Garden soil remediation fertilizer and preparation method thereof

Abstract

The invention relates to the technical field of garden ecological environment remediation, in particular to a garden soil remediation fertilizer and a preparation method thereof. The garden soil remediation fertilizer is prepared from the following components in parts by weight: 20 to 40 parts of decomposed organic fertilizer, 10 to 30 parts of plant source organic material, 10 to 20 parts of mineral conditioner, 10 to 20 parts of microbial nutrition activator and 10 to 20 parts of compound microbial agent. The garden soil remediation fertilizer has a good remediation effect on the soil environment, and the survival rate of green plants is greatly increased.

Description

Technical Field

[0001] This invention relates to the field of landscape ecological environment restoration technology, and in particular to a landscape soil remediation fertilizer and its preparation method. Background Technology

[0002] Garden soil remediation is fundamental to ensuring the healthy growth of garden plants and achieving aesthetic and ecological benefits. Simply put, the main reasons and purposes for garden soil remediation are as follows: addressing both inherent deficiencies and acquired imbalances in garden soil.

[0003] "Inherent deficiencies" refer to damage caused by engineering construction, specifically including severe compaction: During construction and landscaping, the crushing of soil by heavy machinery and trampling by people leads to severe soil compaction and a sharp decrease in porosity. This is like putting a "straight-fitting suit" on the soil, preventing roots from extending, hindering water and air circulation, and restricting microbial activity. Loss of topsoil: During construction, the originally fertile topsoil (topsoil) is often removed or mixed in, leaving behind deep, infertile subsoil, construction waste, or backfill soil with extremely low organic matter and nutrient content. Damage to soil structure: The naturally formed granular structure is destroyed, resulting in poor soil water and fertilizer retention capacity, making it prone to waterlogging or drought.

[0004] "Acquired imbalance" refers to improper maintenance and management, specifically including: nutrient imbalance: long-term use of chemical fertilizers leads to an excess of certain elements in the soil (such as salt accumulation) while other elements are deficient, causing soil acidification or salinization. Organic matter deficiency: fallen leaves and pruned branches are treated as garbage and removed, interrupting the natural material cycle, preventing the replenishment of soil organic matter, and causing soil fertility to decline year by year. Pollution and toxicity: improper use of pesticides and herbicides, or the accumulation of pollutants such as heavy metals from industry and transportation, are toxic to plants and soil organisms. Therefore, in order to address the above problems, it is necessary to develop a soil remediation fertilizer for gardens and its preparation method. Summary of the Invention

[0005] The first technical problem to be solved by this invention is to provide a garden soil remediation fertilizer that addresses the shortcomings of existing technologies, thereby improving the soil's repair efficiency and increasing the survival rate of green plants.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A garden soil remediation fertilizer comprises the following components by weight: 20-40 parts of well-rotted organic fertilizer, 10-30 parts of plant-derived organic materials, 10-20 parts of mineral conditioner, 10-20 parts of microbial nutrient activator, and 10-20 parts of compound microbial agent.

[0008] As a preferred technical solution, the garden soil remediation fertilizer comprises the following components by weight: 30 parts of decomposed organic fertilizer, 20 parts of plant-derived organic materials, 15 parts of mineral conditioner, 15 parts of microbial nutrient activator, and 15 parts of compound microbial agent.

[0009] As an improved technical solution, the decomposed organic fertilizer includes decomposed cow and sheep manure fertilizer, decomposed poultry manure fertilizer, and decomposed kitchen waste fertilizer; the decomposed cow and sheep manure fertilizer, decomposed poultry manure fertilizer, and decomposed kitchen waste fertilizer are mixed in a mass ratio of 1-3:1-2:0.5-1; the plant-derived organic materials include pine needle powder, straw powder, modified rice husk charcoal, and coconut coir; the pine needle powder, straw powder, modified rice husk charcoal, and coconut coir are mixed in a mass ratio of 1:1-3:1-2:0.5-1.

