The Morrison government has not yet committed to such a target but is laying the groundwork to adopt it as policy, following allies such as the US.
Some members of the Nationals have been less than impressed by the idea, but the junior coalition government partner has an offer - for agriculture to be removed from the emissions reduction target.
Deputy Nationals leader David Littleproud, who is also agriculture minister, says the sector has done the "heavy lifting" in previous emissions reduction agreements.
"They should be rewarded not penalised again," he told the ABC on Monday.
Mr Littleproud's comments support remarks from Nationals leader Michael McCormack.
Nationals backbencher Barnaby Joyce has threatened to cross the floor and vote against the 2050 target if agriculture isn't excluded.
"That is democracy," Mr Littleproud said.
"We represent regional and rural Australia and particularly agriculture sectors right across the country."
Excluding agriculture would put Australia in line with New Zealand's net zero by 2050 plans, which puts a lower threshold on methane.
Agriculture made up 13 per cent of Australia's greenhouse gas emissions last year.
That's expected to rise to 2030 as the effect of the drought eases.
The National Farmers Federation supports net zero emissions by 2050.