CN102617227A - Slowly-released magnetized compound fertilizer and preparation method thereof - Google Patents
Slowly-released magnetized compound fertilizer and preparation method thereof Download PDFInfo
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Abstract
The invention discloses slowly-released magnetized compound fertilizer and a preparation method thereof. The method includes: crushing and well mixing all raw materials proportionally, adding fertilizer nutrition slow-release agent, using the tower type granulating process for granulating, screening the fertilizer after granulating to remove doped powder or unqualified blocks, returning the removed powder or unqualified blocks to granulating equipment to be reused to obtain screened granular fertilizer, subjecting the granular fertilizer after screening to magnetic field treatment through an adjustable permanent magnetic processing machine, drying the granular fertilizer subjected to the magnetic field treatment in a drying machine to be dewatered to meet the national standards, cooling the dried materials in a cooling machine, measuring and packaging the finished cooled materials according to specifications to obtain the slowly-released magnetized compound fertilizer. By the aid of the slowly-released magnetized compound fertilizer, yield can be increased, fertilizer utilization rate is increased, nutrient loss of the fertilizer is effectively prevented, physical and chemical characteristics of soil are improved, and biological activity of crops is improved while soil nutrient conversion is promoted.
Description
Technical field
The present invention relates to a kind of composite fertilizer, be specifically related to a kind of slowly-releasing magnetic compound fertiliser and preparation method thereof.
Background technology
China is typical agricultural big country, and grain-production occupies crucial status in agriculture prodn, and the main mode that improves per unit area yield of grain is in agriculture prodn, to use chemical fertilizer.China's fertilizer production and usage quantity all are the first in the world, but there are problems in the use of the fertilizer of China:
(1) utilization rate of fertilizer is low, and fertilizer loss causes environmental situation serious.Drop into a large amount of fertilizer application in agriculture prodn though China is annual, utilization rate of fertilizer has a long way to go compared with developed countries.Compare the utilization rate of fertilizer of developed country 55%, China's chemical fertilizer utilization ratio is on average less than 30%.Owing to apply too much chemical fertilizer or utilization rate of fertilizer is very low; Materials such as soil water soluble nutrient are poured water leaching in underground water and river by rainwater and farmland; Cause the underground water and the stream pollution of some areas; Make underground water, river, lake be eutrophication, cause that underground water is bad to be drunk, dead phenomenon often takes place in the fishes and shrimps in partial rivers, the lake.(2) singly execute or bring to fertilize partially serious problems such as agricultural land soil nutrient destruction.All the time, the fertiliser prodn in the whole world mainly concentrates on three kinds of nutrients of nitrogen, phosphorus, potassium that crop has the call, and China's fertilizer variety is more single, the secular a lot of problems of having brought of using.Use common chemical fertilizer in a large number in the farmland, its nutrient can not be absorbed by crop effectively, and some chemical substances such as nitrogen, phosphorus, potassium are prone to by soil consolidation; Form various chemical salinities; In soil, accumulate, cause the soil nutrient structural imbalance, the physical behavior variation; Part plot poisonous metal and harmful germ exceed standard, and cause soil property to worsen.Execute certain chemical fertilizer partially, then can cause the crop alimentary imbalance, the part material transforms biosynthesis block in the body, causes product quality to reduce, and it is sweetless to cause melon and fruit to taste, and vegetables are tasted not fragrant, and rot easily, can not deposit etc.(3) fertilizers is less relatively.The major cause one of China's agricultural fertilizer present situation is limit by factors such as tillage and cultivation level, crop fertilizer requirement, and crop can not obtain very high output; The 2nd, owing to too much use monistic several kinds of fertilizer, cause nutritional imbalance, the nutrient imbalance only increases cost and does not increase output, and has caused inferior agricultural-food to be difficult for selling or on the low side etc., has brought loss to the peasant.The use of functional fertilizer such as slowly-releasing, slow release fertilizer can effectively improve utilization rate of fertilizer, improve environmental pollution that common fertilizer brings etc.; Therefore how through development new type functional fertilizer or fertilizer additive control fertilizer loss; Reduce agriculture production cost; Lower environmental pollution, all conduct a research as important problem in the China and even the whole world.And the developing direction of functional fertilizer as fertilizer sources, but also be not widely used at present in China.
