CN108101591A - A kind of preparation process and method of microbial liquid organic fertilizer - Google Patents
A kind of preparation process and method of microbial liquid organic fertilizer Download PDFInfo
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- CN108101591A CN108101591A CN201711428849.9A CN201711428849A CN108101591A CN 108101591 A CN108101591 A CN 108101591A CN 201711428849 A CN201711428849 A CN 201711428849A CN 108101591 A CN108101591 A CN 108101591A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F11/00—Other organic fertilisers
- C05F11/08—Organic fertilisers containing added bacterial cultures, mycelia or the like
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F11/00—Other organic fertilisers
-
- 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
- C05G5/20—Liquid fertilisers
Abstract
The invention discloses a kind of preparation processes and method of microbial liquid organic fertilizer, this method mainly provides a kind of microbial liquid organic fertilizer using straw as raw material, eliminate in feces of livestock and poultry that there may be the situations of harmful substance, using the secondary adding technology of composite bacteria agent, the several functions bacterial strain that antagonism does not occur mutually is combined, two kinds of efficient composite bacteria agents are made to add stage by stage, secondary fermentation is carried out to straw using the synergistic effect between bacterial strain, pass through secondary fermentation technology, not only ensure that straw is degradable and reach innoxious, and effectively strengthen the nutritional ingredient and biological property of microbial liquid organic fertilizer, products obtained therefrom not only contains substantial amounts of organic matter, available nutrient, also contain multiple beneficial microorganism.
Description
Technical field
The invention belongs to agricultural supplie fields, and in particular to a kind of preparation process and method of microbial liquid organic fertilizer.
Background technology
With the adjustment of China's agricultural planting structure, inorganic fertilizer and a large amount of of chemical pesticide apply in agricultural production process
With, cause the physical arrangement of agricultural soil that huge variation has occurred, seriously affected the growth and development of crop, show soil
Hardened serious, the salination acidification phenomenon of earth increasingly increases, and reduces soil fertility, fertilizer conservation water-holding capacity declines, and makes the micro- life of soil
Significant changes have occurred in object fauna, and beneficial microbe is reduced, and harmful microorganism increases, and soil disease sprawling is made so as to affect
The growth of object reduces crop yield and quality.
Pollution-free organic preparation of microbial organic fertilizer is the key that one step of production natural, ecological crops, existing
In the preparation process of microbial organic fertilizer, microbial inoculum purchased in market is disposably directly typically inoculated into feces of livestock and poultry and farming is given up
In gurry, and add the necessary trace element of other plant and synergist.However the disposable inoculating process of microbial inoculum is too simple, nothing
Method ensures that feces of livestock and poultry and agricultural waste are degradable so as to reaching innoxious.In addition, strain it is few and be inoculated with before do not carry out phase
Antagonistic experiment is closed, can not ensure that strain is efficiently acted synergistically.In addition, other chemicals in existing microbial organic fertilizer,
The addition of inorganic salts and oxide not only increases production cost, and last product can not be made to reach full ecological have
Machine, safety non-pollution.Therefore it provides a kind of new, efficient, safe, pure ecological, free of contamination technique for producing organic fertilizer and its
Preparation method has a very important significance.
The content of the invention
It is an object of the invention to provide a kind of preparation process and method of microbial liquid organic fertilizer, this method will pass through
Prevalent variety cultivation and the excellent functional bacterial strain of a variety of characters of antagonistic experiment screening are combined, and efficient composite bacteria agent is made,
Secondary fermentation is carried out to straw using secondary adding technology, ensures that straw is degradable and reaches innoxious, do not add
Other chemicals, inorganic salts and oxide reduce production cost, can also make last product reach full ecological it is organic,
Safety non-pollution.The microbial liquid organic fertilizer produced is not only containing substantial amounts of organic matter, available nutrient, also containing there are many have
Beneficial microorganism.Microbial liquid organic fertilizer provided by the invention can not only improve the physicochemical character of soil, moreover it is possible to improve soil
Fertility promotes the growth of crop, improves crop quality.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of microbial liquid organic fertilizer, raw material form by weight percentage：Straw 15%-30%, beneficial to micro-
Biofermentation composite bacteria agent 0.01%-0.5%, beneficial microbe strengthen composite bacteria agent 0.01%-0.5%, water 30%-90%；
The above components mass percent summation is 100%.
