CN109134141A - A kind of preparation method of salt-soda soil biological modification agent - Google Patents
A kind of preparation method of salt-soda soil biological modification agent Download PDFInfo
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- CN109134141A CN109134141A CN201810996560.5A CN201810996560A CN109134141A CN 109134141 A CN109134141 A CN 109134141A CN 201810996560 A CN201810996560 A CN 201810996560A CN 109134141 A CN109134141 A CN 109134141A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C11/00—Other nitrogenous fertilisers
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention belongs to technical field of land improvement, and in particular to a kind of preparation method of salt-soda soil biological modification agent.The present invention uses hole flourishing first, organic matter leaf mould abundant is as raw material, it is activated by surfactant, it is squeezed with additive again, additive is set to combine closely with raw material by being added, in pre- carbonization process, sulphur in additive forms sulfide, it is trapped in extruding, and pre- charing particle is adsorbed on by magnetic iron oxide well, pass through the absorption to sulfide, again and after the mixing of mixed biologic liquid, it can be very good to adsorb microorganism therein, load, and by Geniposide to enzyme therein, strain carries out crosslinking curing, finally mixed with additive, the water retention property of soil can be effectively increased by additive, the improved effect to soil can be increased using other auxiliary materials.
Description
Technical field
The invention belongs to technical field of land improvement, and in particular to a kind of preparation method of salt-soda soil biological modification agent.
Background technique
Salt-soda soil is a type of salt aggregation, refers to that salinity contained by soil the inside influences the normal life of crop
It is long, the formation of China's alkaline earth and alkali-affected soil, it is most of with Carbonates In Soil add up it is related, thus basicity generally compared with
Height, serious salt affected soil regional plant can hardly survive.Currently, the improvement for saline-alkali soil, chemical modifying be it is a kind of compared with
For tradition and apply relatively wide measure.Chemical modifying is exactly the property that salt-soda soil is improved using some acid salts substances
Matter reduces the pH value of soil, increases the cation exchange capacity (CEC) of soil, reduces the salt content of soil.Chemical modifying is taken
Between it is short, improved effect is significant, and strong alkali-affected soil is more suitable for.Currently, domestic and international common salt-soda soil chemical improvement agent one
As have following three classes: first is that calcareous material, such as gypsum, ardealite, desulfurized gypsum, calcium chloride, calcium superphosphate；Second class is acid
Property substance, such as sulfuric acid, ferrous sulfate, sulphur, phosphoric acid, hydrochloric acid, humic acid, fulvic acid and weathered coal；Third class is that polymerization has
Machine modifying agent, such as polyacrylamide.Existing saline and alkaline modification method is by largely filling the water or using a large amount of soil moved in improve the originals in the market
The mode of backfill, this method one side project amount is larger, higher cost, is on the other hand easy in the salt and alkali component of underground enrichment
Surface is gradually reverted to, the plant of surface plantation is impacted, and only focus on the improvement to soil, is ignored to soil
Fertilizing and the salt resistance ability for improving crop, while the anti-saline and alkaline phenomenon of soil is serious after improvement.It is suitble to fit extensively therefore, it is necessary to one kind
With the preparation method of the lasting alkaline land improving of effect, auxiliary improves the plant growth planted on salt-soda soil.
Summary of the invention
The technical problems to be solved by the invention: it is poor for current alkaline land modifying agent improved effect, it long-acting cannot improve
The problem of salt-soda soil, provides a kind of preparation method of salt-soda soil biological modification agent.
In order to solve the above technical problems, the present invention is using technical solution as described below:
A kind of preparation method of salt-soda soil biological modification agent, the preparation method include the following steps:
(1) leaf mould, surfactant 9~12:1 in mass ratio are taken, is uniformly mixed, ball milling is carried out, ball milling object is collected, by ball milling
Object, additive 10~13:1 in mass ratio are uniformly mixed, and are put into a press and are squeezed, and extrudate is collected；
(2) extrudate is put into retort and is carbonized in advance, collected pre- charing particle, crush, sieving, collect sieving particle,
Sieving particle is mixed with mixed biologic liquid 2~4:9~13 in mass ratio, is stood；
(3) after wait stand, add mixed biologic liquid quality 30~40% nutrient solution and mixed biologic liquid quality 7~
11% Geniposide stirs, and dried object is collected in freeze-drying, crushes, sieving, collects sieving particle A；
(4) according to parts by weight, 80~85 parts of sieving particle A, 40~45 parts of doses, 20~25 parts of discarded mushroom bacteria sticks, 8 are taken
~10 parts of sodium sulphate, 6~8 parts of magnesium sulfate, are stirred to get salt-soda soil biological modification agent.
