Research on Magnetic Field Strength of Electromagnetic Soil Conductivity Meter and Correlation Coefficient Between Electromagnetic Response and Soil Analysis Value on Main Reclaimed Land Polder Soil in Korea.

This paper have been planned to suggest the magnetic field of the transmitter, correlation coefficient between electromagnetic detection and lab analysis of the reclaimed land soil, and data for soil salinity mapping. The results of this study are as follows:

1. In the vertical mode, the strength of the magnetic field showed a power function (y = 8940.5x^-2.123). It was inversely proportional to the distance; i.e. it decreased by 50mG, 18mG, 10mG, 6.6mG, and 4.2mG with increasing distance in the vertical direction by 10 cm. 

2. In the horizontal mode, the strength of the magnetic field showed a power function (y = 4503.2x^-1.971). It was inversely proportional to the distance; i.e. it decreased by 35mG, 12mG, 7.8mG, 4.5mG, and 2.6mG with increasing distance in the vertical direction by 10 cm.

3. The correlation coefficient R² between the measured electromagnetic fields and analyzed electrical conductivity with the soils from Yeongsangang reclaimed land collected on June 13^th was 0.51 (topsoil) and 0.58 (subsoil). And The R² with the soils collected on October 18^th was below 0.1.

4. The correlation coefficient R² between the measured electromagnetic fields and analyzed electrical conductivity with the soils from Iweon reclaimed land collected on June 19^th was 0.64 (top soil) and 0.50 (subsoil). And The R² with the soils collected on October 18^th was 0.56 (top soil) and 0.72 (subsoil).

5. The correlation coefficient R² between the measured electromagnetic fields and analyzed electrical conductivity with the soils from Hwaong reclaimed land collected on May 31^st was below 0.1 both in the top soil and subsoil. And The R² with the soils collected on October 16^th was 0.23 (top soil) and 0.13 (subsoil).