Selenium application method for reducing mercury content of rice grains in rice field with severe mercury contamination

A technology of rice grain and mercury pollution, applied in fertilization methods, fertilization devices, applications, etc., can solve problems such as lack of research, and achieve the effect of eliminating the threat to human health

Inactive Publication Date: 2017-05-10
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lack of research on the effect of selenium fertilizer application level and application period on rice grain mercury content

Method used

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  • Selenium application method for reducing mercury content of rice grains in rice field with severe mercury contamination
  • Selenium application method for reducing mercury content of rice grains in rice field with severe mercury contamination

Examples

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Embodiment 1

[0010] Example 1: A selenium application method for reducing the mercury content of rice grains in heavily mercury-polluted paddy fields. In the entire rice production cycle, the total amount of selenium application is 120g / hm 2 (High amount of selenium application), divided into three applications, respectively applying 1 / 2 of the total selenium amount 20 days after planting seedlings, and applying 1 / 4 of the total selenium amount 5 days before heading and 10 days after heading. Since the Se content of different selenium fertilizer varieties is different, the specific fertilization amount should be calculated according to the Se content of the specific selenium fertilizer species when applying selenium.

[0011] The selenium fertilization method adopts the foliar spraying method, and the water-soluble selenium fertilizer is dissolved in water and sprayed, and the water consumption per hectare is 300L.

[0012] The following table further proves that this example can greatly r...

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Abstract

The invention relates to a selenium application method for reducing mercury content of rice grains in a rice field with severe mercury contamination and belongs to the technical field of controlling heavy metal contamination in agricultural products. The method is characterized by applying selenium three times under total application amount of 120 g / hm<2> (high application amount) to a rice field with severe mercury contamination (having soil Hg concentration of 2 mg / kg, four times the national limit standard), to be specific, applying 1 / 2 of total selenium 20 days after rice transplanting, applying 1 / 4 of the total selenium 5 days before heading, and applying 1 / 4 of the total selenium 10 days after heading. Compared with common selenium-free application in actual rice production, the method provides a great decrease in the mercury content of rice grains (71.05% for Indica rice, and 72.41% for Japonica rice).

Description

technical field [0001] The invention relates to a selenium application method for reducing the mercury content of rice grains in heavily mercury-polluted paddy fields, which belongs to the prevention and control technology of heavy metal pollution of agricultural products. Background technique [0002] In China's industrial areas and economically developed areas, with the increase of population, the development of industry and the extensive use of agricultural chemicals, the heavy metal pollution of farmland soil is becoming more and more serious. According to the survey, the area of ​​agricultural land polluted by heavy metals in the country is about 25 million hectares, and the amount of food polluted by heavy metals is as high as 12 million tons every year. The environmental protection monitoring system of the Ministry of Agriculture surveyed 82.23 million mu of land in 320 seriously polluted areas in 24 provinces and cities across the country and found that the area of ​...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01C21/00
CPCA01C21/005
Inventor 刘建国王国宇王明新
Owner CHANGZHOU UNIV
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