CN109821867A - A kind of mixed fertilizer for repairing mercury pollution and middle low mercury contaminated soil plant restorative procedure - Google Patents
A kind of mixed fertilizer for repairing mercury pollution and middle low mercury contaminated soil plant restorative procedure Download PDFInfo
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Abstract
The present invention relates to mercury contaminated soil plant restorative procedures low in one kind, belong to technical field of soil remediation, the restorative procedure containing mercury contaminated soil plant includes fertilising, work, harvesting, burns four processing steps, keep soil moisture content 35% or more first, then apply compound fertilizer, vegetables and ciliate desert-grass are subjected to intercropping plant, ciliate desert-grass is cradled 2~3 times every year, retain 8~20cm of aerial part when cradling, the ciliate desert-grass harvested is finally uniformly carried out to metallurgical furnace and burns harmless treatment.The present invention carries out intercropping plant using vegetables and ciliate desert-grass, can not only be enriched with to the mercury in soil, but also can plant mercury content vegetables up to standard, achieve the purpose that repair in production, have repairing effect obvious compared with conventional soil restorative procedure, without secondary pollution, the low advantage of rehabilitation cost.
Description
Technical field
The invention belongs to technical field of soil remediation, and in particular to a kind of mixed fertilizer that can repair mercury pollution and middle low mercury
Polluted soil phyto restorative procedure.
Background technique
Soil is the natural base of plant growth breeding, is the basic means of production of agricultural, is pole for the survival of mankind
Its important natural resources.With industry, the increase of the aggravation of municipal pollution and agrochemicals type, quantity, soil weight
Metallic pollution is got worse.Soil restoring technology is developed so far, the recovery technique being most widely used in engineering, and main includes solid
Change/stabilization technology, Soil leaching technology, electric repairing technique and electric heating recovery technique etc..Above-mentioned physical chemistry recovery technique,
Respectively there is its advantage, but it is big all to there is project amount, somewhat expensive, it is difficult to the improvement of massive pollution soil be unfolded, while being easy to make
At secondary pollution and soil texture is caused to destroy, the ecological problems such as soil activation decline and soil fertility degeneration.
The various reclamation activities of mercury pollution also become a hot spot of current research.Domestic and international more commonly used mercury is steady at present
Fixedization, which repairs medicament, basic agent, medicament of phosphate, clay mineral, sulfide and organic medicament etc., but with regard to present case
From the point of view of, basic agent and organic medicament, although repairing effect is preferable, in the case where external condition changes, available mercury contains
Amount can increase, although the mercury that medicament of phosphate can in a short time in effective fixing soil, soil physico-chemical property change
Change will lead to sediment and gradually dissolve.Although sulfide has the characteristics that remediation efficiency is high, gone back by soil pH and oxidation
The limitation of old terms.China is large agricultural country, if large area heavy metal mild or moderate polluted agricultural land is stopped farming, when carrying out long
Between plant or engineering reparation, this is unpractical under the status that China has a large population and a few land.Therefore phytoremediation technology will be needle
The method that centering minuent mercury contaminated soil reparation is worthy to be popularized.For phytoremediation technology, super enriching plant is found very
Key does not find the plant for having hyperaccumulation to mercury also at present.If enrichment planted using certain external control measures
Make between object and vegetables interaction, the features such as using enriching plant to activation, the preferential absorption of heavy metal, reduces a huge sum of money in intercrop vegetable
Belong to content, improves agricultural product security, will be an effective approach.
Summary of the invention
The object of the present invention is to provide mercury contaminated soil plant restorative procedures low in one kind, realize heavy metal mild or moderate mercury
The in-situ immobilization of contaminated soil and keep the content of heavy metal in industrial crops up to standard.
In order to achieve the above objectives, the invention provides the following technical scheme:
For promoting ciliate desert-grass mercury absorbability, and/or, crop root system is improved to the mixed fertilizer of mercury antagonistic ability, packet
It includes: organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer；The organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer are applied to while planting after can mixing
On the soil for having planted ciliate desert-grass and crops.
