CN106396886B - Slow release fertilizer and preparation method thereof - Google Patents
Slow release fertilizer and preparation method thereof Download PDFInfo
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- CN106396886B CN106396886B CN201610755803.7A CN201610755803A CN106396886B CN 106396886 B CN106396886 B CN 106396886B CN 201610755803 A CN201610755803 A CN 201610755803A CN 106396886 B CN106396886 B CN 106396886B
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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
- C05G3/20—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for preventing the fertilisers being reduced to powder; Anti-dusting additives
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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
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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Abstract
The invention relates to the technical field of slow release fertilizers, in particular to a slow release fertilizer and a preparation method thereof.A release agent is added into an inner core, and after the coating treatment of a coating liquid, the release agent is added for treatment, so that the obtained slow release fertilizer can effectively avoid the caking phenomenon, and the release agent can avoid the adhesion among fertilizer components in the inner core, an outer coating layer can wrap an inner core layer, and meanwhile, the contact adhesion among coating layer materials can be avoided, the quality of the slow release fertilizer is improved, and the uniform nutrient of the slow release fertilizer is ensured; moreover, the konjac gum aqueous solution and the guanidine gum aqueous solution are adopted as coating layer materials in the slow-release fertilizer, so that the slow-release period of the slow-release fertilizer is better, compared with the case that the konjac gum aqueous solution and the guanidine gum aqueous solution are independently adopted as coating layer materials for coating the fertilizer, the slow-release period can better meet the nutrient requirements of crops in medium and short periods, and the nutrients are slowly released within 30-80 days, wherein the nutrient accounts for 90%.
Description
Technical Field
The invention relates to the technical field of slow release fertilizers, in particular to a slow release fertilizer and a preparation method thereof.
Background
With the continuous development of agricultural production technology, and the requirement of people to environmental quality is higher and higher, and along with traditional farming brings the current situation of pollution for the environment more and more prominent, make the quality requirement to farming uses fertile also higher and higher, make agricultural use fertile not only can provide nutrition for the crop, but also require agricultural use fertile can improve soil, make soil structure layer loose, the nutrient obtains make full use of, reduces the soil rate of hardening, reduces the fertilization cost.
Based on the advantages, the slow release fertilizer is developed and researched by researchers in the modern agriculture field in a large amount due to the advantages of the slow release fertilizer, so that the quality of the fertilizer for agricultural planting is improved, and the slow release fertilizer is developed rapidly; in the prior art, the slow release fertilizers have more varieties, including slow release fertilizers which are directly made for certain crops, slow release fertilizers which are directly used for certain areas and slow release fertilizers which are used for certain diseases, so that the functionality and pertinence of the slow release fertilizers are enhanced, and meanwhile, the slow release period of the slow release fertilizers is also considered, so that the nutrition slow release of the slow release fertilizers can meet the growth requirements of the crops; if people singly adopt the konjac gum solution as a coating material to coat the fertilizer, the slow release period of the obtained slow release fertilizer is longer, and the coating material can be utilized by crops; a guanidine gum aqueous solution is independently adopted as a coating material to coat the fertilizer, so that the slow release period of the obtained slow release fertilizer is better, and the coating layer can be degraded and utilized along with the slow release of nutrients of the slow release fertilizer; in addition, the prior art also has a great deal of technical schemes for considering the degradation and utilization of the envelope and improving the soil structure layer.
However, in the process of preparing the slow release fertilizer, most raw materials adopt chemical fertilizers, and the chemical fertilizers are quickly agglomerated after being prepared and granulated, so that the quality of granules is changed, the difficulty in the process of preparing products is high, the cost is high, the slow release quality of the obtained slow release fertilizer is poor, and the nutrients in the slow release fertilizer are not uniform; in addition, after the slow release fertilizer is wrapped into particles, the outer coating layers are easy to agglomerate and conglobate, so that the fertilizing difficulty is higher in the fertilizing process, the storage period of the slow release fertilizer is shorter, and the quality is poorer.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a slow release fertilizer and a preparation method thereof.
