Blocking agent for reducing content of heavy metal of edible part of crops and application method thereof

Abstract

The invention discloses a blocking agent for reducing the content of heavy metal of edible parts of crops and an application method thereof. The blocking agent comprises glycerol or one or two of glycerol, oxaloacetic acid and alpha-oxoglutarate, and can realize the purposes of blocking absorption of heavy metal and transferring to edible parts through foliage spraying after vegetable farming andbefore harvesting. The blocking agent can obviously reduce the contents of heavy metal, such as plumbum and cadmium, at the edible parts of vegetables, so as to ensure that vegetables produced in mildor medium-heavy metal contaminated vegetable fields meet food safety standards. The blocking agent is low in effective spraying concentration, can be mixed with pesticide for controlling vegetable diseases and insect pests and then be sprayed, and is low in cost.

Description

[0001] This application belongs to the divisional application with the parent application number 201610234494.9. technical field [0002] The invention belongs to the field of prevention and control of heavy metal polluted farmland, and in particular relates to a barrier agent for reducing the content of heavy metals in edible parts of crops and a method for using the same. Background technique [0003] The area of ​​cultivated land polluted by heavy metals in my country is nearly 20 million hectares, accounting for about 1 / 5 of the total cultivated land area, resulting in an annual reduction of more than 10 million tons of grain, more than 12 million tons of contaminated grain, and a total economic loss of at least 20 billion yuan. Soil heavy metal pollution has become a major obstacle to my country's sustainable development. Vegetables are one of the necessary foods in people's daily life, and the quality and safety of vegetable baskets have received widespread attention in...

AI Technical Summary

Problems solved by technology

To achieve the purpose of effectively passivating soil heavy metals, the amount of passivating agent is generally large, which has a great impact on the soil structure and physical and chemical properties, often leading to a decrease in the yield of cultivated land, and the farmers' income will be greatly affected

In addition, there are phytoremediation methods (CN102500614A, CN101941018B, CN102172608B, CN102172611B, CN104858226A, CN103109651A), but for China where cultivated land resources are scarce, the necessary conditions for large-scale promotion and application are not yet available

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