The mixed fertilizer includes the raw material of following parts by weight: 200~450 parts of organic fertilizers, 25~100 parts of N P and Ks are compound
Fertilizer, 3~30 parts of selenium fertilizer.
Organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer mixture promoted ciliate desert-grass mercury absorbability, and/or, improve farming
Object root system is to the application in terms of mercury antagonistic ability.
Low mercury contaminated soil restorative procedure in one kind, comprising: (1) that mixed fertilizer is suitable for low mercury pollution described is native
On earth；
(2) ciliate desert-grass and crops are spaced to plantation on the soil.
The plantation of the ciliate desert-grass refers to: the ciliate desert-grass seedling that length is 30~50cm being transplanted, planting density are as follows: strain
Away from 10~15cm, line-spacing: 25~35cm, depth is in 5~35cm；
Preferably, the vegetable transplanting is between ciliate desert-grass line-spacing, and the depth of plantation is in 10~30cm.
The middle low mercury contaminated soil restorative procedure, further includes: (3) gather in ciliate desert-grass；
Preferably, the aerial part 3-10cm of ciliate desert-grass is retained when harvesting.
The mixed fertilizer includes: organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer；
Preferably, the mixed fertilizer includes the raw material of following parts by weight: 200~450 parts of organic fertilizers, 25~100 parts of nitrogen phosphorus
K composite fertilizer, 3~30 parts of selenium fertilizer；
It is highly preferred that the nitrogen-phosphorus-potassium compound fertilizer, is N: K by weight2O∶P2O5=1: 0.67: 1；
It is highly preferred that the application concentration of the mixed fertilizer is 200~500Kg/ mus.
It is molten in the nursery stage leaf surface spraying concentration sodium thiosulfate for being 5% of the ciliate desert-grass and the mixing of potassium iodide
Liquid；
Preferably, the sodium thiosulfate and the mass ratio of potassium iodide are 1:1~1:3.
Periodically harvesting ciliate desert-grass, receiving ciliate desert-grass for the first time is growth 3~4 months, often grows to 40~50cm height receipts later
It cuts primary.
Annual spring, summer, autumn plant different vegetable respectively and complete a repairing efficiency.
Low mercury contaminated soil plant restorative procedure in one kind, it is characterised in that: low mercury pollution soil in described one kind
Earth plant restoration method includes fertilising, work, harvesting, burns four processing steps, specific as follows:
(1) it applies fertilizer: by soil conservation moisture content 35% or more, adding mixed fertilizer by 200~500Kg per acre, turn over depth
Degree is 15~25cm, is uniformly mixed, and natural conditions conserve 10~20 days.
(2) make between: the ciliate desert-grass seedling that length is 30~50cm being transplanted, planting density are as follows: 10~15cm of spacing in the rows,
Line-spacing: 25~35cm, depth is in 5~35cm, and vegetable transplanting is between ciliate desert-grass line-spacing, and the depth of plantation is in 10~30cm.
(3) gather in: ciliate desert-grass cradles 2~3 times every year, and 3~10cm of aerial part is retained when cradling.
(4) it burns: the ciliate desert-grass subregion harvested being classified in batches and carries out bailing, the unified metallurgical furnace that carries out burns nothing
Evilization processing.
The mixed fertilizer is conventional organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer.
The mixed fertilizer dosage is by 200~450 kilograms of application of organic fertilizers, 25~100 kilograms of nitrogen-phosphorus-potassium compound fertilizer, selenium per acre
3~30 kilograms of fertilizer.
The nitrogen-phosphorus-potassium compound fertilizer is N: K by weight2O∶P2O5=1: 0.67: 1.
The mixed solution of sodium thiosulfate and potassium iodide that ciliate desert-grass nursery stage leaf surface spraying concentration is 5%；Mass ratio
Example is 1:1~1:3.