[0010] As an improved technical solution, the preparation method of the modified rice husk charcoal includes the following steps:

[0011] (1) The rice husks after impurity removal are heated to 500-600℃ at a heating rate of 5-10℃ / min under nitrogen protection. After treatment for 1-2 hours, they are cooled to room temperature. The collected rice husk charcoal is ground to obtain rice husk charcoal powder for use.

[0012] (2) Take the rice husk charcoal powder from step (1) and add it to a 1 mol / L FeCl3 solution at a ratio of 1:10-15. Stir for 6-12 hours and then age at 60-80℃ for 24 hours. The resulting mixture is ready for use.

[0013] (3) The mixture described in step (2) is dried at 105°C for 12 hours and then calcined in air at 300-350°C for 2 hours. After cooling to room temperature, it is ground to obtain modified rice husk charcoal.

[0014] As an improved technical solution, the mineral conditioning agent includes zeolite powder, maifanite powder and dolomite powder, and the zeolite powder, maifanite powder and dolomite powder are mixed in a mass ratio of 1-3:1-2:0.5-1; the microbial nutrient activator includes humic acid and chitin, and the humic acid and chitin are mixed in a mass ratio of 1-2:1.

[0015] As an improved technical solution, the composite microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus lentigines, and Bacillus megaterium, which are mixed in a mass ratio of 1-3:1-2:1-2:1-3.

[0016] As a preferred technical solution, the Bacillus subtilis, Bacillus licheniformis, Bacillus jellyoidis and Bacillus megaterium are mixed in a mass ratio of 3:3:3:2.

[0017] The second technical problem to be solved by the present invention is to provide a method for preparing garden soil remediation fertilizer in view of the shortcomings of the prior art. The garden soil remediation fertilizer obtained by the preparation method has a good remediation effect on the soil and greatly improves the survival rate of plants.

[0018] A method for preparing a garden soil remediation fertilizer, the method comprising the following process steps:

[0019] (1) Mix the pre-treated decomposed organic fertilizer, plant-derived organic materials and mineral conditioner according to the formula ratio and set aside.

[0020] (2) Add the microbial nutrient activator to step (1) according to the formula ratio, stir and mix, then add the compound microbial agent according to the formula ratio, continue to stir and mix, and pile it in a cool, ventilated and dark place for 24-48 hours to obtain garden soil remediation fertilizer.

[0021] After adopting the above technical solution, the beneficial effects of the present invention are:

[0022] This invention provides a superior soil remediation fertilizer for gardens, offering excellent soil structure restoration and physical property improvement: well-rotted organic fertilizer (a mixture of cow and sheep manure, poultry manure, and kitchen waste) provides abundant humus; a combination of plant-derived organic materials (pine needle powder, straw, and coconut coir) provides a long-lasting carbon source and physical framework; and modified rice husk charcoal has a well-developed porous structure. The combination of these three elements significantly increases soil organic matter, forming a stable granular structure that makes the soil loose, breathable, water-retentive, and fertilizer-retaining, effectively solving common garden soil problems such as compaction, waterlogging, and drought, and creating an ideal living environment for plant roots and microorganisms.

[0023] This invention provides a garden soil remediation fertilizer with strong passivation / adsorption capabilities for heavy metals and pollutants: modified rice husk charcoal (loaded with nano-iron oxide), whose surface nano-iron oxide exhibits strong specific adsorption and co-precipitation effects on heavy metals such as arsenic, cadmium, and lead; zeolite powder and maifanite powder possess ion exchange and adsorption capabilities; humic acid can also complex heavy metals. It effectively fixes various heavy metal ions in the soil, reduces their bioavailability and mobility, and decreases plant absorption, making it particularly suitable for urban garden soil remediation where construction waste and industrial residue pollution may exist.

[0024] This invention provides a comprehensive nutrient supply and activation system for garden soil remediation fertilizer: well-rotted organic fertilizer and kitchen waste fertilizer provide nitrogen, phosphorus, potassium, and various other nutrients. Dolomite powder (calcium, magnesium) and maifanite powder (various mineral elements) are also included. A compound microbial agent (Bacillus megaterium potassium-solubilizing and Bacillus megaterium phosphorus-solubilizing) converts fixed, unavailable phosphorus and potassium in the soil into available forms; nitrogen-fixing bacteria (with latent function) supplement nitrogen. A carrier for slow release: modified rice husk charcoal, zeolite, etc., can act as a nutrient "warehouse," reducing nutrient loss.

