I'll be trying some 21 gram fertilizer tablets this year along with osmocote in my potted citrus liners. Anyone else used these?

http://www.agritab.com/AgriformAgSafe.htm

They are a little cheaper than the Scotts pellets I can get ordered locally.

Never tried that particular brand, however, I am not a big fan of tablets. I am a big fan of Osmocote slow release fertilizer. For container trees my program has converted to 4-grams of Osmocote per liter volume of the container, applied in March, July and mid September, plus an occasional application of regular water soluble fertilizers. - Millet