Rhizosphere micro-area precision amendment based on ultra-high purity peat and preparation method and application thereof

Abstract

The application provides a rhizosphere microzone precision modifier based on super-high-purity peat and a preparation method and application thereof, and belongs to the technical field of soil improvement.The rhizosphere microzone precision modifier based on super-high-purity peat provided by the application takes super-high-purity peat with organic matter being greater than or equal to 90% as a core carrier, and through a four-dimensional synergistic mechanism of physical pore improvement, chemical buffer chelation, mineral nutrient supply and biological flora activation, a high-carbon, high-pore, nutrient-rich and biologically active micro rhizosphere ecological bank is constructed around the crop root system, the improvement material is limited in the rhizosphere microzone, one-time application and long-acting improvement are realized, the utilization efficiency of peat resources is greatly improved, and the defects of poor targeting, low utilization rate, insufficient microzone effect, high cost and easy rebound in the existing soil improvement technology are overcome.

Description

Technical Field

[0001] This invention relates to the field of soil improvement technology, and in particular to a rhizosphere micro-zone precision soil conditioner based on ultra-high purity peat, its preparation method, and its application. Background Technology

[0002] Currently, arable land soils generally face multiple challenges, including compaction, acidification / salinization, organic matter deficiency, and rhizosphere microecological imbalance, which severely restrict crop growth and the improvement of arable land quality. Traditional soil improvement methods, such as broadcasting and mixing across the entire area, have three major drawbacks: First, poor targeting and low utilization rate, with soil conditioners being applied over large areas outside the rhizosphere, failing to focus on the root system and resulting in significant loss of effective components; second, insufficient micro-area effect, making it difficult to form a stable nutrient and biological barrier in the millimeter-centimeter microenvironment of the root system; and third, high cost and easy rebound, with large dosages and high costs for nationwide application, and the improvement on soil physicochemical properties is not sustainable, with the improvement effect easily rebounding over time.

[0003] Peat, as a high-quality organic matrix, has advantages such as well-developed pore structure, mild physicochemical properties, and high humic acid content, making it an ideal raw material for soil improvement. However, the organic matter content of conventional peat products in the industry is mostly between 50% and 70%, which is relatively low in purity. Moreover, the application method is still mainly broadcasting across the entire area, which fails to achieve precise positioning of the rhizosphere micro-zones and cannot fully realize the improvement advantages of peat, making it difficult to overcome the existing technological bottlenecks.

[0004] To address the aforementioned issues, there is an urgent need to develop a technical solution that uses high-purity peat as its core, enables precise positioning of rhizosphere micro-zones, achieves long-term soil improvement through multi-dimensional synergistic effects, and enhances the utilization efficiency of peat resources, thereby overcoming many shortcomings of existing improvement technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a rhizosphere micro-area precision amendment based on ultra-high purity peat, its preparation method and application. The rhizosphere micro-area precision amendment based on ultra-high purity peat provided by this invention is suitable for rhizosphere micro-areas, achieving long-term improvement with one application, greatly improving the utilization efficiency of peat resources, and overcoming the defects of existing soil improvement technologies such as poor targeting, low utilization rate, insufficient micro-area effect, high cost and easy rebound.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a rhizosphere micro-area precision conditioner based on ultra-high purity peat, which is prepared by means of the following raw materials in parts by weight: 60-80 parts ultra-high purity peat, 5-10 parts expanded vermiculite, 3-8 parts diatomaceous earth, 2-5 parts sodium humate, 0.5-2 parts EDTA-2Na, 1-3 parts calcium carbonate / sodium bicarbonate, 1-4 parts potassium dihydrogen phosphate, 0.5-2 parts magnesium sulfate, 0.1-0.5 parts borax, 0.1-0.3 parts zinc sulfate, 1-3 parts compound microbial agent, and 0.5-1.5 parts seaweed extract.

[0007] Preferably, the ultra-high purity peat has an organic matter content of ≥90wt%, an average particle size of 100~200 mesh, a porosity of ≥75%, a humic acid content of ≥45wt%, and a pH value of 5.5~7.0.

[0008] Preferably, the compound microbial agent comprises Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi, and the effective viable count in the compound microbial agent is ≥2.0 × 10⁻⁶. 9 cfu / g.

[0009] Preferably, the expanded vermiculite has an average particle size of 80-120 mesh and an expansion ratio of ≥20 times; the diatomaceous earth has an average particle size of 120-150 mesh and a specific surface area of ​​≥200 m². 2 / g.

[0010] Preferably, the purity of the sodium humate is ≥90%, the purity of EDTA-2Na is ≥99%, and the purity of the seaweed extract is ≥80%.

