CN109892180A - The method of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair - Google Patents
The method of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair Download PDFInfo
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Abstract
The present invention provides a kind of methods of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair, are related to soil remediation field.The method of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair, comprising the following steps: plant Phytolacca acinosa in cadmium pollution soil, gather in the overground part of the Phytolacca acinosa after cultivation；The rice cultivation in gathering in the soil after the Phytolacca acinosa, gathers in the aerial part of the rice after cultivation；The aerial part of the overground part of the Phytolacca acinosa and the rice is done into harmless treatment.The method of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair provided by the present application, efficiency is removed with higher Cadmium in Soil, the ecological environment of soil and the fractions distribution of cadmium can be changed, promoting soil different shape includes the conversion between available state, the repairing effect to cadmium pollution soil is improved, realizes effective reparation to cadmium pollution soil；Have many advantages, such as that repairing effect is good, administrative skill requires physicochemical property that is low, easy to operate, can improveing soil, there is good environmental benefit, social benefit.
Description
Technical field
The present invention relates to soil remediation fields, in particular to a kind of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair
Method.
Background technique
Currently, the method for administering restoring cadmium polluted arable soil mainly has physical method, chemical method, such as soil moved in improve the original, leaching
It washes, soil deactivation method etc.；Bioanalysis, such as microorganism are stable, animal activating；Agronomic measures, such as water and fertilizer management, plough deeply it is cultivated.
These methods respectively have it a little, but are usually present that project amount is big, costly, long-term stability is poor, be easy to cause secondary dirt
It contaminates, cause soil texture to destroy while also destroying the original biotic environment of soil, be unfavorable for the later use of agricultural land soil.
In view of this, the present invention is specifically proposed.
Summary of the invention
The purpose of the present invention is to provide a kind of method of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair, the methods
Design reasonable, low-cost, strong operability, can efficient cadmium pollution soil repair, have good environmental benefit and society effect
Benefit has boundless application prospect.
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
A kind of method of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair, comprising the following steps:
Phytolacca acinosa is planted in cadmium pollution soil, gathers in the overground part of the Phytolacca acinosa after cultivation；
The rice cultivation in gathering in the soil after the Phytolacca acinosa, gathers in the aerial part of the rice after cultivation；
The aerial part of the overground part of the Phytolacca acinosa and the rice is done into harmless treatment.
Single cadmium pollution rehabilitation plant has that treatment effeciency is low, Phytolacca acinosa and rice is carried out crop rotation, favorably
In changing form and distribution of the heavy metal cadmium in soil, a large amount of uptake and accumulation cadmiums, it is mitogenetic to gather in its overground part from soil
Object amount can take away a large amount of cadmium from soil.Cadmium Pollution in Soils repairing and treating is carried out using Cd-hyperaccumulator with traditional
Phytoremediation technology ratio, Phytolacca acinosa and rice are in addition to the ability with a large amount of cadmiums of uptake and accumulation, and there are also other Cd-hyperaccumulators not
The characteristics of big biomass that can be matched in excellence or beauty, overground part can accumulate more cadmium contents, therefore there is higher Cadmium in Soil to remove effect
Rate.In addition, Phytolacca acinosa and rice crop rotation, change the ecological environment of soil, change the fractions distribution of Cadmium in Soil, promotes soil different
Form includes the conversion between available state, and then preferably improves the repairing effect to cadmium pollution soil, is realized to cadmium pollution soil
Effective reparation.
It should be noted that the overground part of Phytolacca acinosa and the aerial part of rice, what is referred to is all that they are exposed at outside soil
Part.
Preferably, the time for planting the Phytolacca acinosa is spring, preferably 3-4 month.
It is further preferred that the time for gathering in the overground part of the Phytolacca acinosa is 6-7 month.
It is further preferred that the height of the overground part of the Phytolacca acinosa of harvesting is 1-2m.
Plantation and the arrangement of harvesting time for Phytolacca acinosa, primarily to the plantation with rice is matched.And for
When gathering in Phytolacca acinosa, the control of overground part height is the biomass in order to control aerial part, guarantees that whole Cadmium in Soil removes
Efficiency.
It is further preferred that the process for planting the Phytolacca acinosa includes: by the seedling of the Phytolacca acinosa with 0.8-1.2 meters of line-spacing, strain
It is planted in the cadmium pollution soil away from 0.5 meter of ridging by compartment.