Periodically harvesting ciliate desert-grass, receiving ciliate desert-grass for the first time is growth 3~4 months, often grows to 40~50cm height receipts later
It cuts primary.
Annual spring, summer, autumn plant different vegetable respectively and complete a repairing efficiency.
Low mercury contaminated soil plant restorative procedure in one kind, it is characterised in that: low mercury pollution soil in described one kind
Earth plant restoration method includes fertilising, work, harvesting, burns four processing steps, specific as follows:
(1) it applies fertilizer: by soil conservation moisture content 35% or more, adding mixed fertilizer by 200~500Kg per acre, turn over depth
Degree is 5~35cm, is uniformly mixed, and natural conditions conserve 15~20 days.
(2) make between: the ciliate desert-grass seedling that length is 30~50cm being transplanted, planting density are as follows: 10~15cm of spacing in the rows,
Line-spacing: 25~35cm, depth is in 5~35cm, and vegetable transplanting is between ciliate desert-grass line-spacing, and the depth of plantation is in 10~30cm.
(3) gather in: ciliate desert-grass cradles 2~3 times every year, and 3~10cm of aerial part is retained when cradling.
(4) it burns: the ciliate desert-grass subregion harvested being classified in batches and carries out bailing, the unified metallurgical furnace that carries out burns nothing
Evilization processing.
Further, the mixed fertilizer is conventional organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer.
Further, the mixed fertilizer dosage by 200~450 kilograms of application of organic fertilizers, nitrogen-phosphorus-potassium compound fertilizer 25 per acre~
100 kilograms, 3~30 kilograms of selenium fertilizer.
Further, the nitrogen-phosphorus-potassium compound fertilizer is N: K by weight2O∶P2O5=1: 0.67: 1.
Further, ciliate desert-grass nursery stage leaf surface spraying concentration is 5% in the step (3) sodium thiosulfate and iodine
Change the mixed solution of potassium；Mixed proportion is 1:1~1:3.
Further, ciliate desert-grass is periodically gathered in the step (3), receiving ciliate desert-grass for the first time is growth 3~4 months, after
It is primary often to grow to the harvesting of 40~50cm height.
Further, annual spring, summer, autumn plant different vegetable respectively and complete a reparation in step 1~4
Period.
Beneficial effects of the present invention: the present invention between ciliate desert-grass and vegetables using planting, with the stronger ability for being enriched with mercury；It is logical
Application mixed fertilizer is crossed, absorption of the ciliate desert-grass to mercury can have not only been strengthened, but also vegetable root system can be strengthened to the antagonistic effect of mercury, so that
Ciliate desert-grass and vegetables are more obvious to the competitive Adsorption of mercury, have reached centering minuent mercury contaminated soil high efficiency composition and have repaired purpose,
Have effect obvious compared with conventional soil restorative procedure and independent plant restoration method, remediation efficiency is high, and rehabilitation cost is low, without secondary
The advantages of pollution.
Specific embodiment
Below in conjunction with the embodiment of the present invention, only technical solution in the embodiment of the present invention is carried out, is completely retouched
It states, the protection scope without limiting the claims in the present invention.
1st group of embodiment, mixed fertilizer and its application of the invention
This group of embodiment provides one kind and is used to promote ciliate desert-grass mercury absorbability, and/or, it is short of money to mercury to improve crop root system
The mixed fertilizer of anti-ability, comprising: organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer；The organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer can mix
It is applied to while having planted after conjunction on the soil of ciliate desert-grass and crops.
In the particular embodiment, the mixed fertilizer includes the raw material of following parts by weight: 200~450 parts of organic fertilizers, 25~
100 parts of nitrogen-phosphorus-potassium compound fertilizers, 3~30 parts of selenium fertilizer.
