Effects of Silicon on the Yield and Cadmium Accumulation of Rice Grain | Asian Journal of Research i

Pot soil experiments were conducted with two rice cultivars that differed in Cd accumulation, and different Si application levels (low, medium, and high) and different Si application methods (one time and two times) were designed to investigate the effects of silicon (Si) on rice grain yield and cadmium (Cd) concentrations. The Si treatments increased grain yields by 4.81 percent - 11.94 percent in Yangdao 6 (high grain Cd accumulator) and 1.98 percent - 9.94 percent in Yu 44 (low grain Cd accumulator), respectively, as compared to the control. The Si coatings lowered the grain Cd concentrations of Yangdao 6 by 22.22 percent - 73.08 percent, and those of Yu 44 by 28.57 percent - 68.24 percent. Grain yields improved as Si application levels and periods were increased, but grain Cd contents dropped dramatically. Si treatments had a far greater impact on grain Cd concentrations than on grain yields. The results show that by applying Si at a high level and twice during the rice growing period, grain Cd content can be lowered by about 70% and grain yield can be increased by about 10%.

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