The Australian Greens will fund 2235 new teachers in disadvantaged government schools as part of a $1 billion scheme to relieve the pressure on teachers and schools and lift Australian educational achievement.

Australian Greens leader Senator Christine Milne said as many as a third of all government schools would get an extra teacher to help reduce teacher workloads, with another $20 million a year for teacher mentoring and professional development.

The 2013 Labor Budget will do little to ease the stress on country South Australians, say Australian Greens Senators Sarah Hanson Young and Penny Wright.

"Labor has spent more time listening to mining companies, the big banks and their factions than the people in rural and regional communities," Senator Hanson-Young said.

"The Greens stood up for regional South Australia during the Murray Darling Basin debate while our colleagues in the old parties and those upstream tried to sell us down the river.