The invention discloses a method for reducing effective
cadmium content of soil. The method provided by the invention is characterized in that a passivator of meerschaum
powder of 60 meshes is applied to farmland polluted by
cadmium; a utilization amount equation of the passivator of the meerschaum
powder of 60 meshes is determined according to effective
cadmium content of soil; and a utilizationmethod of the passivator of the meerschaum
powder comprises 1, removing
crop straws of the farmland or crushing the
crop straws, 2, uniformly scattering the passivator of the meerschaum powder of 60 meshes on the surface of soil of the farmland by an artificial method or a mechanical method, 3, mechanically turning the soil at least twice for uniform mixing, wherein a soil turning depth is in a range of 15 to 20 centimeters, and in application, it is guaranteed that
wind power is below a level of 2 to 3 or the meerschaum powder do not be blown away, and 4,
sowing crops and then carrying out
irrigation 2 to 3 times under the condition that a normal demand amount of agricultural production water is satisfied, wherein quality of the agricultural production water for the
irrigation satisfies a farmland
irrigation water quality standard and an irrigation method is aopted. The method for reducing effective cadmium content of soil has the advantages of wide application scope, low cost, simple operation, no influence on agricultural production and environmental benefits, can be utilized for
effective treatment on farmland which has a large area of a cadmium-polluted part, can reduce the content of cadmium which can be absorbed by crops, and can prevent penetration of effective cadmium of the soil into agricultural products.