CN109206252A - A kind of nitro humus acid urea fertilizer and preparation method thereof - Google Patents
A kind of nitro humus acid urea fertilizer and preparation method thereof Download PDFInfo
- Publication number
- CN109206252A CN109206252A CN201811387372.9A CN201811387372A CN109206252A CN 109206252 A CN109206252 A CN 109206252A CN 201811387372 A CN201811387372 A CN 201811387372A CN 109206252 A CN109206252 A CN 109206252A
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- urea
- nitro humus
- humus acid
- fertilizer
- liquid
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C1/00—Ammonium nitrate fertilisers
-
- 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
-
- 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
-
- 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
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Fertilizers (AREA)
Abstract
A kind of nitro humus acid urea fertilizer, it is related to technical field of fertilizers, humate is used in mixed way by it according to a certain percentage with fusing urea, since humate contains a large amount of active function groups, in addition to itself has excellent activity, chelate and complex compound can also be formed with nitrogen, or carry out ion exchange, physical absorption etc..So as to effectively reduce the decomposition of urea, be lost, increase the utilization rate of urea, and reduce the pollution to soil.A kind of preparation method of above-mentioned nitro humus acid urea fertilizer, it is easy to operate, it is not high to equipment requirement, the large-scale industrial production of above-mentioned nitro humus acid urea fertilizer may be implemented.
Description
Technical field
The present invention relates to technical field of fertilizers, in particular to a kind of nitro humus acid urea fertilizer and preparation method thereof.
Background technique
Urea, also known as carbamide (carbamide) are a kind of white by the organic compound that carbon, nitrogen, oxygen, hydrogen form
Crystal.One of simplest organic compound is the main nitrogenous of mammal and certain fish vivo protein metabolic breakdowns
Final product.
Urea nitrogen content is up to 46%, is the highest chemical nitrogen fertilizer of nitrogen content.Meanwhile as a kind of neutral fertilizer, urea
Suitable for various soil and plant, agricultural needs amount is maximum, use scope is extensive.But urea, after being manured into soil, meeting exists
It decomposes, be lost quickly under the action of soil urease and nitrifier, utilization rate only has 35% or so, economic loss is not only caused,
And nitrate, nitrite, the nitrogen oxides that urea decomposition and inversion is formed also would seriously pollute the environment.
Summary of the invention
The purpose of the present invention is to provide a kind of nitro humus acid urea fertilizers, can effectively reduce decomposition, the stream of urea
It loses, increases the utilization rate of urea, and reduce the pollution to soil.
It is easy to operate another object of the present invention is to provide a kind of preparation method of nitro humus acid urea fertilizer, it is right
Equipment requirement is not high, and the large-scale industrial production of above-mentioned nitro humus acid urea fertilizer may be implemented.
The embodiment of the present invention is achieved in that
A kind of nitro humus acid urea fertilizer, by weight percentage comprising:
1%~1.5% nitro humus acid salting liquid and 98.5%~99% fusing urea；
Wherein, in parts by weight, nitro humus acid salting liquid includes: 25~40 parts of humate, urea 21~27
Part, 27~35 parts of ammonium nitrate, 11~15 parts of water and 0.001~0.02 part of auxiliary agent.
A kind of preparation method of above-mentioned nitro humus acid urea fertilizer comprising:
Nitro humus acid salting liquid and fusing urea are mixed, are granulated.
The beneficial effect of the embodiment of the present invention is:
The embodiment of the invention provides a kind of nitro humus acid urea fertilizers, by humate and fusing urea according to certain
Ratio be used in mixed way, since humate contains a large amount of active function groups, except itself have excellent activity in addition to, moreover it is possible to nitrogen
Chelate and complex compound are formed, or carries out ion exchange, physical absorption etc..So as to effectively reduce decomposition, the stream of urea
It loses, increases the utilization rate of urea, and reduce the pollution to soil.
It is easy to operate the embodiment of the invention also provides a kind of preparation method of above-mentioned nitro humus acid urea fertilizer, it is right
Equipment requirement is not high, and the large-scale industrial production of above-mentioned nitro humus acid urea fertilizer may be implemented.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of preparation technology flow chart of nitro humus acid urea fertilizer provided by the embodiment of the present invention 1.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
A kind of nitro humus acid urea fertilizer of the embodiment of the present invention and preparation method thereof is specifically described below.
