CN106083327A - A kind of zinc-rich coated fertilizer and its preparation method and zinc-rich film-coated controlled release fertilizer and its preparation method - Google Patents
A kind of zinc-rich coated fertilizer and its preparation method and zinc-rich film-coated controlled release fertilizer and its preparation method Download PDFInfo
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- CN106083327A CN106083327A CN201610410471.9A CN201610410471A CN106083327A CN 106083327 A CN106083327 A CN 106083327A CN 201610410471 A CN201610410471 A CN 201610410471A CN 106083327 A CN106083327 A CN 106083327A
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- fertilizer
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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
-
- 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
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
- C05D9/02—Other inorganic fertilisers containing trace elements
-
- 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
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
Abstract
The invention belongs to fertilizer controlled release field, be specifically related to a kind of zinc-rich coated fertilizer and its preparation method and zinc-rich film-coated controlled release fertilizer and its preparation method.This zinc-rich coated fertilizer includes each raw material of following parts by weight: starch 65 80 parts；Folium Nelumbinis powder 5 15 parts；Chelated zinc 15 parts；15 parts of Radix Rubiae powder；Humic acid 0 10 parts；Cross-linking agent 0.2 5 parts.This zinc-rich film-coated controlled release fertilizer is made up of the zinc-rich peplos of fertilizer core and coated fertilizer nuclear core, and fertilizer core is water-soluble granular fertilizer, and zinc-rich peplos is made up of above-mentioned zinc-rich coated fertilizer.The present invention is with macromolecular materials such as starch cheap, eco-friendly, Folium Nelumbinis powder, humic acid as primary raw material, it is aided with chelated zinc and Radix Rubiae Chinese medicine ingredients, by being blended and it being carried out cross-linking modified, prepare zinc-rich coated fertilizer and zinc-rich film-coated controlled release fertilizer, this coated fertilizer can extend its time being dissolved in water and the degradation time in water thereof effectively, it is achieved the zinc element itself comprised and the slow release of the fertilizer of cladding thereof.
Description
Technical field
The invention belongs to fertilizer controlled release field, be specifically related to a kind of zinc-rich coated fertilizer and its preparation method and zinc-rich bag
Sustained controlling fertilizer and its preparation method.
Background technology
Nowadays, chemical fertilizer has played great effect in the plantation of crops, can not only reduce pest and disease damage, moreover it is possible to improve
Crop yield；Meanwhile, loss of chemical fertilizer, volatilization cause chemical fertilizer not fully absorbed utilization by plant, also create the big of environment
Amount is polluted.Therefore, novel sustained-controll-release fertiliser be developed into for research emphasis, to change the characteristic of chemical fertilizer self to improve fertilizer
Utilization rate reduce the pollution of environment.Sustained-controll-release fertiliser achieves fertilizer nutrient release, soil nutrient supply and plant nutrient
The balance absorbed and coordination, improve the utilization rate of fertilizer, and alleviate the unreasonable fertilising pollution to environment, simultaneously can one
Secondary property is applied fertilizer, and decreases labour costs, is more convenient under conditions of China's agricultural decentralized management promoting.For now, peplos
Coating class sustained-controll-release fertiliser represents the development trend of sustained-controll-release fertiliser.In the manufacture process of coated fertilizer, coated fertilizer leads to
Chang Buyu fertilizer generation chemical reaction, by the cladding of physics, adjusts component and the structure of coated fertilizer, moreover it is possible to regulate its release
The characteristic of fertilizer, has big advantage technically and economically.But coating type sustained-controll-release fertiliser is by coated fertilizer and work
The restriction of skill, improves the cost of fertilizer, so limiting its extensive application in such a large agricultural country of China.Cause
This, select low price, soil and water source are not polluted, biodegradable macromolecular material is increasingly closed by people
Note.
Zinc is that animal, plant and growth in humans grow required trace element, and is three kinds the most easily lacked in people
Trace elements zn, VA, Fe one of them.A series of diseases that zinc deficiency causes are increasingly by global concern and attention.Zinc
Element plays an important role in gene expression, duplication and cell grow.Zinc affects the activity of internal multiple enzyme, and joins
With protein and the synthesis of nucleic acid, thus affect division and the growth of cell.Plant zinc deficiency can cause product quality to decline, and people
Body zinc deficiency may result in a series of metabolism disorders such as short stature.Therefore, the cereal crops such as the Oryza sativa L. planting out zinc-rich are to solution
Certainly this problem is the approach of one i.e. economy material benefit again.In chemical fertilizer, zinc supplement is an indirect human body Zn content important channel of improving, so
And plant is relatively slow and a small amount of to the absorptance of zinc, so zinc element is coated in cheap slow controlled release coated fertilizer, will
It is a direction being worth research that the absorption of zinc brings up to maximize.
