Aluminum control acid-resistant micro-nano composite mineral conditioner and preparation method thereof

Abstract

The application belongs to the technical field of soil improvement, and relates to a kind of acid-resistant and aluminum-controlling micro-nano composite mineral conditioner and a preparation method thereof, specifically comprising the following steps: step (1) crushing floatstone, wollastonite, serpentine, oyster shell and phosphorite; step (2) preparing micro-nano mineral material; step (3) preparing humic acid modified phosphorite; step (4) mixing and granulating the micro-nano mineral material and the humic acid modified phosphorite to obtain component A; step (5) mixing spruce extract and betaine to obtain conditioner component B; and step (6) fully mixing component B with component A at a mass ratio of 0.01% to 0.10% to obtain the conditioner. The conditioner prepared by the application can stabilize soil structure, reduce the activity of aluminum, manganese and iron ions, promote the combination of organic small molecules and inorganic ions, prevent the decomposition of clay minerals, and reduce soil heavy metals and active aluminum. The acid-resistant and aluminum-controlling micro-nano composite mineral conditioner with high activity and dispersity can efficiently improve the physicochemical properties of acidic soil and promote crop growth.

Description

Technical Field

[0001] This invention belongs to the technical field of soil improvement, and relates to an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner and its preparation method. Background Technology

[0002] Soil acidification is a form of soil degradation. It causes the deterioration of soil's physical and chemical properties, disrupts the balance of soil nutrient supply, and produces free aluminum ions and heavy metal ions that are toxic to plants, inhibiting root growth and normal physiological activities, thus affecting crop growth and development, as well as the yield and quality of agricultural products. The dry and wet deposition of waste generated by modern industrial development and the irrational use of chemical fertilizers also accelerate the soil acidification process.

[0003] Applying soil conditioners is an important measure to inhibit soil acidification, regulate soil physicochemical properties, and balance soil nutrients. However, existing soil conditioners have the following drawbacks: (1) Few varieties and weak targeting. Very few are targeted at the causes and hazards of soil acidification, making it difficult to achieve both symptomatic and root-cause treatment. There is a lack of treatment targeting the characteristics of soil acidification. The raw material formula is either too simple or too complicated. Some soil conditioners pile up a dozen or dozens of ingredients together, resulting in insufficient dosage of various ingredients and limited actual effectiveness. Production costs soar, but there is no practical value, and they become decorative formulas. (2) Backward processing technology. Mineral-formed soil conditioners are generally insoluble in water. Due to the limitations of solid form and dosage, their effectiveness in reacting with soil particles is limited. The soil conditioner particles are coarse and have low activity. They have limited contact with soil particles and low efficiency. They are difficult to contact most soil particles in the topsoil. There are problems of slow improvement of soil properties and low efficiency at both the macroscopic and microscopic levels.

[0004] For example, patent 202211119430.6 provides a conditioner for alleviating soil acidification, along with its preparation and application methods. This invention primarily uses biochar as its main component, supplemented with a small amount of alkaline components. Its mechanism involves adsorbing active aluminum in acidic soil and providing a small amount of alkaline material. However, once the adsorption reaches saturation, it becomes difficult to continue its effect, and the low alkaline content limits its efficiency in regulating soil acidity, thus only providing localized relief for soil acidification.

[0005] CN113652242A patent provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, its preparation method, and its application. This invention's acid soil conditioner, based on its composition, plays a certain regulatory role in acidic soils. However, animal manure and straw are easily degraded, while biochar and humic acid can only play an adsorption role. Quicklime, as a conventional acidifier, is present in a small proportion, thus its improvement efficiency is low and it cannot balance the nutrient imbalance in acidified soils. Summary of the Invention

[0006] To address the above problems, this invention provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner and its preparation method, comprising the following steps:

[0007] Step (1): Pumice, wollastonite, serpentine, oyster shell, and phosphate rock are dried at 100-200℃ and pulverized to a fineness of 600 mesh or higher.

