CN101007746A - Process for preparing anti-second-stubble efficient biologic-organic fertilizer - Google Patents
Process for preparing anti-second-stubble efficient biologic-organic fertilizer Download PDFInfo
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- CN101007746A CN101007746A CNA2007100193288A CN200710019328A CN101007746A CN 101007746 A CN101007746 A CN 101007746A CN A2007100193288 A CNA2007100193288 A CN A2007100193288A CN 200710019328 A CN200710019328 A CN 200710019328A CN 101007746 A CN101007746 A CN 101007746A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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Abstract
The invention discloses a preparing method of anti-heavy stubble highly effective biological organic fertilizer including effective of fertilizer, effective of medicine and unwanted bacterium of inhibiting soil, which comprises the following steps: mixing domestic animal manure zymosis agent, chemical mixing fertilizer and alta-mud in proportions; grinding; getting composite fertilizer; spraying bacterium agent on the surface of composite fertilizer; adding microbiological bacterium agent; mixing; dewatering; pelleting.
Description
Technical field
The present invention relates to that a kind of to collect the harmful bacterium of fertilizer efficiency, drug effect and inhibition soil be the highly effective biological organic fertilizer of one.
Background technology
After deliberation, continuous cropping causes the major cause of the underproduction to comprise four aspects: the increase year by year of (1) disease and pest.For example the sickness rate of the damping-off of solanberry class, root rot, eqpidemic disease and watermelon blight etc. is exponential growth with the continuous cropping time limit, and the continuous cropping time limit is long more, and the harm that causes is heavy more; (2) the soil nutrient equilibrated destroys.The nutritive ingredient of crop preference reduces year by year with continuous cropping, but the then increase year by year with continuous cropping of the unwanted composition of crop causes doing a series of physiological disease of deposits yields (as nutritional deficiency disease, toxinosis etc.); (3) crop from malicious phenomenon.Be the restraining effect of the chemical substances such as organic acid, aldehyde, phenol and hydro carbons that in decomposition course, produced of the residual body of preceding crop to the growth of second stubble crop; (4) change of soil physico-chemical property.Because the continuous cropping farming, mode relative fixed such as fertilising, irrigation cause soil fertility to reduce, and the toxic substance accumulation is serious, and organic matter decomposition is slow, beneficial microorganism population structure and quantity minimizing etc.Owing to the change of cropping system and the large scale application of high-yield culturing measure, the underproduction problem of continuous cropping crop shows especially again, needs to be resolved hurrily in recent years.
Commonly used at present has: pharmacy disinfection method, high-temperature sterilization method, soil replacement method, tank farming and grafting etc.The pharmacy disinfection method is divided pharmacy fumigation method and sterilant facture again.The former adopts monobromethane or trichloronitromethane every two years to sterilize once, and its advantage is effectively to kill various soil-borne disease bacterium, the insect that causes because of continuous cropping, and shortcoming is that medicament toxicity is too big, and environmental pollution is serious.The latter adopts at plantation forward direction soil and sprays a large amount of methods such as broad spectrum chemical bactericides such as derosal, the generation and the harm of control continuous cropping disease, its advantage is that protection effect is better, but shortcoming is also to have killed many useful soil microorganismss when killing harmful germ, cause soil microbial community unbalance, causing more sometimes, severe diseases takes place.The high-temperature sterilization method is the generation that the way of employing membrane covering raising ground temperature (40～50 ℃, 15 days) is prevented and treated germ and insect, compares with the pharmacy disinfection method, and prevention effect is very limited.Soil replacement method is that protection ground utilization artificial, the mechanical method of continuous cropping about 2 years scooped away topsoil soils (more than the dark 20cm), then from the place away from the continuous cropping plot, selects the soil of high-quality, fertile, no germ, no subterranean pest-insect to carry out soil removal and replacement.Not only workload is big, labour intensity height, and expense height, and it is not thorough to deal with problems, and gets half the result with twice the effort often.Tank farming is used in some areas, but facility condition of having relatively high expectations and fund input, the large scale application difficulty is very big.Grafting can both adopt by not all crop.Stock kind and intervarietal grafting difference on effect are very big, and cucurbit anvil and bottle gourd anvil and watermelon graft compatibility are better, Graft surviving rate height.
