The 6-month yield increased 09 basis points to 12.86 percent and the 6-month yield rose 11 basis points to 12.99 percent.
The debt office which is a unit of the Central Bank said 23.4 billion rupees of bids were accepted from the market after offering 18 billion rupees for rollover.
Rising Treasuries rates can help prevent a widening budget deficit from de-stabilizing the economy with high inflation and currency depreciation.
Sri Lanka's rupee came under severe pressure up to the first quarter of 2012 as the Central Bank bought Treasury bills to inject money into the banking system.
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