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Start with half of a tablespoon, and never use two tablespoons. one at the most. generic plant food schedules are about twice as strong as it should be for cannabis.
from the light schedule you provided, you only have it on 12 hours of light already? it's a little early to be flowering, try and up that schedule to 18 hours of light so the plant can vegetate.
what kind of lighting are you planning on using for flowering? you'll need to be very careful it gets no light during its 12 hours of darkness at that time, and you'll need at least a few extra cfl's to be sure you're getting all the light you need.
hey fad...with seeds it is better to start with 12 hours increasing slowly over time just as in nature going to 18 hours to fast or starting on light schedule of 18 hours or more can result in higher frequency of males...with only one seed going i would let mother nature dictate the lighting schedule and your chances of having a girl greatly increase....check the link on my bottom sig...its a page from Jorges book on getting more girls from seeds!:thumbsup: