Effects of short-term treatment with various light intensities and hydroponic solutions on nitrate concentration of lettuce

文献类型： 外文期刊

第一作者： Liu, Wen Ke

作者： Liu, Wen Ke;Yang, Qi Chang

作者机构：

关键词： Lettuce;light intensity;nitrate reduction;petiole;prior to harvest

期刊名称：ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE （ 影响因子：1.694； 五年影响因子：1.568 ）

ISSN： 0906-4710

年卷期： 2012 年 62 卷 2 期

页码：

收录情况： SCI

摘要： A glasshouse experiment was conducted to investigate the effects of five days' treatment before harvest with various light intensities and seven hydroponic solutions on nitrate reduction in lettuce. The results showed that SPAD of new and expanded leaves were elevated by most of the hydroponic solutions under shading compared with the full nutrient solution, while no effect was demonstrated under non-shading. Additionally, lettuces under non-shading presented slightly higher leaf SPAD than those under shading. Nitrate concentrations of lettuce new leaves, expanded leaves and petiole were lowered significantly by all hydroponic solutions under shading and non-shading conditions compared with the full nutrient solution. Under non-shading, the efficiencies of seven hydroponic solutions varied largely, but no efficiency differences were showed under shading. N-free solution, 0.75 mM potassium sulphate solution and 5 x 10(-5) mM ammonium molybdate solution functioned more efficiently in reducing nitrate concentration both in expanded leaves and petiole of lettuce before harvest. In conclusion, proper light intensity is a key important factor that determines the efficiencies of nitrogen-free hydroponic solution treatments in lowering nitrate concentrations in leaf blades and petioles of lettuce before harvest.

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