ORIGINAL RESEARCH
Estimating Evapotranspiration and Its
Components in Cotton Fields under Deficit
Irrigation Conditions
| 1 | State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China |
| 2 | University of Chinese Academy of Sciences, Beijing, China |
| 3 | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences
and Natural Resources Research, Chinese Academy of Sciences, Beijing, China |
CORRESPONDING AUTHOR
Submission date: 2017-09-22
Final revision date: 2017-11-18
Acceptance date: 2017-11-29
Online publication date: 2018-07-31
Publication date: 2018-11-20
Pol. J. Environ. Stud. 2019;28(1):393–405
KEYWORDS
TOPICS
ABSTRACT
Estimating field crop evapotranspiration (ETc) along with its components of soil evaporation and
crop transpiration is crucial for developing effective agricultural water-saving strategies. This study
separately estimated ETc and its components in cotton fields using a SIMDualKc dual crop coefficient
model. Data from a 2-year experiment (2010-2011) were used for model calibration and validation analysis.
The experimental plots were irrigated at 1.00, 0.85, 0.70, 0.55, and 0.45 of full irrigation amount in north
Xinjiang, China. Based on the results, SIMDualKc accurately estimated actual evapotranspiration
(ETc adj) and its components under deficit drip irrigation conditions. Cotton field transpiration accounted
for 85.4-94.3% of the ETc in the study area. Although plastic film significantly limited evaporative water
loss, the fraction of water loss was still 5.7-14.6% of irrigation water. The adopted estimation method could
lead to better understanding of where and when water loss occurs and how much water should be used
for maximal benefit. A better understanding of these factors is critical for sustainable agricultural water
management practices.
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