Enhancing growth, quality, and metabolism of nitrogen of alfalfa (Medicago sativa L.) by high red-blue light intensity
文献类型： 外文期刊
作者： Chen, Yanqi;Liu, Jiayuan;Liu, Wenke
作者机构：
关键词： alfalfa;LED;nutritional quality;plant factory with artificial light;yield
期刊名称： JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE
ISSN： 1436-8730
年卷期： 2023 年
页码：
收录情况： SCIE（2023版）
摘要： Background: In countries characterized by limited per capita arable land and grassland, agricultural development is hindered by insufficient forage productivity. The plant factory with artificial light (PFAL) system has emerged as a highly efficient approach to address this challenge by cultivating forage on finite land resources. In the PFAL framework, the regulation of light intensity plays a critical role in determining both the yield and quality of cultivated plants.Aims: This study seeks to delve into the optimal range of light intensity for achieving high efficiency and quality in the production of alfalfa in the PFAL. Additionally, it seeks to explore the effects of light intensity on nitrogen metabolism, as well as the accumulation and metabolism of amino acid in alfalfa.Methods: To achieve these objectives, alfalfa was sown and subjected to five treatments involving red and blue LED light in a 4:1 ratio. The light intensities used were 200, 300, 400, 500, and 600 mu mol m(-2) s(-1), respectively. The alfalfa plants were then harvested at intervals of 15, 20, 25, 30, and 35 days. The quality and nitrogen metabolisms of alfalfa during this period were assessed by evaluating the plant's growth performance and determining the optimal cutting time.Conclusion: In summary, high-light intensity (400-600 mu mol m(-2) s(-1)) improved alfalfa yield and quality, while also promoting nitrogen and amino acid metabolism. Photon flux density at 400-500 mu mol m(-2) s(-1) light intensity for a duration of 30 days was identified as the optimal condition for PFAL alfalfa production.
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