TASMANIA'S GMO moratorium was essential, Oatlands farmer Brett Hall said.
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Written submissions to a state government review into the moratorium close tomorrow.
Mr Hall said the state government had taken a "brave but prudent" stance in legislating a ban on the commercial growing of genetically modified organisms.
"There is a significant risk that it would prove an impossible task to remove all the GMO material from the environment once the technology has been widely utilised," he said.
"The moratorium has been in place for over a decade and we have gained market access for our Tasmanian produce because of this point of difference.
"The cattle industry alone exports beef to Japan with an annual value of $45 million on the basis that it is GMO free.
"There is only one GMO crop currently approved by the Australian regulators that could be grown in the state, GM canola and projections for the benefit of growing this crop in Tasmania show an estimated annual farm gate income of $4 million.
"This would represent 0.15% of the annual $2.7 billion Tasmanian food and agriculture sector turnover (Macquarie Franklin, 2012).
"The amount of potential risk involved in growing this GMO crop for such a small gain does not stand the test of being an option economically, environmentally or socially.
"Since this estimation was completed there has been a huge increase in sales of GM free canola from Tasmania to Japan at a premium price and the projections are for this to be worth A$6-7million at the farm gate in the next five years."
But Tasmanian Poppy Growers president Glynn Williams said the GMO ban could lead to Tasmania's poppy industry losing out to states or countries that took advantage of the GMO crop's potential. DairyTas executive officer Mark Smith said the dairy industry supported a lifting of the moratorium because of the potential for GMO grasses to increase productivity.