Wouldn't it kill all the bacteria too? But maybe if you're just starting seeds in the soil you don't care.I've heard of that though it's been years. Where I saw it was that if you use regular dirt to start seeds you bake it to kill anything in it. I think it was not so much insects or such, though it would do that, but more for mold spore that can cause damping off. As I recall that suggestion was to use your grill. not your oven. Don't catch it on fire. You don't want to burn up the organic matter in soil.
the question is often raised because of mold issues in starting mixes, some people have trouble with damping off. in my experience this is trouble with infected seeds, poor quality seeds, too much or too little water and then also temperature not being appropriate for the seeds.Wouldn't it kill all the bacteria too? But maybe if you're just starting seeds in the soil you don't care.