At a press conference following the passing of the laws in the House of Representatives this afternoon, several farmers told of the huge economic and social consequences the new legilsation would have on the wheat industry, farmers and rural communities.

More than 80 farmers, predominantly from the southern NSW Riverina district, made the journey to Canberra to meet with Nationals Senator Barnaby Joyce, and witnessed the passing of the laws from the public gallery.

Rankins Springs farmer, Jock Munro, estimated Australia's wheat production would slump and farmers would exit the industry.

"You can stick it Mr Rudd and you can stick it Mr Burke, we're not going to go away," Rankins Springs farmer, Dave Dwyer said.

"We're not going to let you destroy our bloody industry."

Senator Joyce said wheat farmers were "working families" but apparently the wrong kind and thus were not represented by Labor.

"Even if Australians don't quite understand the single desk or the intricacies of wheat marketing, it's important that when decent people feel that they've been ignored...that's not just something against wheat farmers, that's something against our whole parliament and the way we do business here.

"Australian country working families will hold an incredible resentment in their heart about what happened in this building and how they were not represented today.

"This issue's going to go on, and it's going to go on until the next election."

But there are farmers who have welcomed the legislation, with Western Australia's Pastoralists and Graziers Association chairman, Leon Bradley, saying the historic legislative change only came about "following a collapse in the credibility of the previous system".

"The grain growers of WA are looking forward to marketing choice, competition between buyers, and competition in the provision of services," Mr Bradley said.

"PGA Western Graingrowers is anticipating a new era in wheat marketing, and growers are freed from the shackles of monopoly marketing, and innovation and invest flow into the industry.

"The changes will be especially beneficial to the growers of Western and South Australia - now the primary export States – who were being penalised by the deficiencies of compulsory national pooling."

Mr Bradley noted the change was supported by both sides of politics, and thanked Agriculture Minister Tony Burke and Labor Senator Kerry O'Brien, as well as Liberals Wilson Tuckey and Senator Judith Adams for supporting the legislation.