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The effect of light-emitting diode (LED) supplemental lighting on the folate and polyphenols content as well as antioxidant properties of Valerianella locusta (Lamb's lettuce) cultivated in greenhouse in autumn and winter seasons was evaluated. Six LED-lightning combinations were used. Four of them differed in percentage share of red (R) and blue (B) in emission spectrum: 100%R, 90%R/10%B, 70%R/30%B,...
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