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Focus Topic: Soil Moisture Sensor Development and Calibration

Soil moisture is a key property controlling water, energy, and mass transport processes in the vadose zone. Progress in understanding these processes is intermittently linked with the development of sensor technologies. This focus topic features articles that investigate new soil moisture sensor development,  sensor calibration, comparison of sensors, new and improved calibration methods, and technology development. It presents original, basic, and applied papers on development and advancement of soil moisture measurement at techniques at lab, field, and spatial scales and across different soils and salinity gradients.
Zhuangji Wang, Robert Schwartz, Yuki Kojima, Yan Chen and Robert Horton
Adaptive waveform interpretation with Gaussian filtering (AWIGF) and second-order bounded mean oscillation Z2(u,t,r) are time domain reflectometry (TDR) analysis models. The AWIGF was originally desig...more
Binayak P. Mohanty, Michael H. Cosh, Venkat Lakshmi and Carsten Montzka
This is an update to the special section “Remote Sensing for Vadose Zone Hydrology—A Synthesis from the Vantage Point” [Vadose Zone Journal 12(3)]. Satellites (e.g., Soil Moisture Active Passive...more
Min Li, Bing Cheng Si, Wei Hu and Miles Dyck
The estimation of soil thermal conductivity (λ) using the single-probe heat pulse (SPHP) method is well known, but estimation of soil water content (θ) using the SPHP is poorly understood. In this s...more
Felix Greifeneder, Claudia Notarnicola, Giacomo Bertoldi, Georg Niedrist and Wolfgang Wagner
Given the high spatial variability of soil moisture content (SMC), direct comparison and integration of observations from different sources and measurement scales is becoming a major challenge. We hav...more
Ali Fares, Mohammad Safeeq, Ripendra Awal, Samira Fares and Ahmet Dogan
Reliable and accurate monitoring of soil water content (θ) across the landscape is indispensable for many water resources applications. Capacitance-based in situ soil water content measuring devices...more
Ryan D. Stewart, David E. Rupp, Majdi R. Abou Najm and John S. Selker
Many clayey soils shrink as they dry, causing a shift of porosity from inside to outside the soil aggregates and leading to the formation of shrinkage cracks and/or surface subsidence. During swe...more
Agnieszka Szypłowska, Andrzej Wilczek, Marcin Kafarski and Wojciech Skierucha
The complex dielectric permittivity (CDP) of soils is used in moisture and salinity measurements. We have developed a CDP spectra determination method based on Fourier analysis of electrical signals r...more
Tadaomi Saito, Hiroshi Yasuda, Miyu Sakurai, Kumud Acharya, Sachiko Sueki, Koji Inosako, Kiyotsugu Yoda, Haruyuki Fujimaki, Mohamed A.M. Abd Elbasit, Ahmed M. Eldoma and Hiroshi Nawata
Dielectric soil moisture sensors have the potential for nondestructive and real-time monitoring of the stem water content (θst) of living trees. This study was conducted to investigate the water use...more
Zhuangji Wang, Yili Lu, Yuki Kojima, Songtao Lu, Meng Zhang, Yan Chen and Robert Horton
Tangent line (TL) methods and the second-order bounded mean oscillation (BMO) method have been proposed for determining the reflection positions of time domain reflectometry (TDR) waveforms, especiall...more
Hanna Ouaknin, Yael Meyouhas, Noam Weisbrod and Alex Furman
Time domain reflectometry (TDR) is a simple and popular method for measuring soil water content. The TDR measures a weighted average of the dielectric permittivity of the soil along and around a probe...more