CN107266195A - It is a kind of that there is fertilizer of sustained release water retaining function and preparation method thereof - Google Patents
It is a kind of that there is fertilizer of sustained release water retaining function and preparation method thereof Download PDFInfo
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- CN107266195A CN107266195A CN201710581335.0A CN201710581335A CN107266195A CN 107266195 A CN107266195 A CN 107266195A CN 201710581335 A CN201710581335 A CN 201710581335A CN 107266195 A CN107266195 A CN 107266195A
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- Prior art keywords
- fertilizer
- preparation
- retaining function
- water retaining
- added
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- 239000003337 fertilizer Substances 0.000 title claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 238000013268 sustained release Methods 0.000 title claims abstract description 22
- 239000012730 sustained-release form Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229920002101 Chitin Polymers 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 229920000137 polyphosphoric acid Polymers 0.000 claims abstract description 20
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 18
- 239000000725 suspension Substances 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004202 carbamide Substances 0.000 claims abstract description 17
- 235000011837 pasties Nutrition 0.000 claims abstract description 16
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000005469 granulation Methods 0.000 claims abstract description 12
- 230000003179 granulation Effects 0.000 claims abstract description 12
- 239000008187 granular material Substances 0.000 claims description 10
- 238000006116 polymerization reaction Methods 0.000 claims description 6
- 150000001412 amines Chemical class 0.000 claims 1
- 230000002459 sustained effect Effects 0.000 abstract description 4
- 239000002689 soil Substances 0.000 description 15
- 239000002131 composite material Substances 0.000 description 13
- 235000015097 nutrients Nutrition 0.000 description 11
- 229920001807 Urea-formaldehyde Polymers 0.000 description 10
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- -1 Aldehyde compound Chemical class 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 206010016807 Fluid retention Diseases 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 235000010799 Cucumis sativus var sativus Nutrition 0.000 description 1
- 244000299906 Cucumis sativus var. sativus Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Classifications
-
- 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
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a kind of fertilizer for having and being sustained water retaining function and preparation method thereof.Its preparation method is to be added to the water carboxymethyl chitin and polyacrylamide to be thermally formed suspension; formalin is added into suspension; it is tuned into pasty state and obtains pasty liquid; the homogeneous liquid that homogeneous state is formed after urea reaction is added into pasty liquid, granulation after polyphosphoric acid is added into homogeneous liquid and obtains the fertilizer with sustained release water retaining function.Fertilizer prepared by the present invention can not only greatly improve the hardness of fertilizer, and can be that fertilizer has water retaining function.
Description
Technical field
The present invention relates to sustained-controll-release fertiliser technical field, and in particular to it is a kind of main by crosslinking chitin polyvinyl lactam and
Polyphosphoric acid ureaformaldehyde provides the fertilizer of nutrient slowly-released function.
Background technology
Current chemical fertilizer is in the application in agricultural, and generally existing consumption is big, and utilization rate is not enough, and field fertilizer can not be effectively sharp
With the problems such as, it is generally the case that slow release fertilizer is a kind of good solution.How to accomplish in the appropriate situation of nutrient formula
Under accomplish slow-release or control-release fertilizer, be one of the direction of current Fertilizer development.
Slow release fertilizer, i.e. release and release control fertilizer, sustained-controll-release fertiliser, wherein playing the nutrient composition of plant nutrient effect in soil
The speed of release is slow, or speed is controllable to a certain extent, so as to be made for thing constant absorption., can using slow release fertilizer
To reduce loss of the fertilizer nutrient in soil, fertilizer utilization efficiency is improved.
Slow-release fertilizer point three major types：(1) compound of water, such as ammonium magnesium phosphate are insoluble in；(2) coating or coated fertilizer,
Such as sulphur coated urea；(3) carrier slow release fertilizer, i.e. fertilizer nutrient are with natural or synthetic material in the fertilizer being physically or chemically bonded.
The content of the invention
Chinese patent (application number 201210593644.7) discloses a kind of ureaformaldehyde slow-release compound fertilizer, it is possible to increase total to support
Divide content, but intensity is only capable of being promoted to 18~25N, if destruction fertilizer structure, can cause the load fertilizer amount of carrier reduces.
In order to solve the deficiencies in the prior art, an object of the present invention is to provide a kind of fertilizer for having and being sustained water retaining function
The preparation method of material, its fertilizer prepared can not only greatly improve the hardness of fertilizer, and can be that fertilizer has water conservation
Function.