Surfactant is sorbitan fatty acid ester, any one in sucrose fatty ester in the step (1).
Additive is that sulphur, magnetic iron oxide 6~8:1 in mass ratio are uniformly mixed to get addition in the step (1)
Agent.
Pre- carbonization condition in the step (2) are as follows: at 100~130 DEG C, 1~3h is kept the temperature, at 200~230 DEG C, heat preservation 2~
4h。
In the step (2) mixed biologic liquid the preparation method comprises the following steps: peat soil is adjusted water content to 70~80%, it is natural
It places 2~4 days, collects the peat soil after placing, according to parts by weight, the mud after taking 120~150 parts of water, 40~45 parts of placements
Charcoal soil, 20~25 portions of beef extracts, 10~15 portions of sucrose, 3~6 parts of sodium chloride, are stirred, at 25~35 DEG C place 30~
35h, and pH to 3.0~4.0 is adjusted using sulfuric acid solution, after placement, filtering collects filtrate to get mixed biologic liquid.
In the step (2) nutrient solution be according to the mass fraction, take 160~180 parts of water, 30~35 parts of peptones, 18~
23 parts of yeast extracts, 10~15 parts of glucose, are stirred, sterilizing is to get nutrient solution.
Dose the preparation method comprises the following steps: according to the mass fraction, taking 140~170 parts of water, 20~25 parts in the step (4)
Vermiculite, 10~15 parts of bacillus subtilises, 6~8 parts of glucose, 5~9 parts of polyglutamic acids, 1~3 part of sodium sulphate, 1~3 part of chlorination
Sodium stirs, freeze-drying, collects dried object to get dose.
The present invention is compared with other methods, and advantageous effects are:
(1) present invention use hole prosperity, organic matter leaf mould abundant as raw material first, by surfactant to its into
Row activation, then it is squeezed with additive, so that additive is combined closely with raw material by being added, in pre- carbonization process
In, the sulphur in additive forms sulfide, is trapped in extruding, and be adsorbed on pre- charing well by magnetic iron oxide
Grain, by the absorption to sulfide, then with after the mixing of mixed biologic liquid, can be very good to inhale microorganism therein
It is attached, load, and crosslinking curing is carried out to enzyme therein, strain by Geniposide, it is finally mixed with additive, by adding
Add agent that can effectively increase the water retention property of soil, the improved effect to soil can be increased using other auxiliary materials；
(2) present invention is carbonized using the extruding to leaf mould, first is that increasing its absorption property, is inhaled to the metal in soil
It is attached, second is that making to be pyrolyzed inside it using pre- charing, increase active group, improve the capturing ability to substance, increase with it is micro-
The combination of biology, secondly the present invention is made using its internal microorganism system abundant using sulfuric acid using peat soil as bacterium source
With acid-base modifier, increase it by sulfuric acid adaptability and fixed performance, can be very good to be applied to soil improvement；
(3) present invention using polyglutamic acid by being wrapped up using vermiculite load bacillus subtilis, in use,
It is lasting that polyglutamic acid is supplemented by the effect of internal bacillus subtilis, increase the lasting water retention property of soil, and
And vermiculite granule therein can be very good to adjust soil.