[0008] Step (2): Mix the crushed pumice, wollastonite, serpentine and oyster shells, and ball mill them for 2-5 hours using a high-energy ball mill to obtain micro-nano mineral materials.

[0009] Step (3) Mix humic acid and crushed phosphate rock and then ball mill it for 1-4 hours using a high-energy ball mill to obtain humic acid modified phosphate rock.

[0010] Step (4): The micro-nano mineral materials obtained in steps (2)-(3) and humic acid modified phosphate rock are stirred evenly and granulated to obtain conditioner component A.

[0011] Step (5) Spruce extract and betaine are mixed to obtain conditioner component B;

[0012] Step (6) Mix component B with component A at a mass ratio of 0.01%-0.10% to obtain an acid-resistant and aluminum-controlled micro / nano composite mineral conditioner.

[0013] Preferably, the preparation method of the spruce extract in step (5) is as follows: take dried spruce leaves, pulverize them, mix them with ethanol at a ratio of 1g:18ml, and then extract them at 70℃ for 2 hours each time, for a total of three times. After filtration, the extract is evaporated under reduced pressure at 40℃ to form crystals, thereby obtaining the spruce extract.

[0014] Preferably, by weight, it includes 10-40 parts pumice, 20-38 parts wollastonite, 25-35 parts serpentine, 29-60 parts oyster shell, 19-33 parts phosphorite, 5-20 parts humic acid, 1-8 parts spruce extract and 0.5-2.5 parts betaine.

[0015] The present invention also provides a method for applying the acid-resistant and aluminum-controlling micro-nano composite mineral conditioner, which is applied to the soil at a rate of 150 kg per acre.

[0016] The present invention has the following advantages:

[0017] The invention addresses the characteristics of acidic soils by reducing the harmful effects of acidification and reducing conditions on crops, and preventing soil acidification during the drying process. The main mechanism of this soil conditioner is to stabilize soil structure, reduce the activity of aluminum, manganese, and iron ions, and promote the binding of small organic molecules with inorganic ions. In practice, it utilizes silicon, calcium, and phosphorus-containing mineral materials to balance soil nutrients, prevent the decomposition of clay minerals, and reduce heavy metals and active aluminum in the soil, achieving a comprehensive solution. This invention, through the preparation of a highly active and dispersible acid-inhibiting and aluminum-controlling micro-nano composite mineral conditioner, can effectively improve the physicochemical properties of acidic soils and promote crop growth. Detailed Implementation

[0018] The technical solutions in the embodiments of the invention are described clearly and completely below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1

[0020] This embodiment provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, the raw materials for which it is prepared by weight include:

[0021] 10 portions of pumice;

[0022] 20 parts of wollastonite;

[0023] 25 portions of serpentine;

[0024] 50 portions of oyster shells;

[0025] 30 portions of phosphorite;

[0026] 5 parts humic acid;

[0027] 5 parts of spruce extract;

[0028] 1.5 parts betaine.

[0029] The preparation method of the spruce extract is as follows: Dry and pulverize spruce leaves, mix with 70% ethanol (volume fraction) at a ratio of 1g:18ml, and then extract at 70℃ for 2 hours each time, for a total of three operations. After filtration, evaporate under reduced pressure at 40℃, centrifuge at 4000r / min for 10 minutes, and collect the supernatant. After filtration, evaporate under reduced pressure at 40℃ to form crystals, thus obtaining the spruce extract.

[0030] This embodiment provides a method for preparing the acid-resistant and aluminum-controlled micro / nano composite mineral conditioner, including the following steps:

[0031] Step (1): Pumice, wollastonite, serpentine and phosphate rock are dried at a low temperature of 105℃ and then pulverized to a fineness of 600 mesh or higher using a Raymond mill.

