CN107417406A - A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter and preparation method thereof - Google Patents
A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter and preparation method thereof Download PDFInfo
- Publication number
- CN107417406A CN107417406A CN201710750732.6A CN201710750732A CN107417406A CN 107417406 A CN107417406 A CN 107417406A CN 201710750732 A CN201710750732 A CN 201710750732A CN 107417406 A CN107417406 A CN 107417406A
- Authority
- CN
- China
- Prior art keywords
- organic matter
- slowly released
- nitrogen fertilizer
- containing organic
- released nitrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
-
- 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
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
-
- 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
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
- C05G5/37—Layered or coated, e.g. dust-preventing coatings layered or coated with a polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Fertilizers (AREA)
Abstract
The invention belongs to film-coated and slow release fertilizer technical field, more particularly to a kind of coating long-acting slowly released nitrogen fertilizer containing organic matter and preparation method thereof.It is high it is an object of the invention to solve existing for polyurethane coated fertilizer raw materials for production cost, polyurethane material addition and the more difficult grasp of coating rate in production process, and present in use for a long time using land pollution may be caused the problem of.The technical scheme is that using coating organic matter again outside layer of polyurethane.On the premise of with more preferably sustained release performance and acquisition time, this programme effectively reduces the usage amount of polyurethane material, and so as to reduce production cost and difficulty, while organic horizon can also provide organic matter nutrition for soil.The preparing raw material of the organic horizon is black liquid, binding agent and ammonification lignite, it makes use of papermaking waste material, and is easy to degrade, has the characteristics of energy-conserving and environment-protective.The product is applied to planting industry, and preparation method is prepared suitable for coated fertilizer.
Description
Technical field
The invention belongs to the invention belongs to film-coated and slow release fertilizer technical field, more particularly to a kind of coating containing organic matter are long-acting
Slow-release nitrogen fertilizer and preparation method thereof.
Background technology
For the current fertilizer in China based on quick-acting fertilizer, it is present easily occurs leaching, volatilization in soil, causes largely to seek
Support loss of elements problem so that utilization rate of fertilizer is extremely low, about 20-30%, and the nutrient being largely lost in rainwater
The environmental problems such as body eutrophication can also be caused.
In order to improve utilization rate of fertilizer, it has been developed that the new sustained-controll-release fertiliser of traditional quick-acting fertilizer is different from, it is main
Especially most commonly seen with coated carbamide if coated fertilizer, polyurethanes coat fertilizer fertilizer is relative to inorganic mineral salt bag at present
The polymer coated fertilizer such as film fertilizer such as sulfur-coated urea and Lauxite, polystyrene, polyethylene, polyvinyl chloride has because of it
Good slow release and without organic solvent, the advantages that film layer is degradable and favored by people.
But polyurethane coated fertilizer production is high there is also cost of material, production process addition and the more difficult palm of coating rate
Hold, the high easily stirring of addition is uneven and causes fertilizer agglomeration, and the low inadequate acquisition time of coating rate of addition does not reach requirement, and poly-
The urethane material natural decomposition cycle it is longer about 2-3, for a long time using land pollution may also be caused the problems such as.
The content of the invention
It is high for raw materials for production cost existing for above-mentioned polyurethane coated fertilizer, polyurethane material addition in production process
With the more difficult grasp of coating rate, and present in use for a long time using land pollution may be caused the problem of.The present invention provides
A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter, the use that polyurethane material is reduced using the addition of organic horizon are sustained simultaneously
Fertilizer can reach good slow release effect, and be provided with the organic matter beneficial to crop and soil, the utilization of papermaking wastewater and have in addition
The degraded that is easy to of machine matter layer has the characteristics of energy-conserving and environment-protective.
It is a further object of the present invention to provide a kind of preparation method of the coating long-acting slowly released nitrogen fertilizer containing organic matter.
