CN108586144A - A kind of flyash soil conditioner and preparation method thereof - Google Patents
A kind of flyash soil conditioner and preparation method thereof Download PDFInfo
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- CN108586144A CN108586144A CN201810611044.6A CN201810611044A CN108586144A CN 108586144 A CN108586144 A CN 108586144A CN 201810611044 A CN201810611044 A CN 201810611044A CN 108586144 A CN108586144 A CN 108586144A
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- eupatorium adenophorum
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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
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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Abstract
The invention discloses a kind of flyash soil conditioners and preparation method thereof, the soil conditioner in parts by weight, is made of 1 ~ 2 part of 30 ~ 50 parts of flyash, 20 ~ 30 parts of Eupatorium adenophorum, 10 ~ 18 parts of ammonium sulfate, 3 ~ 6 parts of monoammonium phosphate, 8 ~ 16 parts of vinasse, 8 ~ 15 parts of bentonite, 10 ~ 14 parts of ureaformaldehyde, 4 ~ 8 parts of potassium dihydrogen phosphate, 12 ~ 18 parts of chicken manure, 6 ~ 10 parts of wormcast and complex micro organism fungicide.Modifying agent prepared by the present invention has effects that significantly to improve and repair to the soil of degeneration, soil organic matter content can be increased, improve the effective active bacteria number of soil, improved soil nodule structure, improve soil acidity or alkalinity, increase buffering power of soil and retain water and nutrients ability, keeps soil ecology balance, the radioactive element in fixing soil, reduce radioactive element migration, its potential information requirement is reduced, the pollution of soil radioactivity element is alleviated, there is extensive market application prospect.
Description
Technical field
The present invention relates to agricultural technology field, the environmental technology field for utilizing waste is also related to, specifically
For, it is related to a kind of soil conditioner and preparation method thereof prepared using industrial waste.
Background technology
Currently, chemical pesticide constitutes threat to the sustainable development of agricultural, chemical fertilizer, pesticide are widely used in agriculture life
Production, continuous expansion, the soil by machines operation of a large amount of inputs, irrigated area of the agricultural chemicals such as chemical fertilizer, pesticide and herbicide are strong
The resistance to fertile kind of the continuous improvement of degree, crop weed out the old and bring forth the new and constantly bringing forth new ideas for cultivation technique has pushed global agricultural product to produce jointly
The quick increase of amount.At the same time, chemical farming also brings the serious ecological problem such as environmental pollution, to the sustainable of agricultural
Development constitutes threat.
Still further aspect, with the fast development of nuclear energy science and technology, big Indium isotopes application, radioactivity ore mining smelting, state
The activities such as anti-scientific research and testing, the disposition of radwaste and the gradually opening of nuclear weapon test base, cause environment to be put
Radioactive pollution problem getting worse.Wherein, the improvement and reparation of the contaminated soil containing radionuclide are of increasing concern.Have
There are many improvement and the recovery technique for closing radioactive pollution soil, including engineering, physics, chemistry, biological method and its joint technology.
Traditional administering method is as using the mechanical cleaning process containing surfactant, ion-exchange-resin process, membrane separation process and acidleach
Method etc., there is capital expenditure height, processing cost is big, treatment effect is undesirable and easily causes the problems such as secondary pollution.Closely
Research emphasis is increasingly turned to biochemical processing over year, and research finds that many microbial adsorbents can be used for heavy metal and radiation
The processing of property waste water.But since organism itself is limited by all many conditions, it is made to be difficult to be widely applied.
Soil conditioner can improve soil texture, improve soil physical and chemical property, abundant soil nutrient, improve soil water-retaining
Fertilizer-preserving ability improves biological activity of soil, maintains soil ecology balance.At present using soil conditioner type include organic,
Inorganic chemistry class, biological species etc..But current soil conditioner is all the component of single kind mostly, so improvement soil
The effect is unsatisfactory.
Invention content
In view of this, the object of the present invention is to provide a kind of flyash soil conditioner and preparation method thereof, it is existing to solve
Have soil conditioner effect undesirable and.
