Soil remediation fertilizer and preparation method thereof

Abstract

The invention belongs to the technical field of agricultural fertilizers, and provides a soil remediation fertilizer and a preparation method thereof. The preparation method comprises the following steps: S1, sequentially drying and crushing a natural organic matter material to obtain a pretreated natural organic matter material; s2, mixing the pretreated natural organic matter material, microbial flora, a plant growth regulator, a stabilizer and a slow release agent, and performing fermentation treatment to obtain a compound fertilizer; s3, sequentially drying, granulating and packaging the compound fertilizer to obtain the soil remediation fertilizer. The soil remediation fertilizer provided by the invention can effectively solve the remediation problem of organic matter and heavy metal contaminated soil, improve the soil quality and promote plant growth, and has remarkable environmental protection and agricultural sustainable development benefits.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural fertilizers, and in particular to a soil remediation fertilizer and a preparation method thereof. Background Art

[0002] Soil fertilizer plays a vital role in modern agriculture, and it has an important impact on improving crop yield and quality. However, the use and trend of existing soil fertilizers have caused people's concerns. Excessive use of chemical fertilizers can cause soil hardening and acidification, causing the soil to lose its original loose structure and affecting the growth of crop roots. At the same time, the accumulation of nitrogen, phosphorus and other elements in chemical fertilizers in the soil will cause soil acidification, further affecting the growth of crops. In addition, improper use of fertilizers, especially excessive use of chemical fertilizers, can also damage the microbial community in the soil, leading to a decrease in soil biodiversity, thereby affecting the ecological function of the soil. What's more serious is that some fertilizers contain heavy metals and other harmful substances. Long-term and large-scale use will cause these substances to accumulate in the soil, eventually causing soil pollution.

[0003] In the field of soil remediation, traditional methods usually use chemical, physical or biological remediation technologies to treat soil contaminated by organic matter and heavy metals. For example, chemical stabilizers are used to fix heavy metals in the soil, or organic fertilizers are applied to promote the degradation of organic matter. However, these traditional methods generally have certain shortcomings, such as the single remediation effect, and it is difficult to effectively remediate organic and heavy metal pollution at the same time; in addition, some chemical stabilizers may cause secondary pollution to the soil structure and ecological environment, and the remediation effect of organic fertilizers is affected by soil type and environmental conditions, and it is difficult to ensure stability and durability. Therefore, how to develop a soil remediation fertilizer that can not only repair soil contaminated by heavy metals and organic matter, but also improve soil fertility has become a problem that technicians in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present invention provides a soil remediation fertilizer and a preparation method thereof, the purpose of which is to solve the technical problem that the existing soil remediation fertilizer has a single function of remediating soil contaminated by organic matter and heavy metals.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides a soil remediation fertilizer, comprising the following components in parts by weight:

[0007] 30-60 parts of natural organic materials, 5-15 parts of microbial flora, 0.5-2 parts of plant growth regulators, 5-10 parts of stabilizers, and 5-15 parts of sustained-release agents.

[0008] Furthermore, the natural organic material includes one or more of humic acid, peat, corn stalks and livestock and poultry manure.

[0009] Furthermore, the microbial flora includes degrading bacteria and transforming bacteria.

[0010] Furthermore, the usage ratio of the degradation bacteria to the transformation bacteria is 1:1-5.

[0011] Furthermore, the plant growth regulator includes one or more of gibberellins, naphthylacetic acid, indoleacetic acid, chlormequat chloride and paclobutrazol.

[0012] Furthermore, the stabilizer includes silicate and / or phosphate.

[0013] Furthermore, the sustained-release agent includes one or more of sodium hydroxymethyl cellulose, sepiolite, vermiculite powder, polyvinyl alcohol and starch.

[0014] The present invention provides a method for preparing the soil remediation fertilizer, comprising the following steps:

[0015] S1, drying and crushing the natural organic material in sequence to obtain a pretreated natural organic material;

[0016] S2, mixing the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent and fermenting them to obtain a compound fertilizer;

[0017] S3. The compound fertilizer is dried, granulated and packaged in sequence to obtain soil repair fertilizer.

[0018] Furthermore, in step S2, the temperature of the fermentation treatment is 35-45° C., the humidity of the fermentation treatment is 60-80%, and the fermentation treatment time is 14-21 days.

[0019] Furthermore, in step S3, the particle size of the soil remediation fertilizer is 1 to 5 mm.

[0020] It can be seen from the above technical solution that compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The present invention uses natural organic materials as carriers, which can not only improve soil structure, increase soil porosity, and effectively improve soil fertility; it can also provide organic nutrients necessary for plant growth, promote the development of plant roots, and provide a better growth environment for plants.