The technical solution adopted by the present invention is as follows：
A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter, form as granular urea, be coated on outside the granular urea
Polyurethane film and the organic horizon being coated on outside the polyurethane film, the preparing raw material of the organic horizon is that papermaking is black
Liquid, binding agent and ammonification lignite.The particle size that the granular urea can select for 2-5mm granular urea.The technical side
Organic horizon is added in case can reduce the use of polyurethane material, so as to reduce due to polyurethane material largely using and cause
Production cost and production difficulty, the organic matter beneficial to plant growth can also be provided for soil.In addition the preparation profit of the fertilizer
With papermaking waste material, energy-conserving and environment-protective.
Preferably, paraffin layer has also been coated outside the organic horizon.Paraffin layer can make organic horizon difficult for drop-off more steady
It is fixed, be advantageous to improve the acquisition time of fertilizer.
It is further preferred that the mass ratio of the coating long-acting slowly released nitrogen fertilizer each component containing organic matter is：Urea 100
Part, polyurethane film 1-3 parts, organic horizon 5-10 parts, paraffin layer 0.8-5 parts.It can be reached in the program most using the ratio
Good fertilizer slow release effect and acquisition time.
Preferably, the mass ratio of the organic horizon raw material is：Black liquid 4-20 parts, binding agent 0.2-1 parts, ammonification
Lignite 12-20 parts.The organic horizon prepared from the ratio raw material has optimal sustained release performance and clad ratio, so as to further
Improve slow release effect and acquisition time.
Preferably, the black liquid composition is water 40-60wt% and alkali lignin 60-40wt%.Alkali lignin degradation time
Short, long-term use also will not contaminated soil and water body.In addition the black liquid of the concentration range can be more preferable in cladding process
Ground forms uniform clad in fertilizer surface, improves fertilizer acquisition time.
Preferably, the binding agent is one kind in polyethylene glycol, polyvinyl alcohol, polyacrylamide or carboxymethyl cellulose
It is or a variety of.Such as binding agent can be used as by the use of Macrogol 4000.As binding agent organic matter can be made more equal using these materials
It is even to be coated on fertilizer surface securely, clad ratio is improved, is advantageous to improve the sustained release performance and acquisition time of organic horizon.
Preferably, the granularity of the ammonification lignite is 30-100 mesh, and solvable content of humic acid is 8-20wt%.Organic horizon
The middle addition ammonification lignite not only can discharge nitrogen to soil, can also provide humic acid, enrich soil nutrient.
A kind of preparation method of the coating long-acting slowly released nitrogen fertilizer containing organic matter, its step are：
[1] granular urea, polyurethane coated dose of mixed liquor and crosslinker isocyanate is sequentially added into seed-coating machine to heat
Solidification；
[2] organic horizon raw material Hot-blast Heating is added to dry.
The seed-coating machine rotating speed may be selected 40-50 revs/min, and described be heating and curing may be selected 70 with the temperature of heat drying
℃-90℃.4-5 minutes may be selected in the time being heating and curing, and 3-4 minutes may be selected in the Hot-blast Heating drying time.Institute
The optional formula of the polyurethane coated dose of mixed liquor stated and crosslinker isocyanate one of which is：Commercially available castor oil, polypropylene glycol
400th, No. 58 paraffin, triethanolamine are according to mass ratio 7:1:1:0.05 prepares；The isocyanates is that polymethylene polyphenyl is different
Cyanate；The coating agent is 2 with polymethylene polyphenyl isocyanate ratio:1.
The preparation method has the following advantages that：Raw material type and the dosage of addition can be adjusted according to the actual requirements so as to controllable
Ground adjusts the composition and thickness of clad；Prepared clad parcel is uniform, and sustained release performance is good, acquisition time length；Prepared
Fertilizer does not lump, and particle disperses homogeneous, convenient use；The instrument and equipment that production needs is simple, and the cost of material is low；Without using organic
Solvent, it is environment-friendly.
