The confidence of the country's farmers is slightly up on last year but remains weak.

The latest Farm Confidence Survey shows that around 70% of respondents expect their profitability to stay the same or improve over the next year.

However, Federated Farmers president William Rolleston says many farmers have concerns about the global market post Brexit, and its impact locally.

He says it's unsurprising almost 40% of respondents identified farm-gate prices as their biggest single concern.

Other areas of concern highlighted included regulation and compliance costs, health and safety requirements and resource management issues.