[0011] This invention also provides a method for preparing the rhizosphere micro-region precision amendment based on ultra-high purity peat as described in the above technical solution, characterized by comprising the following steps: (1) Mix ultra-high purity peat, expanded vermiculite and diatomaceous earth to obtain a mixed matrix; (2) Add sodium humate, EDTA-2Na and calcium carbonate / sodium bicarbonate to the mixed matrix obtained in step (1) to carry out a chelation reaction to obtain a chelated product; (3) Add potassium dihydrogen phosphate, magnesium sulfate, borax and zinc sulfate to the chelate obtained in step (2) for the first mixing treatment, then add compound microbial agent and seaweed extract, and perform the second mixing treatment and post-treatment in sequence to obtain a rhizosphere micro-area precision improver based on ultra-high purity peat.

[0012] Preferably, the temperature of the chelation reaction in step (2) is 35~45℃, and the time of the chelation reaction is 60~90min.

[0013] Preferably, the post-processing in step (3) includes: cooling the product of the second mixing treatment to room temperature and storing it in an environment of 15~25°C and relative humidity ≤60%.

[0014] The present invention also provides a method for applying the rhizosphere micro-zone precision amendment based on ultra-high purity peat as described in the above technical solution. The rhizosphere micro-zone precision amendment based on ultra-high purity peat is applied in holes or trenches to achieve precise maintenance and immediate protection of the root system.

[0015] Preferably, the application rate of the rhizosphere micro-zone precision amendment based on ultra-high purity peat is as follows: 170-210 kg per mu for slightly degraded soil; 210-280 kg per mu for moderately degraded soil; and 280-350 kg per mu for severely degraded soil.

[0016] Compared with the prior art, the present invention has the following significant advantages: This invention provides a rhizosphere micro-zone precision soil conditioner based on ultra-high purity peat. Using ultra-high purity peat with ≥90% organic matter as the core carrier, it overcomes the limitation of low purity in conventional peat products. It innovatively adopts a rhizosphere micro-zone targeted application mode, replacing traditional whole-area broadcasting and whole-layer mixing, achieving precise positioning of the conditioner and solving the core defects of poor targeting and low utilization rate in existing technologies. This is fundamentally different from existing peat improvement technologies. The conditioner provided by this invention is not a superposition of single improvement effects, but rather a synergistic effect across four dimensions—physical, chemical, mineral, and biological—to form a stable, high-carbon, high-porosity, nutrient-rich, and biologically active micro-ecological reservoir in the rhizosphere micro-zone. This achieves simultaneous improvement of soil physicochemical properties and the micro-ecological environment, overcoming the bottleneck of insufficient micro-zone effects in existing technologies. Furthermore, the improvement effect is long-lasting and avoids rebound. This invention confines the conditioner to the rhizosphere micro-zone. The active ingredients act directly on the crop roots, increasing utilization by more than 60% compared to traditional full-area application. No large-scale application is required; the dosage per acre is only 30%-50% of traditional soil conditioners, significantly reducing application costs and peat resource consumption, achieving efficient peat resource utilization. This invention allows for adjustment of the chemical buffer chelating agent ratio according to different types of soil acidification and salinization, making it suitable for various types of degraded arable land (compacted, acidified, salinized, lacking organic matter, rhizosphere microecological imbalance, etc.) and compatible with various vegetables and crops. All raw materials used in this invention are free of heavy metal pollution, and the compound microbial agent can promote soil ecological restoration, reduce the use of chemical fertilizers and pesticides, and lower environmental pollution. The conditioner preparation process uses ambient and low-temperature processes, resulting in low energy consumption and no harmful gas emissions, meeting the needs of green agricultural development. Simultaneously, the chemical buffer chelating system can reduce soil heavy metal activity and improve the quality of agricultural products. Attached Figure Description

[0017] Figure 1This is a flowchart illustrating the preparation process of the rhizosphere micro-region precision amendment based on ultra-high purity peat in this invention. Detailed Implementation

[0018] This invention provides a rhizosphere micro-area precision conditioner based on ultra-high purity peat, which is prepared by means of the following raw materials in parts by weight: 60-80 parts ultra-high purity peat, 5-10 parts expanded vermiculite, 3-8 parts diatomaceous earth, 2-5 parts sodium humate, 0.5-2 parts EDTA-2Na, 1-3 parts calcium carbonate / sodium bicarbonate, 1-4 parts potassium dihydrogen phosphate, 0.5-2 parts magnesium sulfate, 0.1-0.5 parts borax, 0.1-0.3 parts zinc sulfate, 1-3 parts compound microbial agent, and 0.5-1.5 parts seaweed extract.

