Sue Clotere said:

What can we add to our soil to sweeten our tomatoes? We worked in
steer manure, chicken manure, and home made compost, at planting time.
Since then we have added blood meal, and more compost. The tomato size
is good and so is the flavor,but they lack the sweetnes that they had
in the past. Would be thankful for suggestions.

Some trace minerals might make a differents. Try foliar feeds of seaweed
spray. (I use Maxicrop powder.) Kelp meal is an ingredient of at least a
couple of different brands of fertilizer that are specially formulated for tomatoes.

IIRC, magnesium is sometimes suggested for sweeter fruit. Some folks give
a dose of Epsom salts (magnesium sulfate) to their tomatoes and melons.

--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)