CN103964942A - Method for production of organic fertilizer by utilizing pig manure - Google Patents
Method for production of organic fertilizer by utilizing pig manure Download PDFInfo
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- CN103964942A CN103964942A CN201410144462.0A CN201410144462A CN103964942A CN 103964942 A CN103964942 A CN 103964942A CN 201410144462 A CN201410144462 A CN 201410144462A CN 103964942 A CN103964942 A CN 103964942A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for production of an organic fertilizer by utilizing pig manure. The method comprises the following steps: A, pretreatment of raw material: the pig manure is used as raw material, the carbon-nitrogen ratio is adjusted to 28, the moisture content of the raw material is reduced to 60 percent, and EM strains are added; B, compost fermentation: compost fermentation is performed by adopting an aerobiotic windrow type composting technology; C, postprocessing of compost products: the moisture is reduced to be below 30 percent, particles can pass through a sieve with 60 mesh, and microelements or functional microorganisms are add for adjustment; D, packaging and storing of finished products. The organic fertilizer produced with the method is excellent in product quality, and is in strict conformance with the national standards and industrial standards of the commercial organic fertilizer: the organic content is not less than 45 percent, the total nutrient content is not less than 5 percent, the moisture content is not greater than 30 percent, and the pH value is 5.5-8.5; the death rate of ova of roundworms is not less than 98 percent, and the number of manure coli-group is not greater than 50 unit/g; in the produced organic fertilizer, in per kilogram of dry matters, the heavy metal content standards of the product are as follows: As is not greater than 30, Hg is not greater than 5, Pb is not greater than 100, Cd is not greater than 3 and Cr is not greater than 300.
Description
Technical field:
The present invention relates to a kind of production method of fertilizer, particularly relate to a kind of method of utilizing pig manure to produce fertilizer, belong to fertilizer deep process technology field.
Background technology:
Along with the development of livestock industry, the quick increase in large scale of pig farm field and the district of raising pigs, a large amount of pig manure processing of consequent problem becomes a great problem of livestock industry.Be mainly ecological utilization in the past, and by pig manure direct returning to farmland, along with the development of biofermentation technique, utilized producing bioorganic fertilizer from pig manure to become a new measure.Utilize pig manure to produce fertilizer and not only solved a large amount of pig manures accumulation pollution on the environments, also for the development of green organic agricultural provides necessary fertilizer.But pig manure Natural compost is produced fertilizer, not only the cycle is long but also unreasonable due to its carbon-nitrogen ratio, causes a large amount of nutrients loss of volatilize in composting process, and the while is also caused atmospheric pollution.
Summary of the invention:
Technical problem to be solved by this invention is: overcome the deficiencies in the prior art, a kind of method of utilizing pig manure to produce fertilizer is provided, rational carbon-nitrogen ratio is not only provided, and can have reduced the nutrient loss of pig manure slaking, reduce atmospheric pollution.
The technical scheme that the present invention takes for technical solution problem is:
Utilize pig manure to produce a method for fertilizer, comprise raw materials pretreatment, compost fermentation, composting production aftertreatment and finished product packing warehouse-in, its concrete production craft step is as follows:
A, raw materials pretreatment:
1. raw material sources: the pig manure that Swine Production produces is as raw material;
2. adjust carbon-nitrogen ratio: carry out the adjusting of carbon-nitrogen ratio using cavings as auxiliary material, making C/N ratio is 28;
3. regulate moisture content: add appropriate plant ash, in the situation that not affecting carbon-nitrogen ratio, raw material water ratio is dropped to 60%;
4. add EM bacterial classification: the weight ratio of bacterial classification and pig manure raw material is 1:7000～9000;
B, compost fermentation: adopt aerobic buttress formula composting process to carry out compost fermentation:
1. according to place needs, bar buttress width is 1.2～2.2 meters, is highly 1.0～2.0 meters, and length is not limit, and in the time that bar is piled, material successively evenly need to be stacked;
2. oxygen supply control: adopt mechanical turning mode to carry out oxygenation, turning once every three days;
3. temperature control: optimum fermentation temp, 55 DEG C of left and right, detects in real time, once temperature exceedes set(ting)value, turning in time;
4. in the fertilizer conservation of the becoming thoroughly decomposed stage: after compost maturity, volume-diminished, makes to pile temperature and drop to 5 DEG C of left and right of a little higher than temperature, compress heap body to make organic composition under anaerobic condition, prevents mineral, is beneficial to the preservation of fertility;
C, composting production aftertreatment:
1. compost work in-process are through rotten degree detection, quality examination, safety detection, enter further manufacturing procedure after reaching requirement;
2. moisture regulates: adopt the methods such as natural air drying, airing that moisture is reduced to below 30%;
3. fertilizer is pulverized and screening: the granularity after pulverizing can be passed through 60 mesh sieves;
4. trace element is adjusted: the demand for Different Crop is carried out micro-adjustment, reaches the normal growth demand of crop;
5. add functional microbial: add different functional microbials according to Different Crop and the market requirement, make the microbial fertilizer that contains biological activity and have specific fertilizer effect;
6. to be tested after mix and blend etc.;
D, finished product packing warehouse-in:
The qualified rear metering packing warehouse-in of the examination and test of products; The underproof composting production last handling process that returns re-starts processing.
