AUSSIE and Kiwi farmers are joining forces in a bid to liberalise global agricultural trade.

Their peak farming bodies are calling for a comprehensive and liberalising Trans Pacific Partnership agreement.

They say market liberalisation would help smaller agri-businesses from the two farming nations access growing global markets.

Federated Farmers of New Zealand and the National Farmers' Federation are both participating in the TPP negotiations in Auckland.

Federated Farmers of New Zealand president Bruce Wills said "liberalisation must result in the elimination of all agricultural and food product tariffs and reform non-tariff measures".

NFF president Jock Laurie said market access for agriculture needed to be at the core of the negotiations.