"az0" . "Field margins area and configuration unchanged for 3 years or more" . . "Catch crops field with no change in area and configuration for 3 years or more" . . "A field of nitrogen-accumulating plants whose area and configuration have not changed for 3 years or more" . "Catch crops field with no change in area and configuration for 3 years or more" . "A field of nitrogen-accumulating plants whose area and configuration have not changed for 3 years or more" . "Field margins area and configuration unchanged for 3 years or more" .