The present invention solves above-mentioned technical problem by the following technical programs：
A kind of flyash soil conditioner, in parts by weight, by 30 ~ 50 parts of flyash, 20 ~ 30 parts of Eupatorium adenophorum, ammonium sulfate 10 ~
18 parts, 3 ~ 6 parts of monoammonium phosphate, 8 ~ 16 parts of vinasse, 8 ~ 15 parts of bentonite, 10 ~ 14 parts of ureaformaldehyde, 4 ~ 8 parts of potassium dihydrogen phosphate, chicken manure
1 ~ 2 part of 12 ~ 18 parts, 6 ~ 10 parts of wormcast and complex micro organism fungicide are made.
Preferably, by 35 ~ 45 parts of flyash, 22 ~ 28 parts of Eupatorium adenophorum, 12 ~ 16 parts of ammonium sulfate, 4 ~ 5 parts of monoammonium phosphate, wine
10 ~ 14 parts of grain, 10 ~ 13 parts of bentonite, 11 ~ 13 parts of ureaformaldehyde, 5 ~ 7 parts of potassium dihydrogen phosphate, 13 ~ 17 parts of chicken manure, 7 ~ 9 parts of wormcast
And 1.2 ~ 1.8 parts of complex micro organism fungicide is made.
More preferentially, by 40 parts of flyash, 26 parts of Eupatorium adenophorum, 14 parts of ammonium sulfate, 4.5 parts of monoammonium phosphate, 12 parts of vinasse,
1.4 parts of 11 parts of bentonite, 12 parts of ureaformaldehyde, 6 parts of potassium dihydrogen phosphate, 15 parts of chicken manure, 8 parts of wormcast and complex micro organism fungicide
It is made.
The complex micro organism fungicide is Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus
The composite bacteria agent formed.
The Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus weight ratio be（2~
3）：（1~2）：（1~3）：（1~2）.
Alkaliphilic bacillus in the complex micro organism fungicide（1.2~1.8）× 108cfu/g, bacillus laterosporus（0.8~
1.6）× 108cfu/g, bacillus pumilus（0.5~0.8）× 108cfu/g, streptomyces aureus（0.8~1.2）×108cfu/g.
The preparation method of the flyash soil conditioner includes the following steps：
（1）200 ~ 250 DEG C of temperature is used to be dried to moisture for 4 ~ 6%, then by powder flyash, vinasse and bentonite
It is 100 ~ 200 targeted fine powders that coal ash, vinasse and bentonite, which are ground into grain size, for use；
（2）Eupatorium adenophorum is crushed, then is baked to, Eupatorium adenophorum is then put into retort high temperature charing process, is obtained
Eupatorium adenophorum charcoal, for use；Eupatorium adenophorum charcoal has huge surface area and numerous small structures, is easy aggregation absorption nutrition and supports
Divide object, promotes beneficial microorganism growth, to be conducive to the growth of plant；It is easier to form macro aggregate in the soil, promote
The absorption and holding of the nutrient ion of soil, the addition of Eupatorium adenophorum charcoal have played excitation to the soil organism, have been conducive to soil
The decomposition of original organic matter in earth, further increases the fertility of soil, has coordinated the fertilizer and fertilizer-preserving ability of soil, ensure that
Plant has sufficient nutrient supply, Eupatorium adenophorum charcoal that the radioactive element in soil can also be fixed, and reduces radioactivity member
Element migration, reduces its potential information requirement, alleviates the pollution of soil radioactivity element；
（3）By step（1）Handle the flyash, vinasse and bentonite fine powder, step obtained（2）Eupatorium adenophorum charcoal, the sulphur of acquisition
Sour ammonium, monoammonium phosphate, ureaformaldehyde, potassium dihydrogen phosphate, chicken manure, wormcast and complex micro organism fungicide are mixed evenly, so
After dry to get.