Preferably, after the step of completing the preparation method, the mixing of paraffin fused solution is added.The paraffin can be selected 58
Number paraffin.This step can coat one layer of paraffin layer again outside the organic horizon.Organic horizon can be made difficult for drop-off, extend release
Phase.
Preferably, the technical process for adding the organic horizon raw material is：Black liquid is added with binding agent mixing liquid to turn
Ammonification lignite is added after dynamic 0.5-1 minutes, is repeated 2-3 times.In organic horizon prepared by the technique, component in black liquid with
Ammonification lignite is staggered, so as to more firmly with uniformly, effectively improving its sustained release performance and acquisition time.
Compared with prior art, the beneficial effect for the coating long-acting slowly released nitrogen fertilizer containing organic matter that the technical program provides
It is：Organic horizon is added, reduces the use of polyurethane material, so as to reduce production cost and production difficulty；There is provided for soil
The organic matter of useful crop plants growth；With excellent slow release effect and longer acquisition time；Organic horizon preparing raw material is available
Papermaking waste material, and organic horizon degradation time is short, therefore there is the advantages of energy-conserving and environment-protective.
Compared with prior art, the preparation method for the coating long-acting slowly released nitrogen fertilizer containing organic matter that the technical program provides
Beneficial effect is：Can adjust according to the actual requirements addition raw material type and dosage so as to controllably adjust clad composition and
Thickness；Prepared clad parcel is uniform, does not fall off firmly, and sustained release performance is good, acquisition time length；Prepared fertilizer is not tied
Block, particle disperse homogeneous, convenient use；The instrument and equipment needed is simple, and the cost of material is low；Without using organic solvent, environment friend
It is good.
Embodiment
The present invention is further explained with reference to specific embodiment, will be described the specific embodiment of the invention
Preferred process.
Embodiment 1
[1] according to castor oil, 400, No. 58 paraffin of polypropylene glycol and triethanolamine with mass ratio 7:1:1:0.05 be made into it is poly-
Urethane coating agent；
[2] according to black liquid and Macrogol 4000 with mass ratio 10:1 is configured to organic matter adhesive mixing liquid；
[3] 600g urea is added in seed-coating machine, seed-coating machine rotating speed is set to 40-50 revs/min, and blast heating is to 75 DEG C, successively
Polyurethane coated dose of mixed liquor 4g and crosslinker isocyanate 2g is added to solidify 4 minutes；
[4] ammonification is added after 6g organic matter adhesives mixing liquid is sprayed into during step [3] obtains product and rotates 0.5-1 minutes
Lignite 12g, repeat this step 3 time；
[5] addition No. 58 paraffin fused solutions of 12g are rotated further after step [4] being obtained into the drying in 4 minutes of product Hot-blast Heating
Mix within 2 minutes.
Embodiment 2
[1] according to castor oil, 400, No. 58 paraffin of polypropylene glycol and triethanolamine with mass ratio 7:1:1:0.05 be made into it is poly-
Urethane coating agent；
[2] according to black liquid and Macrogol 4000 with mass ratio 20:1 is configured to organic matter adhesive mixing liquid；
[3] 600g urea is added into seed-coating machine, 40-50 revs/min, blast heating sequentially adds polyurethane bag to 75 DEG C
Film mixed liquor 4g and crosslinker isocyanate 2g solidifies 4 minutes；
[4] obtain product in step [3] and spray into 6g organic matter adhesives mixing liquids and rotate 0.5-1 minutes to add ammonification lignite
12g, repeat this step 3 time；
[5] No. 58 paraffin fused solutions of 12g will be added after step [4] to product Hot-blast Heating drying in 4 minutes and is rotated further 2
Minute mixes.
