Further, subdued export demand weighed on castroseed prices at futures trade.
At the National Commodity and Derivatives Exchange, castorseed for delivery in April month contracts dropped sharply by Rs 142, or 3.71 per cent to Rs 3,686 per quintal, with an open interest of 85,880 lots.
Also, most-active March month contracts also plummeted by Rs 137, or 3.64 per cent to Rs 3,627 per quintal, in an open interest of 1,01,720 lots.
Subdued export demand, particularly from China, which imports about 50 per cent of castor oil from India also weighted on prices, they added.