Cadmium-reducing compound fertilizer and its application method

Abstract

The application relates to a cadmium-reducing compound fertilizer and its application method. The cadmium-reducing compound fertilizer includes deep fertilization and surface fertilization. The electrical properties of the silty surface activated by chloride ions turn from negative to positive; negative colloidal fertilizers are used to generate negative colloids to combine the passivated hydroxides and oxides of heavy metals containing cadmium to form iron-manganese nodules and then settle to the lower soil layer . This application proposes a core concept of cadmium reduction technology, which is to make cadmium incompatible with the soil, so that the soil cultivation layer changes from an enrichment layer to an anti-enrichment layer, so that cadmium can be automatically separated from the soil cultivation layer. The water infiltrates into the core soil, thereby solving the problem of cadmium pollution in the soil, realizing the reduction of cadmium with fertilizer, without increasing the cost of fertilization, fundamentally solving the problem of cadmium reduction up to the standard, and achieving the goal of treating both symptoms and root causes, with low cost and reduced cost. The advantages of stable cadmium technology, and the production can be maintained during the cadmium reduction process, which is easy to promote.

Description

technical field [0001] The application relates to the field of reducing cadmium, in particular to a compound fertilizer for reducing cadmium and its application method. Background technique [0002] The inventors have found that the enrichment of soil cadmium in the cultivated layer is related to the cadmium interception of water and air flowing through the cultivated layer in the front-line work of farmland with more than 30 years of experience. Usually, the cadmium concentration in the water flowing into the paddy field is lower than 0.005 mg / L. If the soil does not have a cadmium enrichment mechanism, even if the cadmium in the irrigation water source exceeds the standard by 50 times, the soil cadmium content will not exceed the standard. Therefore, the excess of cadmium in the soil is firstly determined by the ability of the soil to absorb and hold cadmium. That is to say, the soil chemical mechanism of cadmium enrichment is formed first, and then the pollutants exceed ...

AI Technical Summary

Problems solved by technology

After the 1980s, due to the application of a large amount of chemical fertilizers containing chloride ions to the soil, the soil that was originally anti-enriched for cadmium became positively enriched, and the tendency of cadmium enrichment was reversed, which led to the problem of excessive cadmium in crops

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