We investigated the effect of potassium silicate application on soil exchangeable and non-exchangeable potassium supply capacity and how the application contributes to the suppression of radioactive cesium absorption by plants in decontaminated grasslands during simple renovation. The application of potassium silicate increased the non-exchangeable potassium content in soils, and the effect continued until early spring in the second year after the renovation. Potassium silicate application resulted in soil potassium retention and might contribute to the sustainability of potassium supply ability from soils. Issues remain regarding the relationship with radioactive cesium and potassium silicate.
