CN109777440A - A kind of low-energy environment-friendly type saline-alkali soil conditioner and preparation method thereof - Google Patents
A kind of low-energy environment-friendly type saline-alkali soil conditioner and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of low-energy environment-friendly type saline-alkali soil conditioner and preparation method thereof, the low-energy environment-friendly type saline-alkali soil conditioner is made of the raw material of following parts by weight: 43~52 parts of fruit core powder, 27~31 parts of shrimp shell meal, 21~26 parts of the molten leaching ground-slag of polyhalite.Raw material used by low-energy environment-friendly type saline-alkali soil conditioner of the invention is the byproduct of each production line, at low cost, and low energy consumption for preparation process, therefore has the advantages that low power consuming, environmentally protective；And the sodium ion in saline-alkali soil can be effectively replaced, soil pH is reduced, and improve soil texture.
Description
Technical field
The present invention relates to alkaline land improving technical fields, and in particular to a kind of low-energy environment-friendly type saline-alkali soil conditioner and its
Preparation method.
Background technique
Saline-alkali soil is under the comprehensive function of various natural environments and human activity, and salt directly participates in the formation of soil
Journey, and the soil formed using salt (alkali) change process as leading role, be solonchak and alkaline earth and various salinization, alkali soil it is total
Claim.Saline-alkali soil contains great amount of soluble salt, easily forms stronger alkaline environment, influences the physiological function and normal life of crop
It is long, and destroy the problems such as soil aggregate structure easily leads to soil hardening, impeded drainage.Second of overall survey of soil data in China
It has been shown that, Chinese about 35.13 ten thousand km of the saline alkali land resource gross area2, with the growth of Chinese population and to grain and fiber requirements
Increase, future will need to plant greater area of saline and alkaline soil.
At this stage, the ameliorative measure in salt-soda soil can be roughly divided into chemical modifying, plant improvement, engineering measure improvement and farming
The improvement of measure.Chemical measure mainly has both sides improving effect: cohesion soil particle, improves soil texture and displacement soil
Exchangeable sodium promotes salt leaching；Plant improvement is that soil alkaline is reduced in growing process by planting salt-tolerant plant
Degree improves soil physico-chemical property；Engineering measure can be according to saline-alkali soil moisture-salt transport feature, by build related water conservancy projects with
The modes such as continuous pouring, interval pouring, spray carry out the desalinization of soil by flooding or leaching and salt discharge process in salt-soda soil；Tillage control measure mainly include it is no-tillage,
Deep ploughing, covering methods every salt measure and are leveled land, and can play the role of inhibiting the accumulation of salt in the surface soil.
Chemical modifying one of as alkaline land improving measure at this stage, have the characteristics that it is simple and efficient, according to modifying agent
Property can be divided into and be capable of providing Ca2+To replace Na on soil colloid+Calcic type modifying agent and soil can be neutralized, reduce
The acid modifying agent of soil pH value.Inorganic salts modifying agent occupies very big market percentage, wherein most widely used is exactly phosphorus stone
Cream, the calcium ion that dissolution generates can be swapped with the sodium ion in soil, and have certain energy for reducing soil pH value
Power, but it is little to the improvement of soil texture.Studies have shown that capillarity is held very much if soil does not have structure appropriate
Easily make deep layer salinity transfer and run up in surface soil again, leads to soil salination again.
Summary of the invention
For the above-mentioned prior art, the object of the present invention is to provide a kind of low-energy environment-friendly type saline-alkali soil conditioner and its systems
Preparation Method.Raw material used by low-energy environment-friendly type saline-alkali soil conditioner of the invention is the byproduct of each production line,
It is at low cost, and low energy consumption for preparation process, therefore have the advantages that low power consuming, environmentally protective；And it can effectively replace in saline-alkali soil
Sodium ion, reduce soil pH, and improve soil texture.
To achieve the above object, the present invention adopts the following technical scheme:
The first aspect of the present invention provides a kind of low-energy environment-friendly type saline-alkali soil conditioner, by the raw material of following parts by weight
It is made:
43~52 parts of fruit core powder, 27~31 parts of shrimp shell meal, 21~26 parts of the molten leaching ground-slag of polyhalite.