[0032] Step (2): Crush the oyster shells to a fineness of 300 mesh or higher;

[0033] Step (3): Mix the above-processed pumice, wollastonite, serpentine and oyster shells in proportion and ball mill them for 3 hours using a high-energy ball mill to obtain micro-nano mineral materials.

[0034] Step (4): Mix the crushed phosphate rock with humic acid in a certain proportion and then ball mill it for 3 hours using a high-energy ball mill to obtain humic acid modified phosphate rock.

[0035] Step (5): The micro-nano mineral material and humic acid modified phosphorus rock are stirred evenly and granulated to obtain conditioner component A;

[0036] Step (6): Mix spruce extract and betaine to obtain component B;

[0037] Step (7): Mix component B with component A at a mass ratio of 0.05% to obtain an acid-resistant and aluminum-controlled micro / nano composite mineral conditioner.

[0038] This embodiment provides a method for using the acid-resistant and aluminum-controlling micro-nano composite mineral conditioner, which is applied to the soil at a rate of 150 kg per acre.

[0039] Example 2

[0040] This embodiment provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, the raw materials for which it is prepared by weight include:

[0041] 15 portions of pumice;

[0042] 30 parts of wollastonite;

[0043] 25 portions of serpentine;

[0044] 50 portions of oyster shells;

[0045] 30 portions of phosphorite;

[0046] 15 parts humic acid;

[0047] 7 parts of spruce extract;

[0048] 1.5 parts betaine.

[0049] The preparation method of the spruce extract is as follows: Dry and pulverize spruce leaves, mix with 70% ethanol (volume fraction) at a ratio of 1g:18ml, and then extract at 70℃ for 2 hours each time, for a total of three operations. After filtration, evaporate under reduced pressure at 40℃, centrifuge at 4000r / min for 10 minutes, and collect the supernatant. After filtration, evaporate under reduced pressure at 40℃ to form crystals, thus obtaining the spruce extract.

[0050] This embodiment provides a method for preparing the acid-resistant and aluminum-controlled micro / nano composite mineral conditioner:

[0051] Step (1): Pumice, wollastonite, serpentine and phosphate rock are dried at a low temperature of 105℃ and then pulverized to a fineness of 600 mesh or higher using a Raymond mill.

[0052] Step (2): Crush the oyster shells to a fineness of 300 mesh or higher;

[0053] Step (3): Mix the above-processed pumice, wollastonite, serpentine and oyster shells in proportion and ball mill them for 3 hours using a high-energy ball mill to obtain micro-nano mineral materials.

[0054] Step (4): Mix the crushed phosphate rock with humic acid in a certain proportion and then ball mill it for 3 hours using a high-energy ball mill to obtain humic acid modified phosphate rock.

[0055] Step (5): The micro-nano mineral material and humic acid modified phosphorus rock are stirred evenly and granulated to obtain conditioner component A;

[0056] Step (6): Mix spruce extract and betaine to obtain component B;

[0057] Step (7): Mix component B with component A at a mass ratio of 0.05% to obtain an acid-resistant and aluminum-controlled micro / nano composite mineral conditioner.

[0058] This embodiment provides a method for using the acid-resistant and aluminum-controlling micro-nano composite mineral conditioner, which is applied to the soil at a rate of 150 kg per acre.

[0059] Example 3

[0060] This embodiment provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, the raw materials for which it is prepared by weight include:

[0061] 10 portions of pumice;

[0062] 20 parts of wollastonite;

[0063] 25 portions of serpentine;

[0064] 50 portions of oyster shells;

[0065] 30 portions of phosphorite;

[0066] 5 parts humic acid;

[0067] 5 parts of spruce extract;

[0068] 1.5 parts betaine.

[0069] The preparation method of the spruce extract is as follows: Dry and pulverize spruce leaves, mix with 70% ethanol (volume fraction) at a ratio of 1g:18ml, and then extract at 70℃ for 2 hours each time, for a total of three operations. After filtration, evaporate under reduced pressure at 40℃, centrifuge at 4000r / min for 10 minutes, and collect the supernatant. After filtration, evaporate under reduced pressure at 40℃ to form crystals, thus obtaining the spruce extract.

