Marketmen said trimming of positions by participants, tracking a weak trend in global market, mainly led to drop in futures trading.
At the National Commodity and Derivatives Exchange, soybean for delivery this month dipped Rs 39, or 1.21 per cent, to Rs 3,186 per quintal, with an open interest of 19,680 lots.
Also, soybean for delivery in most-active November slipped by Rs 38, or 1.18 per cent, to Rs 3,183 per quintal, in an open interest of 1,13,060 lots.