The straw is ripe crops cauline leaf (fringe) part.
The compoiste fermented microbial inoculum of beneficial microbe is straw degradative bacterium, azotobacter, symbiotic nitrogen-fixing bacteria, phosphorus decomposing
Bacterium, potassium solubilizing bacteria and multi-functional bacterial strain mix preparation, composition is by weight percentage：Straw degradative bacterium 20%-40%, growing nitrogen-fixing
Bacterium 10%-20%, symbiotic nitrogen-fixing bacteria 5%-10%, phosphate solubilizing bacteria 5%-20%, potassium solubilizing bacteria 5%-20%, multi-functional bacterial strain 5%-
20%, the above components mass percent summation is 100%..The compoiste fermented microbial inoculum of this beneficial microbe can be in straw one
It is added in secondary fermentation, straw is helped to carry out compost fermentation at normal temperatures 2 to 3 months.
It is azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium solubilizing bacteria and more work(that the beneficial microbe, which strengthens composite bacteria agent,
Energy bacterial strain mix preparation, composition is by by weight percentage：Azotobacter 5%-10%, symbiotic nitrogen-fixing bacteria part 10%-25%,
Phosphate solubilizing bacteria 5%-20%, potassium solubilizing bacteria 5%-20%, multi-functional bacterial strain 5%-20%, the above components mass percent summation are
100%.This beneficial microbe, which strengthens composite bacteria agent, to be added in straw secondary fermentation, heat and persistently lead to while stirring
Oxygen, mixing speed 10-30r/min, system temperature is controlled at 50-70 DEG C, when secondary fermentation 12-24 is small.
The straw degradative bacterium is one or more of Trichoderma atroviride bacterium, bacillus amyloliquefaciens, gray line red streptomyces.
The azotobacter is azotobacter chroococcum, brown azotobacter, quick nitrogen monad, India's Bai Yelin kirschner
One or more of bacterium.
The symbiotic nitrogen-fixing bacteria is one or more of Frankia, rhizobium.
The phosphate solubilizing bacteria is one or more of bacillus megaterium, streptomycete.
The potassium solubilizing bacteria is one or more of colloid bacillus cereus, silicate bacteria.
The multi-functional bacterial strain is in photosynthetic bacteria, lactobacillus acidophilus, saccharomycete, bacillus subtilis, Aspergillus
It is one or more of.
Preparation method comprises the following steps：
(1) one time fermentation：Straw is put into pulverizer and is crushed, it is rear to add in the compoiste fermented microbial inoculum of beneficial microbe,
Compost fermentation is carried out at normal temperatures 2 to 3 months；
(2) secondary fermentation：The one time fermentation product that step (1) is obtained puts into Zymolysis Equipment, sequentially adds water and beneficial
Microorganism strengthens composite bacteria agent, heats while stirring and persistently leads to oxygen, mixing speed 10-30r/min, system temperature control exists
50-70 DEG C, when secondary fermentation 12-24 is small；
(3) separation of solid and liquid：Carried out in the secondary fermentation product input solid-liquid separating machine that step (2) is obtained separation of solid and liquid or
Separation of solid and liquid is carried out using settled process；
(4) liquid is taken after being layered, liquid tinning is packed, obtains microorganism organic liquid fertilizer, remaining solid residue is collected
Raw material as organic solid fertilizer.
Specific embodiment
With specific embodiment, the invention will be further described below, but the present invention is not limited only to this.
