Repairing method of cadmium polluted farmlands and applications thereof

Abstract

The invention provides a repairing method of cadmium polluted farmlands and applications thereof, and relates to the technical field of agricultural plantation. According to the repairing method, cornand amaranth are intercropped in a cadmium polluted farmland; and the intercropping mode is as follows: (1) corn plants are planted in wide rows and narrow rows, between two neighbored wide corn rows, one to two rows of amaranth plants are planted; (2) corn plants are planted in rows with equal spacing, and between two neighbored corn rows, one to two rows of amaranth plants are planted; and (3)four rows of corn plants and four rows of amaranth plants are planted at intervals alternatively. The provided repairing method can obviously improve the efficiency of repairing cadmium polluted farmlands; the cadmium removal rate is increased to 363.1 to 873.4 mg / mu; the corn output is barely influenced; and the output is increased by 10.5%.

Description

technical field [0001] The invention belongs to the technical field of agricultural planting, and in particular relates to a method for repairing cadmium-contaminated farmland and its application. Background technique [0002] Due to the long-term irrigation of farmland sewage, the use of pesticides and fertilizers, the development of mineral resources, the development of industrial production and other human factors, as well as natural factors such as earthquakes, volcanic eruptions, weathering of heavy metal bedrock and geological processes, the pollution of heavy metals in farmland has become increasingly serious. Affected by heavy metal pollution, my country's grain production is reduced by 10 million tons every year, and the direct economic loss exceeds 20 billion yuan. In addition, heavy metals in farmland ecosystems can also pass along the food chain, endangering human health. Therefore, the remediation of heavy metal pollution in farmland soil is urgent. [0003] A...

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Problems solved by technology

However, the enrichment plants used for phytoremediation are usually small, grow slowly, and have a long restoration period, which limits the promotion of phytoremediation; and because large-scale monoculture super-enrichment plants will affect food production, it is not suitable for my country's extremely tight arable land resources. In addition, the area of ​​cultivated land polluted by medium and light heavy metals in my country accounts for about 5.32% of the total cultivated land area. It is not advisable to fallow a large area of ​​cultivated land polluted by medium and light heavy metals, and it is possible to plant crops on farmlands polluted by medium and light heavy metals. It does not exceed the standard temporarily, but heavy metals are always stored in the soil. As the environment changes, the availability of cadmium in the soil may change, and there is always a risk of heavy metals exceeding the standard in crops. Therefore, it is necessary to find a new planting mode that can be used in actual production. Under the premise of ensuring agricultural production, at the same time taking into account the restoration of heavy metal pollution in farmland soil, and gradually reducing the risk of crops exceeding the standard

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