Tds deduction on agriculture money of deceased person.

Greeting of the day.

I have some Fixed deposite in bank money comes from the sales of aggriculture land on my father name. My father is expired now and while transfering the FD to nominee name bank is deducting the 20% of interest earned from those FD's. My faher was not having the PAN card when he was alive. Can Nominee apply the PAN card on my father behalf and file the ITR on his behalf can save the TDS amount. Please suggest the possible procedure to save that TDS amount while will not be deducted if he was alive or only 10% if he was having the PAN card before.

Thanks in advance