CN106804351A - A kind of method of heavy metal cadmium content in use silico-calcium phosphate fertilizer reduction rice - Google Patents
A kind of method of heavy metal cadmium content in use silico-calcium phosphate fertilizer reduction rice Download PDFInfo
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- CN106804351A CN106804351A CN201510851286.9A CN201510851286A CN106804351A CN 106804351 A CN106804351 A CN 106804351A CN 201510851286 A CN201510851286 A CN 201510851286A CN 106804351 A CN106804351 A CN 106804351A
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- rice
- silico
- calcium phosphate
- phosphate fertilizer
- cadmium
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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
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
- A01G22/20—Cereals
- A01G22/22—Rice
Abstract
The invention discloses the method for heavy metal cadmium content in a kind of use silico-calcium phosphate fertilizer reduction rice, the method is before rice transplanting, first to be limed in rice field, keeps the water depth 1-1.5cm in rice field；After 5-10 days, then first time silico-calcium phosphate fertilizer is applied in rice field, keep the water depth 2.5-4cm in rice field；The transplanting seedlings after 5 days；When paddy growth to heading stage, second silico-calcium phosphate fertilizer is applied.The present invention further by silico-calcium phosphate fertilizer suppresses enrichment of the cadmium in rice by the cadmium content in lime and silico-calcium phosphate fertilizer curing soil, the cadmium after making by rice absorbing in rice knot fringe as little as possible to spike of rice in shift, cadmium content reduction in rice can be made.
Description
Technical field
The present invention relates to the method for heavy metal cadmium content in a kind of use silico-calcium phosphate fertilizer reduction rice.
Background technology
Applying lime in rice field can improve soil pH, reduce soil extract state Cd contents, reach the effect of Cd in passivation soil.This mainly has two aspect reasons：One is liming so that soil colloids negative electrical charge increases, the adsorption capacity enhancing of heavy metal ion；Another aspect soil pH is improved can make Fe, Mn plasma in soil form hydroxy compounds, there is provided more heavy metal adsorption sites, so that the Cd in soil is difficult to be absorbed by crops.
According to investigations, cadmium has the disguise of stronger animal migration and plant absorption, and " cadmium is a kind of glossiness heavy metal of silvery white, and toxicity is very strong, is hidden up to 10-30 in human body." the cadmium poisoning mostly chronic seizures that are caused by water source or food etc., alimentary canal mucous membrane can be caused to stimulate, there are the symptoms such as nausea,vomiting,diarrhea, stomachache, tic.This slow poisoning is easiest to damage the dirty grade organ of kidney,spleen,liver of people, can also trigger anaemia, reproductive function to decline etc..If long-term intake can be caused cadmium to accumulate in vivo by the food of cadmium pollution, cause malacosteon, have aches and pains all over, be referred to as " itai-itai ".Cadmium is also in itself one of carcinogenic substance, can cause the malignant tumour of lung, prostate and testis.
Substantial amounts of survey data analysis show：Paddy rice is irrigated because of water layer, and soil is often in reducing condition, is the large cereal crops most strong to Cd uptake, and level of its seed containing cadmium is only second to romaine lettuce.Rice cadmium is exceeded mainly relevant with Farmland contamination, and plant absorbs the cadmium in soil, so that the cadmium content of rice increases.Because the average full cadmium content amplitude of variation of China's arable soil is 0.06mg/kg~2.95mg/kg, most of contaminated soil cadmium content is in slight pollution level, and most of Cd concentration of brown rice for being produced is less than state quality standard, for this present situation, take a set of fast and effectively integrated control technique, Cd concentration of brown rice is set to meet national quality of rice standard, to ensuring China's grain quality safety in production, alleviate current Population and land resources contradiction, Ensuring Food Safety has important practical significance.
Rice counts for much as the main cereal crops of China, the safety problem of grain.Content of beary metal is a very important problem in how reducing rice, because absorption of the different parts to Cd is different with enrichment degree in paddy rice, after the Cd in soil is inevitably absorbed by rice crop, if Cd can be made the enrichment of other positions or to shift in suppressing Cd to rice in the paddy rice, and the content of Cd in rice is reduced, so as to realize reducing the purpose of heavy metal cadmium in rice.
The content of the invention
Present invention solves the technical problem that being to reduce the absorption of rice crop heavy metal cadmium, the content of heavy metal cadmium in rice is reduced.
The technical scheme is that, there is provided a kind of method of heavy metal cadmium content in use silico-calcium phosphate fertilizer reduction rice, before rice transplanting, first limed in rice field, keep the water depth 1-1.5cm in rice field；After 5-10 days, then first time silico-calcium phosphate fertilizer is applied in rice field, keep the water depth 2.5-4cm in rice field；The transplanting seedlings after 5 days；When paddy growth to heading stage, second silico-calcium phosphate fertilizer is applied.The present invention further by silico-calcium phosphate fertilizer suppresses enrichment of the cadmium in rice by the cadmium content in lime and silico-calcium phosphate fertilizer curing soil, the cadmium after making by rice absorbing in rice knot fringe as little as possible to spike of rice in shift, cadmium content reduction in rice can be made.
