CN102863276A - Seedling raising base material taking rice husk ash and coal ash as adsorbent and preparation method thereof - Google Patents
Seedling raising base material taking rice husk ash and coal ash as adsorbent and preparation method thereof Download PDFInfo
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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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 provides a seedling raising base material taking rice husk ash and coal ash as an adsorbent and a preparation method of the seedling raising base material. One important reason that factory seedling raising is not developed in our country is that cost of a common base material is high, no seedling raising base material is appropriate, and mechanization operation cannot be achieved. The seedling raising base material comprises the rice husk ash, the coal ash and bentonite, wherein the rice husk ash absorbs biogas residues or biogas slurry according to a solid and liquid ratio of 1-2:1, the coal ash absorbs the biogas residues or the biogas slurry according to a solid and liquid ratio of 1-2:1, and the seedling raising base material comprises 20 parts by weight of the rice husk ash absorbing the biogas residues or the biogas slurry, 45-50 parts by weight of the coal ash absorbing the biogas residues or the biogas slurry, 15-20 parts by weight of acid-base adjusting agent furfural residues, 10 parts by weight of vermiculite and 5 parts by weight of adhesive bentonite. Diameters of materials of the rice husk ash, the coal ash, the furfural residues, the vermiculite and the bentonite are all 0.03-2mm. The seedling raising base material is used for preparing novel agriculture seedling raising base materials.
Description
Technical field:
Invention relates to a kind of for the agricultural cultivation field; Be specifically related to a kind of seedling medium and preparation method take rice hull ash, coal ash as sorbent material.
Background technology:
Because China has the soil plough horizon Pesticides now, herbicide residue is serious, and vegetables are crops extremely responsive to agricultural chemicals, weedicide, and growing seedlings with topsoil soils, poisoning usually occurs.The dish people have to excavate woods soil everywhere and hillside soil is grown seedlings, so, the one, the difficulty that fetches earth, the 2nd, cause depletion, the havoc ecotope.Even be not subjected to contaminated soil (few in the reality): because different plot soil physical property is not identical, the characteristics of soil own are again that consolidation is sticking heavy in addition, so realize that take soil as matrix stdn, the dish can actually operating of industrial seedling rearing dish cave are very difficult.
Can be applied in the actual production factory operation except the peat composed of rotten mosses is main material, though a lot of reports are arranged because operation is loaded down with trivial details and the difficulty of drawing materials in enormous quantities, practical application or commercial rare.And the peat composed of rotten mosses is Nonrenewable resources, a large amount of exploitation waste resources.
Common matrix nutrient discharges not equilibrium, release rate is too fast, the relatively poor Index of The Healthy Seedlings that do not reach of seedling quality: because its fertilizer is directly puddled in the base material of growing seedlings without processing, cause matrix conductivity value (EC) excessive, the EC value upper limit that surpasses desirable seedling medium, suppress the germination of seed, seedling rate is lower, second-rate; Early stage is short and small if the fertilizers input deficiency can cause again rice shoot, and the later stage is taken off fertile phenomenon.
The plasmid of common matrix is more coarse, and porosity is excessive, and water conservation, nutrient preserving capability are poor, and the matrix crumb structure is bad, and rice shoot group root is poor, can not form the stopper seedling of consolidation, and the root rate of crumbling that sticks together is too high, is not suitable for hole plate seedling growth and industrial seedling rearing.
Common matrix cost is higher; Do not have suitable seedling medium, can't realize that mechanized is the major reason that China's industrial seedling rearing does not grow up.Also be to transplant the realistic problem that matches with machinery.
Biogas residue and biogas liquid is thick shape solidliquid mixture, so store, utilize cost very high.Concrete application divides two kinds basically: a kind of is to use (biogas residue and biogas liquid separation difficulty, separation costs are very high) after separating; The second is directly used.Directly use and be subjected to equal time in farming season, space constraint, also burn easily seedling.At northern area, can't directly use winter, and storage cost is very high.So bottleneck that has been digested in a large number big-and-middle-sized biogas engineering (especially northeastward) development of biogas residue and biogas liquid.
Summary of the invention:
The purpose of invention provides a kind of with low cost, and physicochemical property is stable, seedling medium and preparation method take rice hull ash, coal ash as sorbent material that can the batch production intensive production.