The embodiment of the invention provides a kind of nitro humus acid urea fertilizers, by weight percentage comprising:
1%~1.5% nitro humus acid salting liquid and 98.5%~99% fusing urea；
Wherein, in parts by weight, nitro humus acid salting liquid includes: 25~40 parts of humate, liquid nitrogen fertilizer 60
~75 parts and 0.001~0.02 part of auxiliary agent.
Preferably, the nitro humus acid salting liquid include: 30~35 parts of humate, 65~70 parts of liquid nitrogen fertilizer, with
And 0.01~0.02 part of auxiliary agent.
Urea nitrogen content is up to 46%, is the highest chemical nitrogen fertilizer of nitrogen content.Meanwhile as a kind of neutral fertilizer, urea
Suitable for various soil and plant, agricultural needs amount is maximum, use scope is extensive.But urea, after being manured into soil, meeting exists
It decomposes, be lost quickly under the action of soil urease and nitrifier, utilization rate only has 35% or so, economic loss is not only caused,
And nitrate, nitrite, the nitrogen oxides that urea decomposition and inversion is formed also would seriously pollute the environment.
Humic acid is plant and animal residues by complicated biology, chemical action formation, accounts for soil and hydrosphere ecosystem
The 50%~80% of middle total organic matter, it is rich in various active group, can interact with many organic and inorganic objects,
While providing nutrient to plant, behavior of the pesticide in soil environment can control.
In embodiments of the present invention, inventor is by humate and urea reaction, the HA- urea complex compound (UHA) of formation.By
Contain a large amount of active function groups in humate, in addition to itself has excellent activity, moreover it is possible to (especially with various chemical fertilizer
Nitrogen) chelate and complex compound can be formed, or carry out ion exchange, physical absorption etc..Therefore, UHA is as a kind of slow-release fertilizer
Material, more has remarkable result than other methods.
Further, in the present invention is implemented, to the purity of the urea mixed with the nitro humus acid salting liquid >=
99%.Preferably, moisture content≤0.8%, Biuret Content≤0.5%.
Further, humate includes in biochemical fulvic acid potassium, mineral sources potassium fulvate and mineral sources fulvic acid zinc
It is at least one.Fulvic acid is a kind of organic high molecular compound, is the highest component of activity in humic acid.Contain carboxylic in its molecule
Thus the various actives function such as base, phenolic hydroxyl group, ketone group and amido determines that fulvic acid has acid, hydrophily and good
Chelate adsorptivity.Fulvic acid can timely supplement the nutrient being lost in soil, make soil activating, have vitality, reduce soil
Nutrient continuous cropping disease caused by taken in excess in earth.Preferably, humate is that mineral sources potassium fulvate or mineral sources are yellow rotten
Sour zinc.Mineral sources fulvic acid is a kind of pure natural mineral active element fertilizer, includes microelement, rare earth element, plant growth tune
Agent, the multiple nutritional components such as viral inhibitors are saved, makes that nutrient is more sufficient, supply is more reasonable, so as to avoid crop because lacking member
Element and caused by various physiological disturbances generation, keep the more vigorous leaf color of crop plant type more dark green, lodging tolerance is stronger.
Optionally, liquid nitrogen fertilizer includes at least one of urea liquid, ammonium nitrate solution.It is molten to can be single urea
Liquid or ammonium nitrate solution are also possible to the mixed solution of urea liquid and ammonium nitrate solution.Wherein, the concentration of urea liquid is
80wt%~85wt%, the concentration of ammonium nitrate solution are 90wt%~95wt%.
Preferably, liquid nitrogen fertilizer used in the embodiment of the present invention is the mixed solution of urea liquid and ammonium nitrate solution, is pressed
According to parts by weight meter, which includes: 21~27 parts by weight of urea, 27~35 parts by weight of ammonium nitrate, 11~15 weight of water
Part.
Wherein, auxiliary agent includes at least one of dispersing agent, filler, defoaming agent and antifreezing agent.Preferably, auxiliary agent includes disappearing
At least one of infusion and dispersing agent.Defoaming agent is selected from one of tbp, octanol and organic silicon defoamer or more
Kind, preferably tbp.
The embodiment of the invention also provides a kind of preparation methods of above-mentioned nitro humus acid urea fertilizer comprising:
Nitro humus acid salting liquid and the urea of melting are mixed, are granulated.