[0025] This invention provides a soil remediation fertilizer for gardens that promotes the reconstruction of a healthy microbial community and biological control: Preferred compound microbial agents (such as Bacillus subtilis and Bacillus licheniformis) are beneficial soil bacteria that can rapidly colonize. Microbial nutrient activators (humic acid and chitin) are highly efficient carbon sources and exciters; porous biochar and organic materials provide excellent "refuges" and breeding grounds for microorganisms. Chitin can induce systemic resistance in plants and stimulate the growth of beneficial actinomycetes. Bacillus subtilis and Bacillus licheniformis produce antibiotics and compete for space, effectively inhibiting pathogens such as Fusarium and Rhizoctonia. The healthy microbial community forms a protective barrier, enhancing the plant's resistance to drought, salinity, and diseases.

[0026] The garden soil remediation fertilizer of this invention has excellent soil chemical environment regulation: dolomite powder, as a mild alkaline mineral, can neutralize soil acidity; humic acid and organic acids can adjust the soil pH to a more suitable range; zeolite has pH buffering capacity. The mineral conditioner slightly adjusts acidic or alkalized soil towards neutrality, improves nutrient availability, and reduces obstacles such as aluminum toxicity.

[0027] In summary, the garden soil remediation fertilizer of this invention promotes the development of plant root systems, enhances water and nutrient absorption capacity, reduces diseases, increases growth hormones (such as IAA produced by fungicides), ensures sufficient nutrients, and reduces toxins. When used for the remediation of newly planted trees, flowers, or degraded lawns, it can significantly improve transplant survival rates, shorten the seedling recovery period, promote robust plant growth, and enhance landscape effects and ecological stability. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Example 1

[0030] A garden soil remediation fertilizer comprises the following components by weight: 20 parts of well-rotted organic fertilizer, 10 parts of plant-derived organic materials, 10 parts of mineral conditioner, 10 parts of microbial nutrient activator, and 10 parts of compound microbial agent.

[0031] The decomposed organic fertilizer includes decomposed cow and sheep manure, decomposed poultry manure, and decomposed kitchen waste; these are mixed in a mass ratio of 1:1:0.5. The plant-derived organic materials include pine needle powder, straw powder, modified rice husk charcoal, and coconut coir; these are mixed in a mass ratio of 1:1:1:0.5.

[0032] The preparation method of modified rice husk charcoal includes the following steps:

[0033] (1) The rice husks after impurity removal are heated to 500°C at a heating rate of 5°C / min under nitrogen protection. After treatment for 1 hour, they are cooled to room temperature. The collected rice husk charcoal is ground to obtain rice husk charcoal powder for use.

[0034] (2) Take the rice husk charcoal powder from step (1) and add it to a 1 mol / L FeCl3 solution at a ratio of 1:10. Stir for 6 hours and then age at 60°C for 24 hours. The resulting mixture is ready for use.

[0035] (3) The mixture described in step (2) is dried at 105°C for 12 hours and then calcined in air at 300°C for 2 hours. After cooling to room temperature, it is ground to obtain modified rice husk char (nano iron oxide supported rice husk biochar).

[0036] The mineral conditioning agents include zeolite powder, maifanite powder, and dolomite powder, which are mixed in a mass ratio of 1:1:0.5; the microbial nutrient activators include humic acid and chitin, which are mixed in a mass ratio of 1:1.

[0037] The compound microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus lentigines, and Bacillus megaterium, which are mixed in a mass ratio of 1:1:1:1.

[0038] The preparation method of garden soil remediation fertilizer includes the following technological steps:

[0039] (1) Mix the pre-treated decomposed organic fertilizer, plant-derived organic materials and mineral conditioner according to the formula ratio and set aside.

[0040] (2) Add the microbial nutrient activator to step (1) according to the formula ratio, stir and mix, then add the compound microbial agent according to the formula ratio, continue to stir and mix, and pile it up for 24 hours under cool, ventilated and dark conditions to obtain garden soil remediation fertilizer.

