They're root tabs. You're not gunning for a specific dosage, really. You're just trying to get enough ferts to the roots of heavy root feeders.
So I don't think you have to worry so much about dosage.
If you want to get into the nitty gritty, it's easy to monitor your plants over the course of a month or two to see what they need more of. Then add more of that to your next clay batch.