[0019] In this invention, the ultra-high purity peat preferably has an organic matter content of ≥90wt%, an average particle size of 100-200 mesh, a porosity of ≥75%, a humic acid content of ≥45wt%, and a pH value of 5.5-7.0. Preferably, the ultra-high purity peat is free of heavy metal contamination; the ultra-high purity peat contains ≤0.5mg / kg lead, ≤0.05mg / kg cadmium, and ≤0.01mg / kg mercury. This invention utilizes ultra-high purity peat as a core carrier, which not only directly replenishes soil organic matter and improves the soil carbon pool structure, but its well-developed porous structure also provides a carrier for rhizosphere microbial colonization. Simultaneously, it adsorbs and fixes other effective components in the amendment, reducing nutrient loss and providing an optimal growth environment for root development.

[0020] In this invention, the composite microbial agent preferably comprises Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi. In this invention, the preferred mass ratio of Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi is 2:1:1. In this invention, the effective viable count in the composite microbial agent is preferably ≥2.0 × 10⁻⁶. 9 cfu / g. In this invention, the effective viable count of Bacillus subtilis is ≥2.0 × 10⁻⁶. 9 cfu / g; the effective viable count of the phosphate-solubilizing bacteria is ≥1.0×10⁻⁶. 9 cfu / g; the effective viable count of the arbuscular mycorrhizal fungi is ≥1.0×10⁻⁶. 6CFU / g. In this invention, Bacillus subtilis, as the dominant strain, can rapidly colonize and multiply in the rhizosphere microzone, forming a dominant bacterial community that inhibits the growth and reproduction of harmful pathogens such as Fusarium and Rhizoctonia solani in the soil, reducing the occurrence of crop root diseases. Simultaneously, it secretes various enzymes such as proteases and cellulases to decompose recalcitrant organic matter in the soil, converting it into small-molecule nutrients that can be absorbed and utilized by crops, replenishing soil organic matter, improving soil aggregate structure, and enhancing soil permeability. Furthermore, its metabolites can promote crop root growth and enhance crop resistance (drought resistance, salinity resistance, and disease and pest resistance). In this invention, phosphate-solubilizing bacteria can decompose insoluble phosphorus (such as calcium phosphate and iron phosphate) in the soil into soluble phosphorus, increasing the available phosphorus content in the soil, compensating for soil phosphorus deficiency, and promoting the absorption and utilization of phosphorus by crop roots. In synergy with potassium dihydrogen phosphate, it further enhances the mineral nutrient supply effect, providing sufficient phosphorus source for crop growth and microbial reproduction. In this invention, arbuscular mycorrhizal fungi can form a symbiotic relationship with crop roots, extending to deeper soil layers through hyphal networks, expanding the absorption range of crop roots, and significantly improving the crop's absorption and utilization of nutrients such as water, phosphorus, zinc, and copper in the soil, especially enhancing the crop's absorption of insoluble phosphorus, and synergistically strengthening phosphorus supply with phosphate-solubilizing bacteria. At the same time, the hyphae can secrete polysaccharides, promoting the formation of soil aggregates, improving soil physicochemical properties, and enhancing soil water and fertilizer retention capacity. In addition, arbuscular mycorrhizal fungi can also activate the crop's own defense system, improve crop resistance (drought resistance, salt and alkali resistance, heavy metal stress resistance), and provide colonization sites for other beneficial microorganisms in the rhizosphere, synergistically optimizing the rhizosphere micro-ecological environment. This invention utilizes a specific mass ratio of Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi to achieve synergistic and complementary effects. Activated by seaweed extract, it rapidly forms a stable and active community of beneficial microorganisms (fungi) in the rhizosphere, constructing a biologically active rhizosphere microecological pool. This, in conjunction with other components, achieves long-term improvement of the soil microecology, while simultaneously enhancing crop stress resistance and nutrient absorption efficiency, thus contributing to the sustainability of the improvement effect. In this invention, the compound microbial agent is preferably refrigerated at 4°C for 1.5 hours before use. Refrigerating the compound microbial agent activates the activity of the bacterial strains and fungal spores, facilitating their better performance.

[0021] In this invention, the average particle size of the expanded vermiculite is preferably 80-120 mesh, and the expansion ratio of the expanded vermiculite is preferably ≥20 times; the average particle size of the diatomaceous earth is preferably 120-150 mesh, and the specific surface area of ​​the diatomaceous earth is preferably ≥200 m². 2 / g. This invention utilizes expanded vermiculite and diatomaceous earth as physical pore conditioners, which synergistically work with the pore structure of ultra-high purity peat to break up soil compaction, further optimize the pore structure of the rhizosphere microzone, improve soil permeability and water retention, and provide a relaxed physical environment for crop root extension; at the same time, it enhances the adsorption and fixation capacity of the conditioner for other effective components, reduces nutrient leaching loss, and provides a suitable physical space for rhizosphere microbial colonization and activity.

