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Method for lowering heavy-metal superstandard risk of soil of perennial continuous cropping facilities

A technology of heavy metals and heavy metal passivators, applied in the direction of soil preparation methods, soil conditioning materials, chemical instruments and methods, etc., to achieve the effect of improving soil structure and soil biological environment, deep root system, and strong adaptability

Inactive Publication Date: 2018-11-30
INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods are mainly chemical remediation, mainly aimed at the passivation of effective heavy metals, and do not involve physical and phytoremediation measures

Method used

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  • Method for lowering heavy-metal superstandard risk of soil of perennial continuous cropping facilities
  • Method for lowering heavy-metal superstandard risk of soil of perennial continuous cropping facilities
  • Method for lowering heavy-metal superstandard risk of soil of perennial continuous cropping facilities

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Preparation of heavy metal passivation agent: chop rice straw into small pieces of about 3 cm, wash and air-dry naturally, put it into a vacuum tube furnace for pyrolysis, and the final temperature of pyrolysis is 500°C, keep it warm for 1 hour, take it out, and let it cool naturally At room temperature, straw biochar was prepared, with pH and EC of 9.68 and 3.21 mS / cm, respectively; zeolite and expanded vermiculite were purchased from the market, with pH of 8.73 and 6.91, and EC of 0.06 and 0.17 mS / cm, respectively. After the three raw materials are passed through a 40 mesh or 10 mesh sieve, they are mixed evenly in a weight ratio of 10:8:4;

[0025] (2) Select a facility greenhouse vegetable field as the test object. The facility vegetable field has been continuously cropped for 5 years, the soil pH value is 6.53, and the total Cu and Cd contents are 120 and 0.48 mg / kg, respectively. After harvesting the last crop of vegetables in mid-June, thoroughly remove disea...

Embodiment 2

[0036] (1) Preparation of heavy metal passivation agent: biochar, zeolite and expanded vermiculite were all purchased from the market, and the raw material of biochar was wheat straw, which was produced in a continuous vertical biomass carbonization kiln. The value and EC are 10.53 and 5.98 mS / cm, respectively. The pH values ​​of zeolite and expanded vermiculite were 7.46 and 7.49, and the EC were 11.1 and 17.0 μS / cm, respectively. After the three raw materials are passed through a 60-mesh or 20-mesh sieve, they are mixed evenly in a weight ratio of 8:5:3;

[0037] (2) A multi-year continuous cropping vegetable base was selected as the test object. The soil pH value of the vegetable field in this facility was 6.98, and the total Cd content was 1.08 mg / kg, which was 2.7 times higher than the national soil quality secondary standard (GB 15618-2008). After harvesting the last crop of vegetables, thoroughly remove the sick roots and field weeds, ventilate and dry the greenhouse, ...

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Abstract

The invention discloses a method for lowering heavy-metal superstandard risk of soil of perennial continuous cropping facilities. Through applying a heavy-metal passivator and combining the methods ofsoil deep-plowing, moisture regulation and control, catch crop planting and the like, the total amount and availability of heavy metals such as Cd and Cu in topsoil of a facility vegetable plot can be obviously lowered, meanwhile, the air and water permeability of the soil is improved, the phenomena such as secondary salinization and acidification of the soil are improved, and thus, the safe production of facility vegetables is guaranteed. The method is suitable for being applied to the soil of the perennial continuous cropping facilities.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal-contaminated soil, in particular to a method for reducing the risk of excessive heavy metals in the soil of multi-year continuous cropping facilities. Background technique [0002] With the optimization and adjustment of my country's planting industry structure, facility vegetables have developed rapidly. According to statistics, in 2016, the vegetable area of ​​various facilities in China has reached 3.9 million hm 2 , mainly distributed in Shandong, Liaoning, Hebei, Jiangsu, Zhejiang and other places. Especially in the northern region of my country, facility vegetables have improved the level of annual vegetable production and balanced supply, narrowed the seasonal difference in vegetable prices, and have become a pillar industry in many places. In the process of increasing agricultural efficiency, increasing farmers' income and promoting rural economic development played a very import...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02A01G22/20A01G22/05C09K17/04C09K101/00
CPCA01B79/02A01G22/05A01G22/20C09K17/04
Inventor 吴萍萍李录久王静李敏
Owner INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI
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