CN108504362A - A kind of alkaline land modifying agent and preparation method thereof - Google Patents
A kind of alkaline land modifying agent and preparation method thereof Download PDFInfo
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- CN108504362A CN108504362A CN201810162736.7A CN201810162736A CN108504362A CN 108504362 A CN108504362 A CN 108504362A CN 201810162736 A CN201810162736 A CN 201810162736A CN 108504362 A CN108504362 A CN 108504362A
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- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
A kind of alkaline land modifying agent of present invention raising and saline and alkali land improvement method, raw material include：Aluminum sulfate foaming agent, chelating agent, mushroom bran, gelling agent, humic acid, activator, water；The gelling agent is TYLOSE 30000 and polyvinyl alcohol mass ratio is 1:12 mixture, the foaming agent are of animal or plant nature protide foaming agent, and the mushroom bran is vinegar slot.The present invention provides a kind of alkaline land modifying agent and modification methods, and special foam form is used cooperatively and be made by various ingredients, efficiently and can save the realization of water resource and go salinization of soil, while also have certain production-increasing function to crop.
Description
Technical field
The invention belongs to soil remediation fields, more particularly to a kind of alkaline land modifying agent and preparation method thereof.
Background technology
Salt-soda soil is a type of salt aggregation, refer to inside soil contained by salinity influence the normal life of crop
Long, according to UNESCO and food and agricultural organization's incomplete statistics, the area in whole world salt-soda soil is 9.5438 hundred million hectares,
Wherein China is 99,130,000 hectares.The formation of China's alkaline earth and alkali-affected soil, it is most of accumulative related with Carbonates In Soil,
Thus basicity is generally higher, and serious salt affected soil regional plant can hardly survive.The shape of China's alkaline earth and alkali-affected soil
At, it is most of accumulative related with Carbonates In Soil, thus basicity is generally higher, serious salt affected soil regional plant is several
It cannot survive.
Salt-soda soil briefly, can be divided into light salt-soda soil, moderate saline-alkali soil and heavy saline using in process.Gently
Salt-soda soil refers to its emergence rate in 70%-80%, its salt content is below 3/1000ths；Heavy saline refers to its salt content
More than 6/1000ths, emergence rate is less than 50%；This intermediate block is exactly that moderate saline-alkali soil (is expressed as with pH value：Moderate saline-alkali soil PH
Value is：7.1-8.5, moderate saline-alkali soil pH value are：8.5-9.5 heavy salinized ground pH value is：9.5 or more).Now with science
The development of technology should not only see unfavorable one side, it should more be regarded as very precious land resource, improve salt-soda soil
Plantation for crops is to efficiently use the good method in salt-soda soil, with huge economic value and the value of environmental protection.
Improvement for salt-soda soil, common method have：1, the desalinization of soil by flooding or leaching, the desalinization of soil by flooding or leaching are exactly that water is poured into salt-soda soil, make soil
Salinity dissolves, and is oozed under and is discharged in deep soil or elute away the solubility in topsoil is saline and alkaline, side infiltration gutter adds
To exclude；2, it levels land, leveling land can make to ooze under uniform moisture, improve rainfall leaching salt and irrigate the effect of the desalinization of soil by flooding or leaching, prevent
Soil plaque-like salination；3, rake the soil level in due course, rake the soil level can loose table soil, block soil capillary water and convey salinity to earth's surface, play
Prevent the effect of the accumulation of salt in the surface soil；4, applying organic manure, rational use of chemical fertilizer, organic fertilizer form humus, energy through microorganism decomposition, conversion
The buffer capacity of soil is improved, and can act on forming sodium humate with sodium carbonate, reduces surface soil alkalinity.It 5, can be special with salt-soda soil
Soil is effectively improved with soil conditioner " solodization ".
Currently, most efficient method is still based on the desalinization of soil by flooding or leaching, but excessive water drenching causes soil fertility to reduce, and
Original soil internal structure and ecology can be destroyed.It is poly- that elution concussion process also destroys original aggregate and micelle in soil
Body, repeatedly elution makes the physical property of soil not improve, or even generates counter productive in terms of soil liquid pH value.And repeatedly
The a large amount of waste water resources of elution meeting, and in varieties in saline-alkali areas, freshwater resources are natively precious.The addition of aluminum sulfate, effectively changes
It has been apt to soil property, it is with obvious effects especially to reducing alkalization of soils degree.Soil pH value, the soil weight, soil particle grain size etc.