Simultaneously, along with rapid development of national economy, the industrial and mineral industry development is rapid, has produced a large amount of industrial and mineral solid waste, as smelts iron the output of flyash and sulfate slag, slag, blast furnace slag or the like of remaining iron selection tailings, heat power plant discharging and have several hundred million tons.Their bulk deposition is put with the village and is not only taken limited, valuable soil, also can cause and blow grey wind, the ash that rains, and serious pollution of ecological environment, to influence people healthy.The processing costs of these industrial and mineral solid waste increases day by day, and also is a difficult problem of efforts at environmental protection.
The magnetic compound fertiliser material be meant with magnetic carrier and nitrogen, phosphorus, potassium and trace element etc. through certain proportion mix, granulation; Through making the NEW TYPE OF COMPOSITE fertilizer of fertilizer maintenance certain " remanent magnetism " after the magnetic field treatment, has fertilizer and the magnetics dual-use function of (comprising soil magnetic effect and biomagnetic effect).The raw material that can make magnetic carrier is a lot, like trade waste and smart iron powder and permanent magnet materials etc. such as heat power plant's flyash, sulfate slag, iron selection tailings.Use industrial and mineral solid waste such as iron selection tailings, flyash and can produce the magnetic compound fertiliser material as magnetic carrier; Through bringing into play the double effect of its fertilizer and magnetics; Can be under identical chemical fertilizer input; Increase crop yield and utilization rate of fertilizer, soil nutrient status is improved and improve quality of agricultural product.Research shows: the soil crop system be one comprising that various ion-transfer are synthetic, the organic mineral complex system of water molecules migration, enzyme and microbial process, magnetic field is through producing soil and biomagnetism effect to the effect of metal magnetic in the electron transport in the system, dipole orientations, enzyme and the mikrobe etc.Can make the increase of soil magnetization index geometry level when soil uses the 50kg magnetic compound fertiliser,, soil water-reataining fertilizer-keeping, water supply feeder capability increased equally the release of soil nutrient.Soil is handled through certain hour in suitable externally-applied magnetic field intensity, can regulate the physicochemical character that improves soil.Under the externally-applied magnetic field influence of magnetic compound fertiliser material, agronomic crop seed germination, growth, photosynthesis and dry-matter accumulation there is good action, the drought resisting of ability enhancing crop, waterlogging property.Magnetic carrier itself in the magnetic compound fertiliser material also contains other required nutritive elements of plant in addition, is higher than the content in the soil like trace elements such as the zinc that contains in the flyash, copper, molybdenum, boron.Iron level in the iron selection tailings also will be higher than the content in the soil far away, effectively SiO
2Content between 2.56～11.7g/kg, its release rate is higher 2.0～11.0 times than soil.Through using the more output of magnetic compound fertiliser material ability crop harvesting, improve product quality and utilization rate of fertilizer, reduce cost, increase farmers' income.
At present, industrial and mining waste such as flyash, iron selection tailings etc. are produced the example of the domestic existing several successful of magnetic fertilizer as the magnetization carrier.These fertilizer mainly are conduct magnetization carriers such as employing flyash, add organic fertilizer or bacteria agent again, adopt simply " fusion method " (promptly direct dried being mixed closed) mostly, and being made has the soil improvement agent of certain fertilizer efficiency.Like Chinese patent publication number CN 102030594A disclosed " the biological magnetization of silico-calcium ferripotassium is fertile ", exactly through mixing such as silicate mineral, flyash and humic acids magnetization is realized; Publication number CN 1088565A disclosed " Mangnetized fertilizer " is to utilize flyash to be raw material, adds multielement additive, forms through powdery or the magnetization of particulate state magnetizer.Also there are some to utilize magnetization carriers to mix to carry out the granulation back magnetization and form granular magnetic compound fertiliser material with compound manure; Like publication number CN 1203215A disclosed " hexabasic magnetized fertilizer "; Be that nutritive elements such as nitrogen phosphorus potassium are the main body composition; Be equipped with the water coal ash of different components, yellow iron oxide yellow mud, kaolin and trace element, magnetize behind the mixing granulation and process the particulate state magnetized special fertilizer.Publication number CN 1113904A disclosed " producing method for granulated magnetized chemical fertilizer " is in the powdery phosphatization fertilizer, to add fused(calcium magnesium)phosphate manufacturing forms with the sulfuric acid nitrogen phosphorus slurry employing granular compound fertilizer technological process of production.Do not appear in the newspapers as yet and utilize industrial and mining waste to produce functional magnetic fertilizer as magnetic carrier.
