Seed to Seed
Any gardener who loves to play with seeds needs a copy of Suzanne Ashworth's Seed to Seed, published by the Seed Savers Exchange ($20, softcover). It's available from Amazon and other retailers, or you can order it through the Seed Savers Web site.
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To be fair to your seeds, you can fine tune your germination testing by providing optimum germination temperatures. The Alabama Extension service has an excellent table listing the preferred soil temperatures for vegetable seeds: Soil Temperature Conditions For Vegetable Seed Germination