India's central bank is likely to boost liquidity ahead of the fiscal year end, economists said, as it seeks to restrain short-term rates from spiking and offset the impact of its currency-market interventions that sought to arrest the rupee's precipitous slide since the start of the Iran war. The Reserve Bank of India's (RBI) liquidity-enhancing arsenal includes open market operations (OMOs) for bond purchases, or dollar-rupee buy-sell swaps, bankers and economists said.