To sum up, the method medicament toxicity that solves the continuous cropping disease at present is big, environmental pollution causes structure and the function that soil microbial community is unbalance, destroy soil microbial community seriously, easily, change the physico-chemical property of soil, and can reduce the quality of agricultural-food, harm humans health.
Summary of the invention
The object of the invention be to invent the anti-continuous cropping disease of a kind of energy, toxicity little, pollution-free, do not influence the preparation method that soil microbial community is unbalance, do not destroy the efficient biologic-organic fertilizer of soil microbial community structure and function.
The present invention includes following steps:
(1) prepare feces of livestock and poultry starter, chemical mixing fertilizer, microbial inoculum, microbiobacterial agent respectively:
To contain 90% and reach above feces of livestock and poultry fermentation at high temperature, deodorizing, sterilization, through dehydration, drying, make the feces of livestock and poultry starter then.
Urea, secondary calcium phosphate and Repone K are pressed mass ratio 30～40: 35～45: 15～25 mix, and make chemical mixing fertilizer.
High-efficiency nitrogen-fixing bacterium bacterium liquid, phosphate solubilizing bacteria bacterium liquid, potassium solubilizing bacteria bacterium liquid, economic benefits and social benefits actinomycetes bacterium liquid add 50g～100g dextrin after mixing by 15～25: 25～35: 15～25: 20～30 volume ratio again in every 1000mL mixed bacteria liquid, make microbial inoculum.
Genus bacillus, blown-ball Azotobacter, bacillus cereus, bacillus megaterium, bacillusmusilaginosiengineering are pressed 16～22: 15～30: 10～20: 18～35: 8～15 volume ratio is made microbiobacterial agent for mixing.
(2) feces of livestock and poultry starter, chemical mixing fertilizer and wilkinite are pressed mass ratio 55～65: mix, pulverize at 25～35: 5～10, makes compound manure;
(3) earlier microbial inoculum is sprayed at the compound manure surface, adds microbiobacterial agent again, mix, then dehydration, granulation; Feed ratio 0.6ml～the 0.8ml of described microbial inoculum, compound manure and microbiobacterial agent: 100g: 1ml～2ml.
Product of the present invention adopts the compounded strain powder of " three bacterium " (vinelandii, phosphate solubilizing bacteria, potassium solubilizing bacteria) in the microorganism, overcome the microbial inoculum of continuous crop obstacle efficient biologic-organic fertilizer as manufacturing, utilizing town and country organic waste, fowl domestic animals excrement etc., after sterilising treatment,, form fertilizer, microorganism fertilizer, inorganic fertilizer three fertile compound fertilizer as matrix.This product had both had quick-acting, the high nutrient characteristics of chemical fertilizer, the characteristic of having the gentle, long-acting, nontoxic of fertilizer and bio-fertilizer again and improving the soil, be a kind of lower than traditional agricultural fertilizer cost, fertilizer efficiency good, volume increase is high, residually lack, the product while of fine quality can be suppressed Soil degradation again, the structure of improving the soil, multiple functional high-performance fertilizer of new generation.The harmful bacterium of collection fertilizer efficiency, drug effect and inhibition soil is an one, have nontoxic, harmless, high nutrient, advantage of high activity, also have and improve the soil, promote plant root system development, strengthen the immunologic function of crop, have diseases prevention, disease-resistant characteristics, to increase crop yield, to improve the crop quality effect very remarkable.Can be widely used in all kinds of farm crop, fruit tree, vegetables, tobacco, tealeaves, flowers and lawn etc., can solve the problem that continuous cropping causes the underproduction preferably, and production cost be low.