Slow-release material is added the slow release effect that reaches its nutrient in the compound manure; Magnetize processing again; Process slowly-releasing magnetic compound fertiliser material, not only can bring into play the slow controlled-release effect of nutrient element such as its nitrogen phosphorus potassium, improve utilization rate of fertilizer; " remanent magnetism " effect in can also be the more effectively permanent performance magnetic compound fertiliser material is better improved physicochemical character and the nutrient situation etc. of soil.The meaning of slowly-releasing magnetic compound fertiliser material is on the one hand to can reduce the pollution of industrial and mineral solid waste to surrounding environment; Also improve the agricultural land soil nutrient situation on the other hand and promoted the fertilizer industry developmental level; Increases in grain production are increased income, and increasing farmers' income and promoting agricultural development has important meaning.
Summary of the invention
The objective of the invention is the inorganic material that common compound manure is required effectively combines with industrial and mining waste such as iron selection tailings and concentrated fertilizer sustained release dosage; Develop a kind of slowly-releasing magnetic compound fertiliser material particle and preparation method thereof; Realization is the production of the magnetic compound fertiliser material product of magnetic carrier with the industrial and mining waste; Nutrient loss in the control fertilizer, improvement are to reach the purpose that increases production and improves productivity to situations such as low, the common chemical fertilizer of chemical fertilizer utilization ratio causes that agricultural land soil hardens in industrial and mineral noxious waste pollution environment, the agriculture prodn.
The present invention adopts following technical scheme to achieve these goals:
A kind of slowly-releasing magnetic compound fertiliser is characterized in that, it is to be processed by the raw material of following weight parts: 85-90 parts of composite fertilizers, 5-10 parts of magnetic carriers, 2-8 parts of fertilizer slow-release formulations.
Described a kind of slowly-releasing magnetic compound fertiliser is characterized in that: described composite fertilizer is processed by the raw material of following weight parts: 5-12 parts in urea, 25-35 parts of ammonium chlorides, 25-35 parts of monoammonium phosphates, 20-30 parts in Repone K.
Described a kind of slowly-releasing magnetized compound fertilizer is characterized in that: described magnetic carrier material is treated efflorescence 60-80 purpose iron selection tailings ores in sand form., also contain soya-bean oil 1-2 part in the described composite fertilizer.
Described a kind of slowly-releasing magnetized compound fertilizer is characterized in that: the fertilizer slow-release formulation that wherein adds is the fertilizer nutrient sustained release dosage that Anhui Province Diyuan Biotechnology CO.,Ltd produces.
Described a kind of slowly-releasing magnetized compound fertilizer is characterized in that: fertilizer nutrient turnover rate≤75% in the leaching test.
Described a kind of slowly-releasing magnetized compound fertilizer is characterized in that: granulation process adopts tower granulation technology in the fertilizer course of processing.
The preparation method of described slowly-releasing magnetic compound fertiliser is characterized in that:
A, with the broken in proportion mixing of all raw materials;
B, utilize tower granulation technology to carry out granulation; The tower granulation process application has in the magnetic fertilizer granulation process
After C, the granulation, fertilizer screening removing adulterated powder or block defective part, and is squeezed into granulating equipment with it as returning charge and utilized again, the granulated fertilizer after must sieving;
D, the granulated fertilizer after will sieving carry out magnetic field treatment through adjustable permanent magnet magnetization handler;
E, the granulated fertilizer that carries out after the magnetic field treatment carry out drying treatment in dryer, remove moisture to be up to state standards, again in cooler, with dried material cooling;
F, cooled finished product materials is carried out metering packing by specification, product.
The adjustable permanent magnet magnetization handler that uses in this slowly-releasing magnetized compound fertilizer magnetic history; Utilize closed magnetic system and special to gather magnetic technology and make the field intensity of operation interval can be adjustable continuously in 0.1-0.5T scope, to satisfy the production needs of high, medium and low different concns magnetic fertilizer.
Beneficial effect of the present invention does
1 increasing both production and income, raising utilization rate of fertilizer
The magnetic compound fertiliser material all has tangible effect of increasing production to food crop, cash crop, vegetables, fruit tree etc.In soil, apply the magnetic compound fertiliser material,, the magnetic in the soil is increased through the effect of " remanent magnetism " in the fertilizer; And then raising soil magnetism and biomagnetism effect; Improve the microcirculation of soil and crop, bring into play the fertilizer efficiency of fertilizer more fully, improve fertilizer utilization ratio.
