Volume 31 Issue 9
Sep.  2023
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Abstract
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LIU Z M, LI L, LI H T, LIU N, WANG H X, SHAO L W. Changes and influencing factors of crop coefficient of summer maize during the past 40 years in the North China Plain[J]. Chinese Journal of Eco-Agriculture, 2023, 31(9): 1355−1367. DOI: 10.12357/cjea.20230197
Citation: LIU Z M, LI L, LI H T, LIU N, WANG H X, SHAO L W. Changes and influencing factors of crop coefficient of summer maize during the past 40 years in the North China Plain[J]. Chinese Journal of Eco-Agriculture, 2023, 31(9): 1355−1367. DOI: 10.12357/cjea.20230197
shu

Changes and influencing factors of crop coefficient of summer maize during the past 40 years in the North China Plain

  • 1.

    Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences / Key Laboratory of Agricultural Water Resources, Chinese Academy of Sciences / Hebei Key Laboratory of Agricultural Water-saving, Shijiazhuang 050022, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    State Grid Hebei Electric Power Co., Ltd. Marketing Service Center, Shijiazhuang 050035, China

Funds: The study was supported by the Hebei Innovation Group Project (D2021503001), the Hebei Key R&D Initiative Project (21326410D) and the Project of State Grid Hebei Electric Power Co., Ltd. (SGHEYX00SCJS2100077).
More Information
  • Corresponding author:

    SHAO Liwei, E-mail: liweishao@sjziam.ac.cn

  • Received Date: April 13, 2023
  • Accepted Date: May 31, 2023
  • Available Online: July 13, 2023
    Graphical Abstract
    • Abstract
  • As a key parameter for determining crop water consumption, accurate estimation of the crop coefficient (Kc) is important for irrigation scheduling. Kc is influenced by changes in production and meteorological conditions. This study analyzed Kc changes from 1980 to 2018 for summer maize under sufficient water supply based on long-term field experiments at the Luancheng Agro-Ecosystem Experimental Station of the Chinese Academy of Sciences. Using data of the three most recent seasons from 2019 to 2021 for maize under normal and water-deficit conditions, the calibration coefficient of Kc by soil water content was developed and tested. The results showed that the reference crop evapotranspiration (ETo) was stable from 1980 to 2018; however, seasonal fluctuations were observed. The actual evapotranspiration (ETc) of summer maize under adequate water supply conditions has substantially changed over recent years. The multiyear average Kc for maize was 0.91, and the interseasonal variation coefficient was 12.36%. Kc is affected by crop yield and atmospheric conditions. An increase in yield was accompanied by an increase in the ETc of summer maize. ETo was mainly affected by average wind speed and sunshine hours. Our analysis revealed that Kc is determined by ETo and ETc and is greatly affected by the ETc of summer maize. For the three most recent seasons, the difference in irrigation quantity was the main factor causing differences in Kc among the different treatments in the same season. Kc adjustment using different methods considering the soil water content could be used to estimate ETc. Incorporating the root length distribution factor into the soil water status for Kc adjustment provided a better estimate of ETc using the crop coefficient method. Therefore, Kc can be adjusted according to the root-zone soil moisture status to determine the actual crop water consumption.
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    • References (47)
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