Products characteristics of the present invention:
1, multi-purpose core microorganism.This project has formed the core biological flora of this product by the optimum combination to a series of antibiontses.After these biological floras are manured into soil, certainly will form the microbial ecological circle of an absolute predominance at plant rhizosphere, influence the growth of plant directly or indirectly.At first by ecological niche competition or secretion secondary metabolite, these core biological floras can effectively suppress the growth of phytopathogen, reduce Plant diseases.Secondly, microorganism is the important decomposer of soil organic substance, and a large amount of beneficial microorganisms apply, and will improve the mineralization of soil, help the plant absorbing utilization.The 3rd, the applying of a large amount of beneficial organism floras, can also effectively alleviate the continuous cropping plantation from malicious phenomenon.
2, product is safe in utilization: the biological flora of this product and auxiliary material all derive from nature, are released to nature, are complete non-harmful green products, and environmental friendliness is to the human body toxicological harmless.
3, suitability is wide: this product can improve the soil, improve utilization rate of fertilizer, reduce the chemical fertilizer usage quantity, crop had nutrition, conditioning and health-care effect, not only continuous cropping plantation crop had unique effect, and be applicable to the crop of all non-continuous cropping plantations, applied range, market potential is huge.
The bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the high-efficiency nitrogen-fixing bacterium bacterium liquid of the present invention.
The bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the phosphate solubilizing bacteria bacterium liquid of the present invention.
The bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the potassium solubilizing bacteria bacterium liquid of the present invention.
The bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the economic benefits and social benefits actinomycetes liquid of the present invention.
Select the bacterium number in above each bacterium bacterium liquid, purpose is: test in bacterium liquid by the physiologically active to bacterium, select this bacterium number to reach the product standard requirement.
In order to be beneficial to mixing, granulation and easily dissolving, the present invention is when the preparation compound manure, and the powder particle diameter of feces of livestock and poultry starter, chemical mixing fertilizer is respectively 150～200 orders.
In the step 3), the speed of mainshaft be 20～30r/min, rotating disk inclination angle be dewater on 45～55 ° the granulating disc, granulation.Selecting the speed of mainshaft for use is that 20～30r/min, rotating disk inclination angle are 45～55 °, and purpose is: be beneficial to the balling-up granulation, shorten the balling-up time, to reduce the mortality ratio of bacterium when dehydration and the granulation.
For the ease of storage, transportation, and be beneficial to and use, among the present invention, also the work in-process after the granulation being dried to water content through 40～60 ℃ earlier is 10%～30%.
Embodiment
1, preparation microbial inoculum:
Choose high-efficiency nitrogen-fixing bacterium bacterium liquid, phosphate solubilizing bacteria bacterium liquid, potassium solubilizing bacteria bacterium liquid, economic benefits and social benefits actinomycetes liquid that the bacterium number is respectively 3.5 * 108/milliliter～6.2 * 108/milliliter respectively, and measure respectively.
Be by volume (15～25): (25～35): (15～25): mix (20～30), makes mix bacterium agent.
Add 50g～100g dextrin in every 1000mL mix bacterium agent, preparation obtains microbial inoculum.
2, preparation chemical mixing fertilizer:
Urea, secondary calcium phosphate and Repone K are pressed mass ratio (30～40): (35～45): mix (15～25), pulverizes, and cross 1 50～200 mesh sieve, makes chemical mixing fertilizer.
3, preparation feces of livestock and poultry starter:
To contain 90% and above feces of livestock and poultry under 70 ℃ ± 10 ℃ envrionment temperatures 2～3 days, compost fermentation, deodorizing, sterilization then through dehydration, drying, are made water ratio and are 15%～25% feces of livestock and poultry starter.
Now pulverize, cross 150～200 mesh sieve through the feces of livestock and poultry starter, stand-by.
4, get chemical mixing fertilizer, feces of livestock and poultry starter, wilkinite after pulverizing, by mass ratio (55～65): (25～35): (5～10) mixing obtains compound manure.
5, preparation microbiobacterial agent:
It is long-pending than being (16～22) to press bacteria liquid by antagonism bacterium (genus bacillus), blown-ball Azotobacter, bacillus cereus, bacillus megaterium, five kinds of microbiobacterial agents of bacillusmusilaginosiengineering: (15～30): (10～20): (18～35): mix (8～15), makes microbiobacterial agent.