2 improve the physical and chemical character of soil
Used the plot of magnetic compound fertiliser material, soil physical chemistry character can be significantly improved.Experiment showed, and use the magnetic compound fertiliser material can improve the soil granulation structure, reduce the soil weight, improve soil permeability, ventilation property.The contained magneticsubstance of magnetic fertilizer generally belongs to alkalescence, can reduce the hydrolytic acidity and raising pH value of soil, promotes the increase of phosphorus and micro-validity.
3 raisings are made microbic activity and are promoted soil nutrient to transform
Apply magnetic fertilizer in the farmland, weak magnetic can make the root system of plant fix, and promotes cell fission, directional magnetic field to help seed and germinate fast, to promote seed germination and growth, anti-, improve crops quality good effect arranged.In addition, every molar magnetite gradates in soil, can discharge 155 card heats, thereby in the farmland, has used the mineralization and other oxygenizement that magnetic composite fertilizer can promote soil with organic matter; The magnetization of magnetic composite fertilizer is applied to soil can also make nutrient contents such as soil available nitrogen, potassium increase.
4 magnetization slow release fertilizers have magnetization and fertilizer slow release effect simultaneously
Remanent magnetism in the magnetic fertilizer all improves significantly for edatope and the growth of crop own; Added the loss that not only can reduce fertilizer behind the fertilizer slow release material; Improve utilization rate of fertilizer; Can also increase the life-span of remanent magnetism in the magnetic fertilizer simultaneously, make the magnetic effect of magnetic fertilizer more long lastingly cause wholesome effect soil and crop.Increasing soya-bean oil in the fertilizer, is the hydrophobicity of utilizing soya-bean oil, makes fertilizer be difficult for by water-solubleization loss.
5 adopt the tower granulation technological advantage outstanding
The tower granulation process application in the magnetic compound fertiliser material have that technical process is short, heat exhaustion is low, advantage such as investment cost is economized, quality product height and environmental benefit are good.
Embodiment
A kind of slowly-releasing magnetic compound fertiliser material; Its embodiment is for composite fertilizer material (comprising urea, ammonium chloride, ammonium phosphate, Repone K etc.), magnetic carrier (iron selection tailings ore in sand form) and fertilizer slow-release formulation is broken mixes, and granulation is magnetized processing then and carried out screening and packing at last and form through tower granulation technology.
Embodiment 1
The metering of 1 proportioning raw materials
25 parts of composite fertilizer material ammonium chlorides, 22 parts in Repone K, 30 parts of monoammonium phosphates, 10 parts in urea and 8 parts in iron selection tailings ore in sand form and fertilizer slow-release formulation are carried out the broken then mixing of proportioning raw materials for 5 parts.
2 granulations
Utilizing tower granulation technology to carry out granulation of fertilizer handles.
3 screenings
After the granulation, fertilizer screening removing adulterated powder or block defective part, and is utilized it as returning charge again.
4 magnetization are handled
Use adjustable permanent magnet magnetization handler, efficient fertilizer to granulating and forming magnetizes the processing fertilizer that coating is good and carries out magnetic field treatment through adjustable permanent magnet magnetization handler.
5 dry coolings
Granulated fertilizer after the screening carries out drying treatment in dryer, remove moisture to be up to state standards, again in cooler, with dried material cooling.
6 metering packings
Cooled finished product materials is carried out metering packing by specification.
Embodiment 2
The metering of 1 proportioning raw materials
22 parts of composite fertilizer material ammonium chlorides, 25 parts in Repone K, 28 parts of monoammonium phosphates, 12 parts in urea and 8 parts in iron selection tailings ore in sand form and fertilizer slow-release formulation are carried out the broken then mixing of proportioning raw materials for 3 parts.
2 granulations
Utilizing tower granulation technology to carry out granulation of fertilizer handles.
3 screenings
After the granulation, fertilizer screening removing adulterated powder or block defective part, and is utilized it as returning charge again.
4 magnetization are handled
Use adjustable permanent magnet magnetization handler, efficient fertilizer to granulating and forming magnetizes the processing fertilizer that coating is good and carries out magnetic field treatment through adjustable permanent magnet magnetization handler.
