Organic fertilizer for 5 gallon buckets

[lmacdonald]

Hello,

This is my first year growing tomatoes. I started them from seed in the sunniest window in the house but was late in transplanting them the two times I did, so they aren't that big yet. They've been in 5 gallon buckets for about two weeks now, and I have only fertilized them so far with some rabbit poop tea a couple days ago. They are growing in bagged potting soil... and I was wondering what organic fertilizer would be best (and cheapest) now.

How does this look?: http://www.gardeners.com/All-Purpose...efault,pd.html

I have 12 buckets, 8 or 9 of which are doing pretty well, 3 or 4 I'm not sure if they're going to make it or not...if the above fertilizer is good, should I get 1 or 5 lbs. of it? I don't know if it matters, but they are heirloom tomatoes.

Thanks so much for any help.

Luke