Abstract
This study aims to clarify the removal of four soluble element concentrations (iron, manganese, calcium, potassium) in the soil solution at 20 cm using an open lysimeter at paddy fields. As a result of this study, the removal of iron and manganese elements were found to correspond to the redox potential in the plow layer. The concentration of calcium element was affected by that of iron. When the concentration of iron was high, the concentration of calcium element also became high. Potassium element concentrations were influenced by fertilization and that influence continued about 60 days after fertilization. These variations of those four element concentrations were found in the plow layer of 20 cm depth during the same stage of rice growth.