6, microbial inoculum is sprayed at the compound manure surface, adds microbiobacterial agent again, mix, the speed of mainshaft be 20～30r/min, rotating disk inclination angle be dewater on 45～55 ° the granulating disc, (the granulation time is 3～10min) in granulation.
And then, obtain anti-second-stubble efficient biologic-organic fertilizer through 40～60 ℃ of drying machines processing 0.5～5h, pulverizers pulverizing, mistake 2.0～3.5mm sieve.
Wherein, the feed ratio of microbial inoculum, compound manure and microbiobacterial agent is 0.6ml～0.8ml: 100g: 1ml～2ml.
7, test:
Following table is each parameter comparison table that product of the present invention and other like product are used:
| Technical indicator | Product of the present invention | Other like product |
| Living bacteria count | 〉=3,000 ten thousand/gram | 〉=2,000 ten thousand/gram |
| Organic | 25％ | 20％ |
| Nitrogen phosphorus potassium total nutrient | ≥6％ | ≥4％ |
| Moisture content | 20％ | 25％ |
| PH value | 5.6～8.5 | 5.6～8.5 |
| Assorted bacterium number | ≤15％ | ≤20％ |
As seen from the above table, the living bacteria count of product of the present invention, organic matter, nitrogen phosphorus potassium total nutrient all are higher than like product, and moisture content, assorted bacterium number then are lower than other like product.
Under greenhouse experiment, manual simulation's continuous cropping plantation for many years plot, the preventing disease production-increasing effect of mensuration product of the present invention.The result shows: product of the present invention can anti-continuous cropping disease, toxicity is little, pollution-free, do not influence soil microbial community unbalance, do not destroy soil microbial community structure and function.
Claims (8)
1, the preparation method of anti-second-stubble efficient biologic-organic fertilizer is characterized in that may further comprise the steps:
1) prepare feces of livestock and poultry starter, chemical mixing fertilizer, microbial inoculum, microbiobacterial agent respectively:
To contain 90% and reach above feces of livestock and poultry fermentation at high temperature, deodorizing, sterilization, through dehydration, drying, make the feces of livestock and poultry starter then;
Urea, secondary calcium phosphate and Repone K are pressed mass ratio 30～40: 35～45: 15～25 mix, and make chemical mixing fertilizer;
High-efficiency nitrogen-fixing bacterium bacterium liquid, phosphate solubilizing bacteria bacterium liquid, potassium solubilizing bacteria bacterium liquid, economic benefits and social benefits actinomycetes bacterium liquid add 50g～100g dextrin after mixing by 15～25: 25～35: 15～25: 20～30 volume ratio again in every 1000mL mixed bacteria liquid, make microbial inoculum;
Genus bacillus, blown-ball Azotobacter, bacillus cereus, bacillus megaterium, bacillusmusilaginosiengineering are pressed 16～22: 15～30: 10～20: 18～35: 8～15 volume ratio is made microbiobacterial agent for mixing;
2) feces of livestock and poultry starter, chemical mixing fertilizer and wilkinite are pressed mass ratio 55～65: mix, pulverize at 25～35: 5～10, makes compound manure;
3) earlier microbial inoculum is sprayed at the compound manure surface, adds microbiobacterial agent again, mix, then dehydration, granulation;
The feed ratio of described microbial inoculum, compound manure and microbiobacterial agent is 0.6ml～0.8ml: 100g: 1ml～2ml.
2,, it is characterized in that the bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the described high-efficiency nitrogen-fixing bacterium bacterium liquid according to the preparation method of the described anti-second-stubble efficient biologic-organic fertilizer of claim 1.
3,, it is characterized in that the bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the described phosphate solubilizing bacteria bacterium liquid according to the preparation method of the described anti-second-stubble efficient biologic-organic fertilizer of claim 1.
4,, it is characterized in that the bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the described potassium solubilizing bacteria bacterium liquid according to the preparation method of the described anti-second-stubble efficient biologic-organic fertilizer of claim 1.
