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Phytoremediation method for cadmium polluted farmland

A phytoremediation and cadmium-polluted technology, which is applied in the field of phytoremediation of cadmium-contaminated farmland, can solve the problems of limited number of cadmium hyperaccumulator plants, unknown growth habits, and unsatisfactory effects, so as to achieve clear growth and cultivation habits, and harvest period Short, low-cost effect

Inactive Publication Date: 2011-07-06
SOUTH CHINA BOTANICAL GARDEN CHINESE ACADEMY OF SCI
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Problems solved by technology

At present, the number of cadmium hyperaccumulator plants that have been discovered is limited, and their biomass is low, or they are not easy to cultivate, or their growth habits are not understood. Usually, there are certain limitations in practical application, and the effect is not ideal.

Method used

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Embodiment Construction

[0013] Below in conjunction with specific embodiment the present invention is described in detail as follows:

[0014] The cadmium removal test was carried out on the polluted cultivated land in Wengyuan County, northern Guangdong, and a cultivated land with an average cadmium content of 2.58mg / kg was planted.

[0015] 1. Use grain amaranth and big red amaranth as cultivated plants. The first factory planted grain amaranth. When the spring temperature in the south is high, that is, in mid-March, sow grain amaranth with 500 g seeds per mu, and apply 1000 kg / mu of organic fertilizer and chlorine Potassium 80kg / mu, when the height of the seedlings is 12-13cm, the seedlings are thinned and the seedlings are fixed, and the distance between the plants and the rows is 50 cm to 20 cm. After growing to 60 days, the above-ground plants are cut and stubbled at 40 cm, and 4-5 functional leaves are reserved. Apply 50kg / mu of urea after mowing, 50kg / mu of potassium chloride, repeat mowing o...

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Abstract

The invention relates to a phytoremediation method for a cadmium polluted farmland, comprising the following steps of: in a cadmium polluted farmland containing cadmium of below 8mg / kg, planting grain amaranth and red leaf amaranth in a crop rotation mode, applying potassium fertilizer, harvesting for many times, and concentrating all plant materials for landfill. According to the phytoremediation method for a cadmium polluted farmland, planting is performed thrice per year, wherein the grain amaranth is planted twice, and the red leaf amaranth with a short crop rotation period is planted between double planting of the grain amaranth, thus optimizing the arrangement of crop rotation; and on management, the grain amaranth planted for the first time is cut twice to fully utilize the favorable growing conditions in summer and accumulate more biomass, and the grain amaranth planted finally is not cut but grows to be ripe, thus optimizing the accumulation of biomass and the work efficiency. Such a crop rotation mode fully utilizes the planting time in a year, and is conductive to the growth of the grain amaranth planted thirdly. The invention has the advantages of high efficiency, easiness in operate, no secondary pollution and low cost.

Description

technical field [0001] The invention relates to a technology for repairing cadmium-contaminated soil in environmental protection, that is, a phytoremediation method for cadmium-contaminated farmland. Background technique [0002] With the rapid development of our country's economy, on the one hand, people's living standards have been continuously improved, but on the other hand, it has brought serious environmental pollution. At present, the area of ​​land polluted by heavy metals in my country is very large. The area of ​​cultivated land polluted by heavy metals such as cadmium, arsenic, chromium and lead reaches 20 million hectares, accounting for about 1 / 5 of the total cultivated land area. According to a survey organized by the State Environmental Protection Administration, the Pearl River Delta, the Yangtze River Delta, and the Bohai Sea Rim, where the economy developed first, have serious soil pollution problems. Among them, 40% of the farmland in the Pearl River Delta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 李志安李凝玉邹碧王刚夏汉平庄萍王法明
Owner SOUTH CHINA BOTANICAL GARDEN CHINESE ACADEMY OF SCI
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