Preferably, the low-energy environment-friendly type saline-alkali soil conditioner, is made of the raw material of following parts by weight:
43 parts of fruit core powder, 31 parts of shrimp shell meal, 26 parts of the molten leaching ground-slag of polyhalite.
Preferably, the fruit core powder is by one of Chinese hawthorn seed, yellow peach core, almond and red bayberry core or a variety of, through dry
It is crushed after dry, sieving is made.It is furthermore preferred that smashing it through 100 meshes.
Preferably, the shrimp shell meal is to be prepared by the following method:
Shrimp shell crushed after being dried is sieved, dilute sulfuric acid to bubble-free is added to generate, low temperature drying forms shrimp shell meal.
It is furthermore preferred that smashing it through 100 meshes.
It is furthermore preferred that the concentration of the dilute sulfuric acid is 0.1mol/L, the calcium carbonate in shrimp shell can be removed.
Preferably, the molten leaching ground-slag of the polyhalite is to be prepared by the following method:
With polyhalite through the molten leaching of hot water, CaCl2Molten leaching, Ca (OH)2Filter residue after molten leaching or roasting potassium sulfate making is raw material,
It is sieved after broken, is dissolved in water and stirs 5min, dilute sulfuric acid is added to adjust pH value to continuing to stir 10min after 5~6, filtering drying,
Form the molten leaching ground-slag of polyhalite.
It is furthermore preferred that crossing 200 meshes after broken.
It is furthermore preferred that ratio of water to material is 5:1, add water can be by Cl in filter residue-Equal soluble ions dissolution filter falls.
It is furthermore preferred that the concentration of the dilute sulfuric acid is 0.1mol/L, play a part of to reduce the molten leaching slag pH value of polyhalite.
Above-mentioned fruit core is preferably the waste water fruit stone of the generations such as tinned fruit processing factory；Shrimp shell is preferably peeled shrimp processing factory
The discarded shrimp shell of equal generations；Above-mentioned raw materials are the byproduct of each production line, and cost of material is low, and are able to achieve to by-product
The recycling of product, it is economic and environment-friendly.
The second aspect of the present invention provides the preparation method of above-mentioned low-energy environment-friendly type saline-alkali soil conditioner, including following
Step:
(1) it will crush and sieve with 100 mesh sieve after the drying of fruit core, form fruit core powder；
(2) shrimp shell crushed after being dried is sieved with 100 mesh sieve, 0.1mol/L dilute sulfuric acid to bubble-free is added to generate, low temperature drying, shape
At shrimp shell meal；
(3) with polyhalite through the molten leaching of hot water, CaCl2Molten leaching, Ca (OH)2Filter residue after molten leaching or roasting potassium sulfate making is original
Material, be crushed after cross 200 meshes, be dissolved in water by the ratio of water to material of 5:1 and stir 5min, add 0.1mol/L dilute sulfuric acid adjust pH value to
Continue to stir 10min after 5~6, filtering drying forms the molten leaching ground-slag of polyhalite；
(4) fruit core powder, shrimp shell meal and the molten leaching ground-slag of polyhalite are uniformly mixed, that is, low-energy environment-friendly type salt is prepared
Alkali soil conditioner.
At least one of the third aspect of the present invention provides above-mentioned low-energy environment-friendly type saline-alkali soil conditioner following 1) -3)
In application:
1) alkaline land soil pH value and exchangeable sodium ion concentration are reduced；
2) promote the formation of alkaline land soil water stability macro aggregate；
3) water transmitting ability of alkaline land soil is improved.
The fourth aspect of the present invention provides a kind of modification method of alkaline land soil, comprising the following steps:
The described in any item low-energy environment-friendly type saline-alkali soil of claim 1-7 are applied according to 100~150kg/ mus of amount of application
Earth modifying agent, by 10~20cm of Soil tillage.
Beneficial effects of the present invention:
(1) low-energy environment-friendly type saline-alkali soil conditioner of the invention can effectively replace sodium ion, reduce salt affected soil pH, promote
It formed into crumb structure, improve soil hydraulic ability, persistently effective improvement salt-soda soil.By selecting particular kind of fruit
Core is ground into specific mesh number, and the initial stage being manured into soil can increase interstices of soil using its hardness and granular size；?
