CN111807903A - Biochar-based corn fertilizer and preparation method thereof - Google Patents
Biochar-based corn fertilizer and preparation method thereof Download PDFInfo
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- CN111807903A CN111807903A CN202010681807.1A CN202010681807A CN111807903A CN 111807903 A CN111807903 A CN 111807903A CN 202010681807 A CN202010681807 A CN 202010681807A CN 111807903 A CN111807903 A CN 111807903A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/02—Superphosphates
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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
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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
- C05G3/70—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting wettability, e.g. drying agents
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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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- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
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Abstract
The invention belongs to the technical field of corn fertilizers and provides a biochar-based corn fertilizer and a preparation method thereof. The biochar-based corn fertilizer provided by the invention is prepared from the following raw materials in parts by weight: 13-22 parts of urea, 10-30 parts of phosphate fertilizer, 8-12 parts of potash fertilizer, 1.5-3.2 parts of biochar, 0.25-0.64 part of calcium chloride and 25-45 parts of organic fertilizer, wherein the biochar is made of shrub branches. The biochar-based corn fertilizer provided by the invention can efficiently adsorb and fix heavy metal elements such as cadmium (Cd), lead (Pb), chromium (Cr) and the like in soil, reduce the heavy metal content in corn grains, improve the safety of corn grains, also has the effects of retaining water and increasing fertilizer, reduces the volume weight of the soil, improves the soil structure and improves the corn yield.
Description
Technical Field
The invention relates to the technical field of corn fertilizers, in particular to a biochar-based corn fertilizer and a preparation method thereof.
Background
With the rapid development of economy in China, the heavy metal pollutants generated in industrial production are also obviously increased. Heavy metal pollution not only reduces soil fertility, but also influences crop growth and development and reduces crop yield. Corn is one of the most important grain crops in China, and along with the continuous improvement of the corn yield, the corn plays an increasingly prominent role in the grain safety in China. As an ecological cycle type, environment-friendly and renewable biological resource, corn occupies a very important position in national economic development of China. Therefore, since it is confirmed that heavy metals in the environment can enter the human body through the food chain and cause harm to human health, intensive research on the relationship between corn and soil heavy metals has been conducted. Cadmium is a heavy metal element with strong toxicity, and trace cadmium can cause DNA damage and metabolic disorder of corn cells, inhibit corn growth, reduce chlorophyll content, enable leaves to become yellow and green, and influence photosynthesis, thereby reducing corn yield; the absorption of the corn to the lead shows extremely strong concealment, the apparent disease of the plant is not shown even after a large amount of lead is absorbed, the harmful lead mainly enters the plant body through non-metabolism, and the absorption process is not influenced by the metabolism inhibition effect; the deleterious effects of chromium on maize growth are mainly due to its severe retardation of development as a seedling, reduced crop yield, and even plant death.
The biochar is used as a soil conditioner, has a fine pore structure, a large specific surface area and abundant surface functional groups, and has strong adsorption capacity on heavy metal ions. However, the adsorption mechanism of biochar is not clear at present, biochar is prepared from a wide range of raw materials, and different types of biochar have large element content difference and different adsorption effects on heavy metals due to different raw material sources.
Disclosure of Invention
The invention aims to provide a biochar-based corn fertilizer and a preparation method thereof for corn crops.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a biochar-based corn fertilizer which is prepared from the following raw materials in parts by weight: 13-22 parts of urea, 10-30 parts of phosphate fertilizer, 8-12 parts of potash fertilizer, 1.5-3.2 parts of biochar, 0.25-0.64 part of calcium chloride and 25-45 parts of organic fertilizer, wherein the biochar is made of shrub branches.
Preferably, the phosphate fertilizer is one or more of monoammonium phosphate, superphosphate and calcium magnesium phosphate.
Preferably, the potash fertilizer is one or more of potassium chloride, potassium sulfate and potassium carbonate.
Preferably, the shrubs comprise one or more of Chinese roses, rhododendrons, pyracanthas fortuneana and photinia serrulata.
Preferably, the organic fertilizer is one or more of silkworm excrement, chicken manure and humic acid.
The invention also provides a preparation method of the biochar-based corn fertilizer, which comprises the following steps:
(1) crushing the raw material of the biochar, sieving the crushed raw material by a sieve with 10-35 meshes, taking undersize, and carrying out pyrolysis treatment to obtain the biochar;
(2) and mixing the prepared biochar with other raw materials according to the parts by weight to obtain the biochar-based corn fertilizer.
Preferably, the temperature of the pyrolysis treatment is 480-860 ℃, and the time of the pyrolysis treatment is 5-15 h.
