Wills said the biggest challenges facing farmers today were environmental, and mostly to do with water quality - particularly in the areas with intensive dairy farming.
He said the need to clean up New Zealand's polluted waterways had met with more acceptance from farmers than it did 12 months ago.
Farmers had also faced up to the reality of volatile exchange rates, he said.
"Increasingly, farmers are coming around to the point of view that there is no point in jumping up and down about things that we cannot control.
"Obviously the strong New Zealand dollar is a concern but our big hope is that if we see a big fall-off in commodities prices, then normally the currency comes off as well, which will provide a buffer."
Farming, fishing and forestry accounted for 69 per cent of New Zealand's exports last year.
"We are good at producing high-quality food, and we have a reputation for it, so we are in a very good place in the world as it stands today, so farmers are optimistic," Wills said.
Finance Minister Bill English - who addressed yesterday's session - said the primary sector was far from being a "sunset" industry.
Farmers should focus on helping grow a more competitive economy, rather than spending too much time worrying about the gloomy state of overseas economies, English said.
Europe would remain a dark cloud on the horizon for the world economy but he said farmers needed to focus on what could be influenced at home: "We've got to be careful we don't let that problem paralyse us and certainly that we don't wait for Europe to get fixed because it won't."