The setting of Phytolacca acinosa transplanting, planting patterns and line-spacing, spacing in the rows, is the efficient growth in order to guarantee Phytolacca acinosa, is more advantageous to
Improve form and distribution of the heavy metal cadmium in soil, improves Cadmium in Soil and remove efficiency.
Preferably, the process for cultivating the Phytolacca acinosa includes: with natural growth pattern culture, and the first compound fertilizer of application；It is excellent
Selection of land, the applied amount of first compound fertilizer are 40-80kg/ mus, N, P in first compound fertilizer2O5、K2The weight ratio of O
It is 20: 8: 12.
The requirement of planting patterns and compound fertilizer's applied amount, principal component content is to guarantee Phytolacca acinosa biomass.First is multiple
N, P in Hefei2O5、K2The optimum weight ratio of O is 15-20: 8-10: 12.
Preferably, the rice is cadmium high-selenium corn late rice.
It is further preferred that the cadmium high-selenium corn late rice includes in cadmium high-selenium corn conventional Rice and cadmium high-selenium corn hybrid paddy rice
At least one, preferably kind are Yu Zhenxiang.
It is to improve Cd uptake amount for the preferred of rice varieties.For example, Hunan evening Xian 12, T it is excellent 272, it is deep excellent 9586,
Grand perfume is excellent 130, the excellent China in day accounts for, two excellent 336, beautiful precious perfume (or spice) etc..
Preferably, the process for cultivating the rice includes: and to apply urea with natural growth pattern culture；Preferably,
The applied amount of the urea is 5-10kg/ mus.
It is further preferred that cultivating the process of the rice further include: apply the second compound fertilizer；Preferably, described second is multiple
The applied amount in Hefei is 40-60kg/ mus, N, P in second compound fertilizer2O5、 K2The weight ratio of O is 10-15: 10-15:
15。
To paddy growth mode, apply fertilizer type and dosage, the principal component content ratio of compound fertilizer, also for
Guarantee the biomass of rice, to guarantee the amount of Cd uptake and remove efficiency.N, P in second compound fertilizer2O5、K2O's is best
Weight ratio is 15: 15: 15.
Compared with prior art, the invention has the benefit that
(1) good, administrative skill requires low, operation with repairing effect for Phytolacca acinosa and cadmium high-selenium corn kind rice crop rotation technology
Conveniently, the advantages that physicochemical property of soil can be improved；
(2) compared with individual Cd uptake plant soil restoration method, Phytolacca acinosa and rice crop rotation have the effect of gain,
It greatly improves Cd uptake amount and removes efficiency；
(3) there are good environmental benefit, social benefit.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described.
The cadmium removal quantity comparative diagram that Fig. 1 is the embodiment of the present application 1-5, comparative example 1-5 and 6-10 are obtained.
Wherein, processing A be comparative example 1-5's as a result, processing B be comparative example 6-10's as a result, processing C be embodiment 1-5
Result.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
It will be appreciated that the following example is merely to illustrate the present invention, and it is not construed as limiting the scope of the invention.It is not specified in embodiment
Actual conditions person carries out according to conventional conditions or manufacturer's recommended conditions.Production firm is not specified in agents useful for same or instrument
Person is the conventional products that can be obtained by commercially available purchase.
Plant crop rotation refers on same field there is the different crop of shifting cultivation sequentially between season or between year
Or a kind of planting patterns of multiple cropping combination, it is a kind of biology measure combined the use of land with the nurturing of land.The life of soil can be changed in crop rotation
State environment increases the noncapilarry porosity of paddy field soil, improves oxidation-reduction potential, advantageous soil aeration and organic matter decomposition, disappears
Except the noxious material in soil, Soil Secondary gleying process is prevented, and can promote the breeding of soil beneficial microorganism.Plant
Recovery technique be it is a kind of with it is economical, green, environmental-friendly and can the advantages such as in-situ immobilization the reparation based on plant
Heavy metal in soil is transferred in plant by technology using plant, realizes the reparation to heavy-metal contaminated soil.For
For cadmium pollution arable soil, root system of plant is primarily limited to the existing forms of cadmium in the soil to Cd uptake effect, as can by
The content of the exchangeable cadmium of plant absorption accumulation is relatively fewer, causes root system of plant that can not effectively absorb more cadmium ions,
So that plant is difficult to improve the repairing effect of cadmium pollution soil.Plant Rotation System based on phytoremediation is applied to cadmium
The reparation of polluted farmland soil is an effective new way, makes full use of the physiological property of different plants to improve pollution
The repair rate of soil, and Cd-polluted farmland soil remediation effect can be effectively improved.
