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The effect of silicon (Si) on sheath blight (Rhizoctonia solani Kuhn) of rice was studied under greenhouse conditions. The predominant commercial rice cultivars 'BR-IRGA 409', 'Metica-1', 'EPAGRI-109', 'Rio Formoso', 'Javae', and 'CICA-8', were grown in pots containing low-Si soil amended with 0, 0.48, 0.96, 1.44 or 1.92g Si pot -1 . Plants were inoculated at the maximum tillering stage...