Summary of the invention
The technical problem to be solved is to provide.
The technical scheme is that a kind of zinc-rich coated fertilizer, it is characterised in that include
Each raw material of following parts by weight: starch 65-80 part；Folium Nelumbinis powder 5-15 part；Chelated zinc 1-5 part；Radix Rubiae powder 1-5 part；Humic acid
0-10 part；Cross-linking agent 0.2-5 part.
On the basis of technique scheme, the present invention can also do materialization further below or optimization.
Preferably, described starch is wheaten starch or potato starch.
Preferably, described cross-linking agent be in N, N '-methylene-bisacrylamide and glycerol one or both arbitrarily than
The mixing of example.
Concrete, the mean diameter of described Folium Nelumbinis powder is 60-150 mesh, and the mean diameter of described Radix Rubiae powder is 30-80 mesh.
The present invention also provides for the method preparing above-mentioned zinc-rich coated fertilizer, comprises the steps: according to described zinc-rich peplos
Each raw material weight number in material weighs starch, Folium Nelumbinis powder, chelated zinc, Radix Rubiae powder, humic acid and cross-linking agent, the shallow lake that will weigh
Powder, Folium Nelumbinis powder, chelated zinc, Radix Rubiae powder, humic acid are sufficiently mixed in a kettle. with suitable quantity of water, and the weight of water is each in reactor
4-9 times of raw material weight sum；It is warming up to 60-90 DEG C and gelatinizing at such a temperature；The friendship weighed is added in described reactor
Connection agent, reflux at 90-100 DEG C 2-3h, crosslinks reaction；Stirring, cooling discharging, obtain described zinc-rich coated fertilizer.
The present invention also provides for a kind of zinc-rich film-coated controlled release fertilizer, by fertilizer core and the zinc-rich of the described fertilizer core of cladding
Peplos forms, and described fertilizer core is water-soluble granular fertilizer, the zinc-rich that described zinc-rich peplos is prepared by above-mentioned preparation method
Coated fertilizer is made.
On the basis of technique scheme, the present invention can also do and optimize further below.
Further, the weight of described zinc-rich peplos is the 2-30% of described zinc-rich film-coated controlled release fertilizer weight.
Further, described water-soluble granular fertilizer is single fertilizer, compound fertilizer or complex fertilizer, described water-soluble granular
The mean diameter of the granule of fertilizer is 2-5mm.Described single fertilizer is nitrogenous fertilizer, phosphate fertilizer or potash fertilizer, such as carbamide, calcium superphosphate and sulfur
Acid potassium etc., described compound fertilizer is potassium nitrate, potassium phosphate or ammonium phosphate etc..
The present invention also provides for a kind of method preparing above-mentioned zinc-rich film-coated controlled release fertilizer, comprises the steps: in boiling
In formula or rotary drum fluid bed, the zinc-rich coated fertilizer using the present invention to prepare is coated with described water soluble fertilizer granule.
On the basis of technique scheme, the present invention can also do and optimize further below.
Further, in described fluid bed, temperature is 50-95 DEG C, and described zinc-rich coated fertilizer is coated with described water soluble fertilizer
Spraying method is used to carry out during grain.
Compared with prior art, the invention has the beneficial effects as follows: in the present invention with starch cheap, eco-friendly, Folium Nelumbinis
The macromolecular material such as powder, humic acid is primary raw material, is aided with chelated zinc and Radix Rubiae Chinese medicine ingredients, by being blended and handing over it
Connection modification, prepares zinc-rich coated fertilizer and zinc-rich film-coated controlled release fertilizer.Because Folium Nelumbinis powder surface is one layer of super-drainage structure,
Obtained zinc-rich coated fertilizer has certain water-proof function, it is possible to effectively extend its time being dissolved in water and in water
Degradation time, it is achieved the zinc element that itself comprises and the slow release of the fertilizer of cladding thereof；And the Radix Rubiae tool added
There is the effect of antibiotic and sterilizing, reduce the pest and disease damage of plant root, thus ensure the plant absorption to fertilizer.By this zinc-rich peplos
Material is coated on chemical fertilizer and obtains zinc-rich film-coated controlled release fertilizer, adjusts zinc-rich coated fertilizer in this richness according to demand of plant growth
Content in zinc film-coated controlled release fertilizer, when effectively controlling the release of the fertilizer of zinc element and its cladding in zinc-rich coated fertilizer
Between, thus improve the utilization ratio of fertilizer and zinc element, and its environmentally safe, it is a kind of zinc-rich with DEVELOPMENT PROSPECT
Sustained-controll-release fertiliser.
