"We have some of the best scientists in New Zealand working on this and they are telling us we need to reduce the amount of nitrogen from entering the lake by 320 tonnes."
This would be done by reducing 140 tonnes of nitrogen through Plan Change 10.
The remaining 280 tonnes would be removed through funding from the Crown and local councils by gorse conversion, engineering solutions, and the Incentives Scheme.
Regional council chairman Doug Leeder was encouraging landowners to make contact with the council.
He said being a farmer himself, he understood the consequences of the land management change but it was time now to act.
"The regional council team is ready to engage with landowners, to help them work out their nitrogen discharge allocation and develop new ways for them to get the most out of their land.
"Already we have landowners looking at new and exciting ventures for their land including sub-division and eco-tourism," Leeder said.
Although Plan Change 10 is before the court and not currently operative, it has a legal effect from the date of notification, February 29, 2016.
The brochure which outlines the new rules and landowner obligations can be viewed online here.
If you are a rural landowner in the Rotorua Catchment and do not receive a letter call Bay of Plenty Regional Council on (07) 921 3377 for help.