The temp is controlled on the oven to dry the seed the right amount. Desiccant will take moisture out of the air but not out of the seed - it appears moisture has to be forced out of the seed and controlled heat does that. Somewhere I have the Seed to Seed book. I suppose storing seed for years is a personal option as to method.
Not to be argumentative.
They state to put the seeds and dessicant both into an airtight jar or container.
Also, be careful with legumes, if they get too dry they won’t sprout according to that link.
http://www.southernexposure.com/drying-seed-with-color-indicating-silica-gel-ezp-26.html
A lot of people don’t have ovens that will allow temp to be set at 100F. Lowest temp on mine is 175. So I don’t have a choice with method :P
I like that the dessicant can be regenerated in any sort of oven and if tshtf it might be difficult to get one that’s exactly 100F.
If you have that seed to seed book, set aside a bit of time with a cup of tea to peruse it. Very interesting if you’re a geeky into gardening sort like me. I’m still considering the corn baggie thingies that SE has. Looks like I won’t be getting my corn into the ground as early as I’d planned this year. It’s currently 37F in my backyard. Normally I’d have corn in the ground already as it would already be warm enough. Not so much with the warm this year. Bastardi is already indicating that the great lakes region might be in for a ‘year without a summer’. Let’s hope Bastardi is wrong.