CN114350372A - Humic acid low-temperature activated mineral powder, preparation method thereof and application of mineral powder as soil conditioner - Google Patents
Humic acid low-temperature activated mineral powder, preparation method thereof and application of mineral powder as soil conditioner Download PDFInfo
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Abstract
The invention belongs to the technical field of soil improvement, and relates to humic acid low-temperature activated mineral powder, a preparation method thereof and application of the humic acid low-temperature activated mineral powder as a soil conditioner. The humic acid low-temperature activated mineral powder comprises an ore raw material and humic acid, wherein the ore raw material and the humic acid are mixed and then calcined at a low temperature. The preparation method of the humic acid low-temperature activated mineral powder comprises the steps of mixing ore raw material powder and a humic acid extracting solution of lignite or weathered coal, and then calcining and activating at the temperature of 300-400 ℃ to obtain the humic acid low-temperature activated mineral powder. The soil conditioner has the advantages that the activated elements are absorbed and utilized in the season of crops, the slow-release elements and the chelating elements have slow-release performance, and the soil conditioner can be used for improving the physicochemical property of soil, effectively improving the agronomic characters of the Shanghai green, improving the yield of the Shanghai green, continuously conditioning the soil and keeping the fertility of the soil.
Description
Technical Field
The invention belongs to the technical field of soil improvement, and relates to humic acid low-temperature activated mineral powder, a preparation method thereof and application of the humic acid low-temperature activated mineral powder as a soil conditioner.
Background
The usage amount of chemical fertilizers and chemical pesticides is increasing year by year, the agricultural ecological environment of China is gradually worsened, the soil quality is reduced, and the Chinese agriculture is more and more threatened, and in order to improve the soil quality and strengthen the soil function, the structure and the fertility attribute of the soil need to be conditioned. In addition, soil in south China is acidic in nature, and the acidification process is accelerated by scouring of acid rain caused by production and life of human beings, and the acid rain can accelerate the loss of mineral nutrient elements of the soil; changes the soil structure, leads to soil impoverishment, and influences the normal development of plants. It is therefore desirable to provide suitable soil conditioners that improve soil quality and maintain soil fertility.
Disclosure of Invention
In order to overcome the defects of the prior art, the first object of the invention is to provide the humic acid low-temperature activated mineral powder which is rich in various medium and trace elements and has the characteristics of partial activation and partial slow release.
The second purpose of the invention is to provide a preparation method of humic acid low-temperature activated mineral powder.
The third purpose of the invention is to provide an application of humic acid low-temperature activated mineral powder, which can be used as a soil conditioner or an additive of the soil conditioner to improve the pH value of soil and maintain the soil fertility.
The first purpose of the invention can be achieved by adopting the following technical scheme:
the low-temperature humic acid activated mineral powder is characterized by comprising an ore raw material and humic acid, wherein the mass ratio of the ore raw material to the humic acid is 1-120: 1; and mixing the ore raw material and humic acid, and calcining at low temperature to obtain the humic acid low-temperature activated mineral powder.
Further, the ore raw material is one or a composition of more than two of ground phosphate rock, serpentine, phosphate tailings, silica, dolomite, olivine, manganese boracite and ilmenite.
The second purpose of the invention can be achieved by adopting the following technical scheme:
a preparation method of humic acid low-temperature activated mineral powder comprises the following steps:
s1, adding weathered coal or lignite into an alkaline solution or an acidic solution for reaction to obtain a mixed solution;
s2, adding the ore raw material into the mixed liquid in the step S1, and stirring the mixture to a semi-flowing state to obtain a mixture;
s3, placing the mixture obtained in the step S2 in a muffle furnace at the temperature of 300 ℃ and 400 ℃ for calcining and activating for 1-3h to obtain the humic acid low-temperature activated mineral powder.
Further, the preparation method of the humic acid low-temperature activated mineral powder further comprises S4, wherein S4 is that the calcined product of the step S3 is cooled to room temperature and then ground and crushed to 60-80 meshes.
Further, the weathered coal or lignite is ground particles, and the ore raw material is ground particles.
Further, the concentration of the alkaline solution or the acidic solution in the step S1 is 1% to 5%.
