Soybean prices on Tuesday fell by Rs 7 to Rs 5,952 per quintal in futures market as participants cut down their positions on weak spot demand. On the National Commodity and Derivatives Exchange, soybean contracts for October delivery fell Rs 7, or 0.12 per cent, to Rs 5,952 per quintal with an open interest of 35,485 lots. The fall in soybean prices in futures trade was mostly due to reduction of exposure by participants, marketmen said.