EFFECT OF NITROGEN FERTILISATION ON THE MARKETABLE YIELD AND NUTRITIVE VALUE OF ONION
Dorota Wichrowska
University of Science and Technology in BydgoszczTadeusz Wojdyła
University of Science and Technology in BydgoszczStanisław Rolbiecki
University of Science and Technology in BydgoszczRoman Rolbiecki
University of Science and Technology in BydgoszczPiotr Czop
University of Science and Technology in BydgoszczBarbara Jagosz
University of Agriculture in KrakowWiesław Ptach
Warsaw University of Life SciencesAbstract
The nutritive compounds of the onion are influenced by genetic as well environmental factors. Due to its shallow poorly-developed root system, onion has a low potential of using nutrients from soil. Usually mineral fertilisation increasing the yield and change the chemical composition in vegetables, and it is the chemical
composition which determines the nutritive value of onion. Over 2003–2006 at Korytowo, about 30 km away from Bydgoszcz, northwards, 2-factor field experiments were set up in ‘split-plot’, in three reps. The aim of the study has been to determine the effect of the nitrogen rate (0, 60, 120, 180 kg N·ha–1) on the content of dry matter, vitamin C and monosaccharides and total sugar in onion of two cultivars: Kutnowska and Efekt. Increasing nitrogen fertilisation has resulted in a decrease in the content of dry matter in the bulbs of the onions under study. The ‘Kutnowska’ showed a higher content of total sugar and, at the same time, a lower content of monosaccharides than ‘Efekt’. ‘Efekt’ reacted with an increase in the content of vitamin C and monosaccharides as affected by higher fertilisation rates. A different reaction was noted in ‘Kutnowska’. The lower the dry matter content in onion bulbs – the greater content of total sugars and less content of monosaccharides.
Keywords:
Allium cepa, dry matter, fertilisation, monosaccharides, total sugar, vitamin CReferences
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University of Science and Technology in Bydgoszcz
University of Science and Technology in Bydgoszcz
University of Science and Technology in Bydgoszcz
University of Science and Technology in Bydgoszcz
University of Science and Technology in Bydgoszcz
University of Agriculture in Krakow
Warsaw University of Life Sciences
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