Further, the ratio of the atomized coal to the alkaline solution or the acidic solution in the step S1 is 1:3-5 by mass, the reaction temperature is 20-30 ℃, and the reaction time is 1-3 h.
Further, in the step S2, the mass of the ore material is 2 to 4 times the mass of the mixed solution in the step S1.
The third purpose of the invention can be achieved by adopting the following technical scheme:
the application of the humic acid low-temperature activated mineral powder in preparing the soil conditioner is characterized in that the humic acid low-temperature activated mineral powder is directly used as the soil conditioner.
The application of humic acid low-temperature activated mineral powder in preparing a soil conditioner is characterized in that the humic acid low-temperature activated mineral powder is used as an additive for preparing the soil conditioner.
Compared with the prior art, the invention has the beneficial effects that:
(1) the humic acid low-temperature activated mineral powder is prepared by mixing an ore raw material and humic acid and calcining at low temperature, and has the elements in an activated state, is beneficial to the absorption and utilization of crops in season, has the elements in a slow release state and a chelating state, has a slow release performance and has a certain restoration performance on soil.
(2) According to the preparation method of the humic acid low-temperature activated mineral powder, low-temperature calcination is adopted, compared with ordinary calcination at the temperature of more than 800 ℃, a large amount of cost is saved, and instability of high-temperature calcination components is avoided; the mixed liquor obtained after the reaction of the lignite or weathered coal and the acid or alkali is directly mixed with the ore raw material for reaction and calcination, no additional separation treatment is needed, the preparation process is simplified, the activated product can be completely used in production, no by-product is generated, the lignite or weathered coal is fully utilized, and no additional influence is caused on the environment.
(3) The low-temperature activated mineral powder of humic acid of the invention is applied to the preparation of soil conditioner, the low-temperature activated mineral powder of humic acid is rich in a plurality of medium and trace elements, has chelation to various metal ions, and has partial activation and partial slow release effects; can be directly used for preparing a soil conditioner or used for the soil conditioner after being added with certain substances, improving the pH value of the soil and keeping the soil fertility.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
Activated humic acid in lignite or weathered coal has certain chelating performance on various metal ions in the ore raw material, partial metal ions and phosphorus elements can be activated in an acidic environment, then the ore raw material and the humic acid are further activated by calcination, the reaction is intensified, and the effects of partial activation and partial slow release are achieved; the activated humic acid and ore mixture is rich in various medium and trace elements and can be used for conditioning soil.
The humic acid low-temperature activated mineral powder comprises a mineral-containing raw material and humic acid, wherein the mass ratio of the mineral raw material to the humic acid is 10-120: 1; the ore raw material and humic acid are mixed and then calcined at low temperature.
As a further embodiment, the ore raw material is one or a combination of more than two of phosphate ore, serpentine, phosphate tailings, silica, dolomite, olivine, manganese boracite and ilmenite. The composition is not limited to the above composition, and in the prior art, ores, slag stones, soda industrial waste residues and the like from calcium magnesium fertilizer sources can be used as ore raw materials through treatments such as calcination, sedimentation and the like.
The humic acid low-temperature activated mineral powder can form an ion bridge after being applied to soil, and phosphorus and metal ions in the conventional fertilizer can be rapidly released through the ion bridge for crops to absorb and utilize under the condition that the crops need the phosphorus and the metal ions. And the humic acid low-temperature activated mineral powder can promote release of phosphorus and metal ions, and can continuously provide phosphorus and metal ions for crops through the ion bridge, so that the conventional fertilizer keeps higher fertilizer efficiency and maintains soil fertility, and therefore, the humic acid low-temperature activated mineral powder can be directly used as a soil conditioner and also can be used as an additive for preparing the soil conditioner. Wherein, the humic acid can be prepared by a conventional preparation method.
A preparation method of humic acid low-temperature activated mineral powder comprises the following steps:
s1, adding weathered coal or lignite into an alkaline solution or an acidic solution for reaction to obtain a mixed solution;
s2, adding the ore raw material into the mixed liquid in the step S1, and stirring the mixture to a semi-flowing state to obtain a mixture;
s3, placing the mixture obtained in the step S2 in a muffle furnace at the temperature of 300 ℃ and 400 ℃ for calcining and activating for 1-3h to obtain the humic acid low-temperature activated mineral powder.