Table 1
" ciliate desert-grass mercury absorbability " refers to after planting 90 days in mercury contaminated soil in ciliate desert-grass plant in upper table 1
Total mercury content, " crop root system is to mercury antagonistic ability " refers to after planting 90 days in mercury contaminated soil in crop root system
Total mercury content；The method of mercury content in said determination ciliate desert-grass plant and in crop root system is this field conventional determining
Method, for example, can be measured using " cold atomic absorbent spectrophotometry " or mercury content detector.
This group of embodiment is also provided with the mixture of machine fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer in promotion ciliate desert-grass mercury absorption energy
Power, and/or, crop root system is improved to the application in terms of mercury antagonistic ability.
2nd group of embodiment, soil remediation method of the invention
This group of embodiment provides low mercury contaminated soil restorative procedure in one kind, comprising: (1) is suitable for mixed fertilizer described
On middle minuent mercury contaminated soil；
" middle minuent mercury contaminated soil " herein refers to, mercury pollution concentration, that is, the concentration of the free state mercury in soil exists
The soil of 0.1mg/kg-1mg/kg.
(2) ciliate desert-grass and crops are spaced to plantation on the soil.
The crops are preferably industrial crops.The industrial crops are selected from: fibre crops (such as cotton, fiber crops), oil plant are made
Object (such as sesame, peanut), sugar crop (such as sugarcane, beet), three material (beverage, fragrance, condiment) crop, medicinal crop,
Dye crop, ornamental crops, fruit or vegetables.
In the particular embodiment, the plantation of the ciliate desert-grass refers to: the ciliate desert-grass seedling that length is 30~50cm is carried out
Transplanting, planting density are as follows: 10~15cm of spacing in the rows, line-spacing: 25~35cm, depth is in 5~35cm；Ciliate desert-grass modes of reproduction is mainly adopted
With sporogenesis and division propagation, transplanted again after breeding is good, such survival rate is high.Ciliate desert-grass is conducive to using above-mentioned planting density
It can grow, be independent of each other well with crops.
Preferably, the vegetable transplanting is between ciliate desert-grass line-spacing, and the depth of plantation is in 10~30cm.Root system of plant is above-mentioned
Depth can fully absorb nutrition.
The middle low mercury contaminated soil restorative procedure, further includes: (3) gather in ciliate desert-grass；Preferably, Wu is retained when harvesting
The aerial part 3-10cm of centipede grass, the advantage of doing so is that being conducive to that ciliate desert-grass is subsequent to continue to breed.
In the particular embodiment, the mixed fertilizer includes: organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer；
Preferably, the mixed fertilizer includes the raw material of following parts by weight: 200~450 parts of organic fertilizers, 25~100 parts of nitrogen phosphorus
K composite fertilizer, 3~30 parts of selenium fertilizer；
The effect of final mercury contaminated soil reparation is using the mixed fertilizer of said ratio: selenium energy antagonism mercury, cadmium, arsenic,
Murder by poisoning of the heavy metals such as lead, chromium to crop.Selenium delays the mechanism of antimercurialism are as follows: under the action of organic acid, selenium and mercury are in plant roots
The substance for being insoluble in water is formd in the soil of border, reduces the dissolubility of mercury, to reduce absorption of the plant to mercury.This technology side
It is base manure other than providing necessary nutrient to plant that case, which adds organic fertilizer, and another object is exactly organic fertilizer in soil media
The middle atmosphere for building organic acid, the stabilisation for the mercury on root system of plant surface provide necessary basis.
It is highly preferred that the nitrogen-phosphorus-potassium compound fertilizer, is N: K by weight2O∶P2O5=1: 0.67: 1；By said ratio,
Plant is by Preferential adsorption fertilizer element.
It is highly preferred that the application concentration of the mixed fertilizer is 200~500Kg/ mus.
It in a further embodiment, is mass concentration 5% in the nursery stage leaf surface spraying concentration of the ciliate desert-grass
The mixed solution of sodium thiosulfate and potassium iodide；5% mass concentration refers specifically to: sodium thiosulfate and both substances of potassium iodide
The mass concentration of solute in mixed solution is suitble to the abundant dissolution of above two substance using this concentration.
