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Water 2018, 10(9), 1180; https://doi.org/10.3390/w10091180

Optimal Irrigation Mode and Spatio-Temporal Variability Characteristics of Soil Moisture Content in Different Growth Stages of Winter Wheat

1
S&T Information Institute of Shandong Academy of Agricultural Sciences, Shandong Academy of Agricultural Sciences, Jinan 250100, China
2
Agronomy College of Shandong University, Shandong University, Jinan 250100, China
3
Crop Production Systems Research Unit, Agricultural Research Service, United States Department of Agriculture, Stoneville, MS 38776, USA
4
Shandong Province Land Surveying and Planning Institute, Jinan 250100, China
*
Author to whom correspondence should be addressed.
Received: 16 July 2018 / Revised: 29 August 2018 / Accepted: 30 August 2018 / Published: 5 September 2018
(This article belongs to the Section Water Use and Scarcity)
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Abstract

To advance site-specific management of soil volumetric moisture content (VMC), this study analyzed the spatio-temporal evolution characteristics of soil VMC using the method of sequential Gaussian simulation (SGS) during the different growth stages of winter wheat. This was compared with data measured by time domain reflectometry (TDR) which is a well-established electromagnetic technique to measure soil VMC. The spatial autocorrelation coefficient of VMC indicated the strongest clustering of VMC in the tillering stage, and the least clustering of VMC in the harvest stage. A threshold of VMC in topsoil in the jointing stage of winter wheat was put forward. This threshold is 26, signifying that at a lower value, irrigation should be performed and irrigation efficiencies can be improved. Stable and sub-stable areas in the spatial variability maps of VMC were identified in the winter wheat jointing stage. Furthermore, the optimal irrigation stage was the early jointing stage, and irrigation was performed once as a guide. A loose-couple spatial model was constructed using the VMC in topsoil and the volume of water for irrigation. The VMC in the jointing stage of winter wheat was linked with efficient and water-saving irrigation. View Full-Text
Keywords: irrigation mode; soil volumetric moisture content; sequential Gaussian simulation; winter wheat; growth stages irrigation mode; soil volumetric moisture content; sequential Gaussian simulation; winter wheat; growth stages
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Yang, Y.; Huang, Y.; Zhang, Y.; Tong, X. Optimal Irrigation Mode and Spatio-Temporal Variability Characteristics of Soil Moisture Content in Different Growth Stages of Winter Wheat. Water 2018, 10, 1180.

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