[0022] This invention adds specific amounts of potassium dihydrogen phosphate, magnesium sulfate, borax, and zinc sulfate as mineral nutrient supplements to precisely replenish the macro- and micronutrients required for crop root growth, preventing nutrient imbalances and meeting the needs of crops throughout their entire growth cycle. Potassium dihydrogen phosphate, as a core macronutrient component, replenishes the phosphorus and potassium elements needed for crop growth. Phosphorus promotes root development, flower bud differentiation, and fruit ripening, enhancing crop resistance (drought, cold, and pest resistance). Potassium promotes the translocation of photosynthetic products, improving crop quality and yield, while also providing phosphorus support for the growth and reproduction of rhizosphere microorganisms. Magnesium sulfate replenishes the essential magnesium and sulfur elements. Magnesium is a core component of chlorophyll, promoting efficient photosynthesis and preventing yellowing of crops. Simultaneously, sulfur participates in crop enzymatic reactions, regulates cell osmotic pressure, and can participate in crop protein synthesis, enhancing crop stress resistance. Borax supplements the essential trace element boron, which can promote pollen germination and pollen tube elongation, increase crop fruit setting rate, promote root growth, enhance crop calcium absorption and utilization, and prevent problems such as flower and fruit drop and deformed fruit. Zinc sulfate supplements the essential trace element zinc, which is a component of many crop enzymes, can promote crop growth and development, improve photosynthetic efficiency, prevent zinc deficiency chlorosis and stunted growth, enhance crop stress resistance, promote rhizosphere microbial activity, and synergistically support the mineral nutrient supply dimension of the four-dimensional synergistic improvement mechanism with other components, ensuring the formation of a nutrient-rich rhizosphere microecological pool.

[0023] In this invention, the purity of sodium humate is preferably ≥90%, and the purity of EDTA-2Na is preferably ≥99%. This invention uses a certain amount of sodium humate, EDTA-2Na, and calcium carbonate / sodium bicarbonate as buffer chelating agents. During the preparation process, a chelation reaction occurs. EDTA-2Na and sodium humate work synergistically, and the chelating groups in its molecular structure combine with metal ions (such as potassium, magnesium, and zinc) in the mineral nutrient supplements (i.e., potassium dihydrogen phosphate, magnesium sulfate, borax, and zinc sulfate) to form stable chelates. Simultaneously, calcium carbonate / sodium bicarbonate slowly dissolves, adjusting the pH of the mixed matrix to a suitable range of 5.5-7.0, ultimately fusing with the physically mixed matrix to form a stable chemical buffer matrix. No harmful byproducts are generated during this process. In the amendment described in this invention, the buffer chelating agent can continuously regulate the pH of the rhizosphere microzone. For acidified soils, calcium carbonate neutralizes soil hydrogen ions. This process alleviates acidification; for saline-alkali soils, sodium bicarbonate regulates soil osmotic pressure, reduces the content of soluble salts in the soil, and improves salt-alkali stress; simultaneously, EDTA-2Na and sodium humate synergistically chelate free lead, cadmium, and other heavy metal ions in the soil to form stable, water-insoluble chelates, reducing the harm of heavy metals to crop roots and decreasing the migration of heavy metals in the soil; furthermore, sodium humate can form stable chelates with mineral nutrients, preventing nutrient leaching and loss, while promoting the absorption and utilization of nutrients by crop roots; the buffering chelating agent can form a stable chemical buffer system to resist the influence of external environmental factors (such as watering and fertilization) on the pH value of the rhizosphere microzone, providing a stable chemical environment for crop root growth and microbial colonization, and synergistically achieving long-term stability of the rhizosphere microecological pool with other components.

[0024] In this invention, the purity of the seaweed extract is preferably ≥80%. The seaweed extract in this invention is rich in seaweed polysaccharides and amino acids, which are used to activate rhizosphere microbial activity, promote microbial colonization and reproduction, and improve the rhizosphere microecological environment.

[0025] This invention also provides a method for preparing the rhizosphere micro-region precision amendment based on ultra-high purity peat as described in the above technical solution, characterized by comprising the following steps: (1) Mix ultra-high purity peat, expanded vermiculite and diatomaceous earth to obtain a mixed matrix; (2) Add sodium humate, EDTA-2Na and calcium carbonate / sodium bicarbonate to the mixed matrix obtained in step (1) to carry out a chelation reaction to obtain a chelated product; (3) Add potassium dihydrogen phosphate, magnesium sulfate, borax and zinc sulfate to the chelate obtained in step (2) for the first mixing treatment, then add compound microbial agent and seaweed extract, and perform the second mixing treatment and post-treatment in sequence to obtain a rhizosphere micro-area precision improver based on ultra-high purity peat.