Preferably, the sodium thiosulfate and the mass ratio of potassium iodide are 1:1~1:3；Can be had using this ratio
Effect prevents absorption of the ciliate desert-grass in the seedling age phase to mercury.
In a more specific embodiment, ciliate desert-grass is periodically gathered in, effect is the mercury for periodically removing ciliate desert-grass absorption；It receives for the first time
Ciliate desert-grass is growth 3~4 months, can get maximum biomass in this way；It is primary that the harvesting of 40~50cm height is often grown to later,
The purpose done so is: ciliate desert-grass grows in spring and summer and reproduction speed is most fast, other seasonal growths to 40-50cm
Reach maximum biomass state.
In some embodiments, annual spring, summer, autumn plant different vegetable respectively and complete a repairing efficiency；?
Be respectively necessary in three seasons planting different vegetables, due to being that outdoor is handled, can according to climate change, planting season property vegetables,
To meet production requirement.
Experimental example 1
One piece of 100m is chosen near the mining area of Tongren Prefecture, Guizhou2Farmland is as experimental plot, and specific repair process is such as
Under:
(1) by soil conservation moisture content 45%, organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer are added by 350Kg per acre,
100 kilograms of middle Rate of Organic Fertilizer, 45 kilograms of nitrogen-phosphorus-potassium compound fertilizer, 5 kilograms of selenium fertilizer.Ploughed depth is 20cm, is uniformly mixed, natural
Condition conserves 15 days；
(2) the ciliate desert-grass seedling that length is 30cm is transplanted, planting density are as follows: spacing in the rows 12cm, line-spacing: 30cm is deep
Degree is in 10cm, the mixed solution of sodium thiosulfate and potassium iodide that ciliate desert-grass nursery stage leaf surface spraying concentration is 5%；Quality is mixed
Composition and division in a proportion example is 1:1.Vegetable transplanting is between ciliate desert-grass line-spacing, and the depth of plantation is in 10cm.
(3) gather in: ciliate desert-grass cradles 3 times every year, and aerial part 3cm is retained when cradling.
(4) it burns: the ciliate desert-grass subregion harvested being classified in batches and carries out bailing, the unified metallurgical furnace that carries out burns nothing
Evilization processing.Burning this step is that the subsequent processing mode of Soil Mercury Pollution is absorbed to ciliate desert-grass.
Annual spring plants crowndaisy chrysanthemum in above-described embodiment, and summer plants water spinach, and autumn plants Chinese cabbage and completes a reparation
Period.
Experimental analysis
Table 1 is the variation of soil mercury content in repairing efficiency, and table 2 is crowndaisy chrysanthemum, water spinach, heavy metal in Chinese cabbage body
Content measuring result.From the results, it was seen that in a repairing efficiency, soil mercury content reduction by 32.65%, planting vegetable
Upper part can reach the standard of " national food safety standard pollutants in food limit standard " (GB2762-2012).
1 embodiment 1 of table repairs front and back Mercury in Soil changes of contents (unit: mg/kg)
| The form of mercury | Weak acid extractable | It can reduction-state | Oxidable state | Residual form | Total mercury content |
| Before reparation | 0.022 | 0.015 | 0.532 | 9.256 | 9.852 |
| After reparation | 0.007 | 0.012 | 0.358 | 6.258 | 6.635 |
Table 2 is heavy metal Hg content measuring result (unit: mg/kg) in virgin wormwood artemisia, water spinach, Chinese cabbage body
Experimental example 2
One piece of 80m is chosen near Shaanxi Province Ankang City mining area2As experimental plot, specific repair process is as above in farmland:
(3) by soil conservation moisture content 50%, organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer are added by 500Kg per acre,
200 kilograms of middle Rate of Organic Fertilizer, 60 kilograms of nitrogen-phosphorus-potassium compound fertilizer, 10 kilograms of selenium fertilizer.Ploughed depth is 25cm, is uniformly mixed, from
Right condition conserves 15 days；
(4) the ciliate desert-grass seedling that length is 25cm is transplanted, planting density are as follows: spacing in the rows 15cm, line-spacing: 35cm is deep
Degree is in 12cm, the mixed solution of sodium thiosulfate and potassium iodide that ciliate desert-grass nursery stage leaf surface spraying concentration is 5%；Mass ratio
Example is 1:2.Vegetable transplanting is between ciliate desert-grass line-spacing, and the depth of plantation is in 10cm.
