Carrot roots grow optimally at 15-18°C, while optimum shoot growth takes place at higher temperatures. Carrotsneed low temperatures to induce flowering. This crop enjoys light, stone-free, welldrained, fertile organic soils. Rich sandypeaty soils are perfect, providing the best conditions for the carrot roots to penetrate deeply and to bulk up. The soil's pH value should be between 6.5 and 7.5 for ideal development. Carrots have high potassium and calcium requirements. They need three times and twice the amount of these nutrients respectively compared to Nitrogen.
Potassium promotes solid, sweet carrots, while excessive Nitrogen causes branching and hairy, fibrous roots.