the loss of not less than 20 hectares of grades 1, 2 or 3a agricultural land which is for the time being used (or was last used) for agricultural purposes; or
colli dim llai nag 20 hectar o dir amaethyddol graddau 1, 2 neu 3a a ddefnyddir ar y pryd (neu a ddefnyddiwyd ddiwethaf) at ddibenion amaethyddol; neu