[0070] This embodiment provides a method for preparing the acid-resistant and aluminum-controlled micro / nano composite mineral conditioner:

[0071] Step (1): Pumice, wollastonite, serpentine and phosphate rock are dried at a low temperature of 105℃ and then pulverized to a fineness of 600 mesh or higher using a Raymond mill.

[0072] Step (2): Crush the oyster shells to a fineness of 200 mesh or higher;

[0073] Step (3): Mix the above-processed pumice, wollastonite, serpentine and oyster shells in proportion and mechanically ball mill them for 3 hours using a high-energy ball mill to obtain micro-nano mineral materials.

[0074] Step (4): Mix the crushed phosphate rock with humic acid in a certain proportion and then mechanically ball mill it for 3 hours using a high-energy ball mill to obtain humic acid modified phosphate rock.

[0075] Step (5): The micro-nano mineral material and humic acid modified phosphorus rock are stirred evenly and granulated to obtain conditioner component A;

[0076] Step (6): Mix spruce extract and betaine to obtain component B;

[0077] Step (7): Mix component B with component A at a mass ratio of 0.05% to obtain an acid-resistant and aluminum-controlled micro / nano composite mineral conditioner.

[0078] This embodiment provides a method for using the acid-resistant and aluminum-controlling micro-nano composite mineral conditioner, which is applied to the soil at a rate of 150 kg per acre.

[0079] Example 4

[0080] This embodiment provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, the raw materials for which it is prepared by weight include:

[0081] 10 portions of pumice;

[0082] 30 parts of wollastonite;

[0083] 25 portions of serpentine;

[0084] 48 portions of oyster shells;

[0085] 30 portions of phosphorite;

[0086] 5 parts humic acid;

[0087] 5 parts of spruce extract;

[0088] 1.5 parts betaine.

[0089] The preparation method of the spruce extract is as follows: Dry and pulverize spruce leaves, mix with 70% ethanol (volume fraction) at a ratio of 1g:18ml, and then extract at 70℃ for 2 hours each time, for a total of three operations. After filtration, evaporate the extract under reduced pressure at 40℃, centrifuge at 4000r / min for 10 minutes, and collect the supernatant. After filtration, evaporate the extract under reduced pressure at 40℃ to form crystals, thus obtaining the spruce extract.

[0090] This embodiment provides a method for preparing the acid-resistant and aluminum-controlling composite mineral conditioner, and the preparation process steps are as follows:

[0091] Step (1): Pumice, wollastonite, serpentine, phosphate rock and oyster shells are dried at a low temperature of 105℃ and then pulverized to a fineness of 600 mesh or higher using a Raymond mill.

[0092] Step (2): The mixture obtained in step (1) is mixed with humic acid in a certain proportion and then granulated by a granulator to prepare component A;

[0093] Step (3): Spruce extract and betaine are mixed to obtain component B;

[0094] Step (4): Mix component B with component A at a mass ratio of 0.05% to obtain an acid-resistant and aluminum-controlling composite mineral conditioner.

[0095] This embodiment provides a method for using the acid-inhibiting and aluminum-controlling composite mineral conditioner, which is applied to the soil at a rate of 150 kg per acre.

[0096] Example 5

[0097] This embodiment provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, the raw materials for which it is prepared by weight include:

[0098] 25 portions of pumice;

[0099] 20 parts of wollastonite;

[0100] 25 portions of serpentine;

[0101] 50 portions of oyster shells;

[0102] 28 samples of phosphorite;

[0103] 10 parts humic acid;

[0104] 5 parts of spruce extract;

[0105] 1.5 parts betaine.

