文献类型： 外文期刊
作者： Guo, Jinghua 1 ; Yan, Yan 2 ; Dong, Lingdi 1 ; Jiao, Yonggang 1 ; Xiong, Haizheng 3 ; Shi, Linqi 1 ; Tian, Yu 1 ; Yang, Y 1 ;
作者机构： 1.Hebei Acad Agr & Forestry Sci, Inst Econ Crops, Shijiazhuang 050031, Hebei, Peoples R China
2.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Beijing 100081, Peoples R China
3.Univ Arkansas, Dept Hort, Fayetteville, AR 72701 USA
期刊名称：HORTSCIENCE （ 影响因子：1.455； 五年影响因子：1.617 ）
ISSN： 0018-5345
年卷期： 2019 年 54 卷 8 期
页码：
收录情况： SCI
摘要： Hydroponics has been an increasingly important field of vegetable production. However, a big issue with hydroponics is that certain crops can quickly accumulate high levels of nitrate-N (NO3 +/- -N) from the hydroponic system. The objective of this research was to decrease NO3 accumulation and increase the nutritional value and yield of vegetable crops using lettuce and oilseed rape as a model under hydroponic production. In this study, two technologies were applied to leafy vegetable production: 1) using supplementary lighting (blue-violet diode) by manipulating illumination and 2) removing fertilization before harvest for a short term (3 or 5 days), thus providing a practical experiment for improving yield and edible qualities of hydroponic leaf vegetable production. Illumination was applied 4 hours a day (0500-0700 HR and 1700-1900 HR) during good weather, or 12 hours a day during bad weather with insufficient natural light (< 2000 lux) during the autumn and winter seasons. Results showed that the lettuce cultivar Ou-Luo and the oilseed rape cultivar Ao-Guan Pakchoi had increased yield (50.0% and 88.3%, respectively), decreased NO3 content (26.3% and 30.8%, respectively), and increased total soluble solids (24.1% and 30.6%, respectively). The 5-day fertilizer-free treatment before harvest resulted in 19.2%, 6.4%, and 16.5% yield increases; and 26.0%, 24.3%, and 47.8% NO3 decreases in oilseed rape cultivar AoGuan Pakchoi and lettuce cultivars Da-Su-Sheng and Ou-Luo, respectively.
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