Assessment of soil and soil-water salinity in Ben Tre province by electromagnetic technology

Le Ngoc Thanh; Nguyen Quang Dung; Luu Hai Tung

doi:10.15625/1859-3097/19/4/14902

Author affiliations

Authors

Le Ngoc Thanh Ho Chi Minh city Institute of Resources Geography, VAST, Vietnam
Nguyen Quang Dung Ho Chi Minh city Institute of Resources Geography, VAST, Vietnam
Luu Hai Tung Ho Chi Minh city Institute of Resources Geography, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/19/4/14902

Keywords:

Soil salinity, soil-water salinity, electromagnetic induction, EM31-MK2 instrument, correlation, regression, distribution map.

Abstract

Assessment of soil and soil-water salinity is essential in agricultural production, therefore it is necessary to find out the non-costly, effective, rapid and reliable integrated methodology for this purpose. The paper presents the results of using the electromagnetic induction instrument EM31-MK2Ô in combination with collecting and analyzing soil and soil-water samples, and applying GIS and geostatistical techniques to assess the current status of soil and soil-water salinity in Ben Tre province. Apparent soil electrical conductivity EC_a measured from ground surface to 6 m in depth increases from inland to the sea in northwest - southeast direction; EC_a is closely related to topsoil salinity to 30 cm deep and to soil-water salinity at depth of 10–100 cm. Current status of soil and soil-water salinity in 2018 was assessed with a 4-fold increase in information, from 16 km²/data point to 4 km²/data point. Consequently four maps were established, consisting of electrical conductivity EC_e and total solube salt TSS distributions of soil; electrical conductivity σ_w and total dissolved solid TDS distributions of soil-water.

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