Embodiment 3
[1] according to castor oil, 400, No. 58 paraffin of polypropylene glycol and triethanolamine with mass ratio 7:1:1:0.05 be made into it is poly-
Urethane coating agent；
[2] according to black liquid and Macrogol 4000 with mass ratio 10:1 is configured to organic matter adhesive mixing liquid；
[3] 600g urea is added into seed-coating machine, 40-50 revs/min, blast heating sequentially adds polyurethane bag to 80 DEG C
Film mixed liquor 8g and crosslinker isocyanate 4g solidifies 4 minutes；
[4] product penetrating 6g black liquids are obtained in step [3] and adds ammonification with binding agent mixing liquid rotation 0.5-1 minutes
Lignite 12g, repeat this step 3 time；
[5] addition No. 58 paraffin fused solutions of 12g are rotated further after step [4] being obtained into the drying in 4 minutes of product Hot-blast Heating
Mix within 2 minutes.
Embodiment 4
[1] according to castor oil, 400, No. 58 paraffin of polypropylene glycol and triethanolamine with mass ratio 7:1:1:0.05 be made into it is poly-
Urethane coating agent；
[2] according to black liquid and Macrogol 4000 with mass ratio 20:1 is configured to organic matter adhesive mixing liquid；
[3] 600g urea is added into seed-coating machine, 40-50 revs/min, blast heating sequentially adds polyurethane bag to 80 DEG C
Film mixed liquor 8g and crosslinker isocyanate 4g solidifies 4 minutes；
[4] product penetrating 6g black liquids are obtained in step [3] and adds ammonification with binding agent mixing liquid rotation 0.5-1 minutes
Lignite 12g, repeat this step 3 time；
[5] addition No. 58 paraffin fused solutions of 12g are rotated further after step [4] being obtained into the drying in 4 minutes of product Hot-blast Heating
Mix within 2 minutes.
Embodiment 5
[1] according to castor oil, 400, No. 58 paraffin of polypropylene glycol and triethanolamine with mass ratio 7:1:1:0.05 be made into it is poly-
Urethane coating agent；
[2] according to black liquid and Macrogol 4000 with mass ratio 10:1 is configured to organic matter adhesive mixing liquid；
[3] 600g urea is added into seed-coating machine, 40-50 revs/min, blast heating sequentially adds polyurethane bag to 90 DEG C
Film mixed liquor 12g and crosslinker isocyanate 6g solidifies 4 minutes；
[4] product penetrating 6g black liquids are obtained in step [3] and adds ammonification with binding agent mixing liquid rotation 0.5-1 minutes
Lignite 12g, repeat this step 3 time；
[5] addition No. 58 paraffin fused solutions of 12g are rotated further after step [4] being obtained into the drying in 4 minutes of product Hot-blast Heating
Mix within 2 minutes.
Embodiment 6
[1] according to castor oil, 400, No. 58 paraffin of polypropylene glycol and triethanolamine with mass ratio 7:1:1:0.05 be made into it is poly-
Urethane coating agent；
[2] according to black liquid and Macrogol 4000 with mass ratio 20:1 is configured to organic matter adhesive mixing liquid；
[3] 600g urea is added into seed-coating machine, 40-50 revs/min, blast heating sequentially adds polyurethane bag to 90 DEG C
Film mixed liquor 12g and crosslinker isocyanate 6g solidifies 4 minutes；
[4] product penetrating 6g black liquids are obtained in step [3] and adds ammonification with binding agent mixing liquid rotation 0.5-1 minutes
Lignite 12g, repeat this step 3 time；
[5] addition No. 58 paraffin fused solutions of 12g are rotated further after step [4] being obtained into the drying in 4 minutes of product Hot-blast Heating
Mix within 2 minutes.
Each embodiment and comparative example deenergized period such as table 1, comparative example are to be respectively containing only polyurethane coated layer coating quantity
1%th, 2%, 3% product, comparative example 1, comparative example 2, comparative example 3 are designated as successively；Determination method is according to standard HG/T4216-2011
It is measured.
