Nutrient burn, is FloraNova a good thing to use?

A question of a fellow grower:
We just started growing this year and I think we had nutrient burn. We didn’t lose the plants but we want to make sure it doesn’t happen again next year. The leaves had brown spots and were curling up. It was only on the bottom half of the plant. When we transplanted them, we put root enhancer in the hole before putting the plant in. I think that was our problem, do you think maybe it was? We’ve purchased FloraNova, is that a good thing to use? Thanks