[0026] Unless otherwise specified, all raw materials used in this invention are commercially available products in the art.

[0027] In this invention, the ultra-high purity peat is preferably pretreated before use; the pretreatment preferably includes: drying the ultra-high purity peat in a constant temperature drying oven at 60~70℃ for 8~12 hours until the water content is ≤10wt%, followed by pulverizing and passing it through a 100~200 mesh sieve to remove impurities. In this invention, the mixing method of the ultra-high purity peat, expanded vermiculite and diatomaceous earth is preferably to place the ultra-high purity peat, expanded vermiculite and diatomaceous earth in a mixer and stir at a speed of 150~200 r / min at room temperature for 30~40 minutes.

[0028] In this invention, the preferred temperature for the chelation reaction is 35-45°C, and the preferred reaction time is 60-90 min. During the chelation reaction, the mixture is stirred every 15 min.

[0029] In this invention, the preferred time for the first mixing treatment is 20-30 minutes. In this invention, the preferred time for the second mixing treatment is 20-30 minutes; the temperature for the second mixing treatment is room temperature. In this invention, the post-treatment includes: cooling the product of the second mixing treatment to room temperature and storing it in an environment of 15-25°C and relative humidity ≤60%.

[0030] The present invention also provides a method for applying the rhizosphere micro-zone precision amendment based on ultra-high purity peat as described in the above technical solution. The rhizosphere micro-zone precision amendment based on ultra-high purity peat is applied in holes or trenches to achieve precise maintenance and immediate protection of the root system.

[0031] In this invention, the preferred method of planting in holes includes: (1) digging holes: digging planting holes at the predetermined planting point of the crop, with a diameter of approximately 10 cm and a depth of approximately 10 cm; (2) applying and protecting the holes: filling the holes with a rhizosphere micro-zone precision improver based on ultra-high purity peat, and planting vegetable seedlings in the rhizosphere micro-zone precision improver, so that the rhizosphere micro-zone precision improver forms a protective microenvironment around the seedling roots, thereby achieving immediate protection of the root system; (3) watering: watering thoroughly after planting, with a watering volume of 10-15 m³ per acre. 3 In this invention, the trench application method preferably includes: (1) trenching: digging trenches with a depth of 5-25cm and a width of 5-8cm; (2) trench application and protection: uniformly applying the rhizosphere micro-area precision improver based on ultra-high purity peat into the trench, placing vegetable seedlings in the rhizosphere micro-area precision improver in the trench, using the improver to construct a rhizosphere barrier, and performing precise wheat root maintenance; (3) watering: watering thoroughly after transplanting, with a watering volume of 10-15m³ per acre. 3 .

[0032] In this invention, the preferred application rate of the rhizosphere micro-zone precision conditioner based on ultra-high purity peat is as follows: 170-210 kg / mu for mildly degraded soil; 210-280 kg / mu for moderately degraded soil; and 280-350 kg / mu for severely degraded soil. The conditioner provided by this invention ensures that seedling roots are exposed to a high-quality microenvironment during the seedling stage, promotes rapid recovery and explosive root growth after transplanting, and continuously maintains a healthy rhizosphere microecology during the growing season.

[0033] This invention provides a rhizosphere micro-zone precision soil conditioner based on ultra-high purity peat. Using ultra-high purity peat with ≥90% organic matter as the core carrier, it significantly increases soil porosity and reduces bulk density compared to conventional industry products, resulting in a substantial increase in rhizosphere carbon reserves. It eliminates waste across the entire soil surface, focusing on the rhizosphere micro-zone, significantly improving fertilizer utilization and reducing overall planting costs per acre. It is precise, efficient, and cost-effective. The conditioner's formula has no chemical residues and utilizes the high organic matter adsorption properties to passivate heavy metals, making it applicable to high-end facility agriculture and green organic planting bases. The compound microbial agent rapidly proliferates in high-carbon environments, significantly inhibiting harmful pathogens such as Fusarium and enhancing crop drought and salt tolerance. This invention utilizes a four-dimensional synergistic mechanism of physical porosity improvement, chemical buffering and chelation, mineral nutrient supply, and biological microbial activation to construct a high-carbon, high-porosity, nutrient-rich, and biologically active micro-rhizosphere ecological pool around crop roots. This confines the amendment material to the rhizosphere micro-zone, achieving long-term improvement with a single application, significantly improving the utilization efficiency of peat resources, and overcoming the shortcomings of existing soil amendment technologies such as poor targeting, low utilization rate, insufficient micro-zone effect, high cost, and easy rebound.