The step（2）In, Eupatorium adenophorum is crushed to the powder for being a diameter of 1 ~ 3mm；Then by it at 60 ~ 100 DEG C
At a temperature of be dried to moisture be 4 ~ 7%, then Eupatorium adenophorum is put into retort, retort is warming up to 200 ~ 300 DEG C
Keep 4 ~ 5h；Then the temperature of retort is increased to 400 ~ 600 DEG C of 10 ~ 14h of holding；Then 850 ~ 950 are raised the temperature to
Retort is closed after DEG C, stopping is passed through air, and to get Eupatorium adenophorum charcoal after 62 ~ 68h of holding.
The step（3）In, by step（1）Handle the flyash, vinasse and bentonite fine powder, step obtained（2）It obtains
Eupatorium adenophorum charcoal, ammonium sulfate, monoammonium phosphate, ureaformaldehyde, potassium dihydrogen phosphate, chicken manure, wormcast and complex micro organism fungicide
Mixture be dried at a temperature of 80 ~ 120 DEG C moisture be 4 ~ 6% to get.
The beneficial effects of the present invention are：Modifying agent prepared by the present invention has significant improvement and repaiies to the soil of degeneration
Multiple effect, can increase soil organic matter content, improve the effective active bacteria number of soil, improved soil nodule structure, improvement soil acid
Basicity increases buffering power of soil and retain water and nutrients ability, and soil ecology is kept to balance, the radioactive element in fixing soil,
Radioactive element migration is reduced, its potential information requirement is reduced, alleviates the pollution of soil radioactivity element, there is extensive market
Application prospect.The present invention can effectively solve the ring that flyash zone of illuviation comes by being used for flyash to prepare soil conditioner
Border pollution problem, and the soil conditioner prepared can obtain preferable economic benefit.
Specific implementation mode
In order to facilitate the understanding of those skilled in the art, below in conjunction with embodiment, the present invention will be further described.
Embodiment is only to the invention for example, not being limitation of the invention, the step of not illustrated in embodiment
It is prior art, is not described in detail herein.
Embodiment one
Raw material：
Flyash 30kg, Eupatorium adenophorum 20kg, ammonium sulfate 10kg, monoammonium phosphate 3kg, vinasse 8kg, bentonite 8kg, ureaformaldehyde
10kg, potassium dihydrogen phosphate 4kg, chicken manure 12kg, wormcast 6kg and complex micro organism fungicide 1kg.
The complex micro organism fungicide is Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus
The composite bacteria agent formed.
The Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus weight ratio be 2：1：
1：1.
1.2 × 108cfu/g of Alkaliphilic bacillus, bacillus laterosporus 0.8 in the complex micro organism fungicide ×
108cfu/g, 0.5 × 108cfu/g of bacillus pumilus, 0.8 × 108cfu/g of streptomyces aureus.
Preparation method：
（1）200 DEG C of temperature is used to be dried to moisture for 4%, then by flyash, wine flyash, vinasse and bentonite
It is 100 targeted fine powders that grain and bentonite, which are ground into grain size, for use；
（2）Eupatorium adenophorum is crushed to the powder for being a diameter of 1mm；Then it is dried to moisture at a temperature of 60 DEG C is
4%, then Eupatorium adenophorum is put into retort, retort is warming up to 200 DEG C of holding 4h；Then by the temperature liter of retort
Height keeps 10h to 400 DEG C；Then retort is closed after raising the temperature to 850 DEG C, stopping is passed through air, and after keeping 62h,
Up to Eupatorium adenophorum charcoal, for use；
（3）By step（1）Handle the flyash, vinasse and bentonite fine powder, step obtained（2）Eupatorium adenophorum charcoal, the sulphur of acquisition
Sour ammonium, monoammonium phosphate, ureaformaldehyde, potassium dihydrogen phosphate, chicken manure, wormcast and complex micro organism fungicide mixture at 80 DEG C
At a temperature of be dried to moisture be 4% to get.
Soil conditioner made from the present embodiment is applied in wheat paddock respectively with conventional soil conditioner to test,
Under the conditions of fertilizer amount is equal, soil conditioner made from the present embodiment increases production 63.6 kilograms per acre than conventional soil conditioner,
Through nutritional ingredient, monitoring center is detected, and the nutrient composition content in wheat improves 3.9%.