Above-mentioned purpose realizes by following technical scheme:
Seedling medium take rice hull ash, coal ash as sorbent material, its composition comprises: rice hull ash, coal ash, wilkinite, described rice hull ash be according to solid, liquid than 1～2:1 absorption natural pond slag or the rice hull ash of natural pond liquid, described coal ash for adsorb the parts by weight 20 of the rice hull ash of natural pond slag or the coal ash of natural pond liquid, described absorption biogas residue and biogas liquid than 1～2:1 according to solid, liquid, the parts by weight 45～50 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 15～20 of soda acid mediator agent furfural dregs, the parts by weight 10 of vermiculite, the bentonitic parts by weight 5 of tackiness agent; The diameter of rice hull ash, coal ash, furfural dregs, vermiculite, wilkinite material is all between 0.03～2mm.
Described seedling medium take rice hull ash, coal ash as sorbent material, the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 45 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 20 of described furfural dregs, the parts by weight 10 of described vermiculite, described bentonitic parts by weight 5.
Described seedling medium take rice hull ash, coal ash as sorbent material, the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 50 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 15 of described furfural dregs, the parts by weight 10 of described vermiculite, described bentonitic parts by weight 5.
A kind of preparation method take rice hull ash, coal ash as the seedling medium of sorbent material, getting rice hull ash, coal ash, furfural dregs, vermiculite, wilkinite, be according to solid, liquid than 1～2:1 to adsorb natural pond slag or natural pond liquid according to solid, liquid than 1～2:1 absorption natural pond slag or natural pond liquid, with coal ash with rice hull ash; Get the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 40～50 of the coal ash of described absorption biogas residue and biogas liquid, add soda acid mediator agent furfural dregs and regulate pH value to 6.5～7.5, use the parts by weight 15～20 of furfural dregs, the parts by weight 10 of vermiculite, described bentonitic parts by weight 5; The diameter of the coal ash of the rice hull ash of described absorption biogas residue and biogas liquid, absorption biogas residue and biogas liquid, furfural dregs, vermiculite, wilkinite material is about 0.03～2mm, and water content is 15%～30%; Stack after fully stirring, heap temperature is controlled at 35 ℃～55 ℃, every turning in 10-15 days once, to increase oxygen concentration, the water content of body is piled in minimizing, stacks to get final product in 30-45 days, stirs therebetween three times, carry out air-dry, airing after the stacking, sieve, last quantitatively, packing forms the seedling medium finished product.
Beneficial effect:
1. the present invention is take the waste of big-and-middle-sized biogas engineering, heat power plant, rice source mill as main raw material, and contaminated solution bases oneself upon ecology, draws materials conveniently, and raw material is sufficient; With low cost, physicochemical property is stable, can the batch production intensive production.
The biogas residue and biogas liquid that the present invention adopts is the product after animal excrement mixed plant stalk fully ferments in methane-generating pit, and it is extremely abundant to include nutritive substance, can fully satisfy the crops seedling stage nutritional needs.
The rice hull ash that the present invention adopts and the scientific matching of coal ash, need not separate biogas residue and biogas liquid, eradicate biogas residue and biogas liquid and separated the high hidden danger of difficult cost, solved the combined symptoms that current biogas residue and biogas liquid is difficult to widely apply, removed the bottleneck problem that limits big-and-middle-sized biogas engineering development, can directly adsorb, the organic nutrient that adsorbs proportioning by this invention can satisfy nutrition in seedling stage fully, support equilibrium, abundant, seedling growth leaf look dark green, cane is sturdy, well developed root system.
The present invention is by raw material science compatibility, and matrix water-retentivity, ventilation property, heat retaining property, group's root are good, are desirable Application of Artificial Intelligence seedling mediums.
The present invention is mainly with industrial or agricultural byproduct rice hull ash, coal ash, particle diameter is 0.03-0.25mm, below, biogas residue and biogas liquid, furfural dregs, vermiculite, wilkinite etc. replace traditional seedling medium take soil and the peat composed of rotten mosses as main body for main raw material, the Main Nutrients in the matrix is provided by biogas residue and biogas liquid.Utilize to do rice hull ash and coal ash is bulk, porous, physical property that adsorptive power is strong, adsorb respectively natural pond slag, natural pond liquid according to solid, liquid ratio of weight and number 1～2:1, and the raw material stirring such as additional furfural dregs, vermiculite, wilkinite are even, can directly use, and make simple.