Preferably, the pyrolysis treatment is in N2The reaction is carried out in an atmosphere.
Preferably, the temperature is reduced to 20-30 ℃ after the pyrolysis treatment, the biomass is sieved by a 100-200-mesh sieve, and undersize products are taken, namely the biochar.
The biochar-based corn fertilizer provided by the invention can efficiently adsorb and fix heavy metal elements such as cadmium (Cd), lead (Pb), chromium (Cr) and the like in soil, reduce the heavy metal content in corn grains, improve the safety of corn grains, also has the effects of retaining water and increasing fertilizer, reduces the volume weight of the soil, improves the soil structure and improves the corn yield.
Detailed Description
The invention provides a biochar-based corn fertilizer which is prepared from the following raw materials in parts by weight: 13-22 parts of urea, 10-30 parts of phosphate fertilizer, 8-12 parts of potash fertilizer, 1.5-3.2 parts of biochar, 0.25-0.64 part of calcium chloride and 25-45 parts of organic fertilizer, wherein the biochar is made of shrub branches.
In the invention, the biochar-based corn fertilizer is preferably prepared from the following raw materials in parts by weight: 13-22 parts of urea, preferably 15-20 parts of urea, and more preferably 17 parts of urea; 10-30 parts of phosphate fertilizer, preferably 15-25 parts, and more preferably 20 parts; 8-12 parts of a potassium fertilizer, preferably 9-11 parts, and further preferably 10 parts; 1.5-3.2 parts of biochar, preferably 2.0-2.8 parts, and more preferably 2.4 parts; 0.25-0.64 part of calcium chloride, preferably 0.35-0.51 part of calcium chloride, and more preferably 0.42 part of calcium chloride; 25-45 parts of organic fertilizer, preferably 30-40 parts, and more preferably 35 parts.
In the present invention, the raw material of the biochar is preferably branches of shrubs.
In the invention, the shrub preferably comprises one or more of China rose, rhododendron, pyracantha fortuneana and photinia, more preferably China rose and/or rhododendron, and still more preferably China rose.
In the present invention, the phosphate fertilizer is preferably one or more of monoammonium phosphate, superphosphate and calcium magnesium phosphate, more preferably monoammonium phosphate and/or superphosphate, and still more preferably monoammonium phosphate.
In the invention, the potash fertilizer is preferably one or more of potassium chloride, potassium sulfate and potassium carbonate, more preferably potassium chloride and/or potassium sulfate, and still more preferably potassium sulfate.
In the invention, the organic fertilizer is preferably one or more of silkworm excrement, chicken manure and humic acid, more preferably chicken manure and/or humic acid, and still more preferably humic acid.
The invention also provides a preparation method of the biochar-based corn fertilizer, which comprises the following steps:
(1) crushing the raw material of the biochar, sieving the crushed raw material by a sieve with 10-35 meshes, taking undersize, and carrying out pyrolysis treatment to obtain the biochar;
(2) and mixing the prepared biochar with other raw materials according to the parts by weight to obtain the biochar-based corn fertilizer.
When the biochar is prepared, the raw materials are firstly crushed, the sieved materials are sieved by a sieve with 10-35 meshes, and then undersize materials are taken for pyrolysis treatment, so that the biochar is obtained.
In the invention, after the raw materials are crushed, the raw materials are preferably sieved by a 10-35-mesh sieve, more preferably sieved by a 14-25-mesh sieve, and even more preferably sieved by a 18-mesh sieve.
In the invention, after the raw materials are crushed, the crushed raw materials are preferably dried and then sieved, wherein the drying temperature is preferably 50-105 ℃, more preferably 70-95 ℃, and more preferably 85 ℃; the drying time is preferably 12-24 hours, more preferably 15-20 hours, and still more preferably 18 hours.
In the invention, the temperature of the pyrolysis treatment is preferably 480-860 ℃, more preferably 500-800 ℃, and still more preferably 620-750 ℃; the time for the pyrolysis treatment is preferably 5-15 hours, more preferably 8-13 hours, and still more preferably 10 hours.
In the present invention, the pyrolysis treatment is carried out in a tube furnace.
In the invention, when the pyrolysis treatment is carried out in a tubular furnace, the heating rate is preferably 3-8 ℃/min, and more preferably 5 ℃/min; the cooling rate is preferably 10-20 ℃/min, and more preferably 15 ℃/min.
In the present invention, the pyrolysis treatment is preferably in N2The reaction is carried out in an atmosphere.