Specific embodiment
Surfactant is sorbitan fatty acid ester, any one in sucrose fatty ester；
Additive is that sulphur, magnetic iron oxide 6~8:1 in mass ratio are uniformly mixed to get additive；
Mixed biologic liquid the preparation method comprises the following steps: peat soil is adjusted water content to 70~80%, placement 2~4 days naturally, collection is put
The peat soil postponed, according to parts by weight, peat soil, 20~25 parts of beef after taking 120~150 parts of water, 40~45 parts of placements
Cream, 10~15 portions of sucrose, 3~6 parts of sodium chloride, are stirred, and 30~35h are placed at 25~35 DEG C, and use sulfuric acid solution
PH to 3.0~4.0 is adjusted, after placement, filtering collects filtrate to get mixed biologic liquid；
Nutrient solution be according to the mass fraction, take 160~180 parts of water, 30~35 parts of peptones, 18~23 parts of yeast extracts, 10~
15 parts of glucose, are stirred, sterilizing is to get nutrient solution；
Dose the preparation method comprises the following steps: according to the mass fraction, taking 140~170 parts of water, 20~25 parts of vermiculites, 10~15 portions of withered grass
Bacillus, 6~8 parts of glucose, 5~9 parts of polyglutamic acids, 1~3 part of sodium sulphate, 1~3 part of sodium chloride stir 20min, freezing
It is dry, dried object is collected to get dose；
A kind of preparation method of salt-soda soil biological modification agent, the preparation method include the following steps:
(1) leaf mould, surfactant 9~12:1 in mass ratio are taken, is uniformly mixed, ball milling 30min is carried out with 600r/min, is received
Collect ball milling object, ball milling object, additive 10~13:1 in mass ratio are uniformly mixed, puts into a press, is squeezed with 10MPa
10min collects extrudate；
(2) extrudate is put into retort and is carbonized in advance, pre- carbonization condition are as follows: at 100~130 DEG C, 1~3h is kept the temperature,
200~230 DEG C, keep the temperature 2~4h, collect pre- charing particle, crush, cross 200 meshes, collect sieving particle, will sieving particle with
Mixed biologic liquid 2~4:9 in mass ratio~13 mixing, stands 10~15h at 28~35 DEG C；
(3) after wait stand, add mixed biologic liquid quality 30~40% nutrient solution and mixed biologic liquid quality 7~
11% Geniposide stirs 1~3h with 300r/min, and dried object is collected in freeze-drying, is crushed, and 300 meshes are crossed, and collects sieving
Particle A；
(4) according to parts by weight, 80~85 parts of sieving particle A, 40~45 parts of doses, 20~25 parts of discarded mushroom bacteria sticks, 8 are taken
~10 parts of sodium sulphate, 6~8 parts of magnesium sulfate, are stirred to get salt-soda soil biological modification agent.
Embodiment 1
Surfactant is sucrose fatty ester；
Additive is that sulphur, magnetic iron oxide 8:1 in mass ratio are uniformly mixed to get additive；
Mixed biologic liquid the preparation method comprises the following steps: peat soil is adjusted water content to 80%, place 4 days naturally, after collecting placement
Peat soil, according to parts by weight, peat soil, 25 portions of beef extracts, 15 portions of sucrose, 6 parts of chlorinations after taking 150 parts of water, 45 parts of placements
Sodium is stirred, and 35h is placed at 35 DEG C, and adjust pH to 4.0 using sulfuric acid solution, after placement, filter is collected in filtering
Liquid is to get mixed biologic liquid；
Nutrient solution is according to the mass fraction, to take 180 parts of water, 35 parts of peptones, 23 parts of yeast extracts, 15 parts of glucose, and stirring is mixed
It closes, sterilizing is to get nutrient solution；
Dose the preparation method comprises the following steps: according to the mass fraction, taking 170 parts of water, 25 parts of vermiculites, 15 parts of bacillus subtilises, 8 parts of Portugals
Grape sugar, 9 parts of polyglutamic acids, 3 parts of sodium sulphate, 3 parts of sodium chloride, stir 20min, and freeze-drying collects dried object to get increase
Agent；
A kind of preparation method of salt-soda soil biological modification agent, the preparation method include the following steps:
(1) leaf mould, surfactant 12:1 in mass ratio are taken, is uniformly mixed, ball milling 30min is carried out with 600r/min, is collected
Ball milling object, additive 13:1 in mass ratio are uniformly mixed, put into a press by ball milling object, carry out extruding 10min with 10MPa, receive
Collect extrudate；
(2) extrudate is put into retort and is carbonized in advance, pre- carbonization condition are as follows: at 130 DEG C, keep the temperature 3h, at 230 DEG C, protect
Warm 4h collects pre- charing particle, crushes, cross 200 meshes, collect sieving particle, sieving particle and mixed biologic liquid are pressed quality
It is mixed than 4:13, stands 15h at 235 DEG C；
(3) after wait stand, the nutrient solution of mixed biologic liquid quality 40% and the capital of mixed biologic liquid quality 11% are added
Buddhist nun is flat, stirs 3h with 300r/min, and dried object is collected in freeze-drying, is crushed, and 300 meshes are crossed, and collects sieving particle A；
(4) according to parts by weight, 85 parts of sieving particle A, 45 parts of doses, 25 parts of discarded mushroom bacteria sticks, 10 parts of sodium sulphate, 8 are taken
Part magnesium sulfate, is stirred to get salt-soda soil biological modification agent.