It can be seen that embodiment 5 has significantly with the Recipe of embodiment 6 relative to comparative example Recipe to product slow release effect
Extend.Contrast the embodiment of close slow release effect and comparative example finds that the Recipe of embodiment 1 can be used, which to substitute comparative example 2, is formulated work
Skill, with the Recipe of embodiment 3 Recipe of comparative example 3 is substituted, about 150 yuan/ton of production cost can be saved after replacement.
Embodiment described above only expresses the embodiment of the application, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the application protection domain can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, on the premise of technical scheme design is not departed from, various modifications and improvements can be made, these belong to this
The protection domain of application.
Claims (10)
1. a kind of coating long-acting slowly released nitrogen fertilizer containing organic matter, form as granular urea, be coated on gathering outside the granular urea
Urethane film layer and the organic horizon being coated on outside the polyurethane film, it is characterised in that：The preparing raw material of the organic horizon
It is black liquid, binding agent and ammonification lignite.
2. according to the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 1, it is characterised in that：Outside the organic horizon
Paraffin layer is also coated.
3. according to the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 2, it is characterised in that：The mass ratio of each component
Example be：100 parts of urea, polyurethane film 1-3 parts, organic horizon 5-10 parts, paraffin layer 0.8-5 parts.
4. according to the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 1, it is characterised in that：The organic horizon system
It is for the mass ratio of raw material：Black liquid 4-20 parts, binding agent 0.2-1 parts, ammonification lignite 12-20 parts.
5. according to the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 1, it is characterised in that：The black liquid group
Into being water 40-60wt% and alkali lignin 60-40wt%.
6. according to the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 1, it is characterised in that：The binding agent is poly-
One or more in ethylene glycol, polyvinyl alcohol, polyacrylamide or carboxymethyl cellulose.
7. according to the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 1, it is characterised in that：The ammonification lignite
Granularity is 30-100 mesh, and solvable content of humic acid is 8-20wt%.
A kind of 8. preparation method of the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 1, it is characterised in that including
Following steps：
[1] granular urea, polyurethane coated dose of mixed liquor and crosslinker isocyanate is sequentially added into seed-coating machine to be heating and curing；
[2] organic horizon raw material Hot-blast Heating is added to dry.
9. according to the preparation method of the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 7, it is characterised in that：Complete
After the step [2], the mixing of paraffin fused solution is added.
10. according to the preparation method of the coating long-acting slowly released nitrogen fertilizer containing organic matter described in claim 8 or 9, it is characterised in that：
The technical process for adding the organic horizon raw material is：Add after black liquid rotates 0.5-1 minutes with binding agent mixing liquid and add
Enter ammonification lignite, repeat 2-3 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710750732.6A CN107417406A (en) | 2017-08-28 | 2017-08-28 | A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710750732.6A CN107417406A (en) | 2017-08-28 | 2017-08-28 | A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107417406A true CN107417406A (en) | 2017-12-01 |
Family
ID=60434581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710750732.6A Pending CN107417406A (en) | 2017-08-28 | 2017-08-28 | A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107417406A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109438070A (en) * | 2018-12-13 | 2019-03-08 | 广西农事帮农业有限公司 | A kind of slow-release nitrogen fertilizer granule and preparation method thereof |
| CN109896895A (en) * | 2019-04-03 | 2019-06-18 | 合肥工业大学 | A kind of preparation method of temperature control sustained-release nitrogenous fertilizer |