[0041] Example 2

[0042] A garden soil remediation fertilizer comprises the following components by weight: 30 parts of well-rotted organic fertilizer, 20 parts of plant-derived organic materials, 15 parts of mineral conditioner, 15 parts of microbial nutrient activator, and 15 parts of compound microbial agent.

[0043] The decomposed organic fertilizer includes decomposed cow and sheep manure, decomposed poultry manure, and decomposed kitchen waste; these are mixed in a mass ratio of 2:1.5:0.8. The plant-derived organic materials include pine needle powder, straw powder, modified rice husk charcoal, and coconut coir; these are mixed in a mass ratio of 1:2:1.5:0.8.

[0044] The preparation method of modified rice husk charcoal includes the following steps:

[0045] (1) The rice husks after impurity removal were heated to 550°C at a heating rate of 8°C / min under nitrogen protection, treated for 1.5h and then cooled to room temperature. The collected rice husk charcoal was ground and the obtained rice husk charcoal powder was used for later use.

[0046] (2) Take the rice husk charcoal powder from step (1) and add it to a 1 mol / L FeCl3 solution at a ratio of 1:12. Stir for 10 h and then age at 70℃ for 24 h. The resulting mixture is ready for use.

[0047] (3) The mixture described in step (2) is dried at 105°C for 12 hours and then calcined in air at 320°C for 2 hours. After cooling to room temperature, it is ground to obtain modified rice husk charcoal.

[0048] The mineral conditioning agent includes zeolite powder, maifanite powder and dolomite powder, and the zeolite powder, maifanite powder and dolomite powder are mixed in a mass ratio of 2:1.5:0.8; the microbial nutrient activator includes humic acid and chitin, and humic acid and chitin are mixed in a mass ratio of 1.5:1.

[0049] The compound microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus lentigines, and Bacillus megaterium, which are mixed in a mass ratio of 3:3:3:2.

[0050] The preparation method of garden soil remediation fertilizer includes the following technological steps:

[0051] (1) Mix the pre-treated decomposed organic fertilizer, plant-derived organic materials and mineral conditioner according to the formula ratio and set aside.

[0052] (2) Add the microbial nutrient activator to step (1) according to the formula ratio, stir and mix, then add the compound microbial agent according to the formula ratio, continue to stir and mix, and pile it up for 36 hours under cool, ventilated and dark conditions to obtain garden soil remediation fertilizer.

[0053] Example 3

[0054] A garden soil remediation fertilizer comprises the following components by weight: 40 parts of well-rotted organic fertilizer, 30 parts of plant-derived organic materials, 20 parts of mineral conditioner, 20 parts of microbial nutrient activator, and 20 parts of compound microbial agent.

[0055] The decomposed organic fertilizer includes decomposed cow and sheep manure, decomposed poultry manure, and decomposed kitchen waste; the decomposed cow and sheep manure, decomposed poultry manure, and decomposed kitchen waste are mixed in a mass ratio of 3:2:1; the plant-derived organic materials include pine needle powder, straw powder, modified rice husk charcoal, and coconut coir; the pine needle powder, straw powder, modified rice husk charcoal, and coconut coir are mixed in a mass ratio of 1:3:2:1.

[0056] The preparation method of modified rice husk charcoal includes the following steps:

[0057] (1) The rice husks after impurity removal are heated to 600°C at a heating rate of 10°C / min under nitrogen protection. After treatment for 2 hours, they are cooled to room temperature. The collected rice husk charcoal is ground to obtain rice husk charcoal powder for use.

[0058] (2) Take the rice husk charcoal powder from step (1) and add it to a 1 mol / L FeCl3 solution at a ratio of 1:15. Stir for 12 h and then age at 80℃ for 24 h. The resulting mixture is ready for use.

[0059] (3) The mixture in step (2) is dried at 105°C for 12 hours and then calcined in air at 350°C for 2 hours. After cooling to room temperature, it is ground to obtain modified rice husk charcoal.

