Abstract
Authors investigated on the electrophoretic velocity (u) of the soil colloids of NOBEYAMA (NAGANO) soils and others, and obtained following results. 1) The top soils [NOBEYAMA (NAGANO) NISHITENRYU (NAGANO), FUJISAWA (IWATE)] have a minimum value in pH-u curve, and the sub soils have not. These results are similar to the case of MIKATAGAHARA (Part 1). 2) NOBEYAMA soil and MIKATAGAHARA soil (Part 1) have a same tendency on the curves of soluble aluminium in acidic solutions.