In the invention, the temperature is preferably reduced to 20-30 ℃ after the pyrolysis treatment, and then the pyrolysis treatment is preferably carried out by sieving with a 100-200 mesh sieve, further preferably by sieving with a 120-170 mesh sieve, and further preferably by sieving with a 140 mesh sieve.
After the biochar is prepared, the biochar and other raw materials are mixed according to the parts by weight, and the biochar-based corn fertilizer is obtained.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The embodiment provides a biochar-based corn fertilizer which is prepared by mixing 17 parts of urea, 20 parts of phosphate fertilizer (ammonium dihydrogen phosphate is used as phosphate fertilizer), 10 parts of potash fertilizer (potassium sulfate is used as potash fertilizer), 2.4 parts of biochar, 0.42 part of calcium chloride and 35 parts of organic fertilizer (humic acid is used as organic fertilizer). Wherein the biochar is prepared from Chinese rose branches serving as raw materials, leaves and flowers of the Chinese rose branches collected after Chinese rose flowers are trimmed are removed, the Chinese rose branches are crushed and sieved by a 18-mesh sieve, undersize products are taken and dried for 18 hours at 85 ℃, and then the dried Chinese rose branches are placed into a tube furnace and placed in a N-shaped furnace2Carrying out pyrolysis treatment in the atmosphere, heating to 680 ℃ at the speed of 5 ℃/min during pyrolysis, preserving heat for 10h, and then cooling to 25 ℃ at the speed of 15 ℃/min. And taking out the biomass after the temperature reduction is finished, and sieving the biomass by a 140-mesh sieve to obtain undersize products, namely the biochar.
Example 2
The embodiment provides a biochar-based corn fertilizer which is prepared by mixing 22 parts of urea, 15 parts of phosphate fertilizer (phosphate fertilizer is calcium superphosphate), 11 parts of potash fertilizer (potash fertilizer is potassium chloride), 2.0 parts of biochar, 0.64 part of calcium chloride and 30 parts of organic fertilizer (organic fertilizer is chicken manure). Wherein the biochar is prepared from branch of Rhododendron simsii by pulverizing collected branch of Rhododendron simsii, sieving with 10 mesh sieve, oven drying the undersize at 105 deg.C for 12 hr, and placing in a tube furnace under N atmosphere2Carrying out pyrolysis treatment in the atmosphere, heating to 750 ℃ at the speed of 8 ℃/min during pyrolysis, preserving heat for 8h, and then cooling to 20 ℃ at the speed of 10 ℃/min. And taking out the biomass after the temperature reduction is finished, and sieving the biomass by a 120-mesh sieve to obtain undersize products, namely the biochar.
Example 3
The embodiment provides a biochar-based corn fertilizer which is prepared by mixing 13 parts of urea, 30 parts of phosphate fertilizer (the phosphate fertilizer is a mixed phosphate fertilizer formed by mixing ammonium dihydrogen phosphate and calcium magnesium phosphate according to a mass ratio of 1: 1), 8 parts of potassium fertilizer (the potassium fertilizer is a mixed potassium fertilizer formed by mixing potassium sulfate and potassium carbonate according to a mass ratio of 5: 3), 2.8 parts of biochar, 0.35 part of calcium chloride and 25 parts of organic fertilizer (the organic fertilizer is humic acid). Wherein the biochar is prepared from pyracantha fortuneana branches, the collected pyracantha fortuneana branches are crushed and sieved by a 25-mesh sieve, undersize materials are dried for 20 hours at 50 ℃, and then the undersize materials are put into a tube furnace and placed in a N-shaped furnace2Pyrolysis under atmosphereAnd (3) treating, namely heating to 480 ℃ at the speed of 3 ℃/min during pyrolysis, preserving heat for 13h, and then cooling to 30 ℃ at the speed of 20 ℃/min. And after the temperature is reduced, taking out the biomass charcoal, and sieving the biomass charcoal with a 170-mesh sieve to obtain undersize products, namely the biomass charcoal.
