Marketmen said profit-booking by speculators amid a weakening spot market trend mainly influenced the sentiment.
At the National Commodity and Derivatives Exchange, castorseed prices for June contract dipped by Rs 66, or 1.49 per cent, to Rs 4,360 per quintal, with an open interest of 9,310 lots.
Most active March contract fell by Rs 46, or 1.10 per cent, to Rs 4,213 per quintal, having an open interest of 1,33,440 lots.