The method is realized by the following technical scheme:
a slow release fertilizer comprises an inner core and an outer coating, wherein the inner core comprises a fertilizer and an anti-sticking agent, and the anti-sticking agent accounts for 1-3% of the mass of the fertilizer; the outer envelope is composed of a konjak glue solution, a guanidine gum aqueous solution and an anti-sticking agent, wherein the mass ratio of the konjak glue solution to the guanidine gum aqueous solution is 3-5:1.1-2.5, and the anti-sticking agent accounts for 0.1-0.4% of the mass of the outer envelope; the outer coating film accounts for 3-7% of the mass of the inner core.
The mass concentration of the konjac glucomannan solution is 0.1-7%; the mass concentration of the guanidine gum aqueous solution is 0.5-1.7%.
The anti-sticking agent comprises the raw material components of 2-2.5g of shells, 0.1-0.7g of fly ash, 0.3-1.1g of potassium alginate, 1-3g of glycerol, 2-7g of hydroxymethyl cellulose, 1-3g of urea, 0.2-1.3g of humus, 1-3g of starch and 0.3-1.5g of chitosan.
The anti-sticking agent comprises the raw materials of 2.3g of shells, 0.5g of fly ash, 0.7g of potassium alginate, 2g of glycerol, 5g of hydroxymethyl cellulose, 2g of urea, 0.8g of humus, 1-3g of starch and 0.3-1.5g of chitosan.
The preparation method of the anti-sticking agent comprises the steps of drying shells in the sun, crushing the shells into powder, adding the fly ash and the humus soil, and uniformly stirring to obtain mixed powder; mixing potassium alginate, glycerol, hydroxymethyl cellulose and urea uniformly, treating at 80-90 deg.C for 10-20min, adding the mixed powder, adding water 15-37 wt% of the mixed powder, stirring uniformly, adding starch and chitosan, fermenting at 38-58 deg.C for 4-8 days, adding water to obtain slurry with solid-to-liquid ratio of 5:3, and spray drying.
The preparation method of the slow release fertilizer comprises the following steps:
(1) placing the fertilizer in a granulator for granulation, controlling the water content of the fertilizer to be 20-40% and the particle fineness of the fertilizer to be 20-40 meshes, adding an anti-sticking agent accounting for the fertilizer, stirring and mixing uniformly, and sieving by a 19-mesh sieve to obtain granular fertilizer;
(2) placing the granular fertilizer in a coating machine, spraying konjac gum water solution on the surface of the granular fertilizer, drying until the water content is 10-18%, spraying and coating with guanidine gum water solution until the water content is 4-7%, soaking in warm water for 10-20s, adding an anti-sticking agent, coating on the surface of the granules, and drying until the water content is 4-7%.
The temperature of the warm water is 37-45 ℃.
The warm water is boron solution with mass concentration of 0.1-3%.
The boron element in the boron solution is provided by one of boric acid and borax.
Compared with the prior art, the invention has the technical effects that:
the anti-sticking agent is added into the inner core, and after the coating liquid is coated, the anti-sticking agent is added for treatment, so that the obtained slow release fertilizer can effectively avoid the phenomenon of agglomeration and caking, the anti-sticking agent can avoid the adhesion among fertilizer components in the inner core, the outer coating layer can wrap the inner core layer, and meanwhile, the mutual contact adhesion of coating layer materials can be avoided, the quality of the slow release fertilizer is improved, and the uniform nutrient of the slow release fertilizer is ensured; moreover, the konjac gum aqueous solution and the guanidine gum aqueous solution are adopted as coating layer materials in the slow-release fertilizer, so that the slow-release period of the slow-release fertilizer is better, compared with the case that the konjac gum aqueous solution and the guanidine gum aqueous solution are independently adopted as coating layer materials for coating the fertilizer, the slow-release period can better meet the nutrient requirements of crops in medium and short periods, and the nutrients are slowly released within 30-80 days, wherein the nutrient accounts for 90%.
The anti-sticking agent not only can effectively avoid the anti-sticking problem of the slow release fertilizer, but also can supplement nutrients for the slow release fertilizer, and nutrient components in the anti-sticking agent can be utilized by crops along with the slow release process of the nutrients of the slow release fertilizer, so that the fertilizer efficiency of the slow release fertilizer is improved.
