CN115180992A - Novel soil heavy metal conditioner and preparation method thereof - Google Patents
Novel soil heavy metal conditioner and preparation method thereof Download PDFInfo
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- CN115180992A CN115180992A CN202210757675.5A CN202210757675A CN115180992A CN 115180992 A CN115180992 A CN 115180992A CN 202210757675 A CN202210757675 A CN 202210757675A CN 115180992 A CN115180992 A CN 115180992A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
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- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Pest Control & Pesticides (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
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Abstract
The invention discloses a novel soil heavy metal conditioner and a preparation method thereof, and belongs to the technical field of recycling of biological resources. A novel soil heavy metal conditioner comprises the following components in parts by weight: 60-70 parts of oil tea shells, 30-50 parts of fruit shells, 20-40 parts of straws, 30-60 parts of sludge and 10-20 parts of polysaccharide polypeptide biological potassium. According to the invention, the agricultural organic garbage and the industrial organic garbage are combined to prepare the novel heavy metal conditioner, and the novel heavy metal conditioner is applied to the barren soil, so that the soil fertility is improved, the crop yield is increased, and the ecological resource recycling is realized; the mixed activated carbon adsorbs free heavy metals in the soil, so that the migration of the heavy metals is influenced, and the absorption of the crops on the heavy metals is reduced; the novel heavy metal conditioner can continuously improve the fertility of barren soil and improve the action time.
Description
Technical Field
The invention belongs to the technical field of recycling of biological resources, and particularly relates to a novel soil heavy metal conditioner and a preparation method thereof.
Background
The cyclic utilization of biological resources is the main melody of the current times, and can not only realize sustainable development, but also protect the environment. China has abundant land resources, and various crops are planted, so that the developed products are various. Whether agricultural product production or agricultural product use, some organic garbage can be generated. Along with the development of the industry, the organic garbage produced by factories is increasing day by day. How to change organic waste into valuable becomes a mainstream research object of related companies or research institutes.
In the prior art, there are many cases of changing waste into valuable, such as producing wood pulp paper and other products by using agricultural straws as raw materials, producing red bricks by using industrial sludge and the like, but the agricultural organic garbage or the industrial organic garbage is generally recycled independently, and the recycling research of the combination of the agricultural organic garbage and the industrial organic garbage is less.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems, the invention provides a novel soil heavy metal conditioner and a preparation method thereof.
The technical scheme is as follows: a novel soil heavy metal conditioner comprises the following components in parts by weight: 60 to 70 parts of oil tea shell, 30 to 50 parts of fruit shell, 20 to 40 parts of straw, 30 to 60 parts of sludge and 10 to 20 parts of polysaccharide polypeptide biological potassium.
In the technical scheme, the agricultural organic garbage is prepared from oil-tea camellia shells, fruit shells and straws, the oil-tea camellia shells are oil-tea camellia seed shells, the fruit shells are one or a combination of more of walnut shells, apricot shells, cherry shells, wild jujubes and peach shells, and the straws are one or a combination of more of wheat straws, corn straws and rice straws. The raw materials have large production capacity in China and are easy to obtain. The industrial organic garbage is industrial sludge which is rich in a large amount of organic matters. In the prior art, the combination and recovery of the raw materials are rare, and how to combine the raw materials and generate a new product is provided. In research, the oil-tea camellia shells, fruit shells and straws are rich in a large amount of carbon elements, the industrial sludge is rich in nitrogen and phosphorus elements, and the elements rich in the raw materials are combined to generate a novel soil heavy metal conditioner, so that a carbon source, a nitrogen source and a phosphorus source can be well provided for crops.
Therefore, through research, in another technical scheme, a preparation method of a novel soil heavy metal conditioner is provided, and the preparation method is used for preparing the novel soil heavy metal conditioner and comprises the following steps:
crushing oil tea shells, fruit shells and straws to obtain mixed powder, and pyrolyzing the mixed powder for 2 to 3 hours at the temperature of 600 to 700 ℃ under the protection of inert gas to obtain mixed charcoal; introducing air into the sludge, heating and sterilizing; cooling and maintaining at 30 to 37 ℃, adding zymophyte, and fermenting for 24 to 48 hours to obtain fermented sludge; drying the fermented sludge and grinding the sludge into powder to obtain sludge micro powder; adding deionized water, mixed biochar and polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring to obtain a mixed solution; and evaporating the mixed solution to remove water to obtain a mixed solid, and performing compression granulation to obtain the heavy metal conditioner.
