A new study by the Japan Agricultural and Food Industry Technology Comprehensive Research Institute shows that the application of exchangeable potassium fertilizer to rice fields contaminated with radioactive cesium can reduce the radioactive cesium absorbed by brown rice by at least half.
Exchangeable potassium is the form of potassium that the crop directly absorbs, but the amount of exchangeable potassium in the soil is quite limited.
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However, the researchers found that the more exchangeable potassium application, the more effective it is. In soils with very high exchangeable potassium content, the application of exchangeable potassium fertilizer will hardly be effective.
According to Kato Naoto, chief researcher at the agency, "This method is effective in soils with low exchangeable potassium levels. If brown rice is further processed into polished rice, the concentration of radioactive cesium will be further reduced. I hope this year will be used in some areas of Japan. This method."
In the future, the research team is also preparing to investigate annually whether the effect of this method will change and the effect on other crops.
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