Compared with the common calcination at the temperature of more than 800 ℃, the low-temperature calcination is adopted, so that a large amount of cost is saved, and the stability of components is difficult to ensure by high-temperature calcination; the low-temperature calcination enables the humic acid low-temperature activated mineral powder to have the activated elements, which are beneficial to the absorption and utilization of crops in season, and also have the slow-release elements and the chelated elements, which have the slow-release performance and certain restoration performance to soil.
Humic acid is extracted from lignite or weathered coal through acid or alkali, an extracting solution is mixed with an ore raw material, an additional treatment process is not needed, the preparation process is simplified, activated products can be completely used in production, no by-product is generated, lignite or weathered coal is fully utilized, the ore raw material is not additionally influenced, and environmental friendliness is achieved.
As a further embodiment, the method further comprises a step S4, after cooling the calcined product of the step S3 to room temperature, grinding and crushing the powder, preferably, the powder has 60-80 meshes. The ground humic acid low-temperature activated mineral powder can be used alone or mixed with other components for granulation.
In a further embodiment, the weathered coal or lignite is ground particles and the ore material is ground particles. The grinding can be carried out by a ceramic ball mill or a cement ball mill to obtain particles with a certain particle size, preferably, the size of the ore particles can be 80-120 meshes, and the particle size of the weathered coal or lignite can be 80-100 meshes.
As a further embodiment, the concentration of the alkaline solution or the acidic solution in the step S1 is 1% to 5%. The alkaline solution and the acidic solution can be solutions prepared from common alkali and acid, and preferably, the solubility of the alkaline solution and the acidic solution is 3%.
As a further embodiment, the ratio of the atomized coal to the alkaline solution or the acidic solution in step S1 is 1:3-5, the reaction temperature is 20-30 ℃, and the reaction time is controlled to be 1-3 h. Preferably, in the step S1, the ratio of the atomized coal to the alkaline solution or the acidic solution is 1:4, the reaction is carried out at normal temperature and 25 ℃, and the reaction time is controlled to be 2 h.
As a further embodiment, the amount of the ore material particles in the step S2 is 2 to 4 times the mass of the liquid after the reaction in the step S1. Humic acid in weathered coal or lignite can be calcined at low temperature along with ore raw materials for better activation. Preferably, the amount of the ore material particles in the step S2 is 3 times the mass of the solution after the reaction in the step S1.
The application of the humic acid low-temperature activated mineral powder in preparing the soil conditioner is characterized in that the humic acid low-temperature activated mineral powder is directly used as the soil conditioner. The humic acid low-temperature activated mineral powder can be directly added into soil or added into the soil together with a conventional fertilizer for conventional fertilization.
The application of humic acid low-temperature activated mineral powder in preparing a soil conditioner is characterized in that the humic acid low-temperature activated mineral powder is used as an additive for preparing the soil conditioner. The humic acid low-temperature activated mineral powder can be used as an additive and added into a soil conditioner to play a role in conditioning soil together with other components of the soil conditioner.
Example 1:
the preparation method of the humic acid low-temperature activated mineral powder comprises the following steps:
grinding ore raw materials of phosphate ore, serpentine, dolomite, silica and manganese boracite to 80-mesh particles according to the mass ratio of 4:2:2:0.5: 0.5; grinding weathered coal or lignite to 80 particles, adding the particles into 1 mass percent alkaline solution according to the solid-liquid ratio of 1:3 (mass ratio) and reacting for 1 hour at normal temperature; adding ore particles into the reacted solution according to the solid-liquid ratio of 2:1 (mass ratio), and stirring to a semi-flowing state; placing the mixture in a muffle furnace at 300 ℃, and calcining and activating for 1 h; the resulting mixture was cooled to room temperature, and then ground to 60 mesh.
Example 2:
the preparation method of the humic acid low-temperature activated mineral powder comprises the following steps:
grinding ore raw materials of phosphate ore, serpentine, phosphate tailings, silica, dolomite, olivine, manganese boracite and ilmenite to 120-mesh particles according to the mass ratio of 2:1:1:1:1: 0.5: 0.2; grinding weathered coal or lignite to 100-mesh particles, adding the particles into an acid solution with the mass percentage concentration of 3% according to the solid-liquid ratio of 1:4 (mass ratio) and reacting for 3 hours at normal temperature; adding ore particles into the reacted solution according to the solid-liquid ratio of 3:1 (mass ratio), and stirring to a semi-flowing state; placing the mixture in a muffle furnace at 350 ℃ for calcining and activating for 2 h; the resulting mixture was cooled to room temperature, and then ground to 80 mesh.