The urea temperature of melting is 120~130 DEG C.In actual production, nitro humus acid salting liquid can be passed through to meter
Amount pump is in the exit of molten urea pump, and by metered, nitro humus acid salting liquid and fusing urea are in pipeline input process
In be sufficiently mixed uniformly, then through granulation, cooling, be packaged to be nitro humus acid urea fertilizer.
Further, preparation method further include: be mixed with humate, liquid nitrogen fertilizer and auxiliary agent to obtain nitre
Base humate solution.In actual production, when mixed solution of the liquid nitrogen fertilizer using urea and ammonium nitrate, can first by
100~120 DEG C of urea liquid and the mixing of 110~130 DEG C of acid ammonium solution, to prepare mixed solution.It then again will be above-mentioned mixed
It closes solution to mix with humate and auxiliary agent, obtains nitro humus acid salting liquid.Preferably, humate, liquid nitrogen fertilizer and
The mixing of auxiliary agent is 10~30min of stirring under the speed of agitator of 1000~2000rpm.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
A kind of nitro humus acid urea fertilizer is present embodiments provided, according to mass percent meter comprising:
1% nitro humus acid salting liquid and 99% urea.
Wherein, in parts by weight, nitro humus acid salting liquid includes: 25 parts of potassium fulvate, urea ammonium nitrate solution
75 parts and 0.002 part of defoaming agent of (urea: ammonium nitrate: water=36:45:19).
Its preparation flow figure referring to Fig.1 shown in, specifically the preparation method is as follows:
S1. by the mass fraction from urea system be 80% urea liquid and mass fraction from ammonium nitrate system
It is clear and transparent to solution according to stirring in metered mixing tank for coating colors A for 90% ammonium nitrate solution, it is molten to obtain urea-ammonium nitrate
Liquid.
S2. urea-ammonium nitrate solutions are added in mixing tank for coating colors B, quantitative potassium fulvate are then added, 2000rpm's
Under speed of agitator, 15min is stirred, nitro humus acid potassium solution is obtained.
S3. nitro humus acid potassium solution prepared in mixing tank for coating colors B is transported to nitro humus acid potassium solution storage tank through pump,
Then through in the metered molten urea pump outlet line of metering pump.
S4. nitro humus acid potassium solution is mixed with fusing urea through pipeline conveying, is granulated, is then fed into prilling section
Packing department is packed.
The nitro humus acid urea fertilizer of the present embodiment production, fulvic acid content is uniform, includes microelement, rare earth member
The multiple nutritional components such as element, plant growth regulator, viral inhibitors, make nutrient it is more sufficient, supply it is more reasonable, so as to avoid
Crop due to lacking element caused by various physiological disturbances generation, keep the more vigorous leaf color of crop plant type more dark green, it is resistant to lodging
Ability is stronger.
Embodiment 2
A kind of nitro humus acid urea fertilizer is present embodiments provided, according to mass percent meter comprising:
1% nitro humus acid salting liquid and 99% urea.
Wherein, in parts by weight, nitro humus acid salting liquid includes: 30 parts of potassium fulvate, urea ammonium nitrate solution
70 parts and 0.002 part of defoaming agent of (urea: ammonium nitrate: water=36:45:19).
Preparation method is as follows:
S1. by the mass fraction from urea system be 85% urea liquid and mass fraction from ammonium nitrate system
It is clear and transparent to solution according to stirring in metered mixing tank for coating colors A for 90% ammonium nitrate solution, it is molten to obtain urea-ammonium nitrate
Liquid.
S2. urea-ammonium nitrate solutions are added in mixing tank for coating colors B, quantitative potassium fulvate are then added, 2000rpm's
Under speed of agitator, 10min is stirred, nitro humus acid potassium solution is obtained.
S3. nitro humus acid potassium solution prepared in mixing tank for coating colors B is transported to nitro humus acid potassium solution storage tank through pump,
Then through in the metered molten urea pump outlet line of metering pump.
S4. nitro humus acid potassium solution is mixed with fusing urea through pipeline conveying, is granulated, is then fed into prilling section
Packing department is packed.
The nitro humus acid urea fertilizer of the present embodiment production, fulvic acid content is uniform, can help improve soil texture, have
Conducive to the growth of beneficial bacterium in soil, the permeability, water-retaining property and nutrient preserving capability of soil are improved.
