At the National Commodity and Derivatives Exchange, castorseed for delivery in October plummeted by Rs 122, or 2.98 per cent to Rs 3,974 per quintal, with an open interest of 14,120 lots.
Castorseed for delivery in September was also trading lower by Rs 108, or 2.68 per cent to Rs 3,921 per quintal, having an open interest of 1,38,720 lots.
Marketmen said offloading of positions by participants to book profits amidst rising inventories led to the fall in castorseed prices.