The axing of Land and Water Australia (LWA) seriously undermines agricultural and natural resource management in Australia and will be opposed by the Australian Greens.

"Senate Estimates reveal that much of the crucial research and extension work currently being carried out by LWA will not be taken over by other agencies," said Senator Rachel Siewert.

"I cannot believe how short-sighted this government is when it comes to securing the future of our agriculture and managing our natural resources."