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

Zhipin AI; Yonghui YANG; Qinxue WANG; Kiril MANEVSKI; Quan WANG; Qiuli HU; Deni EER; Jiusheng WANG

doi:10.2480/agrmet.D-16-00020

Journal of Agricultural Meteorology

Online ISSN : 1881-0136
Print ISSN : 0021-8588
ISSN-L : 0021-8588

Full Paper

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

Zhipin AI, Yonghui YANG, Qinxue WANG, Kiril MANEVSKI, Quan WANG, Qiuli HU, Deni EER, Jiusheng WANG

Author information

Zhipin AI
Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan
Key Laboratory of Agricultural Water Resources, Hebei Laboratory of Agricultural Water-saving, Center for Agricultural Resources Research
Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong Road, Shijiazhuang 050021, China
University of Chinese Academy of Sciences, Beijing 100049, China
Yonghui YANG
Key Laboratory of Agricultural Water Resources, Hebei Laboratory of Agricultural Water-saving, Center for Agricultural Resources Research
Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong Road, Shijiazhuang 050021, China
Qinxue WANG
Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan
Kiril MANEVSKI
Department of Agroecology, Aarhus University, Tjele 8830, Denmark
Sino-Danish Center for Education and Research, Beijing 100190, China
Quan WANG
Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
Qiuli HU
Key Laboratory of Agricultural Water Resources, Hebei Laboratory of Agricultural Water-saving, Center for Agricultural Resources Research
Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong Road, Shijiazhuang 050021, China
University of Chinese Academy of Sciences, Beijing 100049, China
Deni EER
Center for Regional Environmental Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan
Jiusheng WANG
Soil and Water Conservation Monitoring Station, Aler Water Conservancy Bureau, Aler 843300, China

Corresponding author

ORCID

Keywords: Arid advection, Bowen ratio, Cotton growth, Eddy covariance

JOURNAL FREE ACCESS

2018 Volume 74 Issue 1 Pages 1-8

DOI https://doi.org/10.2480/agrmet.D-16-00020

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Details

Published: 2018 Received: November 14, 2016 Released on J-STAGE: January 10, 2018 Accepted: June 14, 2017 Advance online publication: October 25, 2017 Revised: -

Abstract

Crop coefficient (K_c) is a very useful and widely used variable in evapotranspiration estimation in cropland. Traditional methods in calculating K_c are based on field water balance, which is limited by long measurement interval and small study area. In addition, there is the need for K_c under new agronomy practice such as plastic mulching and drip irrigation in arid environments. This study calculated and analyzed K_c 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 K_c 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 K_c of mulched cotton for the entire growth season decreased by 16 to 39%. The largest reductions in K_c due to plastic mulch were found in the initial and developmental growth stage. K_c 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 K_c, particularly their critical values of 3.0 in LAI and 0.5 for ESW. Moreover, the results showed that irrigation significantly increased K_c, 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.

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