Mixed cropping method of galinsoga parviflora with different densities and leafy vegetable kind lettuce under cadmium stress

Abstract

The invention discloses a mixed cropping method of galinsoga parviflora with different densities and leafy vegetable kind lettuce under cadmium stress. A cadmium pollution soil culture potting test method is adopted to manually simulate the field cultivation mode of common vegetables, cadmium hyperaccumulation plant galinsoga parviflora and the leafy vegetable kind lettuce serve as test materials; under the cadmium pollution stress, the galinsoga parviflora planting density is set, and the galinsoga parviflora and the leafy vegetable kind lettuce are subject to mixed cropping; meanwhile, the corresponding density single variety planting serves as the contrast; the growth conditions, cadmium accumulation characteristics, nutrient uptake, lettuce physiology and biochemistry, quality indexes and the change rule of various physicochemical properties of rhizosphere soil of two plants under treatment are analyzed, the regulatory mechanism of the the galinsoga parviflora planting density for accumulation characteristics of the galinsoga parviflora and the lettuce safety production is analyzed. The theoretical reference is provided for safety production of vegetables of the cadmium polluted farmland of the Sichuan area, and the problem that the farmland ecosystem is hard to repair due to the cadmium pollution of the Sichuan area is solved.

Description

Technical field [0001] The invention belongs to the technical field of safe vegetable production, and particularly relates to a mixed cultivation method of hyssop chrysanthemum and leafy lettuce with different densities under cadmium stress. Background technique [0002] In recent years, with the continuous development of the social economy, the unreasonable discharge of industrial "three wastes", the large-scale mining and smelting of mineral resources, the improper disposal of municipal solid waste, and the random application of chemical fertilizers and pesticides have led to increasingly serious soil pollution by heavy metals. Heavy metals are extremely difficult to control and non-degradable pollutants. They can threaten human health through the absorption and accumulation of plants and through the amplification of the food chain, causing a series of food quality and safety issues. In addition, cadmium is one of the most biologically toxic heavy metals. It has strong mobility...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method of mixing different densities of Achyranthes chrysanthemum and leafy lettuce under cadmium stress, aiming to solve the problem that traditional physical and chemical restoration methods are complex in technology, high in investment costs and will destroy the soil ecological environment, and It is easy to cause secondary pollution, which limits the popularization and application of phytoremediation technology, and cannot solve the problem of restoring farmland ecology due to heavy metal cadmium pollution

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