5 dry coolings
Granulated fertilizer after the screening carries out drying treatment in dryer, remove moisture to be up to state standards, again in cooler, with dried material cooling.
6 metering packings
Cooled finished product materials is carried out metering packing by specification.
Embodiment 3
The metering of 1 proportioning raw materials
With 27 parts of composite fertilizer material ammonium chlorides, 22 parts in Repone K, 30 parts of monoammonium phosphates, 8 parts in urea and 10 parts in iron selection tailings ore in sand form and 5 parts of fertilizer slow-release formulations, soya-bean oil 1-2 part, carry out the broken then mixing of proportioning raw materials.
2 granulations
Utilizing tower granulation technology to carry out granulation of fertilizer handles.
3 screenings
After the granulation, fertilizer screening removing adulterated powder or block defective part, and is utilized it as returning charge again.
4 magnetization are handled
Use adjustable permanent magnet magnetization handler, efficient fertilizer to granulating and forming magnetizes the processing fertilizer that coating is good and carries out magnetic field treatment through adjustable permanent magnet magnetization handler.
5 dry coolings
Granulated fertilizer after the screening carries out drying treatment in dryer, remove moisture to be up to state standards, again in cooler, with dried material cooling.
6 metering packings
Cooled finished product materials is carried out metering packing by specification.
Embodiment 4
The metering of 1 proportioning raw materials
25 parts of composite fertilizer material ammonium chlorides, 24 parts in Repone K, 32 parts of monoammonium phosphates, 9 parts in urea and 10 parts in iron selection tailings ore in sand form and fertilizer slow-release formulation are carried out the broken then mixing of proportioning raw materials for 5 parts.
2 granulations
Utilizing tower granulation technology to carry out granulation of fertilizer handles.
3 screenings
After the granulation, fertilizer screening removing adulterated powder or block defective part, and is utilized it as returning charge again.
4 magnetization are handled
Use adjustable permanent magnet magnetization handler, efficient fertilizer to granulating and forming magnetizes the processing fertilizer that coating is good and carries out magnetic field treatment through adjustable permanent magnet magnetization handler.
5 dry coolings
Granulated fertilizer after the screening carries out drying treatment in dryer, remove moisture to be up to state standards, again in cooler, with dried material cooling.
6 metering packings
Cooled finished product materials is carried out metering packing by specification.
Claims (7)
1. a slowly-releasing magnetized compound fertilizer is characterized in that, it is to be processed by the raw material of following weight parts: 85-90 parts of common composite fertilizer materials, 5-10 parts of magnetic carriers, 2-8 parts of fertilizer slow-release formulations.
2. a kind of slowly-releasing magnetized compound fertilizer according to claim 1 is characterized in that: described composite fertilizer material is to be processed by the raw material of following weight parts: 5-12 parts in urea, 25-35 parts of ammonium chlorides, 25-35 parts of monoammonium phosphates, 20-30 parts in Repone K.
3. a kind of slowly-releasing magnetized compound fertilizer according to claim 1 is characterized in that: described magnetic carrier material is treated efflorescence 60-80 purpose iron selection tailings ores in sand form, also contains soya-bean oil 1-2 part in the described composite fertilizer.
4. a kind of slowly-releasing magnetized compound fertilizer according to claim 1 is characterized in that: the fertilizer slow-release formulation that wherein adds is the fertilizer nutrient sustained release dosage that Anhui Province Diyuan Biotechnology CO.,Ltd produces.
5. a kind of slowly-releasing magnetized compound fertilizer according to claim 1 is characterized in that: fertilizer nutrient turnover rate≤75% in the leaching test.
6. a kind of slowly-releasing magnetized compound fertilizer according to claim 1 is characterized in that: granulation process adopts tower granulation technology in the fertilizer course of processing.
7. according to claim 1 or 3 described slowly-releasing magnetized compound fertilizers, it is characterized in that: concrete preparation method is:
A, with the broken in proportion mixing of all raw materials;
B, utilize tower granulation technology to carry out granulation;
After C, the granulation, fertilizer screening removing adulterated powder or block defective part, and is squeezed into granulating equipment with it as returning charge and utilized again, the granulated fertilizer after must sieving;
D, the granulated fertilizer after will sieving carry out magnetic field treatment through adjustable permanent magnet magnetization handler;
E, the granulated fertilizer that carries out after the magnetic field treatment carry out drying treatment in dryer, remove moisture to be up to state standards, again in cooler, with dried material cooling;
F, cooled finished product materials is carried out metering packing by specification, product.