To achieve these goals, the technical scheme is that：
A kind of preparation method of the fertilizer with sustained release water retaining function, water is added by carboxymethyl chitin and polyacrylamide
In be thermally formed suspension, formalin is added into suspension, be tuned into pasty state obtain pasty liquid, urea is added into pasty liquid
The homogeneous liquid of homogeneous state is formed after reaction, granulation after polyphosphoric acid is added into homogeneous liquid and is obtained has sustained release water retaining function
Fertilizer.
The present invention is heated carboxymethyl chitin with polyacrylamide, part carboxyl and polyacrylamide in chitin
Part amino reacted, be crosslinked chitin and polyacrylamide, then add formaldehyde and carry out reaction with urea and form urea
Formaldehyde fertilisers, add polyphosphoric acid and are granulated, and can form sponge structure in its fertiliser granulates prepared, enable to nutrient
Slow release, while having water storage function.And the sponge structure formed adds the intensity of fertiliser granulates, enables its intensity
Reach 32.4N.
The second object of the present invention is to provide the fertilizer with sustained release water retaining function prepared by a kind of above-mentioned preparation method.Should
After fertilizer application is into soil, there can be longer fertilizer efficiency time.
Beneficial effects of the present invention are：
Fertilizer roundness prepared by the present invention is good, hardness is high, and granule strength is high.The present invention prepares the slow-release function of fertilizer,
The sponge network structure formed in the fertilizer that with the addition of crosslinking chitin polyvinyl lactam is essentially consisted in, physical absorption work is played
With resting fractionated molecule and be fixed in network, reach what nutriment discharged over time and slowly in soil
Effect, improves utilization rate of fertilizer, reduces fertilizer amount, adds soil granular, lifts water retention.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
Fig. 1 is the Nutrient change curve of fertilizer, wherein, abscissa is the time, and unit is day, and ordinate is that soil is always supported
Point, unit g/kg.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Formalin of the present invention is different from formaldehyde, wherein, formalin refers to the solution containing formaldehyde, formaldehyde nail
Aldehyde compound.
As background technology is introduced, there is the relatively low deficiency of fertilizer intensity in the prior art, in order to solve as above
Technical problem, present applicant proposes a kind of fertilizer for having and being sustained water retaining function and preparation method thereof.
A kind of exemplary embodiment of the application there is provided it is a kind of have sustained release water retaining function fertilizer preparation method,
Carboxymethyl chitin and polyacrylamide are added to the water and are thermally formed suspension, formalin is added into suspension, is tuned into
Pasty state obtains pasty liquid, is added into pasty liquid after urea reaction and forms the homogeneous liquid of homogeneous state, added into homogeneous liquid
Enter granulation after polyphosphoric acid and obtain the fertilizer with sustained release water retaining function.
The present invention is heated carboxymethyl chitin with polyacrylamide, part carboxyl and polyacrylamide in chitin
Part amino reacted, be crosslinked chitin and polyacrylamide, then add formaldehyde and carry out reaction with urea and form urea
Formaldehyde fertilisers, add polyphosphoric acid and are granulated, and can form sponge structure in its fertiliser granulates prepared, enable to nutrient
Slow release, while having water storage function.And the sponge structure formed adds the intensity of fertiliser granulates, enables its intensity
Reach 32.4N.
It is preferred that, heating-up temperature is 70~85 DEG C.The temperature can be such that carboxyl is reacted rapidly with amino.
It is preferred that, the input mass ratio of the carboxymethyl chitin and polyacrylamide is 1~8:1~20.
It is further preferred that the mass ratio of the carboxymethyl chitin, polyacrylamide and water is 1:10:30~1000.
It is preferred that, the concentration of the formalin is 35% (quality).
It is preferred that, the mass ratio of the suspension and formalin is 1:1.
It is preferred that, the quality of the polyphosphoric acid, formaldehyde and urea is 0.03~0.5:1~1.5:1.
It is preferred that, the degree of polymerization of the polyphosphoric acid is 10~45.
It is preferred that, add and 40~60min is reacted after polyphosphoric acid.
Another exemplary embodiment of the application has sustained release water conservation work(there is provided prepared by a kind of above-mentioned preparation method
The fertilizer of energy.After the fertilizer application is into soil, there can be longer fertilizer efficiency time.
It is preferred that, the granule strength of the fertilizer is 26~35N.
In order that the technical scheme of the application can clearly be understood by obtaining those skilled in the art, below with reference to tool
The embodiment of body describes the technical scheme of the application in detail.
