"Tractors must have a licence plate since 15th April, 2009 for new vehicles being bought and since 15th October, 2009 for second-hand ones. This follows a change in the regulations that now gives each vehicle a lifetime number. Farm machines in good condition that were bought before the 2009 reform can continue to run with their number until 31st December, 2020.
For more information click on the link:
hereThe decree of 9th February, 2009 concerning the characteristics and the methods of installing the licence plates on the vehicles is available
here.