Phytolacca acinosa involved in the embodiment of the present invention is a kind of Cd-hyperaccumulator, is focused mostly in cauline leaf to the storage of Cd,
Overground part cadmium mass fraction is far longer than underground part.Phytolacca acinosa is herbaceos perennial, is widely distributed in Red soil low-hilly land mound on the south the Changjiang river
Area, likes the weather conditions of warm and moist, suitable growth temperature be between 14~30 DEG C, after autumn, the ground of Phytolacca acinosa
Part can wither after fallen leaves, and the fleshy root of underground is resistant to -15 DEG C of low temperature, and fleshy root germination expedites the emergence of on the ground when the coming year is warm
Some growth, to the extremely well-adapted of soil.Compare general super enriching plant, Phytolacca acinosa Phytolacca acinosa has accumulation ability strong, raw
Object amount is big, and the high advantage of removal total amount, is a kind of good rehabilitation plant.
The present invention has chosen that Hunan evening Xian 12, T are excellent 272, deep excellent 9586, grand perfume is excellent 130, the excellent China in day accounts for, two excellent 336, Yu Zhen
The rice that fragrant 7 Varieties In Late Rices are used as embodiment.
Firstly, investigated under the same conditions using above-mentioned experimental plot Varieties In Late Rice used respectively individually to the absorption of cadmium and
Cumulant.
The experimental plot for choosing the good Cheng Cun in liuyang hunan Yonghe County town carries out planting experiment, physicochemical property are as follows: soil pH 6.0,
The full Cd content of soil is 1.9mgkg-1, soil organism 38.6gkg-1, full phosphorus 0.7gkg-1, full potassium 12.6gkg-1,
Available phosphorus 13.7mgkg-1, available potassium 88.5mgkg-1, alkali-hydrolyzable nitrogen 218.3mgkg-1。
Specifically, having investigated each late rice paddy, straw cadmium content, dry weight and cadmium accumulate total amount.As a result referring to subordinate list 1:
Cd content and its cumulant in 1 different cultivars rice of table and straw
The above result shows that beautiful precious fragrant cadmium with higher accumulates total amount, cadmium content point in 7 late rice paddy and straw
Not Wei 1.1-5.2mg/kg and 4.9-32.8mg/kg, the Cd total accumulation of paddy and straw is 3.0-23.9g/ mu, wherein jade
Cadmium content is significantly higher than cadmium content in other 6 late rice paddy and straw in precious perfume paddy and straw, and cadmium accumulation total amount is
23.9g/ mus.
The a piece of experimental plot for choosing the good Cheng Cun in liuyang hunan Yonghe County town carries out planting experiment, and soil is granite development
Numb sand mud, analysis of physical and chemical property: soil pH 5.4, the full Cd content of soil are 1.6mg kg-1, soil organism 39.0gkg-1, full phosphorus 0.7gkg-1, full potassium 14.0gkg-1, available phosphorus 13.5mgkg-1, available potassium 160.9mgkg-1, alkali-hydrolyzable nitrogen
212.8mg·kg-1, pollution cause upstream Qibaoshan Iron ore extraction causes the cadmium pollution of downstream farmland.
Experimental plot is divided into 15 cells, is separated between each cell with ridge, plot area is 10 × 5=50m2。
It is 15 small to divide into 3 groups, embodiment 1-5 (processing C) and comparative example 1-5 (processing A), comparative example 6-10 (processing are carried out respectively
B).Wherein, the Phytolacca acinosa seed that the Phytolacca acinosa seed and comparative example 1-5 that embodiment 1-5 is used use is the unified nursery with a batch；It is real
It applies the Yu Zhenxiang that a 1-5 is used and the Yu Zhenxiang seed that comparative example 6-10 is used is the unified seedling with a batch.
