Banks offered RON1.16 billion, but the ministry rejected all yields above 2.98% a year, central bank data showed.
At the previous similar auction July 15, the ministry sold RON300 million of treasury bills at an annual yield of 4.24%.
The ministry plans to sell state treasuries worth RON4.75 billion in October, from RON3.82 billion in the previous month.
So far in 2013, Romania sold RON39.06 billion in leu-denominated notes and EUR1.57 billion at four euro-denominated auctions on the local market. The ministry also tapped international markets for $1.5 billion at a US dollar-bond auction in February and raised another EUR1.5 billion at a Eurobond sale in September. (EUR1=RON4.4478)