The interbank call money rates ended lower at 6.50 per cent from the previous close of 7.10 per cent. The call money market moved in the 6.35-7.5 per cent range. The benchmark 7.16 per cent government security, which matures in 2023, closed sharply weaker at Rs 93.22 from the previous close of Rs 93.78. Yields hardened for the second consecutive day to 8.17 per cent from 8.08 per cent.