Embodiment 1：
Prepare 1L water, when heating the water to 80 DEG C, be slowly added to carboxymethyl chitin 1g and polyacrylamide 10g, formed
Suspension；By the suspension and 35% formalin using mass ratio as 1:1 ratio is mixed, and is tuned into pasty state；Urea is added, instead
Homogeneous state should be formed, addition polyphosphoric acid (degree of polymerization 22) reacts 40 minutes afterwards, form reaction and form the replacement of homogeneous liquid state
Granulation water and steam and part nitrogen and phosphorus element, are added in composite fertilizer material and product are granulated and then obtained by Granulation Equipments
As there is the fertilizer of sustained release water retaining function, wherein formaldehyde, urea, the mass ratio of polyphosphoric acid are 1:1:0.2.
Fertilizer with sustained release water retaining function is compared with same content composite fertilizer and ureaformaldehyde composite fertilizer.
By determining, its pellet hardness reaches 32.4N, Common compound fertilizer 16N, ureaformaldehyde composite fertilizer 18N.
Pot experiment
Pot experiment is carried out using cucumber as trying plant, a common fertilizer group is set, one is delaying that embodiment 1 is produced
Release fertilizer group, a ureaformaldehyde group, every group of three parallel tests.The fertilizer applied is used as base manure.Surveyed every 10 days
Total nutrient situation, testing result in soil are measured as shown in figure 1, finding at the 30th day, the slow release fertilizer group that embodiment 1 is produced,
Its Nutrient change curve is changed into gentle state, and another two groups are shorter than 25 days.Illustrate the slow release fertilizer that embodiment 1 is produced, it is applied
After into soil, there can be longer fertilizer efficiency time.
Water conservation is tested
Influence of the different disposal to soil moisture content
Each processing shows soil basis determining analysis result table 1, using the fertilizer with sustained release water retaining function for
Improving middle level water content has positive effect, and soil moisture content can improve 11% compared with control treatment.With sustained release water conservation
Water-saving effect is also had differences between the soil fertility quality of function, measuring interpretation of result, and water retaining function fertilizer is sustained under equal conditions
Soil moisture content is handled to handle apparently higher than urea-formaldehyde compound fertilizer and certain brand water-retention fertilizer,
The different disposal soil basis determining of table 1 and analysis result (academy of agricultural sciences of Zaozhuang City testing site)
Embodiment 2
Prepare 500mL water, when heating the water to 75 DEG C, be slowly added to carboxymethyl chitin 1g and polyacrylamide 10g, shape
Into suspension；By the suspension and 35% formalin using mass ratio as 1:1 ratio is mixed, and is tuned into pasty state；Add urea,
Reaction forms homogeneous state, and addition polyphosphoric acid (degree of polymerization 45) reacts 40 minutes afterwards, forms reaction and forms homogeneous liquid state generation
For granulation water and steam and part nitrogen and phosphorus element, it is added in composite fertilizer material and granulates and then produced by Granulation Equipments
Product are the fertilizer with sustained release water retaining function, and wherein formaldehyde, urea, the mass ratio of polyphosphoric acid are 1.2:1:0.1.
Fertilizer with sustained release water retaining function is compared with same content composite fertilizer and ureaformaldehyde composite fertilizer.
By determining, its pellet hardness reaches 30.2N, and water content can improve 10%.
Embodiment 3
Prepare 100mL water, when heating the water to 85 DEG C, be slowly added to carboxymethyl chitin 1g and polyacrylamide 10g, shape
Into suspension；By the suspension and 35% formalin using mass ratio as 1:1 ratio is mixed, and is tuned into pasty state；Add urea,
Reaction forms homogeneous state, and addition polyphosphoric acid (degree of polymerization 30) reacts 40 minutes afterwards, forms reaction and forms homogeneous liquid state generation
For granulation water and steam and part nitrogen and phosphorus element, it is added in composite fertilizer material and granulates and then produced by Granulation Equipments
Product are the fertilizer with sustained release water retaining function, and wherein formaldehyde, urea, the mass ratio of polyphosphoric acid are 1.5:1:0.5.
Fertilizer with sustained release water retaining function is compared with same content composite fertilizer and ureaformaldehyde composite fertilizer.
By determining, its pellet hardness reaches 31.6N, and water content can improve 11%.
Embodiment 4
Prepare 30mL water, when heating the water to 70 DEG C, be slowly added to carboxymethyl chitin 1g and polyacrylamide 10g, shape
Into suspension；By the suspension and 35% formalin using mass ratio as 1:1 ratio is mixed, and is tuned into pasty state；Add urea,
Reaction forms homogeneous state, and addition polyphosphoric acid (degree of polymerization 10) reacts 40 minutes afterwards, forms reaction and forms homogeneous liquid state generation
For granulation water and steam and part nitrogen and phosphorus element, it is added in composite fertilizer material and granulates and then produced by Granulation Equipments
Product are the fertilizer with sustained release water retaining function, and wherein formaldehyde, urea, the mass ratio of polyphosphoric acid are 1.1:1:0.03.