Embodiment 2
Surfactant is sucrose fatty ester；
Additive is that sulphur, magnetic iron oxide 7:1 in mass ratio are uniformly mixed to get additive；
Mixed biologic liquid the preparation method comprises the following steps: peat soil is adjusted water content to 75%, place 3 days naturally, after collecting placement
Peat soil, according to parts by weight, peat soil, 23 portions of beef extracts, 13 portions of sucrose, 5 parts of chlorinations after taking 140 parts of water, 43 parts of placements
Sodium is stirred, and 33h is placed at 29 DEG C, and adjust pH to 3.5 using sulfuric acid solution, after placement, filter is collected in filtering
Liquid is to get mixed biologic liquid；
Nutrient solution is according to the mass fraction, to take 170 parts of water, 33 parts of peptones, 21 parts of yeast extracts, 13 parts of glucose, and stirring is mixed
It closes, sterilizing is to get nutrient solution；
Dose the preparation method comprises the following steps: according to the mass fraction, taking 150 parts of water, 23 parts of vermiculites, 13 parts of bacillus subtilises, 7 parts of Portugals
Grape sugar, 8 parts of polyglutamic acids, 2 parts of sodium sulphate, 2 parts of sodium chloride, stir 20min, and freeze-drying collects dried object to get increase
Agent；
A kind of preparation method of salt-soda soil biological modification agent, the preparation method include the following steps:
(1) leaf mould, surfactant 10:1 in mass ratio are taken, is uniformly mixed, ball milling 30min is carried out with 600r/min, is collected
Ball milling object, additive 12:1 in mass ratio are uniformly mixed, put into a press by ball milling object, carry out extruding 10min with 10MPa, receive
Collect extrudate；
(2) extrudate is put into retort and is carbonized in advance, pre- carbonization condition are as follows: at 120 DEG C, keep the temperature 2h, at 220 DEG C, protect
Warm 3h collects pre- charing particle, crushes, cross 200 meshes, collect sieving particle, sieving particle and mixed biologic liquid are pressed quality
It is mixed than 3:11, stands 13h at 32 DEG C；
(3) after wait stand, the nutrient solution of mixed biologic liquid quality 35% and the capital Buddhist nun of mixed biologic liquid quality 9% are added
It is flat, 2h is stirred with 300r/min, dried object is collected in freeze-drying, is crushed, and 300 meshes are crossed, and collects sieving particle A；
(4) according to parts by weight, 83 parts of sieving particle A, 43 parts of doses, 23 parts of discarded mushroom bacteria sticks, 9 parts of sodium sulphate, 7 parts are taken
Magnesium sulfate is stirred to get salt-soda soil biological modification agent.