Embodiment 1
It chooses Phytolacca acinosa seed to transplant mid-April in broken shell nursery mid-March into above-mentioned experimental plot, ridging presses compartment kind
It plants, setting line-spacing is 1 meter, and spacing in the rows is 0.5 meter.Late June gathers in the overground part of Phytolacca acinosa, the height control of overground part
Within the scope of 1-2m.The weight of Phytolacca acinosa overground part and the content of cadmium are measured after harvesting.
Then early July carries out the rice transplanting of beautiful precious perfume rice, the harvesting of the last ten-days period in September in the experimental plot that harvesting finishes Phytolacca acinosa
The aerial part of rice.The weight and the wherein content of cadmium of rice straw and paddy are measured after harvesting respectively.
By the aerial part of the overground part of the Phytolacca acinosa of harvesting and rice, harmless treatment is done respectively.
Embodiment 2
It chooses Phytolacca acinosa seed to transplant mid-April in broken shell nursery mid-March into above-mentioned experimental plot, ridging presses compartment kind
It plants, setting line-spacing is 0.8 meter, and spacing in the rows is 0.8 meter.With the plantation of natural growth pattern, apply the first compound fertilizer in planting process,
Applied amount is 40kg/ mus, N, P in the first compound fertilizer2O5、 K2The weight ratio of O is 20: 8: 12.Ground of the late June to Phytolacca acinosa
Portion is gathered in, and the height of overground part controls within the scope of 1-2m.The weight of Phytolacca acinosa overground part and containing for cadmium are measured after harvesting
Amount.
Then early July carries out the rice transplanting of beautiful precious perfume rice in the experimental plot that harvesting finishes Phytolacca acinosa, and rice is with natural life
Long mode is planted, and when plantation applies urea, and applied amount is 5kg/ mus；Also apply compound fertilizer and carries out top dressing, applied amount 40kg/
Mu, N, P in the second compound fertilizer2O5、K2The weight ratio of O is 15: 15: 15.Late September gathers in the aerial part of rice, harvesting
Measure the weight and the wherein content of cadmium of rice straw and paddy respectively afterwards.
By the aerial part of the overground part of the Phytolacca acinosa of harvesting and rice, harmless treatment is done respectively.
Embodiment 3
It chooses Phytolacca acinosa seed to transplant mid-April in broken shell nursery mid-March into above-mentioned experimental plot, ridging presses compartment kind
It plants, setting line-spacing is 1.2 meters, and spacing in the rows is 0.7 meter.With the plantation of natural growth pattern, apply the first compound fertilizer in planting process,
Applied amount is 50kg/ mus, N, P in the first compound fertilizer2O5、 K2The weight ratio of O is 15: 10: 12.Ground of the late June to Phytolacca acinosa
Top is gathered in, and the height of overground part controls within the scope of 1-2m.The weight of Phytolacca acinosa overground part and containing for cadmium are measured after harvesting
Amount.
Then early July carries out the rice transplanting of beautiful precious perfume rice in the experimental plot that harvesting finishes Phytolacca acinosa, and rice is with natural life
Long mode is planted, and when plantation applies urea, and applied amount is 7kg/ mus；Also apply compound fertilizer and carries out top dressing, applied amount 45kg/
Mu, N, P in the second compound fertilizer2O5、K2The weight ratio of O is 10: 12: 15.Late September gathers in the aerial part of rice, harvesting
Measure the weight and the wherein content of cadmium of rice straw and paddy respectively afterwards.
By the aerial part of the overground part of the Phytolacca acinosa of harvesting and rice, harmless treatment is done respectively.
Embodiment 4
It chooses Phytolacca acinosa seed to transplant mid-April in broken shell nursery mid-March into above-mentioned experimental plot, ridging presses compartment kind
It plants, setting line-spacing is 1 meter, and spacing in the rows is 0.5 meter.With the plantation of natural growth pattern, applies the first compound fertilizer in planting process, apply
Dosage is 60kg/ mus, N, P in the first compound fertilizer2O5、 K2The weight ratio of O is 18: 9: 12.Overground part of the late June to Phytolacca acinosa
It is gathered in, the height of overground part controls within the scope of 1-2m.The weight of Phytolacca acinosa overground part and the content of cadmium are measured after harvesting.
