The September contract of mustard seed hit a one-month low on NCDEX due to subdued demand from domestic oil millers and crushers. On NCDEX, the most-active October contract was down 0.16% from previous close. Higher carryover stock from 2016-17 season and start of harvesting of kharif oilseeds weigh on market sentiment. Stocking of mustard oil for consumption during Durga Puja has already been procured by traders, which has reduced demand for mustard seed.