Marketmen said increased supply and slackness in demand from consuming industries such as paint and lubricant mainly pulled down castorseed prices.
Fall in export demand also dampened the trading sentiments to some extent, they added.
At the National Commodity and Derivatives Exchange, castorseed for far June contract dipped by Rs 76, or 1.68 per cent, to Rs 4,442 per quintal with open interest of 330 lots.
Most active near March contract slided by Rs 53, or 1.24 per cent, to Rs 4,214 per quintal in 1,87,990 lots.