Example 3:
the preparation method of the humic acid low-temperature activated mineral powder comprises the following steps:
grinding ore raw materials of phosphate ore, serpentine, phosphate tailings, ilmenite and olivine to 100-mesh particles according to the mass ratio of 3:1:1:0.3: 1; grinding weathered coal or lignite to 90 particles, adding the particles into an acid solution with the mass percent concentration of 3% according to the solid-liquid ratio of 1:5 (mass ratio), and reacting for 2 hours at normal temperature; adding ore particles into the reacted solution according to the solid-liquid ratio of 4:1 (mass ratio), and stirring to a semi-flowing state; placing the mixture in a muffle furnace at 400 ℃, and calcining and activating for 3 h; the resulting mixture was cooled to room temperature, and then ground to 70 mesh.
Example 4:
the preparation method of the humic acid low-temperature activated mineral powder comprises the following steps:
grinding ore raw materials of phosphate ore, dolomite and ilmenite to 80-mesh particles according to the mass ratio of 2:1: 0.3; grinding weathered coal or lignite to 80 particles, adding the particles into an alkaline solution with the mass percent concentration of 3% according to the solid-liquid ratio of 1:3 (mass ratio), and reacting for 1 hour at normal temperature; adding ore particles into the reacted solution according to the solid-liquid ratio of 3:1 (mass ratio), and stirring to a semi-flowing state; placing the mixture in a muffle furnace at 330 ℃ for calcining and activating for 1.3 h; the resulting mixture was cooled to room temperature, and then ground to 60 mesh.
Example 5:
the preparation method of the humic acid low-temperature activated mineral powder comprises the following steps:
grinding ore raw materials of phosphate ore, dolomite, olivine and ilmenite to 90-mesh particles according to the mass ratio of 2:1:0.5: 0.3; grinding weathered coal or lignite to 90 particles, adding the particles into an alkaline solution with the mass percent concentration of 2% according to the solid-to-liquid ratio of 1:2.5 (mass ratio), and reacting at normal temperature for 2.5 hours; adding ore particles into the reacted solution according to the solid-liquid ratio of 3.5:1 (mass ratio), and stirring to a semi-flowing state; placing the mixture in a muffle furnace at 380 ℃ for calcining and activating for 2 h; the resulting mixture was cooled to room temperature, and then ground to 60 mesh.
The following are tests and results of the humic acid low-temperature activated mineral powder obtained by the invention as a soil conditioner, the crop object selected in the tests is Shanghai green, and the influence of the soil conditioner containing the humic acid low-temperature activated mineral powder on the quality and the physical and chemical properties of the Shanghai green is tested.
Test site: in a third-floor laboratory of Guangdong Laduo beautification Fertilizer Co., Ltd, the test soil is collected local garden soil, and the basic physicochemical properties of the test soil are shown in Table 1.
TABLE 1 test soil basic physicochemical Properties
Test work: shanghai Qing.
And (3) experimental design:
the pot experiment is adopted, an experimental group, a first control group and a second control group are arranged, each group is simultaneously provided with 4 pots, and each treatment design is as follows:
test groups: conventional fertilization + 2.0 g/pot of humic acid low-temperature activated mineral powder prepared in example 2;
control group 1: conventional fertilization;
control group 2: no fertilizer is applied.
Test and main cultivation management conditions:
uniformly mixing humic acid low-temperature activated mineral powder with soil before Shanghai green transplanting according to the proportion of 2g per pot; the compound fertilizer is used as a base fertilizer and is applied conventionally, 0.5 g/pot, a plastic flowerpot is adopted, the specification is 20cm x 18cm, and 1.5kg of soil is filled in each pot. Transplanting in 3 months and 15 days, and harvesting in 4 months and 20 days. During the test period, other management measures are consistent except for different first fertilization.