The later period is applied, can be organic colloid by the organic matter decomposition and inversion in fruit core powder and shrimp shell with the activity of microorganism, from
And promotes the formation of soil aggregate structure, improve soil texture and improve water transmitting ability.The adjustable C/N of albumen in shrimp shell
Than the small-molecular peptides of hydrolysis also can promote the growth of microorganism and plant.The molten leaching slag ingredient of polyhalite is with CaSO4And MgSO4
Based on, calcium ions and magnesium ions can be improved the ion-exchange capacity of soil and replace sodium, and element sulphur then promotes plant growth, and water-soluble
It is limited to keep improved effect more longlasting.
(2) raw material used by low-energy environment-friendly type saline-alkali soil conditioner of the present invention are the by-products of each production line
Product, and low energy consumption for preparation process, by utilizing industry byproduct, reduces production cost, while avoiding the wasting of resources and ring
Border pollution, has the advantages that low energy consumption, environmentally protective.
Specific embodiment
Following detailed description is all illustrative, it is intended to provide further instruction to the application.
As background technology part introduction, existing salt-soda soil chemical improvement agent is set mainly using ardealite
The significant effect of exchangeable sodium ion is changed, and there is the ability of certain reduction soil pH value, but the improvement to soil texture
It has little effect；And if soil, without structure appropriate, capillarity is easy to make deep layer salinity transfer and runs up to surface soil again
On, lead to soil salination again.
Based on this, the object of the present invention is to provide one kind can reduce saline-alkali soil pH value and basicity, while can improve
The modifying agent of soil texture.
It is of the invention innovative using fruit core powder, shrimp shell meal and polyhalite three kinds of substances of molten leaching ground-slag as raw material, preparation
Form a kind of low-energy environment-friendly type saline-alkali soil conditioner.Each raw material component is an organic whole, indispensable, between raw material
With collaboration facilitation.Wherein, fruit core and shrimp shell are food processing byproducts, are rich in organic matter, can increase soil
In organic colloid；It is used in mixed way adjustable C/N ratio, promotes microbial reproduction growth；The hypha,hyphae of formation can surround greatly
Aggregate is so as to improve soil texture, and aggregate stability also increases with the increase of the content of organic matter；By promoting soil
Earth formation of the agglomerates reaches improvement structure, improves the effect of water transmitting ability.
Polyhalite (K2SO4·MgSO4·2CaSO4·2H2O the molten leaching (K of hot water) can be passed through2SO4·MgSO4·2CaSO4·
2H2O→2K++Mg2++2Ca2++4SO4 2-+2H2O)、CaCl2Molten leaching (K2SO4·MgSO4·2CaSO4·2H2O+2Ca2+→
4CaSO4↓+2K++Mg2++SO4 2-+2H2O)、Ca(OH)2Molten leaching (K2SO4·MgSO4·2CaSO4·2H2O+2Ca2++2OH-→
4CaSO4↓+Mg(OH)2↓+2K++2H2O) or roasting (K2SO4·MgSO4·2CaSO4·2H2O→K2SO4+MgSO4+2CaSO4+
2H2O ↑) potassium sulfate making, molten leaching slag is with CaSO4Based on, and contain the undissolved MgSO in part4, can enhance soil from
Sub- exchange capacity replaces the exchangeable sodium ion in soil with this, the pH value of saline-alkali soil can also be reduced after being acid hydrolysis.
The present invention during the test, successively by originals such as " fruit core powder ", " shrimp shell meal " and " the molten leaching ground-slag of polyhalite "
Material component is removed, and saline-alkali soil conditioner is prepared.Then the saline-alkali soil conditioner of preparation is mixed with saline-alkali soil, is carried out
Native column experiment tests it to salt affected soil pH value, basicity (ESP), water-stable aggregate score and saturation water guide respectively
The function and effect of rate, as a result, it has been found that, compared with saline-alkali soil conditioner of the invention, deleting any raw material components can all be shown
Writing reduces it to salt affected soil pH, basicity (ESP), water-stable aggregate score and saturated hydraulic conductivity one or more index
Improvement.
