Mineral composition of white and sarepta mustard under diversified conditions of top dressing with nitrogen compared to pre-sowing fertilization with sulphur and magnesium
2006
Markiewicz, K.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Commodities Science and Food Evaluation | Zadernowski, R.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Food Plant Chemistry and Processing | Markiewicz, E. | Wiczkowska, J.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Commodities Science and Food Evaluation | Jankowski, K.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Plant Production
The experimental material included seeds of white and sarepta mustard obtained from experimental tillage with variable fertilization treatments: pre-sowing fertilization with sulphur and magnesium as well as different variants of top-dressing with nitrogen. The mustard seeds were determined for the contents of: macro- (Cu, Mn, Zn and Fe) and microelements (Ca, Mg) with the atomic absorption spectrometry, Na and K - with an emission technique, P - with a colorimetric-molybdate method, and S - with a nephelometric method with BaCO3. In the mustard samples analysed, the contents of copper and manganese were found not to depend on the diversified fertilization and accounted for 4.3-5.9 mcg/g d.m. and 20 to ca. 30 mcg/g d.m., respectively. The average content of Zn in the samples of white mustard seeds was nearly twice as high as that reported for the sarepta mustard seeds and did not depend on the fertilization applied. The mean contents of iron ranged from ca. 70 mcg/g d.m. (sarepta mustard) to ca. 80 mcg/g d.m. (white mustard). Compared to the seeds of sarepta mustard, those of the white mustard were characterized by a lower average content of sodium. The mean contents of potassium and magnesium in the seeds of the mustards compared were alike and ranged from 8.4 to 9.3 mg/g d.m. and from 3.1 to 3.4 mg/g d.m., respectively
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