CN106380314A - Insect-proofing charcoal rot slow-release urea - Google Patents
Insect-proofing charcoal rot slow-release urea Download PDFInfo
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- CN106380314A CN106380314A CN201610784416.6A CN201610784416A CN106380314A CN 106380314 A CN106380314 A CN 106380314A CN 201610784416 A CN201610784416 A CN 201610784416A CN 106380314 A CN106380314 A CN 106380314A
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- Prior art keywords
- slow
- coating agent
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- carbamide
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/60—Biocides or preservatives, e.g. disinfectants, pesticides or herbicides; Pest repellants or attractants
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Plant Pathology (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Fertilizers (AREA)
Abstract
The invention aims to provide insect-proofing charcoal rot slow-release urea. The technical scheme comprises that the slow-release urea is composed of 1 to 5.5 parts by mass of a slow-release film-coating agent and 94.5 to 99 parts by mass of urea. The slow-release film-coating agent comprises the raw materials: activated humic acid, biochar, glucomannan, dextrin, glycerol and water. The insect-proofing charcoal rot slow-release urea has the beneficial effects that the film-coating agent plays a role in slow-releasing urea nutrients, prolongs the urea nutrient release period and reduces the operation process of fertilizer application. Humic acid in the film-coating agent has an effect of inhibiting on the activity of urease on decomposing urea, the ammonia stability performance is kept, and nutrients are released gradually. Biochar can play roles in improving the soil ability and keeping the balance of water and fertilizers, and also has the effect of expelling insects.
Description
Technical field
The present invention relates to agrochemical technical field, more particularly, to a kind of insect protected charcoal corruption slow-release carbamide.
Background technology
Carbamide, molecular formula is CO (NH2)2, molecular mass 60.Carbamide is soluble in water, solvable in 100 milliliters of water when 20 DEG C
105 grams of solution, aqueous solution is in neutral reaction.
Carbamide is organic nitrogenous fertilizer, is current nitrogen content highest nitrogenous fertilizer it is adaptable to making base manure and topdressing, as in one kind
Property fertilizer, carbamide is applied to various soil and plant.It easily preserves, easy to use, and the destruction to soil is little, is to make at present
A kind of chemical nitrogen fertilizer of large usage quantity.In practical application, improve the utilization rate of carbamide using slow release method.
Existing slow release method is mainly by the way of peplos, and coated fertilizer includes inorganic matters peplos and Organic substance bag
Film.Wherein, sulfur Wrapped fertilizer (the sulfur or metal sulfide) slow release effect of inorganic matters peplos is bad, easily makes soil acidification；Have
The machine compound such as coated fertilizer such as resin, rubber, life-time service will also result in environmental pollution.
In recent years, humic acidss cause excellent performance to cause the concern of fertilizer industry, are referred to as the slow releasing agent of nitrogenous fertilizer, phosphorus
Fertile synergist, the protective agent of potash fertilizer.Amido (R-NH2) in humic acidss molecule, phenolic hydroxyl group (phenol-OH), quinonyl (O=phenyl ring
=O) it is the crucial group that carbamide is combined with urase, combine with urease activity position sulfydryl (R-SH), suppression urase divides to carbamide
The activity of solution, keeps ammonia stability, so that nutrient is progressively discharged, for Crop, will not cause because of the excess supply of nitrogenous fertilizer
The accumulation of NO3-N and NO2-N.The complexing of humic acidss is very strong, can be by forming chelating with ferrum, aluminum, calcium plasma
Thing stores the ferrum phosphorus of state and aluminum phosphorus becomes the stronger phosphorus of activity moreover it is possible to make the calcium phosphorus in calacareous soil so that closing in acid ground
Become available P, on the one hand improve the biological activity of ferrum, calcium ion, on the other hand improve the fertilizer efficiency of phosphate fertilizer.Also simultaneously
Soil can be suppressed to potassium fixation, improve the utilization rate of potash fertilizer, and using this property moreover it is possible to buffering saline and alkaline to crop
Harm.Additionally, humic acidss can also improve the physical propertys such as soil aeration, water resistance and tilth, improve soil water-reataining fertilizer-keeping
Ability, deepens soil color, strengthens heat absorption capacity, improves the functions such as the soil moisture.
A great problem in application process for the humic acidss is the reaction of humic acidss and carbamide：Carbamide easily reacts powder with humic acidss
Change, deliquescence and lost efficacy.Therefore, how to prevent the reaction of humic acidss and carbamide, be the key of exploitation high-performance slow release fertilizer.
