When did you buy and plant the tree? When did you prune the tree?

I bought one last September, and the other around the end / beginning of the year. They have been in the ground since then.

I pruned them a month ago. Does pruning make that much a difference? Did you ever hear of spraying the leaves with fish emulsion to force blooming?

I think you probably could have left them alone. They weren't in the ground long enough for there to really be a problem of not fruiting. If you went a year without fruit I'd be concerned. You should probably just leave them alone. Keep on taking care of them but don't try to force them to bloom. No need to especially after only a few months in the ground.