Market players said besides short-covering by operators, pick up in demand at lower levels and tight supplies in spot markets supported the uptick in castor seed futures.
At the National Commodity and Derivative Exchange, castor seed for delivery this month improved by Rs 23 or 0.51 per cent to Rs 4,554 per quintal, with an open interest of 5410 lots.
The most-traded delivery in October month also inched up by Rs 2 or 0.04 per cent to Rs 4,686 per quintal, in an open interest of 87,350 lots.