What are the margin requirements if my position is hedged? Eg:Buying March Futures & shorting April Futures

Hedge: Minimizing the risk.

Example: Long on March future and short on April future, or Buying call and put option.

Whenever you hedge your position or taking a fresh hedge position, you get margin benefit that is cash margin requirement for taking position will be less than the actual margin required.

In case of completely hedge position you should maintain margin required for the position which requires more amount. And for partial hedge position you should maintain margin based on the SPAN calculation.

Generally you get this information with the broker whom you are trading, brokers provide this information either on their trading platform or there website you can visit them.

Just like to correct - margin benefits will be given for writing option, not for buying.