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Nitrate concentration in edible parts of plants is still at the center of interest. Nitrate metabolism in plants is regulated among others by light. Therefore, the effect of LED and HPS lamps, as supplemental to solar radiation, on nitrate concentration and metabolism in Valerianella locusta ‘Nordhollandse’ was tested (in 30th and 60th day of lighting, at noon and evening hours). In two years of study,...
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