Due to the deep-reaching root system which allows nutrient uptake from deeper layers of the soil, carrots have moderate fertilization needs. The nutritional requirements of carrots as regards nitrogen are defined as average, they are low as far as phosphorus and magnesium are concerned and high for potassium. With a yield of 100 fresh mass (roots + leaves), they take up 170 kg N, 36 kg P, 410 kg K and 21 kg Mg. In carrot cultivation, the optimal content of available forms of macronutrients in the soil should amount to (in mg/dm3): 50-80 N, 40-60 P, 120-150 K, 60-80 Mg and 1000-1200 Ca, however, deadlines for the application of fertilizers and their doses are defined on the basis of soil richness analysis, considering the intended use of crops, soil conditions, locality, cultivar and – in top dressing – weather conditions, especially the amount of precipitation. The decision on the commencement of irrigation should be taken on the basis of plant observations and organoleptic inspections of the soil moisture level. Apart from the accurate determination of the nitrogen dose, it is also very important that the date of the last top dressing treatment be properly selected depending on the planned harvest date. Delayed application or too high a dose can cause nitrite and nitrate accumulation in plants, which is a natural process in their physiology. High water deficiencies during the growing period can reduce the yield by even 50% and deterioration of the root quality. If insufficiently hydrated, carrot roots are thin and pointed and high humidity fluctuations in the soil will cause them to crack. Carrots are sensitive to soil salinity and react to it by delayed emergence and seedling death. Micronutrients are a significant factor in the production of good quality carrots. It is sensitive to deficiencies of some micronutrients and especially of copper, boron and zinc. Carrots grow poorly in stressful situations, e.g. as a result of cold weather, drought or excessive soil moisture. It responds very well to foliar feeding with one of the compound fertilizers. It should be remembered that the foliar fertilization of carrots should be completed 4 weeks before harvesting. Foliar fertilization of carrots with fertilizers manufactured by ADOB and on the basis of the fertilization programme we propose ensures the quick supplementation of nutrients, both in the case of their deficiency in the soil and their inhibited uptake and comprehensive provision of macro- and micronutrients. The promptly observed deficiency and application of an appropriate foliar fertilizer will result in an appropriate supply of all nutrients to the plants. It should be emphasised that even deficiencies of single micronutrients can be a serious factor which will limit the production.