Measurement of test index
The agronomic characters are measured by measuring the plant height, the leaf number, the leaf color and the like of the Shanghai green in 4 months and 2 days and in 4 months and 20 days. The number of the blades is counted by taking the complete expansion as a standard, the plant height is measured by a tape measure at the root base part to the top end position in the natural state, and the SPAD value is measured by a leaf green instrument. And after the harvest is finished, measuring the soil sample.
Results and analysis
The effect of different treatments on the agronomic traits of shanghai green is shown in table 2.
TABLE 2 Effect of different treatments on the agronomic traits of Shanghai Green
During collection, the whole growth vigor, plant height and leaf color of the leaf lettuce are shown to be more than an experimental group and more than a control group 1 and more than a control group 2 in appearance. During collection, the overground fresh weight of each plant also presents that the increase rate of the fresh weight of each plant of the experimental group is 10.4 percent compared with that of the control group 1 and is more than that of the control group 2, and the overground fresh weight of each plant of the experimental group is remarkably different from that of the control group 2 by 29.4 percent. The effect of different treatments on the physicochemical properties of the soil, the results are shown in table 3.
TABLE 3 variation of physicochemical Properties of soil after planting Shanghai green by different treatments
| Item | Organic matter g/kg | Alkaline hydrolysis nitrogen mg/kg | Effective phosphorus mg/kg | Quick-acting potassium mg/kg | pH |
| Foundation soil | 8.85 | 124.5 | 8.7 | 78.6 | 5.2 |
| Experimental group | 8.96 | 112.5 | 8.9 | 79.5 | 5.5 |
| Control group 1 | 8.75 | 106.5 | 8.6 | 77.4 | 5.1 |
| Control group 2 | 8.03 | 96.8 | 7.2 | 71.2 | 5.13 |
As can be seen from Table 3, different groups have certain influence on the physicochemical properties of the soil, and the acidity of the soil is reduced and the content of organic matters is increased after the experimental group applies the humic acid low-temperature activated mineral powder soil conditioner. Compared with the basic soil, the soil pH of the experimental group applied with the humic acid low-temperature activated mineral powder soil conditioner is improved by 0.5, which shows that the soil pH can be improved by applying the alkaline raw material in the humic acid low-temperature activated mineral powder soil conditioner. After harvesting the Shanghai green, the nutrient content in the soil is reduced except nitrate nitrogen because part of nutrients in the soil are taken away by the growth of vegetables.
In order to further verify the conditioning effect of the humic acid low-temperature activated mineral powder soil conditioner on the physical and chemical properties of soil, the Shanghai green is planted for the second time in each group of soil where the Shanghai green is harvested without adding any fertilizer, and after harvesting is finished, soil samples are measured, and the results are shown in Table 4.
TABLE 4 variation of physicochemical Properties of soil after planting Shanghai green by different treatments
| Item | Organic matter g/kg | Alkaline hydrolysis nitrogen mg/kg | Effective phosphorus mg/kg | Quick-acting potassium mg/kg | pH |
| Foundation soil | 8.85 | 124.5 | 8.7 | 78.6 | 5.2 |
| Experimental group | 8.87 | 110.3 | 8.84 | 79.1 | 5.5 |
| Control group 1 | 8.62 | 92.5 | 8.48 | 75.8 | 5.1 |
| Control group 2 | 7.33 | 70.2 | 5.9 | 64.5 | 5.1 |
As can be seen from table 4, although the ore powder soil conditioner is planted twice, the acidity of the soil can still be reduced by adding the humic acid low-temperature activated ore powder soil conditioner to the experimental group; the nutrient content in the soil is reduced because part of nutrients in the soil can be taken away by the growth of vegetables, but the content of organic matters, alkaline-hydrolyzed nitrogen, available phosphorus and quick-acting potassium in an experimental group is reduced less than that of a control group 1 and a control group 2, and the content of the organic matters, the alkaline-hydrolyzed nitrogen, the available phosphorus and the quick-acting potassium in the experimental group can be kept equivalent to that of basic soil, which indicates that the humic acid low-temperature activated mineral powder soil conditioner is added to provide part of nutrients for the growth of the Shanghai green, and the content change of the planting in two times is not large, and indicates that the humic acid low-temperature activated mineral powder soil conditioner can also keep the fertility of the soil in a slow release mode.