Detailed description of the invention
Being described principle and the feature of the present invention below in conjunction with specific embodiment, example is served only for explaining this
Bright, it is not intended to limit the scope of the present invention.
If method used in the present invention is conventional method as specified otherwise, if material therefor of the present invention do not make special
Illustrate then for commercially available prod.
For avoiding repeating, the slow controlled release properties of the zinc-rich film-coated controlled release fertilizer obtained in following example is all by following
Method is tested: under conditions of 25 DEG C, uses the fertilizer releasing period of water-extraction method test zinc-rich film-coated controlled release fertilizer, with accumulation
Nutrient release rate when reaching 80% required natural law represent, and test zinc element release rate and reach required sky during zinc total content 80%
Number.The zinc-rich film-coated controlled release fertilizer (total amount of its nitrogenous, phosphorus or potassium can calculate) of a certain amount of development is put into a certain amount of
Water in, constantly in monitoring water the total content of corresponding nitrogen, phosphorus or potassium until it accounts for phase in described zinc-rich film-coated controlled release fertilizer
Stop monitoring when answering the 80% of element total amount, record corresponding natural law), by the total content of GB/T8572-2001 standard testing nitrogen, press
The total content of GB/T8573-1999 standard testing phosphorus, by the total content of GB/T8574-1988 standard testing potassium.By inductance coupling
Close plasma emission spectrometer (ICP-AES) and measure the content of zinc element.
Embodiment 1
(1) preparation of zinc-rich coated fertilizer
Distilled water 8L, wheaten starch 800g, Folium Nelumbinis powder 150g, chelated zinc 50g, Radix Rubiae powder 50g, humic acid 100g are added
In reactor with agitator, thermometer, condenser and heater, after being stirred at room temperature 1 hour, it is heated at 60 DEG C sticking with paste
Change, add cross-linking agent N, N '-methylene-bisacrylamide 20g and glycerol 30g, reflux 2-3 hour at 90 DEG C, cool down out
Material, to obtain final product.
(2) preparation of zinc-rich film-coated controlled release fertilizer
The granular urea that 5kg particle diameter is 3～4mm is loaded in boiling type fluid bed, is preheated to 80 DEG C, by above-mentioned zinc-rich bag
Membrane material 5kg sprays to granular urea surface from double flowing nozzle, and spraying rate is about 30g/min, advertises hot air drying simultaneously,
Hot blast temperature is 90 DEG C, obtains zinc-rich film-coated controlled release fertilizer, constitutes the fertilizer core of described zinc-rich film-coated controlled release fertilizer
Granular urea surface has zinc-rich peplos, and the weight of described zinc-rich peplos is described zinc-rich film-coated controlled release fertilizer gross weight
13.2%.
After testing, the fertilizer releasing period (detection nitrogen Element release) of the zinc-rich film-coated controlled release fertilizer of above-mentioned preparation is 69
My god, the natural law of zinc release 80% is 51 days.
Embodiment 2
(1) preparation of zinc-rich coated fertilizer
Distilled water 6.5L, wheaten starch 650g, Folium Nelumbinis powder 50g, chelated zinc 10g, Radix Rubiae powder 10g, humic acid 10g are added
In reactor with agitator, thermometer, condenser and heater, after being stirred at room temperature 1 hour, it is heated at 60 DEG C sticking with paste
Change, add cross-linking agent N, N '-methylene-bisacrylamide 1g and glycerol 1g, reflux 2-3 hour at 90 DEG C, cool down out
Material, to obtain final product.
(2) preparation of zinc-rich film-coated controlled release fertilizer
The granular urea that 5kg particle diameter is 3～4mm is loaded in boiling type fluid bed, is preheated to 80 DEG C, by above-mentioned zinc-rich bag
Membrane material 1kg sprays to granular urea surface from double flowing nozzle, and spraying rate is about 30g/min, advertises hot air drying simultaneously,
Hot blast temperature is 90 DEG C, obtains zinc-rich film-coated controlled release fertilizer, constitutes the fertilizer core of described zinc-rich film-coated controlled release fertilizer
Granular urea surface has zinc-rich peplos, and the weight of described zinc-rich peplos is described zinc-rich film-coated controlled release fertilizer gross weight
2.1%.
After testing, the fertilizer releasing period (detection nitrogen Element release) of the zinc-rich film-coated controlled release fertilizer of above-mentioned preparation is 52
My god, the natural law of zinc release 80% is 41 days.
