CN107889705A - Rice base applies passivator drop living imposed with tillering stage and combining for iron fertilizer root control drops cadmium method - Google Patents
Rice base applies passivator drop living imposed with tillering stage and combining for iron fertilizer root control drops cadmium method Download PDFInfo
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- CN107889705A CN107889705A CN201711183859.0A CN201711183859A CN107889705A CN 107889705 A CN107889705 A CN 107889705A CN 201711183859 A CN201711183859 A CN 201711183859A CN 107889705 A CN107889705 A CN 107889705A
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- rice
- cadmium
- soil
- iron fertilizer
- iron
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C21/00—Methods of fertilising, sowing or planting
Abstract
The present invention, which provides rice base and applies passivator drop and live in imposing with tillering stage, drops cadmium method combining for iron fertilizer root control.This method is the 300kg/ mus of the alkaline passivation such as base liming material 100 before Rice Cropping；In rice tillering early stage, soil semi-moist state is kept, 7.5kg/ mus iron fertilizer is uniformly manured into soil, waterflooding is to rice milky ripe stage or more late after the 2d that applies fertilizer.This method collection applies the activity of passivator reduction Cadmium in Soil and the resistance cadmium by imposing iron fertilizer enhancing root surface of rice iron film acts on one.For the exceeded acid soil of mild or moderate cadmium, with control, independent base liming, iron fertilizer, lime are individually imposed compared with iron fertilizer mixed base applies processing, and joint drop reduces 74.6 75.4%, 52.6 57.1%, 66.7 69.4%, 45.5 51.6% respectively every method Brown Rice cadmium concentration.
Description
Technical field
The present invention relates to mild or moderate polluted agricultural land safety production technique field, especially mild or moderate Cd-polluted farmland rice to pacify
Full production technology.Specifically a kind of rice base applies passivator drop living imposed with tillering stage and combining for iron fertilizer root control drops cadmium method.
Background technology
Farmland cadmium pollution directly threatens agricultural products in China quality safety and agricultural sustainable development, such as Guangdong Hunan etc.
Cadmium rice event.For the features such as cadmium pollution degree in China farmland is low, area is big and farmland is agricultural, need badly and research and develop efficient, warp
Ji, quick, easy, the reproducible farmland safe utilization technology easily promoted.At present on cadmium pollution soil improvement and safe utilization
Research have a lot, including low cadmium-accumulation breed breeding, passivator development and application, planting system adjustment are with agronomic technique etc..
Low cadmium-accumulation kind is often difficult to take into account yield and quality simultaneously, and actual large scale application is actually rare；Passivator development
More, mainly including lime, organic fertilizer, charcoal, sepiolite, hydroxyapatite etc., it is mainly by improving soil pH, changing
Become the form of cadmium, reduce effective cadmium content in soil, absorption of the rice to cadmium can be reduced to a certain degree.But applying alkalescence
Under the conditions of passivator improves pH, the formation and its resistance cadmium effect of root surface of rice iron film can weaken, and bar is applied in wherein alkaline passivation agent
Free state Fe under part2+It is wherein one of key factor that concentration, which declines, and a small amount of Fe is added in passivator2+, due to blunt
Agent strong basicity feature, the validity of iron are also very low.Based on such imagination, we are verified by multiple spot field test, invention
Rice field base applies passivator drop living imposed with tillering stage and combining for iron fertilizer root control drops cadmium method.
The content of the invention
The present invention low Cd-polluted farmland safety production technique needs in being directed to, there is provided rice base liming, and in rice point
Tiller soil early stage imposes the joint drop cadmium method of iron fertilizer.For the acid exceeded soil of mild or moderate cadmium, this method collection liming etc.
Alkaline passivation agent reduces the activity of Cadmium in Soil and imposes the fertile resistance cadmiums for increasing root surface of rice iron film of Fe by the critical period and acts on
One.For the exceeded acid soil of mild or moderate cadmium, with compareing, independent base liming, individually impose iron fertilizer, lime and iron fertilizer and mix
Base is closed to apply processing and compare, joint drop every method Brown Rice cadmium concentration reduce respectively 74.6-75.4%, 52.6-57.1%,
66.7-69.4%, 45.5-51.6%.