Embodiment 3
Surfactant is sorbitan fatty acid ester；
Additive is that sulphur, magnetic iron oxide 6:1 in mass ratio are uniformly mixed to get additive；
Mixed biologic liquid the preparation method comprises the following steps: peat soil is adjusted water content to 70%, place 2 days naturally, after collecting placement
Peat soil, according to parts by weight, peat soil, 20 portions of beef extracts, 10 portions of sucrose, 3 parts of chlorinations after taking 120 parts of water, 40 parts of placements
Sodium is stirred, and 30h is placed at 25 DEG C, and adjust pH to 3.0 using sulfuric acid solution, after placement, filter is collected in filtering
Liquid is to get mixed biologic liquid；
Nutrient solution is according to the mass fraction, to take 160 parts of water, 30 parts of peptones, 18 parts of yeast extracts, 10 parts of glucose, and stirring is mixed
It closes, sterilizing is to get nutrient solution；
Dose the preparation method comprises the following steps: according to the mass fraction, taking 140 parts of water, 20 parts of vermiculites, 10 parts of bacillus subtilises, 6 parts of Portugals
Grape sugar, 5 parts of polyglutamic acids, 1 part of sodium sulphate, 1 part of sodium chloride, stir 20min, and freeze-drying collects dried object to get increase
Agent；
A kind of preparation method of salt-soda soil biological modification agent, the preparation method include the following steps:
(1) leaf mould, surfactant 9:1 in mass ratio are taken, is uniformly mixed, ball milling 30min is carried out with 600r/min, collects ball
Object is ground, ball milling object, additive 10:1 in mass ratio are uniformly mixed, put into a press, extruding 10min is carried out with 10MPa, is collected
Extrudate；
(2) extrudate is put into retort and is carbonized in advance, pre- carbonization condition are as follows: at 100 DEG C, keep the temperature 1h, at 200 DEG C, protect
Warm 2h collects pre- charing particle, crushes, cross 200 meshes, collect sieving particle, sieving particle and mixed biologic liquid are pressed quality
It is mixed than 2:9, stands 10h at 28 DEG C；
(3) after wait stand, the nutrient solution of mixed biologic liquid quality 30% and the capital Buddhist nun of mixed biologic liquid quality 7% are added
It is flat, 1h is stirred with 300r/min, dried object is collected in freeze-drying, is crushed, and 300 meshes are crossed, and collects sieving particle A；
(4) according to parts by weight, 80 parts of sieving particle A, 40 parts of doses, 20 parts of discarded mushroom bacteria sticks, 8 parts of sodium sulphate, 6 parts are taken
Magnesium sulfate is stirred to get salt-soda soil biological modification agent.
Comparative example 1
It is substantially the same manner as Example 2, only the difference is that lacking sieving particle A.
Comparative example 2
It is substantially the same manner as Example 2, only the difference is that lacking dose.
Comparative example 3
Commercially available alkaline land modifying agent.
The modifying agent prepared in embodiment 1,2,3 and comparative example 1,2,3 is tested in a certain salt-soda soil, dilution 12
It is uniformly sprayed onto the soil in experiment greenhouse again, then ploughs deeply a soil using rotary cultivator, change the salt-soda soil
Good dose is sufficiently mixed with soil；Then a water is poured in 3 days, then normal plantation cucumber, embodiment 1,2,3 and comparative example 1,2,
The changes of soil properties situation and plant growth situation of 3 measurements are shown in Table 1.
Table 1:
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Salt content % | 2.5 | 2.6 | 2.5 | 4.2 | 3.0 | 3.0 |
| PH value | 7.3 | 7.0 | 7.4 | 8.2 | 7.8 | 7.8 |
| The content of organic matter | 17.5 | 9.0 | 17.9 | 9.2 | 13.9 | 15.7 |
| Crop growing state | Well | Well | Well | Growing way is slow, and plant is small | Growing way is general | Growing way is general |
As shown in Table 1, salt-soda soil biological modification agent prepared by the present invention can effectively reinforce improved effect, and effect is durable,
Be worth promoting use.
