CN113968760A - Preparation process of multi-element potassium fulvate sulfate fertilizer - Google Patents
Preparation process of multi-element potassium fulvate sulfate fertilizer Download PDFInfo
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- CN113968760A CN113968760A CN202111301643.6A CN202111301643A CN113968760A CN 113968760 A CN113968760 A CN 113968760A CN 202111301643 A CN202111301643 A CN 202111301643A CN 113968760 A CN113968760 A CN 113968760A
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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
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F11/00—Other organic fertilisers
- C05F11/02—Other organic fertilisers from peat, brown coal, and similar vegetable deposits
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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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Abstract
The invention provides a preparation process of a multi-element potassium fulvate sulfate fertilizer, and relates to the technical field of fertilizer production. The preparation process of the multi-element potassium fulvate sulfate fertilizer comprises the following raw materials in parts by weight: 700 to 800 parts of potassium sulfate, 50 to 100 parts of potassium hydroxide, 100 parts of weathered coal and 150 to 3 parts of potassium dihydrogen phosphate, 30 to 60 parts of magnesium oxide, 0.5 to 1.0 part of stabilizer, 1 to 5 parts of soil conditioner, 0 to 3 parts of plant growth regulator and 5 to 10 parts of additive. The invention provides a process for preparing multi-element potassium fulvate sulfate fertilizer, which is characterized in that the fertilizer has the characteristics of full nutrition, full water solubility and no pollution by adding a plurality of trace elements, contains a large amount of elements such as sulfur, calcium, magnesium, zinc, boron and the like required by plants, and also contains potassium fulvate with chelation and a plant production regulator, so that the fertilizer can be quickly absorbed by plants and has the remarkable characteristics of high efficiency, high quality, water saving, yield increase and the like.
Description
Technical Field
The invention relates to the technical field of fertilizer production, in particular to a preparation process of a multi-element potassium fulvate sulfate fertilizer.
Background
In response to the national fertilizer zero-growth policy, the humic acid fertilizer is popular in the market due to good fertilizer efficiency, ecological fertilizer characteristics and the like, and the Chinese farm-Han has the advantages of harvest and no harvest, and is in water; the water-soluble fertilizer is an integral trend of the current and future fertilizer development, and the humic acid is used as a good additive in the current fertilizer market and is combined to be made into a fertilizer form so as to achieve the maximum utilization of the fertilizer.
The existing water-soluble humic acid fertilizer comprises a humic acid-containing water-soluble fertilizer and a water-soluble humic acid compound fertilizer, more humic acid-containing water-soluble fertilizer products are produced, the process is simple, most of the products are blended, and the high tower is used as the existing advanced fertilizer production process, and the product particles are smooth and glossy in appearance, have the characteristics of high strength, good instant solubility, difficult pulverization and the like, and are accepted by the market, but the yellow humic acid compound fertilizer in the existing market is few, and the products are not only a gap in the fertilizer market, but also are a great trend of the future market of the humic acid fertilizer.
The fulvic acid has the functions of improving nutrient utilization rate and fertilizer efficiency, improving soil, improving stress resistance (including drought resistance, cold resistance, waterlogging resistance, disease and insect resistance, salt and alkali resistance, various pollution resistance and the like) of crops, improving crop quality, promoting crop growth, reducing and preventing environmental pollution and the like.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation process of a multi-element fulvic acid potassium sulfate fertilizer, which solves the problems that the existing fulvic acid fertilizers are simply and physically mixed, various nutrients cannot be organically and uniformly mixed, the structure is loose, water is added in some production processes, and the fertilizers are easy to form plates and lose efficacy during storage, are not beneficial to storage and the like.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the multi-element yellow humic acid potassium sulfate fertilizer comprises the following raw materials in parts by weight: 700 to 800 parts of potassium sulfate, 50 to 100 parts of potassium hydroxide, 100 parts of weathered coal and 150 to 3 parts of organic solvent, 30 to 60 parts of monopotassium phosphate, 10 to 20 parts of magnesium oxide, 0.5 to 1.0 part of stabilizer, 1 to 5 parts of soil conditioner, 0 to 3 parts of plant growth regulator and 5 to 10 parts of additive;
the additive comprises zinc element, boron element and manganese element inside.
Preferably, the feed comprises the following raw materials in parts by weight: 700 parts of potassium sulfate, 50 parts of potassium hydroxide, 100-3 parts of weathered coal, 30 parts of monopotassium phosphate, 100 parts of potassium sulfate, 10 parts of magnesium oxide, 0.5 part of stabilizer, 1 part of soil conditioner, 1 part of plant growth regulator and 5 parts of additive.