Embodiment 1：
Raw material and formula needed for a kind of microbial liquid organic fertilizer：Straw 90kg, beneficial microbe are compoiste fermented
(straw degradative bacterium, azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio by microbial inoculum 0.01kg
4：2：1：1：1：1 mixes), beneficial microbe strengthens composite bacteria agent 0.01kg (azotobacter, symbiotic nitrogen-fixing bacteria, phosphorus decomposing
Bacterium, potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio 1：2：1：1：1 mixes), water 200kg.
A kind of microbial liquid preparation method of organic fertilizer：90kg straws are put into pulverizer and are smashed, rear add in has
The compoiste fermented microbial inoculum 0.01kg of beneficial microorganism is mixed and is carried out compost fermentation at normal temperatures 2 months；Obtained one time fermentation product
Zymolysis Equipment is put into, the water and 0.01kg beneficial microbes for sequentially adding 200kg strengthen composite bacteria agent, heat and hold while stirring
Continuous logical oxygen, mixing speed 10r/min, system temperature is controlled at 50 DEG C, when secondary fermentation 12 is small；Obtained secondary fermentation is produced
Separation of solid and liquid is carried out in object input solid-liquid separating machine；Liquid is taken after layering, liquid tinning is packed, obtains microorganism organic liquid
Fertilizer, remaining solid residue collect the raw material as organic solid fertilizer.
Embodiment 2：
Raw material and formula needed for a kind of microbial liquid organic fertilizer：Straw 105kg, beneficial microbe are compoiste fermented
(straw degradative bacterium, azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio by microbial inoculum 0.1kg
12：6：3：4：4：4 mix), beneficial microbe strengthens composite bacteria agent 0.1kg (azotobacter, symbiotic nitrogen-fixing bacteria, phosphorus decomposing
Bacterium, potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio 3：6：4：4：4 mix), water 250kg.
A kind of microbial liquid preparation method of organic fertilizer：105kg straws are put into pulverizer and are smashed, rear add in has
The compoiste fermented microbial inoculum 0.1kg of beneficial microorganism is mixed and is carried out compost fermentation at normal temperatures 2.5 months；Obtained one time fermentation production
Object puts into Zymolysis Equipment, and the water and 0.1kg beneficial microbes for sequentially adding 250kg strengthen composite bacteria agent, heat while stirring simultaneously
Persistently lead to oxygen, mixing speed 10r/min, system temperature is controlled at 50 DEG C, when secondary fermentation 18 is small；The secondary fermentation that will be obtained
Separation of solid and liquid is carried out in product input solid-liquid separating machine；Liquid is taken after layering, liquid tinning is packed, obtains microorganism organic liquid
Fertilizer, remaining solid residue collect the raw material as organic solid fertilizer.
Embodiment 3：
Raw material and formula needed for a kind of microbial liquid organic fertilizer：Straw 120kg, beneficial microbe are compoiste fermented
(straw degradative bacterium, azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio by microbial inoculum 0.2kg
12：6：3：4：4：4 mix), beneficial microbe strengthens composite bacteria agent 0.2kg (azotobacter, symbiotic nitrogen-fixing bacteria, phosphorus decomposing
Bacterium, potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio 3：6：4：4：4 mix), water 250kg.
A kind of microbial liquid preparation method of organic fertilizer：120kg straws are put into pulverizer and are smashed, rear add in has
The compoiste fermented microbial inoculum 0.2kg of beneficial microorganism is mixed and is carried out compost fermentation at normal temperatures 2.5 months；Obtained one time fermentation production
Object puts into Zymolysis Equipment, and the water and 0.1kg beneficial microbes for sequentially adding 250kg strengthen composite bacteria agent, heat while stirring simultaneously
Persistently lead to oxygen, mixing speed 10r/min, system temperature is controlled at 50 DEG C, when secondary fermentation 18 is small；The secondary fermentation that will be obtained
Separation of solid and liquid is carried out in product input solid-liquid separating machine；Liquid is taken after layering, liquid tinning is packed, obtains microorganism organic liquid
Fertilizer, remaining solid residue collect the raw material as organic solid fertilizer.