Therefore, the humic acid-containing low-temperature activated mineral powder can be used as a soil conditioner to obviously reduce soil acidity, improve the agricultural shape of Shanghai Qing and obviously promote the yield. And can continuously condition the soil and maintain the fertility of the soil.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The low-temperature humic acid activated mineral powder is characterized by comprising an ore raw material and humic acid, wherein the mass ratio of the ore raw material to the humic acid is 10-120: 1; and mixing the ore raw material and humic acid, and calcining at low temperature to obtain the humic acid low-temperature activated mineral powder.
2. The humic acid low-temperature activated mineral powder according to claim 1, wherein the ore raw material is one or a composition of more than two of ground phosphate rock, serpentine, phosphate tailings, silica, dolomite, olivine, manganese boracite and ilmenite.
3. The method for preparing the humic acid low-temperature activated mineral powder according to claim 1 or 2, which is characterized by comprising the following steps:
s1, adding weathered coal or lignite into an alkaline solution or an acidic solution for reaction to obtain a mixed solution;
s2, adding the ore raw material into the mixed liquid in the step S1, and stirring the mixture to a semi-flowing state to obtain a mixture;
s3, placing the mixture obtained in the step S2 in a muffle furnace at the temperature of 300 ℃ and 400 ℃ for calcining and activating for 1-3h to obtain the humic acid low-temperature activated mineral powder.
4. The method for preparing humic acid low-temperature activated mineral powder according to claim 3, wherein,
the preparation method of the humic acid low-temperature activated mineral powder also comprises S4, wherein the calcined product obtained in the step S3 is cooled to room temperature, and then ground and crushed to 60-80 meshes, so that the humic acid low-temperature activated mineral powder is prepared.
5. The method for preparing humic acid low-temperature activated mineral powder according to claim 3, wherein,
the weathered coal or lignite is ground particles, and the ore raw material is ground particles.
6. The method for preparing the humic acid low-temperature activated mineral powder according to claim 3, wherein the concentration of the alkaline solution or the acidic solution in the step S1 is 1-5% by mass.
7. The method for preparing humic acid low-temperature activated mineral powder according to claim 3, wherein,
in the step S1, the ratio of the atomized coal to the alkaline solution or the acidic solution is 1:3-5 by mass, the reaction temperature is 20-30 ℃, and the reaction time is 1-3 h.
8. The method for preparing humic acid low-temperature activated mineral powder according to claim 3, wherein,
in the step S2, the mass of the ore material is 2 to 4 times the mass of the mixed solution in the step S1.
9. The application of the humic acid low-temperature activated mineral powder in the preparation of the soil conditioner in claim 1 or 2, wherein the humic acid low-temperature activated mineral powder is directly used as the soil conditioner.
10. The application of the humic acid low-temperature activated mineral powder in the preparation of the soil conditioner in claim 1 or 2, wherein the humic acid low-temperature activated mineral powder is used as an additive for preparing the soil conditioner.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115287079A (en) * | 2022-08-31 | 2022-11-04 | 宁夏大学 | Humic acid activated ground phosphate rock improvement saline-alkali soil and land fertility improvement method |
| CN116621647A (en) * | 2023-06-05 | 2023-08-22 | 山东农业大学 | Method for preparing humic acid slow-release trace element fertilizer by efficiently activating lignite through MOF derivative |
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- 2021-11-26 CN CN202111422377.2A patent/CN114350372A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115287079A (en) * | 2022-08-31 | 2022-11-04 | 宁夏大学 | Humic acid activated ground phosphate rock improvement saline-alkali soil and land fertility improvement method |
| CN115287079B (en) * | 2022-08-31 | 2024-04-26 | 宁夏大学 | Method for improving saline-alkali soil and improving soil fertility by using humic acid activated phosphate rock powder |
| CN116621647A (en) * | 2023-06-05 | 2023-08-22 | 山东农业大学 | Method for preparing humic acid slow-release trace element fertilizer by efficiently activating lignite through MOF derivative |
| CN116621647B (en) * | 2023-06-05 | 2024-03-29 | 山东农业大学 | Method for preparing humic acid slow-release trace element fertilizer by efficiently activating lignite through MOF derivative |
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