In the fertilizer of producing: organic content >=45%, total nutrient content >=5%, moisture content≤30%, pH value is 5.5～8.5; Induced worm egg death rate >=98%, colibacillus of excrement group number≤50/g.
Described organic content is the massfraction of baking substrate; Described total nutrient is the total mass mark of full nitrogen in baking substrate, Vanadium Pentoxide in FLAKES, potassium oxide.
In the fertilizer of producing, in every kilogram of dry-matter, product heavy metal content standard is: arsenic As≤30, mercury Hg≤5, plumbous Pb≤100, cadmium Cd≤3, chromium Cr≤300.
Positive beneficial effect of the present invention is as follows:
1, the carbon-nitrogen ratio of pig manure is made as 28:
In composting process of the present invention, carbon element is the basic energy derive of compost microbe, is also the basic material that microorganism cells forms.Compost microbe, in decomposing carbonaceous organic material, utilizes part nitrogen to build self cell paste, and nitrogen still forms the important component part of protein in cell, nucleic acid, amino acid, enzyme, coenzyme.Reasonably carbon-nitrogen ratio is the prerequisite of highly effective compost fermentation.C/N is too high, and microorganism growth is bred required sources of nitrogen and is restricted, and microbial reproduction speed is low, and organic substance decomposing speed is slow, and fermentation time is long; Organic raw material loss is large, and humification coefficient is low; And can cause composting production C/N too high, after being manured into soil, easily cause nitrogen starved plot, thereby affect crop growth.C/N is than too low, and microorganism growth is bred required energy derive and is restricted, and leavening temperature rises slowly, and nitrogen is excessive and discharge with the form of ammonia, and organonitrogen loss is large, also can distribute niff.Rationally regulate the carbon-nitrogen ratio in composting material, to accelerate compost maturity, improve the effective way of humification coefficient, through long-term actual production and the research experience of contriver, C/N ratio to pig manure is made as 28, utilizes less expensive and organic content is high, the cavings of high adsorption capacity carries out carbon-nitrogen ratio adjusting for auxiliary material.
2, raw material water ratio is dropped to 60%:
In composting process, keeping suitable moisture content, is the most important condition that compost is successful.Because microorganism mostly lacks water conservation mechanism, so very responsive to moisture, in the time that moisture content is between 35%～40%, the degradation rate of compost microbe can significantly decline, but moisture is while dropping to below 30%, and degradation process can stop completely.Conventionally expansion deliquescing after organism water suction, is conducive to microorganism and decomposes; When moisture moves in compost, institute's carrier also can move and spread to surrounding, and creates conditions for the breeding of microorganism.Very little, microbial activities is restricted moisture, affects compost speed; Moisture is too many, can stop up space between compost material, affects its permeability, easily forms anaerobic status, and produces foul smell, and nutrient loss is large, and compost is slow too.Keep suitable moisture and porosity is the important means of balance composting process for this reason.Ensure enough biologically stablies, must have suff water content, but can not the high state to cause the decline of oxygen transmission amount due to the pore volume minimizing of freely ventilate, and then reduction biological activity.In composting process, different raw materials has the different optimum moisture upper limits, and is determined by particle diameter and the structural performance of these raw materials.For keeping higher fermentation efficiency, contriver is according to a large amount of practical production experience, in conjunction with particle diameter and the structural performance of pig manure, obtain being limited to 60% in optimum moisture content of raw material fermentation, by adding appropriate plant ash in the situation that not affecting C/N, raw material water ratio is dropped to 60% left and right, for efficient compost fermentation is laid a good foundation.