According to the invention, after coating, the coating is soaked in warm water, so that the coating structures of the konjac gum water solution layer and the guanidine gum water solution layer are interacted, the structure of the slow-release fertilizer coating layer is solid, and scraping damage is avoided; and the internal nutrients can be pre-slowly released, so that the slow release pores on the coating layer are improved, the slow release effect of the slow release fertilizer is improved, and the quality of the slow release fertilizer is improved.
In addition, the boron element is added into the warm water, so that the interaction between the konjac gum water solution layer and the guanidine gum water solution layer can be promoted, the bonding strength of the two coating materials is enhanced, the nutrients can be supplemented for the slow release fertilizer, and the quality of the slow release fertilizer is improved.
Detailed Description
The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.
In the following embodiment, the outer envelope accounts for 3-7% of the mass of the inner core; the fertilizer in the invention can be one or a mixture of more of traditional farmyard manure, such as chicken manure, cow manure, sheep manure, pig manure and the like; and may also be a conventional fertilizer such as a mixture of one or more of urea, potassium dihydrogen phosphate, potassium hydrogen phosphate, potassium sulfate, ammonium nitrate, and the like; or a mixture of chemical fertilizer and farmyard manure; or a large amount of compound fertilizers in the prior art, such as prepared by taking straws, traditional Chinese medicine components, mineral powder, humus soil and the like as raw materials.
Example 1
A slow release fertilizer comprises an inner core and an outer coating, wherein the inner core comprises a fertilizer and an anti-sticking agent, and the anti-sticking agent accounts for 1% of the mass of the fertilizer; the outer coating is composed of a konjac gum aqueous solution, a guanidine gum aqueous solution and an anti-sticking agent, wherein the mass ratio of the konjac gum aqueous solution to the guanidine gum aqueous solution is 3:1.1, and the anti-sticking agent accounts for 0.1% of the mass of the outer coating.
The mass concentration of the konjac glucomannan solution is 0.1%; the mass concentration of the guanidine gum aqueous solution is 0.5%.
The anti-sticking agent comprises the raw materials of 2g of shells, 0.1g of fly ash, 0.3g of potassium alginate, 1g of glycerol, 2g of hydroxymethyl cellulose, 1g of urea, 0.2g of humus, 1g of starch and 0.3g of chitosan.
The preparation method of the anti-sticking agent comprises the steps of drying shells in the sun, crushing the shells into powder, adding the fly ash and the humus soil, and uniformly stirring to obtain mixed powder; mixing potassium alginate, glycerol, hydroxymethyl cellulose and urea uniformly, treating at 80 deg.C for 10min, adding the mixed powder, adding water 15% of the mixed powder, stirring uniformly, adding starch and chitosan, fermenting at 38 deg.C for 4 days, adding water to obtain slurry with solid-to-liquid ratio of 5:3, and spray drying.
The preparation method of the slow release fertilizer comprises the following steps:
(1) placing the fertilizer in a granulator for granulation, controlling the water content of the fertilizer to be 20% and the particle fineness of the fertilizer to be 20 meshes, adding an anti-sticking agent accounting for the fertilizer, stirring and mixing uniformly, and sieving by a 19-mesh sieve to obtain granular fertilizer;
(2) placing the granular fertilizer in a coating machine, spraying konjac gum water solution on the surface of the granular fertilizer, drying until the water content is 10%, spraying guar gum water solution for coating, drying until the water content is 4%, soaking in warm water for 10s, adding an anti-sticking agent, coating on the surface of the granules, and drying until the water content is 4%.
The temperature of the warm water is 37 ℃.
Example 2
A slow release fertilizer comprises an inner core and an outer coating, wherein the inner core comprises a fertilizer and an anti-sticking agent, and the anti-sticking agent accounts for 3% of the mass of the fertilizer; the outer coating is composed of a konjac gum aqueous solution, a guanidine gum aqueous solution and an anti-sticking agent, wherein the mass ratio of the konjac gum aqueous solution to the guanidine gum aqueous solution is 5:2.5, and the anti-sticking agent accounts for 0.4% of the mass of the outer coating.
The mass concentration of the konjac glucomannan solution is 7%; the mass concentration of the guanidine gum aqueous solution is 1.7%.
The anti-sticking agent comprises 2.5g of shells, 0.7g of fly ash, 1.1g of potassium alginate, 3g of glycerol, 7g of hydroxymethyl cellulose, 3g of urea, 1.3g of humus, 3g of starch and 1.5g of chitosan.
