Sterilizing Garden Soil

Question

In this article https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/sterilizing-soil.htm you describe methods for sterilization. I noticed in the oven method you said not to allow it to go above a certain temp. 180. Stating that it releases toxins. How does it do this? What kind of toxins? Are they dangerous to humans and/or the plants and why? What doe it do?
The reason I am asking is that there is another popular method called solarization which uses the sun and plastic to heat dirt to a desired temperature. But all this article stated was you needed to be above a temperature nothing about toxins and such. http://www.yourepair.com/1794/how-to-sterilize-garden-soil-of-pests-and-bacteria-without-harsh-chemicals.html
And in certain places in the world the sun heats the soil/dirt up to temperature that are scorching. So this is why I’m confused.

Thank you for your time.
-Cecily R.

Answer 1

This link will answer your questions.
http://phytosphere.com/soilphytophthora/soilsterilization.htm