Aspect has improvement result to soil, and with obvious effects.Calcium and magnesium plasma is released also with the addition of aluminum sulfate,
Also playing to a certain extent reduces the effect of soil salinity characters degree.But aluminum sulfate improvement is used alone, can not comprehensively solve
Certainly soil issues.Since soil also has higher salinization degree, aluminum sulfate not to be effectively improved the salinization degree problem of soil, even
The content of salts substances increases in soil when adding aluminum sulfate.Therefore, aluminum sulfate only converts soil types to from soda type
Sulfuric acid type, problem is alleviated, but is not fully solved.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of alkaline land modifying agent and saline and alkali land improvement method, pass through a variety of groups
Point it is used cooperatively and is made special foam form, efficiently and can save the realization of water resource and go salinization of soil, while to crop
Also there is certain production-increasing function.
Purpose of the present invention is to what is be achieved through the following technical solutions:
A kind of alkaline land modifying agent, raw material include：In parts by mass, the aluminum sulfate of 5-10 mass parts, 0.5-1 mass parts
Foaming agent, the chelating agent of 1-3 mass parts, the mushroom bran of 1-2 mass parts, the gelling agent of 1-3 mass parts, the rotten of 1-5 mass parts plant
Acid, the activator of 0.5-1 mass parts, the water of 50-100 mass parts；The gelling agent is TYLOSE 30000 and polyethylene
Alcohol mass ratio is 1:The mixture of 1-2, the foaming agent are of animal or plant nature protide foaming agent, and the mushroom bran is vinegar slot；It is described
The preparation method of modifying agent is：Component in addition to foaming agent is mixed and is sufficiently stirred into emulsion form suspension, hair is then added
Infusion puts into foaming machine and foams, when curing of the expanding foam solution in foaming machine a length of 10-20min.
Further, wherein the chelating agent is calcium phosphate, calcium citrate, at least the one of cationic-type polyacrylamide
Kind.
Further, wherein the average molecular weight of polyvinyl alcohol is 16000.
Further, wherein activator be tiny iron powder, sulphur powder at least one.
Further, wherein the operating temperature of foaming machine is 20-30 DEG C, and the injection pressure of foaming machine is 10-12MPa.
A kind of saline and alkali land improvement method, includes the following steps：(1) the weeds sundries in salt-soda soil is removed, deep plough 30-50cm
And it digs；
(2) above-mentioned foam-like modifying agent is sent forth, the thickness of foam is that 10-20cm is turned over whole again after being kept for 4-8 hours
It is flat；
(3) it sows, fertilising.
Further, modifying agent can also sent forth wherein in step 2, kept for 4-8 hours, after turning over leveling, by 2-4
It is eluted once or twice after it.
Further, wherein step 2 can be carried out repeatedly, until reaching required soil salinity and alkalinity, each interval time
It is 2-7 days.
Further, wherein the weather of the modification method is when temperature continuous-stable lacks wind day at 20 DEG C or more without rain
Gas.
Further, wherein the floristics sowed is salt resistance alkali kind.
Aluminum sulfate effectively improves soil property, with obvious effects especially to reducing alkalization of soils degree.Soil pH value, soil
Earth unit weight, soil particle grain size etc. have improvement result to soil, and with obvious effects.Calcium and magnesium plasma is also with sulfuric acid
The addition of aluminium and be released, also play to a certain extent reduce soil salinity characters degree effect.
The basic structure of humic acid macromolecular is aromatic ring and alicyclic ring, and carboxyl, hydroxyl, carbonyl, quinonyl, methoxyl group are connected on ring
Equal functional groups.It can be conducive to nutrient and transmitted to crop, and can improve soil texture with the metal ion clutch in water,
Be conducive to the growth of crops.