Then early July carries out the rice transplanting of beautiful precious perfume rice in the experimental plot that harvesting finishes Phytolacca acinosa, and rice is with natural life
Long mode is planted, and when plantation applies urea, and applied amount is 8kg/ mus；Also apply compound fertilizer and carries out top dressing, applied amount 50kg/
Mu, N, P in the second compound fertilizer2O5、K2The weight ratio of O is 12: 10: 15.Late September gathers in the aerial part of rice, harvesting
Measure the weight and the wherein content of cadmium of rice straw and paddy respectively afterwards.
By the aerial part of the overground part of the Phytolacca acinosa of harvesting and rice, harmless treatment is done respectively.
Embodiment 5
It chooses Phytolacca acinosa seed to transplant mid-April in broken shell nursery mid-March into above-mentioned experimental plot, ridging presses compartment kind
It plants, setting line-spacing is 1 meter, and spacing in the rows is 0.5 meter.With the plantation of natural growth pattern, applies the first compound fertilizer in planting process, apply
Dosage is 80kg/ mus, N, P in the first compound fertilizer2O5、 K2The weight ratio of O is 20: 8: 12.Overground part of the late June to Phytolacca acinosa
It is gathered in, the height of overground part controls within the scope of 1-2m.The weight of Phytolacca acinosa overground part and the content of cadmium are measured after harvesting.
Then early July carries out the rice transplanting of beautiful precious perfume rice in the experimental plot that harvesting finishes Phytolacca acinosa, and rice is with natural life
Long mode is planted, and when plantation applies urea, and applied amount is 10kg/ mus；Also apply compound fertilizer and carries out top dressing, applied amount 60kg/
Mu, N, P in the second compound fertilizer2O5、K2The weight ratio of O is 15: 15: 15.Late September gathers in the aerial part of rice, harvesting
Measure the weight and the wherein content of cadmium of rice straw and paddy respectively afterwards.
By the aerial part of the overground part of the Phytolacca acinosa of harvesting and rice, harmless treatment is done respectively.
Comparative example 1-5
The Phytolacca acinosa seedling that embodiment 1-5 is used is chosen, transplants in same time into the respective block in above-mentioned experimental plot and carries out
Check experiment.
The weight of Phytolacca acinosa overground part and the content of cadmium are measured after harvesting respectively.Gather in not re-planting paddy after Phytolacca acinosa.
Comparative example 6-10
The rice seedling that embodiment 1-5 is used is chosen, in the same time of embodiment 1-5, in the corresponding of above-mentioned experimental plot
Rice transplanting is carried out in block, carries out check experiment.
The weight and the wherein content of cadmium of rice straw and paddy are measured after harvesting respectively.
Measurement result is as shown in Figure 1.
The average cadmium accumulation removal quantity for handling Phytolacca acinosa in A is 6.8g/ mus, and the removal rate 2.9% of soil total Cd handles B
The average cadmium accumulation removal quantity of middle Yu Zhenxiang is 17.5g/ mus, and the removal rate 7.3% of soil total Cd handles Phytolacca acinosa and water in C
Average total cadmium accumulation removal quantity of cadmium is 31.2g/ mus in the top of rice field, the removal rate 13.0% of soil total Cd, wherein Phytolacca acinosa
Average cadmium accumulation removal quantity be 6.5g/ mu, the average cadmium of rice accumulation removal quantity is 24.7g/ mus.
In order to illustrate Phytolacca acinosa and influence of the rice crop rotation for cadmium bio-available Zn concentration in soil, embodiment 1- is measured respectively
5, cadmium bio-available Zn concentration in experimental plot soil used in comparative example 1-5, comparative example 6-10, result are as shown in table 2 below:
Cd bio-available Zn concentration in 2 soil of table
| Project | Phytolacca acinosa season mg/kg | Late rice season mg/kg |
| Embodiment 1-5 | 0.41±0.03c | 0.56±0.03a |
| Comparative example 1-5 | 0.43±0.04c | / |
| Comparative example 6-10 | / | 0.50±0.04b |
Note: significant difference (p < 0.05) is horizontal between different lowercases indicate different disposal.