| CN110423168A (en) * | 2019-09-17 | 2019-11-08 | 深圳市芭田生态工程股份有限公司 | Nitro-compound fertilizer and preparation method thereof |
| CN111646869A (en) * | 2020-05-28 | 2020-09-11 | 华南农业大学 | Polyurethane coated fertilizer and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101062878A (en) * | 2006-04-30 | 2007-10-31 | 中国科学院过程工程研究所 | Degradable natural organic matter bundled slow-releasing fertilizer and preparation method and usage thereof |
| CN106316639A (en) * | 2016-08-29 | 2017-01-11 | 贵阳开磷化肥有限公司 | Preparation method of controlled-release fertilizer for plums |
-
2017
- 2017-08-28 CN CN201710750732.6A patent/CN107417406A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101062878A (en) * | 2006-04-30 | 2007-10-31 | 中国科学院过程工程研究所 | Degradable natural organic matter bundled slow-releasing fertilizer and preparation method and usage thereof |
| CN106316639A (en) * | 2016-08-29 | 2017-01-11 | 贵阳开磷化肥有限公司 | Preparation method of controlled-release fertilizer for plums |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109438070A (en) * | 2018-12-13 | 2019-03-08 | 广西农事帮农业有限公司 | A kind of slow-release nitrogen fertilizer granule and preparation method thereof |
| CN109896895A (en) * | 2019-04-03 | 2019-06-18 | 合肥工业大学 | A kind of preparation method of temperature control sustained-release nitrogenous fertilizer |
| CN110423168A (en) * | 2019-09-17 | 2019-11-08 | 深圳市芭田生态工程股份有限公司 | Nitro-compound fertilizer and preparation method thereof |
| CN111646869A (en) * | 2020-05-28 | 2020-09-11 | 华南农业大学 | Polyurethane coated fertilizer and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107417406A (en) | A kind of coating long-acting slowly released nitrogen fertilizer containing organic matter and preparation method thereof | |
| CN101781134B (en) | Tower-smelt organic-inorganic compound fertilizer and preparation method thereof | |
| CN101357867B (en) | Humic acid membrane wrapping control-releasing fertilizer | |
| CN103333006B (en) | Compound fertilizer controlled release coated agent | |
| CN106800472B (en) | Composite modified polyurethane coating liquid, controlled-release fertilizer and preparation method thereof | |
| CN101270013A (en) | Preparation for coating material for nitrogenous fertilizer and coating method thereof | |
| CN101357866A (en) | Humic acid control-releasing fertilizer and method of preparing the same | |
| CN102424633A (en) | Self-curing film-coated controlled release fertilizer and preparation method thereof | |
| CN102826914A (en) | Slow-release water supply type fertilizer and application thereof | |
| CN104447027A (en) | Preparation method of in-situ reaction film-forming and hole-forming type controlled-release fertilizers | |
| CN103435425B (en) | Hierarchical slow release multielement fertilizer and manufacturing process thereof | |
| CN103694038A (en) | Value-added humic acid urea and preparation method thereof | |
| CN105461429A (en) | Coated controlled-release fertilizer and preparation method thereof | |
| CN103242090A (en) | Environment-friendly type coated slow-released fertilizer and preparation method thereof | |
| CN106396939A (en) | Soil fertilizing improving agent for saline-alkali soil and preparation of improving agent | |
| CN101993289A (en) | Moisture-holding nutritive soil and preparation method thereof | |
| CN106431612B (en) | A kind of aquatic crops class Controlled Release Fertilizer preparation method | |
| CN107311755B (en) | Special long-acting fertilizer for improving salt tolerance of saline-alkali soil crops and preparation method thereof | |
| CN105036878B (en) | Potted anthurium andraeanum coated controlled release fertilizer and preparation method thereof | |
| CN101830761B (en) | Controlled release fertilizer special for soilless culture of leaf vegetables and preparation method thereof | |
| CN107082716A (en) | It is a kind of can activating soil increment urea and preparation method thereof | |
| CN103360184B (en) | A kind of anti-burning type corn-specific controlled-release fertilizer and preparation method thereof and application | |
| CN102786366B (en) | Endoplasmic slow release composite fertilizer and its preparation method | |
| CN102173960B (en) | Special controlled-release fertilizer for cool-season lawns and preparation method thereof | |
| CN107673868A (en) | A kind of capsicum microbial fertilizer special and its production technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171201 |