They say the move was made on health and safety grounds.
The National Ploughing Association has defended cashless ticketing for this year's championships.
It says it has made the move solely on health and safety grounds in order to get an accurate headcount.
The National Ploughing Championships take place in Ratheniska from September 19th.
Anna Marie McHugh from the NPA says no alternatives have been put forward, so cashless ticketing it is:
The Irish Rural Association disagrees with ticketing for this year's event being cashless.
Spokesperson Jackie Flannery says cash is legal tender, and therefore should be accepted:
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