[0022] 2. The microbial flora included in the present invention, especially the degrading bacteria and the transforming bacteria, can effectively decompose the organic pollutants in the soil and transform the heavy metals into a form that is difficult for plants to absorb through biological transformation. This process not only reduces soil pollution, but also reduces the toxic effects of pollutants on plants, thereby improving the environmental quality of the soil and the safety of crops.

[0023] 3. The plant growth regulator added in the present invention can significantly enhance the plant's ability to absorb the repair material, promote plant growth, and accelerate the soil repair process.

[0024] 4. The stabilizer used in the present invention ensures the long-term effectiveness of the microbial flora in the soil. The addition of the stabilizer effectively prevents the microbial flora from losing activity due to environmental changes, thereby ensuring the continuity and stability of soil remediation.

[0025] 5. The slow-release agent added in the present invention enables the fertilizer effect to be continuously released and prolongs the repairing time. DETAILED DESCRIPTION

[0026] The present invention provides a soil remediation fertilizer, comprising the following components in parts by weight:

[0027] 30-60 parts of natural organic materials, 5-15 parts of microbial flora, 0.5-2 parts of plant growth regulators, 5-10 parts of stabilizers, and 5-15 parts of sustained-release agents.

[0028] In the present invention, the amount of the natural organic material used is preferably 35 to 55 parts, more preferably 40 to 50 parts.

[0029] In the present invention, the amount of the microbial flora is preferably 8 to 12 parts, more preferably 10 parts.

[0030] In the present invention, the amount of the plant growth regulator is preferably 0.8 to 1.6 parts, more preferably 1.0 to 1.5 parts.

[0031] In the present invention, the amount of the stabilizer used is preferably 6 to 9 parts, more preferably 7 to 8 parts.

[0032] In the present invention, the amount of the sustained-release agent is preferably 7 to 13 parts, more preferably 8 to 12 parts.

[0033] In the present invention, the natural organic material includes one or more of humic acid, peat, corn stalks and livestock and poultry manure, preferably one or more of humic acid, peat and livestock and poultry manure, and more preferably humic acid and / or peat.

[0034] In the present invention, the microbial flora includes degrading bacteria and transforming bacteria; the degrading bacteria are preferably one or more of Bacillus subtilis, Pseudomonas aeruginosa and Rhodococcus; the transforming bacteria are preferably one or more of Thiobacillus oxidans, mycorrhizal fungi and Metarhizium.

[0035] In the present invention, the usage ratio of the degradation bacteria to the transformation bacteria is 1:1-5, preferably 1:2-4, and more preferably 1:3.

[0036] In the present invention, the plant growth regulator comprises one or more of gibberellins, naphthylacetic acid, indoleacetic acid, chlormequat chloride and paclobutrazol, preferably one or more of gibberellins, naphthylacetic acid, chlormequat chloride and paclobutrazol, and further preferably one or more of gibberellins, chlormequat chloride and paclobutrazol.

[0037] In the present invention, the stabilizer includes silicate and / or phosphate; the silicate is preferably potassium silicate and / or sodium silicate; the phosphate is preferably monoammonium phosphate and / or diammonium phosphate.

[0038] In the present invention, the sustained-release agent includes one or more of sodium hydroxymethyl cellulose, sepiolite, vermiculite powder, polyvinyl alcohol and starch, preferably one or more of sodium hydroxymethyl cellulose, sepiolite, polyvinyl alcohol and starch, and further preferably one or more of sepiolite, polyvinyl alcohol and starch.

[0039] In the present invention, when the soil remediation fertilizer is used, the soil remediation fertilizer is evenly spread on the surface of the contaminated soil, and then plowed into the soil to ensure that the fertilizer and the soil are fully mixed; the amount of the soil remediation fertilizer is 50 to 100 kg / mu, preferably 60 to 90 kg / mu, and more preferably 70 to 80 kg / mu.

[0040] The present invention provides a method for preparing the soil remediation fertilizer, comprising the following steps:

[0041] S1, drying and crushing the natural organic material in sequence to obtain a pretreated natural organic material;

[0042] S2, mixing the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent and fermenting them to obtain a compound fertilizer;

[0043] S3. The compound fertilizer is dried, granulated and packaged in sequence to obtain soil repair fertilizer.

[0044] In the present invention, in step S2, the fermentation temperature is 35-45°C, preferably 37-42°C, and more preferably 40°C; the fermentation humidity is 60-80%, preferably 65-75%, and more preferably 70%; the fermentation time is 14-21 days, preferably 15-20 days, and more preferably 16-18 days.

[0045] In the present invention, in step S3, the particle size of the soil remediation fertilizer is 1 to 5 mm, preferably 2 to 4 mm.