Iodine 131 simple substance pollution concentration is the soil of 4.32mg/g, and the content of organic matter 3.7%, clay content is
36.2%, pH value 5.5.100g contaminated soils are added in beaker, then add made from 5.0% the present embodiment of soil weight
Soil conditioner is simultaneously uniformly mixed；5.0% pollution-free soil is added as a contrast with 100g contaminated soils simultaneously.Add into soil
Enter 1L pure water to be impregnated, is once stirred per 10h, water and soil is made to be come into full contact with.After processing 2 days, soil is measured respectively
Content of iodine in iodine residual quantity and liquid phase in solid phase, the results show that after processing soil conditioner made from addition the present embodiment soil
The more no added control of iodine residual quantity improves 64.1% in earth.
Embodiment two
Raw material：
Flyash 50kg, Eupatorium adenophorum 30kg, ammonium sulfate 18kg, monoammonium phosphate 6kg, vinasse 16kg, bentonite 15kg, ureaformaldehyde
14kg, potassium dihydrogen phosphate 8kg, chicken manure 18kg, wormcast 10kg and complex micro organism fungicide 2kg.
The complex micro organism fungicide is Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus
The composite bacteria agent formed.
The Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus weight ratio be 3：2：
3：2.
1.8 × 108cfu/g of Alkaliphilic bacillus, bacillus laterosporus 1.6 in the complex micro organism fungicide ×
108cfu/g, 0.8 × 108cfu/g of bacillus pumilus, 1.2 × 108cfu/g of streptomyces aureus.
Preparation method：
（1）250 DEG C of temperature is used to be dried to moisture for 6%, then by flyash, wine flyash, vinasse and bentonite
It is 200 targeted fine powders that grain and bentonite, which are ground into grain size, for use；
（2）Eupatorium adenophorum is crushed to the powder for being a diameter of 3mm；Then it is dried to moisture at a temperature of 100 DEG C
It is 7%, then Eupatorium adenophorum is put into retort, retort is warming up to 300 DEG C of holding 5h；Then by the temperature of retort
It is increased to 600 DEG C of holding 14h；Then retort is closed after raising the temperature to 950 DEG C, stopping is passed through air, and keeps 68h
Afterwards to get Eupatorium adenophorum charcoal, for use；
（3）By step（1）Handle the flyash, vinasse and bentonite fine powder, step obtained（2）Eupatorium adenophorum charcoal, the sulphur of acquisition
Sour ammonium, monoammonium phosphate, ureaformaldehyde, potassium dihydrogen phosphate, chicken manure, wormcast and complex micro organism fungicide mixture at 120 DEG C
At a temperature of be dried to moisture be 6% to get.
Soil conditioner made from the present embodiment is applied in corn field respectively with conventional soil conditioner to test,
Under the conditions of fertilizer amount is equal, soil conditioner made from the present embodiment increases production corn 124.3 per acre than conventional soil conditioner
Kilogram.
Iodine 131 simple substance pollution concentration is the soil of 3.58mg/g, and the content of organic matter 3.2%, clay content is
30.9%, pH value 5.0.100g contaminated soils are added in beaker, then add made from 5.0% the present embodiment of soil weight
Soil conditioner is simultaneously uniformly mixed；5.0% pollution-free soil is added as a contrast with 100g contaminated soils simultaneously.1L water is added
It is impregnated, is once stirred per 10h, water and soil is made to be come into full contact with.After processing 2 days, iodine in solid phase of soil is measured respectively
Content of iodine in residual quantity and liquid phase, the results show that iodine is residual in the soil of soil conditioner made from addition the present embodiment after processing
The more no added control of allowance improves 67.0%, there is significant raising.
Embodiment three
Raw material：
Flyash 40kg, Eupatorium adenophorum 26kg, ammonium sulfate 14kg, monoammonium phosphate 4.5kg, vinasse 12kg, bentonite 11kg, urea first
Aldehyde 12kg, potassium dihydrogen phosphate 6kg, chicken manure 15kg, wormcast 8kg and complex micro organism fungicide 1.4kg.
