Country's largest lender SBI today raised fixed deposit rates on select maturities by up to 1 per cent, amid tight liquidity situation. Fixed deposits with maturity period of 7 to 90 days will earn eight per cent interest against existing seven per cent. The SBI said in a statement that the new rates would be effective from tomorrow.Interest rate on 91-179 day period fixed deposits has been raised by 0.75 percent while Interest rate for 181-240 day period fixed deposits has been raised by 1 per cent. The rate of interest will be 8 per cent now.Interest rate on 241-day to one-year deposits has been raised by just 0.25 per cent to 8 per cent. SBI becomes the fourth public sector bank to increase fixed deposits rates this month.The bank has left interest rates on fixed deposits beyond one-year maturities unchanged. SBI last revised its fixed deposit rates in August 2011.