Prices of mustard seed fell in Jaipur, Rajasthan, due to a rise in arrivals of the oilseed amid subdued demand from domestic oil millers and crushers. In Jaipur, the oilseed was sold down 20-25 rupees. Weak export demand for mustard meal also weighed on prices in the domestic market. On NCDEX, the most-active June contract was down 0.23%.