The complex micro organism fungicide is Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus
The composite bacteria agent formed.
The Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus weight ratio be 2.5：
1.5：2：1.5.
1.4 × 108cfu/g of Alkaliphilic bacillus, bacillus laterosporus 1.0 in the complex micro organism fungicide ×
108cfu/g, 0.6 × 108cfu/g of bacillus pumilus, 1.1 × 108cfu/g of streptomyces aureus.
The preparation method of the flyash soil conditioner includes the following steps：
（1）220 DEG C of temperature is used to be dried to moisture for 5%, then by flyash, wine flyash, vinasse and bentonite
It is 160 targeted fine powders that grain and bentonite, which are ground into grain size, for use；
（2）Eupatorium adenophorum is crushed to the powder for being a diameter of 2mm；Then it is dried to moisture at a temperature of 80 DEG C is
5%, then Eupatorium adenophorum is put into retort, retort is warming up to 250 DEG C of holding 4.5h；Then by the temperature of retort
It is increased to 500 DEG C of holding 12h；Then retort is closed after raising the temperature to 900 DEG C, stopping is passed through air, and keeps 64h
Afterwards to get Eupatorium adenophorum charcoal, for use；
（3）By step（1）Handle the flyash, vinasse and bentonite fine powder, step obtained（2）Eupatorium adenophorum charcoal, the sulphur of acquisition
Sour ammonium, monoammonium phosphate, ureaformaldehyde, potassium dihydrogen phosphate, chicken manure, wormcast and complex micro organism fungicide mixture at 100 DEG C
At a temperature of be dried to moisture be 5% to get.
Soil conditioner made from the present embodiment is applied in buckwheat field respectively with conventional soil conditioner to test,
Under the conditions of fertilizer amount is equal, soil conditioner made from the present embodiment increases production 47.3 kilograms per acre than conventional soil conditioner.
With the soil of a concentration of 3.56mg/g of Ce 137 ionic soil, the content of organic matter 3.1%, clay content is
30.2%.100g contaminated soils are added in beaker, then spreads fertilizer over the fields and adds soil made from 5.0% the present embodiment of soil weight and change
It good dose and is uniformly mixed；5.0% pollution-free soil is added as a contrast with 100g contaminated soils simultaneously.It is pure that 1L is added into soil
Water is impregnated, and is once stirred per 10h, water and soil is made to be come into full contact with.After processing 2 days, measure in solid phase of soil respectively
Caesium content in caesium residual quantity and liquid phase, the results show that adding caesium in the soil of soil conditioner made from the present embodiment after processing
The more no added control of ion residues amount improves 694.8%.
Claims (9)
1. a kind of flyash soil conditioner, it is characterised in that：In parts by weight, by 30 ~ 50 parts of flyash, Eupatorium adenophorum 20 ~
30 parts, 10 ~ 18 parts of ammonium sulfate, 3 ~ 6 parts of monoammonium phosphate, 8 ~ 16 parts of vinasse, 8 ~ 15 parts of bentonite, 10 ~ 14 parts of ureaformaldehyde, di(2-ethylhexyl)phosphate
1 ~ 2 part of 4 ~ 8 parts of hydrogen potassium, 12 ~ 18 parts of chicken manure, 6 ~ 10 parts of wormcast and complex micro organism fungicide are made.
2. flyash soil conditioner as described in claim 1, it is characterised in that：By 35 ~ 45 parts of flyash, Eupatorium adenophorum 22
~ 28 parts, 12 ~ 16 parts of ammonium sulfate, 4 ~ 5 parts of monoammonium phosphate, 10 ~ 14 parts of vinasse, 10 ~ 13 parts of bentonite, 11 ~ 13 parts of ureaformaldehyde, phosphorus
1.2 ~ 1.8 parts of 5 ~ 7 parts of acid dihydride potassium, 13 ~ 17 parts of chicken manure, 7 ~ 9 parts of wormcast and complex micro organism fungicide are made.
