You have to be careful adding sand to certain soils. We have a lot of clay here, and if you add sand, you get cement. Although carrots don't always do well in clay soil, I till the soil very well, then mound the soil for the rows fairly high so the carrots have a good 6" of good, loose topsoil. I get a few deformed carrots, but not many. Another tip if you don't have sandy soil: I till in a lot of leaves in the fall, and fresh grass clippings shortly before planting. The clippings decay much more slowly underground with limited oxygen. It retains a good amount of growing moisture, but helps drain water faster than clay alone.
You have to be careful adding sand to certain soils. We have a lot of clay here, and if you add sand, you get cement. Although carrots don't always do well in clay soil, I till the soil very well, then mound the soil for the rows fairly high so the carrots have a good 6" of good, loose topsoil. I get a few deformed carrots, but not many. Another tip if you don't have sandy soil: I till in a lot of leaves in the fall, and fresh grass clippings shortly before planting. The clippings decay much more slowly underground with limited oxygen. It retains a good amount of growing moisture, but helps drain water faster than clay alone.