[0034] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0035] Unless otherwise specified, all experiments were repeated three times, and the results are expressed as averages.

[0036] Example 1 A rhizosphere micro-area precision amendment based on ultra-high purity peat, prepared by weight from the following raw materials: 65 parts ultra-high purity peat (imported from Finland, 92% organic matter, 150 mesh), 7 parts expanded vermiculite (100 mesh, expansion ratio 25 times), and diatomaceous earth (130 mesh, specific surface area 220 m²). 25 parts of sodium humate (92% purity), 3 parts of sodium humate (99% purity), 1 part of EDTA-2Na (99% purity), 2 parts of calcium carbonate, 2 parts of potassium dihydrogen phosphate, 1 part of magnesium sulfate, 0.3 parts of borax, 0.2 parts of zinc sulfate, and a compound microbial agent (composed of Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi in a mass ratio of 2:1:1, with an effective viable count of Bacillus subtilis ≥2.0×10⁻⁶). 9 CFU / g, effective viable count of phosphate-solubilizing bacteria ≥1.0×10⁻⁶ 9 CFU / g, effective spore count of arbuscular mycorrhizal fungi ≥1.0×10⁻⁶ 6 2 portions of seaweed extract (85% purity) with total activity meeting the standard (each g) and 1 portion of seaweed extract.

[0037] The above-mentioned method for preparing rhizosphere micro-region precision amendments based on ultra-high purity peat: (1) Dry the ultra-high purity peat at 65℃ for 10h, control the moisture content at 8%, crush it through a 150-mesh sieve, crush the expanded vermiculite and diatomite through a sieve, and then put the ultra-high purity peat, expanded vermiculite and diatomite into a three-dimensional mixer and mix them at 180r / min and room temperature for 35min to obtain a mixed matrix. (2) Add sodium humate, EDTA-2Na and calcium carbonate to the mixed matrix obtained in step (1), adjust the rotation speed to 220 r / min, raise the temperature to 38°C, carry out the chelation reaction for 75 min, stir once every 15 min, and obtain the chelation product. (3) Add potassium dihydrogen phosphate, magnesium sulfate, borax and zinc sulfate to the chelate obtained in step (2), perform the first mixing treatment for 25 min, cool down to 28°C, add compound microbial agent and seaweed extract, and continue the second mixing treatment for 25 min to ensure that the fungal spores are evenly dispersed. Cool to room temperature, test the moisture and microbial activity, and after passing the test, vacuum pack and store in a cool and dry place to obtain the rhizosphere micro-area precision improver based on ultra-high purity peat. The compound microbial agent should be refrigerated at 4°C for 1.5 hours before use to activate the activity of the strains and fungal spores. Application Example 1 The rhizosphere micro-zone precision conditioner based on ultra-high purity peat from Example 1 was applied to watermelon planting areas on slightly degraded soil. 220 kg per acre was applied using the hole application method. The specific steps were as follows: (1) Digging holes: Dig planting holes at the designated planting points for the crops, with a diameter of approximately 10cm and a depth of approximately 10cm; (2) Applying and protecting the holes: Fill the holes with the rhizosphere micro-zone precision improver based on ultra-high purity peat from Example 1, and plant the watermelon seedlings in the rhizosphere micro-zone precision improver, so that the rhizosphere micro-zone precision improver forms a protective microenvironment around the seedling roots, achieving immediate protection of the root system, and then cover and compact; (3) Watering: Water thoroughly after planting, with a watering volume of 12m³ per acre. 3 The watermelon will then be maintained using standard methods.

[0038] Comparative Example 1 A control area was set up within the watermelon planting area in Application Example 1, and watermelons were sown and maintained using conventional methods.

[0039] Compared with Comparative Example 1, in Application Example 1, one month after application, soil compaction was alleviated and porosity increased by 20%; the symbiotic rate between arbuscular mycorrhizal fungi and watermelon roots reached over 68%, effectively extending the watermelon root absorption network and significantly enhancing root vitality; no additional organic amendment was needed throughout the growing season; soil organic matter content increased by 18%; watermelon fruit setting rate increased by 11%; individual fruits were uniformly enlarged and shaped; sweetness and soluble solids were significantly improved; yield per acre increased by 9%; and the plant's drought resistance, stress resistance, and disease resistance were significantly enhanced.

