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Article

Effects of Regulated Deficit Irrigation on Yield and Quality of Isatis indigotica in a Cold and Arid Environment

1
College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, China
2
Xinjiang Bazhou Academy of Agricultural Sciences, Korla 841000, China
3
Yimin Irrigation Experimental Station, Zhangye 734500, China
*
Author to whom correspondence should be addressed.
Academic Editor: Arturo Alvino
Water 2022, 14(11), 1798; https://doi.org/10.3390/w14111798
Received: 31 March 2022 / Revised: 28 May 2022 / Accepted: 31 May 2022 / Published: 2 June 2022
(This article belongs to the Section Water, Agriculture and Aquaculture)
Although regulated deficit irrigation may improve crop yields, little research has been conducted on the effects of water deficits on Isatis indigotica, a popular herbal medicine. Field experiments were conducted in 2016 and 2017 to study the effects of regulated deficit irrigation on the net photosynthetic rate, yield, water use efficiency (WUE), and quality of I. indigotica in northwest China. Plants at the vegetative and fleshy root growth stages were subjected to mild, moderate, and severe water deficits, and their photosynthetic physiological indexes, yield, and WUE were measured. Moderate and severe deficits, but not a mild deficit, significantly decreased the net photosynthetic rate and dry matter accumulation. The yield and WUE under mild deficit were markedly higher, reaching 8239.56 kg·ha−2 and 8390.80 kg·ha−2, respectively, in the vegetative stage and 24.11 kg·ha−2·mm−1 and 23.62 kg·ha−2·mm−1, respectively, in the fleshy root growth stage, while severe deficits significantly reduced yield and WUE. Mild and moderate deficits increased the content of (R,S)-goitrin, indirubin, and indigo, improving root quality, but severe deficits decreased these compounds. Therefore, a mild water deficit in the vegetative and fleshy root growth stages is optimal and can reduce water consumption and improve I. indigotica quality and WUE without reducing yield. View Full-Text
Keywords: water deficit; dry matter; yield; quality; water use efficiency; Isatis indigotica water deficit; dry matter; yield; quality; water use efficiency; Isatis indigotica
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MDPI and ACS Style

Wang, Y.; Zhang, H.; He, Z.; Li, F.; Wang, Z.; Zhou, C.; Han, Y.; Lei, L. Effects of Regulated Deficit Irrigation on Yield and Quality of Isatis indigotica in a Cold and Arid Environment. Water 2022, 14, 1798. https://doi.org/10.3390/w14111798

AMA Style

Wang Y, Zhang H, He Z, Li F, Wang Z, Zhou C, Han Y, Lei L. Effects of Regulated Deficit Irrigation on Yield and Quality of Isatis indigotica in a Cold and Arid Environment. Water. 2022; 14(11):1798. https://doi.org/10.3390/w14111798

Chicago/Turabian Style

Wang, Yucai, Hengjia Zhang, Zhongsheng He, Fuqiang Li, Zeyi Wang, Chenli Zhou, Yi Han, and Lian Lei. 2022. "Effects of Regulated Deficit Irrigation on Yield and Quality of Isatis indigotica in a Cold and Arid Environment" Water 14, no. 11: 1798. https://doi.org/10.3390/w14111798

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