Test and table 2 the result shows that, Phytolacca acinosa and rice crop rotation can significantly improve soil Cd bio-available Zn concentration, Phytolacca acinosa and water
Rice crop rotation combines the breeding cycle of the two, effectively improves land utilization ratio, so that the biomass of two kinds of crops is reached maximum, also makes
The cadmium accumulation total content of two kinds of crop overground parts reaches maximum value, effectively improves the plants enriched efficiency for removing cadmium, has fine
Environmental benefit and social benefit.
Method of the application by utilizing Phytolacca acinosa and rice crop rotation cadmium pollution soil repair, mainly utilizes Phytolacca acinosa and cadmium
High-selenium corn kind rice a large amount of uptake and accumulation cadmiums from agricultural land soil, gather in its Aboveground Biomass of Young, can take away from soil
A large amount of cadmium.Method provided by the present application is especially suitable for middle heavy Cd contamination soil, for example, cadmium in cadmium pollution soil
Concentration is greater than 0.6mg/kg.With traditional phytoremediation skill for carrying out Cadmium Pollution in Soils repairing and treating using Cd-hyperaccumulator
Art ratio, Phytolacca acinosa and cadmium high-selenium corn kind rice are in addition to the ability with a large amount of cadmiums of uptake and accumulation, and there are also other Cd-hyperaccumulators
The characteristics of big biomass that cannot be matched in excellence or beauty, overground part can accumulate more cadmium contents, therefore there is higher Cadmium in Soil to remove effect
Rate.In addition, Phytolacca acinosa and cadmium high-selenium corn kind rice crop rotation, change the ecological environment of soil, change the fractions distribution of Cadmium in Soil,
Promoting soil different shape includes the conversion between available state, and then preferably improves the repairing effect to cadmium pollution soil, is realized
Effective reparation to cadmium pollution soil.Phytolacca acinosa and cadmium high-selenium corn kind rice crop rotation technology have that repairing effect is good, administrative skill
It is required that, there are good environmental benefit, social benefit in the advantages that physicochemical property that is low, easy to operate, can improveing soil.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from of the invention
Many other change and modification can be made in the case where spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. a kind of method of Phytolacca acinosa and rice crop rotation cadmium pollution soil repair, which comprises the following steps:
Phytolacca acinosa is planted in cadmium pollution soil, gathers in the overground part of the Phytolacca acinosa after cultivation；
The rice cultivation in gathering in the soil after the Phytolacca acinosa, gathers in the aerial part of the rice after cultivation；
The aerial part of the overground part of the Phytolacca acinosa and the rice is done into harmless treatment.
2. the method according to claim 1, wherein the time for planting the Phytolacca acinosa is spring, preferably the 3-4 month
Part.
3. according to the method described in claim 2, it is characterized in that, the time for gathering in the overground part of the Phytolacca acinosa is 6-7 month.
4. according to the method described in claim 3, it is characterized in that, the height of the overground part of the Phytolacca acinosa of harvesting is 1-2m.
5. method according to claim 1-4, which is characterized in that the process for planting the Phytolacca acinosa includes: by institute
The seedling of Phytolacca acinosa is stated to plant in the cadmium pollution soil with 0.5-0.8 meters of 0.8-1.2 meters of line-spacing, spacing in the rows ridgings by compartment.
6. the method according to claim 1, wherein the process for cultivating the Phytolacca acinosa includes: with growth side naturally
Formula culture, and apply the first compound fertilizer；Preferably, the applied amount of first compound fertilizer is 40-80kg/ mus, and described first is multiple
N, P in Hefei2O5、K2The weight ratio of O is 15-20: 8-10: 12.
7. the method according to claim 1, wherein the rice is cadmium high-selenium corn late rice.
8. the method according to the description of claim 7 is characterized in that the cadmium high-selenium corn late rice include cadmium high-selenium corn conventional Rice and
At least one of cadmium high-selenium corn hybrid paddy rice, preferably kind are Yu Zhenxiang.
9. the method according to claim 1, wherein the process for cultivating the rice includes: with growth side naturally
Formula culture, and apply urea；Preferably, the applied amount of the urea is 5-10kg/ mus.
10. according to the method described in claim 9, it is characterized in that, cultivating the process of the rice further include: it is multiple to apply second
Hefei；Preferably, the applied amount of second compound fertilizer is 40-60kg/ mus, N, P in second compound fertilizer2O5、K2O's
Weight ratio is 10-15: 10-15: 15.
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