The present invention is take rice hull ash and coal ash as sorbent material; Directly absorption biogas residue and biogas liquid, biogas residue and biogas liquid need not separate direct batch production utilization; Matrix safety need not be sterilized; Because the starting material that matrix is chosen itself are all through pyroprocessing or fermentation; With in the furfural and biogas residue and biogas liquid, make the matrix soda acid suitable.
The present invention can directly utilize biogas residue and biogas liquid in the four seasons in a large number, solves the Northeast's biogas residue and biogas liquid in winter and stores nowhere unmanageable problem; Biogas residue and biogas liquid is thick shape solidliquid mixture, so store, utilize cost very high.
The present invention uses that rice hull ash and coal ash are directly adsorbed biogas residue and biogas liquid cheaply, can in time digest and assimilate a large amount of biogas residue and biogas liquids, make biogas residue and biogas liquid store, use with solid state, effective, with these waste ' s reclamations, be applied in the seedling medium, create a kind of new, organically, the product that solidifies.
Though product of the present invention is organic seedling raising matrix, need not ferment when doing matrix, can directly use; Main raw material(s) all is agriculture and industry waste, so cost is low; Owing to draw materials science, prescription rationally, simple process is easily gone.
Seedling medium main raw material(s) of the present invention is rice hull ash, coal ash, biogas residue and biogas liquid, furfural etc., all is the product through high temperature or fermentation, and security is good, need not process again; And physicochemical character meets the seedling matrix material requirement, does not need reprocessing to process, so produce simple and easy to do; Raw materials cost is low relative all low with tooling cost.
Material safety of the present invention, proterties are stablized, and the source is abundant, are fit to batch production, standardized work; Main raw material(s) itself is the product after pyroprocessing or the fermentation, the sterilization of having killed virus, and security is good; And because of process stabilizing, the material physicochemical character is stable; Material is the byproduct of bulk product, and the source is abundant; Can fully satisfy batch production, standardized work demand.
The present invention adopts in the furfural (genus organism) and biogas residue and biogas liquid (genus organism), makes the matrix soda acid suitable, and resiliency is strong.The matrix organotrophy is abundant, and balanced release satisfied whole nutrition in seedling stage if overcome conventional seedbed system matrix, then matrix conductivity value in early stage (EC) is excessive, suppresses the germination of seed, and seedling rate is lower, second-rate, if and the fertilizers input deficiency can cause rice shoot short and small early stage, the later stage is taken off fertile phenomenon.
The raw material that the present invention adopts all is agriculture and industry waste, and all is the byproduct of bulk product, so it is wide to originate.And with low cost; Because of starting material related production process stabilizing, so the physico-chemical property of raw material is stable.Be convenient to batch production, standardized production, form the matrix of stable performance; Complete processing is simple, and is easy to operate, simply puddles to get final product.
Matrix of the present invention draw materials environmental protection, utilization of waste material; Operation is simple, labor savings; Be fit to batch production, normalizing operation; Reduce the probability of disease spread; Because matrix porosity is moderate, crumb structure is good, good without germ, permeability, the preserve moisture and fertility ability strong, manageability, group's root is good, can form the stopper seedling of consolidation, and the root rate of crumbling that sticks together is little, the stem stalk is sturdy, the leaf look dark green is, plump, makes nursery effect ideal.
The present invention is with rice hull ash, coal ash, biogas residue and biogas liquid, the furfural dregs main raw material as seedling medium; solved the problem of large and medium-sized biogas engineering, power station, rice source mill byproduct subsequent disposal difficulty; preserve the ecological environment, realized the recycling of refuse, turn waste into wealth.This product utilization rice hull ash, the physical property that Coal Ash Adsorption power is strong are directly adsorbed biogas residue and biogas liquid, have solved biogas residue and biogas liquid and have separated difficult, as to be difficult for a storage difficult problem, make its curing; Life cycle of the product is short, and life cycle is also short, and money collecting is fast.
Embodiment:
Embodiment 1:
A kind of with rice hull ash, coal ash is the seedling medium of sorbent material, its composition comprises: rice hull ash, coal ash, wilkinite, described rice hull ash is according to solid, the rice hull ash of liquor ratio 1～2:1 absorption natural pond slag or natural pond liquid, described coal ash is according to solid, the coal ash of liquor ratio 1～2:1 absorption natural pond slag or natural pond liquid, the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 45～50 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 10 of vermiculite, adding bentonitic parts by weight 5 carries out bonding, furfural dregs is used for the potential of hydrogen with matrix, neutralization is between pH value to 6.5～7.8, and the parts by weight of consumption are 15～20.