3, add appropriate EM microbial inoculum:
The present invention has added the EM mix bacterium agent of Japanese production in composting material, has improved fermentation efficiency, has shortened fermentation time, has reduced the loss of nutritive element, makes quality product higher, more stable.
4, fermentation primary process of the present invention:
Composting fermentation process of the present invention is divided into 4 stages:
1. the temperature rise period: this process refers generally to the initial stage of composting process, in this stage, compost temperature progressively rises to 45 DEG C of left and right from envrionment temperature, leading microorganism is to have a liking for warm nature microorganism as main, comprise bacterium, fungi and actinomycetes, decompose substrate taking carbohydrate and starch as main, can find during this time the sporophore of fungi, also have animal and protozoon to participate in decomposing.
2. hot stage: heap temperature rise to 45 DEG C enters hot stage above, at this one-phase, has a liking for warm microorganism and is suppressed even death, and thermophilic microorganism rises to leading microorganism.The soluble organic matter with newly-generated residual in compost continues oxidized decomposition, and complicated organism also starts strongly to be decomposed as hemicellulose-Mierocrystalline cellulose and protein.The activity of microorganism alternately occurs, conventionally most active in the time of 50 DEG C of left and right is thermophilic fungi and actinomycetes, when temperature rise to 60 DEG C, fungi is almost stopped action completely, only there are thermophilic bacteria and actinomycetes activity, when temperature is raised to 70 DEG C, most of thermophilic microorganisms no longer adapt to, and roll into dormancy and dead stage.The present invention adopts modern explained hereafter fertilizer, and optimum fermentation temp is 55 DEG C of left and right, and most of microbe is the easiest the most active decomposing organic matter in this temperature range, and pathogenic bacteria and parasite great majority can be killed at this temperature.
3. temperature-fall period: hot stage must cause death and movable minimizing of microorganism, naturally enters low thermophase.At this one-phase, have a liking for warm nature microorganism and start again to occupy advantage, the organism of the more difficult decomposition of remnants is done further to decompose, but microorganism active generally declines, heap body thermal value reduces, and temperature starts to decline, tending towards stability of organism, oxygen requirement greatly reduces, and compost enters and becomes thoroughly decomposed or the after-ripening stage.
4. in the fertilizer conservation of the becoming thoroughly decomposed stage: now organism major part has been decomposed and stablized, temperature declines, and in order to keep established soil ulmin and micro-nitrogen, phosphorus, potash fertilizer etc., make the fertilizer becoming thoroughly decomposed keep balance.After compost maturity, volume-diminished, makes to pile temperature and drops to 5 DEG C of left and right of a little higher than temperature, and heap body is compressed and makes organic composition under anaerobic condition, prevents mineral, is beneficial to the preservation of fertility.
5, the control of fermenting process:
1. oxygen supply control: what the present invention adopted is aerobic formula zymotechnique, for keeping efficiently carrying out of fermentation, must ensure windrow to carry out sufficient oxygen supply.The general unlikely naturally osmotic by air of industrialization compost meets compost Biochemical and reacts the needs to oxygen, must take corresponding auxiliary oxygenation measure, and what the present invention adopted is that mechanical turning mode is carried out oxygenation.Bar buttress formula compost is large owing to piling body and air contact surface, generally just can meet the needs of its oxygen supply by turning.The frequency of turning changes in conjunction with material properties and heap temperature, determines turning every three days once.
2. temperature control: the temperature variation of compost is the index whether reflection fermentation is normal the most directly, the most responsive.The requirement of the temperature variation to compost is: temperature rise in early stage steadily, mid-term high temperature maintain appropriateness, latter temperature declines slowly.The present invention mainly regulates and controls the temperature of fermentation by mechanical turning, follow the principle in " time to isothermal not, temperature to not etc. time ", at compost in earlier stage, even if fermented, temperature does not slowly even play temperature, and after 48 hours, also necessary turning, avoids piling body and form anaerobic environment, in the compost middle and later periods, once temperature exceedes set(ting)value, in time turning, can not wait and reach turning again after setting-up time.
