Aarhus University Seal / Aarhus Universitets segl

Characteristics and influencing factors of crop coefficient for drip-irrigated cotton under plastic mulch conditions in arid environment

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

  • Zhipin Ai, Center for Regional Environmental Research, National Institute of Environmental Studies, Japan, Key Laboratory of Agricultural Water Resources, Institute of Genetics and Developmental Biology, Shijiazhuang, China, China
  • Yonghui Yang, Key Laboratory of Agricultural Water Resources, Institute of Genetics and Developmental Biology, Shijiazhuang, China, China
  • Qinxue Wang, Center for Regional Environmental Research, National Institute of Environmental Studies, Japan, China
  • Kiril Manevski
  • Quan Wang, Faculty of Agriculture, Shizuoka University, China
  • Qiuli Hu, Key Laboratory of Agricultural Water Resources, Institute of Genetics and Developmental Biology, Shijiazhuang, China, China
  • Deni Eer, Center for Regional Environmental Research, National Institute of Environmental Studies, Japan, Japan
  • Jiusheng Wang, Soil and Water Conservation Monitoring Station, Aler Water Conservancy Bureau, China
Crop coefficient (Kc) is a very useful and widely used variable in evapotranspiration estimation in cropland. Traditional methods in calculating Kc are based on field water balance, which is limited by long measurement interval and small study area. In addition, there is the need for Kc under new agronomy practice such as plastic mulching and drip irrigation in arid environments. This study calculated and analyzed Kc of a drip-irrigated and plastic-mulched cotton field in Aksu Oasis of the arid Tarim River Basin, China, and its relationships with several crop-, soil- and management variables such as relative growth days (RGD), leaf area index (LAI), extractable soil water (ESW), and irrigation, based on two years’ observations. The results showed that daily Kc varied within the range of 0.08‒1.28, with an average of 0.54 for the entire cotton growth season, in 2013 and 2014. Compared to non-mulched condition already published, the Kc of mulched cotton for the entire growth season decreased by 16 to 39%. The largest reductions in Kc due to plastic mulch were found in the initial and developmental growth stage. Kc could be calculated by a third-degree polynomial model in relation to RGD, which was satisfactorily validated and can be used in other studies under the same or similar pedo-climatic and management conditions. Cotton LAI and ESW were found to be important factors influencing Kc, particularly their critical values of 3.0 in LAI and 0.5 for ESW. Moreover, the results showed that irrigation significantly increased Kc, i.e., 29% on average, partly due to arid advection. This study provided up-to-date and detailed information on cotton crop coefficient under plastic mulching and drip irrigation conditions in arid environment, and it is useful for improved management of agricultural water resources.
Original languageEnglish
JournalJournal of Agricultural Meterology
Volume74
Issue1
Pages (from-to)1-8
ISSN1881-0136
DOIs
Publication statusPublished - 2018

    Research areas

  • arid advection, bowen ratio, cotton growth, Eddy covariance

See relations at Aarhus University Citationformats

Activities

Projects

ID: 114049066