Embodiment 3
A kind of nitro humus acid urea fertilizer is present embodiments provided, according to mass percent meter comprising:
1% nitro humus acid salting liquid and 99% urea.
Wherein, in parts by weight, nitro humus acid salting liquid includes: 25 parts of fulvic acid zinc, urea ammonium nitrate solution
75 parts and 0.003 part of defoaming agent of (urea: ammonium nitrate: water=36:45:19).
Preparation method is as follows:
S1. by the mass fraction from urea system be 80% urea liquid and mass fraction from ammonium nitrate system
It is clear and transparent to solution according to stirring in metered mixing tank for coating colors A for 95% ammonium nitrate solution, it is molten to obtain urea-ammonium nitrate
Liquid.
S2. urea-ammonium nitrate solutions are added in mixing tank for coating colors B, quantitative fulvic acid zinc are then added, 1000rpm's
Under speed of agitator, 30min is stirred, nitro humus acid zinc solution is obtained.
S3. nitro humus acid zinc solution prepared in mixing tank for coating colors B is transported to nitro humus acid zinc solution storage tank through pump,
Then through in the metered molten urea pump outlet line of metering pump.
S4. nitro humus acid zinc solution is mixed with fusing urea through pipeline conveying, is granulated, is then fed into prilling section
Packing department is packed.
The present embodiment production nitro humus acid urea fertilizer, fulvic acid content is uniform, can effectively supplement in microelement,
Prevent nutritional deficiency disease, promote well developed root system, strongly take root, improve crop photosynthesis, improves crop quality.
Embodiment 4
A kind of nitro humus acid urea fertilizer is present embodiments provided, according to mass percent meter comprising:
1.5% nitro humus acid salting liquid and 98.5% urea.
Wherein, in parts by weight, nitro humus acid salting liquid includes: 40 parts of fulvic acid zinc, urea liquid 60 part, point
0.001 part of powder and 0.005 part of defoaming agent.
Preparation method is as follows:
S1. the urea liquid that the mass fraction from urea system is 85% is added in mixing tank for coating colors A, is then added quantitative
Fulvic acid zinc, under the speed of agitator of 1500rpm, stir 20min, obtain nitro humus acid zinc solution.
S2. nitro humus acid zinc solution prepared in mixing tank for coating colors A is transported to nitro humus acid zinc solution storage tank through pump,
Then through in the metered molten urea pump outlet line of metering pump.
S3. nitro humus acid zinc solution is mixed with fusing urea through pipeline conveying, is granulated, is then fed into prilling section
Packing department is packed.
Embodiment 5
A kind of nitro humus acid urea fertilizer is present embodiments provided, according to mass percent meter comprising:
1.2% nitro humus acid salting liquid and 98.8% urea.
Wherein, in parts by weight, nitro humus acid salting liquid include: 35 parts of potassium fulvate, 65 parts of ammonium nitrate solution,
0.002 part of antifreezing agent and 0.002 part of defoaming agent.
Preparation method is as follows:
It S1. will be that 95% ammonium nitrate solution is added in mixing tank for coating colors A from the mass fraction of ammonium nitrate system, it is fixed to be then added
The potassium fulvate of amount stirs 20min, obtains nitro humus acid potassium solution under the speed of agitator of 1800rpm.
S2. nitro humus acid potassium solution prepared in mixing tank for coating colors A is transported to nitro humus acid potassium solution storage tank through pump,
Then through in the metered molten urea pump outlet line of metering pump.
S3. nitro humus acid potassium solution is mixed with fusing urea through pipeline conveying, is granulated, is then fed into prilling section
Packing department is packed.
In conclusion humate and melting are urinated the embodiment of the invention provides a kind of nitro humus acid urea fertilizer
Element is used in mixed way according to a certain percentage, since humate contains a large amount of active function groups, except itself has excellent activity
Outside, moreover it is possible to form chelate and complex compound with nitrogen, or carry out ion exchange, physical absorption etc..So as to effectively reduce urine
The decomposition of element is lost, and increases the utilization rate of urea, and reduce the pollution to soil.
It is easy to operate the embodiment of the invention also provides a kind of preparation method of above-mentioned nitro humus acid urea fertilizer, it is right
Equipment requirement is not high, and the large-scale industrial production of above-mentioned nitro humus acid urea fertilizer may be implemented.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of nitro humus acid urea fertilizer, which is characterized in that by weight percentage, comprising:
1%~1.5% nitro humus acid salting liquid and 98.5%~99% urea；
Wherein, in parts by weight, the nitro humus acid salting liquid includes: 25~40 parts of humate, liquid nitrogen fertilizer 60
~75 parts and 0.001~0.02 part of auxiliary agent.