3. flyash soil conditioner as described in claim 1, it is characterised in that：By 40 parts of flyash, 26 parts of Eupatorium adenophorum,
14 parts of ammonium sulfate, 4.5 parts of monoammonium phosphate, 12 parts of vinasse, 11 parts of bentonite, 12 parts of ureaformaldehyde, 6 parts of potassium dihydrogen phosphate, chicken manure 15
1.4 parts of part, 8 parts of wormcast and complex micro organism fungicide are made.
4. the flyash soil conditioner as described in claim 1 ~ 3 any one, it is characterised in that：The composite microbial bacteria
The composite bacteria agent that agent is made of Alkaliphilic bacillus, bacillus laterosporus, bacillus pumilus, streptomyces aureus.
5. the flyash soil conditioner as described in claim 1 ~ 3 any one, it is characterised in that：The basophilic gemma bar
Bacterium, bacillus laterosporus, bacillus pumilus, streptomyces aureus weight ratio be（2~3）：（1~2）：（1~3）：（1~2）.
6. the flyash soil conditioner as described in claim 1 ~ 3 any one, it is characterised in that：The composite microbial bacteria
Alkaliphilic bacillus in agent（1.2~1.8）× 108cfu/g, bacillus laterosporus（0.8~1.6）× 108cfu/g, short and small gemma
Bacillus（0.5~0.8）× 108cfu/g, streptomyces aureus（0.8~1.2）×108cfu/g.
7. the preparation method of the flyash soil conditioner as described in claim 1 ~ 3 any one, it is characterised in that including with
Lower step：
（1）200 ~ 250 DEG C of temperature is used to be dried to moisture for 4 ~ 6%, then by powder flyash, vinasse and bentonite
It is 100 ~ 200 targeted fine powders that coal ash, vinasse and bentonite, which are ground into grain size, for use；
（2）Eupatorium adenophorum is crushed, then is baked to, Eupatorium adenophorum is then put into retort high temperature charing process, is obtained
Eupatorium adenophorum charcoal, for use；
（3）By step（1）Handle the flyash, vinasse and bentonite fine powder, step obtained（2）Eupatorium adenophorum charcoal, the sulphur of acquisition
Sour ammonium, monoammonium phosphate, ureaformaldehyde, potassium dihydrogen phosphate, chicken manure, wormcast and complex micro organism fungicide are mixed evenly, so
After dry to get.
8. the preparation method of flyash soil conditioner as claimed in claim 7, it is characterised in that：The step（2）In, it will
The powder that it is a diameter of 1 ~ 3mm that Eupatorium adenophorum, which crushes,；Then it is dried at a temperature of 60 ~ 100 DEG C moisture be 4 ~
7%, then Eupatorium adenophorum is put into retort, retort is warming up to 200 ~ 300 DEG C of 4 ~ 5h of holding；Then by retort
Temperature is increased to 400 ~ 600 DEG C of 10 ~ 14h of holding；Then retort is closed after raising the temperature to 850 ~ 950 DEG C, stops being passed through
Air, and to get Eupatorium adenophorum charcoal after 62 ~ 68h of holding.
9. the preparation method of flyash soil conditioner as claimed in claim 7, it is characterised in that：The step（3）In, it will
Step（1）Handle the flyash, vinasse and bentonite fine powder, step obtained（2）Eupatorium adenophorum charcoal, ammonium sulfate, the phosphoric acid of acquisition
Temperature of the mixture at 80 ~ 120 DEG C of monoammonium, ureaformaldehyde, potassium dihydrogen phosphate, chicken manure, wormcast and complex micro organism fungicide
Under be dried to moisture be 4 ~ 6% to get.
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| CN109627119A (en) * | 2019-01-08 | 2019-04-16 | 贵州芭田生态工程有限公司 | Phosphate Fertilizer Nitrate with Frozen Method waste residue prepares the method and soil conditioner of soil conditioner |
| CN113462399A (en) * | 2021-07-23 | 2021-10-01 | 山东省农业科学院 | Coal ash-based sand ginger black soil modifier and preparation method and application thereof |
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