[0046] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0047] Example 1

[0048] The raw material components used in this embodiment are as follows:

[0049] 50 parts of natural organic materials (the dosage ratio of peat, corn straw and livestock and poultry manure is 1:2:2), 10 parts of microbial flora (the dosage ratio of degradation bacteria and transformation bacteria is 1:4), 1 part of plant growth regulator (0.2 parts each of gibberellin, naphthylacetic acid, indoleacetic acid, chlormequat chloride and paclobutrazol), 8 parts of stabilizer (4 parts each of potassium silicate and diammonium phosphate), 10 parts of sustained-release agent (2 parts each of sodium hydroxymethyl cellulose, sepiolite, vermiculite powder, polyvinyl alcohol and starch).

[0050] The preparation process of the soil remediation fertilizer is as follows:

[0051] The natural organic material is dried and crushed to obtain the pretreated natural organic material; the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent are mixed, the temperature is maintained at 40°C and the humidity is 70%, and the compound fertilizer is fermented for 18 days to obtain the compound fertilizer; after the fermentation is completed, the compound fertilizer is dried to remove moisture, and then granulated and packaged to obtain the soil repair fertilizer.

[0052] Example 2

[0053] The raw material components used in this embodiment are as follows:

[0054] 60 parts of natural organic materials (the dosage ratio of humic acid, peat, corn straw and livestock and poultry manure is 1:1:2:2), 12 parts of microbial flora (the dosage ratio of degradation bacteria and transformation bacteria is 1:3), 2 parts of plant growth regulators (0.4 parts each of gibberellins, naphthylacetic acid, indoleacetic acid, chlormequat chloride and paclobutrazol), 6 parts of stabilizers (3 parts each of sodium silicate and monoammonium phosphate), 12 parts of sustained-release agents (3 parts each of sodium hydroxymethyl cellulose, vermiculite powder, polyvinyl alcohol and starch).

[0055] The preparation process of the soil remediation fertilizer is as follows:

[0056] The natural organic material is dried and crushed to obtain the pretreated natural organic material; the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent are mixed, the temperature is maintained at 45°C and the humidity is 75%, and the compound fertilizer is fermented for 15 days to obtain the compound fertilizer; after the fermentation is completed, the compound fertilizer is dried to remove moisture, and then granulated and packaged to obtain the soil repair fertilizer.

[0057] Example 3

[0058] The raw material components used in this embodiment are as follows:

[0059] 40 parts of natural organic materials (the dosage ratio of humic acid, corn straw and livestock and poultry manure is 1:1:2), 14 parts of microbial flora (the dosage ratio of degradation bacteria and transformation bacteria is 1:1), 1.5 parts of plant growth regulators (0.3 parts each of gibberellins, naphthylacetic acid, indoleacetic acid, chlormequat chloride and paclobutrazol), 10 parts of stabilizers (5 parts each of potassium silicate and monoammonium phosphate), and 14 parts of sustained-release agents (7 parts each of sodium hydroxymethyl cellulose and starch).

[0060] The preparation process of the soil remediation fertilizer is as follows:

[0061] The natural organic material is dried and crushed to obtain the pretreated natural organic material; the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent are mixed, the temperature is maintained at 42° C. and the humidity is 80%, and the compound fertilizer is fermented for 15 days to obtain the compound fertilizer; after the fermentation is completed, the compound fertilizer is dried to remove moisture, and then granulated and packaged to obtain the soil repair fertilizer.

[0062] Example 4

[0063] The raw material components used in this embodiment are as follows:

[0064] 55 parts of natural organic materials (the dosage ratio of peat, corn straw and livestock and poultry manure is 2:2:1), 8 parts of microbial flora (the dosage ratio of degradation bacteria and transformation bacteria is 1:3), 0.8 parts of plant growth regulators (0.2 parts each of gibberellin, naphthylacetic acid, chlormequat chloride and paclobutrazol), 7 parts of stabilizers (the dosage ratio of sodium silicate and diammonium phosphate is 3:4), 8 parts of sustained-release agents (2 parts each of sodium hydroxymethyl cellulose, vermiculite powder, polyvinyl alcohol and starch).

[0065] The preparation process of the soil remediation fertilizer is as follows:

[0066] The natural organic material is dried and crushed to obtain the pretreated natural organic material; the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent are mixed, the temperature is maintained at 35°C and the humidity is 65%, and the compound fertilizer is fermented for 21 days to obtain the compound fertilizer; after the fermentation is completed, the compound fertilizer is dried to remove moisture, and then granulated and packaged to obtain the soil repair fertilizer.

[0067] Example 5

[0068] The raw material components used in this embodiment are as follows:

[0069] 35 parts of natural organic materials (peat, humic acid and livestock and poultry manure are used in a ratio of 1:2:2), 6 parts of microbial flora (degradation bacteria and transformation bacteria are used in a ratio of 1:2), 0.5 parts of plant growth regulators (0.1 parts each of gibberellins, naphthylacetic acid, indoleacetic acid, chlormequat chloride and paclobutrazol), 5 parts of stabilizers (sodium silicate and monoammonium phosphate are used in a ratio of 2:3), 5 parts of sustained-release agents (1 part each of sodium hydroxymethyl cellulose, sepiolite, vermiculite powder, polyvinyl alcohol and starch).