[0060] The mineral conditioning agents include zeolite powder, maifanite powder, and dolomite powder, which are mixed in a mass ratio of 3:2:1; the microbial nutrient activators include humic acid and chitin, which are mixed in a mass ratio of 2:1.

[0061] The compound microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus lentigines, and Bacillus megaterium, which are mixed in a mass ratio of 3:2:2:3.

[0062] The preparation method of garden soil remediation fertilizer includes the following technological steps:

[0063] (1) Mix the pre-treated decomposed organic fertilizer, plant-derived organic materials and mineral conditioner according to the formula ratio and set aside.

[0064] (2) Add the microbial nutrient activator to step (1) according to the formula ratio, stir and mix, then add the compound microbial agent according to the formula ratio, continue to stir and mix, and pile it up for 48 hours under cool, ventilated and dark conditions to obtain garden soil remediation fertilizer.

[0065] To better demonstrate that the garden soil remediation fertilizer of the present invention has a good soil remediation effect, the following comparative example is given with reference to Example 2, and the soil remediation fertilizer prepared in Example 2 and the soil remediation fertilizer prepared in the comparative example are examined.

[0066] Comparative Example 1

[0067] Unlike Example 2, the garden soil remediation fertilizer does not contain microbial nutrient activators or compound microbial agents.

[0068] Comparative Example 2

[0069] Unlike Example 2, the garden soil remediation fertilizer uses ordinary rice husk charcoal, but the rest of the operation is the same.

[0070] Comparative Example 3

[0071] Unlike implementation 2, the garden soil remediation fertilizer contains only Bacillus subtilis, while the rest of the operation is the same.

[0072] Comparative Example 4

[0073] Unlike Example 2, the soil remediation fertilizer for gardens was prepared with a 12-hour stacking and activation time, while the rest of the operations were the same.

[0074] (I) Investigation of soil physicochemical properties and biological activity, as well as environmental safety and plant growth response

[0075] 1. Experimental Materials

[0076] Test soil: Soil from a park in this city that has degraded due to construction waste dumping (moderately compacted, low in organic matter, and poor in fertility). Passed through a 2mm sieve and mixed thoroughly for later use.

[0077] Fertilizers used in the test: Fertilizers for the five treatment groups (Example 2, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4) and commercially available common organic fertilizer (CF, as a commercial control) were prepared strictly in accordance with the technical plan.

[0078] Test plant: Ryegrass.

[0079] Experimental container: plastic planting pot (top diameter 25cm, height 20cm), with tray.

[0080] 2. Experimental Design

[0081] Experimental treatments: A total of 7 treatments were set up.

[0082] CK: Blank control, containing only soil and no fertilizer.

[0083] CF: Commercial control, using an equal amount of commercially available well-rotted sheep manure organic fertilizer.

[0084] T1: Fertilizer from Example 2.

[0085] D1-D4: Comparative Fertilizers 1-4

[0086] Fertilizer application amount and method: Fill each pot with 5kg of soil. The amount of fertilizer is 3% of the soil weight (i.e., 150g / pot), and it should be thoroughly mixed with the top 0-10cm of soil.

[0087] Plant cultivation: Sow 0.5g of ryegrass seeds evenly in each pot, and thin to 30 seedlings per pot after germination. Cultivate in a temperature- and light-controlled incubator, and water regularly and quantitatively to maintain soil moisture content at 60%-70% of field capacity.

[0088] Repeat settings: Each treatment is set to repeat 5 times, with completely randomized block arrangement.

[0089] Sampling and Measurement:

[0090] Time points: Destructive sampling was conducted on day 0 (basic soil sample), day 30, and day 60 after the start of the incubation experiment.

[0091] Samples: Approximately 500g of mixed soil was taken from each pot. A portion of the fresh sample was used for biological index determination, and the portion was air-dried for physicochemical index determination. Plant biomass was also measured simultaneously.

[0092] 3. Measurement Indicators and Methods

[0093] Physicochemical indicators: pH (NY / T1377), EC, organic matter (NY / T1121.6), available nitrogen, phosphorus and potassium (LY / T1228-2015, 1230-2015, 1234-2015), bulk density (NY / T1121.4).