The oil tea shell, the fruit shell and the straw contain cellulose, lignin, hemicellulose and the like, and mixed biochar is generated under the pyrolysis condition; through test tests, biochar generated by the oil-tea camellia shells and the fruit shells is coarse and hard, large in particle size and high in porosity and specific surface area; the biochar prepared from the straws is relatively finer, and the porosity and the specific surface area are relatively lower. The sludge is industrial organic sludge rich in nitrogen and phosphorus. And introducing air into the sludge for heating and sterilizing, wherein the heating and sterilizing temperature is 75-80 ℃, the air is mainly introduced for introducing oxygen, and the heating and sterilizing duration is 5-8 days. In the heating sterilization, the pathogenic microorganism is inactivated by the bacterium problem solving effect caused by the microbial exoenzyme, and the sterilization capability is very high by aerobic digestion. After biological sterilization, pathogenic microorganisms in the sludge, such as escherichia coli, streptococcus, pasteurella and the like, can be completely inactivated. The sterilized sludge cannot be directly applied to crops because the organic matter content concentration in the sludge is high and is larger than the crop concentration, and if the sludge is directly acted on the crops, the cells at the roots of the crops are easy to lose water because of the large external osmotic pressure, so that the crops are damaged. Therefore, the sludge needs to be fermented, and fermentation bacteria are added into the sludge, wherein the fermentation bacteria are bacillus, such as bacillus subtilis, bacillus megaterium and the like. Fermenting the sludge for 24 to 48 hours at 30 to 37 ℃ by using the fermentation tubes to obtain the fermented sludge. Before fermentation, the sludge is sterilized, and the purposes of removing harmful bacteria in the sludge, reducing the variety and the number of bacteria in the sludge and reducing competitors of zymophyte in subsequent steps are achieved; the air is introduced to eliminate harmful bacteria and provide oxygen for subsequent fermentation bacteria. Drying the fermented sludge and grinding the sludge into powder to obtain sludge micro powder, wherein the particle size of the sludge micro powder is in a nanometer range, and the particle size range is 3-15 nanometers. Adding deionized water, mixed biochar and polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring at a stirring speed of 500-1000 r/min (revolutions per minute) to obtain a mixed solution. The polysaccharide polypeptide biological potassium is a common product in the market. Under high-speed stirring, the mixed biochar adsorbs sludge micro powder, and part of the sludge micro powder and polysaccharide polypeptide biological potassium are stored in a porous structure. And evaporating the mixed solution to remove water to obtain a mixed solid, and performing compression granulation to obtain the heavy metal conditioner. The rest part of sludge micro powder and polysaccharide polypeptide biological potassium are dispersed on the surface of the mixed biological carbon. In use, the heavy metal conditioner is applied to the soil. In the mixed biochar, carbon is the element with the highest content, and the carbon in the mixed biochar mainly comprises a form which is stable in structure and difficult to degrade, such as organic carbon forming a basic skeleton of a molecule, and also comprises a form which is unstable in chemical property and easy to degrade, such as inorganic carbon such as calcium carbonate. When crops absorb the fertilizer, firstly, inorganic carbon which is easy to degrade and sludge micro powder and polysaccharide polypeptide biological potassium which are attached to the surface of the mixed biochar are absorbed; the sludge micropowder and the polysaccharide polypeptide biological potassium in the porous structure are well preserved and slowly released in the soil to be absorbed by crops along with the passage of time, so that the fertility of the barren soil can be continuously improved, and the action time of the heavy metal conditioner is prolonged. Biochar generated by the oil tea shells and the fruit shells is coarse and hard, has larger particle size and high porosity and specific surface area; the biochar prepared from the straws is relatively finer, and the porosity and the specific surface area are relatively lower. If the oil-tea camellia shell and the oil-tea camellia shell are independently adopted, the capacity of adsorbing sludge micro powder and polysaccharide polypeptide biological potassium of the mixed biochar is high, but most of carbon elements in the oil-tea camellia shell and the oil-tea camellia shell are in a form difficult to degrade, so that few carbon elements which can be absorbed by crops at the earlier stage and are easy to degrade are generated; so that the straw is added into the mixed biochar. The straw biochar is relatively fine and is easier to degrade, and can provide enough carbon source for crops in the early period. The adsorption capacity of the straw biochar is weak relative to that of oil-tea camellia shells and fruit shell biochar, so that the straw biochar can release sludge micropowder and polysaccharide polypeptide biological potassium more easily relative to the oil-tea camellia shells and the fruit shell biochar in the earlier stage of using the heavy metal conditioner, and when the sludge micropowder and the polysaccharide polypeptide biological potassium are released by the mixed biochar, the release process is staged and hierarchical, and the soil fertility can be continuously improved. Free heavy metal ions in the soil are easily absorbed by crops, when the mixed biochar is applied to the soil, the mixed biochar is alkaline, the physicochemical environment of the soil is effectively regulated, the pH value of the soil is increased, the heavy metal ions are easy to become hydroxide precipitates, the pH value is increased, the electronegativity of soil colloid is stronger, the antagonism between the heavy metal and alkaline particles is enhanced, and the bioavailability of the heavy metal ions in the soil is reduced. Meanwhile, the mixed biochar has a highly aromatic structure and contains a large number of oxygen-containing groups, so that the mixed biochar has good adsorption property and stability, further the mixed activated carbon can strongly adsorb free heavy metals in soil and influence the mobility of the heavy metals, and the absorption of crops to the heavy metals is reduced.