The general alkalescence of acid soil heavy metal passivating material is stronger, directly spreads fertilizer over the fields rice leaf or spreads fertilizer over the fields uneven possibility
Paddy growth is damaged, while the needs based on farming operations, passivating material are typically applied as base.Base applies passivating material can
Effectively to reduce the biological effectiveness of Cadmium in Soil, absorption of the rice to cadmium is reduced, but comparatively rice seedling heavy metal is inhaled
Receipts amount is less.Tiller-boot stage is the main period of vegetative growth of rice plants, and root growth is rapid, and rice root is to nutrient
While absorption and accumulation, also by a large amount of absorption and accumulations of heavy metal ion.South China major part rice soil is in itself in acidity, soil
The activity of iron is higher in earth, and the administration of passivator improves soil pH, reduces the effective cadmium content of soil, while also reduces iron
Validity, inhibit to a certain extent root surface of rice iron film formation and its resistance cadmium effect.And tiller-boot stage is water
The critical period that rice root border cells are formed, the iron fertilizer validity being manured into soil in tillering stage is high, advantageously in root surface of rice iron
The formation of film, and then hinder absorption of the control rice to cadmium.
The technical solution adopted in the present invention is：A kind of rice base applies passivator drop work and imposes iron fertilizer root control with tillering stage
Joint drop cadmium method, is 1 week before rice growing or transplanting, base applies alkaline passivation material 100-300kg/ mus；In paddy growth
To tillering stage, soil is kept to semi-moist state, 7.5kg/ mu iron fertilizers are dissolved in water uniformly spilt and impose on soil surface or and chase after
Fertilizer mixing is manured into soil, and keeps waterflooding to be harvested to milk stage or more late after rice maturation after the 2d that applies fertilizer.
In the inventive method, base is applied the specific dosage of alkaline passivation material and determined by agricultural land soil pH value：PH≤6, apply 150-
300kg/ mus；6 ＜ pH≤6.5, apply 100-150kg/ mus.
Heretofore described alkaline passivation material can be the materials such as quick lime, white lime, agstone, alkaline residue.
The heretofore described preferred FeSO of iron fertilizer4.The Dressing date of iron fertilizer is preferably rice tillering early stage, that is, starts to occur
During second tiller.
The present invention compares the effect of several method, and result of the test shows, several method can reduce Brown Rice cadmium and contain
Amount.Compared with the control, independent base liming, individually impose iron fertilizer, lime and iron fertilizer mixed base apply, base liming and tillering stage
Impose iron fertilizer integrated processes brown rice cadmium concentration reduces 42.6-46.5%, 19.7-23.9%, 49.2-53.5%, 74.6- respectively
75.4%, wherein base applies living optimal, its brown rice cadmium concentration that drops cadmium method of combining that iron fertilizer root control is imposed with tillering stage of passivator drop
Than independent base liming, individually impose iron fertilizer, lime and iron fertilizer mixed base and apply processing and reduce 52.6-57.1%, 66.7-
69.4%th, 45.5-51.6%.
The inventive method, which not only overcomes, to be applied passivator due to base and causes in soil iron activity to reduce, and is unfavorable for root surface of rice
Iron film is formed and resistance cadmium effect；Overcome again and apply iron fertilizer (FeSO merely4) problem of Cadmium in Soil validity can not be effectively reduced,
Rice drop cadmium effect can effectively be lifted.Method is simple and easy, cost is cheap.
Embodiment
Embodiment：(Jiangxi Guixi, Tongling, Anhui Province)
In pH4.9, full cadmium 0.75mg/kg Jiangxi Guixi rice field, varieties of plant newly accounts for that (Jiangxi Xingan kind industry has to be U.S. fragrant
Limit company)；In pH5.6, full cadmium 0.62mg/kg Tongling, Anhui Province rice field, varieties of plant is that brilliant two excellent China account for (Yuan Longping's agricultural
High-tech limited company).On the basis of base applies 200kg/ mu lime, early stage is applied 7.5kg/ mus FeSO in tiller4, after 2d
Field keeps waterflooding to be harvested to milk stage after rice maturation, result of the test such as table 1：
Table 1
Note：For each group in addition to processing mode is different, other conventional cultivations are consistent in table.