[0094] Biological indicators: microbial biomass carbon (chloroform fumigation-K2SO4 extraction method), urease and phosphatase activities (kit method).

[0095] Environmental safety: Seed germination index (GI).

[0096] Plant response: aboveground fresh weight and dry weight. Specific test results are shown in Tables 1-3.

[0097]

[0098]

[0099] Data from Tables 1 and 2 show that group T1 was significantly superior to the control (CK) and the commercially available control (CF) in all soil fertility indicators (organic matter +192%, available phosphorus +674%), soil structure (bulk weight decreased by 13.8%), microbial activity (MBC +214%), and plant biomass (fresh weight +244%). While group D1 (no microorganisms) showed a similar increase in organic matter as T1 (due to physical addition), its microbial biomass carbon (MBC), enzyme activity, and plant growth were significantly lower than T1. Its GI value was acceptable, indicating that the safety came from the decomposed organic matter. Group T1 was significantly superior to group D2 (ordinary charcoal) in MBC, enzyme activity, and plant growth, indicating that modified charcoal provided a better microbial habitat and a nutrient slow-release carrier. Group T1's MBC, two enzyme activities, and plant dry weight were significantly higher than group D3 (single-strain). The effect of single-strain treatment was unstable. The multi-species combination achieved functional complementarity (Bacillus subtilis and Lichen—decomposition and biocontrol; Gel-like and Giant Pleurotus ostreatus—phosphate solubilization and nitrogen fixation), producing a synergistic effect greater than the sum of its parts (1+1>2). Group D4 (12h maturation) had the lowest GI value, and the plant fresh weight was also significantly lower than that of T1. This indicates that insufficient maturation may have left residual inhibitory substances or resulted in inadequate activation of the microbial agents.

[0100] (II) Investigation into the remediation of heavy metal pollution

[0101] 1. Experimental Materials

[0102] Test soil: Soil from the green space on the edge of an abandoned industrial area

[0103] Basic properties: pH 6.8±0.3, organic matter 1.5%, severe Pb-Cd combined pollution.

[0104] Background levels of heavy metals (total): Pb 450±25 mg / kg, Cd 2.8±0.3 mg / kg

[0105] Processing method: Air dry, pass through a 2mm sieve, and mix thoroughly;

[0106] Fertilizers tested: Same as before (T1 and D1-D4)

[0107] Plant materials:

[0108] Restoration Plant: Sedum plumbizincicola - Hyperaccumulator

[0109] Indicator plant: Ryegrass - a sensitive indicator plant

[0110] Garden Plants: Viola philippica - Common Garden Ground Cover

[0111] Containers and equipment: Plastic basin (30cm in diameter, 25cm in height), atomic absorption spectrometer (AAS)

[0112] Inductively coupled plasma mass spectrometry (ICP-MS) and continuous extraction speciation analysis equipment;

[0113] 2 Experimental Design

[0114] Pot experiment on the passivation effect of heavy metals

[0115] Treatment settings (7): CK: contaminated soil, no fertilizer applied; T1: fertilizer from Example 2; D1-D4: fertilizers from Comparative Examples 1-4; PC: positive control (commercially available heavy metal passivating agent, silicate minerals).

[0116] Fertilization plan: The amount of fertilizer applied is 4% of the soil weight (more than usual, to enhance the restoration effect).

[0117] Mixing method: Mix thoroughly with the 0-15cm soil layer.

[0118] Planting arrangement: Each treatment consists of 5 Sedum sarmentosum plants, 10 Lorrax ryegrass plants, and 3 Viola yedoensis plants.

[0119] Cultivation conditions: Greenhouse, natural light, regular watering

[0120] Culture period: 90 days

[0121] Sampling time: 0, 30, 60, 90 days

[0122]

[0123] It should be noted that the effective Cd (mg / kg) and effective Pb (mg / kg) values ​​detected by CK at day 0 were 0.92±0.06 and 42.5±2.5, respectively.

[0124] Table 3 shows that the effect of T1 treatment increases over time, with Cd / Pb passivation rates reaching 72.9% and 73.3% respectively after 90 days; D2 (ordinary carbon) is significantly weaker than T1, with a 16.3 percentage point difference in Cd passivation rate after 90 days; D1 (no microorganisms) has a stable but limited effect, indicating that microorganisms have a continuous contribution to long-term remediation.