Under study for action it was also found that the humic acidss after activation have more rich organic matter and-OH ,-COOH isoreactivity
Functional group, is more beneficial for the performance of performance.《Applied research in fertilizer production for the humic acidss activation modification technology》、《In raw coal
The activation processing research of humic acidss》All it is described in detail Deng journal of writings, Chinese patent 104892309A, 105819952A.
104892309A gives ammonating process, and described spray activation humic acid urea fused solution raw material components weight portion is as follows：Carbamide
500-600 part, ammonium sulfate 50-100 part, humic acidss 150-300 part, water 30-100 part.105819952A points out, activation humic
Sour bio-bacterial manure it is characterised in that：Described mycopowder is the microbial bacteria bacillus subtilis (Bacillus for fertilizer field
Subtilis), Bacillus megaterium (Bacillus megaterium) and glue old sample bud pole bacterium (Bacillus
Mucilagimosus krassilm) one of or two or more.
Charcoal has a physicochemical property of uniqueness, such as larger specific surface area, higher carbon content, have chemical inertness and
Biological stability.Agricultural wastes are converted into charcoal, turn waste into wealth, that is, solve the recovery of agricultural crop straw the like waste
Utilizing question, solves burning again and negatively affects hence it is evident that reducing the discharge capacity of carbon dioxide in air to what environment brought, and
And can enduringly keep carbon stability, play and increase the effect reducing discharging that converges.
Charcoal is added in soil, rich water equilibrium can be reconciled with the water and nutrient in accumulation soil, so that crop is increased
New root, has airing function and the drainage of improved soil, so that oxygen is supplied fully.Simultaneously also can be to organic and inorganic in soil
The Transport And Transformation of pollutant impacts, and promotes soil to the absorption of nutrient ion and holding, decreases because fertilising is to water body
Eutrophication impact and soil pollution of area source, are conducive to the sustainable development of agricultural.Biological carbon surface can generate a lot of root grains
Bacterium, more effectively can remove root insect pest, and such as mole cricket insects, mole cricket cutworm class, potato cutworm and agrotis and wireworm are to root
Injury, the referred to as bodyguard of root system of plant.
Charcoal has permanent mechanism, once applies, and can play a positive role for many years.Generally, for barren soil
Earth, plant is extremely low to the utilization rate of fertilizer in soil, and after adding charcoal, charcoal can be effectively various in Enriching soil
Effective element, then resupplies plant, improves the utilization rate of limited fertilizer in soil, compared with not applying charcoal, is conducive to
Plant growing.
Content of the invention
It is an object of the present invention to provide a kind of insect protected charcoal corruption slow-release carbamide.
The technical scheme is that slow-release carbamide by mass fraction be the slow release coating agent of 1-5.5 part, 94.5-99 part
Carbamide forms.
The raw material of coating agent and proportioning (mass percent)：
Activation humic acid 10-25%
Charcoal 5-20%
Glucomannoglycan 5-15%
Dextrin 5-15%
Glycerol 10-40%
Remaining is water；
Wherein, glucomannoglycan and dextrin total amount not can exceed that 25%, and glycerol and water inventory are less than 60%.
Charcoal be bio-organic materials (biomass) in anoxia or anoxybiotic environment, after high temperature pyrolysis generate consolidates
State product；Typically under 500 DEG C to 600 DEG C of high temperature, organic substance is placed under anaerobic condition, height is controlledly carried out to it
Temperature is decomposed；Ground, obtain 60-100 mesh granule.Wherein, organic material can be gathered materials on the spot, reduces cost, and the such as north can
So that using straw etc., south can use bamboo, and bamboo charcoal has antibacterial functions, and effect is more preferable.
Glucomannoglycan (KGM), belongs to solubility hemicellulose, have water-soluble, water holding thickening, stable, suspend, gelling, viscous
Connect, multiple unique physicochemical properties such as film forming.
Dextrin：Generally starchy material is carried out steaming and decocting under high temperature, high pressure in production, so that starch molecule is decomposed, starch
Liquid pasty state is changed into from graininess.
Glycerol and water are as solvent：Glycerol, national standard is referred to as glycerol, can absorb moisture from the air.
Preferably, the raw material of coating agent and proportioning (mass percent)：
Activation humic acid 15-25%
Charcoal 10-20%
Glucomannoglycan 5-10%
Dextrin 5-10%
Glycerol 10-20%
Remaining is water；
Wherein, glucomannoglycan and dextrin total amount not can exceed that 15%, and glycerol and water inventory are less than 55%.
Preferably, the raw material of coating agent and proportioning (mass percent)：
Activation humic acid 20%
Charcoal 15%
Glucomannoglycan 5%
Dextrin 5%
Glycerol 20%
Remaining is water.
