The National Film Awards were established in 1954 to " encourage production of the films of a high aesthetic and technical standard and educational and culture value " and also planned to included awards for regional films . In 1989 , at the 37th National Film Awards the new category of award for Best Film on Environment Conservation/Preservation was introduced for the Rajat Kamal and awarded annually for films produced in the year across the country , in all Indian languages . since its inception , the award has been present only nineteen times to unique films . It has been presented for films in eight languages with the highest being six in Malayalam , followed by five in Kannada , two each in Assamese and Odia , and one each in Bodo , Manipuri , Marathi , and Tamil . It was not presented on nine occasion in 1990 ( 38th ceremony ) , 1991 ( 39th ceremony ) , 1996 ( 44th ceremony ) , 2001 ( 49th ceremony ) , 2002 ( 50th ceremony ) , 2006 ( 54th ceremony ) , 2007 ( 55th ceremony ) , 2009 ( 57th ceremony ) , and 2011 ( 59th ceremony )
1990 ( 38th ceremony )
38th National Film Awards
National Film Award for Best Film on Environment Conservation/Preservation