The present invention adds at least one that activator is tiny iron powder or fine sulphur powder, preferably tiny iron powder.In air
In can have an effect with oxygen, to aoxidize, generate certain heat of oxidation and hydrogen ion.It, can in being applied to soil
Oxygen is excluded, good environment is provided for the production of anaerobic bacteria, the heat generated further can promote bacterium quickly to breed,
The hydrogen ion of generation can reduce the pH value of soil, while it can be used as reunion center, reunion soil to reduce in lessivation to soil
The loss of earth.Tiny iron powder is the fine powder of 10-44 μm of granularity, and too small fine powder will lead to oxidation rate faster, to make reaction
Excessively fierce, excessive iron powder is difficult to slowly aoxidize, and generates the effect of the present invention.
Mushroom bran is to carry out edible mushroom substituting stuff cultivation using raw materials such as stalk, sawdusts, and the culture medium residue after receiving is commonly called as
Edible fungus culturing waste material, bacteria residue or clout；It is hypha of edible fungus residuum and is digested through edible mushroom, the crude fibre of qualitative change occurs for structure
The compound of equal ingredients.Mushroom bran in the present invention is preferably vinegar slot, using the leftover bits and pieces of grain-production vinegar, to contain abundant
Acid and abundant microorganism and fermenting enzyme, can effective degrading alkaline substance in the soil, and can be microorganism
Production provides energy and heat.
Gelling agent is TYLOSE 30000 and polyvinyl alcohol mass ratio is 1:The mixture of 1-2.It is for native cellulose
The polysaccharide most wide, content is most, source very abundant are distributed in nature.TYLOSE 30000 is carboxymethyl etherification technology
One kind, aqueous solution have the effects that thickening, the protection of film forming, gluing, water tariff collection, colloid, emulsification and suspend.Polyvinyl alcohol is
One kind of polymeric sustained release agent has abundant hydroxyl.After the cooperation of the two certain proportion, the viscosity shape of modifying agent can be effectively improved
It is formed and is protected at aqueous gel, and suspension and emulsifying effectiveness are improved for other insoluble matters, make mushroom bran, activator dispersion more
Add uniformly.Modifying agent under certain viscosity and consistency, can in the soil the long period stop, and reunion soil can be played
The effect of gravel prevents in lessivation or is added the process of a large amount of water, destroys the microstructure of soil.For the viscous of modifying agent
Degree and gel-forming stability consider that polyvinyl alcohol molecule amount is preferably 16000.TYLOSE 30000 and polyvinyl alcohol quality
Than being 1:1-2, preferably 1:1.
Chelating agent is calcium phosphate, calcium citrate, at least one of cationic-type polyacrylamide, and chelating agent can chelate soil
Ionizable metal salt in earth reduces salt-soda soil to realize.In fact, such as other components such as humic acid more or less all have centainly
Chelation, the present invention in be especially added with chelating agent play enhancing chelating effect.
Of animal or plant nature protide foaming agent is that the natural foaming agent by of animal or plant nature is divided into dynamic according to raw material difference
Physical property and vegetable protein foaming agent, wherein considering cost, more preferably vegetable protein foaming agent.Vegetable protein class is sent out
Infusion (commercially available) but can flavor Tea Saponin type and saponin type, select the high-quality natural plants high molecular material of import be original
Material, the chemical reaction through a series of complex generate, and product is in lurid pure transparent oily liquid.It is insensitive to hard water, nothing
Malicious, tasteless, deposit-free.PH value does not generate environment pollution close to neutrality.The foaming agent shelf-stable is unlikely to deteriorate, and is had excellent
Different blistering energy, the stability of foaming abundancy, foam are moderate.
Aluminum sulfate improvement is used alone, it can not comprehensive soil issues.Since soil also has higher salinization degree, aluminum sulfate
It is not effectively improved the salinization degree problem of soil, or even the content of salts substances increases in soil when addition aluminum sulfate.Therefore,
Aluminum sulfate only converts soil types to sulfuric acid type from soda type, and problem is alleviated, but is not fully solved.Elution can have
Effect improves the salinization degree of soil.In the case where aluminum sulfate additive amount is certain, with the increase of elution number, sulfate ion
It is decreased obviously with the concentration of the anion such as chlorion.Carbonate and bicarbonate radical also decreased significantly, but titanium dioxide in by air
The influence of carbon, decrease speed also significantly improve the ionic consequences of soil there is no sulfate radical and chlorion are fast, make soil more
It is suitble to plant growth.The effect for the chemical composition of soil that improves significantly is eluted, but the aluminum sulfate being added into is with elution
There is a large amount of passage, puts into the part of sulfuric acid aluminium hydrocolloid that aluminum sulfate is formed for the first time and be also destroyed, affect aluminum sulfate pair
The improved effect of soil.Meanwhile lessivation also destroys original aggregate and microaggregate in soil, repeatedly elution makes soil
The physical property of earth does not improve, or even generates counter productive in terms of soil liquid pH value.
