Fundamental studies on the ridge-culture of rice plants : (2) Values of pH and Eh of soils

Abstract

This report dealt with values of and Eh of soils in the experimental plots of paddy culture by ridging, vs. by the ordinary method of planting. Values of both pH and Eh were measured with the Chinhydron electrode and the BROWN's methods respectively. The results showed that soils in the ridged plots were disposed to become more acidic and oxidative than those in the ordinary ones. So it was suggested that the reductive state, which is characteristic to normal usbmerged paddy fields, developes scarcely in the ridged fields.