Embodiment 4：
Raw material and formula needed for a kind of microbial liquid organic fertilizer：Straw 120kg, beneficial microbe are compoiste fermented
(straw degradative bacterium, azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio 4 by microbial inoculum 0.2kg：
2：1：2：2：2 mix), beneficial microbe strengthen composite bacteria agent 0.2kg (azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria,
Potassium solubilizing bacteria, multi-functional bacterial strain are with mass ratio 2：5：4：4：4 mix), water 300kg.
A kind of microbial liquid preparation method of organic fertilizer：120kg straws are put into pulverizer and are smashed, rear add in has
The compoiste fermented microbial inoculum 0.2kg of beneficial microorganism is mixed and is carried out compost fermentation at normal temperatures 3 months；Obtained one time fermentation product
Zymolysis Equipment is put into, the water and 0.2kg beneficial microbes for sequentially adding 300kg strengthen composite bacteria agent, heat and hold while stirring
Continuous logical oxygen, mixing speed 30r/min, system temperature is controlled at 70 DEG C, when secondary fermentation 24 is small；Obtained secondary fermentation is produced
Separation of solid and liquid is carried out in object input solid-liquid separating machine；Liquid is taken after layering, liquid tinning is packed, obtains microorganism organic liquid
Fertilizer, remaining solid residue collect the raw material as organic solid fertilizer.
Microbial liquid organic fertilizer performance measurement
(1) content of organic matter measures
It measures and is carried out by 5.2 regulations in NY-525-2012.
Analysis result is stated
--- the content of organic matter of fertilizer is represented with the mass fraction of fertilizer, is 1. calculated by formula：
In formula：
The molar concentration of c-calibration standard solution, unit are mole every liter (mol/L)；
V0During-blank test, the volume of quota of expenditure solution, unit is milliliter (ml)；
When V-sample measures, the volume of calibration standard is consumed, unit is milliliter (ml)；
The molal weight of 0.003-a quarter carbon atom, unit are gram every mole (g/mol)；
1.724-it is scaled the coefficient of organic matter by organic carbon；
1.5-oxidation adjusting coefficient；
M-air-drying sample quality, unit are gram (g)；
D-point take multiple, constant volume/point take volume, 250/50.
Note：Acquired results should be represented to two-decimal.
--- the content of organic matter (ρ) is represented with mass concentration (g/L), is 2. calculated as the following formula：
The ω ρ of ρ=100 ②
In formula：
The mass fraction (%) of organic matter in ω-style；
ρ0The density of-liquid style, unit are gram every milliliter (g/mL)；
10-mass fraction is scaled the coefficient of mass concentration.
(2) total nitrogen (N) assay
It measures and is carried out by 5.3 regulations in NY-525-2012.
Analysis result is stated
--- total nitrogen (N) content of fertilizer is represented with the mass fraction of fertilizer, is 3. calculated by formula：
In formula：
The molar concentration of c-calibration standard solution, unit are mole every liter (mol/L)；
V0During-blank test, the volume of quota of expenditure solution, unit is milliliter (ml)；
When V-sample measures, the volume of calibration standard is consumed, unit is milliliter (ml)；
The molal weight of 0.014-nitrogen, unit are gram every mole (g/mol)；
The quality of m-sample, unit are gram (g)；
D-point take multiple, constant volume/point take volume, 100/50.
Note：Acquired results should be represented to two-decimal.
--- total nitrogen content (ρ) is represented with mass concentration (g/L), is 4. calculated as the following formula：
The ω ρ of ρ=100 ④
In formula：
The mass fraction (%) of organic matter in ω-style；
ρ0The density of-liquid style, unit are gram every milliliter (g/mL)；
10-mass fraction is scaled the coefficient of mass concentration.