To sum up, the present invention is prepared low-energy environment-friendly type salt affected soil and is changed by the optimization of selection and dosage to raw material
Good dose.Soil pH value can not only be effectively reduced in it, replace the sodium ion in saline-alkali soil；It also can effectively improve soil texture, improve
Soil hydraulic ability, persistently effectively improves salt-soda soil.
In order to enable those skilled in the art can clearly understand the technical solution of the application, below with reference to tool
The technical solution of the application is described in detail in the embodiment of body.
Test material used in the embodiment of the present invention and comparative example is the test material of this field routine, can be passed through
Commercial channel is commercially available.
Embodiment 1: the preparation of low-energy environment-friendly type saline-alkali soil conditioner
(1) it crushes and sieves with 100 mesh sieve after drying Chinese hawthorn seed, form fruit core powder；
(2) it crushes and sieves with 100 mesh sieve after drying shrimp shell, be added after reaction kettle I plus 0.1mol/L dilute sulfuric acid is raw to bubble-free
At low temperature drying forms shrimp shell meal；
(3) the molten leaching slag of polyhalite (the molten leaching of hot water) is crossed into 200 meshes after broken crusher machine, be added in reaction kettle II
It is dissolved in water afterwards by the ratio of water to material of 5:1 and stirs 5min, 0.1mol/L dilute sulfuric acid is added to adjust pH value to continuing to stir after 5~6
10min, filtering drying form the molten leaching ground-slag of polyhalite；
It (4) is 48:29:23 according to weight ratio by the fruit core powder of above-mentioned preparation, shrimp shell meal and the molten leaching ground-slag of polyhalite
It is sufficiently mixed, forms low-energy environment-friendly type saline-alkali soil conditioner.
Embodiment 2: the preparation of low-energy environment-friendly type saline-alkali soil conditioner
(1) it will crush and sieve with 100 mesh sieve after the drying of yellow peach core, form fruit core powder；
(2) it crushes and sieves with 100 mesh sieve after drying shrimp shell, add 0.01mol/L dilute sulfuric acid after reaction kettle I is added, low temperature dries
It is dry, form shrimp shell meal；
(3) by the molten leaching slag (CaCl of polyhalite2Molten leaching) 200 meshes, addition reaction kettle II are crossed after broken crusher machine
In after be dissolved in water by the ratio of water to material of 5:1 and stir 5min, add 0.1mol/L dilute sulfuric acid to adjust pH value to continuing to stir after 5~6
10min, filtering drying form the molten leaching ground-slag of polyhalite；
It (4) is 43:31:26 according to weight ratio by the fruit core powder of above-mentioned preparation, shrimp shell meal and the molten leaching ground-slag of polyhalite
It is sufficiently mixed, forms low-energy environment-friendly type saline-alkali soil conditioner.
Embodiment 3: the preparation of low-energy environment-friendly type saline-alkali soil conditioner
(1) it crushes and sieves with 100 mesh sieve after drying almond, form fruit core powder；
(2) it crushes and sieves with 100 mesh sieve after drying shrimp shell, add 0.01mol/L dilute sulfuric acid after reaction kettle I is added, low temperature dries
It is dry, form shrimp shell meal；
(3) by the molten leaching slag of polyhalite (Ca (OH)2Molten leaching) 200 meshes, addition reaction kettle are crossed after broken crusher machine
It is dissolved in water after in II by the ratio of water to material of 5:1 and stirs 5min, 0.1mol/L dilute sulfuric acid is added to adjust pH value to continuing to stir after 5~6
10min is mixed, filtering drying forms the molten leaching ground-slag of polyhalite；
It (4) is 52:27:21 according to weight ratio by the fruit core powder of above-mentioned preparation, shrimp shell meal and the molten leaching ground-slag of polyhalite
It is sufficiently mixed, forms low-energy environment-friendly type saline-alkali soil conditioner.
Comparative example 1:
(1) it will crush and sieve with 100 mesh sieve after the drying of yellow peach core, form fruit core powder；
(2) it crushes and sieves with 100 mesh sieve after drying shrimp shell, be added after reaction kettle I plus 0.1mol/L dilute sulfuric acid is raw to bubble-free
At low temperature drying forms shrimp shell meal；
(3) the fruit core powder of above-mentioned preparation, shrimp shell meal are sufficiently mixed according to weight ratio for 43:31, form salt affected soil
Modifying agent A.