Preferably, the feed comprises the following raw materials in parts by weight: the composite material comprises the following raw materials in parts by weight: 750 parts of potassium sulfate, 75 parts of potassium hydroxide, 125-3 parts of weathered coal, 45 parts of monopotassium phosphate, 125 parts of potassium sulfate, 15 parts of magnesium oxide, 0.75 part of stabilizer, 3 parts of soil conditioner, 2 parts of plant growth regulator and 7.5 parts of additive.
Preferably, the feed comprises the following raw materials in parts by weight: the composite material comprises the following raw materials in parts by weight: 800 parts of potassium sulfate, 100 parts of potassium hydroxide, 150-3 parts of weathered coal, 60 parts of monopotassium phosphate, 150 parts of potassium sulfate, 20 parts of magnesium oxide, 1.0 part of stabilizer, 5 parts of soil conditioner, 3 parts of plant growth regulator and 10 parts of additive.
Preferably, the potassium hydroxide and the weathered coal are mixed with water to react to generate the fulvic acid.
Preferably, the zinc element raw material in the additive is one of zinc sulfate monohydrate, zinc sulfate heptahydrate and humic acid chelated zinc.
Preferably, the boron element raw material in the additive is one of borax or humic acid chelated boron.
Preferably, the manganese element raw material in the additive is EDTA chelated manganese.
A preparation method of a multi-element yellow humic acid potassium sulfate fertilizer is characterized by comprising the following steps: the method comprises the following steps:
s1, putting 50-100 parts of potassium hydroxide and 100-3 parts of weathered coal raw materials into a dissolving tank for dissolving and stirring, melting into primary mixed slurry at 120-125 ℃, and enabling the primary mixed slurry to enter the primary mixing tank in an overflow mode;
s2, adding 100-150 parts of potassium sulfate, 30-60 parts of monopotassium phosphate and 10-20 parts of magnesium oxide into the primary mixing tank, stirring and mixing the potassium sulfate, the monopotassium phosphate and the magnesium oxide with the primary mixed slurry, dissolving and stirring the materials for 5min at the temperature of 110-115 ℃, uniformly stirring the materials to prepare secondary mixed slurry, and naturally overflowing the secondary mixed slurry from the interior of the primary mixing tank into the interior of the secondary mixing tank;
s3, then adding 0.5-1.0 part of stabilizer, 1-5 parts of soil conditioner, 0-3 parts of plant growth regulator and 5-10 parts of additive into the secondary mixing tank, stirring and mixing the secondary mixing tank and the secondary mixing slurry, dissolving the materials and stirring for 2min at the temperature of 100-105 ℃, and uniformly stirring to prepare a finished product slurry;
s4, the manufactured finished product slurry enters a refiner for refining in an overflow mode, and the finished product slurry is mixed and refined under the high-speed stirring of the refiner to obtain mixed refined material;
and S5, feeding the obtained ground pulp into a granulator, performing spray granulation through a granulation nozzle in the granulator, then enabling the granulated slurry to fall freely, receiving materials, and packaging products to obtain the multi-element potassium fulvic acid sulfate fertilizer.
Preferably, the dissolving and stirring speed in the step S1 is 140 to 160r/min, and the dissolving and stirring speed in the steps S2 and S3 is 180 to 220 r/min.
(III) advantageous effects
The invention provides a preparation process of a multi-element potassium fulvate sulfate fertilizer. The method has the following beneficial effects:
1. the multi-element potassium fulvate sulfate fertilizer provided by the invention has the characteristics of full nutrition, full water solubility and no pollution by adding various trace elements, contains a large amount of elements such as sulfur, calcium, magnesium, zinc, boron and the like required by plants, and also contains potassium fulvate with a chelating effect and a plant production regulator, so that the fertilizer has the remarkable characteristics of quick absorption of plants, high efficiency, high quality, water saving, yield increase and the like, has the obvious characteristics of directional, quantitative and fixed crop nutrient element supplement, meets the special requirements of different crop growth periods on nutrition, and solves the problems of malnutrition and abnormal growth caused by late fertilizer removal and nutrient deficiency of crops.
2. The preparation process of the multi-element potassium fulvate sulfate fertilizer provided by the invention can meet the requirement of full water solubility of the fertilizer, provides macroelement nutrition for crops and promotes the growth of the crops on the premise of being suitable for drip irrigation equipment, promotes the requirements of the crops on nutrients in the fertilizer in a water and fertilizer integrated mode, can regulate the growth during the growth and development of the crops by adding various trace elements, and has the advantages of improving the yield of the crops, improving the quality of the crops, improving the soil and the like.