6, composting production aftertreatment: compost work in-process enter follow-up further processing and packing stage after rotten degree detection, quality examination, safety detection:
1. moisture regulates: the product water ratio of compost maturity is still very high, needs to reduce below moisture to 30% to carry out follow-up processing again, and what the present invention adopted is the method such as natural air drying, airing.
2. pulverize and sieve: the windrow becoming thoroughly decomposed is pulverized and sieved, can pass through the granularity of 60 mesh sieves to remove mechanical impurity and fertilizer is formed, be more conducive to absorbing of farm crop.
3. add middle trace element: although the fertilizer nutritive element that the present invention produces is very complete, but Partial Elements content is lower than the normal growth demand of crop, need to survey after soil formula for various crops according to different plant growth demands and specially, the middle trace element that adds various water-soluble or chelating states is as sulphur, iron, zinc, magnesium, calcium, boron, manganese, molybdenum, chlorine etc., ensures the normal growth of crop and can improve the interior exterior quality of crop product and increase the resistance of crop.
4. add functional microbial: add different functional microbials as vinelandii, phosphate solubilizing bacteria, silicate bacteria, photosynthetic bacterium, genus bacillus, antibiotic bacteria, VA mycorrhizal fungi, rhizosphere growth-promoting endophytic bacteria and complex microorganism etc. according to Different Crop and the market requirement, to be prepared into the microbial fertilizer that contains biological activity and have specific fertilizer effect, to adapt to the demand of all kinds of farm crop.
7, the fertilizer that the present invention produces, quality product excellence, in strict conformity with national standard and the industry standard of the beneficiating ingredient content of organic commercial fertilizer, innoxious safety, objectionable impurities threshold limit values.In the fertilizer of producing: organic content >=45%, total nutrient content >=5%, moisture content≤30%, pH value is 5.5～8.5; Induced worm egg death rate >=98%, colibacillus of excrement group number≤50/g; In the fertilizer of producing, in every kilogram of dry-matter, product heavy metal content standard is: arsenic As≤30, mercury Hg≤5, plumbous Pb≤100, cadmium Cd≤3, chromium Cr≤300.
Embodiment:
Embodiment: a kind of method of utilizing pig manure to produce fertilizer, comprise raw materials pretreatment, compost fermentation, composting production aftertreatment and finished product packing warehouse-in, its concrete production craft step is as follows:
A, raw materials pretreatment:
1. raw material sources: the pig manure that Swine Production produces is as raw material;
2. adjust carbon-nitrogen ratio: carry out the adjusting of carbon-nitrogen ratio using cavings as auxiliary material, making C/N ratio is 28;
3. regulate moisture content: add appropriate plant ash, in the situation that not affecting carbon-nitrogen ratio, raw material water ratio is dropped to 60%;
4. add EM bacterial classification: the weight ratio of bacterial classification and pig manure raw material is 1:7000～9000;
B, compost fermentation: adopt aerobic buttress formula composting process to carry out compost fermentation:
1. according to place needs, bar buttress width is 1.2～2.2 meters, is highly 1.0～2.0 meters, and length is not limit, and in the time that bar is piled, material successively evenly need to be stacked;
2. oxygen supply control: adopt mechanical turning mode to carry out oxygenation, turning once every three days;
3. temperature control: optimum fermentation temp, 55 DEG C of left and right, detects in real time, once temperature exceedes set(ting)value, turning in time;
4. in the fertilizer conservation of the becoming thoroughly decomposed stage: after compost maturity, volume-diminished, makes to pile temperature and drop to 5 DEG C of left and right of a little higher than temperature, compress heap body to make organic composition under anaerobic condition, prevents mineral, is beneficial to the preservation of fertility;
C, composting production aftertreatment:
1. compost work in-process are through rotten degree detection, quality examination, safety detection, enter further manufacturing procedure after reaching requirement;
2. moisture regulates: adopt the methods such as natural air drying, airing that moisture is reduced to below 30%;
3. fertilizer is pulverized and screening: the granularity after pulverizing can be passed through 60 mesh sieves;
4. trace element is adjusted: the demand for Different Crop is carried out micro-adjustment, reaches the normal growth demand of crop;
5. add functional microbial: add different functional microbials according to Different Crop and the market requirement, make the microbial fertilizer that contains biological activity and have specific fertilizer effect;
6. to be tested after mix and blend etc.;
D, finished product packing warehouse-in:
The qualified rear metering packing warehouse-in of the examination and test of products; The underproof composting production last handling process that returns re-starts processing.
