Marketmen said increased arrivals and reduced offtake by oil mills in physical markets mainly put pressure on traders to minimise holdings.
At the National Commodity and Derivatives Exchange, mustardseed prices for April contract declined by Rs 51, or 1.43 per cent, to Rs 3,511 per quintal, with an open interest of 62,800 lots.
May contracts slipped by the same margins of Rs 51, or 1.42 per cent, to Rs 3,548 per quintal, having an open interest of 72,930 lots.