The Nationals have won a reprieve for Australian wheat growers' greatest asset in the subsidy-corrupted world wheat market – the export single desk.

However, Queensland Nationals Senator Barnaby Joyce warned that if support from the wheat industry was not loud and immediate, anti-single desk forces would rally to destroy it in the face of ambivalence.

"I know there is a drought and I know finances are tight but all farmers and friends of the Australian single desk have to rally together now.

"The reality of the Senate is that, with the Greens and the Democrats support, there are the numbers to get around the Nationals' support for the single desk.

"Thanks to the Nationals’ strong stand, the US and EU will have to put the cork back in the celebratory Champaign for now.

"If the support from the industry is not loud and immediate though the forces that have rallied against the single desk will read ambivalence as agreement to deregulation of the single desk.

"I'm far happier with the Minister having control than what the alternative was, which was we were about to lose the single desk, complete deregulation," Senator Joyce said.

"The National Party had to step up to the mark and get to a position where we maintained the single desk and we maintained it in such a way to give time to the growers to mobilise.

"That is the most emphatic message out of this - you have a period of time where the growers must mobilise and in the next six months they must come forward and absolutely bang their pots and get on their tractors and tell the whole world, especially those living in Canberra, that they do not want to lose the single desk."