Priit Põldma

Estonian University of Life Sciences, Tartu, Estonia

Ulvi Moor

Estonian University of Life Sciences, Tartu, Estonia

Tõnu Tõnutare

Estonian University of Life Sciences, Tartu, Estonia

Koit Herodes

University of Tartu, Estonia

Riin Rebane

University of Tartu, Estonia


The aim of the research was to find out how foliar selenium (Se) treatment in open field conditions affects plant nutrition, yield and bulb bioactive properties. 10, 50 or 100 μg·mL-1 Se, referred to as Se10, Se50 and Se100 treatments, was applied to onion ‘Hercules’ in 2008 and 2009. Bulb weight, total yield, content of total Se, free selenomethionine and selenomethylselenocysteine, total S, N, P, K, Ca and Mg, content of total phenolics, pungency and total antioxidant capacity (TAC) were determined. All Se treatments significantly reduced bulb S content. The Se100 treatment had a tendency to decrease bulb size and yield. The Se50 treatment increased total Se content, total phenolics and TAC and had a tendency to increase the yield. A larger proportion of total Se was converted into organic compounds in the Se50 than in the Se100 treatment. In Se 10 treatment, bulb TAC was the highest among treatments in 2009. Considering both agronomic and human health benefits, Na2SeO4 solution at the rate of 50 μg·mL-1 Se can be recommended for bulb onion.


selenoamino acids, sulfur, total phenolics, pungency, antioxidant capacity

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Priit Põldma 
Estonian University of Life Sciences, Tartu, Estonia
Ulvi Moor 
Estonian University of Life Sciences, Tartu, Estonia
Tõnu Tõnutare 
Estonian University of Life Sciences, Tartu, Estonia
Koit Herodes 
University of Tartu, Estonia
Riin Rebane 
University of Tartu, Estonia



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