Therefore the present invention is using the preceding component object producing foamed form by the present invention by foaming agent, and in soil surface
It is covered, active ingredient can be made, be slowly immersed into soil, saline and alkaline is fully taken away, greatly reduce the usage amount of water,
Drop alkali efficiency is improved, and the form of soil itself will not be destroyed.And after forming foam, it can be effectively isolated air, be conducive to
Soil largely breeds anaerobism acid in the case of capped, using the component in modifying agent, to biology drop alkali.The present invention's
Modifying agent can also be used cooperatively according to the concrete condition of soil with elution, can sent modifying agent forth, kept carrying out for 4-8 hours
It elutes once or twice, wherein it is preferred that once elute.Modifying agent can also repeatedly be sent forth, until reaching required soil
Earth saline and alkaline, each interval time are 2-7 days.
The advantageous effects of the present invention：
The present invention provides a kind of alkaline land modifying agent and saline and alkali land improvement methods, are used cooperatively by various ingredients, lead to
Cross various ingredients and be used cooperatively and be made special foam form, can efficiently and save water resource realization go salinization of soil, together
When also have certain production-increasing function to crop.
Specific implementation mode
The present invention is further described with reference to embodiment, the scope of the present invention is not restricted by the embodiments.This hair
Bright range proposes in detail in the claims.
Foaming agent is purchased from the nonionic vegetalitas foaming agent of prosperous spring cement foaming agent.
Vinegar slot is provided by a local vinegar brewing factory, and crushing is dried.
The iron fine powder that tiny iron powder is 99% purchased from lark prestige Science and Technology Ltd. purity.
Polyvinyl alcohol is purchased from the polyvinyl alcohol of lark prestige Science and Technology Ltd., degree of hydrolysis 98%, average molecular weight 16000.
Embodiment 1
A kind of alkaline land modifying agent, raw material include：In parts by mass, the aluminum sulfate of 8 mass parts, the hair of 0.8 mass parts
Infusion, the chelating agent of 2 mass parts, the mushroom bran of 1.5 mass parts, the gelling agent of 1.5 mass parts, the humic acid of 3 mass parts, 0.8 matter
Measure the activator of part, the water of 80 mass parts；The gelling agent is TYLOSE 30000 and polyvinyl alcohol mass ratio is 1:1
Mixture, the foaming agent are of animal or plant nature protide foaming agent, and the mushroom bran is vinegar slot；The preparation method of the modifying agent
For：Component in addition to foaming agent is mixed and is sufficiently stirred into emulsion form suspension, foaming agent is then added, is put into foaming machine
Foam, when curing of the expanding foam solution in foaming machine a length of 15min.
Chelating agent is cationic-type polyacrylamide.The average molecular weight of polyvinyl alcohol is 16000.Activator is fine iron
Powder.
The operating temperature of foaming machine is 25 DEG C, and the injection pressure of foaming machine is 10MPa.
A kind of saline and alkali land improvement method, includes the following steps：(1) the weeds sundries in salt-soda soil is removed, deep ploughing 50cm is simultaneously
It digs；
(2) above-mentioned foam-like modifying agent is sent forth, the thickness of foam is 15cm, is kept for 6 hours, after turning over leveling, by 3 days
After once eluted；After 5 days, repeat the above steps primary；
(3) it sows, fertilising.
