Sir, where i find fair market value of a land as on 1st April 2001

check  out  on  web site  Income Tax . gov.in  you  will  get  indexation  chart   and fair market value  on 2001  you have  find out  form  Registered  Valuer  Certified  by the GOVT . 

You have  to find out  value  in  2001  from  Registered  Valuer  certified  by the GOVT . 

Which city do you reside in. I mean in which city is the property situated?

You can search on IGRS.UP.GOV.IN or you can visit the regional registry office, there they have the year wise list of the same

If you PURCHASED IT then your applicable cost will be your actual purchase price of 2006. Then no role of DLC on 1st April 2001 for Capital Calculation

But if you have got this in gift from someone who purchased it before 1 April 2001 or if it it ancestral property , then in both these cases you will have to take DLC of 1 April 20001 as your cost.

The base year has an index value of 100. Years after the base year are indexed to measure inflation. For assets bought before the base year, their purchase price can be taken as either their Fair Market Value (FMV) or actual cost on the base year's first day. Indexation benefits are then applied to this price for tax purposes. FMV is determined by a registered valuer's report.

Formula

Indexed Cost of Asset Acquisition = (CII for sale year x Cost of acquisition) / (CII for the year of asset purchase or 2001-02, whichever is later)

Indexed Cost of Asset Improvement = (CII for sale year x Cost of improvement) / CII for year of improvement