More than in 2 kinds of exceeded Acid Paddy Soils of mild or moderate cadmium, control treatment Brown Rice cadmium concentration exceedes state food
, serious human health risk be present in 3 times or so of threshold limit values standard (0.2mg/kg).Independent base liming is individually dividing
The tiller phase, which imposes iron fertilizer, can reduce cadmium concentration in brown rice, but cadmium concentration is 0.35-0.54mg/kg in brown rice, still beyond country's food
Product threshold limit values standard.Lime applies drop cadmium effect slightly better than processing is singly applied with iron fertilizer mixed base, and brown rice cadmium concentration is 0.31-
0.33mg/kg, but still it is exceeded.And the basic matterial such as base liming, and impose in tillering stage iron fertilizer to significantly reduce brown rice cadmium dense
Degree reaches 74.6-75.4%, and its concentration is 0.15-0.18mg/kg, meets state food threshold limit values standard, is available for eating safely
With, and slightly increase production than control.
Examples detailed above shows, in the exceeded Acid Paddy Soils of mild or moderate cadmium, the alkaline passivation material such as base liming, and in water
Rice tiller is imposed with appropriate iron fertilizer early stage, can effectively lower Brown Rice Cd contents.
Claims (4)
1. a kind of rice base, which applies passivator drop living imposed with tillering stage, drops cadmium method combining for iron fertilizer root control, it is characterised in that：It is
1 week before rice growing or transplanting, base applies alkaline passivation material 100-300kg/ mus；In paddy growth to tillering stage, soil is kept
Earth, which to semi-moist state, by 7.5kg/ mu iron fertilizers is dissolved in water and uniformly spills to impose on soil surface or mix with top dressing, to be manured into soil,
Waterflooding is kept to be harvested to milk stage or more late after rice maturation after fertilising 2d.
2. according to the method for claim 1, it is characterised in that described iron fertilizer is FeSO4。
3. according to the method for claim 1, it is characterised in that the Dressing date of iron fertilizer is rice tillering early stage, that is, is started
When there is second tiller.
4. according to the method for claim 1, it is characterised in that base applies the specific dosage of alkaline passivation material by agricultural land soil pH
Value determines：PH≤6, apply 150-300kg/ mus；6 ＜ pH≤6.5, apply 100-150kg/ mus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711183859.0A CN107889705B (en) | 2017-11-23 | 2017-11-23 | Combined cadmium reduction method for rice basal application passivant viability reduction and additional iron fertilizer root control in tillering stage |
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| CN201711183859.0A CN107889705B (en) | 2017-11-23 | 2017-11-23 | Combined cadmium reduction method for rice basal application passivant viability reduction and additional iron fertilizer root control in tillering stage |
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| CN107889705A true CN107889705A (en) | 2018-04-10 |
| CN107889705B CN107889705B (en) | 2020-11-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109609131A (en) * | 2019-01-24 | 2019-04-12 | 中国科学院南京土壤研究所 | A kind of iron-based conditioner and its preparation method and application for reducing rice cadmium |
| CN111019666A (en) * | 2019-07-04 | 2020-04-17 | 湖南科技大学 | Modifier and preparation method thereof and method for blocking heavy metal absorption of crops |
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| CN102972114A (en) * | 2012-11-28 | 2013-03-20 | 中国水稻研究所 | Fertilizer applying method for controlling heavy metal cadmium accumulation of rice |
| CN103004439A (en) * | 2012-12-25 | 2013-04-03 | 湖南省土壤肥料研究所 | Combined prevention and control method for cadmium exceeding of rice in medium-light cadmium-polluted soil |
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| CN102972114A (en) * | 2012-11-28 | 2013-03-20 | 中国水稻研究所 | Fertilizer applying method for controlling heavy metal cadmium accumulation of rice |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109609131A (en) * | 2019-01-24 | 2019-04-12 | 中国科学院南京土壤研究所 | A kind of iron-based conditioner and its preparation method and application for reducing rice cadmium |
| CN111019666A (en) * | 2019-07-04 | 2020-04-17 | 湖南科技大学 | Modifier and preparation method thereof and method for blocking heavy metal absorption of crops |
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