Further, the amount for being limed in rice field is 0.1-0.3 kg/m2。
Further, the dose that first time silico-calcium phosphate fertilizer is applied in rice field is 0.4-0.8 kg/m2。
Further, it is described that second dose of silico-calcium phosphate fertilizer is applied in rice field for 0.8-1.6 kg/m2。
Further, the dose of second silico-calcium phosphate fertilizer is the twice of first time silico-calcium phosphorus dose.
Further, 10-12 days transplanting seedlings after first time silico-calcium phosphate fertilizer are applied in rice field.
The beneficial effects of the invention are as follows, using trade waste silico-calcium phosphate fertilizer, by the cadmium content in lime and silico-calcium phosphate fertilizer curing soil, and further by suppressing enrichment of the cadmium in rice, cadmium after making by rice absorbing in rice knot fringe as little as possible to spike of rice in shift, cadmium content reduction in rice can be made.
Brief description of the drawings
Fig. 1 represents the cadmium content test result figure of the paddy rice each several part in embodiment and comparative example.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
The method that the present embodiment provides heavy metal cadmium content in a kind of use silico-calcium phosphate fertilizer reduction rice, before rice transplanting, first limes in rice field, keeps the water depth 1.2cm in rice field；After 8 days, then first time silico-calcium phosphate fertilizer is applied in rice field, keep the water depth 3cm in rice field；The transplanting seedlings after 11 days；When paddy growth to heading stage, second silico-calcium phosphate fertilizer is applied.The present embodiment further by silico-calcium phosphate fertilizer suppresses enrichment of the cadmium in rice by the cadmium content in lime and silico-calcium phosphate fertilizer curing soil, the cadmium after making by rice absorbing in rice knot fringe as little as possible to spike of rice in shift, cadmium content reduction in rice can be made.
The specific test procedure of the present embodiment is as follows：
Experiment is carried out in Hengyang, Hunan Province county respectively, different treatment plot experiments are set by a certain piece of farmland, the enrichment condition of the Cd in rice is investigated, preliminary scientific basis and technical support is provided to solve farmland soil heavy metals pollution and food-safety problem.
Every kilogram of soil 1mg containing cadmium in the experiment rice field；The cadmium content of rice is tested as experiment soil with the soil containing cadmium.12 cells, common 240m are divided altogether2；Separated with ridge between cell；3 cells are one group of planting experiment.
Experimental procedure：
（1）Divide 3 cells, each plot area 20m2, separated with ridge between cell；
（2）First limed in rice field, each cell 3kg pours water to depth of water 1.2cm；Silico-calcium phosphate fertilizer 6kg is spread after 8 days in rice field；Pour water to depth of water 3cm；Rice seedlings are transplanted after 11；
（3）Rice seedlings are transplanted in the rice field of the soil containing cadmium；Cultivated according to a conventional method afterwards；When paddy growth to heading stage, second silico-calcium phosphate fertilizer 12kg is applied, then keep the water depth 1.5-2cm in rice field until harvesting drains water in first 8 days；
（4）Finally, rice plant is gathered in after harvesting, the content of cadmium in analysis each several part；
During results, rice plant is gathered in back, and Plant samples are first rinsed well with running water, root, stem, leaf, shell after being dried at 65 DEG C（Rice husk）, rice（Rice）Separate, post label in being fitted into sealed bag after the grinding of plant pulverizer determines for content of beary metal；Plant samples use HNO3-HClO4 Wets after crushing, and solution C d contents are determined with ICP-MS after constant volume.
Comparative example 1
The experimental plot of adjacent local subdivided 3 equal area sizes in embodiment 1 is tested as a comparison, paddy rice do not carried out in experiment lime sow and silico-calcium phosphate fertilizer applying, only routinely the implantation methods of paddy rice are cultivated.Each several part cadmium content in paddy rice is tested respectively by identical method finally.
Comparative example 2
The experimental plot of adjacent local subdivided 3 equal area sizes in embodiment 1 is tested as a comparison, and paddy rice carries out sowing for lime as described in Example 1 in experiment, but does not apply silico-calcium phosphate fertilizer, and routinely the implantation methods of paddy rice are cultivated.Each several part cadmium content in paddy rice is tested respectively by identical method finally.
