Consider lightening up the soil, especially if you have clay ! Add sand , vermiculite , potting soil ,last years leaves, especially add compost
Around here , I always add sand, vermiculite , or old chopped-up leaves to all 'root crops '.
A lighter soil will result in straighter carrots , and fewer crop deformities .
Oh, TIKilty, thanks so much for your advice. We DO have clay soil! I was going to put my experiments in pots, but I might have to go for a ground plot, as I might run out of pots!...in which case, it would be critical to do as you suggest!
I just read your suggestion to Darlin, who definitely ratifies it!