of ammonium nitrogen in the soil increased from almost zero to 10.8 mg / kg. The calcium magnesium phosphate fertilizer continuously released nutrients, and the available phosphorus content in the soil increased from 3.2 mg / kg to 8.2 mg / kg.

[0063] Some vegetable varieties with strong heavy metal tolerance could gradually be planted in the originally barren farmland. After testing, the quality of agricultural products met the standards, and the lead and cadmium contents in the vegetables were both lower than the limits of the national food safety standards.

[0064] Verification Three (Urban Greening Soil Improvement):

[0065] A greening area with construction waste backfill soil was demarcated, with an area of 20 square meters.

[0066] After testing, the soil bulk density was as high as 1.78 g / cm 3 , and the porosity was only 32%, indicating that the soil was compact and had poor air permeability; the soil was alkaline, with a pH value as high as 8.4, which was not conducive to the growth of most garden plants; the soil organic matter content was extremely low, only 0.22%, the total nitrogen content was 0.012%, the available phosphorus content was 2.2 mg / kg, and the available potassium content was 32 mg / kg, with weak fertilizer retention capacity.

[0067] The survival rates of the previously planted flowers and lawns were low. The mortality rate of the flowers reached 72%, and the withering rate of the lawn reached 82%, resulting in a poor landscape effect.

[0068] Improvement measures: The soil conditioner of the present invention was made into a powder with an average particle size of 80 μm. According to the dosage of 1 kg per square meter, a total of 20 kg was required for this area and was evenly spread on the surface of the greening soil. After spreading, workers were arranged to use small rakes for plowing, with a plowing depth of about 5 cm, so that the conditioner was evenly mixed with the surface soil.

[0069] Effect monitoring: Within one month after planting, 5 pH sensors (with an accuracy of 0.05) were arranged in the greening area to monitor the change of soil acidity and alkalinity in real time.

[0070] The data showed that the acidic components such as humic acid in the soil conditioner adjusted the soil acidity and alkalinity. On the 7th day after planting, the soil pH value dropped to 8.1, on the 15th day it dropped to 7.6, and it stabilized between 7.2 - 7.5 at the end of the month.

[0071] Three months later, 5 sampling points were selected in the greening area, and soil mixed samples with a depth of 0 - 10 cm were collected at each sampling point for laboratory analysis. The results showed that the soil organic matter content increased to 3.3%, the soil became loose and porous, the porosity increased to 46%, and the air permeability was significantly enhanced. The survival rate of the flowers increased from 28% before to over 93%, and the withering rate of the lawn decreased to less than 9%, effectively improving the quality of the greening landscape.

[0072] The above experiments have all proved that through precise data monitoring, the excellent application effects of the soil conditioner of the present invention in different soil problem scenarios are fully demonstrated, and it can exert force precisely according to soil characteristics to achieve efficient and sustainable soil improvement.

[0073] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A preparation method of an intelligent responsive soil conditioner based on a nanocomposite material, characterized in that: The modifier consists of 10 - 15 parts of modified chitosan, 15 - 25 parts of nano - silica, 20 - 30 parts of polyglutamic acid - loaded biochar, 8 - 15 parts of humic acid - sodium alginate microcapsules, 3 - 5 parts of trace element slow - release granules, 1 - 2 parts of pH - responsive cross - linker, and 15 - 25 parts of functional agent; In the polyglutamic acid - loaded biochar, the pore diameter of the biochar is 2 - 10 μm, and the loading rate of PGA is 10%; The wall material of the humic acid - sodium alginate microcapsule is sodium alginate - calcium chloride cross - linked gel; The trace element slow - release granules are formed by embedding EDTA chelates containing Zn, Fe, and Cu into a starch matrix; The pH - responsive cross - linker is polyethylene glycol diacrylate; The functional agent is composed of humic acid, calcium - magnesium phosphate fertilizer, nitrogen - fixing bacteria, and nano - hydroxyapatite with a mass ratio of 2∶1∶0∶5∶0.5; The preparation method of the soil modifier, the method includes the following steps, S1. Dissolve chitosan in an acetic acid solution with a mass fraction of 2% to prepare a chitosan solution with a mass fraction of 2%. Then add propylene oxide and react, continuously introducing nitrogen for protection during the reaction. After the reaction, adjust the pH value to neutral with a sodium hydroxide solution, then pour the solution into absolute ethanol for precipitation and filtration. Let the filtered solution stand, wash the precipitate with absolute ethanol, and finally dry it under vacuum to obtain modified chitosan; S2. Weigh humic acid, calcium - magnesium phosphate fertilizer, nitrogen - fixing bacteria, and nano - hydroxyapatite as functional components according to the mass ratio, add them to the filtered solution in sequence, and then add a mixture of modified chitosan and 1 / 2 of the nano - silica, and mix evenly to obtain a composite core material; S3. Mix the polyglutamic acid - loaded biochar and the humic acid - sodium alginate microcapsules, and then stir them evenly with the core material, and granulate through a fluidized bed; S4. Dry - mix the trace element slow - release granules with the remaining 1 / 2 of the nano - silica, and use electrostatic adsorption to coat them on the surface of the granulated product; S5. Finally, spray - coat the particles again with a pH - responsive cross - linker solution (5 wt%) and form a stimulus - responsive outer shell by vacuum drying to obtain the modifier.

2. The preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 1, wherein: In step S1, the reaction conditions after adding propylene oxide are stirring and reacting at 50 - 60 °C for 3 - 4 h; the mass fraction of the sodium hydroxide solution is 4 - 6%; the vacuum drying temperature of the precipitate is 60 - 70 °C.

3. The preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 2, wherein: In step S2, the stirring speed after adding the modified chitosan is 400 - 600 rpm / min, and the stirring time is 40 - 60 min.

4. A preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 2, characterized in that: In step S3, the inlet air temperature of the fluidized bed is 60 °C, and the obtained particle size is 1 - 3 mm.

5. The preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 4, characterized in that: In step S4, the voltage during electrostatic adsorption is 10 - 20 kV.

6. The preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 5, characterized in that: In step S5, the temperature during vacuum drying is 50 °C.

7. The preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 6, characterized in that: When the modifier is applied to acidic soil, the application rate of the modifier is 30 - 60 kg per mu; When the modifier is applied to alkaline soil, the application rate is 40 - 80 kg per mu; When the modifier is applied to polluted soil, the application rate is 50 - 100 kg per mu.

8. A preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 7, characterized in that: The application methods of the modifier include surface spreading, deep injection, or mixing with irrigation water for application; After the surface application of the modifier, shallow tillage is required, with a depth of 5 - 15 cm, to fully mix the modifier with the soil surface layer; When the modifier is injected deep, it is applicable to the situation of deep soil pollution or the need to improve the deep soil structure. The injection depth is 20 - 50 cm, and the injection spacing is 30 - 60 cm; When the modifier is applied by mixing with irrigation water, the concentration of the modifier in water is 0.5% - 2%, and it is evenly distributed in the soil through the irrigation system.

9. The preparation method of an intelligent responsive soil conditioner based on a nanocomposite material according to claim 8, wherein: When the modifier is applied by mixing with irrigation water, the modifier powder or granules need to be pre-dispersed in a small amount of water first, using mechanical stirring or ultrasonic oscillation. The stirring speed is 300 - 500 rpm / min, the ultrasonic frequency is 10 - 30 kHz, and the oscillation time is 10 - 20 min.

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