[0106] The preparation method of the spruce extract is as follows: Dry and pulverize spruce leaves, mix with 70% ethanol (volume fraction) at a ratio of 1g:18ml, and then extract at 70℃ for 2 hours each time, for a total of three operations. After filtration, evaporate the extract under reduced pressure at 40℃, centrifuge at 4000r / min for 10 minutes, and collect the supernatant. After filtration, evaporate the extract under reduced pressure at 40℃ to form crystals, thus obtaining the spruce extract.

[0107] This embodiment provides a method for preparing the acid-resistant and aluminum-controlling micro / nano composite mineral conditioner. The preparation process steps are as follows:

[0108] Step (1): Pumice, wollastonite, serpentine, phosphate rock and oyster shells are dried at a low temperature of 105℃ and then pulverized to a fineness of 600 mesh or higher using a Raymond mill.

[0109] Step (2): Mix the above-processed pumice, wollastonite, serpentine and oyster shells in proportion and ball mill them for 3 hours using a high-energy ball mill to obtain micro-nano mineral materials.

[0110] Step (3): Mix the crushed phosphate rock with humic acid in a certain proportion and then ball mill it for 3 hours using a high-energy ball mill to obtain humic acid modified phosphate rock.

[0111] Step (4): The micro-nano mineral material and humic acid modified phosphorus rock are stirred evenly and granulated to obtain conditioner component A;

[0112] Step (5): Mix spruce extract and betaine to obtain component B;

[0113] Step (6): Mix component B with component A at a mass ratio of 0.05% to obtain an acid-resistant and aluminum-controlled micro / nano composite mineral conditioner.

[0114] This embodiment provides a method for using the acid-resistant and aluminum-controlling micro-nano composite mineral conditioner, which is applied to the soil at a rate of 150 kg per acre.

[0115] Example 6

[0116] This embodiment provides an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, the raw materials for which it is prepared by weight include:

[0117] 10 portions of pumice;

[0118] 20 parts of wollastonite;

[0119] 25 portions of serpentine;

[0120] 50 portions of oyster shells;

[0121] 30 portions of phosphorite;

[0122] 5 parts humic acid;

[0123] 5 parts of spruce extract;

[0124] 1.5 parts betaine.

[0125] The preparation method of the spruce extract is as follows: Dry and pulverize spruce leaves, mix with 70% ethanol (volume fraction) at a ratio of 1g:18ml, and then extract at 70℃ for 2 hours each time, for a total of three operations. After filtration, evaporate the extract under reduced pressure at 40℃, centrifuge at 4000r / min for 10 minutes, and collect the supernatant. After filtration, evaporate the extract under reduced pressure at 40℃ to form crystals, thus obtaining the spruce extract.

[0126] This embodiment provides a method for preparing the acid-resistant and aluminum-controlling micro / nano composite mineral conditioner. The preparation process steps are as follows:

[0127] Step (1): Pumice, wollastonite, serpentine, phosphate rock and oyster shells are dried at a low temperature of 105℃ and then pulverized to a fineness of 600 mesh or higher using a Raymond mill.

[0128] Step (2): Mix the above-processed pumice, wollastonite, serpentine and oyster shells in proportion and ball mill them for 3 hours using a high-energy ball mill to obtain micro-nano mineral materials.

[0129] Step (3): Mix the crushed phosphate rock with humic acid in a certain proportion and then ball mill it for 3 hours using a high-energy ball mill to obtain humic acid modified phosphate rock.

[0130] Step (4): The micro-nano mineral material and humic acid modified phosphorus rock are stirred evenly and granulated to obtain conditioner component A;

[0131] Step (5): Mix spruce extract and betaine to obtain component B;

[0132] Step (6): Mix component B with component A at a mass ratio of 0.05% to obtain an acid-resistant and aluminum-controlled micro / nano composite mineral conditioner.

[0133] This embodiment provides a method for using the acid-resistant and aluminum-controlling micro-nano composite mineral conditioner, which is applied to the soil at a rate of 150 kg per acre.