In the fertilizer of producing: organic content >=45%, total nutrient content >=5%, moisture content≤30%, pH value is 5.5～8.5; Induced worm egg death rate >=98%, colibacillus of excrement group number≤50/g.Wherein: the massfraction that organic content is baking substrate; Described total nutrient is the total mass mark of full nitrogen in baking substrate, Vanadium Pentoxide in FLAKES, potassium oxide.
In the fertilizer of producing, in every kilogram of dry-matter, product heavy metal content standard is: arsenic As≤30, mercury Hg≤5, plumbous Pb≤100, cadmium Cd≤3, chromium Cr≤300.
Claims (4)
1. utilize pig manure to produce a method for fertilizer, comprise raw materials pretreatment, compost fermentation, composting production aftertreatment and finished product packing warehouse-in, its concrete production craft step is as follows:
A, raw materials pretreatment:
1. raw material sources: the pig manure that Swine Production produces is as raw material;
2. adjust carbon-nitrogen ratio: carry out the adjusting of carbon-nitrogen ratio using cavings as auxiliary material, making C/N ratio is 28;
3. regulate moisture content: add appropriate plant ash, in the situation that not affecting carbon-nitrogen ratio, raw material water ratio is dropped to 60%;
4. add EM bacterial classification: the weight ratio of bacterial classification and pig manure raw material is 1:7000～9000;
B, compost fermentation: adopt aerobic buttress formula composting process to carry out compost fermentation:
1. according to place needs, bar buttress width is 1.2～2.2 meters, is highly 1.0～2.0 meters, and length is not limit, and in the time that bar is piled, material successively evenly need to be stacked;
2. oxygen supply control: adopt mechanical turning mode to carry out oxygenation, turning once every three days;
3. temperature control: optimum fermentation temp, 55 DEG C of left and right, detects in real time, once temperature exceedes set(ting)value, turning in time;
4. in the fertilizer conservation of the becoming thoroughly decomposed stage: after compost maturity, volume-diminished, makes to pile temperature and drop to 5 DEG C of left and right of a little higher than temperature, compress heap body to make organic composition under anaerobic condition, prevents mineral, is beneficial to the preservation of fertility;
C, composting production aftertreatment:
1. compost work in-process are through rotten degree detection, quality examination, safety detection, enter further manufacturing procedure after reaching requirement;
2. moisture regulates: adopt the methods such as natural air drying, airing that moisture is reduced to below 30%;
3. fertilizer is pulverized and screening: the granularity after pulverizing can be passed through 60 mesh sieves;
4. trace element is adjusted: the demand for Different Crop is carried out micro-adjustment, reaches the normal growth demand of crop;
5. add functional microbial: add different functional microbials according to Different Crop and the market requirement, make the microbial fertilizer that contains biological activity and have specific fertilizer effect;
6. to be tested after mix and blend etc.;
D, finished product packing warehouse-in:
The qualified rear metering packing warehouse-in of the examination and test of products; The underproof composting production last handling process that returns re-starts processing.
2. a kind of method of utilizing pig manure to produce fertilizer according to claim 1, is characterized in that: in the fertilizer of producing: organic content >=45%, total nutrient content >=5%, moisture content≤30%, and pH value is 5.5～8.5; Induced worm egg death rate >=98%, colibacillus of excrement group number≤50/g.
3. a kind of method of utilizing pig manure to produce fertilizer according to claim 2, is characterized in that:
Described organic content is the massfraction of baking substrate; Described total nutrient is the total mass mark of full nitrogen in baking substrate, Vanadium Pentoxide in FLAKES, potassium oxide.