The worm's ovum kill ratio is greater than 99% in this product, and viral kill ratio is greater than 99%, and the diameter diameter was at 0.03～2mm after the base material of growing seedlings was pulverized, and air-dry rear moisture controlled is in 30%; This seedling medium pH value is that 6.5～7.5, EC is less than 6.5 mScm; Behind the vernalization planting seed, dish Miao Lu cave, cave rate is lower than 0.5%.
Embodiment 2:
The described seedling medium take rice hull ash, coal ash as sorbent material of embodiment 1, the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 45 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 20 of described furfural dregs, the parts by weight 10 of described vermiculite, described bentonitic parts by weight 5.
Embodiment 3:
The described seedling medium take rice hull ash, coal ash as sorbent material of embodiment 1, the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 50 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 15 of described furfural dregs, the parts by weight 10 of described vermiculite, described bentonitic parts by weight 5.
Embodiment 4:
The described seedling medium take rice hull ash, coal ash as sorbent material of embodiment 1, its composition comprises: rice hull ash, coal ash, wilkinite, described rice hull ash be according to solid, liquid than 1.5:1 absorption natural pond slag or the rice hull ash of natural pond liquid, described coal ash for according to the parts by weight 20 of solid, liquid than the rice hull ash of 1.5:1 absorption natural pond slag or the coal ash of natural pond liquid, described absorption biogas residue and biogas liquid, the parts by weight 47 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 18 of furfural dregs are regulated pH value to 6.5～7.5, the parts by weight 10 of vermiculite, the bentonitic parts by weight 5 of tackiness agent.
Embodiment 5:
A kind of preparation method take rice hull ash, coal ash as the seedling medium of sorbent material, get rice hull ash, coal ash, furfural dregs, vermiculite, wilkinite, be according to solid, liquid than 1～2:1 to adsorb natural pond slag or natural pond liquid according to solid, liquid than 1～2:1 absorption natural pond slag or natural pond liquid, with coal ash with rice hull ash
The parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 40～50 of the coal ash of described absorption biogas residue and biogas liquid, add soda acid mediator agent furfural dregs and regulate pH value to 6.5～7.5, use the parts by weight 15～20 of furfural dregs in the regulate process, the parts by weight 10 of vermiculite, described bentonitic parts by weight 5.
The diameter of the coal ash of the rice hull ash of described absorption biogas residue and biogas liquid, absorption biogas residue and biogas liquid, furfural dregs, vermiculite, wilkinite material is about 0.03～2mm, and water content is 15%～30%.
Stack after fully stirring, heap temperature is controlled at 35 ℃～55 ℃, every turning in 10-15 days once, to increase oxygen concentration, the water content of body is piled in minimizing, stacks to get final product in 30-45 days, stirs therebetween three times, carry out air-dry, airing after the stacking, sieve, last quantitatively, packing forms the seedling medium finished product.
Embodiment 6:
Described seedling medium and the preparation method take rice hull ash, coal ash as sorbent material of above embodiment, rice hull ash, coal ash, biogas residue and biogas liquid, furfural dregs, vermiculite, wilkinite are main raw material.Rice hull ash is adsorbed natural pond slag or natural pond liquid, coal ash is adsorbed natural pond slag or natural pond liquid according to solid, liquid than 1～2:1 than 1～2:1 according to solid, liquid.
The parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 45～50 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 15～20 of furfural dregs, the parts by weight 10 of vermiculite, bentonitic parts by weight 5.
The diameter of the coal ash of the rice hull ash of described absorption biogas residue and biogas liquid, absorption biogas residue and biogas liquid, furfural dregs, vermiculite, wilkinite material is about 0.03～2mm, and water content is 15%～30%.
Each material is stacked after mixing fully stirring according to aforementioned proportion, heap temperature is controlled at 35 ℃～55 ℃, every turning in 10-15 days once, to increase oxygen concentration, the water content of body is piled in minimizing, stacks to get final product in 30-45 days, stirs therebetween three times, carry out air-dry, airing after the stacking, sieve, last quantitatively, packing forms the seedling medium finished product.
