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Chinese Agricultural Science Bulletin ›› 2026, Vol. 42 ›› Issue (4): 75-82.doi: 10.11924/j.issn.1000-6850.casb2025-0518

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Effects of Different Drip Irrigation Rates on Growth, Yield and Quality of Walnut Trees in Southern Xinjiang

LI Yuan1(), KANG Huiru2, PENG Bo3, WU Lianxia2, XIA Weixin4, BI Haiyan5()   

  1. 1 Institute of Agricultural Resources and Environment, Xinjiang Academy of Agricultural Sciences, Urumqi 830091
    2 Xinjiang Yehe Agricultural Science and Technology Co., Ltd., Urumqi 830028
    3 Xinjiang Forestry School, Urumqi 830024
    4 Xinjiang Shiyongda Agricultural Science and Technology Co., Ltd., Urumqi 830009
    5 Agricultural Technology Extension General Station of Xinjiang Uygur Autonomous Region, Urumqi 830002
  • Received:2025-06-24 Revised:2025-11-19 Online:2026-02-27 Published:2026-02-27

Abstract:

In order to improve the water resource utilization efficiency of orchards in southern Xinjiang, the effects of different drip irrigation rates on the growth, yield and quality of mature walnuts were studied. From 2022 to 2023, taking 15-year-old walnut tree, ‘Xinxin 2’, as the object, five treatments, 7350 m3/hm2 (W0), 7350 m3/hm2 (W1), 7800 m3/hm2 (W2), 8700 m3/hm2 (W3) and 12000 m3/hm2 (CK) were set up in this research to study the effects of different irrigation amounts on soil moisture content, growth, yield and quality of walnut. The experimental results showed: (1)With the increase of drip irrigation, the soil moisture content increased rapidly, and when drip irrigation was 1500 m3/hm2, the shallow soil water above 0-180 cm was mainly supplemented. From the first irrigation to the next irrigation, the moisture content of shallow soil from 0 to 100 cm fluctuated greatly due to surface evaporation and transpiration, while the moisture content below 100 cm fluctuated little. (2) The increase of drip irrigation had significant effects on shoot growth and the longitudinal diameter of fruit. The growth of new shoots, fruit longitudinal diameter and net photosynthetic rate of W0 treatment were significantly lower than those of other treatments. New shoot growth and photosynthetic rate of W1, W2 and W3 treatments were significantly lower than CK treatments, but there was no significant difference in fruit longitudinal diameter between them and CK treatments. (3) Compared to CK treatment, the yield under W0 treatment was reduced by 13.37% and 13.4% respectively in 2 years. There was no significant difference in yield between W1, W2 and W3 treatments and CK treatments. The walnut shell in W1 treatment was significantly thicker than that of other treatments, and the kernel yield was lower than that of other treatments. Combined with the growth physiology and yield quality characteristics of walnut, the recommended irrigation rate of walnut was W2 treatment.

Key words: different drip irrigation, water use efficiency, walnut, yield, growth and development