Governments around the county say they want to stop the loss of productive farmland to the urban sprawl yet it is happening each week.

Another farm just north of Melbourne, this time a 434ha grazing property, has just sold for what is believed to have been $100 million.

New South Wales and Victorian governments are both involved in developing new planning restrictions over farm sales.

Those mooted restrictions will come too late for many farms which are being sold for fortunes to land developers.

In this latest Melbourne sale, developers are looking at catering for 1000 new homes on the former Merri Park estate at Beveridge.

Beveridge is about 50km from Melbourne's city centre.

Agents Core Projects said the grazing property comprised of 900-1000 approved housing lots, 199ha of industrial land and 125ha of potential future development land.

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The farm was sold by the descendants of Sir Cecil Looker, a prominent businessman who was a private secretary to Sir Robert Menzies during World War Two and later chaired the Melbourne and Australian stock exchanges.

The farm was sold to a group of investors including developers Sino Integrity Group.

There is a debate in Sydney over government plans to sell unused farmland next to the Hurlstone Agricultural High School in Glenfield for what could make $200 million.

Under the plans, 88 hectares would be sold to developers which would then allow a 50ha farm to be developed on land kept for the school.

The school is about 40km from Sydney's city centre.

The latest Melbourne sale is still not Victoria's most expensive farm, that title remains with a former neighbour.

The 600ha beef grazing property, also at Beveridge, sold in 2018 for about $200 million.

At nearby Mickleham, a 214ha dairy farm owned by the Cocking family sold in 2016 at a price believed to be more than $60 million.

At the same time, the story of Edward, Garry and Keith Troutbeck was shared around the world when their family's 25ha dairy farm at Mickleham sold for what is believed to have been $50 million.

Their parents bought the place in 1935 for 500 pounds.

A 15ha apple orchard at Wantirna South to the east of Melbourne sold for close to $100 million in 2018.

Earlier this year a 83ha grazing farm at Nar Nar Goon sold to a property developer for $83 million.

The Victorian government is still digesting public comments on proposed planning reforms to extend protection for farm land and green wedges in a 100km radius of the city centre.

"The Victorian Government is committed to protecting Melbourne's green wedges and keeping farms on our urban fringes working and producing for generations to come," the government says.

"Some of Victoria's most productive agricultural land is within 100 km of central Melbourne. As our climate changes, the ideal conditions of agricultural land become even more important to Victoria's food production."