engleski

Influence of nitrogen fertilization on the chemical composition of amaranth (Amaranthus spp.) seed

The goal of the research carried out in Zagreb (Croatia) in the period 2002-2004 was to determine the influence of nitrogen fertilization on the seed chemical composition of two grain amaranth varieties belonging to different species: G6 (Amaranthus cruentus L.) and 1008 (Amaranthus hypochondriacus L.). Nitrogen was applied before sowing at the rates of 0, 50 and 100 kg N ha-1. No significant effect of nitrogen fertilization on the seed concentrations of crude protein, fats, fibre, starch or total sugars was recorded in any trial year. The studied species did not differ in the seed chemical composition. High concentration of essential amino acids, points to the high nutritive value of amaranth seed and to its potential use in human diet. Nitrogen fertilization (50 and 100 kg N ha-1) led to a significant increase in arginine and tyrosine concentrations. Amaranthus cruentus L. had significantly higher concentrations of valine and leucine.

grain amaranth; nitrogen fertilization; seed chemical composition; amino acids

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