Embodiment 3
(1) preparation of zinc-rich coated fertilizer
Distilled water 4L, wheaten starch 750g, Folium Nelumbinis powder 100g, chelated zinc 30g, Radix Rubiae powder 30g, humic acid 1g are added band
Have in the reactor of agitator, thermometer, condenser and heater, after being stirred at room temperature 1 hour, be heated to gelatinizing at 90 DEG C,
Add cross-linking agent N, N '-methylene-bisacrylamide 15g and glycerol 10g, reflux 2-3 hour at 100 DEG C, cool down out
Material, to obtain final product.
(2) preparation of zinc-rich film-coated controlled release fertilizer
The granular urea that 5kg particle diameter is 3～4mm is loaded in boiling type fluid bed, is preheated to 80 DEG C, by above-mentioned zinc-rich bag
Membrane material 7kg sprays to granular urea surface from double flowing nozzle, and spraying rate is about 30g/min, advertises hot air drying simultaneously,
Hot blast temperature is 90 DEG C, obtains zinc-rich film-coated controlled release fertilizer, constitutes the fertilizer core of described zinc-rich film-coated controlled release fertilizer
Granular urea surface has zinc-rich peplos, and the weight of described zinc-rich peplos is described zinc-rich film-coated controlled release fertilizer gross weight
26.5%.
After testing, the fertilizer releasing period (detection nitrogen Element release) of the zinc-rich film-coated controlled release fertilizer of above-mentioned preparation is 75
My god, the natural law of zinc release 80% is 55 days.
Embodiment 4
With embodiment 3, but replace wheaten starch with potato starch.
After testing, the fertilizer releasing period (detection nitrogen Element release) of the zinc-rich film-coated controlled release fertilizer of above-mentioned preparation is 58
My god, the natural law of zinc release 80% is 38 days.
Embodiment 5
With embodiment 3, but cross-linking agent only uses 30g glycerol.
After testing, the fertilizer releasing period (detection nitrogen Element release) of the zinc-rich film-coated controlled release fertilizer of above-mentioned preparation is 72
My god, the natural law of zinc release 80% is 54 days.
Comparative example 1
With embodiment 3, do not use Radix Rubiae powder.
After testing, the fertilizer releasing period (detection nitrogen Element release) of the zinc-rich film-coated controlled release fertilizer of above-mentioned preparation is 78
My god, the natural law of zinc release 80% is 57 days.
Comparative example 2
With embodiment 3, but do not use Folium Nelumbinis powder.
After testing, the fertilizer releasing period (detection nitrogen Element release) of the zinc-rich film-coated controlled release fertilizer of above-mentioned preparation is 35
My god, the natural law of zinc release 80% is 30 days.
Fertilizer efficiency is tested
Choosing eight pieces of identical rice fields of early growth condition, in it, rice seedlings height is close, is each about 5cm, complete
Cultivating under exactly the same external condition, embodiment 1-5 of equal in quality is used in the first seven block rice field respectively and prepared by comparative example 1-2
Coated fertilizer, the richness of average quality after the carbamide of the non-peplos of average quality after conversion and conversion is directly used in last block rice field
Zinc coated fertilizer, grows and within two months, records the average plant height of several pieces of water in field rice seedlings after (based on 60 days) respectively as follows (by above-mentioned
The sequencing arrangement of embodiment and comparative example, is finally the zinc-rich coated fertilizer of non-coated carbamide and respective quality): 85cm,
78cm, 83cm, 82cm, 85cm, 73cm, 70cm and 65cm.Knowable to above-mentioned data, the zinc-rich bag sustained controlling that the present invention provides
Fertilizer can slowly discharge, and contributes to plant absorption and growth；When not using Radix Rubiae powder or do not use Folium Nelumbinis powder, Plant Height of Rice is all subject to
To adverse effect；The Plant Height of Rice directly using the carbamide of non-peplos and zinc-rich coated fertilizer is the shortest, this is because its fertilizer is released
Letting slip fast, part fertilizer runs off without plant absorption.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. a zinc-rich coated fertilizer, it is characterised in that include each raw material of following parts by weight: starch 65-80 part；Folium Nelumbinis powder
5-15 part；Chelated zinc 1-5 part；Radix Rubiae powder 1-5 part；Humic acid 0-10 part；Cross-linking agent 0.2-5 part.
A kind of zinc-rich coated fertilizer the most according to claim 1, it is characterised in that described starch is wheaten starch or Rhizoma Solani tuber osi
Starch.