Example 4
The embodiment provides a biochar-based corn fertilizer which is prepared by mixing 15 parts of urea, 10 parts of phosphate fertilizer (phosphate fertilizer is ammonium dihydrogen phosphate), 12 parts of potash fertilizer (potash fertilizer is mixed potash fertilizer formed by mixing potassium sulfate, potassium carbonate and potassium chloride according to the mass ratio of 1:1: 1), 1.5 parts of biochar, 0.25 part of calcium chloride and 45 parts of organic fertilizer (organic fertilizer is silkworm excrement). The biochar is prepared from photinia fraseri branches serving as raw materials, leaves of the photinia fraseri branches collected after the photinia fraseri branches are trimmed are removed, the photinia fraseri branches are crushed and sieved by a 14-mesh sieve, undersize materials are taken and dried for 24 hours at 95 ℃, and then the dried materials are put into a tube furnace and placed in a N-type furnace2Carrying out pyrolysis treatment in the atmosphere, heating to 500 ℃ at the speed of 6 ℃/min during pyrolysis, preserving heat for 5h, and then cooling to 20 ℃ at the speed of 15 ℃/min. And taking out the biomass after the temperature reduction is finished, and sieving the biomass by a 200-mesh sieve to obtain undersize products, namely the biochar.
Example 5
The embodiment provides a biochar-based corn fertilizer which is prepared by mixing 20 parts of urea, 25 parts of phosphate fertilizer (phosphate fertilizer is calcium superphosphate), 9 parts of potash fertilizer (potash fertilizer is potassium carbonate), 3.2 parts of biochar, 0.45 part of calcium chloride and 40 parts of organic fertilizer (organic fertilizer is mixed organic fertilizer formed by mixing chicken manure and humic acid according to the mass ratio of 1: 1). Wherein the biochar is prepared from branches of China rose and rhododendron as raw materials, leaves and flowers of the branches of China rose collected after pruning the China rose are removed and crushed together with the branches of rhododendron, the crushed branches are sieved by a 35-mesh sieve, undersize materials are dried for 15 hours at 70 ℃, and then the dried undersize materials are put into a tube furnace and placed in an N-shaped furnace2Carrying out pyrolysis treatment in the atmosphere, heating to 860 ℃ at the speed of 5 ℃/min during pyrolysis, preserving heat for 15h, and then cooling to 25 ℃ at the speed of 15 ℃/min. And taking out the biomass charcoal after the temperature is reduced, and sieving the biomass charcoal with a 100-mesh sieve to obtain undersize products, namely the biomass charcoal.
Example 6
The embodiment provides a biochar-based corn fertilizer which comprises 17 parts of urea, 20 parts of phosphate fertilizer (the phosphate fertilizer is ammonium dihydrogen phosphate), 10 parts of potash fertilizer (the potash fertilizer is potassium sulfate), 2.4 parts of biochar, 0.42 part of calcium chloride and 35 parts of organic fertilizer(the organic fertilizer is humic acid). Wherein the biochar is prepared from Chinese rose, rhododendron, pyracantha fortuneana and photinia serrulata branches, various branches are mixed and crushed, are sieved by a 18-mesh sieve, undersize materials are dried for 18h at 85 ℃, and then are put into a tube furnace to be heated in a N-shaped furnace2Carrying out pyrolysis treatment in the atmosphere, heating to 680 ℃ at the speed of 5 ℃/min during pyrolysis, preserving heat for 10h, and then cooling to 25 ℃ at the speed of 15 ℃/min. And taking out the biomass after the temperature reduction is finished, and sieving the biomass by a 140-mesh sieve to obtain undersize products, namely the biochar.
Comparative example 1
A corn fertilizer was obtained by replacing the self-made biochar of the present invention in example 1 with commercially available biochar.
Experimental example 1
Soil samples are taken before sowing for detection, the pH of the soil is 6.5-7.5, the water content is 10.32%, the organic content is 3.81g/kg, and the volume weight of the soil is 1.120g/cm3The Cd content is 5.73mg/kg, the Pb content is 552mg/kg, and the Cr content is 813 mg/kg. It can be known that the soil has low water content, deficient organic matter content, high volume weight and serious pollution of heavy metals Cd, Pb and Cr.
In the experiment, sowing is carried out in the middle and last ten days of 4 months, soil plowing is carried out 5 days before sowing, the biochar-based corn fertilizer of examples 1-6 and the corn fertilizer of comparative example 1 are respectively and uniformly applied according to 150 kg/mu before plowing, and then additional fertilization and field management are carried out according to a conventional method. And setting a contrast, applying the nitrogen-phosphorus-potassium compound fertilizer (no biochar is added in the fertilizer) according to a conventional method, and keeping the field management consistent with other treatments. And (4) harvesting the corns after the corns are ripe in 9 months, and calculating the yield. And (3) after the corn is harvested, taking a soil sample to detect the soil condition, wherein the result is shown in table 1, and the result is shown in table 2.
