Method for reducing arsenic absorbed by crops

Abstract

The invention discloses a method for reducing arsenic absorbed by crops. The method comprises the following steps: an aperture disk which is 50-55cm long and 25-30cm wide is selected to serve as a seedling-raising disk, the seedling-raising disk comprises 28-34 apertures, and each aperture has a diameter of 5-7cm and is 9-10cm deep; 60%-65% of grass charcoal, 25-30% of vermiculite, 5-7% of magnesia-alumina bimetallic oxide and 3-5% of ferrihydrite are mixed in percentage by weight; 1-2kog of nitrgen, phosphorus and potassium ternary compound fertilizers are added into 100kg of mixtures and are uniformly mixed to form seedling substrates; 35-40% of water is sprayed onto the seedling substrates in percentage by weight, and then the seedling substrates are aired for 2-3 days in shades; the seedling substrates are put into the selected aperture disk, and the seedling substrates in each aperture are leveled; seeds sown in each aperture are covered with a few seedling substrates, and then water is sprayed until the water seeps out of small holes in the bottoms of the apertures. After the method is used in farmland with excessive arsenic, the arsenic accumulated in the crops can be obviously reduced.

Description

technical field [0001] The invention relates to a treatment method for farmland soil polluted by heavy metal arsenic, in particular to a method for reducing arsenic absorption by crops. Background technique [0002] Arsenic is a carcinogenic metalloid element that widely exists in nature, and its harm to human health is even more serious than cadmium. my country is a large country of arsenic mines, and it is also one of the countries in the world that suffers more and more serious arsenic pollution incidents. In recent years, arsenic pollution incidents have occurred frequently in some areas of my country, such as the arsenic pollution incident in Yangzonghai, Yunnan in 2008. Experts believe that the treatment of arsenic may take a long time, and it is more difficult to cure it. As far as farmland soil is concerned, due to the mining around the farmland and the use of arsenic-containing pesticides and insecticides, as well as the arsenic-containing sewage or groundwater en...

AI Technical Summary

Problems solved by technology

However, due to the differences in the cultivation of low-absorbing crops in different areas where arsenic exceeds the standard, farmers are difficult to identify, and crop varieties (especially vegetables) are frequently changed, etc., all of which obviously limit the large-scale promotion and application of this technology

In addition, through interplanting with arsenic hyperaccumulator plants, the effect of reducing the absorption and accumulation of arsenic in crops is unstable, and the yield and quality of agricultural products cannot be guaranteed.

Furthermore, the cost of implementing these measures is too high, and the labor intensity is relatively high, which is not conducive to the sustainable development of agriculture in our country.

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