You can get more margin to trade mainly from two other sources:
You can avail additional margin through lien of your Fixed Deposits or availing Bank Guarantees. Alternatively, you may also pledge your Mutual Fund units to avail additional margin.
In case under special circumstances, the haircut percentage applicable to you is different, then an additional margin will be provided to you under adhoc margin. In this scenario, adhoc margin will be a positive number. Alternatively, if you initiate a payout under special circumstances outside of the Neo system then your margin will be reduced which will fall under adhoc margin. In this scenario, adhoc margin will be a negative number.