Preferably, the heavy metal conditioner comprises the following raw materials in percentage by mass: 60 to 70 parts of oil tea shell, 30 to 50 parts of fruit shell, 20 to 40 parts of straw, 30 to 60 parts of sludge and 10 to 20 parts of polysaccharide polypeptide biological potassium.
Preferably, the temperature for heating and sterilizing is 75-80 ℃.
Preferably, the fermentation bacteria are of the genus bacillus.
Preferably, the particle size of the sludge micro powder is nano-scale.
Preferably, the stirring speed in the preparation of the mixed solution is 500-1000 r/min.
Preferably, the water content of the mixed solid is 0.5 to 1 percent.
Has the advantages that: the novel heavy metal conditioner is prepared by combining agricultural organic garbage and industrial organic garbage, and is applied to barren soil, so that the soil fertility is improved, the crop yield is increased, and the ecological resource recycling is realized; the mixed activated carbon adsorbs free heavy metals in the soil, so that the migration of the heavy metals is influenced, and the absorption of the crops on the heavy metals is reduced; the novel heavy metal conditioner can continuously improve the fertility of barren soil and improve the action time.
Detailed Description
Example 1
A novel soil heavy metal conditioner comprises the following components in parts by weight: 60 parts of oil-tea camellia shells, 30 parts of fruit shells, 10 parts of straws, 30 parts of sludge and 11 parts of polysaccharide polypeptide biological potassium.
A preparation method of a novel soil heavy metal conditioner comprises the following steps: crushing 60 parts of oil-tea camellia shells, 30 parts of fruit shells and 10 parts of straws to obtain mixed powder, and pyrolyzing the mixed powder at 650 ℃ for 3 hours under the protection of inert gas to obtain mixed biochar; introducing air into 30 parts of sludge, heating and sterilizing at 75 ℃; cooling and maintaining the temperature at 35 ℃, adding bacillus subtilis and bacillus megatherium, and fermenting for 40 hours to obtain fermented sludge; drying the fermented sludge and grinding the dried sludge into powder to obtain sludge micro powder, wherein the particle size of the sludge micro powder is 3 to 5 nanometers; adding deionized water, mixed biochar and 11 parts of polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring at the stirring speed of 800r/min to obtain a mixed solution; and (3) evaporating the mixed solution to remove water to obtain a mixed solid, wherein the water content of the mixed solid is 0.5%, and pressing and granulating to obtain the heavy metal conditioner.
Example 2
A novel soil heavy metal conditioner comprises the following components in parts by weight: 65 parts of oil-tea camellia shells, 45 parts of fruit shells, 30 parts of straws, 45 parts of sludge and 15 parts of polysaccharide polypeptide biological potassium.
A preparation method of a novel soil heavy metal conditioner comprises the following steps: crushing 65 parts of camellia oleifera shells, 45 parts of fruit shells and 30 parts of straws to obtain mixed powder, and pyrolyzing the mixed powder for 2 hours at 700 ℃ under the protection of inert gas to obtain mixed biochar; introducing air into 45 parts of sludge, heating and sterilizing, wherein the heating and sterilizing temperature is 80 ℃; cooling and maintaining at 37 ℃, adding bacillus subtilis, and fermenting for 48 hours to obtain fermented sludge; drying the fermented sludge and grinding the dried sludge into powder to obtain sludge micro powder, wherein the particle size of the sludge micro powder is 5 to 8 nanometers; adding deionized water, mixed biochar and 15 parts of polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring at the stirring speed of 600r/min to obtain a mixed solution; and (3) evaporating the mixed solution to remove water to obtain a mixed solid, wherein the water content of the mixed solid is 0.6%, and pressing and granulating to obtain the heavy metal conditioner.
