Folia Horticulturae

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Protein composition of Brussels sprouts as affected by the date of seed sowing and nitrogen fertilization

D. Ściążko*, E. Kołota**, U. Tyrakowska-Bielec*

**Institute of Storage and Biochemistry
**University of Agriculture
**Słowackiego 17, 71-434 Szczecin, Poland
**Department of Vegetable Crops
**University of Agriculture
**Cybulskiego 34, 50-205 Wrocław, Poland

Brussels sprouts were cultivated from direct seeding to the open field in early or late April and fertilized with ammonium nitrate, urea, or slow released N at the rates 0, 100, 200, and 300 kg N/ha. In samples of sprouts collected at the end of November the total protein content and amino acids composition were determined.

The results of the study showed that an early seed sowing date did not affect the protein content and value of the essential amino acids index (EAA), but was favourable for the amount of amino acids. Nitrogen fertilizer increased the crude protein content but did not affect its quality or composition. A more adventageous effect on the biological value of Brussels sprouts protein was observed in treatment where slow release nitrogen fertilizer was applied than in those where soluble N sources were used.

Ściążko D., Kołota E., Tyrakowska-Bielec U., 1990. Protein composition of Brussels sprouts as affected by the date of seed sowing and nitrogen fertilization. Folia Horticulturae II/2: 3-12.