Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (27): 6-15.doi: 10.11924/j.issn.1000-6850.casb2021-0360

Special Issue: 小麦

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Effects of Different Drip Irrigation Schedules on Soil Moisture, Wheat Growth and Water Use at Jiaodong Semi-humid Region

Wang Zhijun(), Wang Bisheng, Sun Xiaolu, Xu Mengjie, Yang Xiaohui, Hou Jinjin, Fang Quanxiao()   

  1. Qingdao Agricultural University, Laboratory of Farming and Ecology, Qingdao Shandong 266109
  • Received:2021-04-06 Revised:2021-05-30 Online:2021-09-25 Published:2021-10-28
  • Contact: Fang Quanxiao E-mail:1600400511@qq.com;fqx01@163.com

Abstract:

To cope with the obvious shortage of rainfall and irrigation water resources in winter wheat season at Jiaodong area, the effects of different irrigation schedules on soil moisture, winter wheat growth and water use efficiency were studied to explore the optimal irrigation mode for winter wheat. The experiment was carried out from 2016 to 2019 using drip irrigation method, four treatments of T1 (no irrigation), T2 (jointing stage irrigation, 40 mm), T3 (flowering stage irrigation, 40 mm) and T4 (jointing stage and flowering stage irrigation, 40 mm each) were designed with 3 replicates. The results showed that: (1) at jointing stage, the volume water content of 0-30, 30-60 and 60-90 cm soil in T2 and T4 was 16.0%, 25.5% and 25.1% respectively, which was higher than that of T1 by 25.9%, 5.5% and 4.7%, respectively; the soil water storage was 204.9 mm, which was 6.5% higher than that of T1, the leaf area index was 2.9, 26.3% higher than that of T1, and the biomass was 6124.8 kg/hm2, 29.0% higher than that of T1. (2) At flowering stage, the volume water content of 0-30, 30-60 and 60-90 cm for T3 and T4 was 12.8%, 22.7% and 22.8%, which was 36.6%, 11.2% and 6.7% higher than that of T1, respectively; the soil water storage, leaf area index and biomass were 188.7 mm, 2.2 and 10781.0 kg/hm2, 12.8%, 24.3% and 24.2% higher than that of T1. (3) Compared with T1, T2 showed higher grain yield by 16.5%, water consumption increased by 13.0%, and water use efficiency increased by 2.7%, and T3 showed higher grain yield by 26.4%, higher water consumption by 13.3%, and higher water use efficiency by 11.0%. the yield of T4 increased by 22.7%, water consumption increased by 23.9%, but water use efficiency decreased by 2.0%. Comparison among T2, T3 and T4 showed that the leaf area index, biomass and yield of T3 were 5.8%, 5.7% and 9.0% higher than that of T2, respectively, water consumption had little difference, water use efficiency increased by 8.7%, irrigation water use efficiency increase by 138.5%. Compared with T4, the biomass and yield of T3 had little difference, the water consumption decreased by 8.7%, but showed higher water use efficiency by 13.4%, and irrigation water use efficiency increased by 160.4%. Based on the three-year results, drip irrigation at flowering stage (T3 treatment) with 40 mm could be considered as the optimal irrigation schedule for winter wheat at the area.

Key words: drip irrigation, irrigation schedule, winter wheat, water use efficiency, soil water

CLC Number: