Folia Horticulturae

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Effect of differentiated nitrogen fertilization on changes of certain compounds in stored carrot roots

Stanisław Rożek, Maria Leja, Renata Wojciechowska

Department of Plant Physiology
Faculty of Horticulture, University of Agriculture in Kraków
29 Listopada 54, 31-425 Kraków, Poland

The results are presented of a two-year study, concerning the effect of nutrition with ammonium sulphate and urea, applied either by the broadcast or the placement method, on changes in nitrate, soluble sugar, carotenoid, and phenol content in stored carrot roots. During storage of the roots a decrease in nitrate level was observed, most distinct in the case of urea placement fertilization, when applied just before sowing and at the 3-4 leaf stage of the plant. The soluble sugar content diminished significantly, particularly in carrot treated with ammonium sulphate before sowing, both by the broadcast and the placement technique. A significant increase in total phenol level was found, most distinct in cv. Flacoro fertilized with ammonium sulphate and urea by the broadcast method. Carotenoid level was considerably higher in the roots of Joba than in those of Flacoro. Storage caused an increase in carotenoids in the roots of Joba, while in some samples of Flacoro a significant decrease in these constituents was noted. These changes depended both on the form of nitrogen fertilizer and on the technique of its application.

Rożek S., Leja M., Wojciechowska R., 2000. Effect of differentiated nitrogen fertilization on changes of certain compounds in stored carrot roots. Folia Horticulturae 12/2: 21-34.