[0134] Experimental Example 1

[0135] The test soil was selected as paddy soil developed from gray clay, used for year-round rice cultivation. The basic properties of the topsoil (0–25 cm) before the experiment were: total nitrogen 1.25 g / kg, available phosphorus 32.93 mg / kg, available potassium 113.6 mg / kg, pH 5.08, exchangeable acid 3.65 cmol / kg, exchangeable aluminum 1.55 cmol / kg, and base saturation 34.87%. The test soil was located in Babao Town, Qiyang City, Hunan Province. The experiment included 3 controls and 6 treatments, with the 6 treatments corresponding to the conditioner products in Examples 1–6, respectively. A completely randomized block design was used, with 3 replicates and average values ​​recorded in the table. Each treatment area was 30 m². 2 (Length 6m × Width 5m). During the experiment, all treatments were treated with the same compound fertilizer (nitrogen, phosphorus, potassium 15-15-15) at 50 kg / mu, and urea top dressing at 15 kg / mu during the greening stage. Lime was applied at 150 kg / mu. Rice was sown on March 23, 2024, transplanted on April 24, and harvested on July 24. The actual yield of each plot after harvest was also recorded (kg·30m³). -2 ).

[0136] Table 1. Rice paddy yield and representative soil indicators.

[0137]

[0138] Experimental Example 2

[0139] The test soil was selected from sloping farmland developed from red soil parent material, and hybrid maize was planted. The basic properties of the topsoil layer (0–25 cm) before the experiment were: total nitrogen 0.62 g / kg, available phosphorus 3.80 mg / kg, available potassium 64.33 mg / kg, pH = 4.59, exchangeable acid 17.83 cmol / kg, exchangeable aluminum 6.07 cmol / kg, and base saturation 10.19%. The test soil was located in Wenfu Town, Qiyang City, Hunan Province. The experiment included 3 controls and 4 treatments, corresponding to the conditioner products in Examples 1–4. A completely randomized block design was used, with 3 replicates and average values ​​recorded in the table. Each treatment area was 10 m². 2 (Length 4m × Width 2.5m). During the experiment, the same compound fertilizer (nitrogen, phosphorus, potassium 15-15-15) was applied at 50 kg / mu to different treatments. The lime application rate was 150 kg / mu. Rice was sown on April 20, 2024, and harvested on August 15. The actual yield of the plot after harvest was also checked (kg·m²). -2 ).

[0140] Table 2. Data on maize experimental field yield and representative soil indicators.

[0141]

[0142] As shown in Table 1-2, long-term application of nitrogen, phosphorus, and potassium fertilizer (NPK) leads to a decrease in soil pH and an increase in exchangeable acidity. However, the application of NPK fertilizer combined with lime can effectively increase soil pH and significantly reduce exchangeable acidity. Specifically, after applying lime, the soil pH increases and the exchangeable acidity decreases significantly.

[0143] The product of this invention contains a richer and more balanced blend of essential and beneficial elements than lime, with a well-balanced composition including silicon, calcium, and magnesium, and exhibits high acid-regulating efficiency. Treatments 1, 2, and 4 showed significant increases in pH and yield compared to lime application. Treatments 1 and 2 were more effective than lime application in reducing soil acidity and increasing base saturation. Based on experimental results, treatment 1 showed the best performance, followed by treatment 2, while treatment 6 demonstrated superior effectiveness in reducing soil exchangeable acid and exchangeable aluminum, and increasing base saturation.

[0144] Although lime can quickly and efficiently raise soil pH, excessive lime may lead to soil compaction and the risk of seedling burn. Calcium ions can also combine with phosphates, potassium, magnesium, and other minerals in the soil to form insoluble substances, reducing nutrient utilization. The soil conditioner prepared in this invention is not only superior to the lime control in regulating pH, but also avoids the destructive effects of lime on soil composition and ecology. The humic acid in the conditioner also stimulates crop growth, resulting in better growth and development of rice and corn plants. Therefore, the conditioner prepared in this invention is a green and environmentally friendly product.

