Performance analysis of dielectric soil moisture sensor I.A., Wang M., Ren Y., Shi Q., Malik M.H., Tao S., Cai Q., Gao W. (2019): Performance analysis of dielectric soil moisture sensor. Soil & Water Res., 14: 195-199.
download PDF

Soil moisture (SM) varies greatly in the soil profile. We developed a low-cost sensor for SM monitoring at three vertical depths. The sensor function was based on dielectric theory to monitor SM. Three linear calibration models were established using different soils. The sensor for each depth showed acceptable statistics of validations. The linear fit coefficient of determination (R2) ranged from 0.95 to 0.99. Root mean square error (RMSE) ranged from 1.35 to 4.30. The sensor performed consistently for at least 4 months, and is suitable for continuous monitoring of in situ SM and irrigation scheduling.

Cheng Q., Sun Y., Qin Y., Xue X., Cai X., Sheng W., Zhao Y. (2013): In situ measuring soil ice content with a combined use of dielectric tube sensor and neutron moisture meter in a common access tube. Agricultural and Forest Meteorology, 171–172: 249–255.
Chow L., Xing Z., Rees H.W., Meng F., Monteith J., Stevens L. (2009): Field performance of nine soil water content sensors on a sandy loam soil in new brunswick, maritime region, Canada. Sensors, 9: 9398–9413.
Evett S., Heng L., Moutonnet P., Nguyen M. (2008): Field Estimation of Soil Water Content: A Practical Guide to Methods, Instrumentation, and Sensor Technology. Vienna, IAEA.
Irmak S., Irmak A. (2005): Performance of frequency-domain reflectometer, capacitance, and psuedo-transit time-based soil water content probes in four coarse-textured soils. Applied Engineering in Agriculture, 21: 999–1008.
Mittelbach H., Lehner I., Seneviratne S.I. (2012): Comparison of four soil moisture sensor types under field conditions in Switzerland. Journal of Hydrology, 430–431: 39–49.
Penna D., Brocca L., Borga M., Dalla Fontana G.(2013): Soil moisture temporal stability at different depths on two alpine hillslopes during wet and dry periods. Journal of Hydrology, 477: 55–71.
Soulis K.X., Elmaloglou S., Dercas N. (2015): Investigating the effects of soil moisture sensors positioning and accuracy on soil moisture based drip irrigation scheduling systems. Agricultural Water Management, 148: 258–268.
Stacheder M., Koeniger F., Schuhmann R. (2009): New dielectric sensors and sensing techniques for soil and snow moisture measurements. Sensors, 9: 2951–2967.
Stangl R., Buchan G.D., Loiskandl W. (2009): Field use and calibration of a TDR-based probe for monitoring water content in a high-clay landslide soil in Austria. Geoderma, 150: 23–31.
Topp G.C. (2003). State of the art of measuring soil water content. Hydrological Processes, 17: 2993–2996.
Topp G.C., Davis J., Annan A.P. (1980): Electromagnetic determination of soil water content: Measurements in coaxial transmission lines. Water Resources Research, 16: 574–582.
download PDF

© 2020 Czech Academy of Agricultural Sciences