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| DOI：10.13522/j.cnki.ggps.2025250 |
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| Effects of water deficit in different growing stages on growth, yield and quality of potato |
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ZHAO Yan, LI Zhe, ZHANG Hengjia
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1. Gansu Yasheng Agricultural Research Institute Co., Ltd., Lanzhou 730010, China;
2. College of Water Resources and Hydropower Engineering, Gansu Agricultural University, Lanzhou 730070, China;
3. College of Agriculture and Biology, Liaocheng University, Liaocheng 252059, China
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| Abstract: |
| 【Objective】Potato is a common crop grown in arid and semi-arid regions in Northwestern China where water-deficit irrigation has been widely used to save water without compromising crop yield and improve food quality. However, how implementing deficit irrigation at different growing stages of potato affects its growth and yield is not well understood. This paper aims to fill this technical gap.【Method】An experiment was conducted from April to September 2024 in a potato field under mulched drip irrigation at the Yimin Irrigation Experiment Station in Zhangye City, Gansu Province. It consisted of eight treatments: mild water-deficit irrigation by controlling soil moisture content at 55% to 65% of the field capacity (WD1, WD3, WD5, WD7), moderate water-deficit irrigation by controlling soil moisture content at 45% to 55% of the field capacity (WD2, WD4, WD6, WD8), and sufficient irrigation by maintaining soil moisture content at 65% to 75% of the field capacity (CK), at different growth stages of the potato. In the experiment, we measured growth traits, yield and quality of the potato.【Result】Compared with CK, water deficit at different growth stages significantly (P＜0.05) reduced plant height, stem diameter and leaf area, with the reduction degree increasing with the severity of water deficit, ranging from 5.33% to 14.31%, 5.70% to 13.74%, and 5.53% to 20.29%, respectively. Compared with CK, mild or moderate water deficit at the seedling stage combined with a mild water deficit at the tuber formation stage increased yield by 2.26% to 8.77%. The WD1 had the highest starch content, which was 12.98% higher than that of CK. All water-deficit treatments had lower protein content than CK, with the WD8 showing the lowest (21.63% lower than CK). The sugar content reduction in all water deficit treatments was higher than that in CK, with the WD2 being the highest (33.93% higher than CK). The WD2 had the lowest vitamin C content, which was 21.48% lower than that of CK. Evaluation based on the entropy weight-TOPSIS method showed that a mild water deficit at the seedling stage (WD1) had the highest comprehensive score (0.605).【Conclusion】Implementing a mild water-deficit irrigation by keeping the soil moisture content at 55%-65% of the field capacity during the seedling stage is an optimal irrigation strategy for potato production in the Hexi Oasis in Northwestern China. |
| Key words: water deficit regulation; growth characteristics; yield; quality; comprehensive evaluation; potato; Hexi Oasis |
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