[0125] D4 has the most unstable effect and differs significantly from T1.

[0126]

[0127] As shown in Table 4, the heavy metal content of plants decreased by 66-70% and the biomass increased by nearly 3 times under the T1 treatment; the survival rate of Viola yedoensis increased from 45% to 95%, indicating a significant reduction in soil ecotoxicity; the D2 treatment was more effective than PC in reducing plant Pb content.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A soil remediation fertilizer for gardens, characterized in that, The product comprises the following components by weight: 20-40 parts of well-rotted organic fertilizer, 10-30 parts of plant-derived organic materials, 10-20 parts of mineral conditioner, 10-20 parts of microbial nutrient activator, and 10-20 parts of compound microbial agent.

2. The garden soil remediation fertilizer according to claim 1, characterized in that, The garden soil remediation fertilizer comprises the following components by weight: 30 parts of well-rotted organic fertilizer, 20 parts of plant-derived organic materials, 15 parts of mineral conditioner, 15 parts of microbial nutrient activator, and 15 parts of compound microbial agent.

3. The garden soil remediation fertilizer according to claim 1, characterized in that, The decomposed organic fertilizer includes decomposed cow and sheep manure, decomposed poultry manure, and decomposed kitchen waste; the decomposed cow and sheep manure, decomposed poultry manure, and decomposed kitchen waste are mixed in a mass ratio of 1-3:1-2:0.5-1; the plant-derived organic materials include pine needle powder, straw powder, modified rice husk charcoal, and coconut coir; the pine needle powder, straw powder, modified rice husk charcoal, and coconut coir are mixed in a mass ratio of 1:1-3:1-2:0.5-1.

4. The garden soil remediation fertilizer according to claim 1, characterized in that, The preparation method of the modified rice husk charcoal includes the following steps: (1) The rice husks after impurity removal are heated to 500-600℃ at a heating rate of 5-10℃ / min under nitrogen protection. After treatment for 1-2 hours, they are cooled to room temperature. The collected rice husk charcoal is ground to obtain rice husk charcoal powder for use. (2) Take the rice husk charcoal powder from step (1) and add it to a 1 mol / L FeCl3 solution at a ratio of 1:10-15. Stir for 6-12 hours and then age at 60-80℃ for 24 hours. The resulting mixture is ready for use. (3) The mixture described in step (2) is dried at 105°C for 12 hours and then calcined in air at 300-350°C for 2 hours. After cooling to room temperature, it is ground to obtain modified rice husk charcoal.

5. A garden soil remediation fertilizer according to claim 1, characterized in that, The mineral conditioning agent includes zeolite powder, maifanite powder and dolomite powder, and the zeolite powder, maifanite powder and dolomite powder are mixed in a mass ratio of 1-3:1-2:0.5-1; the microbial nutrient activator includes humic acid and chitin, and the humic acid and chitin are mixed in a mass ratio of 1-2:

1.

6. The garden soil remediation fertilizer according to claim 1, characterized in that, The compound microbial agent includes Bacillus subtilis, Bacillus licheniformis, Bacillus lentigines, and Bacillus megaterium, which are mixed in a mass ratio of 1-3:1-2:1-2:1-3.

7. The garden soil remediation fertilizer according to claim 1, characterized in that, The Bacillus subtilis, Bacillus licheniformis, Bacillus gelatinosa, and Bacillus megaterium were mixed in a mass ratio of 3:3:3:

2.

8. A method for preparing a garden soil remediation fertilizer as described in claim 1, characterized in that, The preparation method includes the following process steps: (1) Mix the pre-treated decomposed organic fertilizer, plant-derived organic materials and mineral conditioner according to the formula ratio and set aside. (2) Add the microbial nutrient activator to step (1) according to the formula ratio, stir and mix, then add the compound microbial agent according to the formula ratio, continue to stir and mix, and pile it in a cool, ventilated and dark place for 24-48 hours to obtain garden soil remediation fertilizer.

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