Recently, the fertilizer and fertilization technology innovation team of the Institute of Agricultural Resources and Regional Planning of the Chinese Academy of Agricultural Sciences found that green manure mixed sowing can strengthen the control of cadmium absorption in rice by increasing the iron film content on the root surface of rice and promoting the modification of soil dissolved organic matter. The findings were published in Environmental Research.
The planting and utilization of green manure is not only an important measure to improve rice yield and soil fertility in paddy fields in southern China, but also an effective means to control cadmium pollution in rice fields in situ and realize the safe use of cadmium contaminated soil. Green manure co-seeding of different families is a common technology to enhance the green manure effect in paddy fields, and it is not clear whether the control effect of cadmium after green manure co-sowing is better than that of single sowing.
The results showed that compared with winter fallow, the cadmium content of different parts of rice was significantly reduced by single sowing and mixed sowing treatments. Among them, the cadmium content in rice grains was significantly reduced by 76.6%-97.0%, and compared with single-seeded milk vetch or rapeseed, mixed seeding of milk vetch-rape-ryegrass had a better effect on reducing cadmium content in rice. By increasing the content of iron film on the surface of rice roots and increasing the content of humus-like substances in soil dissolved organic matter, the cadmium absorption of rice was controlled, and the mixed sowing effect of green manure was better. The research results provide technical and theoretical support for the safe production of rice by using green manure in cadmium-polluted paddy fields in southern China.
The research was supported by the 14th Five-Year Plan National Key R&D Program and other projects.
Original link:
https://doi.org/10.1016/j.envres.2024.118719
- Source: Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences
- Editor: Sheng Ran
- Typesetting: Xiaotong