The effect of magnesium oxide material on cadmium uptake by wheat (Ayahikari and Norin No. 61) was
investigated in the upland field (Fluvaquept) rotated from paddy rice field of Tokyo, Central Japan. Soil pH
was relatively high due to long history of paddy rice cultivation. Magnesium oxide material (also containing
antigorite + vermiculite) was used for neutralization to achieve the suppression of cadmium uptake by wheat,
associated with improvement of the imbalance of calcium and magnesium with calcium carbonate for a long
time. However, the application of magnesium oxide material at the level of 3000 kg/ha, which maintained
soil at pH less than 6.5, did not significantly suppress cadmium uptake by two different wheat cultivars. It is
suggested more suitable methods are required to suppress cadmium uptake by wheat than the application of
magnesium oxide material in the case of this upland field rotated from paddy rice field which showed neutral
soil pH.