(3) gather in: ciliate desert-grass cradles 3 times every year, and aerial part 8cm is retained when cradling.
(4) it burns: the ciliate desert-grass subregion harvested being classified in batches and carries out bailing, the unified metallurgical furnace that carries out burns nothing
Evilization processing.
Annual spring plants spinach in above-described embodiment, and summer plants water spinach, and autumn plants Chinese cabbage and completes a reparation
Period.
Experimental analysis
Table 3 is the variation of soil mercury content in repairing efficiency, and table 4 is spinach, water spinach, heavy metal in Chinese cabbage body
Content measuring result.From the results, it was seen that in a repairing efficiency, soil mercury content reduction by 36.61%, planting vegetable
Upper part can reach the standard of " national food safety standard pollutants in food limit standard " (GB2762-2012).
3 embodiment 2 of table repairs front and back Mercury in Soil changes of contents (unit: mg/kg)
Table 4 is heavy metal Hg content measuring result (unit: mg/kg) in virgin wormwood artemisia, water spinach, Chinese cabbage body
Experimental example 3, the present invention are merely using the compliance test result for the restorative procedure planted between ciliate desert-grass and crops
In addition to not adding mixed fertilizer, remaining is identical as experimental example 1, and by experimental analysis, table 5 is in a repairing efficiency,
The variation of soil mercury content, table 6 are crowndaisy chrysanthemum, water spinach, Chinese cabbage in-vivo heavy metal content test result.
5 embodiment 1 of table repairs front and back Mercury in Soil changes of contents (unit: mg/kg)
| The form of mercury | Weak acid extractable | It can reduction-state | Oxidable state | Residual form | Total mercury content |
| Before reparation | 0.022 | 0.015 | 0.532 | 9.256 | 9.852 |
| After reparation | 0.012 | 0.013 | 0.379 | 6.523 | 6.927 |
Table 6 is heavy metal Hg content measuring result (unit: mg/kg) in virgin wormwood artemisia, water spinach, Chinese cabbage body
Even if by 5~table of table 6 as can be seen that do not add mixed fertilizer, using plant restoration method of the invention, by having
Ciliate desert-grass and crops miscegenation can be also effectively reduced soil by method characteristic documented by above-mentioned 2nd group of any one of embodiment
Mercury content and the intracorporal mercury content of crops.
Experimental example 4, the method for the present invention and existing method repairing effect compare
The method of the present invention is respectively adopted in same test site and existing method carries out the phytoremediation of mercury contaminated soil, examination
The concrete operations for testing place and the method for the present invention are identical as experimental example 2, and the concrete operations of existing method can be found in patent of invention Shen
It please 201810596640.1 methods disclosed.
7 the method for the present invention of table and existing method are repaired front and back Mercury in Soil changes of contents and are compared
8. the method for the present invention of table and existing method are repaired mercury content variation in the vegetables body of front and back and are compared
By 7~table of table 8 as can be seen that in comparative example 1, the mercury of soil various forms is compared compared with embodiment 1 raising,
On various vegetable fields and aerial part mercury content is also increased compared with embodiment 1, and 1 mercury reduced rate of comparative example is 29.69%, real
Applying 1 mercury reduced rate of example is 32.65%.The above result shows that enhancing the adsorption energy to mercury of ciliate desert-grass after addition mixed fertilizer
The absorption to mercury of power, vegetables weakens, and the addition of mixed fertilizer is so that ciliate desert-grass and vegetables are more obvious to the competition absorption of mercury.
