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| DOI：10.13522/j.cnki.ggps.2025155 |
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| Optimal water-saving irrigation for onion production in the Hexi Corridor |
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ZHANG Junfeng, LIU Shengming, AN Cuixiang, ZHANG Ting, SUN Caimei, ZHANG Huasheng
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1. Vegetable Research Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China;
2. Agricultural Technology Extension Service Center of Jinchuan County, Jinchang City, Gansu Province,
Jinchang 737100, China; 3. Northwest Normal University, Lanzhou 730070, China
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| Abstract: |
| 【Objective】The Hexi Corridor is a semi-arid region in Northwestern China, where water scarcity limits agricultural production, making improving irrigation water efficiency essential. Long-day onion is an important cash crop in the region, but its optimal water-saving irrigation remains elusive. This paper aimed to fill this knowledge gap, and experimentally explore suitable water-saving irrigation scheduling for long-day onion in this region.【Method】The experiment was conducted in a field, with the Hongjin red onion cultivar as the model plant. The experiment consisted of five irrigation treatments: 3 000 m3/hm2(T1), 3 675 m3/hm2(T2), 4 350m3/hm2(T3), 5 025 m3/hm2(T4), 5 700m3/hm2(T5); the control was irrigation of 7 650 m3/hm2 (CK). During the experiment, we measured the growth traits, yield and quality of the onion in each treatment.【Result】Compared with CK, reducing irrigation amount in the treatments did not result in significant effects on dry matter content, but reduced soil bulk density and increased soil porosity. Compared with CK, T1–T5 increased root activity by 6.72%, 8.06%, 31.45%, 15.32%, and 46.77%, respectively, and reduced malondialdehyde by 4.93%, 3.07%, 28.95%, 7.07%, and 62.57%, respectively. Reducing irrigation amount led to a decrease in onion yield. Compared with CK, T5 decreased onion yield and contents of soluble sugar, soluble protein, vitamin C, and onion oil by 11.19%, 5.18%, 2.54%, 1.17%, and 2.70%, respectively, while increasing water use efficiency and irrigation water use efficiency by 11.59% and 19.21%, respectively. In T5, the discard rate of onion was 3.46%, while its water waste rate was only 3.28%.【Conclusion】Comprehensive analysis indicates that the optimal irrigation amount for long-day onion in the study region is 5 700 m3/hm2, which can be used as an improved irrigation strategy for red onion production in the Hexi Corridor and regions with similar soil type and climate. |
| Key words: Hexi Corridor; long-day onion; water-saving irrigation; water use efficiency; water waste rate |
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