The preparation method of coating agent：
(1) by weight ratio glycerol is added to the water, mix homogeneously；Again glucomannoglycan, dextrin are added in solution, stir
Mix, be heated to 60-85 DEG C；
(2) in the solution of mix homogeneously, it is separately added into humic acid, charcoal by weight ratio, stir 0.5-2h.
Wherein, the activation of humic acid can be using patented technology 104892309A or 105819952A it is also possible to directly adopt
Purchase the humic acid activating, the humic acid effect after activation is more preferable.
Preferably, the preparation method of coating agent：
(1) by weight ratio glycerol is added to the water, mix homogeneously；Again glucomannoglycan, dextrin are added in solution, stir
Mix, be heated to 80 DEG C；
(2) in the solution of mix homogeneously, it is separately added into humic acid, charcoal by weight ratio, stir 1h.
The preparation method of insect protected charcoal corruption slow-release carbamide：
1-5.5% according to weight of urea weighs coating agent, mixes with urea granules, dries.Wherein, coating agent and carbamide
Hybrid mode, it is possible to use：
By coating agent spray to carbamide can more than, formed urea granules surface wrap up coating agent slow-release carbamide granule；
Or urea granules are mixed with peplos agent solution, stirring, form the slow release that coating agent is wrapped up on urea granules surface
Urea granules.
Preferably, the preparation method of insect protected charcoal corruption slow-release carbamide：
2-2.5% according to weight of urea weighs coating agent, mixes with urea granules, dries.Wherein, coating agent and carbamide
Hybrid mode, it is possible to use：
By coating agent spray to carbamide can more than, formed urea granules surface wrap up coating agent slow-release carbamide granule；
Or urea granules are mixed with peplos agent solution, stirring, form the slow release that coating agent is wrapped up on urea granules surface
Urea granules.
Preferably, the preparation method of insect protected charcoal corruption slow-release carbamide：
According to 2.5% weighing coating agent of weight of urea, mix with urea granules, coating agent is sprayed to carbamide permissible
On, form the slow-release carbamide granule that coating agent is wrapped up on urea granules surface, dry.
The beneficial effects of the present invention is：
1st, pass through coating agent, play the effect of slow-release carbamide nutrient, extend the carbamide nutrients release cycle, reduce fertilizing operation
Operation.
2nd, using humic acid in coating agent, make use of humic acid to suppress the effect to ureaclastic activity for the urase, keep
Ammonia stability, makes nutrient progressively discharge.
3rd, humic acidss can also make the calcium phosphorus in calacareous soil become available P, on the one hand improves ferrum, calcium ion
Biological activity, on the other hand improves the fertilizer efficiency of phosphate fertilizer.The physical properties such as soil aeration, water resistance and tilth can also be improved
Matter, improves soil water-reataining fertilizer-keeping ability, deepens soil color, strengthens heat absorption capacity, improves the functions such as the soil moisture.
4th, charcoal can play and improve soil capacity, keep the effect of liquid manure balance, have the effect of anthelmintic simultaneously.
Specific embodiment
A kind of insect protected charcoal corruption slow-release carbamide it is characterised in that：Described slow-release carbamide by mass fraction for 1-5.5 part slow release
Coating agent, the carbamide composition of 94.5-99 part.
Described slow release coating agent raw material and proportioning (mass percent)：
Activation humic acid 10-25%
Charcoal 5-20%
Glucomannoglycan 5-15%
Dextrin 5-15%
Glycerol 10-40%
Remaining is water；
Wherein, glucomannoglycan and dextrin total amount not can exceed that 25%, and glycerol and water are total
Amount is less than 60%.
Described slow release coating agent raw material and proportioning (mass percent)：
Activation humic acid 15-25%
Charcoal 10-20%
Glucomannoglycan 5-10%
Dextrin 5-10%
Glycerol 10-20%
Remaining is water；
Wherein, glucomannoglycan and dextrin total amount not can exceed that 15%, and glycerol and water are total
Amount is less than 55%.
Described slow release coating agent raw material and proportioning (mass percent)：
Activation humic acid 20%
Charcoal 15%
Glucomannoglycan 5%
Dextrin 5%
Glycerol 20%
Remaining is water.
Described slow release coating agent preparation method：
(1) by weight ratio glycerol is added to the water, mix homogeneously；Again glucomannoglycan, dextrin are added in solution, stir
Mix, be heated to 60-85 DEG C；
(2) in the solution of mix homogeneously, it is separately added into humic acid, charcoal by weight ratio, stir 0.5-2h.
