they are not heavy feeders and don't require much nitrogen. However some varieties have very large tops compared to other varieties. I prefer to add fertilizer as side dressing to established plants. Sometimes fertilizer at planting can interfere with germination.
I agree that your root crops will thank you for a good hit of phosphorous to encourage strong root growth. Go real EZ on the nitro.
I'm sowing more carrot, turnip, and beet seeds this evening!
My current carrots are growing wonderfully well in two 15-gallon SmartPots. I'm planning on sowing more seeds in some deep containers that I can move around into the breezy shade. It'll keep them cooler. Also, I plan on covering them with the tulle I bought to keep the moths from using them as egg depots. I'll invest in some "Big Bands" rubber bands or some bungie cords to anchor the tulle.
Farmerdill- I didn't realize that fertilizer at sowing/planting time could interfere with germination. Is this true for all seeds? Could you explain a little more? How about when I put out transplants?