Hi Lily --
Yes, you can say the name. I don't intend to bash them.
Too much nitrogen can cause problems with tomatoes. They need more phosphorous and potassium. Something like a ratio of 5-10-10 or 5-20-20, etc. Too much nitrogen can equal very little fruiting.
High heat can stop production as well. You can give tomatoes some shade in the heat of the day as long as they get at least 6 hours of full, direct sunlight.
