The margin is a minimum percentage of the order value that traders are required to deposit with the exchange to trade in the commodity futures.
Currently, there is 20 per cent margin on chana buyers and 5 per cent on sellers.
"A special margin of 25 per cent (in cash) on the Long side (buyers) and 5 per cent (in cash) on short side (sellers) has been imposed on all running contracts and yet to be launched contracts in chana with effect from April 22," NCDEX said in a statement.
As per exchange data, chana futures prices for the July contract have risen by almost 15 per cent to Rs 5,539 per quintal in the last 20 days due to tight supply concerns.
Gram production is estimated to be 8.09 million tonnes in 2015-16 crop year (July-June), slightly better than 7.17 million tonnes in the previous year, but much below the record 9.53 million tonnes in 2013-14.