You could, but it probably isn't necessary. After the 1st fruit set, a side dressing should be ok., but I'm not familiar with that fert,--- high in N isn't ideal for tomatoes. I'm guessing it's the temperature of the soil, though. Containers are going to warm up quicker in the spring, so growth may be enhanced in the beginning. Any side dressing should be scratched into the 1st couple inches.

Have you mulched the ground ones? If so, pull it back a bit from the root zone until the temps get up there.

Kevin

The container soil is probably the biggest factor.

Soil-less mix and/or potting soil lets the roots develop faster.

If you had dug a hole the same size as your container for your in ground tomatoes and filled it with the same soil they would probably be equal.

I think I found the website. It says that the broadcast rate for all those products is 1 tablespoon per square foot.

I don't think that could really hurt.

"Feeds continuously up to 9 months" though, so only once per season.