Futures contracts of coriander may open lower on the NCDEX as the exchange will levy a 5% additional margin and 10% special margin on the contracts. The additional margin has been imposed on both buy and sell positions, while the special margin has been levied on sell positions on all running and yet-to-be-launched contracts of coriander. June contract of coriander on NCDEX ended at 5,345 rupees per 100 kg, up 3.7% from the previous close.