4. a kind of method of utilizing pig manure to produce fertilizer according to claim 1, it is characterized in that: in the fertilizer of producing, in every kilogram of dry-matter, product heavy metal content standard is: arsenic As≤30, mercury Hg≤5, plumbous Pb≤100, cadmium Cd≤3, chromium Cr≤300.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104211456A (en) * | 2014-08-26 | 2014-12-17 | 巫溪县明申肥业有限公司 | Method for fermenting organic fertilizer basic material |
| CN104355823A (en) * | 2014-11-04 | 2015-02-18 | 哈尔滨市海江科技开发有限公司 | Compound organic fertilizer for foliage type potted plant and preparation method of fertilizer |
| CN104529580A (en) * | 2014-12-24 | 2015-04-22 | 广西力源宝科技有限公司 | Method for producing well-composted organic raw materials by using livestock and poultry excrement |
| CN105732142A (en) * | 2014-12-11 | 2016-07-06 | 广西大学 | Method for producing organic fertilizer by using cow dung |
| CN106336251A (en) * | 2016-08-29 | 2017-01-18 | 山东鑫基牧业有限公司 | Method for making bio-organic fertilizer with fermentation of livestock and poultry excrement |
| CN106518466A (en) * | 2016-12-09 | 2017-03-22 | 重庆市潼南区五桂有机肥有限公司 | Method for preparing organic fertilizer |
| CN106747737A (en) * | 2017-01-24 | 2017-05-31 | 贵州省武陵山药用植物白芨开发有限公司 | A kind of special organic bio-fertilizer of the bletilla striata and its preparation technology |
| CN107311744A (en) * | 2017-06-26 | 2017-11-03 | 贵州省铜仁市万山区京军生态农牧发展有限公司 | A kind of method that utilization pig manure produces organic fertilizer |
| CN108424186A (en) * | 2018-05-18 | 2018-08-21 | 中国科学院亚热带农业生态研究所 | A kind of method and apparatus of the continuous oxygenation hot fermentation organic fertilizer of pig manure |
| CN108911805A (en) * | 2018-06-28 | 2018-11-30 | 普定县真源农业开发有限公司 | A method of fertilized the soil using pig farm pig manure |
| CN109384621A (en) * | 2017-08-10 | 2019-02-26 | 连云港市连威农牧科技有限公司 | A method of organic fertilizer is produced using pig manure |
| CN110386833A (en) * | 2018-04-23 | 2019-10-29 | 惠州市返原生物科技有限公司 | Efficient You Ji Fei Fermentation fermenting process |
| CN111995447A (en) * | 2020-08-28 | 2020-11-27 | 中国科学院东北地理与农业生态研究所 | Preparation method of organic fertilizer with high effective phosphorus content |
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| CN104211456A (en) * | 2014-08-26 | 2014-12-17 | 巫溪县明申肥业有限公司 | Method for fermenting organic fertilizer basic material |
| CN104355823A (en) * | 2014-11-04 | 2015-02-18 | 哈尔滨市海江科技开发有限公司 | Compound organic fertilizer for foliage type potted plant and preparation method of fertilizer |
| CN105732142A (en) * | 2014-12-11 | 2016-07-06 | 广西大学 | Method for producing organic fertilizer by using cow dung |
| CN104529580A (en) * | 2014-12-24 | 2015-04-22 | 广西力源宝科技有限公司 | Method for producing well-composted organic raw materials by using livestock and poultry excrement |
| CN106336251A (en) * | 2016-08-29 | 2017-01-18 | 山东鑫基牧业有限公司 | Method for making bio-organic fertilizer with fermentation of livestock and poultry excrement |
| CN106518466A (en) * | 2016-12-09 | 2017-03-22 | 重庆市潼南区五桂有机肥有限公司 | Method for preparing organic fertilizer |
| CN106747737A (en) * | 2017-01-24 | 2017-05-31 | 贵州省武陵山药用植物白芨开发有限公司 | A kind of special organic bio-fertilizer of the bletilla striata and its preparation technology |
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| CN108911805A (en) * | 2018-06-28 | 2018-11-30 | 普定县真源农业开发有限公司 | A method of fertilized the soil using pig farm pig manure |
| CN111995447A (en) * | 2020-08-28 | 2020-11-27 | 中国科学院东北地理与农业生态研究所 | Preparation method of organic fertilizer with high effective phosphorus content |
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Application publication date: 20140806 |