A safe production method of cadmium contaminated paddy field by applying green manure and clay minerals

By combining green manure with clay minerals, cadmium-contaminated paddy fields were synergistically restored, solving the problems of rice safety and soil degradation in cadmium-contaminated paddy fields, and achieving the effects of reducing fertilizer use and improving soil.

CN122228892APending Publication Date: 2026-06-19SHAANXI UNIV OF SCI & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Filing Date
2026-03-18
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing technologies, the ability of returning green manure alone to the field to passivate heavy metals is limited, while the application of bentonite alone is insufficient in terms of soil fertilization and nitrogen nutrient supply, leading to problems with the safety of rice from cadmium-contaminated paddy fields and soil degradation.

Method used

The method of applying green manure and clay minerals (such as calcium-based bentonite) in combination can synergistically repair the soil, reduce the effective cadmium content in the soil, and prevent its transfer to rice by applying green manure and clay minerals to paddy fields and using nitrogen fertilizer in a reasonable manner.

Benefits of technology

It significantly improves soil physical and chemical properties, reduces the risk of cadmium pollution, reduces fertilizer use, maintains or increases rice yield, achieves safe rice production, and is easy to promote and apply.

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Abstract

This invention provides a method for safe production in cadmium-contaminated paddy fields using a combination of green manure and clay minerals, comprising the following steps: (1) applying green manure to the paddy field; (2) applying clay minerals and base fertilizer to the paddy field; and (3) transplanting rice seedlings in the paddy field and applying nitrogen fertilizer during the rice tillering stage. Preferably, in step (1), the green manure is leguminous green manure. This invention combines green manure with clay minerals. The organic matter produced by the decomposition of green manure may enhance the fixation stability of cadmium by clay minerals, while the improved soil environment by clay minerals may promote the effectiveness of green manure nutrients and root utilization. This synergistic effect makes it possible to reduce chemical nitrogen fertilizer use by 20% to 50% in rice cultivation, while simultaneously ensuring a steady increase in rice yield by improving fertilizer utilization and promoting root development, and effectively reducing cadmium pollution. Ultimately, it achieves multiple goals simultaneously: safe production in cadmium-contaminated paddy fields, reduction of chemical fertilizer use, and improvement of soil fertility.
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