Screening method for heavy metal low accumulated and low enriched vegetable variety

Abstract

The invention discloses a method for sifting a vegetable breed with low-accumulated/low-enriched heavy metals and belongs to the technical field of the quality safety of a farm product. The method comprises the following steps: (1) a potted plant mode is carried out in a greenhouse or a big shed; (2) sifting is carried out from four classes of vegetables, namely lefty vegetable, rhizome, solanaceous fruit and melon; (3) according to the limited values of the detected elements Hg, As, Pb and Cd for heavy-metal pollution in the vegetables regulated by the state and the concentration grads of 0 time, 0.5 time, 1.5 times and 4.5 times, heavy metals are added into potted soil manually; (4) vegetables are subjected to seedling, planting and management; and (5) the contents and the outputs of the heavy metals in an edible part of a product are mensurated; the product which meets the highest concentration treatment, has no marked reduction of average output per plantlet compared with the contrast and does not exceed the standard of the contents of the heavy metals is selected as the vegetable breed with low-accumulated/low-enriched heavy metals. The method has simple operation, wide applicability, economy and high efficiency, and can be popularized and applied to the departments of vegetable layout, planning and production.

Description

technical field [0001] The invention relates to the technical field of agricultural product quality and safety, in particular to a screening method for low-accumulation / low-enrichment vegetable varieties of heavy metals. Background technique [0002] With the development of urbanization, the discharge of urban domestic waste and "three wastes" from factories is also increasing. The unreasonable use of pesticides and fertilizers, as well as the use of sewage and sludge have seriously polluted the water, soil and air in the area, causing vegetables The ecological environment of the production area is deteriorating day by day. Pollutants containing heavy metals enter the soil through various channels, and then pollute vegetables, resulting in heavy metal pollution of vegetables grown on these soils. At present, the heavy metal pollution situation in my country's vegetable production areas is not optimistic. A preliminary survey of soil in economically developed areas led by the...

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Problems solved by technology

[0007] The purpose of the present invention is to aim at the defects that the existing technology of using enriched plants to remediate soil heavy metal pollution is limited by the region and cannot be implemented due to too long repair period; Environmental options are getting smaller and smaller and can not directly change the shortcomings of heavy metal content in vegetables; provide a clear standard, easy operation, wide applicability, cost-effective, and can limit the heavy metal content of vegetable products from the source within a safe range. Method for screening and promoting planting of vegetable varieties with low accumulation / low enrichment of heavy metals

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