The preparation method of the anti-sticking agent comprises the steps of drying shells in the sun, crushing the shells into powder, adding the fly ash and the humus soil, and uniformly stirring to obtain mixed powder; mixing potassium alginate, glycerol, hydroxymethyl cellulose and urea uniformly, treating at 90 deg.C for 20min, adding the mixed powder, adding water 37 wt% of the mixed powder, stirring uniformly, adding starch and chitosan, fermenting at 58 deg.C for 8 days, adding water to make into slurry with solid-to-liquid ratio of 5:3, and spray drying.
The preparation method of the slow release fertilizer comprises the following steps:
(1) placing the fertilizer in a granulator for granulation, controlling the water content of the fertilizer to be 40% and the particle fineness of the fertilizer to be 40 meshes, adding an anti-sticking agent accounting for the fertilizer, stirring and mixing uniformly, and sieving by a 19-mesh sieve to obtain granular fertilizer;
(2) placing the granular fertilizer in a coating machine, spraying konjac gum water solution on the surface of the granular fertilizer, drying until the water content is 18%, spraying and coating with guanidine gum water solution, drying until the water content is 7%, soaking in warm water for 20s, adding an anti-sticking agent, coating on the surface of the granules, and drying until the water content is 7%.
The temperature of the warm water is 45 ℃.
The warm water is a boron solution with the mass concentration of 3%.
The boron element in the boron solution is provided by boric acid.
Example 3
A slow release fertilizer comprises an inner core and an outer coating, wherein the inner core comprises a fertilizer and an anti-sticking agent, and the anti-sticking agent accounts for 2% of the mass of the fertilizer; the outer coating is composed of a konjac gum aqueous solution, a guanidine gum aqueous solution and an anti-sticking agent, wherein the mass ratio of the konjac gum aqueous solution to the guanidine gum aqueous solution is 4:1.7, and the anti-sticking agent accounts for 0.3% of the mass of the outer coating.
The mass concentration of the konjac glucomannan solution is 3%; the mass concentration of the guanidine gum aqueous solution is 0.9%.
The anti-sticking agent comprises the raw materials of 2.3g of shells, 0.5g of fly ash, 0.7g of potassium alginate, 2g of glycerol, 5g of hydroxymethyl cellulose, 2g of urea, 0.8g of humus, 1-3g of starch and 0.3-1.5g of chitosan.
The preparation method of the anti-sticking agent comprises the steps of drying shells in the sun, crushing the shells into powder, adding the fly ash and the humus soil, and uniformly stirring to obtain mixed powder; mixing potassium alginate, glycerol, hydroxymethyl cellulose and urea uniformly, treating at 85 deg.C for 15min, adding the mixed powder, adding water 27% of the mixed powder, stirring uniformly, adding starch and chitosan, fermenting at 48 deg.C for 6 days, adding water to make into slurry with solid-to-liquid ratio of 5:3, and spray drying.
The preparation method of the slow release fertilizer comprises the following steps:
(1) granulating the fertilizer in a granulator, controlling the water content of the fertilizer to be 30% and the particle fineness of the fertilizer to be 30 meshes, adding an anti-sticking agent accounting for the fertilizer, stirring and mixing uniformly, and sieving by a 19-mesh sieve to obtain granular fertilizer;
(2) placing the granular fertilizer in a coating machine, spraying konjac gum water solution on the surface of the granular fertilizer, drying until the water content is 15%, spraying and coating with guanidine gum water solution, drying until the water content is 5%, soaking in warm water for 15s, adding an anti-sticking agent, coating on the surface of the granules, and drying until the water content is 6%.
The temperature of the warm water is 43 ℃.
The warm water is a boron solution with the mass concentration of 2%.
The boron element in the boron solution is provided by borax.
Example 4
A slow release fertilizer comprises an inner core and an outer coating, wherein the inner core comprises a fertilizer and an anti-sticking agent, and the anti-sticking agent accounts for 1% of the mass of the fertilizer; the outer coating is composed of a konjac gum aqueous solution, a guanidine gum aqueous solution and an anti-sticking agent, wherein the mass ratio of the konjac gum aqueous solution to the guanidine gum aqueous solution is 5:1.1, and the anti-sticking agent accounts for 0.4% of the mass of the outer coating.
