Method for restoring heavy metal contaminated soil through paddies

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil and other directions, can solve the problems affecting the normal production of rice and the inedibility of rice, and achieve the effect of soil remediation, food security and food safety.

Inactive Publication Date: 2016-08-03
XIANNING AGRI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these methods are implemented, the rice will not be edible, which will affect the normal production of rice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Implementation example 1: Soil sample testing: PH value 7.0, Cd1.5mg / kg, As27.9mg / kg, Pb93.9mg / kg, according to the soil environmental quality standard (GB15618-1995), Cd and As exceed the standard, and Pb does not exceed the standard.

[0016] In the first year, a comparison test of middle and late rice varieties was carried out on this soil.

[0017] Comparison test of mid-season rice varieties: the tested varieties were Guangliangyouxiang 66, Luoyou 8, Xinliangyou 223, Jingliangyou 10, Yangliangyou 6, Shenliangyou 5814, Xinliangyou 6, Guangliangyou You 15, Fengliangyou No. 4, Fengliang Youxiang No. 1, etc. are compared by large areas. Each variety has 1 large area, each area is 0.2 mu, and it is sown on May 9. The cultivation and management measures are based on the local field production habits. Implementation, after harvesting rice and straw samples for testing. According to the test results, the Cd and As of Xinliangyou 223 and Shenliangyou 5814 did not exceed ...

Embodiment 2

[0021] Implementation example 2: Soil sample detection: PH value 7.0, Cd0.67mg / kg, As17.6mg / kg, Pb42.6mg / kg, according to the soil environmental quality standard (GB15618-1995), Cd slightly exceeds the standard, As and Pb do not exceed the standard;

[0022] In the first year, a comparative test of early, middle and late rice varieties was carried out on this soil.

[0023] Comparison test of early rice varieties: participating varieties Liangyou 287, Jinyou 402, Liangyou 76, Zhongjiuyou 547, Ezao 18, etc., using large-scale comparisons, one large area for each variety, 0.2 mu for each large area, April The seeds were sown on the 12th, and the cultivation and management measures were implemented in accordance with the local field production habits. After maturity, the rice and straw were harvested and samples were sent for testing. According to the test results, Liangyou 287, Jinyou 402, and Ezao 18 did not exceed the standard Cd, and all other rice varieties had Cd exceedin...

Embodiment 3

[0028] Implementation example 3: Soil sample detection: PH value 6.2, Cd0.55mg / kg, As21.7mg / kg, Pb23.0mg / kg, according to the soil environmental quality standard (GB15618-1995), Cd exceeds the standard, Ab and Pb do not exceed the standard;

[0029] In the first year, a comparative test of early, middle and late rice varieties was carried out.

[0030] Comparison test of early rice varieties: participating varieties Liangyou 287, Jinyou 402, Liangyou 76, Zhongjiuyou 547, Ezao 18, etc., using large-scale comparisons, one large area for each variety, 0.2 mu for each large area, April The seeds were sown on the 12th, and the cultivation and management measures were implemented in accordance with the local field production habits. After maturity, the rice and straw were harvested and samples were sent for testing. According to the test results, in rice, all varieties of Cd do not exceed the standard, rice straw has the most Cd absorption in Liangyou 76, and Liangyou 76 is the be...

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PUM

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Abstract

The invention provides a method for restoring heavy metal contaminated soil through paddies. The method includes the following steps that (1) various main cultivated paddy varieties are used for variety comparative testing for heavy metal contaminated soil, and by detecting the rice heavy metal absorption capacity and the straw heavy metal absorption capacity, the paddy varieties with the rice heavy metal absorption capacity not exceeding the standard and the straw heavy metal absorption capacity being high are selected out; (2) paddies of the selected varieties are planted in the heavy metal contaminated soil; (3) cultivation and management are conducted according to conventional technologies; and (4) the rice is harvested for eating, and all the straw is harvested to be used as industrial raw materials without being returned to fields. The method for restoring the heavy metal contaminated soil through the paddies has the beneficial effect that the problems that in the prior art, the normal paddy production is affected, the land has no yield, no economic benefits are made, and only a certain piece of heavy metal is restored are solved; and by means of the method, the normal paddy production is not affected, the grain safety and food safety are guaranteed while the normal land yield is achieved, soil restoration is achieved, and various pieces of heavy metal can be restored.

Description

technical field [0001] The invention relates to the field of protection of cultivated land resources and treatment of polluted soil, in particular to a method for repairing heavy metal polluted soil by using rice. Background technique [0002] With the mining of mines, the development of metal smelting industry and the extensive application of chemical fertilizers and pesticides, the pollution of heavy metals in farmland soil has become increasingly prominent. Heavy metal pollution in rice field soil not only hinders the growth and development of rice and reduces yield, but also accumulates a large amount of toxic heavy metals in rice and transmits them through the food chain, posing a serious threat to the life safety and health of humans and animals, directly affecting my country's food security. [0003] At present, the remediation of heavy metal contaminated soil mainly adopts physical chemical technology and phytoremediation technology. Among them, the phytoremediation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/105
Inventor 沈其文黄志谋姜华
Owner XIANNING AGRI ACADEMY OF SCI
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