TABLE 1 soil conditions after sowing
| Examples | pH | Water content | Organic matter g/kg | Volume weight g/cm3 |
| Example 1 | 6.8 | 14.32％ | 36.98 | 0.785 |
| Example 2 | 7.0 | 13.51％ | 30.25 | 0.889 |
| Example 3 | 6.5 | 12.98％ | 32.12 | 0.854 |
| Example 4 | 7.2 | 14.02％ | 29.86 | 0.789 |
| Example 5 | 6.9 | 15.01％ | 34.21 | 0.879 |
| Example 6 | 6.8 | 14.35％ | 35.12 | 0.798 |
| Comparative example 1 | 7.3 | 10.85％ | 18.65 | 0.998 |
| Control | 7.0 | 9.54％ | 2.53 | 1.121 |
The detection results in the table 1 show that the water content of the soil is 12.98-15.01% by applying the biochar-based corn fertilizer provided by the invention, 2.13-4.16% by comparing with the proportion 1 and 3.44-5.47% by comparing with the comparison; the organic matter content of the soil reaches 29.86-36.98 g/kg, which is 11.21-18.33 g/kg higher than that of the comparison 1 and 27.33-34.45 g/kg higher than that of the comparison; the volume weight of the soil is reduced to 0.785 to 0.889g/cm3. Therefore, the biochar-based corn fertilizer provided by the invention can obviously improve the organic matter content of soil, improve the water content of the soil and reduce the volume weight of the soil.
TABLE 2 heavy metal content and yield in corn seeds
As can be seen from Table 2, when the biochar-based corn fertilizer is applied to the soil polluted by heavy metals, the heavy metals Cd, Pb and Cr in the soil can be efficiently and stably adsorbed and fixed. Analyzing the data in the table 2, it can be seen that the average Cd content in the corn kernels of the examples-6 is 0.0092mg/kg, which is reduced by 81.60% in average compared with the comparison 1 and by 97.12% in comparison; the average Pb content is 0.0225mg/kg, the average ratio is reduced by 62.50% compared with the ratio 1, and the average ratio is reduced by 95.67% compared with the control; the average Cr content is 0.042mg/kg, which is reduced by 95.12% compared with the comparison example 1 and 96.58% compared with the comparison example. Therefore, the biochar-based corn fertilizer provided by the invention greatly reduces the heavy metal content in corn kernels and ensures the safety of the corn kernels. In addition, the yield of the corn can be obviously improved by planting the corn by using the biochar-based corn fertilizer provided by the invention, and compared with the corn yield of a control, the yield of the corn is improved by 1.8 times.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The biochar-based corn fertilizer is characterized by being prepared from the following raw materials in parts by weight: 13-22 parts of urea, 10-30 parts of phosphate fertilizer, 8-12 parts of potash fertilizer, 1.5-3.2 parts of biochar, 0.25-0.64 part of calcium chloride and 25-45 parts of organic fertilizer, wherein the biochar is made of shrub branches.
2. The biochar-based corn fertilizer as claimed in claim 1, characterized in that the phosphate fertilizer is one or more of monoammonium phosphate, superphosphate and calcium magnesium phosphate.
3. The biochar-based corn fertilizer as claimed in claim 1, wherein the potash fertilizer is one or more of potassium chloride, potassium sulfate and potassium carbonate.
4. The biochar-based corn fertilizer as claimed in claim 1, wherein the shrubs comprise one or more of roses, rhododendrons, pyracanthas fortunei and photinia serrulata.
5. The biochar-based corn fertilizer as claimed in claim 1, wherein the organic fertilizer is one or more of silkworm excrement, chicken manure and humic acid.
6. The preparation method of the biochar-based corn fertilizer as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
(1) crushing the raw material of the biochar, sieving the crushed raw material by a sieve with 10-35 meshes, taking undersize, and carrying out pyrolysis treatment to obtain the biochar;
(2) and mixing the prepared biochar with other raw materials according to the parts by weight to obtain the biochar-based corn fertilizer.
7. The method for preparing the biochar-based corn fertilizer as claimed in claim 6, wherein the temperature of the pyrolysis treatment is 480-860 ℃, and the time of the pyrolysis treatment is 5-15 hours.
8. The method of claim 7, wherein the pyrolysis treatment is performed in N2The reaction is carried out in an atmosphere.
9. The preparation method of the biochar-based corn fertilizer as claimed in claim 6, wherein the temperature is reduced to 20-30 ℃ after the pyrolysis treatment, the biochar is obtained after the temperature is reduced and the biochar is sieved by a 100-200-mesh sieve.
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| CN1134927A (en) * | 1996-03-29 | 1996-11-06 | 辽宁金盾经济贸易公司 | Carbon-based multiple high effect composite fertilizer and process for producing same |
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Application publication date: 20201023 |
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