Soybean futures for June contract lost Rs 73, or 1.90% to Rs 3,764 per quintal in 82,590 lots.
At the National Commodity and Derivative Exchange (NCDEX), the May contract also looked down by Rs 69.50, or 1.77%, to Rs 3,862.50 per quintal in 36,550 lots.
Prices slumped on all-round selling by traders.
Weakening international markets mainly put pressure here on futures prices.