[0145] Targeting the main obstacles of acidic soils, this application develops a new acid-resistant and aluminum-controlling micro / nano composite mineral conditioner by selecting nutrient-rich mineral materials, screening formulations, and optimizing product performance. This conditioner has the following characteristics:

[0146] Significantly improving the activity of conditioner products, the mechanical activation modification technology enhances mineral activity. During the ultrafine processing of minerals, some mechanical energy is absorbed through plastic deformation and defect generation, reaching a high-energy unstable state, thereby increasing their reactivity. Particle size affects the contact between the product and the soil. Through mechanical activation, the particle size is reduced to below 400 mesh, increasing the specific surface area and inducing mechanochemical effects such as lattice defects, structural distortion, and dislocation in mineral crystals. This transforms dense solid minerals into a micro-nano particle assembly with high surface activity. Furthermore, modification reduces particle agglomeration, increases dispersibility and contact with the soil, and improves the effectiveness of the components, thus achieving high efficiency.

[0147] This product gently regulates soil acidity. It uses mild, neutral to slightly alkaline raw materials (pH≤10), with a high proportion of alkaline substances and a large capacity to neutralize acidity, thus improving the buffering capacity against soil acidification. Under normal usage conditions, this new acid-blocking and aluminum-controlling micro-nano composite mineral conditioner increases the pH of acidic soil by 0.37-1.1 compared to conventional fertilization (control without conditioner).

[0148] It significantly reduces the content of activated aluminum. Pumice has a porous structure, which makes it more effective in controlling aluminum and passivating heavy metals. Mechanical activation improves the exchange and adsorption capacity of pumice. The conditioner comprehensively balances the nutrients in acidified soil and inhibits the soil acidification process of desilication and aluminum enrichment. Compared with conventional fertilization (control without conditioner), the exchangeable aluminum is reduced by 0.99-5.84 cmol / kg, inhibiting the formation of active aluminum in the soil. Some products have a porous structure, which significantly reduces the content of activated aluminum.

[0149] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner, characterized in that, Includes the following steps: Step (1): Pumice, wollastonite, serpentine, oyster shell, and phosphate rock are dried at 100-200℃ and pulverized to a fineness of 600 mesh or higher. Step (2): Mix the crushed pumice, wollastonite, serpentine and oyster shells, and ball mill them for 2-5 hours using a high-energy ball mill to obtain micro-nano mineral materials. Step (3): Mix humic acid and crushed phosphate rock and then ball mill it in a high-energy ball mill for 1-4 hours to obtain humic acid modified phosphate rock. Step (4): The micro-nano mineral materials obtained in steps (2)-(3) and humic acid modified phosphate rock are stirred evenly and granulated to obtain conditioner component A. Step (5): Spruce extract and betaine are mixed to obtain conditioner component B; Step (6): Mix component B with component A at a mass ratio of 0.01%-0.10% to obtain an acid-resistant and aluminum-controlling micro / nano composite mineral conditioner. The preparation method of the spruce extract is as follows: spruce leaves are dried and pulverized, mixed with ethanol at a material-to-liquid ratio of 1g:18ml, and then extracted at 70℃ for 2 hours each time, for a total of three operations. The extract is filtered and evaporated under reduced pressure at 40℃ to form crystals to obtain the spruce extract. By weight, the composition includes 10-40 parts pumice, 20-38 parts wollastonite, 25-35 parts serpentine, 29-60 parts oyster shell, 19-33 parts phosphorite, 5-20 parts humic acid, 1-8 parts spruce extract, and 0.5-2.5 parts betaine.

2. The acid-resistant and aluminum-controlling micro / nano composite mineral conditioner prepared by the method of claim 1.

3. The method of applying the conditioner according to claim 2, characterized in that, Apply 150 kg per acre to the soil.

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