I've updated the Seed Details page with Crop and Seed Yield info. I have about half the seeds complete and still working on the rest, but most of the important seeds have their yields displayed.
I'm in the process of filling in the rest of the info which will take a couple more weeks.
Crop and Seed Yield info is displayed for each soil type. The order is:
Grade 1-3 La Noscean & Thanalan / G1 Shroud / G2 Shroud / G3 Shroud