Marketmen said increased supply and slackness in demand in physical markets mainly led to the fall in futures prices of castorseed.
Easing export on falling demand in overseas markets also influenced the market sentiment, they said.
At the National Commodity and Derivatives Exchange, castorseed prices for July contract drifted Rs 81, or 1.76 per cent, to Rs 4,522 per quintal, in an open interest of 4,600 lots.
March contract dipped by Rs 59, or 1.38 per cent, to Rs 4,217 per quintal, with an open interest of 32,720 lots.