[0070] The preparation process of the soil remediation fertilizer is as follows:

[0071] The natural organic material is dried and crushed to obtain the pretreated natural organic material; the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent are mixed, the temperature is maintained at 37°C and the humidity is 62%, and the compound fertilizer is fermented for 20 days to obtain the compound fertilizer; after the fermentation is completed, the compound fertilizer is dried to remove moisture, and then granulated and packaged to obtain the soil repair fertilizer.

[0072] Performance Testing

[0073] 1. Six pieces of heavy metal-contaminated soybean test field soil were selected to detect the initial content of heavy metals in the soil. Then, during the soybean planting period, one of the pieces used ordinary fertilizer (Stanley compound fertilizer) as a control group, and the other five pieces used the soil remediation fertilizer prepared in Examples 1 to 5, with a fertilizer application rate of 70 kg / mu. During the planting period, the heavy metals in the six pieces of soil were sampled and analyzed, and the test results are shown in Table 1.

[0074] Table 1 Heavy metal detection results

[0075] category Hg(mg / kg) As (mg / kg) Pb(mg / kg) Cd(mg / kg) Initial content 1.54 90.36 224.12 1.98 Example 1 0.07 3.62 6.72 0.12 Example 2 0.08 4.51 7.65 0.16 Example 3 0.12 3.79 8.11 0.14 Example 4 0.11 4.22 7.29 0.13 Example 5 0.08 3.87 6.94 0.14 Control group 0.83 51.50 44.82 0.99

[0076] 2. Six plots of soybean test field soil contaminated by organic matter were selected to detect the initial content of organic matter in the soil. Then, during the soybean planting period, one of the plots was treated with ordinary fertilizer (Stanley compound fertilizer) as a control group, and the other five plots were treated with soil remediation fertilizers prepared in Examples 1 to 5, with a fertilizer application rate of 70 kg / mu. During the planting period, the organic matter in the six plots of soil was sampled and analyzed, and the test results are shown in Table 2.

[0077] Table 2 Organic matter detection results

[0078]

[0079]

[0080] As can be seen from Table 1 and Table 2, the soil remediation fertilizer provided by the present invention shows excellent removal effects on both heavy metals and organic matter. It can effectively reduce the content of heavy metals in the soil and reduce the harm of heavy metals to the environment and organisms. At the same time, the soil remediation fertilizer also has a significant degradation effect on organic pollutants in the soil, thereby improving soil quality and promoting plant growth.

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A soil remediation fertilizer, characterized in that: The composition comprises the following components in parts by weight: 30-60 parts of natural organic materials, 5-15 parts of microbial flora, 0.5-2 parts of plant growth regulators, 5-10 parts of stabilizers, and 5-15 parts of sustained-release agents.

2. The soil remediation fertilizer according to claim 1, characterized in that: The natural organic material includes one or more of humic acid, peat, corn stalks and livestock and poultry manure.

3. The soil remediation fertilizer according to claim 2, characterized in that: The microbial flora includes degrading bacteria and transforming bacteria.

4. The soil remediation fertilizer according to claim 3, characterized in that: The dosage ratio of the degradation bacteria to the transformation bacteria is 1:1-5.

5. The soil remediation fertilizer according to claim 1, characterized in that: The plant growth regulator comprises one or more of gibberellins, naphthylacetic acid, indoleacetic acid, chlormequat chloride and paclobutrazol.

6. The soil remediation fertilizer according to any one of claims 1 to 5, characterized in that: The stabilizer includes silicates and / or phosphates.

7. The soil remediation fertilizer according to claim 6, characterized in that: The sustained-release agent includes one or more of sodium hydroxymethylcellulose, sepiolite, vermiculite powder, polyvinyl alcohol and starch.

8. The method for preparing the soil remediation fertilizer according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, drying and crushing the natural organic material in sequence to obtain a pretreated natural organic material; S2, mixing the pretreated natural organic material, microbial flora, plant growth regulator, stabilizer and slow-release agent and fermenting them to obtain a compound fertilizer; S3. The compound fertilizer is dried, granulated and packaged in sequence to obtain soil repair fertilizer.

9. The preparation method according to claim 8, characterized in that: In step S2, the temperature of the fermentation treatment is 35-45° C., the humidity of the fermentation treatment is 60-80%, and the fermentation treatment time is 14-21 days.

10. The preparation method according to claim 8, characterized in that: In step S3, the particle size of the soil remediation fertilizer is 1 to 5 mm.

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