Comparative example 2:
(1) it will crush and sieve with 100 mesh sieve after the drying of yellow peach core, form fruit core powder；
(2) by the molten leaching slag (CaCl of polyhalite2Molten leaching) 200 meshes, addition reaction kettle II are crossed after broken crusher machine
In after be dissolved in water by the ratio of water to material of 5:1 and stir 5min, add 0.1mol/L dilute sulfuric acid to adjust pH value to continuing to stir after 5~6
10min, filtering drying form the molten leaching ground-slag of polyhalite；
(3) the molten leaching ground-slag of fruit core powder, polyhalite of above-mentioned preparation is sufficiently mixed according to weight ratio for 43:26, shape
At saline-alkali soil conditioner B.
Comparative example 3:
(1) it crushes and sieves with 100 mesh sieve after drying shrimp shell, be added after reaction kettle I plus 0.1mol/L dilute sulfuric acid is raw to bubble-free
At low temperature drying forms shrimp shell meal；
(2) by the molten leaching slag (CaCl of polyhalite2Molten leaching) 200 meshes, addition reaction kettle II are crossed after broken crusher machine
In after be dissolved in water by the ratio of water to material of 5:1 and stir 5min, add 0.1mol/L dilute sulfuric acid to adjust pH value to continuing to stir after 5~6
10min, filtering drying form the molten leaching ground-slag of polyhalite；
(3) shrimp shell meal of above-mentioned preparation, the molten leaching ground-slag of polyhalite are sufficiently mixed according to weight ratio for 31:26, are formed
Saline-alkali soil conditioner C.
Test example:
1. test method:
Saline-alkali soil conditioner prepared by embodiment 1-3 and comparative example 1-3, and individually fruit core powder, shrimp shell meal,
The molten leaching ground-slag of polyhalite mixed with saline-alkali soil (mass ratio of saline-alkali soil and modifying agent be 220:1, blank be it is untreated saline and alkaline
Soil) carry out native column experiment.Salt affected soil pH value, ESP value (basicity), water-stable aggregate score and saturation are tested respectively
The situation of change of hydraulic conductivity.
2. test result:
Test result is shown in Table 1.
Table 1: earth pillar elutes experimental result
| Processing | PH value | ESP value | Water stability macro aggregate score | Saturated hydraulic conductivity |
| Embodiment 1 | - 0.80 unit | - 10.97% | + 128.43% | + 18.53% |
| Embodiment 2 | - 0.85 unit | - 11.48% | + 133.18% | + 21.24% |
| Embodiment 3 | - 0.76 unit | - 10.23% | + 141.74% | + 22.47% |
| Comparative example 1 | - 0.58 unit | - 1.97% | + 147.32% | + 23.73% |
| Comparative example 2 | - 0.89 unit | - 12.11% | + 37.89% | + 13.12% |
| Comparative example 3 | - 0.92 unit | - 12.43% | + 92.25% | + 14.31% |
| Fruit core powder | - 0.34 unit | - 1.08% | + 53.57% | + 15.18% |
| Shrimp shell meal | - 0.72 unit | - 2.13% | + 116.83% | + 19.25% |
| The molten leaching ground-slag of polyhalite | - 0.97 unit | - 13.37% | - 2.74% | + 9.27% |
Note: experimental result is obtained compared with clear data., reduce；+, it improves.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of low-energy environment-friendly type saline-alkali soil conditioner, which is characterized in that be made of the raw material of following parts by weight:
43~52 parts of fruit core powder, 27~31 parts of shrimp shell meal, 21~26 parts of the molten leaching ground-slag of polyhalite.
2. low-energy environment-friendly type saline-alkali soil conditioner according to claim 1, which is characterized in that by the original of following parts by weight
Material is made:
43 parts of fruit core powder, 31 parts of shrimp shell meal, 26 parts of the molten leaching ground-slag of polyhalite.
3. low-energy environment-friendly type saline-alkali soil conditioner according to claim 1 or 2, which is characterized in that the fruit core powder
It is by one of Chinese hawthorn seed, yellow peach core, almond and red bayberry core or a variety of, crushes after drying, being sieved is made.