2. nitro humus acid urea fertilizer according to claim 1, which is characterized in that molten with the nitro humus acid salt
Purity >=99% of the urea of liquid mixing.
3. nitro humus acid urea fertilizer according to claim 1, which is characterized in that the humate includes biochemical yellow rotten
At least one of sour potassium, mineral sources potassium fulvate and mineral sources fulvic acid zinc；Preferably, the humate is that mineral sources are yellow
Rotten acid potassium or mineral sources fulvic acid zinc.
4. nitro humus acid urea fertilizer according to claim 1, which is characterized in that the liquid nitrogen fertilizer includes that urea is molten
At least one of liquid, ammonium nitrate solution；Preferably, the concentration of the urea liquid is 80wt%~85wt%；Preferably, institute
The concentration for stating ammonium nitrate solution is 90wt%~95wt%.
5. nitro humus acid urea fertilizer according to claim 4, which is characterized in that the liquid nitrogen fertilizer be urea liquid and
The mixed solution of ammonium nitrate solution, in parts by weight, the mixed solution include: 21~27 parts by weight of urea, ammonium nitrate
27~35 parts by weight, 11~15 parts by weight of water.
6. nitro humus acid urea fertilizer according to claim 1, which is characterized in that the auxiliary agent include dispersing agent, filler,
At least one of defoaming agent and antifreezing agent；Preferably, the auxiliary agent includes at least one of defoaming agent and dispersing agent.
7. a kind of preparation method of nitro humus acid urea fertilizer as described in any one of claims 1 to 6, which is characterized in that packet
It includes:
The nitro humus acid salting liquid and the urea of melting are mixed, are granulated.
8. preparation method according to claim 7, which is characterized in that the urea temperature of melting is 120~130 DEG C.
9. preparation method according to claim 7 or 8, which is characterized in that by the humate, the liquid nitrogen fertilizer,
And the auxiliary agent is mixed with to obtain the nitro humus acid salting liquid.
10. preparation method according to claim 9, which is characterized in that the humate, the liquid nitrogen fertilizer and
The mixing of the auxiliary agent is 10~30min of stirring under the speed of agitator of 1000~2000rpm.
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| CN201811387372.9A CN109206252A (en) | 2018-11-20 | 2018-11-20 | A kind of nitro humus acid urea fertilizer and preparation method thereof |
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| CN201811387372.9A CN109206252A (en) | 2018-11-20 | 2018-11-20 | A kind of nitro humus acid urea fertilizer and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110483217A (en) * | 2019-09-29 | 2019-11-22 | 江苏国睿黄腐酸技术有限公司 | Liquid slow-release nitrogenous fertilizer and its preparation process |
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|---|---|---|---|---|
| CN101781134A (en) * | 2009-01-15 | 2010-07-21 | 张博哲 | Tower-smelt organic-inorganic compound fertilizer and preparation method thereof |
| CN103058735A (en) * | 2012-12-24 | 2013-04-24 | 德邦华源（北京）有机农业荒漠化治理技术发展有限公司 | Humus acid urea fertilizer and anhydrous preparation method thereof |
| CN104211491A (en) * | 2014-06-27 | 2014-12-17 | 胡红辉 | Compound fertilizer preparation method for improving utilization rate of phosphorus element |
-
2018
- 2018-11-20 CN CN201811387372.9A patent/CN109206252A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101781134A (en) * | 2009-01-15 | 2010-07-21 | 张博哲 | Tower-smelt organic-inorganic compound fertilizer and preparation method thereof |
| CN103058735A (en) * | 2012-12-24 | 2013-04-24 | 德邦华源（北京）有机农业荒漠化治理技术发展有限公司 | Humus acid urea fertilizer and anhydrous preparation method thereof |
| CN104211491A (en) * | 2014-06-27 | 2014-12-17 | 胡红辉 | Compound fertilizer preparation method for improving utilization rate of phosphorus element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110483217A (en) * | 2019-09-29 | 2019-11-22 | 江苏国睿黄腐酸技术有限公司 | Liquid slow-release nitrogenous fertilizer and its preparation process |
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Application publication date: 20190115 |