5,, it is characterized in that the bacterium number is 3.5 * 108/milliliter～6.2 * 108/milliliter in the described economic benefits and social benefits actinomycetes liquid according to the preparation method of the described anti-second-stubble efficient biologic-organic fertilizer of claim 1.
6, according to the preparation method of the described anti-second-stubble efficient biologic-organic fertilizer of claim 1, when it is characterized in that preparing compound manure, the powder particle diameter of feces of livestock and poultry starter, chemical mixing fertilizer is respectively 150～200 orders.
7, according to the preparation method of the described anti-second-stubble efficient biologic-organic fertilizer of claim 1, it is characterized in that in the step 3), the speed of mainshaft be 20～30r/min, rotating disk inclination angle be dewater on 45～55 ° the granulating disc, granulation.
8,, it is characterized in that it is 10%～30% that the work in-process after the granulation are dried to water content through 40～60 ℃ earlier according to the preparation method of the described anti-second-stubble efficient biologic-organic fertilizer of claim 7.
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Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143800B (en) * | 2007-09-05 | 2010-09-01 | 韩大山 | Stubble resisting and continuous and alternate cropping fertilizer and producing method thereof |
| CN101870608A (en) * | 2010-06-21 | 2010-10-27 | 山东宝源生物有限公司 | Continuous cropping resisting biological organic and inorganic compound fertilizer and production method thereof |
| CN101352178B (en) * | 2008-06-30 | 2011-01-05 | 康坦生物技术（山东）有限公司 | Compound successive crop-resistance micro-ecological formulation special for cucumber and special bacterial strain and use thereof |
| CN102267828A (en) * | 2010-06-07 | 2011-12-07 | 湖北中烟工业有限责任公司 | Special basal fertilizer used in ecological tobacco leaf plantation |
| CN102320890A (en) * | 2011-08-24 | 2012-01-18 | 甘肃省敦煌种业股份有限公司玉门市种子公司 | Production of hybrid seeds corn is multi-functional special-purpose fertile |
| CN102363583A (en) * | 2011-06-27 | 2012-02-29 | 山东润银生物化工股份有限公司 | Urea containing spore bacteria and preparation method thereof |
| CN101456761B (en) * | 2008-12-19 | 2012-03-21 | 浙江大学 | Method for preparing microbial organic fertilizer for controlling crop blight |
| CN102417422A (en) * | 2011-09-19 | 2012-04-18 | 扬州市森大肥业有限公司 | Compound microbe fertilizer for resisting anthracnose of fruit trees and preparation method thereof |
| CN102491848A (en) * | 2011-12-08 | 2012-06-13 | 陈忠慧 | Microbial fertilizer for eliminating continuous cropping obstacle and preparation method thereof |
| CN102617197A (en) * | 2011-01-31 | 2012-08-01 | 北京丹路实业公司 | Survival technology of agricultural microbial inoculants in high-nutrient fertilizers |
| CN102633564A (en) * | 2012-05-07 | 2012-08-15 | 山东光大肥业科技有限公司 | Biological disease-prevention type culture substrate special for lawn and preparation method thereof |
| CN103172443A (en) * | 2013-03-11 | 2013-06-26 | 华映视讯（吴江）有限公司 | Granular fertilizer and its preparation method |
| CN103951483A (en) * | 2014-05-18 | 2014-07-30 | 段占娥 | Biological antibacterial fertilizer for preventing and controlling soil-borne diseases of crops as well as production process and application of biological antibacterial fertilizer |
| US8940074B2 (en) | 2013-02-19 | 2015-01-27 | Chunghwa Picture Tubes, Ltd. | Pelletized fertilizer and method for manufacturing the same |
| CN104876762A (en) * | 2015-05-08 | 2015-09-02 | 苏州市东山吴侬碧螺春茶叶专业合作社 | Soil improvement agent for improvement of soil fertility in tea garden |
| CN105367305A (en) * | 2015-12-24 | 2016-03-02 | 深圳市芭田生态工程股份有限公司 | Compound microbial fertilizer with disease and pest resistance as well as preparation method and application of compound microbial fertilizer |