(3) total phosphorus (P2O5) assay
It measures and is carried out by 5.4 regulations in NY-525-2012.
Analysis result is stated
--- the phosphorus content of fertilizer is represented with the mass fraction of fertilizer, is 5. calculated by formula：
In formula：
c2- by calibration curve difference or by regression equation ball colour developing phosphoric acid concentration, unit is micrograms per millilitre (μ g/
ml)；V3-color volume, 50ml；
D-point take multiple, constant volume/point take volume, 100/5 or 100/10.
M-air-drying sample quality, unit are gram (g)；
2.29-phosphorus (P) is converted into phosphorus pentoxide (P2O5) factor；
0.0001-μ g/g are scaled to the factor of mass fraction；
Note：Acquired results should be represented to two-decimal.
--- total phosphorus (P2O5) content (ρ) represents with mass concentration (g/L), 6. calculated as the following formula：
The ω ρ of ρ=100 ⑥
In formula：
The mass fraction (%) of organic matter in ω-style；
ρ0The density of-liquid style, unit are gram every milliliter (g/mL)；
10-mass fraction is scaled the coefficient of mass concentration.
(4) total potassium (K2O) assay
It measures and is carried out by 5.5 regulations in NY-525-2012.
Analysis result is stated
--- the phosphorus content of fertilizer is represented with the mass fraction of fertilizer, is 7. calculated by formula：
In formula：
c3- by calibration curve difference or by regression equation ball colour developing phosphoric acid concentration, unit is micrograms per millilitre (μ g/
ml)；V4- color volume, 50ml；
D-point take multiple, constant volume/point take volume, 100/5.
The quality of m-sample, unit are gram (g)；
1.20-potassium (K) is converted into phosphorus pentoxide (K2O factor)；
0.0001-μ g/g are scaled to the factor of mass fraction；
Note：Acquired results should be represented to two-decimal.
--- total potassium (K2O) content (ρ) is represented with mass concentration (g/L), is 8. calculated as the following formula：
The ω ρ of ρ=100 ⑧
In formula：
The mass fraction (%) of organic matter in ω-style；
ρ0The density of-liquid style, unit are gram every milliliter (g/mL)；
10-mass fraction is scaled the coefficient of mass concentration.
(5) the test pH pH meters of acid-base value
At room temperature, the liquid organic fertilizer raw material of 50ml is taken with graduated cylinder, pours into the beaker of 100ml, directly uses acidity
PH value determination is counted, as a result retains a decimal.
(6) measure of induced worm egg death rate
It is carried out by the regulation of GB/T 19524.2.
(7) measure of colibacillus of excrement group number
It is carried out by the regulation of GB/T 19524.1.
Microbial liquid organic fertilizer obtained by 1 embodiment 1-4 of table measures comparing result with the organic fertilizer nutrient of market common liq
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification should all belong to the covering scope of the present invention.
Claims (11)
1. a kind of preparation process and method of microbial liquid organic fertilizer, it is characterised in that：Raw material forms by weight percentage：
Straw 15%-30%, the compoiste fermented microbial inoculum 0.01%-0.5% of beneficial microbe, beneficial microbe strengthen composite bacteria agent 0.01%-
0.5%, water 30%-90%；The above components mass percent summation is 100%.
2. microbial liquid organic fertilizer according to claim 1, it is characterised in that：The straw is ripe farming
Object cauline leaf（Fringe）Part.
3. microbial liquid organic fertilizer according to claim 1, it is characterised in that：The beneficial microbe fermenting compound fungus
Agent is that straw degradative bacterium, azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium solubilizing bacteria and multi-functional bacterial strain mix preparation, composition are pressed
Weight percent meter：Straw degradative bacterium 20%-40%, azotobacter 10%-20%, symbiotic nitrogen-fixing bacteria 5%-10%, phosphate solubilizing bacteria 5%-
20%th, potassium solubilizing bacteria 5%-20%, multi-functional bacterial strain 5%-20%, the above components mass percent summation are 100%；This beneficial microbe
Compoiste fermented microbial inoculum can add in straw one time fermentation, and straw is helped to carry out compost fermentation 2 to 3 at normal temperatures
Month.