3. According to the preparation process of the multi-element potassium fulvate sulfate fertilizer, the raw materials with high standard and good stability are selected, the structures of the raw materials are reasonably matched, the time for the raw materials to enter the primary melting tank and the temperature control points are skillfully matched, and after the potassium fulvate and the trace elements are added, the fertilizer has the effects of regulating soil hardening, activating soil and regulating the pH value of the soil, can also play a role in promoting photosynthesis of crops, and achieves the purposes of promoting the growth of plant roots and strengthening stalks.
4. The multi-element yellow humic acid potassium sulfate fertilizer provided by the invention has the effects of cold resistance, drought resistance, dry hot wind resistance and continuous cropping resistance, enhances the photosynthesis of crops, promotes the growth and metabolism of plants, is beneficial to the growth and development of the crops, can reduce the incidence of diseases and insect pests and infection of the crops, has the excellent characteristics which are not possessed by the traditional fertilizer, can avoid soil fixation and leaching, and improves the fertilizer efficiency.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment of the invention provides a multi-element potassium fulvate sulfate fertilizer which comprises the following raw materials in parts by weight: 700 parts of potassium sulfate, 50 parts of potassium hydroxide, 100-3 parts of weathered coal, 30 parts of monopotassium phosphate, 100 parts of potassium sulfate, 10 parts of magnesium oxide, 0.5 part of stabilizer, 1 part of soil conditioner, 1 part of plant growth regulator and 5 parts of additive.
A preparation method of a multi-element potassium fulvate sulfate fertilizer comprises the following steps:
s1, 50 parts of potassium hydroxide and 100-3 parts of weathered coal raw materials are placed into a dissolving tank to be dissolved and stirred, the materials are melted into primary mixed slurry at 120 ℃, and the primary mixed slurry enters a primary mixing tank in an overflow mode;
s2, adding 100 parts of potassium sulfate, 30 parts of monopotassium phosphate and 10 parts of magnesium oxide into the primary mixing tank, stirring and mixing the potassium sulfate, the monopotassium phosphate and the magnesium oxide with the primary mixed slurry, dissolving and stirring the materials for 5min at the temperature of 110 ℃, uniformly stirring the materials to prepare secondary mixed slurry, and naturally overflowing the secondary mixed slurry from the interior of the primary mixing tank into the interior of the secondary mixing tank;
s3, then adding 0.5 part of stabilizer, 1 part of soil conditioner, 1 part of plant growth regulator and 5 parts of additive into the secondary mixing tank, stirring and mixing the mixture and the secondary mixed slurry, dissolving the materials and stirring for 2min at the temperature of 100 ℃, and preparing finished product slurry after uniformly stirring;
s4, the manufactured finished product slurry enters a refiner for refining in an overflow mode, and the finished product slurry is mixed and refined under the high-speed stirring of the refiner to obtain mixed refined material;
and S5, feeding the obtained ground pulp into a granulator, performing spray granulation through a granulation nozzle in the granulator, then enabling the granulated slurry to fall freely, receiving materials, and packaging products to obtain the multi-element potassium fulvic acid sulfate fertilizer.
The dissolving stirring speed in the step S1 is 140r/min, and the dissolving stirring speed in the steps S2 and S3 is 180 r/min.
Example 2:
the multi-element yellow humic acid potassium sulfate fertilizer comprises the following raw materials in parts by weight: 750 parts of potassium sulfate, 75 parts of potassium hydroxide, 125-3 parts of weathered coal, 45 parts of monopotassium phosphate, 125 parts of potassium sulfate, 15 parts of magnesium oxide, 0.75 part of stabilizer, 3 parts of soil conditioner, 2 parts of plant growth regulator and 7.5 parts of additive.
