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VCRB :: Contents of Volume 53/2000 :: Detailed information


EFFECT OF THE CULTIVAR AND NITROGEN FERTILIZATION ON THE CONTENT OF DIETARY FIBRE AND ITS COMPOSITION IN SOME CRUCIFEROUS VEGETABLES

Krystyna ELKNER
Research Institute of Vegetable Crops Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland


Summary

Contents of dietary fibre and its composition in broccoli, brussels sprouts, white cabbage, chineese cabbage and kohlrabi were analysed. Intercultivar differences and the impact of increasing doses of nitrogen fertilization were evaluated and recognized as influencing the contents of dietary fibre and its composition in investigated cruciferous vegetables. Broccoli and brussels sprouts were characterized by the highest dietary fibre content. The latter species had the most advantageous fibre composition within all the species investigated, considering its highest share of water-soluble fibre components in total fibre. Increasing doses of nitrogen fertilization had a lessening effect on the contents of total fibre in kohlrabi, brussels sprouts and broccoli, resulting from quantitative changes in particular fibre fractions. Along with increasing nitrogen doses, the contents of cellulose and hemicellulose fractions decreased. The contents of pectins, instead, grew until a specified nitrogen dose (different for each species tested) had been reached, and then, the further increase of the dose had either no effect or resulted even in a decrease of their contents.

keywords:dietary fibre, broccoli, brussels sprouts, white cabbage, chineese cabbage, kohlrabi, cultivars, nitrogen fertilization

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