The aim of an experiment conducted in 2006–2008 was to determine the effect of soil fertilization with Crop Care on the yield and chemical composition of carrot cultivars with orange- and purple-colored storage roots. The yield and chemical composition of three carrot cultivars: ‘Florida F₁^’ with orange-colored roots, ‘Deep Purple F₁‘ with purple-colored roots and ‘Purple Haze F₁‘ with roots that have a purple cortex and an orange core were compared in this study. Plants were grown in control soil with sufficient quantities of nutrients to support the development of carrot roots as well as in soil additionally fertilized with Crop Care. The results of the study showed that carrots of cv. ‘Florida F₁^’ produced a much higher total yield and marketable yield than carrots of cv. ‘Deep Purple F₁^’ and ‘Purple Haze F₁’. Additional fertilization significantly increased the marketable yield of the carrots. The edible parts of purple root cultivars were characterized by a higher content of dry matter, L-ascorbic acid and total carbohydrates. The application of the Crop Care fertilizer significantly increased the dry matter content of carrots. Roots of cv. ‘Deep Purple F₁^’ contained the highest levels of N, K and Mg, while cv. Florida F₁ was most abundant in Ca and Na.

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