A preparation method of a multi-element potassium fulvate sulfate fertilizer comprises the following steps:
s1, putting 75 parts of potassium hydroxide and 125-3 parts of weathered coal raw materials into a dissolving tank for dissolving and stirring, melting into primary mixed slurry at 122 ℃, and enabling the primary mixed slurry to enter a primary mixing tank in an overflow mode;
s2, adding 125 parts of potassium sulfate, 45 parts of monopotassium phosphate and 15 parts of magnesium oxide into the primary mixing tank, stirring and mixing the potassium sulfate, the monopotassium phosphate and the magnesium oxide with the primary mixed slurry, dissolving the materials and stirring for 5min at 112 ℃, uniformly stirring to prepare secondary mixed slurry, and naturally overflowing from the interior of the primary mixing tank into the interior of the secondary mixing tank;
s3, then adding 0.75 part of stabilizer, 3 parts of soil conditioner, 2 parts of plant growth regulator and 7.5 parts of additive into the secondary mixing tank, stirring and mixing the secondary mixing tank and the secondary mixing slurry, dissolving the materials and stirring for 2min at the temperature of 102 ℃, and uniformly stirring to prepare finished product slurry;
s4, the manufactured finished product slurry enters a refiner for refining in an overflow mode, and the finished product slurry is mixed and refined under the high-speed stirring of the refiner to obtain mixed refined material;
and S5, feeding the obtained ground pulp into a granulator, performing spray granulation through a granulation nozzle in the granulator, then enabling the granulated slurry to fall freely, receiving materials, and packaging products to obtain the multi-element potassium fulvic acid sulfate fertilizer.
The dissolving stirring speed in the step S1 is 150r/min, and the dissolving stirring speed in the steps S2 and S3 is 200 r/min.
Example 3:
the multi-element yellow humic acid potassium sulfate fertilizer comprises the following raw materials in parts by weight: the composite material comprises the following raw materials in parts by weight: 800 parts of potassium sulfate, 100 parts of potassium hydroxide, 150-3 parts of weathered coal, 60 parts of monopotassium phosphate, 150 parts of potassium sulfate, 20 parts of magnesium oxide, 1.0 part of stabilizer, 5 parts of soil conditioner, 3 parts of plant growth regulator and 10 parts of additive.
A preparation method of a multi-element potassium fulvate sulfate fertilizer comprises the following steps:
s1, putting 100 parts of potassium hydroxide and 150-3 parts of weathered coal raw materials into a dissolving tank for dissolving and stirring, melting the materials into primary mixed slurry at 125 ℃, and enabling the primary mixed slurry to enter a primary mixing tank in an overflow mode;
s2, adding 150 parts of potassium sulfate, 60 parts of monopotassium phosphate and 20 parts of magnesium oxide into the primary mixing tank, stirring and mixing the potassium sulfate, the monopotassium phosphate and the magnesium oxide with the primary mixed slurry, dissolving the materials and stirring for 5min at the temperature of 115 ℃, uniformly stirring to prepare secondary mixed slurry, and naturally overflowing from the interior of the primary mixing tank into the interior of the secondary mixing tank;
s3, adding 1.0 part of stabilizer, 5 parts of soil conditioner, 3 parts of plant growth regulator and 10 parts of additive into the secondary mixing tank, stirring and mixing the secondary mixing tank and the secondary mixing slurry, dissolving the materials and stirring for 2min at 105 ℃, and uniformly stirring to obtain finished product slurry;
s4, the manufactured finished product slurry enters a refiner for refining in an overflow mode, and the finished product slurry is mixed and refined under the high-speed stirring of the refiner to obtain mixed refined material;
and S5, feeding the obtained ground pulp into a granulator, performing spray granulation through a granulation nozzle in the granulator, then enabling the granulated slurry to fall freely, receiving materials, and packaging products to obtain the multi-element potassium fulvic acid sulfate fertilizer.
The dissolving and stirring speed in the step S1 is 160r/min, and the dissolving and stirring speed in the steps S2 and S3 is 220 r/min.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A multi-element yellow humic acid potassium sulfate fertilizer is characterized in that: the composite material comprises the following raw materials in parts by weight: 700 to 800 parts of potassium sulfate, 50 to 100 parts of potassium hydroxide, 100 parts of weathered coal and 150 to 3 parts of organic solvent, 30 to 60 parts of monopotassium phosphate, 10 to 20 parts of magnesium oxide, 0.5 to 1.0 part of stabilizer, 1 to 5 parts of soil conditioner, 0 to 3 parts of plant growth regulator and 5 to 10 parts of additive;
the additive comprises zinc element, boron element and manganese element inside.
2. The multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein: the composite material comprises the following raw materials in parts by weight: 700 parts of potassium sulfate, 50 parts of potassium hydroxide, 100-3 parts of weathered coal, 30 parts of monopotassium phosphate, 100 parts of potassium sulfate, 10 parts of magnesium oxide, 0.5 part of stabilizer, 1 part of soil conditioner, 1 part of plant growth regulator and 5 parts of additive.