The mass concentration of the konjac glucomannan solution is 0.1%; the mass concentration of the guanidine gum aqueous solution is 1.7%.
The anti-sticking agent comprises 2g of shells, 0.7g of fly ash, 0.3g of potassium alginate, 3g of glycerol, 2g of hydroxymethyl cellulose, 3g of urea, 0.2g of humus, 1g of starch and 1.5g of chitosan.
The preparation method of the anti-sticking agent comprises the steps of drying shells in the sun, crushing the shells into powder, adding the fly ash and the humus soil, and uniformly stirring to obtain mixed powder; mixing potassium alginate, glycerol, hydroxymethyl cellulose and urea uniformly, treating at 90 deg.C for 10min, adding the mixed powder, adding water 37 wt% of the mixed powder, stirring uniformly, adding starch and chitosan, fermenting at 38 deg.C for 8 days, adding water to make into slurry with solid-to-liquid ratio of 5:3, and spray drying.
The preparation method of the slow release fertilizer comprises the following steps:
(1) placing the fertilizer in a granulator for granulation, controlling the water content of the fertilizer to be 40% and the particle fineness of the fertilizer to be 20 meshes, adding an anti-sticking agent accounting for the fertilizer, stirring and mixing uniformly, and sieving by a 19-mesh sieve to obtain granular fertilizer;
(2) placing the granular fertilizer in a coating machine, spraying konjac gum water solution on the surface of the granular fertilizer, drying until the water content is 18%, spraying guar gum water solution for coating, drying until the water content is 7%, soaking in warm water for 10s, adding an anti-sticking agent, coating on the surface of the granules, and drying until the water content is 7%.
The temperature of the warm water is 45 ℃.
The warm water is a boron solution with the mass concentration of 0.1%.
The boron element in the boron solution is provided by boric acid.
Example 5
A slow release fertilizer comprises an inner core and an outer coating, wherein the inner core comprises a fertilizer and an anti-sticking agent, and the anti-sticking agent accounts for 3% of the mass of the fertilizer; the outer coating is composed of a konjac gum aqueous solution, a guanidine gum aqueous solution and an anti-sticking agent, wherein the mass ratio of the konjac gum aqueous solution to the guanidine gum aqueous solution is 3:2.5, and the anti-sticking agent accounts for 0.2% of the mass of the outer coating.
The mass concentration of the konjac glucomannan solution is 2%; the mass concentration of the guanidine gum aqueous solution is 0.5%.
The anti-sticking agent comprises the raw materials of 2.5g of shells, 0.7g of fly ash, 1.1g of potassium alginate, 2g of glycerol, 6g of hydroxymethyl cellulose, 2g of urea, 0.2g of humus, 3g of starch and 1.5g of chitosan.
The preparation method of the anti-sticking agent comprises the steps of drying shells in the sun, crushing the shells into powder, adding the fly ash and the humus soil, and uniformly stirring to obtain mixed powder; mixing potassium alginate, glycerol, hydroxymethyl cellulose and urea uniformly, treating at 80 deg.C for 10min, adding the mixed powder, adding water 37% of the mixed powder, stirring uniformly, adding starch and chitosan, fermenting at 38 deg.C for 8 days, adding water to obtain slurry with solid-to-liquid ratio of 5:3, and spray drying.
The preparation method of the slow release fertilizer comprises the following steps:
(1) placing the fertilizer in a granulator for granulation, controlling the water content of the fertilizer to be 40% and the particle fineness of the fertilizer to be 20 meshes, adding an anti-sticking agent accounting for the fertilizer, stirring and mixing uniformly, and sieving by a 19-mesh sieve to obtain granular fertilizer;
(2) placing the granular fertilizer in a coating machine, spraying konjac gum water solution on the surface of the granular fertilizer, drying until the water content is 18%, spraying and coating with guanidine gum water solution, drying until the water content is 4%, soaking in warm water for 20s, adding an anti-sticking agent, coating on the surface of the granules, and drying until the water content is 4%.
The temperature of the warm water is 45 ℃. The warm water is a boron solution with the mass concentration of 1.1%. The boron element in the boron solution is provided by boric acid.