Fertilizer with sustained release water retaining function is compared with same content composite fertilizer and ureaformaldehyde composite fertilizer.
By determining, its pellet hardness reaches 28.5N, and water content can improve 10%.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of preparation method of the fertilizer with sustained release water retaining function, it is characterized in that, by carboxymethyl chitin and polyacrylamide
Amine, which is added to the water, is thermally formed suspension, and formalin is added into suspension, is tuned into pasty state and obtains pasty liquid, into pasty liquid
Add after urea reaction and form the homogeneous liquid of homogeneous state, granulation after polyphosphoric acid is added into homogeneous liquid and is obtained has sustained release
The fertilizer of water retaining function.
2. preparation method as claimed in claim 1, it is characterized in that, heating-up temperature is 70~85 DEG C.
3. preparation method as claimed in claim 1, it is characterized in that, the input matter of the carboxymethyl chitin and polyacrylamide
Amount is than being 1~8:1~20.
4. preparation method as claimed in claim 3, it is characterized in that, the matter of the carboxymethyl chitin, polyacrylamide and water
Amount is than being 1:10:30~1000.
5. preparation method as claimed in claim 1, it is characterized in that, the concentration of the formalin is 35% (quality).
6. preparation method as claimed in claim 1, it is characterized in that, the mass ratio of the suspension and formalin is 1:1.
7. preparation method as claimed in claim 1, it is characterized in that, the quality of the polyphosphoric acid, formaldehyde and urea for 0.03~
0.5:1~1.5:1.
8. preparation method as claimed in claim 1, it is characterized in that, the degree of polymerization of the polyphosphoric acid is 10~45.
9. the fertilizer with sustained release water retaining function prepared by a kind of any described preparation method of claim 1~8.
10. fertilizer as claimed in claim 9, it is characterized in that, the granule strength of the fertilizer is 26~35N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710581335.0A CN107266195A (en) | 2017-07-17 | 2017-07-17 | It is a kind of that there is fertilizer of sustained release water retaining function and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710581335.0A CN107266195A (en) | 2017-07-17 | 2017-07-17 | It is a kind of that there is fertilizer of sustained release water retaining function and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107266195A true CN107266195A (en) | 2017-10-20 |
Family
ID=60072953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710581335.0A Pending CN107266195A (en) | 2017-07-17 | 2017-07-17 | It is a kind of that there is fertilizer of sustained release water retaining function and preparation method thereof |
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| CN (1) | CN107266195A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109734519A (en) * | 2019-03-15 | 2019-05-10 | 招远市金虹精细化工有限公司 | A kind of nutrient solution and its application method for administering grassland desertification |
| CN110041938A (en) * | 2019-05-15 | 2019-07-23 | 安徽华文塑胶科技有限公司 | A kind of heavy metal-polluted soil stabilizer and preparation method thereof |
| CN110981592A (en) * | 2019-12-23 | 2020-04-10 | 山东农业大学 | Novel water-retention slow-release nitrogen-phosphorus-potassium fertilizer and preparation method thereof |
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| CN102910991A (en) * | 2012-09-29 | 2013-02-06 | 湖北富邦科技股份有限公司 | Large-granule sustained-release ammonium chloride fertilizer, preparation method thereof and special granulating sustained-release material |
| CN104496685A (en) * | 2014-12-24 | 2015-04-08 | 金正大生态工程集团股份有限公司 | Preparation method of water retention type controlled-release urea formaldehyde compound fertilizer |
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| CN102910991A (en) * | 2012-09-29 | 2013-02-06 | 湖北富邦科技股份有限公司 | Large-granule sustained-release ammonium chloride fertilizer, preparation method thereof and special granulating sustained-release material |
| CN104496685A (en) * | 2014-12-24 | 2015-04-08 | 金正大生态工程集团股份有限公司 | Preparation method of water retention type controlled-release urea formaldehyde compound fertilizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109734519A (en) * | 2019-03-15 | 2019-05-10 | 招远市金虹精细化工有限公司 | A kind of nutrient solution and its application method for administering grassland desertification |
| CN110041938A (en) * | 2019-05-15 | 2019-07-23 | 安徽华文塑胶科技有限公司 | A kind of heavy metal-polluted soil stabilizer and preparation method thereof |
| CN110981592A (en) * | 2019-12-23 | 2020-04-10 | 山东农业大学 | Novel water-retention slow-release nitrogen-phosphorus-potassium fertilizer and preparation method thereof |
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| RJ01 | Rejection of invention patent application after publication |
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