Section 215(1) in The U.P. Zamindari Abolition and Land Reforms Act, 1950
(1)Where any person has been admitted to the occupation of any land or permitted to retain possession of any land as an asami thereof by any person having a right to so admit or permit him, but the rent has not been fixed, the asami or the person so admitting or permitting him may, at any time during the period of occupation or within three years after the expiry of such period, institute a suit for fixation of rent.