Soybean prices on Monday went up by Rs 72 to Rs 5,984 per quintal in futures market as traders created fresh positions tracking positive spot demand. On the National Commodity and Derivatives Exchange, soybean for October delivery rose by Rs 72, or 1.22 per cent, to Rs 5,984 per quintal with an open interest of 36,015 lots. Marketmen said raising of fresh positions by speculators on the back of higher demand mainly led to rise in soybean prices.