Method for performing in-situ activation on greenhouse soil heavy metal through coordination of corn stalks and decomposed coal

Abstract

The invention discloses a method for performing in-situ activation on greenhouse soil heavy metal through coordination of corn stalks and decomposed coal. The corn stalks are dried in air and smashed so that stalk raw materials can be obtained. The stalk raw materials are flatly laid at the position 20-30 cm away from the surface layer of greenhouse soil according to the using amount of 1800-2500 kg/hm<2>, and the surface layer greenhouse soil with the thickness being 20-30 cm is excavated; a bacterium solution of EM and distilled water are diluted according to the volume ratio of 1:100-1:200, and the diluted bacterium solution of the EM is evenly sprayed to the surfaces of the stalk raw materials according to the using amount of 280-350 L/hm<2>; the excavated surface layer greenhouse soil with the thickness being 20-30 cm and the decomposed coal are evenly mixed, the using amount of the decomposed coal is 720-780 kg/hm<2>, and the flatly-laid stalk raw materials are covered with the mixed greenhouse soil. The method has the beneficial effects of being easy to operate and low in cost. The content of available heavy metal in the greenhouse soil can be effectively reduced.

Description

Technical field [0001] The invention belongs to the field of agricultural production, and in particular relates to a method for using corn stalks to efficiently return to the field in cooperation with weathered coal to passivate heavy metals in the soil of the facility in situ. Background technique [0002] As one of the most important agricultural production methods in the world, facility soils account for an increasing proportion of my country’s agricultural production. There are large amounts of agricultural chemicals and organic fertilizers, high multiple cropping rates, and high farming intensity, which have led to a series of restrictions. The soil degradation problems of facility agriculture, such as secondary salinization, deterioration of biological properties and continuous cropping obstacles, heavy metal pollution and excessive residues of harmful substances, etc. Among them, the accumulation of heavy metals and even pollution problems not only limit the healthy develop...

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Problems solved by technology

[0008] The above-mentioned existing technologies are all modified straws to prepare adsorption materials. However, their common problems are that they need to go through the modification process, and there are many limiting factors in application. At the same time, they are mainly used in the adsorption of heavy metal pollution in water.

[0009] The inventor also retrieved the patent of publication number CN104263374A "A Soil Heavy Metal Composite Stabilizer and Its Application Method", which discloses a soil heavy metal composite stabilizer comprising organic matter, phosphate fertilizer and nitrogen fertilizer. The mass ratio is 1:5-8 and the invention is mixed evenly for 15 days, but the organic matter used in this invention is natural decomposed cow dung or fungus residue, and does not use corn stalks, which are more widely obtained

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