Embodiment 2
A kind of alkaline land modifying agent, raw material include：In parts by mass, the aluminum sulfate of 5 mass parts, the foaming of 1 mass parts
Agent, the chelating agent of 1 mass parts, the mushroom bran of 2 mass parts, the gelling agent of 1 mass parts, the humic acid of 5 mass parts, 0.5 mass parts
Activator, the water of 100 mass parts；The gelling agent is TYLOSE 30000 and polyvinyl alcohol mass ratio is 1:2 mixing
Object, the foaming agent are of animal or plant nature protide foaming agent, and the mushroom bran is vinegar slot；The preparation method of the modifying agent is：It will
Component mixing in addition to foaming agent is sufficiently stirred into emulsion form suspension, and foaming agent is then added, puts into foaming machine and carries out
Foaming, when curing of the expanding foam solution in foaming machine a length of 10min.The chelating agent is cationic-type polyacrylamide.Polyethylene
The average molecular weight of alcohol is 16000.Activator is fine sulphur powder.The operating temperature of foaming machine is 20 DEG C, the injection pressure of foaming machine
Power is 12MPa.
A kind of saline and alkali land improvement method, includes the following steps：(1) the weeds sundries in salt-soda soil is removed, deep ploughing 30cm is simultaneously
It digs；
(2) foam-like modifying agent is sent forth, the thickness of foam is 10cm, after being kept for 8 hours, turns over leveling again, carries out two
Secondary elution；It was repeated once above-mentioned steps every 7 days.
(3) it sows, fertilising.
Embodiment 3
A kind of alkaline land modifying agent, raw material include：In parts by mass, the aluminum sulfate of 10 mass parts, the hair of 0.5 mass parts
Infusion, the chelating agent of 3 mass parts, the mushroom bran of 1 mass parts, the gelling agent of 3 mass parts, the humic acid of 1 mass parts, 1 mass parts
Activator, the water of 50 mass parts；The gelling agent is TYLOSE 30000 and polyvinyl alcohol mass ratio is 1:1 mixing
Object, the foaming agent are of animal or plant nature protide foaming agent, and the mushroom bran is vinegar slot；The preparation method of the modifying agent is：It will
Component mixing in addition to foaming agent is sufficiently stirred into emulsion form suspension, and foaming agent is then added, puts into foaming machine and carries out
Foaming, when curing of the expanding foam solution in foaming machine a length of 20min.Chelating agent is calcium phosphate.The average molecular weight of polyvinyl alcohol is
16000.Activator is tiny iron powder.The operating temperature of foaming machine is 30 DEG C, and the injection pressure of foaming machine is 12MPa.
A kind of saline and alkali land improvement method, includes the following steps：(1) the weeds sundries in salt-soda soil is removed, deep ploughing 50cm is simultaneously
It digs；
(2) above-mentioned foam-like modifying agent is sent forth, the thickness of foam is that 20cm turns over leveling again after being kept for 8 hours；Weight
Multiple above-mentioned steps 1 time；
(3) it sows, fertilising.
Comparative example 1
Prepared by method same as Example 1, in addition to not adding foaming agent.
Comparative example 2
Prepared by method same as Example 1, in addition to vinegar grain to be replaced with to common edible fungus culturing bacteria residue.
Comparative example 3
Prepared by method same as Example 1, in addition to not adding gelling agent.
Comparative example 4
Prepared by method same as Example 1, in addition to not adding activator.
Comparative example 5
Prepared by method same as Example 1, in addition to not adding polyvinyl alcohol in gelling agent.
Comparative example 6
Prepared by method same as Example 1, in addition to not adding TYLOSE 30000 in gelling agent.
Comparative example 7
Blank group
Test site is：The pH on the holder farm of Jiangsu Guanyun County northeast, testing soil is 10.5-11.By one mu of soil
Ground is divided into 10 pieces, tests above-mentioned 9 kinds of samples and blank group respectively.Crop varieties：First jade 335.
Soil physical and chemical property is investigated:After improvement, after stablizing 1-2 days, the pH value of soil at sampling and testing 10cm.
Yield result：Yield is counted, as a result such as following table.
