文献类型： 外文期刊

第一作者： Shao Ming-jie

作者： Shao Ming-jie;Liu Wen-ke;Zhou Cheng-bo;Wang Qi;Li Bao-shi;Shao Ming-jie;Liu Wen-ke;Zhou Cheng-bo;Wang Qi;Li Bao-shi

作者机构：

关键词： ICP-AES; High light irradiation; Hydroponic lettuce; Nutrient absorption

期刊名称：SPECTROSCOPY AND SPECTRAL ANALYSIS （ 影响因子：0.589； 五年影响因子：0.504 ）

ISSN： 1000-0593

年卷期： 2021 年 41 卷 9 期

页码：

收录情况： SCI

摘要： As the largest band of light absorption of plant photosynthetic pigment, the red and blue spectrum is the main function spectrum of plant photosynthesis, and red-blue LED has become the mainstream light source of plant factories. The response of plants to red-blue light and its mechanism needs to be explored. In this study, effects of high light duration and alternating frequencies of high light supplied with red-blue LEDs on growth and nutrient element content as well as accumulation of hydroponic lettuce were conducted using ICP-AES analysis technology in an artificial plant factory. Five treatments were set up in experiment 1 : high light (500 mu mol . m(-2) . s(-1)) was irradiated for 0 h (CK) , 0. 5 h (HL0. 5), 1 h (HL1), 2 h (HL2) and 4 h (HL4) in the middle of the light period (150 mu mol . m(-2) . s(-1)) , respectively. In experiment 2, set up one conventional treatment (NL, 170 mu mol . m(-2) . s(-1)) and four alternate light treatments, in which 1 h high light was separated into four different alternating frequencies : one time (A1) , three times (A3) , six times (A6) and twelve times (A12). The light quality (4R ; 1B) photoperiod (16/8 h), and treatment days (20 days) were the same in the two experiments. The results showed that the biomass production and the accumulation of nutrients of lettuce such as N, C, P, K, Ca, Mg increased first and then decreased with the increase of high light duration. Compared with the CK, the root dry and fresh weight, and specific leaf weight of lettuce grown under HL4, increased significantly, and the leaf area decreased significantly. The dry weight of lettuce and the accumulation of N, C, P, K, Ca and Mg were the highest under HL2. Compared with NL treatment, A6 significantly reduced the fresh weight and increased the root shoot ratio of lettuce, but there was no significant difference among other treatments. The alternating light treatments significantly increased the C element content of lettuce, but the alternating frequencies of high light had no significant effect on the biomass production and the accumulation of nutrient elements. In conclusion, applying a short-term continuous high light irradiation in the middle of the light period can effectively improve the accumulation of nutrients and biomass production in lettuce and is more suitable for lettuce cultivation in plant factories.

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