4. microbial liquid organic fertilizer according to claim 1, it is characterised in that：The beneficial microbe strengthens compound bacteria
Agent is azotobacter, symbiotic nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium solubilizing bacteria and multi-functional bacterial strain mix preparation, and composition is by percentage by weight
Than meter：Azotobacter 5%-10%, symbiotic nitrogen-fixing bacteria part 10%-25%, phosphate solubilizing bacteria 5%-20%, potassium solubilizing bacteria 5%-20%, multi-functional bacterium
Strain 5%-20%, the above components mass percent summation are 100%；This beneficial microbe strengthens composite bacteria agent can be in straw
It is added in secondary fermentation, heat while stirring and persistently leads to oxygen, mixing speed is 10-30 r/min, and system temperature is controlled in 50-
70 DEG C, when secondary fermentation 12-24 is small.
5. straw degradative bacterium according to claim 3, it is characterised in that：The straw degradative bacterium is Trichoderma atroviride bacterium, solution
One or more of bacillus amyloliquefaciens, gray line red streptomyces.
6. according to the azotobacter described in claim 3 and 4, it is characterised in that：The azotobacter for azotobacter chroococcum,
One or more of brown azotobacter, quick nitrogen monad, India Bai Yelin kirschner bacterium.
7. according to the symbiotic nitrogen-fixing bacteria described in claim 3 and 4, it is characterised in that：The symbiotic nitrogen-fixing bacteria is put for Forlan kirschner
One or more of line bacterium, rhizobium.
8. according to the phosphate solubilizing bacteria described in claim 3 and 4, it is characterised in that：The phosphate solubilizing bacteria is bacillus megaterium, streptomycete
One or more of.
9. according to the potassium solubilizing bacteria described in claim 3 and 4, it is characterised in that：The potassium solubilizing bacteria is colloid bacillus cereus, silicate
One or more of bacterium.
10. according to the multi-functional bacterial strain described in claim 3 and 4, it is characterised in that：The multi-functional bacterial strain for photosynthetic bacteria,
One or more of lactobacillus acidophilus, saccharomycete, bacillus subtilis, Aspergillus.
A kind of 11. method for preparing microbial liquid organic fertilizer as described in claim 1, it is characterised in that：Including following step
Suddenly：
（1）One time fermentation：Straw is put into pulverizer and is crushed, it is rear to add in the compoiste fermented microbial inoculum of beneficial microbe, normal
Temperature is lower to carry out compost fermentation 2 to 3 months；
（2）Secondary fermentation：By step（1）Obtained one time fermentation product input Zymolysis Equipment, sequentially adds water and beneficial to micro- life
Object strengthens composite bacteria agent, heats while stirring and persistently leads to oxygen, mixing speed is 10-30 r/min, and system temperature is controlled in 50-
70 DEG C, when secondary fermentation 12-24 is small；
（3）Separation of solid and liquid：By step（2）Separation of solid and liquid or use are carried out in obtained secondary fermentation product input solid-liquid separating machine
Settled process carries out separation of solid and liquid；
（4）Liquid is taken after layering, liquid tinning is packed, obtains microorganism organic liquid fertilizer, remaining solid residue collects conduct
The raw material of organic solid fertilizer.
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| CN111704488A (en) * | 2020-06-23 | 2020-09-25 | 方瑞庭 | Two-stage fermentation liquid fertilizer and preparation method thereof |
| CN111704488B (en) * | 2020-06-23 | 2022-05-03 | 方瑞庭 | Two-stage fermentation liquid fertilizer and preparation method thereof |
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