Earlier quoted context omitted.
Some (likely outdated) idea to do with treating farming capacity as a strategic reserve.
Look, in war times, we can plant potatoes in all our gardens and take our spare meadows. We don't need these farmers in peace time; we really don't. They are leeches.
Norwegian farming policy is focused on maintaining near-independence in the food supply because the British embargo during the Napoleonic wars in the early 1800's is still seared in the collective consciousness. E.g. every Norwegian primary school child will go through the very long, very tedious poem "Terje Vigen" about a man who tried to evade the British embargo by taking a small boat to Denmark to get food to feed his starving family.
Starvation happened despite farming most of the available land.
The concern of local food production rose to prominence again during World War II, when German occupation meant strict rationing, which led to "fun" food innovation such as flour substitute made from bark, as growing vegetables etc. in your back garden simply doesn't produce enough for most people to sustain a family.