SA declare early v NSW after Lehmann hits Shield ton

Jake Lehmann was 101no as SA declared on 7-309 on day three against NSW in the Sheffield Shield. (Matt Turner/AAP PHOTOS) (AAP)

A daring declaration from South Australia captain Jake Lehmann has set up the possibility of a result in the Sheffield Shield match against NSW in Adelaide.

South Australia declared late during the middle session on day three at 7d-309 as the home side conceded a 138-run deficit in the final-round fixture.