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| CN106278416A (en) * | 2015-06-11 | 2017-01-04 | 重庆爱家乡控股集团有限公司 | A kind of preparation method of anti-continuous cropping bio-organic fertilizer special |
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| CN109264945A (en) * | 2018-10-16 | 2019-01-25 | 甘肃中丰农业科技有限公司 | A kind of feces of livestock and poultry deodorizing process method |
| CN109867554A (en) * | 2017-12-02 | 2019-06-11 | 徐州市贾汪区羡人工贸有限公司 | A kind of composite microbial manure |
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| CN101143800B (en) * | 2007-09-05 | 2010-09-01 | 韩大山 | Stubble resisting and continuous and alternate cropping fertilizer and producing method thereof |
| CN101352178B (en) * | 2008-06-30 | 2011-01-05 | 康坦生物技术（山东）有限公司 | Compound successive crop-resistance micro-ecological formulation special for cucumber and special bacterial strain and use thereof |
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| CN102267828A (en) * | 2010-06-07 | 2011-12-07 | 湖北中烟工业有限责任公司 | Special basal fertilizer used in ecological tobacco leaf plantation |
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| CN101870608A (en) * | 2010-06-21 | 2010-10-27 | 山东宝源生物有限公司 | Continuous cropping resisting biological organic and inorganic compound fertilizer and production method thereof |
| CN102617197B (en) * | 2011-01-31 | 2015-02-04 | 北京丹路实业公司 | Survival technology of agricultural microbial inoculants in high-nutrient fertilizers |
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| CN102363583A (en) * | 2011-06-27 | 2012-02-29 | 山东润银生物化工股份有限公司 | Urea containing spore bacteria and preparation method thereof |
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| CN102320890A (en) * | 2011-08-24 | 2012-01-18 | 甘肃省敦煌种业股份有限公司玉门市种子公司 | Production of hybrid seeds corn is multi-functional special-purpose fertile |
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| CN102491848A (en) * | 2011-12-08 | 2012-06-13 | 陈忠慧 | Microbial fertilizer for eliminating continuous cropping obstacle and preparation method thereof |
| CN102633564B (en) * | 2012-05-07 | 2013-12-18 | 山东光大肥业科技有限公司 | Biological disease-prevention type culture substrate special for lawn and preparation method thereof |
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| CN103172443A (en) * | 2013-03-11 | 2013-06-26 | 华映视讯（吴江）有限公司 | Granular fertilizer and its preparation method |
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| CN104876762A (en) * | 2015-05-08 | 2015-09-02 | 苏州市东山吴侬碧螺春茶叶专业合作社 | Soil improvement agent for improvement of soil fertility in tea garden |
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| CN106883007A (en) * | 2015-12-15 | 2017-06-23 | 河南稼禾福肥业有限公司 | Efficient anti-continuous cropping flowers and trees special fertilizer |
| CN105367305A (en) * | 2015-12-24 | 2016-03-02 | 深圳市芭田生态工程股份有限公司 | Compound microbial fertilizer with disease and pest resistance as well as preparation method and application of compound microbial fertilizer |
| CN106278596A (en) * | 2016-08-11 | 2017-01-04 | 吴美燕 | A kind of preparation method of anti-continuous cropping fertilizer |
| CN107056450A (en) * | 2017-04-20 | 2017-08-18 | 山东省果树研究所 | Combination strain fertilizer and its application for preventing and treating pears Jizhua disease |
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| CN109264945A (en) * | 2018-10-16 | 2019-01-25 | 甘肃中丰农业科技有限公司 | A kind of feces of livestock and poultry deodorizing process method |
| CN111789009A (en) * | 2020-07-17 | 2020-10-20 | 西北农林科技大学 | Fertilizing method for relieving bletilla striata continuous cropping obstacles |
| CN111788999A (en) * | 2020-07-17 | 2020-10-20 | 西北农林科技大学 | Fertilizing method for relieving continuous cropping obstacle of scutellaria baicalensis |
| CN112830839A (en) * | 2021-01-15 | 2021-05-25 | 甘南县龙头岭有机肥有限公司 | Method for preparing composite microbial fertilizer |
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