Described slow release coating agent preparation method：
(1) by weight ratio glycerol is added to the water, mix homogeneously；Again glucomannoglycan, dextrin are added in solution, stir
Mix, be heated to 80 DEG C；
(2) in the solution of mix homogeneously, it is separately added into humic acid, charcoal by weight ratio, stir 1h.
1-5.5% according to weight of urea weighs described slow release coating agent, mixes with urea granules, dries；Wherein, peplos
Agent and the hybrid mode of carbamide, it is possible to use：
By coating agent spray to carbamide can more than, formed urea granules surface wrap up coating agent slow-release carbamide granule；
Or urea granules are mixed with peplos agent solution, stirring, form the slow release that coating agent is wrapped up on urea granules surface
Urea granules.
2-2.5% according to weight of urea weighs coating agent, mixes with urea granules, dries.Wherein, coating agent and carbamide
Hybrid mode, it is possible to use：
By coating agent spray to carbamide can more than, formed urea granules surface wrap up coating agent slow-release carbamide granule；
Or urea granules are mixed with peplos agent solution, stirring, form the slow release that coating agent is wrapped up on urea granules surface
Urea granules.
According to 2.5% weighing coating agent of weight of urea, mix with urea granules, coating agent is sprayed to carbamide permissible
On, form the slow-release carbamide granule that coating agent is wrapped up on urea granules surface, dry.
Embodiment 1：
Add the water of 4kg and the glycerol of 1kg in stirring container, stir, add 1kg glucomannoglycan and
The dextrin of 1kg, stirring, it is heated to 85 DEG C, after temperature stabilization, sequentially add the humic acid after 1kg activation and 2kg charcoal.Molten
Liquid stirs 0.5h.
In this proportioning, moisture is higher, and therefore heating-up temperature is higher, and mixing time is longer.Weigh the solution of 1kg, spray exists
On the 20kg carbamide in fluid bed, it is thoroughly mixed, 85 DEG C of drying after 0.5h, i.e. patented product insect protected charcoal corruption slow release
Carbamide.
This product is applied to crop or the growing environment that requirement nitrogen discharges as early as possible.Through test, the Nitrogen releasing cycle is 3
Month.
Embodiment 2：
Add the water of 3.5kg and the glycerol of 1kg in stirring container, stir, the Portugal adding 1.5kg is sweet poly-
Sugar and the dextrin of 1.0kg, stirring, it is heated to 60 DEG C, after temperature stabilization, sequentially add the humic acid after 2.5kg activation and 0.5kg
Charcoal.Solution stirring 2h.
Weigh the solution of 1kg, spray, on the 100kg carbamide in fluid bed, is thoroughly mixed, 60 DEG C of bakings after 1h
Dry, i.e. patented product insect protected charcoal corruption slow-release carbamide.
This product is applied to and has high demands nitrogen Bulk Blending Fertilizer, the nitrogenous fertilizer of such as 40-0-0, and it is 5 months that nutrient adds up deenergized period.
Embodiment 3：
Add the water of 2kg and the glycerol of 3.5kg in stirring container, stir, the Portugal adding 0.5kg is sweet poly-
Sugar and the dextrin of 1kg, stirring, it is heated to 85 DEG C, after temperature stabilization, sequentially add the humic acid after 1.5kg activation and 1.5kg life
Thing charcoal.Solution stirring 1h.
Weigh the solution of 1kg, mix with the 40kg carbamide in fluid bed, be sufficiently stirred for, 60 DEG C of drying after 1h, that is, obtain specially
Sharp product insect protected charcoal corruption slow-release carbamide.
Embodiment 4：
Add the water of 2kg and the glycerol of 3.5kg in stirring container, stir, the Portugal adding 0.5kg is sweet poly-
Sugar and the dextrin of 0.5kg, stirring, it is heated to 80 DEG C, after temperature stabilization, sequentially add the humic acid after 2kg activation and 1.5kg life
Thing charcoal.Solution stirring 1h.
Wherein, humic acid adopts the activation method of ammonification；Charcoal adopts the straw of 500 DEG C of calcinings, crosses 100 mesh after grinding
Sieve.
In this proportioning, moisture is less, therefore, weighs the solution of 1kg, and spray, on the 40kg carbamide in fluid bed, fills
Divide stirring mixing, 60 DEG C of drying after 1h, i.e. patented product insect protected charcoal corruption slow-release carbamide.
Improved with the plant recovery of nutrient of charcoal and the coated urea of humic acid spouse coated urea more single than humic acid again
40%, meanwhile, also add the effect of insect protected.