A kind of zinc-rich coated fertilizer the most according to claim 1, it is characterised in that described cross-linking agent is N, N '-methylene
The mixing of one or both arbitrary proportions in bisacrylamide and glycerol.
A kind of zinc-rich coated fertilizer the most according to claim 1, it is characterised in that the mean diameter of described Folium Nelumbinis powder is
60-150 mesh, the mean diameter of described Radix Rubiae powder is 30-80 mesh.
5. the preparation method of a zinc-rich coated fertilizer, it is characterised in that comprise the steps: by any one of Claims 1-4
Each raw material weight number in described zinc-rich coated fertilizer weighs starch, Folium Nelumbinis powder, chelated zinc, Radix Rubiae powder, humic acid and crosslinking
Agent, is sufficiently mixed with suitable quantity of water in a kettle. by the starch weighed, Folium Nelumbinis powder, chelated zinc, Radix Rubiae powder, humic acid, the weight of water
Amount is in reactor 4-9 times of each raw material weight sum；It is warming up to 60-90 DEG C and gelatinizing at such a temperature；To described reactor
The cross-linking agent that interior addition weighs, reflux at 90-100 DEG C 2-3h, crosslinks reaction；Stirring, cooling discharging, obtain described richness
Zinc coated fertilizer.
6. a zinc-rich film-coated controlled release fertilizer, it is characterised in that by fertilizer core and the richness being coated on outside described fertilizer core
Zinc peplos forms, and described fertilizer core is water-soluble granular fertilizer, the zinc-rich bag that described zinc-rich peplos is prepared by claim 5
Membrane material is made.
A kind of zinc-rich film-coated controlled release fertilizer the most according to claim 6, it is characterised in that the weight of described zinc-rich peplos
2-30% for described zinc-rich film-coated controlled release fertilizer weight.
A kind of zinc-rich film-coated controlled release fertilizer the most according to claim 6, it is characterised in that described water-soluble granular fertilizer
For single fertilizer, compound fertilizer or complex fertilizer, the mean diameter of the granule of described water-soluble granular fertilizer is 2-5mm.
9. the preparation method of a zinc-rich film-coated controlled release fertilizer, it is characterised in that comprise the steps: at boiling type or rotary drum
In formula fluid bed, using the zinc-rich coated fertilizer coated fertilizer nuclear core that claim 5 is prepared, described fertilizer core is water solublity
Granulated fertilizer.
The preparation method of a kind of zinc-rich film-coated controlled release fertilizer the most according to claim 9, it is characterised in that described stream
In changing bed, temperature is 50-95 DEG C, uses spraying method to carry out when described zinc-rich coated fertilizer is coated with described water soluble fertilizer granule.
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| CN201610410471.9A CN106083327A (en) | 2016-06-13 | 2016-06-13 | A kind of zinc-rich coated fertilizer and its preparation method and zinc-rich film-coated controlled release fertilizer and its preparation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373387A (en) * | 2018-05-02 | 2018-08-07 | 武汉辅创科技有限公司 | A kind of sustained and controlled release chemical fertilizer and preparation method thereof with antibacterial action |
| CN108947705A (en) * | 2018-09-27 | 2018-12-07 | 汪添法 | A kind of production method of coated slow-release type biological high-efficiency organic fertilizer |
| CN115427377A (en) * | 2020-03-31 | 2022-12-02 | 沙特基础工业全球技术公司 | Zinc-coated urea fertilizer |
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| CN105237221A (en) * | 2015-10-26 | 2016-01-13 | 湖北大学 | Rare earth element-rich coating material and preparation method and application thereof |
| CN105272602A (en) * | 2015-10-22 | 2016-01-27 | 湖北大学 | Starch and lotus leaf powder blended coating material as well as preparation method and application thereof |
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- 2016-06-13 CN CN201610410471.9A patent/CN106083327A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105272602A (en) * | 2015-10-22 | 2016-01-27 | 湖北大学 | Starch and lotus leaf powder blended coating material as well as preparation method and application thereof |
| CN105237221A (en) * | 2015-10-26 | 2016-01-13 | 湖北大学 | Rare earth element-rich coating material and preparation method and application thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373387A (en) * | 2018-05-02 | 2018-08-07 | 武汉辅创科技有限公司 | A kind of sustained and controlled release chemical fertilizer and preparation method thereof with antibacterial action |
| CN108947705A (en) * | 2018-09-27 | 2018-12-07 | 汪添法 | A kind of production method of coated slow-release type biological high-efficiency organic fertilizer |
| CN115427377A (en) * | 2020-03-31 | 2022-12-02 | 沙特基础工业全球技术公司 | Zinc-coated urea fertilizer |
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