Claims (4)
1. seedling medium take rice hull ash, coal ash as sorbent material, its composition comprises: rice hull ash, coal ash, wilkinite, it is characterized in that: described rice hull ash for according to solid, liquid than 1～2:1 absorption natural pond slag or the rice hull ash of natural pond liquid, described coal ash for adsorb the parts by weight 20 of the rice hull ash of natural pond slag or the coal ash of natural pond liquid, described absorption biogas residue and biogas liquid than 1～2:1 according to solid, liquid, the parts by weight 45～50 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 15～20 of soda acid mediator agent furfural dregs are regulated
PH value to 6.5～7.5, the parts by weight 10 of vermiculite, the bentonitic parts by weight 5 of tackiness agent; The diameter of rice hull ash, coal ash, furfural dregs, vermiculite, wilkinite material is all between 0.03～2mm.
2. the seedling medium take rice hull ash, coal ash as sorbent material according to claim 1, it is characterized in that: the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 45 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 20 of described furfural dregs, the parts by weight 10 of described vermiculite, described bentonitic parts by weight 5.
3. the seedling medium take rice hull ash, coal ash as sorbent material according to claim 1, it is characterized in that: the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 50 of the coal ash of described absorption biogas residue and biogas liquid, the parts by weight 15 of described furfural dregs, the parts by weight 10 of described vermiculite, described bentonitic parts by weight 5.
4. preparation method take rice hull ash, coal ash as the seedling medium of sorbent material, it is characterized in that: getting rice hull ash, coal ash, furfural dregs, vermiculite, wilkinite, be according to solid, liquid than 1～2:1 to adsorb natural pond slag or natural pond liquid according to solid, liquid than 1～2:1 absorption natural pond slag or natural pond liquid, with coal ash with rice hull ash; Get the parts by weight 20 of the rice hull ash of described absorption biogas residue and biogas liquid, the parts by weight 40～50 of the coal ash of described absorption biogas residue and biogas liquid add soda acid mediator agent furfural dregs and regulate
PH value to 6.5～7.5, the parts by weight 15～20 of use furfural dregs, the parts by weight 10 of vermiculite, described bentonitic parts by weight 5; The diameter of the coal ash of the rice hull ash of described absorption biogas residue and biogas liquid, absorption biogas residue and biogas liquid, furfural dregs, vermiculite, wilkinite material is about 0.03～2mm, and water content is 15%～30%; Stack after fully stirring, heap temperature is controlled at 35 ℃～55 ℃, every turning in 10-15 days once, to increase oxygen concentration, the water content of body is piled in minimizing, stacks to get final product in 30-45 days, stirs therebetween three times, carry out air-dry, airing after the stacking, sieve, last quantitatively, packing forms the seedling medium finished product.
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| CN201110188304.1A CN102863276B (en) | 2011-07-06 | 2011-07-06 | Seedling raising base material taking rice husk ash and coal ash as adsorbent and preparation method thereof |
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| CN201110188304.1A CN102863276B (en) | 2011-07-06 | 2011-07-06 | Seedling raising base material taking rice husk ash and coal ash as adsorbent and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103664284A (en) * | 2013-11-20 | 2014-03-26 | 青岛天人环境股份有限公司 | Biogas liquid cured organic fertilizer for increasing bean yield and preparation method of organic fertilizer |
| CN104031648A (en) * | 2014-05-19 | 2014-09-10 | 黑龙江省科学院自然与生态研究所 | City garden soil secondary salinization improving agent and preparation method thereof |
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| CN101530056A (en) * | 2008-03-13 | 2009-09-16 | 沈康 | Method for growing vegetables |
| CN101654383A (en) * | 2009-09-11 | 2010-02-24 | 长子县惠民农业科技开发有限公司 | Treating technology for taking deacidified furfural residue as culture mediums |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101530056A (en) * | 2008-03-13 | 2009-09-16 | 沈康 | Method for growing vegetables |
| CN101654383A (en) * | 2009-09-11 | 2010-02-24 | 长子县惠民农业科技开发有限公司 | Treating technology for taking deacidified furfural residue as culture mediums |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103664284A (en) * | 2013-11-20 | 2014-03-26 | 青岛天人环境股份有限公司 | Biogas liquid cured organic fertilizer for increasing bean yield and preparation method of organic fertilizer |
| CN103664284B (en) * | 2013-11-20 | 2015-04-22 | 青岛天人环境股份有限公司 | Biogas liquid cured organic fertilizer for increasing bean yield and preparation method of organic fertilizer |
| CN104031648A (en) * | 2014-05-19 | 2014-09-10 | 黑龙江省科学院自然与生态研究所 | City garden soil secondary salinization improving agent and preparation method thereof |
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| CN102863276B (en) | 2015-06-03 |
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