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Cited By (10)
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| CN102974604A (en) * | 2012-12-17 | 2013-03-20 | 本溪清迈尾矿综合利用有限公司 | Method and product for producing soil remediation fertilizer by utilizing high-silicon iron tailings |
| CN104892091A (en) * | 2015-05-06 | 2015-09-09 | 广西贵港市丰收肥业有限公司 | Magnetic fertilizer used for eucalyptus and production method thereof |
| CN106187476A (en) * | 2016-07-11 | 2016-12-07 | 安徽金蓼复合磁化肥有限公司 | A kind of Semen Tritici aestivi special slow release magnetic compound fertiliser material and preparation method thereof |
| CN106187587A (en) * | 2016-07-11 | 2016-12-07 | 安徽金蓼复合磁化肥有限公司 | A kind of rapeseed cultivation slow release magnetic compound fertiliser material and preparation method thereof |
| CN107129342A (en) * | 2016-02-29 | 2017-09-05 | 李季 | It is a kind of to carry complex fertilizer of the remanent magnetism containing organic matter |
| CN108218574A (en) * | 2018-01-30 | 2018-06-29 | 金华市农业科学研究院 | A kind of fertilizer packet and its application method |
| CN108530174A (en) * | 2018-05-25 | 2018-09-14 | 河南东大科技股份有限公司 | It is a kind of to have the characteristics that the fertilizer specially for wheat of single fertilization |
| CN109704883A (en) * | 2019-01-23 | 2019-05-03 | 三峡大学 | A kind of aquogel type polyphosphoric acid ammonium magnetic fertilizer and preparation method |
| CN113135800A (en) * | 2021-05-27 | 2021-07-20 | 辽宁东北丰专用肥有限公司 | Organic magnetized carbon-based fertilizer and preparation method thereof |
| CN113880657A (en) * | 2021-11-17 | 2022-01-04 | 安徽丰蓼铁尾砂缓释磁化矿物肥有限公司 | Magnetized slow-release mineral fertilizer and preparation method thereof |
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| CN102974604A (en) * | 2012-12-17 | 2013-03-20 | 本溪清迈尾矿综合利用有限公司 | Method and product for producing soil remediation fertilizer by utilizing high-silicon iron tailings |
| CN102974604B (en) * | 2012-12-17 | 2015-04-15 | 本溪清迈尾矿综合利用有限公司 | Method and product for producing soil remediation fertilizer by utilizing high-silicon iron tailings |
| CN104892091A (en) * | 2015-05-06 | 2015-09-09 | 广西贵港市丰收肥业有限公司 | Magnetic fertilizer used for eucalyptus and production method thereof |
| CN107129342A (en) * | 2016-02-29 | 2017-09-05 | 李季 | It is a kind of to carry complex fertilizer of the remanent magnetism containing organic matter |
| CN106187476A (en) * | 2016-07-11 | 2016-12-07 | 安徽金蓼复合磁化肥有限公司 | A kind of Semen Tritici aestivi special slow release magnetic compound fertiliser material and preparation method thereof |
| CN106187587A (en) * | 2016-07-11 | 2016-12-07 | 安徽金蓼复合磁化肥有限公司 | A kind of rapeseed cultivation slow release magnetic compound fertiliser material and preparation method thereof |
| CN108218574A (en) * | 2018-01-30 | 2018-06-29 | 金华市农业科学研究院 | A kind of fertilizer packet and its application method |
| CN108530174A (en) * | 2018-05-25 | 2018-09-14 | 河南东大科技股份有限公司 | It is a kind of to have the characteristics that the fertilizer specially for wheat of single fertilization |
| CN109704883A (en) * | 2019-01-23 | 2019-05-03 | 三峡大学 | A kind of aquogel type polyphosphoric acid ammonium magnetic fertilizer and preparation method |
| CN113135800A (en) * | 2021-05-27 | 2021-07-20 | 辽宁东北丰专用肥有限公司 | Organic magnetized carbon-based fertilizer and preparation method thereof |
| CN113880657A (en) * | 2021-11-17 | 2022-01-04 | 安徽丰蓼铁尾砂缓释磁化矿物肥有限公司 | Magnetized slow-release mineral fertilizer and preparation method thereof |
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Application publication date: 20120801 |