Claims (7)
1. a kind of preparation method of salt-soda soil biological modification agent, which is characterized in that the preparation method includes the following steps:
(1) leaf mould, surfactant 9~12:1 in mass ratio are taken, is uniformly mixed, ball milling is carried out, ball milling object is collected, by ball milling
Object, additive 10~13:1 in mass ratio are uniformly mixed, and are put into a press and are squeezed, and extrudate is collected；
(2) extrudate is put into retort and is carbonized in advance, collected pre- charing particle, crush, sieving, collect sieving particle,
Sieving particle is mixed with mixed biologic liquid 2~4:9~13 in mass ratio, is stood；
(3) after wait stand, add mixed biologic liquid quality 30~40% nutrient solution and mixed biologic liquid quality 7~
11% Geniposide stirs, and dried object is collected in freeze-drying, crushes, sieving, collects sieving particle A；
(4) according to parts by weight, 80~85 parts of sieving particle A, 40~45 parts of doses, 20~25 parts of discarded mushroom bacteria sticks, 8 are taken
~10 parts of sodium sulphate, 6~8 parts of magnesium sulfate, are stirred to get salt-soda soil biological modification agent.
2. the preparation method of salt-soda soil biological modification agent according to claim 1, which is characterized in that table in the step (1)
Face activating agent is sorbitan fatty acid ester, any one in sucrose fatty ester.
3. the preparation method of salt-soda soil biological modification agent according to claim 1, which is characterized in that add in the step (1)
Adding agent is that sulphur, magnetic iron oxide 6~8:1 in mass ratio are uniformly mixed to get additive.
4. the preparation method of salt-soda soil biological modification agent according to claim 1, which is characterized in that pre- in the step (2)
Carbonization condition are as follows: at 100~130 DEG C, keep the temperature 1~3h, at 200~230 DEG C, keep the temperature 2~4h.
5. the preparation method of salt-soda soil biological modification agent according to claim 1, which is characterized in that mixed in the step (2)
Symphysis thing liquid the preparation method comprises the following steps: peat soil is adjusted water content to 70~80%, place 2~4 days naturally, after collecting placement
Peat soil, according to parts by weight, take 120~150 parts of water, 40~45 parts place after peat soil, 20~25 portions of beef extracts, 10~
15 portions of sucrose, 3~6 parts of sodium chloride, are stirred, at 25~35 DEG C place 30~35h, and using sulfuric acid solution adjust pH to
3.0~4.0, after placement, filtering collects filtrate to get mixed biologic liquid.
6. the preparation method of salt-soda soil biological modification agent according to claim 1, which is characterized in that battalion in the step (2)
Nutrient solution is according to the mass fraction, to take 160~180 parts of water, 30~35 parts of peptones, 18~23 parts of yeast extracts, 10~15 parts of Portugals
Grape sugar, is stirred, sterilizing is to get nutrient solution.
7. the preparation method of salt-soda soil biological modification agent according to claim 1, which is characterized in that increase in the step (4)
Add agent the preparation method comprises the following steps: according to the mass fraction, taking 140~170 parts of water, 20~25 parts of vermiculites, 10~15 parts of bacillus subtilis
Bacterium, 6~8 parts of glucose, 5~9 parts of polyglutamic acids, 1~3 part of sodium sulphate, 1~3 part of sodium chloride stir, freeze-drying, collect dry
Dry object is to get dose.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110698273A (en) * | 2019-11-25 | 2020-01-17 | 泉州市洛江奎芳保洁有限公司 | Preparation method of microbial fertilizer for soil improvement |
| CN113647407A (en) * | 2021-07-28 | 2021-11-16 | 南京农业大学 | Application of sodium sulfate in improving salt resistance of turfgrass |
| CN115093292A (en) * | 2022-08-24 | 2022-09-23 | 北京市农林科学院 | Saline-alkali soil modifier and application thereof |
-
2018
- 2018-08-29 CN CN201810996560.5A patent/CN109134141A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110698273A (en) * | 2019-11-25 | 2020-01-17 | 泉州市洛江奎芳保洁有限公司 | Preparation method of microbial fertilizer for soil improvement |
| CN113647407A (en) * | 2021-07-28 | 2021-11-16 | 南京农业大学 | Application of sodium sulfate in improving salt resistance of turfgrass |
| CN115093292A (en) * | 2022-08-24 | 2022-09-23 | 北京市农林科学院 | Saline-alkali soil modifier and application thereof |
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Application publication date: 20190104 |
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| WW01 | Invention patent application withdrawn after publication |