OK, speaking as an old engineer, let me add maybe a half-cent's-worth: If you can somehow figure out what relative humidity corresponds to 8% moisture content in the seeds (maybe a plant scientist can help here) there are well-established tables of RH versus composition for a number of mixtures, such as water-salt solutions. If you can find the RH you want, then it's easy to make up these solutions and just suspend the seeds over that solution in a sealed container for some time to equilibrate, then zip the seeds up in a bag for storage.
If someone wants to provide the target RH value, I'm happy to look up the solution needed (the CRC Handbook has lots of tables of these things, and I would assume this information can now be found readily on line).
Place the seeds in a small uncovered disposable "tupperware". Float it on the chosen solution in a larger container and snap on the lid. Wait a few days, then transfer the seed to a zip-lock bag. Voila.
On Friday, September 18, 2020, 05:04:30 PM EDT, Carolyn Dorsh via pbs <pbs@lists.pacificbulbsociety.net> wrote:
My additional two cents...
1). Make sure that your seeds are indeed sufficiently dry for storage. I have heard that in general 8% moisture is the ideal level. I don’t have the means to measure it, but seeds often need to be drier than they appear. Even though seeds may seem dry when harvested off of a plant they may require a few days of further drying.
2) if you are going to put the seeds in plastic bags in the refrigerator it is recommended to use the thicker freezer bags-it will help keep out moisture.
Hope it goes well.
-Carolyn Dorsch
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