Above one embodiment of the present of invention is described in detail, but described content has been only the preferable enforcement of the present invention
Example is it is impossible to be considered the practical range for limiting the present invention.All impartial changes made according to the present patent application scope and improvement
Deng all should still belong within the patent covering scope of the present invention.
Claims (9)
1. a kind of insect protected charcoal corruption slow-release carbamide it is characterised in that：Described slow-release carbamide by mass fraction for 1-5.5 part slow release bag
Membrane, the carbamide composition of 94.5-99 part.
2. according to claim 1 insect protected charcoal corruption slow-release carbamide it is characterised in that：Described slow release coating agent raw material and proportioning
(mass percent)：
Activation humic acid 10-25%
Charcoal 5-20%
Glucomannoglycan 5-15%
Dextrin 5-15%
Glycerol 10-40%
Remaining is water；
Wherein, glucomannoglycan and dextrin total amount not can exceed that 25%, and glycerol and water are total
Amount is less than 60%.
3. according to claim 2 insect protected charcoal corruption slow-release carbamide it is characterised in that：Described slow release coating agent raw material and proportioning
(mass percent)：
Activation humic acid 15-25%
Charcoal 10-20%
Glucomannoglycan 5-10%
Dextrin 5-10%
Glycerol 10-20%
Remaining is water；
Wherein, glucomannoglycan and dextrin total amount not can exceed that 15%, and glycerol and water are total
Amount is less than 55%.
4. according to claim 2 insect protected charcoal corruption slow-release carbamide it is characterised in that：Described slow release coating agent raw material and proportioning
(mass percent)：
Activation humic acid 20%
Charcoal 15%
Glucomannoglycan 5%
Dextrin 5%
Glycerol 20%
Remaining is water.
5. according to claim 1-4 arbitrary described insect protected charcoal corruption slow-release carbamide it is characterised in that：Described slow release coating agent preparation side
Method：
(1) by weight ratio glycerol is added to the water, mix homogeneously；Again glucomannoglycan, dextrin are added in solution, stirring,
It is heated to 60-85 DEG C；
(2) in the solution of mix homogeneously, it is separately added into humic acid, charcoal by weight ratio, stir 0.5-2h.
6. according to claim 5 insect protected charcoal corruption slow-release carbamide it is characterised in that：Described slow release coating agent preparation method：
(1) by weight ratio glycerol is added to the water, mix homogeneously；Again glucomannoglycan, dextrin are added in solution, stirring,
It is heated to 80 DEG C；
(2) in the solution of mix homogeneously, it is separately added into humic acid, charcoal by weight ratio, stir 1h.
7. according to claim 1 insect protected charcoal corruption slow-release carbamide preparation method it is characterised in that：
1-5.5% according to weight of urea weighs described slow release coating agent, mixes with urea granules, dries；Wherein, coating agent with
The hybrid mode of carbamide, it is possible to use：
By coating agent spray to carbamide can more than, formed urea granules surface wrap up coating agent slow-release carbamide granule；
Or urea granules are mixed with peplos agent solution, stirring, form the slow-release carbamide that coating agent is wrapped up on urea granules surface
Granule.
8. according to claim 7 insect protected charcoal corruption slow-release carbamide preparation method it is characterised in that：
2-2.5% according to weight of urea weighs coating agent, mixes with urea granules, dries.Wherein, coating agent and carbamide is mixed
Conjunction mode, it is possible to use：
By coating agent spray to carbamide can more than, formed urea granules surface wrap up coating agent slow-release carbamide granule；
Or urea granules are mixed with peplos agent solution, stirring, form the slow-release carbamide that coating agent is wrapped up on urea granules surface
Granule.
9. according to claim 7 insect protected charcoal corruption slow-release carbamide preparation method it is characterised in that：
According to weight of urea 2.5% weighing coating agent, mix with urea granules, by coating agent spray to carbamide can more than, shape
Become urea granules surface to wrap up the slow-release carbamide granule of coating agent, dry.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10011536B1 (en) | 2017-09-20 | 2018-07-03 | King Saud University | Encapsulated sustained release urea fertilizer |
| CN109651014A (en) * | 2018-12-14 | 2019-04-19 | 深圳市芭田生态工程股份有限公司 | A kind of multiple function stable type coated fertilizer and preparation method thereof |
| GB2613009A (en) * | 2021-11-19 | 2023-05-24 | Yara Uk Ltd | Agricultural composition |
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| CN1376652A (en) * | 2001-03-28 | 2002-10-30 | 中国科学院山西煤炭化学研究所 | Wrapped urea humate and its preparing process |
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