4. low-energy environment-friendly type saline-alkali soil conditioner according to claim 1 or 2, which is characterized in that the shrimp shell meal is
It is prepared by the following method:
Shrimp shell crushed after being dried is sieved, dilute sulfuric acid to bubble-free is added to generate, low temperature drying forms shrimp shell meal.
5. low-energy environment-friendly type saline-alkali soil conditioner according to claim 4, which is characterized in that smash it through 100 meshes；
The concentration of the dilute sulfuric acid is 0.1mol/L.
6. low-energy environment-friendly type saline-alkali soil conditioner according to claim 1 or 2, which is characterized in that the polyhalite is molten
Leaching ground-slag is to be prepared by the following method:
With polyhalite through the molten leaching of hot water, CaCl2Molten leaching, Ca (OH)2Filter residue after molten leaching or roasting potassium sulfate making is raw material, is crushed
After be sieved, be dissolved in water and stir 5min, add dilute sulfuric acid to adjust pH value to continuing after 5~6 to stir 10min, filtering drying is formed
The molten leaching ground-slag of polyhalite.
7. low-energy environment-friendly type saline-alkali soil conditioner according to claim 6, which is characterized in that cross 200 meshes after broken；
Ratio of water to material is 5:1；The concentration of the dilute sulfuric acid is 0.1mol/L.
8. the preparation method of the described in any item low-energy environment-friendly type saline-alkali soil conditioners of claim 1-7, which is characterized in that packet
Include following steps:
(1) it will crush and sieve with 100 mesh sieve after the drying of fruit core, form fruit core powder；
(2) shrimp shell crushed after being dried is sieved with 100 mesh sieve, 0.1mol/L dilute sulfuric acid to bubble-free is added to generate, low temperature drying forms shrimp
Shell powder；
(3) with polyhalite through the molten leaching of hot water, CaCl2Molten leaching, Ca (OH)2Filter residue after molten leaching or roasting potassium sulfate making is raw material, is broken
200 meshes are crossed after broken, is dissolved in water by the ratio of water to material of 5:1 and stirs 5min, and 0.1mol/L dilute sulfuric acid is added to adjust pH value to 5~6
After continue stir 10min, filtering drying, formed the molten leaching ground-slag of polyhalite；
(4) fruit core powder, shrimp shell meal and the molten leaching ground-slag of polyhalite are uniformly mixed, that is, low-energy environment-friendly type saline-alkali soil is prepared
Earth modifying agent.
9. the described in any item low-energy environment-friendly type saline-alkali soil conditioners of claim 1-7 are following 1) -3) at least one of in
Using:
1) alkaline land soil pH value and exchangeable sodium ion concentration are reduced；
2) promote the formation of alkaline land soil water stability macro aggregate；
3) water transmitting ability of alkaline land soil is improved.
10. a kind of modification method of alkaline land soil, which comprises the following steps:
The described in any item low-energy environment-friendly type salt affected soils of claim 1-7 are applied according to 100~150kg/ mus of amount of application to change
Good dose, by 10~20cm of Soil tillage.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103013529A (en) * | 2012-01-04 | 2013-04-03 | 清华大学 | Soil improvement agent and processing method thereof |
| CN103012016A (en) * | 2012-01-04 | 2013-04-03 | 清华大学 | Modifier for mildly alkalized soil and processing method thereof |
| CN103031129A (en) * | 2012-01-04 | 2013-04-10 | 清华大学 | Conditioner for severely alkaline soil and processing method of conditioner |
| CN103031130A (en) * | 2012-01-04 | 2013-04-10 | 清华大学 | Conditioner for moderately alkaline soil and processing method of conditioner |
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2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103013529A (en) * | 2012-01-04 | 2013-04-03 | 清华大学 | Soil improvement agent and processing method thereof |
| CN103012016A (en) * | 2012-01-04 | 2013-04-03 | 清华大学 | Modifier for mildly alkalized soil and processing method thereof |
| CN103031129A (en) * | 2012-01-04 | 2013-04-10 | 清华大学 | Conditioner for severely alkaline soil and processing method of conditioner |
| CN103031130A (en) * | 2012-01-04 | 2013-04-10 | 清华大学 | Conditioner for moderately alkaline soil and processing method of conditioner |
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