What threatens the fertility of Canada's farmlands?

Answer 1

Modern Farming practices have advanced to the point that we are well aware of what is required to maintain farmland fertility. Yet farming practices are still a threat because fertility of the land has value and costs money and time to create.

Climate in Canada has always been changing. It is not good to have a kilometer of ice sitting on top of farmland, and of course nothing is worst than having the retreat taking the farmland with it and leaving little but scoured bare rock behind.

When the Climate warms Canada gets more farmland and the farmland it already has gets longer growing seasons. Combine that with Canada's huge freshwater resources and climate change is huge positive for Canadian farming.

But at the end of the day the #1 threat to Canada's farmland fertility is Urban Expansion. Canada has build over much of it's most productive farmland and continues to so.

Farming practices and urban expansion are the greatest threat.