[0040] Example 2 A rhizosphere micro-area precision amendment based on ultra-high purity peat, prepared by weight from the following raw materials: 70 parts ultra-high purity peat (imported from Canada, 91% organic matter, 120 mesh), 8 parts expanded vermiculite (80 mesh, expansion ratio 22 times), and diatomaceous earth (120 mesh, specific surface area 210 m²). 2 6 parts of sodium humate (90% purity), 4 parts of sodium humate (99% purity), 1.5 parts of EDTA-2Na (99% purity), 2.5 parts of calcium carbonate, 3 parts of potassium dihydrogen phosphate, 1.5 parts of magnesium sulfate, 0.4 parts of borax, 0.25 parts of zinc sulfate, and a compound microbial agent (composed of Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi in a mass ratio of 2:1:1, with an effective viable count of Bacillus subtilis ≥2.0×10⁻⁶). 9 CFU / g, effective viable count of phosphate-solubilizing bacteria ≥1.0×10⁻⁶ 9 CFU / g, effective spore count of arbuscular mycorrhizal fungi ≥1.0×10⁻⁶ 6 2.5 parts (each g, total activity meets standard) and 1.2 parts seaweed extract (82% purity).

[0041] The above-mentioned modifier was prepared according to the method of Example 1, except that the mixing time for preparing the mixed matrix was 38 min, the temperature of the chelation reaction was 37°C, the chelation reaction time was 80 min, the second mixing treatment time was 28 min, and the remaining steps were the same.

[0042] Application Example 2 The rhizosphere micro-zone precision conditioner based on ultra-high purity peat from Example 2 was applied to a tomato planting area with moderately degraded soil (slightly acidified). 220 kg per acre was applied using the hole application method. The specific steps were as follows: (1) Digging holes: Dig planting holes at the designated planting points for the crops, with a diameter of approximately 10cm and a depth of approximately 10cm; (2) Applying and protecting the holes: Fill the holes with the rhizosphere micro-zone precision improver based on ultra-high purity peat from Example 2, and plant the tomato seedlings in the rhizosphere micro-zone precision improver, so that the rhizosphere micro-zone precision improver forms a protective microenvironment around the seedling roots, achieving immediate protection of the root system, and then cover and compact; (3) Watering: Water thoroughly after planting, with a water volume of 13m³ per acre. 3 Then maintain the tomatoes using the usual methods.

[0043] Comparative Example 2 A control area was set up within the tomato planting area in Application Example 2, and tomatoes were planted and maintained using conventional methods.

[0044] Compared with Comparative Example 2, in Application Example 2, the soil pH value was adjusted from 5.2 to 6.3 two months after application, and the acidification phenomenon was alleviated; the symbiotic rate between arbuscular mycorrhizal fungi and tomato roots reached more than 70%, the number of rhizosphere microorganisms increased by 35%, and the incidence of tomato root diseases decreased by 20%; the tomato fruit setting rate increased by 13%, the single fruit weight increased by 8%, the quality was significantly improved, the improvement effect lasted until the end of the tomato harvest period, and the tomato's resistance to salt and alkali stress was enhanced.

[0045] Example 3 A rhizosphere micro-area precision conditioner based on ultra-high purity peat, prepared by weight from the following raw materials: 75 parts ultra-high purity peat (imported from Finland, 93% organic matter, 180 mesh), 9 parts expanded vermiculite (120 mesh, expansion ratio 28 times), and diatomaceous earth (150 mesh, specific surface area 230 m²). 2 7 parts ( / g) of sodium humate (93% purity), 5 parts of sodium humate, 2 parts of EDTA-2Na (99% purity), 3 parts of sodium bicarbonate, 4 parts of potassium dihydrogen phosphate, 2 parts of magnesium sulfate, 0.5 parts of borax, 0.3 parts of zinc sulfate, and a compound microbial agent (composed of Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi in a mass ratio of 2:1:1, with an effective viable count of Bacillus subtilis ≥2.0×10⁻⁶). 9 CFU / g, effective viable count of phosphate-solubilizing bacteria ≥1.0×10⁻⁶ 9 CFU / g, effective spore count of arbuscular mycorrhizal fungi ≥1.0×10⁻⁶ 6 3 parts of seaweed extract (88% purity) with total activity meeting the standard (each g) and 1.5 parts of seaweed extract (88% purity).

[0046] The modifier was prepared according to the method of Example 1, except that the rotation speed for preparing the mixed matrix was 190 r / min, the mixing time for preparing the mixed matrix was 40 min, the temperature for the chelation reaction was 39°C, the chelation reaction time was 90 min, the second mixing treatment time was 30 min, and the remaining steps were the same.

[0047] Application Example 3 The rhizosphere micro-zone precision soil conditioner based on ultra-high purity peat from Example 3 was applied to cotton-growing areas with severely degraded soil (severe salinization). 280 kg per acre was applied using the furrow application method. The specific steps were as follows: (1) Trenching: Dig trenches 12cm deep and 8cm wide; (2) Application and protection: Apply the rhizosphere micro-area precision conditioner based on ultra-high purity peat evenly into the trench, place the cotton seedlings in the rhizosphere micro-area precision conditioner in the trench, and use the conditioner to build a rhizosphere barrier to precisely maintain the root system; (3) Irrigation: Irrigate thoroughly after transplanting, with an irrigation volume of 15m³ per mu. 3 The cotton will then be maintained using standard methods.

