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A method for repairing cadmium-contaminated farmland soil by using rapeseed-middle rice rotation

A technology for cadmium pollution and soil, applied in the field of soil remediation, can solve problems such as no economic benefits, short plants, seasonal restrictions, etc., to achieve the effect of improving the repair effect, increasing the absorption capacity, and ensuring safe production

Active Publication Date: 2020-09-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a method for repairing cadmium-contaminated farmland soil by using rapeseed-middle rice rotation, which can solve the problems of short plants, seasonal restrictions, and no economic benefits in the phytoremediation process, and can be completed under the premise of ensuring the safe production of crops. The phytoremediation of cadmium-contaminated soil has a remarkable remediation effect, realizing the purpose of remediation while production

Method used

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  • A method for repairing cadmium-contaminated farmland soil by using rapeseed-middle rice rotation
  • A method for repairing cadmium-contaminated farmland soil by using rapeseed-middle rice rotation
  • A method for repairing cadmium-contaminated farmland soil by using rapeseed-middle rice rotation

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The test site is located on the cadmium-contaminated farmland in Lijinyuan Village, Qujiang District, Quzhou City, Zhejiang Province. The cadmium content is 0.86mg / kg, which exceeds the limit value for farmland in the soil environmental quality standard (GB15618-2008).

[0042] In this embodiment, the method for repairing cadmium-contaminated farmland by using high-enrichment rapeseed and low-accumulation middle-season rice rotation comprises the following steps:

[0043] (1) At the beginning of October of the first year, the cadmium-contaminated farmland soil to be restored was prepared and weeded, and activated base fertilizer was applied to the soil during the land preparation process. After the land preparation was completed, the seeds of Rapeseed Lvsheng No. Cultivation and management of cadmium-contaminated farmland soil to be repaired;

[0044] The activated base fertilizer is Ladomex fulvic acid potassium nitrate type (15-15-15), and the application rate is 30kg...

Embodiment 2

[0062] The test site is located on the cadmium-contaminated farmland in Changxing County, Huzhou City, Zhejiang Province. The cadmium content is 0.58mg / kg, which exceeds the limit value for farmland in the soil environmental quality standard (GB15618-2008).

[0063] This example is planted with reference to Example 1, the difference is that the variety of rice is Yongyou 538 (conventional commercial variety), and the application rate of the soil passivation conditioner per mu is 300kg / mu.

[0064] A control is set for this embodiment, and the control is completely the same as in Example 1 except that no activated base fertilizer, foliar activator, passivation conditioner and foliar inhibitor are applied.

[0065] The test results are as follows:

[0066] Such as figure 1 As shown, in the two implementation cases, under the condition of spraying activator or inhibitor, rape and rice can grow normally, and their yields are all increased. In Example 1, the yield of rapeseed was...

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Abstract

The invention discloses a method for remediating cadmium-contaminated farmland soil by utilizing rape-middle-season rice rotation. The method comprises the following steps: in a first year, soil preparation is performed on the cadmium-contaminated farmland soil to be remediated, an activated base fertilizer is applied to the soil, and Cd-hyperaccumulation rape seeds are sown in a broadcast sowing manner; a foliar activator is sprayed to rapes in the bolting and flowering stages of the rapes; in a second year, the rapes are harvested; after the rapes are harvested, a passivation conditioning agent is applied into the soil, harrowing and waterflooding are performed uniformly, cadmium low-accumulation middle-season rice seeds are directly sown into the cadmium-contaminated farmland soil, and cultivation management is performed; in the tillering, booting and grain-filling stages of middle-season rice, a foliar inhibitor is sprayed to the middle-season rice; and after the rice is ripened, the middle-season rice is harvested. The method provided by the invention adopts the Cd-hyperaccumulation rape and cadmium low-accumulation middle-season rice rotation system, the system cooperates with the activated base fertilizer, the foliar activator, the passivation conditioning agent and the foliar inhibitor, so that the absorption of cadmium in the soil to be remediated by the rapes and the rice is significantly improved, and the remediation effect on the cadmium-contaminated farmland soil is further improved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating cadmium-contaminated farmland soil by using rapeseed-middle rice rotation. Background technique [0002] In recent decades, due to human activities such as the discharge of industrial waste and the application of chemical fertilizers, a large amount of heavy metals have been discharged into the environment, resulting in heavy metals in cultivated land seriously exceeding the standard. Soil heavy metal pollution is one of the environmental problems in our country and even in the world. [0003] According to the National Soil Pollution Survey Bulletin in 2014, the rate of points exceeding the standard in cultivated land in my country is as high as 19.4%, among which cadmium is the primary pollutant. The annual production of agricultural products with excessive cadmium content has exceeded 1.46 billion kilograms, and cadmium will pass through the fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
CPCB09C1/105
Inventor 杨肖娥曹雪蕊王小子林强陆敏童文彬
Owner ZHEJIANG UNIV
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