3. The multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein: the composite material comprises the following raw materials in parts by weight: 750 parts of potassium sulfate, 75 parts of potassium hydroxide, 125-3 parts of weathered coal, 45 parts of monopotassium phosphate, 125 parts of potassium sulfate, 15 parts of magnesium oxide, 0.75 part of stabilizer, 3 parts of soil conditioner, 2 parts of plant growth regulator and 7.5 parts of additive.
4. The multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein: the composite material comprises the following raw materials in parts by weight: 800 parts of potassium sulfate, 100 parts of potassium hydroxide, 150-3 parts of weathered coal, 60 parts of monopotassium phosphate, 150 parts of potassium sulfate, 20 parts of magnesium oxide, 1.0 part of stabilizer, 5 parts of soil conditioner, 3 parts of plant growth regulator and 10 parts of additive.
5. The multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein: and the potassium hydroxide, the weathered coal and the water are mixed and reacted to generate the fulvic acid.
6. The multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein: the zinc element raw material in the additive is one of zinc sulfate monohydrate, zinc sulfate heptahydrate and humic acid chelated zinc.
7. The multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein: the boron element raw material in the additive is one of borax or humic acid chelated boron.
8. The multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein: the manganese element raw material in the additive is EDTA chelated manganese.
9. A preparation method of a multi-element yellow humic acid potassium sulfate fertilizer is characterized by comprising the following steps: the method comprises the following steps:
s1, putting 50-100 parts of potassium hydroxide and 100-3 parts of weathered coal raw materials into a dissolving tank for dissolving and stirring, melting into primary mixed slurry at 120-125 ℃, and enabling the primary mixed slurry to enter the primary mixing tank in an overflow mode;
s2, adding 100-150 parts of potassium sulfate, 30-60 parts of monopotassium phosphate and 10-20 parts of magnesium oxide into the primary mixing tank, stirring and mixing the potassium sulfate, the monopotassium phosphate and the magnesium oxide with the primary mixed slurry, dissolving and stirring the materials for 5min at the temperature of 110-115 ℃, uniformly stirring the materials to prepare secondary mixed slurry, and naturally overflowing the secondary mixed slurry from the interior of the primary mixing tank into the interior of the secondary mixing tank;
s3, then adding 0.5-1.0 part of stabilizer, 1-5 parts of soil conditioner, 0-3 parts of plant growth regulator and 5-10 parts of additive into the secondary mixing tank, stirring and mixing the secondary mixing tank and the secondary mixing slurry, dissolving the materials and stirring for 2min at the temperature of 100-105 ℃, and uniformly stirring to prepare a finished product slurry;
s4, the manufactured finished product slurry enters a refiner for refining in an overflow mode, and the finished product slurry is mixed and refined under the high-speed stirring of the refiner to obtain mixed refined material;
and S5, feeding the obtained ground pulp into a granulator, performing spray granulation through a granulation nozzle in the granulator, then enabling the granulated slurry to fall freely, receiving materials, and packaging products to obtain the multi-element potassium fulvic acid sulfate fertilizer.
10. The method for preparing the multi-element potassium fulvate sulfate fertilizer according to claim 1, wherein the method comprises the following steps: the dissolving and stirring speed in the step S1 is 140-160 r/min, and the dissolving and stirring speed in the steps S2 and S3 is 180-220 r/min.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103508790A (en) * | 2013-09-10 | 2014-01-15 | 砀山县沃福农业发展有限公司 | Fulvic acid macro-element water-soluble fertilizer and preparation method thereof |
| CN110698305A (en) * | 2019-11-20 | 2020-01-17 | 河南心连心化学工业集团股份有限公司 | Fulvic acid compound fertilizer suitable for corn planting in northeast region and preparation method thereof |
| CN110698301A (en) * | 2019-11-20 | 2020-01-17 | 河南心连心化学工业集团股份有限公司 | Full-water-soluble drip irrigation type fulvic acid compound fertilizer and preparation method thereof |
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- 2021-11-04 CN CN202111301643.6A patent/CN113968760A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103508790A (en) * | 2013-09-10 | 2014-01-15 | 砀山县沃福农业发展有限公司 | Fulvic acid macro-element water-soluble fertilizer and preparation method thereof |
| CN110698305A (en) * | 2019-11-20 | 2020-01-17 | 河南心连心化学工业集团股份有限公司 | Fulvic acid compound fertilizer suitable for corn planting in northeast region and preparation method thereof |
| CN110698301A (en) * | 2019-11-20 | 2020-01-17 | 河南心连心化学工业集团股份有限公司 | Full-water-soluble drip irrigation type fulvic acid compound fertilizer and preparation method thereof |
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Application publication date: 20220125 |