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Water 2018, 10(11), 1624; https://doi.org/10.3390/w10111624

Estimating the Root Water Uptake of Surface-Irrigated Apples Using Water Stable Isotopes and the Hydrus-1D Model

1
College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
Jinzhong University, Jinzhong 030600, China
*
Author to whom correspondence should be addressed.
Received: 11 October 2018 / Revised: 4 November 2018 / Accepted: 8 November 2018 / Published: 10 November 2018
(This article belongs to the Section Water Resources Management and Governance)
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Abstract

The future production of irrigated fruit orchards in the Loess Plateau of China is threatened by a shortage of freshwater. To improve water use efficiency under conditions where irrigation is limited, it is necessary to quantify the root water uptake (RWU) of apple trees. The RWU of apple trees was estimated under surface irrigation using water stable isotope technology and the Hydrus-1D model. Using the Romero-Saltos and IsoSource models, the stable isotopes of water in stems, different soil depths, and different precipitation were analyzed in a 5-year-old dwarfing apple orchard during two seasons 2016 and 2017. Hydrus-1D model was able to simulate the RWU of apple using the maximum coefficient of determination (0.9), providing a root mean square error of 0.019 cm3 cm−3 and a relative error of 2.25%. The results showed that the main depth of RWU ranged from 0–60 cm during the growth season, with the main contribution occurring in the 0–40 cm depth. These findings indicated that reducing the traditional surface irrigation depth will be important for improving the irrigation water use efficiency. View Full-Text
Keywords: water use; hydrogen and oxygen; numerical simulation; surface irrigation; apple; root water uptake water use; hydrogen and oxygen; numerical simulation; surface irrigation; apple; root water uptake
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Zheng, L.; Ma, J.; Sun, X.; Guo, X.; Cheng, Q.; Shi, X. Estimating the Root Water Uptake of Surface-Irrigated Apples Using Water Stable Isotopes and the Hydrus-1D Model. Water 2018, 10, 1624.

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