this is what i got from the internet
Dry Heat: The seeds are baked dry in an oven at 140° to 220°F for 4 - 10 hours, or are microwaved for 30 seconds to 4 minutes. Gives erratic results.
Sulfuric acid or lye soaks work with some seeds.
this is just a small paragraph of a huge article about starting seeds and the numerous methods of doing it. if you want to see the whole article let me know.
if you are talking about vegetable, the only seeds that really need bottom heat are eggplants, and peppers. toamtoes do not need the bottom heat. a simply 20 or 30 dollar heat mat will do the trick also.
