Marketrmen said all round selling by traders on existing higher levels mainly led the sharp fall in prices.
Slackness in overseas demand also helped to pull down the prices, they added.
At the National Commodity and Derivatives Exchange counter, castorseed prices for most far May contract dropped by Rs 191, or 3.98 per cent, to Rs 4,606 per quintal, with an open interest of 3,200 lots.
Most active near February contract dipped by Rs 165, or 3.63 per cent, at Rs 4,375 per quintal, having an open interest of 1,75,650 lots.