The method of ciliate desert-grass and herba setariae viridis miscegenation to reduce Soil Mercury Pollution, the purpose of the present invention are used compared to existing method
Soil Mercury Pollution can be reduced and not delay soil crop production, it can be achieved that the purpose for becoming production is repaired on side by essentially consisting in, and
The effect that mercury content reduces in repairing effect especially crops body outclass existing method.
Claims (10)
1. for promoting ciliate desert-grass mercury absorbability, and/or, crop root system is improved to the mixed fertilizer of mercury antagonistic ability, comprising:
Organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer；The organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer are applied to while planting after can mixing
On the soil of ciliate desert-grass and crops.
2. mixed fertilizer according to claim 1, the raw material including following parts by weight: 200~450 parts of organic fertilizers, 25~100
Part nitrogen-phosphorus-potassium compound fertilizer, 3~30 parts of selenium fertilizer.
3. the mixture of organic fertilizer, nitrogen-phosphorus-potassium compound fertilizer, selenium fertilizer is promoting ciliate desert-grass mercury absorbability, and/or, improve crops
Root system is to the application in terms of mercury antagonistic ability.
4. low mercury contaminated soil restorative procedure in one kind, comprising: (1) mixed fertilizer is suitable for minuent mercury contaminated soil described
On；
(2) ciliate desert-grass and crops are spaced to plantation on the soil.
5. middle low mercury contaminated soil restorative procedure according to claim 4, wherein the plantation of the ciliate desert-grass refers to: will
Length is that the ciliate desert-grass seedling of 30~50cm is transplanted, planting density are as follows: 10~15cm of spacing in the rows, line-spacing: 25~35cm, depth
In 5~35cm；
Preferably, the vegetable transplanting is between ciliate desert-grass line-spacing, and the depth of plantation is in 10~30cm.
6. middle low mercury contaminated soil restorative procedure according to claim 4 or 5, further includes: (3) gather in ciliate desert-grass；
Preferably, the aerial part 3-10cm of ciliate desert-grass is retained when harvesting.
7. middle low mercury contaminated soil restorative procedure according to claim 4, the mixed fertilizer includes: organic fertilizer, nitrogen phosphorus
K composite fertilizer, selenium fertilizer；
Preferably, the mixed fertilizer includes the raw material of following parts by weight: 200~450 parts of organic fertilizers, 25~100 parts of azophoskas
Hefei, 3~30 parts of selenium fertilizer；
It is highly preferred that the nitrogen-phosphorus-potassium compound fertilizer, is N: K by weight2O∶P2O5=1: 0.67: 1；
It is highly preferred that the application concentration of the mixed fertilizer is 200~500Kg/ mus.
8. the middle minuent mercury contaminated soil restorative procedure according to claim 4 or 7, wherein in the nursery of the ciliate desert-grass
The mixed solution of sodium thiosulfate and potassium iodide that stage leaf surface spraying concentration is 5%；
Preferably, the sodium thiosulfate and the mass ratio of potassium iodide are 1:1~1:3.
9. according to any middle low mercury contaminated soil restorative procedure of claim 4-6, wherein ciliate desert-grass is periodically gathered in,
Receiving ciliate desert-grass for the first time is growth 3~4 months, and it is primary often to grow to the harvesting of 40~50cm height later.
10. according to any middle low mercury contaminated soil restorative procedure of claim 4-9, wherein annual spring, summer,
Autumn plants different vegetable respectively and completes a repairing efficiency.
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| CN113141984A (en) * | 2021-03-03 | 2021-07-23 | 南京大学 | Method for realizing soil remediation and safe production of swamp cabbage by combining ciliate desert-grass and foliage calcium spraying |
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