The effects of intermitting flooding in latter growth stage to cadmium content in brown rice [Oryza sativa]
2006
Inahara, M.(Toyama-ken. Agricultural Research Center (Japan)) | Yamada, M. | Azuma, H.
This study was conducted to evaluate the effects of intermitting treatment of flooding management to restrain Cadmium (Cd) uptake by lowland rice in latter growth stage to cadmium content in brown rice. Lowland rice (Oryza sativa L. cv. Koshihikari) was cultured in pots with the topsoil of paddy field slightly polluted with Cd in Jinzu River basin. Intermitting treatments were carried out for about 8 days at different time in flooding period for 40 days. Culm length in maturing stage was shortened and percentage sterility was increased by intermitting treatment from 4th day before heading to 4th day after heading. Cd content in brown rice was increased by intermitting treatments without regard to the time of intermitting. And it was remarkably increased by intermitting in ripening period from 4th day to 20th day after heading. About this result it was also considered as the factor that the fall of soil Eh was dilatory under low temperature in the flooding period after intermitting treatment so this result could not be judged as the risk peculiar to active ripening period. By the above there was the risk that Cd content in brown rice was increased by intermitting treatment of flooding management over the flooding period for 40 days, and it was considered that flooding management should be continued over 40 days without intermitting to decrease Cd content in brown rice.
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