The results contrast of table 1 embodiment and comparative example
| pH | Product K g | |
| Embodiment 1 | 7.3 | 386 |
| Embodiment 2 | 7.1 | 409 |
| Embodiment 3 | 7.8 | 368 |
| Comparative example 1 | 8.5 | 321 |
| Comparative example 2 | 9.2 | 265 |
| Comparative example 3 | 9.1 | 288 |
| Comparative example 4 | 8.2 | 334 |
| Comparative example 5 | 8.7 | 307 |
| Comparative example 6 | 8.4 | 313 |
| Comparative example 7 | 10.5 | 221 |
Embodiment 1 is found with the comparison of embodiment 2, can reduce pH value to a certain degree after eluting twice, but effect is not very bright
It is aobvious, the waste of certain water resource is caused instead.Embodiment 3 is not bound with elution, finds pH defects, but compares yield hair
Existing, yield, which has no, to be remarkably decreased, thus it is speculated that is microbiologic population and the soil knot due to not having elution preferably to save soil
Structure.It is specific whether to need to combine elution, it can be carried out according to cost needs.Comparative example 1-6 is compared, it is found that various components all play
More crucial effect.Wherein vinegar grain replaces with other bacteria residues, and effect reduces more notable；Polyvinyl alcohol and carboxymethyl in gelling agent
Cellulose ether adds by a certain percentage, is capable of the viscosity and degree of gelation of Effective Regulation modifying agent.
Those of ordinary skills in the art should understand that：The above is only a specific embodiment of the present invention, and
It is not used in the limitation present invention, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done,
It should be included within protection scope of the present invention.
Claims (10)
1. a kind of alkaline land modifying agent, raw material include：In parts by mass, the aluminum sulfate of 5-10 mass parts, 0.5-1 mass parts
Foaming agent, the chelating agent of 1-3 mass parts, the mushroom bran of 1-2 mass parts, the gelling agent of 1-3 mass parts, the humic acid of 1-5 mass parts,
The activator of 0.5-1 mass parts, the water of 50-100 mass parts；The gelling agent is TYLOSE 30000 and polyvinyl alcohol matter
Amount is than being 1:The mixture of 1-2, the foaming agent are of animal or plant nature protide foaming agent, and the mushroom bran is vinegar slot；The improvement
The preparation method of agent is：Component in addition to foaming agent is mixed and is sufficiently stirred into emulsion form suspension, foaming agent is then added,
Foam in input foaming machine, when curing of the expanding foam solution in foaming machine a length of 10-20min.
2. alkaline land modifying agent according to claim 1, wherein the chelating agent is calcium phosphate, calcium citrate, cation
At least one of type polyacrylamide.
3. alkaline land modifying agent according to claim 1, the wherein average molecular weight of polyvinyl alcohol are 16000.
4. alkaline land modifying agent according to claim 1, wherein activator are tiny iron powder, at least one of sulphur powder.
5. alkaline land modifying agent according to claim 1, the wherein operating temperature of foaming machine are 20-30 DEG C, foaming machine
Injection pressure is 10-12MPa.
6. a kind of saline and alkali land improvement method, includes the following steps：(1) the weeds sundries in salt-soda soil is removed, deep ploughing 30-50cm is simultaneously
It digs；
(2) the foam-like modifying agent described in claim 1-5 is sent forth, the thickness of foam is 10-20cm, after being kept for 4-8 hours, then
It is secondary to turn over leveling；
(3) it sows, fertilising.
7. saline and alkali land improvement method according to claim 6 can also send modifying agent forth wherein in step 2, keep 4-8
Hour, after turning over leveling, eluted once or twice after 2-4 days.
8. the saline and alkali land improvement method described according to claim 6 or 7, wherein step 2 can repeatedly be carried out, until needed for reaching
Soil salinity and alkalinity, each interval time be 2-7 days.
9. the saline and alkali land improvement method described according to claim 6 or 7, wherein the weather of the modification method is when temperature is continuous
Stablize and lacks wind weather without rain at 20 DEG C or more.
10. saline and alkali land improvement method according to claim 6, wherein the floristics sowed is salt resistance alkali kind.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109504395A (en) * | 2018-12-26 | 2019-03-22 | 陕西省生物农业研究所 | A kind of alkaline land soil biological modification agent and its preparation method and application |
| CN109673196A (en) * | 2019-02-13 | 2019-04-26 | 内蒙古云农实业有限公司 | A kind of desert green administering method with husky sand control |
| CN113243281A (en) * | 2021-04-30 | 2021-08-13 | 中建八局第二建设有限公司 | Ecological drought xi system in sponge city saline and alkaline land |
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