At the NCDEX, most traded contract of June edged down by Rs 28, or 0.77%, to Rs 3,620 per quintal, with a business turnover of 66,220 open lots. Subdued trend in spot markets, where prices declined on sustained supplies from growing regions amid feeble demand from oil mills mainly discouraged the traders, which caused the downfall in prices in futures trading. Mustard seed for August delivery weakened by Rs 39, or 1.04% to Rs 3,721 per quintal, clocking an open interest of 3,670 lots.