Hi BetNC and thanks for taking the time to comment. You’re right in that adding one tablespoon of water soluble fertilizer to a gallon of water is pretty standard. That’s exactly why the advice to use some fraction of that (add only one half tablespoon for example) is not good advice for feeding your seedlings. One half tablespoon of 20-20-20, for example, is the same as one full tablespoon of 10-10-10 which will fry your new seedlings!