Comparative example 3
The experimental plot of adjacent local subdivided 3 equal area sizes in embodiment 1 is tested as a comparison, and paddy rice applies silico-calcium phosphate fertilizer as described in Example 1 in experiment, but does not carry out sowing for lime, and only routinely the implantation methods of paddy rice are cultivated.Each several part cadmium content in paddy rice is tested respectively by identical method finally.
Result of the test：By above-described embodiment 1 and comparative example 1-3 totally four groups of experiments carry out data collect mapping, as shown in figure 1, in Fig. 1,1., 2., 3., 4. the experiment numbers of embodiment 1 and comparative example 1-3 are respectively.The cadmium content of rice is minimum in embodiment 1, only 0.046ppm, i.e., 0.046mg containing cadmium in every kilogram rice, far below the cadmium content in rice in comparative example.Illustrate that the program can be effectively reduced the content of cadmium in rice.
Claims (5)
1. a kind of method that use silico-calcium phosphate fertilizer reduces heavy metal cadmium content in rice, it is characterised in that before rice transplanting, first limes in rice field, keeps the water depth 1-1.5cm in rice field；After after 5-10 days, then first time silico-calcium phosphate fertilizer is applied in rice field, keep the water depth 2.5-4cm in rice field；After transplanting seedlings after 5-15 days；When paddy growth to heading stage, second silico-calcium phosphate fertilizer is applied;The dose of second silico-calcium phosphate fertilizer is the twice of first time silico-calcium phosphorus dose.
2. the method for claim 1, it is characterised in that the amount limed in rice field is 0.1-0.3 kg/m2。
3. the method for claim 1, it is characterised in that the dose that first time silico-calcium phosphate fertilizer is applied in rice field is 0.4-0.8 kg/m2。
4. the method for claim 1, it is characterised in that described second dose of silico-calcium phosphate fertilizer is applied in rice field is 0.8-1.6 kg/m2。
5. the method for claim 1, it is characterised in that 10-12 days transplanting seedlings after first time silico-calcium phosphate fertilizer are applied in rice field.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302964A (en) * | 2018-12-12 | 2019-02-05 | 湖南袁禾农业科技有限公司 | Cadmium rice and its implantation methods drop |
| CN109496733A (en) * | 2018-11-02 | 2019-03-22 | 华南农业大学 | A kind of silicon element split application method reducing rice grain cadmium content under high concentration cadmium pollution |
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| CN102174326A (en) * | 2011-03-11 | 2011-09-07 | 中国科学院亚热带农业生态研究所 | Heavy metal composite passivating agent used for paddy soil and preparation method thereof |
| CN103053255A (en) * | 2012-12-31 | 2013-04-24 | 广东省农业科学院农业资源与环境研究所 | Fertilizing method for reducing cadmium content of leafy vegetables in overproof cadmium vegetable plot |
| CN104041362A (en) * | 2014-05-13 | 2014-09-17 | 农业部环境保护科研监测所 | Method for safely producing rice in rice field with serious Cd pollution |
| CN104478636A (en) * | 2014-12-15 | 2015-04-01 | 湖南省土壤肥料研究所 | Alkaline slow-release compound fertilizer capable of regulating soil acidity and reducing cadmium content of rice and preparation method thereof |
| CN105075763A (en) * | 2015-08-21 | 2015-11-25 | 常州大学 | Silicon applying method for lowering concentration of cadmium of rice in rice field heavily polluted by cadmium |
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2015
- 2015-11-30 CN CN201510851286.9A patent/CN106804351A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102174326A (en) * | 2011-03-11 | 2011-09-07 | 中国科学院亚热带农业生态研究所 | Heavy metal composite passivating agent used for paddy soil and preparation method thereof |
| CN103053255A (en) * | 2012-12-31 | 2013-04-24 | 广东省农业科学院农业资源与环境研究所 | Fertilizing method for reducing cadmium content of leafy vegetables in overproof cadmium vegetable plot |
| CN104041362A (en) * | 2014-05-13 | 2014-09-17 | 农业部环境保护科研监测所 | Method for safely producing rice in rice field with serious Cd pollution |
| CN104478636A (en) * | 2014-12-15 | 2015-04-01 | 湖南省土壤肥料研究所 | Alkaline slow-release compound fertilizer capable of regulating soil acidity and reducing cadmium content of rice and preparation method thereof |
| CN105075763A (en) * | 2015-08-21 | 2015-11-25 | 常州大学 | Silicon applying method for lowering concentration of cadmium of rice in rice field heavily polluted by cadmium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109496733A (en) * | 2018-11-02 | 2019-03-22 | 华南农业大学 | A kind of silicon element split application method reducing rice grain cadmium content under high concentration cadmium pollution |
| CN109302964A (en) * | 2018-12-12 | 2019-02-05 | 湖南袁禾农业科技有限公司 | Cadmium rice and its implantation methods drop |
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Application publication date: 20170609 |