"Instead of a slight easing, farmer confidence found the trap door and jumped right in," he said.
The past few months have seen large falls in commodity prices, with the June 2012 ANZ World Commodity Price Index dropping 12.3 per cent from January.
Wills said the exchange rate had not fallen to the same extent as commodities prices, so that had eaten into farmgate returns.
The European sovereign debt crisis had been extremely negative for sentiment, as had weak growth out of Japan and the United States.
"As the global economy is on the edge, questions remain if China's high rates of growth can be sustained,' Wills said.
While dairy production in the United States would be hit hard by drought, the culling of dairy cows there may increase the supply of beef. In the short term that could soften demand for New Zealand beef, Wills said.
Despite a negative outlook, many farmers still expect to reduce debt, although worsening profit expectations appear to be putting a brake on farmers paying down debt, Wills said.
The survey showed a net 38.7 per cent of respondents expected general economic conditions to worsen over the next 12 months compared with just 4.4 per cent in January.
A net 30.4 per cent of respondents expected to increase production over the next 12 months, down from 47.7 per cent in January.
Federated Farmers economist Nick Clark said farmers had enjoyed the double whammy of high commodities prices and good growing conditions last year. "The thing is commodities prices have fallen back quite sharply in the last six months in particular, and that is now affecting farmgate prices," he said. "The fall of commodities prices and uncertainty as to what the weather might do has caused farmers to be a bit more cautious," Clark said.
There were 900 responses to the Federated Farmers survey, which was backed up by a Ministry for Primary Industries report, which said the March 2012 year was big for producers but earnings had come under pressure.
The ministry said good weather led to a continuation of better-than-usual pasture growth during the quarter.
As a result, farmers achieved near-record carcass weights for slaughtered livestock and an 11.5 per cent increase in milk solids production compared to the same quarter in 2011.
The primary sector continued to be an economic driver, with total primary sector exports accounting for 71 per cent of all merchandise exports in the year to March 2012, the ministry said.
But the stronger New Zealand dollar coupled with easing international dairy prices meant that overall, primary sector export revenue for the quarter was down 2.4 per cent on the previous year, at $8.3 billion, the ministry said.
At the same time, total export revenue for the year to March 2012 was up 6.2 per cent at $32.3 billion.
Total seafood export revenue was up by 9.4 per cent in the March quarter.
Forest product export revenue declined 14 per cent, largely due to significant declines in log and pulp exports. However it was still the sector's second-best quarter on record, the ministry said.