The Ulster Farmers Union (UFU) warned that any drastic changes in financing and supporting Northern Ireland's agriculture would have a “significant” and “detrimental” effect on northern Irish farms.
The Union said that while Britain left the EU, funding should be maintained at least at the current level.
A significant share of farm income in Northern Ireland comes from direct EU payments, which actually act as affordable food subsidies for consumers.
The Ulster Farmers Union said that the types of trade deals Great Britain made after Brexit will determine what level of support is needed.
President of the Ulster Farmers Union Ivor Ferguson said: “The government should give as much time as possible to move to a new policy, farmers will need time to adapt their business. In addition, policy flexibility for various regions of the UK is key.
Farming in southern England is distinct from farming on the northern coast of Northern Ireland. Our local policies must be appropriate to our needs. ”