Example 3
A novel soil heavy metal conditioner comprises the following components in parts by weight: 70 parts of oil-tea camellia shells, 30 parts of fruit shells, 40 parts of straws, 30 parts of sludge and 20 parts of polysaccharide polypeptide biological potassium.
A preparation method of a novel soil heavy metal conditioner comprises the following steps: crushing 70 parts of oil-tea camellia shells, 30 parts of fruit shells and 40 parts of straws to obtain mixed powder, and pyrolyzing the mixed powder at 680 ℃ for 2.5 hours under the protection of inert gas to obtain mixed biochar; introducing air into 30 parts of sludge, heating and sterilizing at 75 ℃; cooling and maintaining the temperature at 35 ℃, adding bacillus megaterium, and fermenting for 48 hours to obtain fermented sludge; drying the fermented sludge and grinding the dried sludge into powder to obtain sludge micropowder, wherein the particle size of the sludge micropowder is 10 to 15 nanometers; adding deionized water, mixed biochar and 20 parts of polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring at the stirring speed of 1000r/min to obtain a mixed solution; and (3) evaporating the mixed solution to remove water to obtain a mixed solid, wherein the water content of the mixed solid is 1%, and pressing and granulating to obtain the heavy metal conditioner.
Example 4
A novel soil heavy metal conditioner comprises the following components in parts by weight: 70 parts of oil-tea camellia shells, 50 parts of fruit shells, 40 parts of straws, 60 parts of sludge and 15 parts of polysaccharide polypeptide biological potassium.
A preparation method of a novel soil heavy metal conditioner comprises the following steps: crushing 70 parts of oil-tea camellia shells, 50 parts of fruit shells and 40 parts of straws to obtain mixed powder, and pyrolyzing the mixed powder for 2.5 hours at 690 ℃ under the protection of inert gas to obtain mixed biochar; introducing air into 60 parts of sludge, heating and sterilizing at 75 ℃; cooling and maintaining the temperature at 30 ℃, adding bacillus subtilis and bacillus megatherium, and fermenting for 30 hours to obtain fermented sludge; drying the fermented sludge and grinding the dried sludge into powder to obtain sludge micro powder, wherein the particle size of the sludge micro powder is 5 to 8 nanometers; adding deionized water, mixed biochar and 15 parts of polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring at the stirring speed of 700r/min to obtain a mixed solution; and (3) evaporating the mixed solution to remove water to obtain a mixed solid, wherein the water content of the mixed solid is 0.5%, and pressing and granulating to obtain the heavy metal conditioner.
Example 5
A novel soil heavy metal conditioner comprises the following components in parts by weight: 66 parts of oil-tea camellia shell, 35 parts of fruit shell, 20 parts of straw, 30 parts of sludge and 10 parts of polysaccharide polypeptide biological potassium.
A preparation method of a novel soil heavy metal conditioner comprises the following steps: crushing 66 parts of oil-tea camellia shells, 35 parts of fruit shells and 20 parts of straws to obtain mixed powder, and pyrolyzing the mixed powder at 600 ℃ for 3 hours under the protection of inert gas to obtain mixed biochar; introducing air into 30 parts of sludge, heating and sterilizing at 80 ℃; cooling and maintaining at 37 ℃, adding bacillus subtilis, and fermenting for 40 hours to obtain fermented sludge; drying the fermented sludge and grinding the dried sludge into powder to obtain sludge micro powder, wherein the particle size of the sludge micro powder is 8 to 12 nanometers; adding deionized water, mixed biochar and 10 parts of polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring at the stirring speed of 800r/min to obtain a mixed solution; and (3) evaporating the mixed solution to remove water to obtain a mixed solid, wherein the water content of the mixed solid is 0.5%, and pressing and granulating to obtain the heavy metal conditioner.
Example 6
A novel soil heavy metal conditioner comprises the following components in parts by weight: 60 parts of oil-tea camellia shells, 50 parts of fruit shells, 40 parts of straws, 30 parts of sludge and 10 parts of polysaccharide polypeptide biological potassium.
