Variability of Electrical Conductivity and Water Content in a Soil under Irrigation in the Pampean Region, Argentina
C.M. Sainato, M.S. Iseas and J.J. Márquez Molina
Event name: 24th European Meeting of Environmental and Engineering Geophysics
Session: Forensic and Archaeogeophysics A & Geophysical Surveys in Permafrost A & Geophysics in Precision Agriculture A
Publication date: 09 September 2018
Info: Extended abstract, PDF ( 1.01Mb )
Price: € 20
The complementary irrigation in the Pampean Region of Argentina may result in a deterioration of soil properties, such as sodification and salinization. It is important then to evaluate soil water content to decide the sheet of water to be applied. The aim was to study the distribution of electrical conductivity (EC) and water content, using electromagnetic soundings to evaluate the effect of irrigation on the soil. Two areas of a lot with corn were studied: one which had been irrigated since 2011 (1) and another one without irrigation (2). Volumetric water content (VWC) was measured with TDR (Time domain reflectometry) in transects along the areas. The geostatistical variograms were estimated for ECa and VWC. The range of correlation of ECa for Area 1 is approximately 8-9 m, while for Area 2 is almost 12 m. The TDR variograms showed pure nugget effect except for two transects with a range of 5 m and 7 m. The periodicity in the series of moving average of ECa and VWC is very similar at the first part of the transects. The TDR measurements of volumetric water content followed the trend of conductivity being the variability greater in the area without irrigation.