Chemical composition of white and sarepta mustard seeds as affected by differentiated conditions of nitrogen top-dressing at sowing-preceding fertilization with sulphur and magnesium
2005
Nowak-Polakowska, H. | Czaplicki, S. | Tanska, M.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Food Plant Chemistry and Processing | Jankowski, K.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Plant Production
The chemical composition of seeds of white and sarepta mustard cultivated under different conditions of nitrogen top-dressing at the sowing-preceding fertilization with sulphur (30 kg/ha) and magnesium (6 kg/ha) was analysed in the study. Mustard seeds were determined for the contents of protein, fat, phenolic compounds and glucosinolates. The nitrogen top-dressing was demonstrated to exert a greater effect on changes in the contents of the chemical components examined in mustard seeds at the sowing-preceding fertilization with sulphur. At megnesium fertilization preceding the sowing, this effect was very limited or none. Changes in the content of the components analysed were greater in white mustard, and smaller in the sarepta mustard. A component demonstrating the greatest variability under the experimental conditions was protein whose content increased in the seeds of all mustard samples at the sulphur fertilization preceding the sowing. The content variability of fat, phenolic compounds and glucosinolates was small and not unidirectional in particular years of the study, and insignificant when determined as a multi-year average
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