[0048] Comparative Example 3 A control area was set up within the cotton-growing area in Application Example 3, and cotton was sown and maintained using conventional methods.

[0049] Compared with Comparative Example 3, in Application Example 3, after 3 months of application, the soil soluble salt content (EC value) decreased by 55%, and the degree of salinization was significantly alleviated; soil compaction was completely improved, and porosity increased by 30%; the symbiotic rate between arbuscular mycorrhizal fungi and cotton roots reached more than 75%, the cotton root system was well developed, the absorption range was expanded, the stress resistance was enhanced, the incidence of wilt disease decreased by 25%, the yield per mu increased by 15%, the improvement effect could be maintained for 2 growing seasons, and the cotton's resistance to heavy metal stress was significantly improved.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A rhizosphere micro-region precision amendment based on ultra-high purity peat, characterized in that, The product is prepared by weight of the following raw materials: 60-80 parts ultra-high purity peat, 5-10 parts expanded vermiculite, 3-8 parts diatomaceous earth, 2-5 parts sodium humate, 0.5-2 parts EDTA-2Na, 1-3 parts calcium carbonate / sodium bicarbonate, 1-4 parts potassium dihydrogen phosphate, 0.5-2 parts magnesium sulfate, 0.1-0.5 parts borax, 0.1-0.3 parts zinc sulfate, 1-3 parts compound microbial agent, and 0.5-1.5 parts seaweed extract.

2. The rhizosphere micro-region precision conditioner based on ultra-high purity peat according to claim 1, characterized in that, The ultra-high purity peat contains ≥90wt% organic matter, has an average particle size of 100~200 mesh, a porosity of ≥75%, a humic acid content of ≥45wt%, and a pH value of 5.5~7.

0.

3. The rhizosphere micro-region precision amendment based on ultra-high purity peat according to claim 1, characterized in that, The compound microbial agent contains Bacillus subtilis, phosphate-solubilizing bacteria, and arbuscular mycorrhizal fungi, and the effective viable count in the compound microbial agent is ≥2.0 × 10⁻⁶. 9 cfu / g.

4. The rhizosphere micro-region precision amendment according to claim 1, characterized in that, The expanded vermiculite has an average particle size of 80-120 mesh and an expansion ratio of ≥20 times; the diatomaceous earth has an average particle size of 120-150 mesh and a specific surface area of ​​≥200 m². 2 / g.

5. The rhizosphere micro-region precision amendment according to claim 1, characterized in that, The purity of the sodium humate is ≥90%, the purity of EDTA-2Na is ≥99%, and the purity of the seaweed extract is ≥80%.

6. A method for preparing a rhizosphere micro-region precision conditioner based on ultra-high purity peat as described in any one of claims 1 to 5, characterized in that, Includes the following steps: (1) Mix ultra-high purity peat, expanded vermiculite and diatomaceous earth to obtain a mixed matrix; (2) Add sodium humate, EDTA-2Na and calcium carbonate / sodium bicarbonate to the mixed matrix obtained in step (1) to carry out a chelation reaction to obtain a chelated product; (3) Add potassium dihydrogen phosphate, magnesium sulfate, borax and zinc sulfate to the chelate obtained in step (2) for the first mixing treatment, then add compound microbial agent and seaweed extract, and perform the second mixing treatment and post-treatment in sequence to obtain a rhizosphere micro-area precision improver based on ultra-high purity peat.

7. The preparation method according to claim 6, characterized in that, The chelation reaction in step (2) is carried out at a temperature of 35-45°C and for a time of 60-90 minutes.

8. The preparation method according to claim 6, characterized in that, The post-processing in step (3) includes: cooling the product of the second mixing treatment to room temperature and storing it in an environment of 15~25℃ and relative humidity ≤60%.

9. A method for applying the rhizosphere micro-region precision amendment based on ultra-high purity peat as described in any one of claims 1 to 5, characterized in that, The rhizosphere micro-zone precision amendment based on ultra-high purity peat can achieve precise maintenance and immediate protection of the root system through hole application or trench application.

10. The application method according to claim 9, characterized in that, The application rate of the rhizosphere micro-zone precision amendment based on ultra-high purity peat is as follows: slightly degraded soil: 170-210 kg per mu; moderately degraded soil: 210-280 kg per mu; severely degraded soil: 280-350 kg per mu.

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