Claims (6)
1. The slow release fertilizer is characterized by comprising an inner core and an outer coating, wherein the inner core comprises a fertilizer and an anti-sticking agent, and the anti-sticking agent accounts for 1-3% of the mass of the fertilizer; the outer envelope is composed of a konjac gum aqueous solution, a guanidine gum aqueous solution and an anti-sticking agent, wherein the mass ratio of the konjac gum aqueous solution to the guanidine gum aqueous solution is 3-5:1.1-2.5, and the anti-sticking agent accounts for 0.1-0.4% of the mass of the outer envelope; the outer coating film accounts for 3-7% of the mass of the inner core;
the preparation method of the slow release fertilizer comprises the following steps:
(1) placing the fertilizer in a granulator for granulation, controlling the water content of the fertilizer to be 20-40% and the particle fineness of the fertilizer to be 20-40 meshes, adding an anti-sticking agent, stirring and mixing uniformly, and sieving by a 19-mesh sieve to obtain granular fertilizer;
(2) placing the granular fertilizer in a coating machine, spraying konjac gum water solution on the surface of the granular fertilizer, drying until the water content is 10-18%, spraying and coating with guanidine gum water solution until the water content is 4-7%, soaking in warm water for 10-20s, adding an anti-sticking agent, coating on the surface of the granules, and drying until the water content is 4-7%;
the anti-sticking agent comprises the raw material components of 2-2.5g of shells, 0.1-0.7g of fly ash, 0.3-1.1g of potassium alginate, 1-3g of glycerol, 2-7g of hydroxymethyl cellulose, 1-3g of urea, 0.2-1.3g of humus, 1-3g of starch and 0.3-1.5g of chitosan;
the preparation method of the anti-sticking agent comprises the steps of drying shells in the sun, crushing the shells into powder, adding the fly ash and the humus soil, and uniformly stirring to obtain mixed powder; mixing potassium alginate, glycerol, hydroxymethyl cellulose and urea uniformly, treating at 80-90 deg.C for 10-20min, adding the mixed powder, adding water 15-37 wt% of the mixed powder, stirring uniformly, adding starch and chitosan, fermenting at 38-58 deg.C for 4-8 days, adding water to obtain slurry with solid-to-liquid ratio of 5:3, and spray drying.
2. The slow release fertilizer according to claim 1, wherein the konjac gum aqueous solution has a mass concentration of 0.1 to 7%; the mass concentration of the guanidine gum aqueous solution is 0.5-1.7%.
3. The slow release fertilizer as claimed in claim 1, wherein the anti-sticking agent comprises 2.3g of shell, 0.5g of fly ash, 0.7g of potassium alginate, 2g of glycerol, 5g of hydroxymethyl cellulose, 2g of urea, 0.8g of humus, 1-3g of starch and 0.3-1.5g of chitosan.
4. The slow release fertilizer of claim 1, wherein the warm water is at a temperature of 37-45 ℃.
5. The slow release fertilizer according to claim 4, wherein the warm water is a boron solution having a mass concentration of 0.1 to 3%.
6. The slow release fertilizer of claim 5, wherein the boron element in the boron solution is provided by one of boric acid and borax.
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| CN107652041A (en) * | 2017-10-16 | 2018-02-02 | 王欣 | A kind of production method of the strong microbial manure of increasing both production and income, disease-resistant growth-promoting |
| CN108947708A (en) * | 2018-09-30 | 2018-12-07 | 史丹利化肥（平原）有限公司 | Fertilizer special for peanuts and preparation method thereof |
| CN110272316B (en) * | 2019-07-22 | 2021-11-30 | 陕西科技大学 | Paper-based trace element aggregation type slow release fertilizer and preparation method thereof |
| CN111533625A (en) * | 2020-06-10 | 2020-08-14 | 黑龙江实力农业肥料科技有限公司 | Preparation method for wrapping and drying granular fertilizer |
| GB2613009A (en) * | 2021-11-19 | 2023-05-24 | Yara Uk Ltd | Agricultural composition |
| CN115286465B (en) * | 2022-08-22 | 2023-10-10 | 四川络布新材料科技有限公司 | Environment-friendly special fertilizer and preparation method thereof |
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| CN106396886A (en) | 2017-02-15 |
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