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Open AccessArticle

Nitrogen Fertilizer Levels Affect the Growth and Quality Parameters of Astragalus mongolica

by Lingling Wang 1,2,3, Lucun Yang 1,2, Feng Xiong 1,2,3, Xiuqing Nie 1,2,3, Changbin Li 1,2,3, Yuanming Xiao 1,2,3 and Guoying Zhou 1,2,*
1
Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
2
Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Xining 810008, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Molecules 2020, 25(2), 381; https://doi.org/10.3390/molecules25020381
Received: 26 November 2019 / Revised: 10 January 2020 / Accepted: 13 January 2020 / Published: 16 January 2020
Owing to overexploitation, wild resources of Astragalus mongolica, a Chinese herbal plant that is widely distributed in the arid and semi-arid areas of Northern China, have gradually become exhausted, and therefore, commercial cultivation is increasingly important to meet the growing demand for astragalus and reduce the pressure on wild populations. Nitrogen level is an important factor that affects the yield and quality of A. mongolica. However, uniform standards for fertilization among production areas have not yet been determined. In this study, the effect of nitrogen fertilizer treatment on the yield and quality of A. mongolica in the Qinghai-Tibet Plateau was explored using a control treatment (no added nitrogen, N0) and five different nutrient levels: 37.5 kg/ha (N1), 75 kg/ha (N2), 112.5 kg/ha (N3), 150 kg/ha (N4), and 187.5 kg/ha (N5). According to grey relational analysis, the optimal nitrogen fertilizer treatment was the N4 level followed by the N5 and N2 levels. Nitrogen fertilizer significantly increased the root biomass, plant height, root length, and root diameter. However, nitrogen fertilization had no significant effect on the content of Astragaloside IV and mullein isoflavone glucoside. The content of ononin and calycosin continually accumulated throughout the growing period. The results showed that the ononin and calycosin content under N4 and N2 is higher than other levels and there is not significantly different between different nitrogen fertilizer levels about them. The content of formononetin decreased gradually with the progression of the growing season. The optimal nitrogen fertilizer treatment for A. mongolica is recommended to be 150 kg/ha and the content of active compounds and yield were observed to reach the maximum in October. View Full-Text
Keywords: nitrogen fertilizer; Astragaloside IV; mullein isoflavone glucoside; harvest time; yield; Qinghai-Tibet Plateau nitrogen fertilizer; Astragaloside IV; mullein isoflavone glucoside; harvest time; yield; Qinghai-Tibet Plateau
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Wang, L.; Yang, L.; Xiong, F.; Nie, X.; Li, C.; Xiao, Y.; Zhou, G. Nitrogen Fertilizer Levels Affect the Growth and Quality Parameters of Astragalus mongolica. Molecules 2020, 25, 381.

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