Hey there primageon,
First thing that I would recommend, is take a good look around the area at the other plants that are growing. How do they look ? Are they nice and healthy ? If they look good then cut back on the amount that you want to give your babies. You can always walk by there and quickly throw a handfull around the area that your growing in. The absorbtion rate will be dependant on a few things. The rain obviously breaks down the encapsulated ferts, and so does the sun. Anything walking on them will bust them too. I like to use the big fertilizer spikes that you drive into the ground near your grow, that way no-one see's the ferts that your thinking of sprinkling around out there.
Good luck with your outdoor, show us some pics when you get it all established, in the meanwhile we will smoke one in your honor, and think good thoughts for you and your babies.
:48:
smoke in peace
KingKahuuna