Saturday, 1 February 2014

Mapping soil properties at the IRRI Experimental Station farm: a progress report using an EM31 survey

An IRRI Seminar

Romeo J. Cabangon
Associate Scientist, CESD

6 February 2014
1:15 - 2:15pm
Havener Auditorium, IRRI


In 2012, Terrabyte, an Australian company that conducts electromagnetic surveys, was commissioned by the IRRI Experimental Station (ES) to conduct an EM31 survey to measure the electrical conductivity (EC) in a major part of the ES area. Soil samplings (N = 20) were also conducted to relate the EC readings to clay, silt, and sand content; cation exchange capacity; and calcium, magnesium, sodium, and manganese content. A regression analysis was done to determine the relationship between these parameters and EC readings. Regression analysis showed good correlation between clay content and EC readings. However, because of the small number of samples, the team decided to take 30 additional soil samples. Soil processing and soil analysis (for clay) is ongoing.

The objective of this seminar is to introduce the initial results of the survey and to present a draft of the clay map that was developed. It also aims to seek the needs and suggestions of the research group in relation to information on soil parameters in the ES farm.   

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