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| DOI：10.13522/j.cnki.ggps.2024285 |
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| Effects of regulated deficit irrigation on leaf physiology, seed yield and water use efficiency of industrial hemp |
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GAO Jinhu, FENG Xuping, ZHAO Mingsen, KONG Jiaqian, MENG Xiaokang, KANG Hongmei
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Institute of Industrial Crops, Shanxi Agricultural University, Taiyuan 030031, China
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| Abstract: |
| 【Objective】Industrial hemp (Cannabis sativa L.) is sensitive to water stress at certain stages, and efficient water management is thus essential for improving its productivity and sustainability in arid and semi-arid regions. This paper investigates the effects of regulated deficit irrigation (RDI) on leaf physiological traits, seed yield, water consumption and water use efficiency (WUE) of industrial hemp.【Method】The experiment was conducted in a rain shelter where RDI was imposed during the vigorous growth stage (R) and the grain filling stage (G). There were three irrigation amount treatments at each of the two stages: sufficient irrigation by keeping soil water content at 70%-80% of the field capacity at the R and G stages (R1, G1), mild deficit irrigation by keeping soil water content at 60%-70% of the field capacity at the two stages (R2, G2), and severe deficit irrigation by keeping soil water content at 50%-60% of the field capacity at the two stages (R3, G3). Overall, there were nine treatments. In each treatment, we measured leaf physiological traits, seed yield, and water consumption and water use efficiency of the hemp.【Result】Regulated deficit irrigation significantly altered leaf photosynthetic traits, superoxide dismutase (SOD) and peroxidase (POD) activities, and the leaf area index. Imposing deficit irrigation during the vigorous growth stage markedly influenced branch numbers, branch height and seed yield. The impact of treatments was ranked in the order of R1＞R2＞R3. Among all treatments, sufficient irrigation at both stages produced the highest grain yield, but it was only 0.2% higher than that of the second-highest treatment R1G2. Deficit irrigation at both stages interactively influenced seed yield, water consumption, water use efficiency and irrigation water use efficiency. Balancing seed yield, yield components and water-related indices, the optimal irrigation strategy was identified using principal component analysis.【Conclusion】Sufficient irrigation at both stages led to the highest productivity. When water supply is limited, sufficient irrigation during the vigorous growth stage combined with mild deficit irrigation during the grain filling stage is an optimal alternative. |
| Key words: industrial hemp; regulated deficit irrigation; leaf physiology; water use efficiency; yield |
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