A preparation method of a novel soil heavy metal conditioner comprises the following steps: crushing 60 parts of oil-tea camellia shells, 50 parts of fruit shells and 40 parts of straws to obtain mixed powder, and pyrolyzing the mixed powder for 2 hours at 700 ℃ under the protection of inert gas to obtain mixed biochar; introducing air into 30 parts of sludge, heating and sterilizing at 75 ℃; cooling and maintaining at 37 ℃, adding bacillus subtilis and bacillus megaterium, and fermenting for 30 hours to obtain fermented sludge; drying the fermented sludge and grinding the dried sludge into powder to obtain sludge micro powder, wherein the particle size of the sludge micro powder is 6 to 9 nanometers; adding deionized water, mixed biochar and 10 parts of polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring at the stirring speed of 750r/min to obtain a mixed solution; and (3) evaporating the mixed solution to remove water to obtain a mixed solid, wherein the water content of the mixed solid is 0.5%, and pressing and granulating to obtain the heavy metal conditioner.
Claims (8)
1. The novel soil heavy metal conditioner is characterized by comprising the following components in parts by mass:
60-70 parts of oil tea shells, 30-50 parts of fruit shells, 20-40 parts of straws, 30-60 parts of sludge and 10-20 parts of polysaccharide polypeptide biological potassium.
2. The preparation method of the novel soil heavy metal conditioner is characterized by comprising the following steps:
crushing oil tea shells, fruit shells and straws to obtain mixed powder, and pyrolyzing the mixed powder for 2 to 3 hours at the temperature of 600 to 700 ℃ under the protection of inert gas to obtain mixed biochar;
introducing air into the sludge, heating and sterilizing; cooling and maintaining at 30 to 37 ℃, adding zymophyte, and fermenting for 24 to 48 hours to obtain fermented sludge;
drying the fermented sludge and grinding the sludge into powder to obtain sludge micro powder;
adding deionized water, mixed biochar and polysaccharide polypeptide biological potassium into the sludge micro powder, and uniformly stirring to obtain a mixed solution;
and evaporating the mixed solution to remove water to obtain a mixed solid, and performing compression granulation to obtain the heavy metal conditioner.
3. The preparation method of the novel soil heavy metal conditioner as claimed in claim 2, wherein the heavy metal conditioner comprises the following raw materials in percentage by mass: 60 to 70 parts of oil tea shell, 30 to 50 parts of fruit shell, 20 to 40 parts of straw, 30 to 60 parts of sludge and 10 to 20 parts of polysaccharide polypeptide biological potassium.
4. The preparation method of the novel soil heavy metal conditioner as claimed in claim 2, wherein the temperature rise sterilization temperature is 75-80 ℃.
5. The method for preparing a novel soil heavy metal conditioner as claimed in claim 2, wherein the fermentation bacteria are Bacillus.
6. The preparation method of the novel soil heavy metal conditioner as claimed in claim 2, wherein the particle size of the sludge micropowder is nano-scale.
7. The preparation method of the novel soil heavy metal conditioner as claimed in claim 2, wherein the stirring speed in the preparation of the mixed solution is 500-1000 r/min.
8. The preparation method of the novel soil heavy metal conditioner as claimed in claim 2, wherein the water content of the mixed solid is 0.5-1%.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107282625A (en) * | 2017-08-17 | 2017-10-24 | 北京高能时代环境技术股份有限公司 | A kind of heavy-metal contaminated soil renovation agent and its application and the method for repairing polluted soil |
| CN108728107A (en) * | 2018-05-25 | 2018-11-02 | 合肥慧谷农业科技有限公司 | A kind of soil conditioner and preparation method thereof handling heavy metal |
| CN110627574A (en) * | 2018-06-21 | 2019-12-31 | 西北农林科技大学 | Biochar organic compound soil curing modifier and preparation method and application thereof |
| CN113024286A (en) * | 2021-03-26 | 2021-06-25 | 青海省农林科学院 | Modified biochar, biochar-based organic fertilizer and preparation method thereof |
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2022
- 2022-06-30 CN CN202210757675.5A patent/CN115180992A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107282625A (en) * | 2017-08-17 | 2017-10-24 | 北京高能时代环境技术股份有限公司 | A kind of heavy-metal contaminated soil renovation agent and its application and the method for repairing polluted soil |
| CN108728107A (en) * | 2018-05-25 | 2018-11-02 | 合肥慧谷农业科技有限公司 | A kind of soil conditioner and preparation method thereof handling heavy metal |
| CN110627574A (en) * | 2018-06-21 | 2019-12-31 | 西北农林科技大学 | Biochar organic compound soil curing modifier and preparation method and application thereof |
| CN113024286A (en) * | 2021-03-26 | 2021-06-25 | 青海省农林科学院 | Modified biochar, biochar-based organic fertilizer and preparation method thereof |
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